乡村旅游开发下农户生计适应变化与影响机理研究*——以延安市乡村旅游为例

［目的］以延安市3个典型乡村旅游地为例，结合可持续生计分析框架和适应性理论，分析农户在乡村旅游扰动下的适应策略与适应模式，定量测度不同适应模式农户的适应结果。厘清农户未来生计策略选择的影响因素及其机制，提出促进农户及乡村旅游地可持续发展的对策。［方法］通过参与性农户评估法及二元回归分析法分析影响农户未来生计策略选择的因素。［结果］（1）旅游开发造成案例地农户自然资本丧失，失地农户由务农或务工为主的单一适应方式向兼业型与非农型转变，分化为4种不同类型的农户，且各类农户在各描述指标方面差异显著。（2）农户的生计资本衡量3个社区旅游开发后的适应结果，生计资本普遍较低且内部各维度差异明显。对比4类农户适应结果可得：复合生计型>务工主导型>旅游服务型>社会保障型。（3）通过二元逻辑回归模型深入解释当下适应结果对农户未来生计策略选择的影响，物质资本、金融资本和社会资本均影响农户选择意愿，其中可借款人数是最关键的影响变量。［结论］农户在旅游开发背景下生计动态适应的影响机制为旅游开发及基于此补偿制度是农户现在生计适应活动的外部起因，按照适应类型以及收入比重，分化为4种模式农户； 现行生计适应策略使农户适应结果迥异，生计资本的储量和结构差异显著，这种差异是农户未来生计选择的直接动因； 3个社区不同类型的旅游开发模式是农户未来生计策略选择分异的推动力量。     

区域数字经济协调发展的实现路径

数字经济发展迅猛,已成为推动我国产业升级与区域协调发展的重要驱动力.目前,我国区域数字经济发展仍存在明显的空间差异,但差距也在逐渐缩小.地区经济水平、城镇化水平对各区域数字经济发展均起到正向推动作用,产业结构高级化水平、政府干预度和对外开放水平对数字经济发展的影响具有明显的区域异质性.需要在缩小区域经济差距、完善数字基础设施、提高数字技术应用和创新水平的基础上,立足区域驱动因素,加快建立区域优势互补和协同发展机制,有效推动区域数字经济协调发展.     

国内军队后勤研究热点主题及趋势分析

军队后勤是决定战争胜负的重要因素之一,先进、完善的后勤保障,是奠定我军胜利的基石.理顺军队后勤的研究脉络,对后续理论研究和实践工作具有十分重要的意义.运用知识图谱分析软件,以CNKI收录的309篇军队后勤的相关学术论文为对象,利用关键词共现图和突现词分析等方法揭示军队后勤研究领域的研究重点和发展方向.从分析结果上看,我国军队后勤研究趋于缓慢,研究视角较为狭窄.今后应充分利用社会资源,加强军民融合,改变目前重理论、轻分析、重顶层设计、轻基层实践的学术氛围,深入分析目前军队后勤发展所遇到的实际困难,为提高我军后勤保障力量提供支持和帮助.     

The effects of credit default swaps on corporate investment

ABSTRACT

This paper examines how credit default swaps (CDS) affect the corporate investment of the referenced entities. We document a significant reduction in corporate investment after CDS trading, a result that is robust to alternative model specifications and a set of endogeneity tests. Our findings of the increased firm risk and cost of capital support the costly external capital channel. The cross-sectional variations in CDS effects demonstrate that both reduced monitoring and the empty creditor problem might be the underlying forces driving the costly external capital channel. Our additional analysis implies that CDS trading is associated with an enhancement in investment efficiency for firms that are prone to overinvestment.     

长江经济带人才集聚水平测度及时空演变研究——基于价值链视角

基于价值链视角，构建涵盖人才资源在区域空间层面集聚生成、地区配置、效能产出3个维度在内的区域人才集聚水平评价指标体系，采用专家咨询AHP-信息熵组合赋权法构建综合评价模型和耦合协调度模型，对2010—2018年长江经济带沿线省市人才集聚水平进行测度与时空演化特征分析。结果表明，就长江经济带整体而言，考察期内地区人才集聚水平总体呈现逐年上升态势，但仍处于低水平状态；沿线省市人才集聚水平差异显著，缩小趋势渐缓，整体呈现局部高水平、全局低效率的不利境况；各省市人才集聚水平关键维度的耦合协调度整体呈显著波动递增态势，但内部耦合协调度存在不平衡发展问题，影响地区人才集聚水平整体提升。为提升长江经济带人才集聚水平，推进沿线地区协调发展，需强化区域人才合作机制，采取差别化精准策略破解沿线地区人才集聚低水平、不协调的短板因素。     

金融发展、环境规制与经济绿色转型

推动经济绿色转型是"十四五规划"的主要目标之一,经济绿色转型的本质是发展方式变革,环境投资在这一变革中具有举足轻重的作用.在当前财政资金只能覆盖少量环境支出的情况下,激发微观企业自主环境投资需求并缓解企业环境投融资约束成为未来工作的重点,需要进一步推动金融发展和健全环境规制,从而在实体经济供需两端形成绿色转型的合力.基于2004-2015年全国284个城市工业生产、污染防治和战略新兴产业技术创新等数据,文章研究发现,在环境规制未能显著发挥政策效应的情形下,金融发展能协同环境规制促进经济绿色转型.这表现在,金融发展协同环境规制显著提升了城市环境效益但未对城市经济效益产生冲击.机制分析表明,协同作用能促进工业污染治理提升城市资源使用效率,并促进战略新兴产业技术创新推动产业结构转型.上述结论在一系列内生性和稳健性检验中均保持不变.异质性分析揭示,环境信息不对称加剧、市场中介组织发育不完善以及技术创新转化能力弱等显著削弱了协同作用的发挥.因此,提升金融部门资金配置和开展绿色金融业务的能力,注重发挥金融发展与环境规制的协同作用有利于促进经济绿色转型.     

Covid-19-tested food labels

While the transmission of virus SARS-CoV-2 via food is rare, some Chinese food retailers are considering a Covid-19-tested food label. However, how consumers may support such a label is unknown. We quantify Chinese consumers’ willingness to pay (WTP) for food carrying a Covid-19-tested label using an online choice experiment. We find that the WTPs for such a label are always positive for all food products considered. The amount of WTP depends on the entities authenticating the labels, country of origin of the food, and consumers’ socio-demographic status. Contrary to expectation, the knowledge on Covid-19 does not affect consumer preferences for the Covid-19-tested food labels. Our benefit and cost analysis suggests a possible large benefit of creating and administering a Covid-19-tested food label. This study provides insights for policymakers, global food manufacturers, and retailers to create marketing strategies to alleviate consumer food safety concerns associated with Covid-19.     

珠三角工业设计与工业互动比较研究：双重需求拉动与设计驱动增长的区域验证

动态比较珠三角工业发展阶段和设计水平不同的典型区域内，工业用户和最终消费者用户双重需求拉动设计创新以及设计驱动工业增长作用机制的异同，提出克服互动系统短板并因地制宜实施设计驱动转型升级的对策建议。基于SVAR建模的脉冲响应和方差分解分析发现：珠三角工业确实可以通过工业设计创新驱动实现内生性可持续增长，而设计水平的地区差异对设计驱动绩效有调节作用；工业发展质量和结构欠佳，无法有效拉动区域工业设计创新，是珠三角多数地区工业设计有效需求不足的根本原因。区域工业设计与工业互动系统的短板是缺乏内行和挑剔的最终消费者有效需求。最后基于模型稳健性检验，提出因地制宜科学实施设计驱动发展战略的对策建议。     

iSDS: a self-configurable software-defined storage system for enterprise

ABSTRACT

Storage is one of the most important aspects of IT infrastructure for various enterprises. But, enterprises are interested in more than just data storage; they are interested in such things as more reliable data protection, higher performance and reduced resource consumption. Traditional enterprise-grade storage satisfies these requirements at high cost. It is because traditional enterprise-grade storage is usually designed and constructed by customised field-programmable gate array to achieve high-end functionality. However, in this ever-changing environment, enterprises request storage with more flexible deployment and at lower cost. Moreover, the rise of new application fields, such as social media, big data, video streaming service etc., makes operational tasks for administrators more complex. In this article, a new storage system called intelligent software-defined storage (iSDS), based on software-defined storage, is described. More specifically, this approach advocates using software to replace features provided by traditional customised chips. To alleviate the management burden, it also advocates applying machine learning to automatically configure storage to meet dynamic requirements of workloads running on storage. This article focuses on the analysis feature of iSDS cluster by detailing its architecture and design.     

What We Should Know About House Reconstruction Costs?

The Journal of Real Estate Finance and Economics - This paper presents two important analyses, which have been derived from a rich dataset supplied by an important Property & Casualty...