Assessment of Effects of Reductions of Lateral Stiffness along Height on Buildings Modeled as Elastic Cantilever Shear Beams

A simplified model useful for assessing economic losses due to moderate seismicity events in urban areas has been developed by studying the behavior of buildings before yielding their structural system, allowing for nonuniform stiffness along their height. In particular, buildings are modeled as cantilever shear beams with uniform mass and parabolic reduction of lateral stiffness. This particular stiffness distribution is relevant, as it could be expected to occur in buildings where earthquake action is a critical structural design criterion. The equation of motion governing the dynamic behavior of the proposed model is solved analytically, finding mode shapes in terms of first and second zero-order Legendre functions. The solution is verified by comparing it with results obtained from fine mesh finite element models. The effect of reducing the lateral stiffness is then studied in the first five modes of vibration. Results include modal periods, mode shapes, modal participation factors, and derivatives of mode shapes. In general, it is found that effects of reduction of lateral stiffness in mode shapes are moderate when the lateral stiffness in the free end is smaller than about seventy percent of the lateral stiffness at the fixed end, but become significant for larger reductions. Effects are particularly important for the derivative of the mode shapes, which could play a significant role in estimating interstory drift demands in buildings. Model usefulness is showcased by analyzing a test case where both acceleration and drift demands are assessed by considering uniform beams and beams with parabolic stiffness variation, finding notable improvements by considering the latter.     

谈谈电容器串联难点之突破

本文从实践和理论的角度详细讨论了电容器串联电路的特点,特别对电容器串联电路的酎压值计算等难点问题进行较为深刻的探讨和摸索。     

A Procedure to Generate Thiessen Polygons

An algorithm to generate Thiessen diagrams for a set of n points defined in the plane is presented. First, existing proximal polygon computation procedures are reviewed and terms are defined. The algorithm developed here uses a rectangular window within which the Thiessen diagram is defined. The computation of Thiessen polygons uses an iterative walking process whereby the processing starts at the lower left corner of the diagram and proceeds toward the right top corner. The use of a sorted point sequence and dynamical core allocation provide for efficient processing. The presentation is concluded by the discussion of an implementation of the algorithm in a FORTRAN program.     

ADDITIVE-INTERACTION MODELS OF SPATIAL AGGLOMERATION*

A wide variety of existing models of spatial agglomeration postulate additive-interaction effects among agents. In this paper, a synthesis of such models is achieved by establishing certain mathematical equivalences between them. In particular, it is shown that Rockafellar's conjugacy theory of concave functions yields a symmetric one-to-one correspondence between three classes of existing models, here designated as spatial-accessibility models, endogenous-contact models, and fixed-contact models. These correspondences not only allow the transference of results between models, but also suggest new economic interpretations of each model in terms of its conjugate model. A series of examples are drawn from the literature to illustrate these results.     

A Hybrid Framework for Space–Time Modeling of Environmental Data. 环境数据时空建模的混合框架

The space–time autoregressive integrated moving average (STARIMA) model family provides useful tools for modeling space–time processes that exhibit stationarity (or near stationarity) in space and time. However, a more general method for routine use and efficient computation is needed to model the nonlinearities and nonstationarities of environmental space–time series. This article presents a hybrid framework combining machine learning and statistical methods to address this issue. It uses an artificial neural network (ANN) to extract global deterministic (nonlinear) space–time trends and a STARIMA model to extract local stochastic space–time variations in data. A four‐stage procedure is proposed for analyzing and modeling space–time series. The proposed framework and procedures are applied to forecast annual average temperature at 137 national meteorological stations in China. The results demonstrate that the hybrid framework achieves better forecasting accuracy than the STARIMA model alone. This finding suggests that the combination of machine learning and statistical methods provides a very powerful tool for analyzing and modeling space–time series of environmental data that have strong spatial nonlinear and nonstationary components.     

The industrial district: A stage of a diffuse industrialization process—the case of Roanne

The industrial district is an important element of the theoretical debates concerning the appearance of original features of regional development in Europe. Issuing from Marshallion theory, this concept was ‘reinvented’ in the late 1970s in order to interpret a series of ‘regional success stories’ of industrial development that occurred in middle Italy. Thus, for some economists and geographers, the industrial district has become a new ‘standard’ of regional development, appearing as an autonomous integrated system, whose functions are based on the principle of ‘automation’. This system represents an optimal structure in terms of economic efficiency and resource allocation, and owns its proper mechanisms of reproduction related to specific territorial regulations. A crisis for such a system can only be related to exogenous factors. Rejecting this static vision of economic structures, which reintroduces the ‘growth/crisis’ divide in the analysis of economic development, it seems necessary to promote a more dynamic approach in terms of ‘change through continuity’. This approach was initially developed by some Italian authors who tried to analyze the original features of regional development in the Third Italy in terms of ‘industrialization without fracture’. This approach does not deny the existence of industrial districts, but refuses to accept that they are static: districts can evolve, change, develop . . . Thus, they appear as a particular stage of development in a diffuse industrialization process. Their evolution is no longer simply related to exogenous variables but also to endogenous ones; and this evolution does not necessarily lead to an implosion or a complete transformation of space but can also lead, through the continuity of the industrial district's mechanisms, to a post‐district organizational configuration.     

METROPOLITAN AGGLOMERATION AND SECTORAL AGGREGATION*

ABSTRACT. This paper proposes a procedure with which sectoral production functions can be aggregated to metropolitan production functions in the presence of external economies of scale. The procedure specifies the production functions as part of general equilibrium models. Consistency of a one-sector and a two-sector general equilibrium model is defined in terms of equality of the distribution of a nation's population over its metropolitan areas in autarky.     

青海藏族地区信访制度的回顾与展望

信访制度是富有中国特色的纠纷解决机制之一。新中国成立60年来,信访制度的设立对于维护青海藏族地区的社会稳定起了积极的作用。但是在其运行过程中也遇到了一些问题。如何发挥信访制度在党和政府沟通藏族群众方面的历史作用,需要结合当地实际进行一系列制度创新与改革。     

Capacity Evaluation of Typical Stud-Track Screw Connections in Nonstructural Walls

A series of component-level experiments have been conducted aiming to evaluate the force and displacement capacities of typical stud-track screw connections (STCs) in steel-framed partition walls. The variables considered in these experiments included screw-edge distances, loading protocols (monotonic or cyclic), and stud and track thicknesses. The experimental data was then utilized to develop different capacity fragility curves for STCs in terms of displacements. A series of analytical STC hinge models were also proposed and validated using this data. The hinge models can be adopted in future studies to develop a comprehensive analytical model for a typical partition wall assembly.     

Regional Out-Migration Rates and Migration Histories: A Longitudinal Analysis

A longitudinal approach to migration behavior makes it possible to identify a sufficient condition for positive associations between rates of in-migration and rates of out-migration in the same regions. The longitudinal approach centers on the intervals of time that individuals spend in a region, and these intervals can be analyzed in terms of probability distributions or the equivalent hazard functions or survivor functions. Differences in the distributions of these intervals between subpopulations whose residence in a region begins with in-migration and subpopulations whose residence begins with other events are sufficient for temporal variations in rates of in-migration to produce variations in out-migration rates in subsequent periods of time. Tests for such differences are performed using data from the National Longitudinal Survey of Youth.     

The legacy of the Wernicke-Lichtheim model

Wernicke established an integrated model of the relation between higher cognitive functions and neurophysiological structure of the human brain in 1874. The previous Bouillaud/Broca view envisaged a mosiac map of centres for specific functions, each of which had no clear inter-relation with other centres or with input/output pathways, and with no theoretical explanation of how each centre operated in relation to more basic neural elements. Wernicke's model overcame these objections, and, with Lichtheim's systematization in 1885, the "Wernicke-Lichtheim model" became the standard neuropsychological theory. In this model, each normal higher function is explained in terms of an underlying neural pathway that includes the input/output systems, related functions employ portions of the pathways used for other functions, pathological syndromes are explained by reference to where in the pathway damage occurred, and previously unobserved pathological syndromes can be predicted. Development of the model at the hands of Lissauer, Dejerine, Liepmann, Geschwind, Heilman, and Ellis and Young is traced.     

试析郑玄《周礼注》中的“古文”与“故书”

本文通过考察郑玄《周礼注》中使用“古文”和“故书”类术语的全部用例,总结了这两个术语的具体使用形式,区分了二者的职能。认为前者应当是指比郑玄所见古文经《周礼》文字更早的文字写法,属于历时沟通字际关系术语;后者则是郑玄使用的沟通《周礼》不同版本用字的术语。同时文章还分析了两个术语各自的来源。     

The nineteenth century Gazette Corn Returns from East Anglian markets

The official Corn Returns for individual market towns, published weekly in the London Gazette, present an opportunity for examining the activity of English country grain markets during the nineteenth century. This paper describes this currently neglected source and considers its credibility and value, using records for East Anglia as a case study.The paper is set against an account of the methods employed in collecting the Returns and a discussion of problems of reliability particularly in the quantity series. The annual quantity series for wheat and barley from 1820 to 1864 for nine East Anglian markets are then examined using methods of time series factor analysis. It is argued that the similarities in these series demonstrate a high degree of consistency and therefore credibility.The general fluctuations in wheat and barley sales in these East Anglian markets are related to production, but differences between the various markets are analysed in terms of a hypothesis that sets the farmers' decisions as to where and to whom to sell the grain within the context of the general farm economy, relating them to the balance between the sale and carriage price for grain on the one hand and the need for and cost of farm inputs on the other. The paper ends with suggestions of other areas of research where these Corn Returns could prove valuable.     

河南鹤壁古代陶窑遗址浅析

自 198 8年始 ,在配合鹤壁城市建设中 ,先后发现了一批不同年代的古代陶窑遗址 ,对认识古代中原地区的社会经济和古代鹤壁地区的制陶、制瓷等手工业的发展 ,有着极为重要的意义     

ANTI-RACISM IN ‘WHITE’ AREAS: THE EXAMPLE OF TYNESIDE*

This paper discusses the development of anti-racist consciousness amongst educationalists in a predominantly white location in Britain (Tyneside). The notion that the emergence of anti-racism in ‘white’ areas can be adequately conceptualized in terms of anti-racism's move from ‘multiracial’ locations is rejected. It is argued that the development of anti-racist attitudes amongst Tyneside educationalists needs to be examined in terms of their experiences of working and living in the area. Through the use of a series of interviews it is shown how this group has reformulated anti-racism in the light of local social conditions.     

‘Europe’: What Kind of Idea?

Salman Rushdie posed the question, “What kind of idea are you?” We have borrowed his provoking question and held it up to ‘Europe.’ In this article, we suggest that ‘Europe’ cannot be primarily identified or located in terms of geographies, histories, religions, cultures or values, and that attempts to do so diminish the idea of ‘Europe.’ We also contest the vision of ‘Europe’ as a series of concentric circles emanating from Brussels and suggest that this conception indefensibly marginalizes vital portions of ‘Europe.’ We propose that, while the European Union (EU) is attempting to define core concepts of ‘Europe,’ ‘Europe's’ frontiers and borders (wherever or whatever they may be, inside or outside ‘Europe’) are actively constructing, contesting and resisting ‘Europe.’ The peripheries and perimeters are no less important than the core. On the contrary, they give substance to the idea of ‘Europe.’ Finally, we argue that ‘Europe’ can best be understood as a non-teleological construct, a narrative à la Roland Barthes. Inspired by Barthes, we propose a ‘Europe’ Theory of Classification operating at the levels of functions, actions and narration.     

Biopower,Life and Left Politics

Abstract: The terms biopower and biopolitics have been deployed in widely varying ways in recent critical political analyses. This essay seeks to rescue from the welter of its deployments a general understanding of biopower potentially useful to left political projects. First, recent iterations of the concept of biopower are surveyed. In the main body of the paper, a series of interventions in recent critical debates are used to trace out a critical re‐mapping of the concept of “life” that names the ends of biopower. Biopolitically relevant life is reconsidered in terms of its proper geographical scope, its gender, racial and ethnic specificities, its distinguishing vital qualities, and its relation to temporality (particularly the future). Through this exercise the notion of biopower is redefined so as to provide potential “docking points” for Marxist, feminist and green discourses, and conceptual resources for left struggles against global injustice.     

The System of Urban Places of the Donets Territorial-Production Complex

The system of urban places of the Donets Basin is analyzed in terms of economic functions. Seven types are distinguished ranging from small, narrowly specialized coal-mining settlements to major cities with a polyfunctional structure of industry. Four charts that accompany the original article have been dropped in the translation because of reproduction problems.     

‘The land we have we must hold’: soil erosion and soil conservation in late nineteenth- and twentieth-century New Zealand

Most accounts of the emergence of soil conservation practices in New Zealand have been written by individuals centrally involved in the area. These accounts typically give prominence to the motives and actions of individuals. This paper offers a contrasting viewpoint by discussing developments in soil conservation in terms of some of the elemental functions of states. This perspective reveals how soil conservation in New Zealand emerged out of a ‘war against nature’ linked to colonial land settlement, how in the twentieth century it performed both a social welfare and economic management function, and less obviously how soil conservation was interpreted in terms of national identity.