Neighbour regions as the source of new industries

The development of new industries demands access to local capabilities. Little attention has yet been paid to the role of spillovers from neighbour regions for industrial diversification, nor has the role of network linkages between neighbour regions been investigated. As the spread of capabilities has a strong geographical bias, we expect regions to develop new industries in which their neighbour regions are specialized. To test this hypothesis, we analyse the development of new industries in US states during the period 2000–2012. We show that a US state has a higher probability of developing a comparative advantage in a new industry if a neighbour state is specialized in that industry. We also show that neighbour US states have more similar export structures. This export similarity seems to be explained by higher social connectivity between neighbour states, as embodied in their bilateral migration patterns.     

A socio-spatial analysis of neighbour complaints using large-scale administrative data: The case in Brisbane,Australia

Large-scale administrative data collected by municipal government are increasingly being used by researchers to better understand a host of urban phenomena and the way they are patterned over space and time. In this paper, council data are used to explore the incidence of complaints about neighbours across urban neighbourhoods using a GIS-based spatial approach. Through an exploratory and a confirmatory factor analysis of the spatially extracted neighbour complaints data, we identify four types of neighbour complaints – animal related; building construction; property management issues; and health and visual amenity issues – that categorise neighbour problems. GIS technologies are applied to map the spatial distribution of each complaint type across the 218 suburbs, resulting in distinct patterns of neighbour complaints in Brisbane suburbs. Our research demonstrates the utility of naturally occurring administrative data as a means of learning more about the social life of urban areas.     

Higher order interactions in magneto-inductive waveguides

The properties of periodic chains of magnetically coupled L–C resonators supporting magneto-inductive (MI) waves are examined in the case when non-nearest neighbour interactions are significant. The variation of the coupling coefficient with separation is measured using resonant elements based on printed circuit board inductors and surface mount capacitors, and used to predict the S-parameters and dispersion characteristics of magnetoinductive waveguides. Good agreement with experimental measurements is obtained when higher order interactions are included. The significance of non-nearest neighbour interactions in more general MI wave devices is then highlighted in an example problem involving reflection from a waveguide discontinuity, and the influence of higher order evanescent waves is discussed.     

Thrust SSC: Britain challenges the world. 1

September 1997 sees a unique competition shaping up for a showdown in the Black Rock Desert in Nevada as Britain's Andy Green faces America's Craig Breedlove in a bid to be the first man to go supersonic in a land vehicle. This contest is more than just a test of speed as the rival designs represent opposing technical, financial and organisational solutions to an immense challenge. The first article in this two-part series looks at the technical aspects and the design of Britain's contender-Thrust SSC. The aerodynamic fundamentals, the Rolls Royce Spey 205 jet engines used to power the vehicle, vehicle layout, and modelling and testing are discussed     

基于Voronoi图的新型几何插值及其与传统代数插值方法的比较

基于Voronoi图的自然邻居插值是自然单元法的数学基础，也是一种新型的几何插值方法，具有与其他常用传统插值不同的构造方法，并表现出一定的优越性。介绍基于自然邻居插值关系的Sibson插值和non-Sibsonian插值，并与有限元法和无单元法所用的插值方法在插值方案、网格特性、计算工作量等方面进行了比较分析。     

The BEQUEST network: towards sustainable urban development

This paper by Steve Curwell, Andy Hamilton and Ian Cooper reports on the work of BEQUEST (Building Environmental Quality Assessment for Sustainability through Time), a network funded in October 1997 by the EU Environment and Climate Programme.1 The main objective of this group is to lay the foundations of a common understanding of sustainable urban development through a multi-disciplinary network of representatives of all actors involved in the provision, use and maintenance of the built environment. An integrated approach to built environment quality assessment is to be developed which will help to reduce the environmental uncertainty facing decision makers in the development and infrastructure industries.     

二维耦合热弹性动力学问题的无网格自然邻接点Petrov-Galerkin法

为了更有效地求解二维耦合热弹性动力学问题,对无网格自然邻接点Petrov-Galerkin法在此类问题中的应用进行了研究,并发展了相应的计算方法。该方法建立试函数时可以只依赖于一组离散的节点,有效地避免了复杂的网格划分和网格畸变的影响。相对于常用的移动最小二乘而言,自然邻接点插值不涉及复杂的矩阵求逆运算,更不需要任何人为参数。由于运动方程和瞬态热传导方程相互影响,这些方程必须联立求解。采用Newmark法求解空间离散后得到的二阶常微分方程组,进而可直接获得温度场和位移场的数值结果。     

The pastoral and the wilderness in early Canada

The Canadian conservative ideology of an ordered controlled environment distinguished it from its revolutionary American neighbour. The ideology frequently involved Pastoral attitudes to nature. Only occasionally before the twentieth century did Canadian writers reveal negative views of their country's terrain.     

Magneto-inductive conductivity sensor

Multi-element inductive coil systems are used to measure locally resolved conductivity profile. Usually such sensors rely on the separate interrogation of each coil. In addition, the coils must generally be magnetically decoupled for accurate signal processing. Here we demonstrate a metamaterial conductivity sensor that uses broadband interrogation of a line of coupled resonators. No decoupling is needed, which allows a transmission measurement to be carried out. The resonant elements of the metamaterial are coupled with each other and their neighbourhood which affects their quality factor. We derive analytically an algorithm to extract the local perturbation in each element from the modal measurement. We investigate numerically the performance of the sensor and derive an optimal configuration in terms of nearest neighbour coupling and the initial non-uniformity. Finally we implement a four-element magneto inductive conductivity sensor and show that a conductive perturbation along the line can be accurately reconstructed. Generalisation to higher number of elements is also discussed.     

黄文熙先生的主要学术成就——纪念黄文熙先生诞生100周年

黄文熙先生在结构工程和岩土工程方面都有创新性的研究成果。他提出的拱坝计算的格栅法,是在电子计算机出现以前的结构离散计算方法,也是有限元法计算的先驱;他提出了可以反映土的应力路径的三维地基沉降计算方法;他也是国内外公认的动三轴试验的首创者;他提出了具有突出特色的清华弹塑性模型,大大推动了我国土的本构模型研究的发展。