现代谱估计在窄带天线测试中的应用

在暗室中对窄带天线进行测量时,由于间接时域方法的测试带宽不足而无法有效地去除多径信号所产生的干扰,文中提出将现代频谱估计技术应用于此类天线的测试。以最大熵为约束条件,利用现代谱估计中的Burg算法求解接收到频域信号的AR模型参数,并对其进行频谱外推。从而在频域拓宽信号的测试带宽,在时域提高信号的分辨率,并运用间接时域测量技术精确加载时域门,达到去除多径干扰的目的。仿真和实测都验证了该方法的有效性及可靠性。     

非静态混合细分法

提出了一种含参数b的非静态Binary混合细分法,当参数取0、1时,分别对应已有的非静态四点C1插值细分法及C-B样条细分法。用渐进等价定理证明了对任意(0,1]区间的参数其极限曲线为C2连续的。从理论上证明了细分法对特殊函数的再生性,及其对圆和椭圆等特殊曲线的再生性,并通过实验对比说明了对任意的[0,1]区间的参数,该细分法都能再生圆和椭圆等特殊曲线,而与其渐进等价的静态细分法则不具备该性质。将该细分法推广为含局部控制参数的广义混合细分法,从而可以达到局部调整极限曲线的目的。     

The Oslo transport packages 1–3: success by local initiatives

Queues, traffic jam and chaos characterised Oslo in the 1980s. The region Oslo/Akershus had for decades in vain been waiting for national finance in order to solve the problem. A local transport package based on road charging gave the funding for building roads. The region grew by 22% in population in the period 2000–2012. The road traffic has increased by 6% and the public transport by 38% in Oslo, a massive success. Sixty percent of the funds are now invested in public transport. Public attitudes are rather positive. There are still queues, but they are reduced. The local firm ‘Fjellinjen’ owned by Oslo and Akershus do not pay dividends and has reduced administrative and running costs to 10%.     

Is the ability of politicians to act as representatives between elections hampered in systems inspired by NPM?

In this article, I explore and analyse how the application of systems inspired by New (Normal) Public Management affects the capacity of politicians to act on behalf of the people. The aim is to acquire new knowledge about how output-based financial and performance measurement systems affect the form and content of deliberative processes between elections. The analysis is based on an extensive empirical process, both backwards and forwards in time, tracing analysis of a critical event that occurred within education policy in a Swedish municipality. One main hypothesis generated is that NPM-inspired systems have a negative effect on deliberations between elections in ways that generate lock-in effects that hamper the ability of politicians to act as representatives between elections.     

The necessity of sustainability

The objective of this study was to obtain empirical data on how well various contextual urban design principles work and thus assist in formulating evidence‐based planning. This paper reports findings from three studies, covering 51 environments and 164 participants, on how strongly these factors were related to visual appeal of a whole block of houses: (a) individual style of an infill house; (b) number of matches between an infill house and the houses in their contexts; (c) the diversity of the existing context; (d) proximity of an infill house to other houses; and (e) compatibility of the infill house with respect to the houses in their contexts. The strongest effect was found for the individual style of a new building, followed by the equivalence of judgments of compatibility and visual appeal, by the number of other houses the infill house matched, by existing visual diversity, and by distance. Policy guidance is provided for effects sufficiently strong to support evidence‐based decision making and withheld for effects for which the scientific support is currently insufficient.     

梁山印象——梁山汽车客运中心方案设计

在当今全球化的背景下,建筑的地域化表达是建筑师们的普遍追求。汽车客运站作为城市的重要节点,在满足交通中转的功能外,还是表达地域文化、展现城市风采的重要门户。本文结合梁山汽车客运中心的设计分析,从文化引入,总体布局,流线分析、景观营造等方面阐述了基于特定城市文化脉络的设计思路。     

基于脆性理论的城中村改造系统风险规避策略研究——以西安市四个城中村为例

城中村改造作为新型城镇化进程中的关键环节,为社会稳定、城市发展、经济繁荣提供了保障。由于改造过程涉及众多利益主体且各主体间呈非合作博弈关系,在实际推进过程中常由于利益冲突而引发社会问题。本文将城中村改造视为一个复杂系统,从脆性熵视角看待城中村改造系统,分析城中村改造系统脆性演化机理,是对复杂系统脆性理论的补充和完善;探讨城中村改造系统脆性风险规避策略,提出规划建议,以期构建稳定、高效的城中村改造系统,具有理论和现实意义。     

关于某大厦办公楼超限结构设计的探讨

本文介绍了某大厦建筑结构整体设计过程,对建筑结构的分析和方法的采用都进行了详细阐述。本工程中再次研究了超限高层建筑设计的抗震性能,通过计算机软件的应用、概念设计、局部转换等手段,保证建筑基本性能和提高建筑抗震性能,给以后的超限高层建筑结构设计提供了一个案例参考。     

试论园林景观中本土文化元素的应用——以松江上林苑为例

本文以上海松江上林苑的建筑和景观特点为主要案例,探讨上海本土文化元素在园林景观中具体应用,并总结出一些具体的景观设计注意点。     

A new multi‐focus image fusion algorithm based on BEMD and improved local energy

A multi‐focus image fusion method, which is based on bidimensional empirical mode decomposition (BEMD) and improved local energy algorithm, is presented in this paper. First, the source image is decomposed by BEMD. Then maximum criterion combined with weighted average fusion rule based on local energy is applied to bidimensional intrinsic mode function components of the corresponding frequency segment. If the phase of the bidimensional intrinsic mode function coefficients decomposed by BEMD on two source images is the same, the local energy maximum criterion is used in the frequency coefficients of the fused image; else, if the corresponding phase is opposite, bidimensional intrinsic mode function coefficients of the fused image is determined by a weighted average method based on local energy. Finally, the fusion result is obtained by the inverse BEMD transformation on the fusion coefficient. Simulation shows that the proposed algorithm significantly outperforms traditional methods such as the maximum criterion, weighted average, and wavelet fusion rules. © 2015 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.