工业集聚与污染排放强度——基于固定效应门限回归模型的再检验

为研究工业集聚对污染排放强度的影响，本文选取2000~2015年全国30个省市（自治区）的面板数据，以工业集聚为门槛变量，利用固定效应门限回归模型，实证分析了不同工业集聚水平对污染排放强度的影响。结果发现：工业集聚对废水排放强度的影响存在显著门槛效应，在达到门槛值前，工业集聚很大程度降低了废水排放强度，在跨过门槛值后，这种作用会减弱。工业集聚与废气排放强度呈显著倒“U”型关系，在工业集聚水平小于门槛值时，工业集聚会加剧废气排放，大于门槛值后，工业集聚会降低废气排放强度。工业集聚会降低废物排放强度，但未出现显著门槛效应。     

空分装置运行常见故障与排除

本文介绍了空分装置运行过程中易出现的故障,分析故障产生的原因,并对故障提出了相应的解决方法和措施,对装置的日常运行提出针对性的建议,从而延长装置的运行周期,减少装置检修次数,为企业带来显著的效益。     

创始股东保护问题研究——国美股权与控制权之争对中国公司治理的启示

国美虽在英属维尔京群岛注册，在香港交易及结算所有限公司上市，但仍不失为一家典型的中国式家族企业。国关事件展示了一个失衡的公司治理架构，即管理层可在两权分离的立法模式下实现内部人控制，风险投资人可通过议定投资协议来约束管理层，但创始股东则因受制于一股一权的强制性规范而容易失去对公司的控制权。为维护其创业诉求，建议创始股东除传统控股，还应特别设计公司章程来预留特定董事席位，并约定优先股等保护条款。     

Does delaying service-failure resolution ever make sense?

Conventional wisdom suggests that service providers should respond to their failures as quickly as possible. Some research, however, points out that delaying resolutions may produce highly desirable results. The study here investigates these competing views by examining under which conditions an immediate or a delaying resolution produces more positive consumer responses in term of re-patronage and negative word-of-mouth intentions. Based on the concept of service separation, this research identifies an interaction effect between service separation (separated service, non-separated service) and response timing (immediate response, delaying response) on consumers' post-consumption intention. This research also finds that the relationship between service separation-response timing interaction and consumer response is mediated by consumers' negative emotions. This study contributes to refining our understanding of consumer psychology in service recovery. Practically, the studies also enable service providers to better allocate their resources to recover different types of services' failure.     

现阶段农地流转中的关键问题与微观制度创新——四川省安岳县农村土地流转实践考察

现阶段我国宏观层面的农村土地“三权分置”制度和流转机制仍处于加紧构建和完善过程中，急需微观层面的创新实践提供经验支持和政策借鉴。四川省安岳县农村土地流转具有土地利用特色鲜明、推行时间长、流转规模大、流转效果较好等特征，但也存在流转行为不规范、农户利益难以保障、土地利用效率不高等关键问题。近年来，安岳通过建立“信用保证金”制度、“照市过价”制度和“土地再流转”制度，达到了规范土地流转行为、土地流转定价市场化和提高土地资源利用效率的目的，有效解决了当地农村土地流转中存在的突出问题。当前，在农村土地流转实践中，应加强对承包业主的信用评价与监管，积极推动土地流转定价市场化，充分提高土地资源利用效率。     

The effectiveness of fear appeals in ‘green’ advertising: An analysis of creative,consumer, and source variables*

This study focused on the effectiveness of fear appeal messages used to arouse a threat in green advertising. An experiment recruited 175 participants to test the influence of the advertising appeal (fear vs. non-fear appeal), source (for-profit vs. non-profit organizations), and involvement with the environment on attitude toward the ad (A_ad), attitude toward the product (A_p) and purchase intention (PI). Results revealed that a fear appeal in a green ad negatively affected A_ad and A_p and that participants who were highly involved with the environment were more likely to have positive attitudes toward the green ad and advertised green product as well as a stronger intent to purchase it. The source type in the green ad did not affect ad effectiveness and involvement with the environment did not moderate the effects of either appeal or source.     

河南省农业面源污染成因分析

近年来,农业面源污染给我国农村生态环境造成了一定的破坏,挖掘农业面源污染的成因及问题对今后农业面源污染的治理具有重要意义。文章以河南省为探讨对象,首先阐述了农业面源污染含义及主要特点。利用文献分析和统计方法对河南省农业化学品投入使用及污染情况进行分析,2007~2014年河南省化肥及农药产量和使用量均呈上涨趋势,污染面积及范围进一步扩大,面源污染的主要来源是化肥、农药、秸秆及生活垃圾。而人口快速增长、经济利益驱使、政策方面不健全是造成农业面源污染主要原因。该文认为,解决农业面源污染应从推广减量技术,积极发展有机(生态)农业;提高思想认识,树立科学农业发展理念;大力推广精准农业,减轻面源污染程度;建立健全环境法规,完善政策及管理体系等4个方面入手,以期为其他地区农业面源污染治理提供借鉴和参考。     

基于红外图像的林火识别方法及实现

森林火灾是一种突发性强、破坏性大且处置救助较为困难的自然灾害,会对森林、森林生态系统和人类带来一定危害和损失。早期的林火判别多基于温度、烟雾以及24小时图像监测实现,主观性强,标准单一,且误报率高。如何快速发现林火目标并及时报警扑灭,已经成为国内外学者研究的热点之一。文章基于红外热像仪,对大量森林背景及模拟林火状态进行了图像和温度数据的采集,首次提出了基于温度标准差方法进行热源识别的概念,得出了不同地点、不同时间段森林背景的温度标准差分布,以及明火温度在各阶段的波动范围,为林火的预防和监测提供了重要依据。同时,通过对干扰源进入前后的红外图像进行预处理和分析,对比目标热源的像素面积变化率及其圆形度,即可准确实现部分干扰热源的排除。实验结果证明,将此基于红外图像的热源初判原则与干扰源排除的规律应用于林火监测,方法简单有效,准确率高,对降低森林火灾的发生率,提高社会经济效益有着重要的作用。     

Current issues and research trends on open-source software communities

Open source software (OSS) projects represent a new paradigm of software creation and development based on hundreds or even thousands of developers and users organised in the form of a virtual community. The success of an OSS project is closely linked to the successful organisation and development of the virtual community of support group. This paper reviews different fields and research topics related to the OSS communities such as collective intelligence, the structure of OSS communities, their success, communities as virtual organisations, motivation, shared knowledge, innovation and learning. The main challenges, results obtained, and the knowledge areas are detailed for each topic.     

新疆棉农对农业面源污染防治的态度和支付意愿研究

农业面源污染问题已经成为我国面临的最严重的环境污染问题之一,农户对农业面源污染防治的态度和支付意愿研究,对于政府制定相关政策措施意义重大。分别采用李克特五点量表、条件价值评估法、多元有序Logistic模型回归等方法对(1)棉农对农业面源污染防治的态度,(2)棉农对农业面源污染防治的支付意愿(WTP),(3)影响棉农支付意愿的社会经济因素进行研究。结果表明:新疆棉农对农业面源污染防治的态度非常积极,但是当与自身利益相冲突时,则趋向于以牺牲环境为代价;新疆每户棉农对农业面源污染防治的支付意愿是113.96元/年,49.64%的被调查者选择的支付区间是[12,60)元/年,累计百分比占70.65%;农户的教育水平和是否参加过农业专业合作组织是新疆农户农业面源污染防治支付意愿的主要影响因素。基于此,得出结论并提出相应的对策建议。