Capitalised nonmarket benefits of multifunctional water-sensitive urban infrastructure: A case of living streams

Living streams are an important element of decentralised stormwater management solutions. They are actively promoted due to their ability to generate multiple ecosystem services, including water quality improvement, biodiversity protection and aesthetics. However, a lack of monetised values of ecosystem services of living stream projects makes it difficult to assess the net benefits of investing in such projects. This study uses the hedonic pricing method to estimate the capitalised amenity values of living streams and other public open spaces (POS) in housing and lot markets for the first time. The study area includes two newly greenfield-developed suburbs in the Perth metropolitan area. We find the positive impact of living streams and other POS on the house and lot prices. However, living streams generate greater value than other types of POS. Furthermore, the POS (including living streams) that support active recreation are valued more than basic POS without active recreation features. Finally, we observe, for the first time, that the benefits of planned but not yet constructed POS (including living stream) are similar to the completed POS (including living stream) in both housing and lot markets. This information is useful for policymakers and developers making informed decisions about water-sensitive urban infrastructure.     

基于分块矩阵变换的线性分组码盲识别

为了解决传统矩阵分析方法存在的误码扩散问题，提出了一种基于分块矩阵变换的线性分组码盲识别方法。首先，将截获序列按照估计码长构造出分析矩阵，将分析矩阵分块后分别进行矩阵下三角变换；然后，以各列列重为度量，根据相关列重量的统计分布特性设置相关列阈值，并统计出符合阈值的相关列的个数，当相关列的个数最大时即为真实码长的情况。该方法还可以识别码字同步点，识别方法简单。理论分析及仿真结果表明，该识别方法的容错性能较好，在误码为5%的条件下，对(15,7)线性分组码的正确识别率依然能达到80%。     

基于场景理论的历史文化街区文化价值识别——以苏州平江路为例

消费转向下场景文化价值具备集聚创意人群、促进空间转型发展的功能。识别历史文化街区场景文化价值有利于促进街区空间活力提升、推动城市更新发展。本研究基于场景理论，利用扎根理论研究手段，在实证研究苏州平江历史文化街区的基础上，构建适用于历史文化街区场景文化价值识别方法，研究结果显示：（1）平江历史文化街区场景领袖魅力突出、传统要素凸显，形成迷人的本土化体验性空间；（2）历史文化街区场景文化价值可通过合法性、戏剧性、真实性等3大维度的25个指标进行识别；（3）历史文化街区场景舒适物涵盖自然景观、有形文化和消费娱乐设施等3类，其与环境氛围分别构成场景的“形”与“韵”，经由感知/认知、消费、个人信息加工处理转换为“感”，即个体情感记忆，进而识别场景文化价值。研究通过场景文化价值识别过程丰富场景理论在历史文化街区这一特定空间的应用，也为平江历史文化街区衡量其场景特征与规划定位之间的差异程度提供参考。     

大跨度高墩连续梁0号现浇支撑系统研究

进行西河大桥大跨度连续梁的高墩0号段现浇施工时,经科学比选及评估,模板支撑体系采用了墩顶锚固三角架法。并对传统的锚固三角架法的支撑构造进行了优化和创新,克服了该类型支架存在高空作业和高空焊接多,构件焊接质量难以控制而存在较大安全隐患等问题。使得本项目0号块现浇支撑体系在安全、经济、进度及造价方面均取得了良好的效果。     

The evolvement of momentum effects in China: Evidence from functional data analysis

Using an approach based on functional data analysis, we address the controversy that momentum or reversal effect disputes exist in China’s A-shares markets. It finds patterns of nonlinear cross-sectional variation and the dynamic change of average stock returns over time. After the global financial crisis of 2008, our empirical results show that momentum effects in the middle term went away and reversal effects took over. We also find substantial reversal effects for the short- (1-6 months) and long-term (3 years), respectively, but no evidence of permanent momentum effects in China.     

“反桥”背景下街区景观重构与场所共生

随着城市化的不断深入，城市建设的重心由增量拓展转向内部更新，城市整体形象提升的同时，面临着如何回应新时代城市生活需求，以及关乎城市本源的景观重构与场所共生。城市高架桥(路)在城市空间结构、功能效率和景观环境等诸多方面具有双面性，面临可持续发展的多方面挑战。梳理景观重构应对“高架危机”的“空间-场所”改造探索模式；指出高架桥更新需纳入城市空间-社会的动态发展系统之中，并结合“反桥”背景下的改造实践分析高架桥景观重构在城市多维整合中的意义与影响，揭示科学决策、整体协同、均衡化效益的城市多维整合作用机制；系统总结城市高架桥改造的街区景观重构与场所共生策略。通过反思，指出以景观重构与场所共生切入高架桥改造可为城市更新提供新思路。     

区块链技术下供应链金融的研究热点与趋势——基于CiteSpace的可视化分析

区块链赋能供应链金融，贸易背景的真实性审核简单，供应链上中小微企业更易获得金融机构授信。以2016—2021年CNKI数据库中的247篇期刊论文为研究对象，运用CiteSpace文献计量软件对其进行关键词共现、聚类分析等，揭示区块链技术下供应链金融研究的知识结构与演进规律。研究发现：区块链技术下供应链金融研究刚刚兴起，核心作者发文量较少；高校是研究的主力军，研究能力与经济发达程度为正相关；中小微企业这个聚类是该领域的重要研究热点趋势。     

Interactive R&D spillovers: An estimation strategy based on forecasting-driven model selection

This paper proposes an estimation strategy that exploits recent non-parametric panel data methods that allow for a multifactor error structure and extends a recently proposed data-driven model-selection procedure, which has its roots in cross validation and aims to test whether two competing approximate models are equivalent in terms of their expected true error. We extend this procedure to a large panel data framework by using moving block bootstrap resampling techniques in order to preserve cross-sectional dependence in the bootstrapped samples. Such an estimation strategy is illustrated by revisiting an analysis of international technology diffusion. Model selection procedures clearly conclude in the superiority of a fully non-parametric (non-additive) specification over parametric and even semi-parametric (additive) specifications. This work also refines previous results by showing threshold effects, non-linearities, and interactions that are obscured in parametric specifications and which have relevant implications for policy.     

旅游休闲街区：概念、内涵与形成机制

在旅游新发展态势下，休闲化成为人们追求的重点。旅游休闲街区作为文化特色鲜明的文化空间，将休闲与旅游融合，契合了深度特色体验旅游的发展趋势。分析旅游休闲街区的内涵、主要特征及形成机制，得出结论：旅游休闲街区主要包括特色商业街区、娱乐休闲街区、历史文化街区；旅游休闲街区具有兼顾主客需求、文化特色鲜明、多元业态融合、时空开放共享等特征；旅游休闲街区的形成与发展是多种要素共同作用的结果，主要包括城市旅游发展、市场需求、文旅融合和政府政策等方面，它们在旅游休闲街区形成过程中分别起到基础性力量、决定性力量、驱动性力量和主导性力量的作用。