交易成本视角下深圳生态线内社区的改造困境和策略

生态控制线是生态空间管控的重要举措之一,也是保护城市生态环境和提升生态环境质量的有效手段。但是,由于复杂的产权纠纷和历史遗留问题,它的划定在实际操作过程中面临着诸多挑战。妥善处理生态线内已建社区和合理进行社区改造已成为重要议题。本文以深圳市为例,系统梳理生态线内社区的特征,并引入交易成本的概念,分析生态线内社区改造过程中政府、社区、居民和开发商等利益主体的成本与收益,指出生态线内社区改造的难点在于交易成本过高以及收益与成本缺口巨大,并在此基础上提出一系列针对性的改造策略,以期更好地推进生态线内社区改造,逐步完成生态修复工作,更好地实现生态价值与社会经济价值,并为其他城市提供借鉴和参考

The Impact of Walking Accessibility of Public Services on Housing Prices:Based on the Cumulative Opportunities Measure

构建节能环保低碳的"绿色交通体系"是目前解决城市交通及其一系列衍生问题的重要举措。"将生活与服务混在一起"对于提升步行效能、促进步行和降低机动交通需求有重要的现实意义。公共服务设施步行可达性,反映居民获取公共服务设施的难易程度,对住宅价格具有资本化效应。文章以厦门岛1840个普通多、高层住宅为样本,通过累积机会法评价教育、商业、医疗和文体4种公共服务设施的步行可达性,并构建特征价格方程来检验公共品在住宅市场的资本化方向与程度。研究发现,教育、医疗和商业3类公共服务设施的规划布局已资本化入住宅价格:教育和商业服务步行可达性对住宅价格有正向影响,而二、三甲医院步行可达性有负向影响;省示范小学步行可达性对房价的正向影响大于重点中学;市区级文化体育中心对房价的影响不显著。特征价格模型也实证估计了各特征变量对住宅价格的影响程度。Establishing an environment- friendly and low- carbon "green transport system "is an important approach to solve the problems of urban transport and a series of its derivatives. M ixing living and urban services together has a great significance to increase the utility of w alking,promote w alking and reduce the motorized travel demand. The w alking accessibility of public services,referring to the ease to reach the public services facilities in the w alkable region,affects the housing prices. Based on 1840 housing samples in multi- or high- story residence communities in Xiamen Island,the paper uses the cumulative opportunities method to measure the w alking accessibility of public service facilities,and develops hedonic price models to study their effects on housing prices. It finds the follow ing : the externality of three types of public services( education,health care and business services) have been capitalized into housing prices; The w alking accessibility of education and health care facilities have a positive effect on house prices w hile the w alking accessibility of class 2A and 3A comprehensive hospitals affects the housing prices negatively; The effect of star primary schools is greater than that of star middle schools; City / district- level cultural and sports center's w alking accessibility does not affect housing prices. The calibrated hedonic price model empirically estimates the impacts of all characteristics.国家自然科学基金青年项目(51208444);; 教育部人文社会科学研究青年基金项目(11YJCZH058);; 中央高校基本科研业务费项目(20720140519)资

JUNO Sensitivity on Proton Decay p→νˉK+p\to \bar\nu K^+ Searches

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this paper, the potential on searching for proton decay in $p\to \bar\nu K^+$ mode with JUNO is investigated.The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits to suppress the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar\nu K^+$ is 36.9% with a background level of 0.2 events after 10 years of data taking. The estimated sensitivity based on 200 kton-years exposure is $9.6 \times 10^{33}$ years, competitive with the current best limits on the proton lifetime in this channel

JUNO sensitivity on proton decay p → ν K + searches*

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this study, the potential of searching for proton decay in the $p\to \bar{\nu} K^+$ mode with JUNO is investigated. The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits suppression of the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar{\nu} K^+$ is 36.9% ± 4.9% with a background level of $0.2\pm 0.05({\rm syst})\pm$$0.2({\rm stat})$ events after 10 years of data collection. The estimated sensitivity based on 200 kton-years of exposure is $9.6 \times 10^{33}$ years, which is competitive with the current best limits on the proton lifetime in this channel and complements the use of different detection technologies