中国自由贸易试验区的改革深化与自由贸易港的建立

中共十九大为中国自由贸易试验区下一步的发展指明了方向。中国自由贸易试验区在经济市场化方面取得重大进展,颁布了一系列法律规范,旨在营造国际化、法制化和市场化的营商环境,但在开放方面还不够深入和系统化,因此十九大为自由贸易试验区的进一步发展提出了更高目标,指明了新的方向。我们建议把每个自由贸易区分为海关监管的自由贸易区和非海关监管的改革试验区。自由贸易区把成熟的经验推广到改革试验区,改革试验区再把经验推向全国。所有的自由贸易试验区采用不同模式,包括货物贸易和服务贸易自由贸易区、直接投资与金融自由贸易区和金融中心自由贸易区等。     

Tick Size and Financial Reporting Quality in Small-Cap Firms: Evidence from a Natural Experiment

Using a natural experiment (the SEC's 2016 Tick Size Pilot Program), we investigate the effects of an increase in tick size on financial reporting quality. The tick size pilot program reduces algorithmic trading (AT) and increases fundamental investors’ information acquisition and trading activities. This in turn increases the scrutiny of managers’ financial reporting choices and reduces their incentives to engage in misreporting. Using a difference-in-differences research design, we find a significant decrease in the magnitude of discretionary accruals, a significant reduction in the likelihood of just meeting or beating analysts’ forecasts, and a marginally significant decrease in restatements for the treated firms in the pilot program. Furthermore, we find that the change in financial reporting quality is concentrated in treated firms experiencing decreases in AT and increases in information acquisition activities. We also find that the mispricing of accruals is significantly lower for treated firms. Taken together, our results suggest that an increase in tick size has a causal effect on firms’ financial reporting quality.     

珠海市跨境电商产业培育政策评价研究

为了研究珠海的跨境电商产业政策的效果,本文利用文本挖掘与PMC分析方法,选取珠海市跨境电商7项典型支持政策,建立13项一级指标和60项二级指标,对政策进行评价,结果显示:1项跨境电商政策评价为完美,2项评价为优秀,其余4项为可接受。就一级指标分项来看,加大资金投入、推进对外贸易发展、提高海关便利、作用对象和促进产业集聚方面表现较好,其他方面有待改进。结合珠海跨境电商政策与珠海实际情况,发现珠海在发展跨境电商方面存在四个主要问题,分别是过分注重资金投入、对跨境电商产业链认识不足、对跨境电商产业支持对象认识不清、跨境电商法律治理能力重视不够等问题,并针对上述四个问题,提出解决对策,期望为珠海跨境电商产业的进一步发展提供政策的改进与完善对策。     

浆态床一步法二甲醚产业化技术突破与进展

介绍了清华大学与重庆英力燃化有限公司合作开发的燃料级二甲醚合成中试研发进展。采用新型循环浆态床反应器一步法合成二甲醚技术取得了实质性突破，并获得了良好的中试结果：CO单程转化率达到60％以上，DME选择性达到94％，明显优于APCI和NKK的浆态床二甲醚合成工艺。     

Consumer food safety perceptions and self‐reported practices in Greece

A substantial proportion of foodborne illness is associated with food prepared in households. The primary understanding of how foods are handled in private homes comes mostly from questionnaire based studies and direct observation. The aim of this survey was to examine consumers' perceptions and knowledge of safe food handling practices in Greece. More specifically, their attitudes, opinions and self‐reported practices were studied. Data were collected from a total of 399 consumers living in Greece by the use of a self‐administered on‐line survey. The questionnaire consisted of four positive and five negative statements according to the 5‐point Likert scale, which grouped into three constructions using principal component analysis in order to investigate food safety perceptions of consumers. Furthermore, the survey included 11 demographic questions, two close‐ended questions (type yes/no) and four questions that are related to self‐reported food‐handling practices. The results showed that the most commonly known bacterium causing food‐related illness according to respondents' knowledge is Salmonella (99.7%), followed by Escherichia coli (73.9%) and Listeria (58.4%). The overall consumers' score concerning food safety was 32.8 ± 5.37 (full score was 45). No significant differences to the mean score of food safety knowledge were found according to gender, age or the incidence of foodborne illness over the past 12 months. Knowledge and awareness of safe food handling practices was enhanced at higher education levels, while homemakers were found to have deficiencies at this level. Information obtained from consumers can be used to shape educational programs and determine where food safety educational efforts would be most effective and the needed content of the messages.     

浅谈营盘山隧道岩溶处理

本文主要通过对营盘山大型溶洞施工组织顺序上的调整和对施工工艺工法顺序的处理方法调整及选择方面介绍,希望对类似的溶洞处理的施工有一定借鉴意义。     

我国乡村生态旅游发展中的政府行为研究

乡村生态旅游作为一种新的旅游业态,在乡村旅游中注重生态环境与产业的可持续发展,对农民增收与农村环境保护有重要的促进作用。但目前国内大部分地区对于乡村生态旅游,从概念上到操作上仍然是十分模糊的,这在很大程度上限制了政府对旅游项目有效管理。文章研究认为,乡村生态旅游具有一定公共物品属性,完全依靠市场调节是远远不够的,在不同地区和不同阶段都需要政府介入,但政府行为应当结合具体阶段特征采取适宜策略。政府应通过乡村旅游试点项目的实施,对其有效性、效率、影响和可持续性进行科学的监测和评价;将能力建设同具体的项目操作有机地结合起来,促进乡村生态旅游项目实施效果和效率的提高;应尽量减少行政干预,通过经济宏观调控,强化规划引领、市场监管和公共服务提供。总之,在乡村生态旅游发展中,政府应该有所为有所不为,扮演好主导、扶持与服务的角色。     

内陆开放型经济试验区引入信用评级机构的相关问题研究

信用评级具有减少信息不对称、实现社会资源优化配置、促进经济良性发展的润滑剂作用,因此,宁夏内陆开放型经济试验区引入信用评级机构十分必要。结合宁夏实际,分析信用评级机构的发展模式,认为内陆开放型经济试验区引入信用评级机构应当采取＂政府推动、市场运作、人行监管＂模式,并且引入后应从提升业务人员水平、完善监管方法、加强业务指导等方面,推动信用评级机构健康发展。     

快速校正天波雷达电离层相位污染的改进方法

时变的电离层会对天波超视距雷达(OTHR)回波信号相位进行调制，产生相位污染，导致回波谱展宽。最大似然估计(MLE)法具有比相位梯度法更佳的污染校正效果，但计算量非常大。通过引入投影近似子空间跟踪法，提出了一种改进的MLE方法。改进方法采用递归手段估计最大特征值对应的特征向量，避免了特征值分解过程，能够显著降低计算量，污染校正效果与MLE法相当。理论分析与仿真对比表明改进方法普适性强，计算量只有MLE法的万分之一，更适合工程实现。     

河北省新型农村养老保险试点分区域调查研究

新型农村养老保险制度是整个社会保障制度体系中的一个重要的组成部分。在对河北省新农保试点地区进行实地调研的基础上,从人们对政策的认知程度、参保率、宣传和经办服务、制度期望等多角度全面分析试点推进过程中存在哪些现实问题和主要难点,并借鉴其他省市试点经验,提出具有针对性的对策建议。