Ar^39／Ar^40 dating of three typical gold deposits in southern Qinling and its implication

1　ＩＮＴＲＯＤＵＣＴＩＯＮＱｉｎｌｉｎｇｏｒｏｇｅｎｉｃｂｅｌｔａｂｕｔｓＮｏｒｔｈＣｈｉｎａ ｐｌａｔ ｆｏｒｍｗｉｔｈＳｈａｎｇｚｈｏｕ ＤａｎｆｅｎｇｇｅｏｓｕｔｕｒｅｉｎｔｈｅｎｏｒｔｈａｎｄｎｅｉｇｈｂｏｒｓＹａｎｇｔｚｅ ｐｌａｔｆｏｒｍｗｉｔｈ     

我国油井管生产的回顾和展望

扼要介绍了油井管的品种、用途。分阶段介绍了我国油井管的生产发展过程以及我国钻杆的生产发展情况,指出根据油井勘探开发发展趋势,各生产厂应重点开发高难、特殊品种油井管。     

User satisfaction evaluation of microblogging services in China: using the tetra-class model

This study is aimed at revealing the contributions of microblogging services to user satisfaction in China. An empirical investigation was conducted to analyse user experience on the 36 main microblogging service elements, using a sample of 216 users of Sina Weibo, which is the biggest microblog in China. The tetra-class model was then applied to identify the contribution of each service element to the overall satisfaction. Through correspondence analysis, we calculated, respectively, the contribution to dissatisfaction when the service element was negatively evaluated and that to satisfaction when it was positively evaluated. Based on these two contribution values, we classified the service elements into four categories: Basic, Secondary, Plus, and Key. In order to know the preferences of different users towards the microblogging service elements, we segmented the users into groups according to their microblogging characteristics and personal attributes and then discussed the variations of the service, categorising among different user groups. Finally, we analysed the results and reached some conclusions, which could be helpful for the improvement of customised microblogging services.     

How the environment determines banking efficiency: a comparison of banking firms in Taiwan,Hong Kong,and Mainland China

This study uses the three‐stage data envelopment analysis (DEA) model to explore the true managerial efficiency of the banking firms in Taiwan, Hong Kong, and Mainland China. The empirical results indicate that the environmental conditions have a significant impact on banking efficiency. When the country‐specific situations are important factors in explaining efficiency difference, the common frontier estimates obtained by neglecting those factors can generate biased and overestimated inefficiency levels. With findings obtained from the slack variable analyses, the current study can provide inefficient banks with ways to reduce their input waste through the adjustment of input allocations. The findings also confirm the importance of the three‐stage DEA and its applications in determining the true managerial efficiencies of banks. Without the three‐stage DEA, the management could be misguided when making strategic decisions and conducting inappropriate resource allocation.     

基于关键字的单协议分类

网络协议是网络通信中一系列标准的集合,未知协议的识别和分析对网络监管、保障网络安全具有重大意义。协议识别技术多种多样,但大都不适用于二进制的协议识别。在此针对现有的协议识别技术的局限性,提出了一种在双方单协议通信环境下的多种类型二进制数据帧的协议识别方法。该方法首先利用n-gram技术对数据帧进行分割,然后利用无监督的特征选择算法提取特征串集合,从而利用聚类算法实现协议消息的识别。最后在ICMP上对该方法进行评估,消息识别的准确率和召回率均可达到90%以上。     

Affordances of social media in collective action: the case of Free Lunch for Children in China

This paper studies the socialised affordances of social media in the processes of collective action, exploring the role of technology in the under‐researched area of civil society. We examine the case of Free Lunch for Children (FL4C), a charitable programme in China based on the microblogging platform, Weibo. Adopting the perspective of affordances‐for‐practice, we draw upon the collective action model to better understand the sociomaterial practices and social processes involving social media, and seek to address the ‘when’ and ‘how’ questions of affordances. The study generates theoretical and practical implications for understanding the role of social media in social transformation.     

非自愿移民政策与我国水库移民政策之比较分析

非自愿移民政策作为一个适用于各个国家世界银行开发项目的指导性政策,被广泛运用于世行支持的国际项目中。随着“一带一路”战略的推进,我国水电企业参与海外发展项目建设的步伐明显加快。分析了世行有关非自愿移民政策与我国水电工程移民政策的异同,从中学习其有益的经验,为我国企业在国际基础设施项目建设中做好移民安置工作、提高工程效益提供借鉴。     

我国北方区域地下水演化研究综述

基于"六五"至"十二五"期间有关区域地下水演化的国家和省部级重点科技项目主要成果,对近30年来我国地下水演化研究的主要进展进行了综述。我国区域地下水演化研究主要集中在北方地区,项目选题的起源和立项的时代背景具有鲜明的时代性和社会重大需求驱动,包括华北和西北地区流域尺度地下水演化的国家重点项目研究,都是围绕国家目标或区域经济发展重大需求,及时揭示了气候变化和人类活动影响下区域地下水演化的关键科技问题,突显了重大科学研究的时代性和必要性。     

中国洪水预报系统在贝江勾滩洪水预报中的应用

采用中国洪水预报系统的应用平台建立贝江勾滩水文站降雨径流模型洪水预报方案,利用系统自动进行模型参数的率定,该方案在精度的评定及实际应用中取得较满意的效果,解决了勾滩站长期没有洪水预报方案指导防洪的迫切的问题,为中国洪水预报在柳江流域的应用积累了经验.     

Trust fraud: A crucial challenge for China’s e-commerce market

Currently, China’s e-commerce market is growing at an unprecedented pace, however, it is faced with many challenges, among which the trust fraud problem is the biggest issue. In this article, we use Taobao as an example and conduct a thorough investigation of the trust fraud phenomenon in China’s e-commerce market. We present the development history of trust fraud, summarize its unique characteristics, and explore the reasons why so many sellers commit fraud. We further propose a dynamic time decay trust model that aims to deter trust fraud by raising its cost and promote the growth of small and medium-sized sellers. The model utilizes detailed seller ratings as the data source, and incorporates a transaction amount weight, a time decay coefficient, and three trust factors in the calculation of trust. We test the model on real transaction data from Taobao, and the experimental results verify its effectiveness. Our proposed trust model yields a practical approach to online trust management not only in the Taobao market but also for other e-commerce platforms.