TOOR: A Novel Product Title Optimization Method Based on Online Reviews in E-commerce

Titles of online products play an important role in attracting consumers and promoting product sales in e-commerce. However, current online product titles only cover basic features and cannot reflect the preferences of consumers exactly. To address this problem, this research proposed an online title optimization method based on the analysis of online reviews, which is called TOOR (Title Optimization based on Online Reviews). In this research, we analyzed and compared product features extracted from online product titles and online reviews from the point of view of consumers and applied features extracted from reviews to title optimization. In order to verify the effectiveness of the proposed method, two experiments were conducted in this paper, selecting four typical smartphones as experiment samples and Taobao.com as the data resources. The experimental results indicated that features extracted from online reviews can better reflect the consumers’ concern, and the titles optimized by the TOOR method are more appealing to consumers and have higher click-through rates.     

芦丁的提取及其在小鼠试验中表现的生物活性综述

芦丁作为黄酮类主要成分的代表,受到科研界的高度重视,目前芦丁的提取应用技术比较成熟。将从芦丁的来源,提取技术以及芦丁在小鼠试验中表现出的生物活性,芦丁的研究前景几个方面进行综述。重点研究芦丁的生物活性在小白鼠体内的表现。为芦丁的工业生产和应用提供参考。     

重点产业环节选择理论与方法研究——水晶模型分析框架

新时期重点产业环节选择研究具有重要的理论价值与实践意义。在对相关理论进行了梳理和重构的基础上,从我国主体功能区建设的时代要求出发,系统构建重点产业环节选择的水晶模型及分析框架,研究认为重点产业环节选择不同于主导产业选择,是一个复杂的"水晶"体系,主要包含八大主要影响要素,即主体功能区建设、市场需求、技术经济、生产要素供给、产业基础、产业关联、政府和全球化,并由此提出相应的的八大选择基准。最后以湖南省太阳能光伏产业重点环节选择为例,进行了实证分析和理论检验。     

The Tourinho model: neglected nugget or a receding relic?

This article evaluates Tourinho's (1979b Tourinho, O. A.F. 1979b. “The valuation of reserves of natural resources: an option pricing approach”. Berkeley: University of California. PhD thesis [Google Scholar]) work as one of the earliest contributors to the real options literature. His model pioneered the application of risk neutrality to uncertain investments, but his originality of introducing an option-holding cost albeit to overcome the extraction paradox is rarely imitated. We claim that the combination of a convenience yield and an option-holding cost produces a more satisfying representation. Moreover, variations in the holding cost give rise to a host of investment decisions ranging from the standard real option solution for a zero-holding cost to a net present value solution for an infinite-holding cost. Not only does the holding cost mediate between these two poles, but it provides the option seller (usually a landowner or a government) with a policy instrument for influencing the extraction timing and thus the extraction profit of the option buyer. We derive the holding cost that optimizes the landowner's combined value of the option premium, holding costs and eventual royalties.     

区域瓦斯综合治理工艺研究——以宝雨山矿为例

在煤矿开采过程中,宝雨山矿不断进行着瓦斯防治方面的研究与实践,为区域瓦斯治理工作的开展积累了宝贵经验。近年来,随着矿井的开采,瓦斯涌出量不断增加,该矿针对通风系统进行优化,实施瓦斯抽采,建立瓦斯监控系统,重点强调矿井安全管理模式的转变,实现矿井安全生产和快速发展。     

气相色谱法测定水果、蔬菜中多种拟除虫菊酯类农药残留

【目的】建立快速、准确测定水果、蔬菜中4种拟除虫菊酯类农药残留量的方法。【方法】微波加速反应系统提取农药残留,固相萃取（SPE）柱净化,毛细管柱气相色谱法-μECD检测器测定。【结果】可同时分离检测4种拟除虫菊酯类农药残留,检出限均可达到0．00μg／mL,甲氰菊酯在0．001-5μg／mL范围内、其他3种菊酯在0．001～10μg/mL范围内线性关系良好,相关系数r〉0．9990;回收率为76．2％-105．9％,相对标准偏差为3．4％-12．0％。【结论】本方法灵敏度高、净化效果好、节省时间。     

反相高效液相色谱“蓝色素”快速检测方法研究

本研究采用反相高效液相色谱法,系统研究了蓝色素的分离提取方法,确定了蓝色素测定的色谱条件,在此基础上进行了色谱测定的方法学研究,明确了蓝色素的线性范围、精密度及回收率,建立了最佳的定量方法。     

食品包装材料中邻苯二甲酸酯增塑剂残留的检测

针对食品包装材料中邻苯二甲酸酯（PAEs）增塑剂残留,采用加速溶剂萃取（ASE）和GC／MS联用技术分析5种PAEs（DMP,DEP,DBP,BBP,DEHP）,结果表明加速溶剂萃取用于食品包装材料中PAEs的提取,最佳温度条件为120℃,最佳循环次数为3次。方法检出限达到0．1mg／kg．回收率达到95．5％-99．8％;并且具有很好的重现性和精密度。     

A dynamic mechanism and surplus extraction under ambiguity

We study the question of auction design in an IPV setting characterized by ambiguity. We assume that the preferences of agents exhibit ambiguity aversion; in particular, they are represented by the epsilon-contamination model. We show that a simple variation of a discrete Dutch auction can extract almost all surplus. This contrasts with optimal auctions under IPV without ambiguity as well as with optimal static auctions with ambiguity—in all of these, types other than the lowest participating type obtain a positive surplus. An important point of departure is that the modified Dutch mechanism is dynamic rather than static, establishing that under ambiguity aversion—even when the setting is IPV in all other respects—a dynamic mechanism can have additional bite over its static counterparts. A further general insight is that the standard revelation principle does not automatically extend to environments not characterized by subjective expected utility.