从世界排名的变化看乒乓球技术的发展方向

在国际乒坛涌现出的三名年轻优秀男子乒乓球运动员的世界排名攀升过程中,分析了11分制实施前和实施后这些优秀运动员世界排名的升降特点和技术风格,从中简要预测今后乒乓球技术的发展方向和趋势.     

定价机制转型对铁矿石价格波动的影响

中国是世界铁矿石第一进口国和消费国,然而长期以来面临着定价权缺失问题。通过定价机制改革,掌握铁矿石定价权是保障中国资源安全战略的重要科学问题。文章以2009年铁矿石由长期协议定价机制向短期协议定价机制改革为参考点,采用以断点回归模型为核心的研究方法,选取2005年7月至2019年3月的相关月度数据,对铁矿石定价机制改革与中国铁矿石进口价格波动的因果关联进行实证分析。结果表明：①短期协议定价机制的引入与国内进口铁矿石价格波动密切相关,在短期内能有效抑制价格的大幅上涨,经测算,定价机制转型能够降低国内进口铁矿石价格6.06%~18%;②短期协议定价机制改革在短期不能抑制国际铁矿石价格;③在定价机制冲击铁矿石进口价格过程中,内生性因素影响较小。基于以上结论,本文建议应继续加大对短期定价机制的创新力度;发挥中国铁矿石短期定价机制改革的羊群效应,以协同增加同铁矿石供应商协商的议价权;针对国际市场变化情况灵活调整定价机制,强化在国际铁矿石市场的议价能力。     

Isobaric vapor-liquid equilibrium for toluene, 3-methylthiophene and N-formylmorpholine at 101.33 kPa

Isobaric vapor-liquid equilibrium(VLE)data were measured for binary mixtures of toluene+N-formylmorpholine,toluene+3-methylthiophene and 3-methylthiophene+N-formylmorpholine at 101.33 kPa.The VLE data ...     

世界一流大学与一流学科关系探析——基于软科2019年排行榜的分析

以软科公布的2019年世界大学学术排名与世界一流学科排名为依据,对世界一流大学拥有的世界一流学科数量以及世界一流学科在各大学和各学科领域的分布情况进行统计。统计表明:世界一流大学通常在多个学科领域拥有较多的世界一流学科;世界一流学科也大多分布在世界一流大学中。近年来,我国高校无论在世界大学学术排行榜上,还是在世界一流学科排行榜上都取得了显著进步。整体上,我国拥有世界一流学科的高校较多,世界一流大学较少;我国的世界一流大学拥有的世界一流学科在数量上有一定优势,但学科领域的分布不均衡,世界一流学科主要集中在工学领域。“双一流”建设后续进程中应适当调整一流大学建设与一流学科建设的关系,强化学科发展的均衡性,从重点关注一流学科“点”的建设到更加关注大学的综合能力建设。     

人民币汇率及其波动对中国主要贸易伙伴进出口影响研究

本文利用AR-GARCH模型,协整检验和误差修正模型,对海关总暑提供的2001年1月互2010年6月中国对东盟、日本、美国、欧盟、韩国、中国香港六个主要贸易伙伴的月度进出口数据进行实证研究.从人民币实际汇率变化,汇率波动率对我国和各贸易伙伴进出口贸易的长期和短期影响进行分析,比较了汇率因素对各个贸易伙伴影响.研究结果表明,长期看来人民币实际有效汇率和多数贸易伙伴的出口显著负相关,没有与其正相关的贸易数据;其波动率可能有多种长期效果.短期看人民币实际有效汇率对与欧盟,东盟,香港出口有反向冲击作用,对韩国进口有正向冲击作用,其波动率对部分贸易伙伴的进出口贸易存在正向冲击.     

挥发窑低温砖由斧头式改为刀口式可行性研究

对于以燃煤或者焦碳为主的能耗大户挥发窑来说,如何降低成本,成为冶炼工作者关心的问题之一。文章简述了挥发窑的基本结构,通过从窑内衬砖出发,对挥发窑低温带用砖进行分析,研究斧头式低温砖更改为刀口式的可行性以及风险和隐患。     

How journal rankings can suppress interdisciplinary research: A comparison between Innovation Studies and Business & Management

This study provides quantitative evidence on how the use of journal rankings can disadvantage interdisciplinary research in research evaluations. Using publication and citation data, it compares the degree of interdisciplinarity and the research performance of a number of Innovation Studies units with that of leading Business & Management Schools (BMS) in the UK. On the basis of various mappings and metrics, this study shows that: (i) Innovation Studies units are consistently more interdisciplinary in their research than Business & Management Schools; (ii) the top journals in the Association of Business Schools’ rankings span a less diverse set of disciplines than lower-ranked journals; (iii) this results in a more favourable assessment of the performance of Business & Management Schools, which are more disciplinary-focused. This citation-based analysis challenges the journal ranking-based assessment. In short, the investigation illustrates how ostensibly ‘excellence-based’ journal rankings exhibit a systematic bias in favour of mono-disciplinary research. The paper concludes with a discussion of implications of these phenomena, in particular how the bias is likely to affect negatively the evaluation and associated financial resourcing of interdisciplinary research organisations, and may result in researchers becoming more compliant with disciplinary authority over time.     

Evaluating university performance using reference point based composite indicators

In this paper, we propose the application of a novel methodology to build composite indicators, in order to evaluate university performance. We analyse separately the three basic dimensions of our university system (research, teaching and technology transfer), because we are interested in getting a more accurate vision of each of them. In order to build the composite indicators, we use a multi-criteria analysis technique, based on the double reference point method. One advantage of this technique is the possibility to use reference levels, in such a way that the results obtained are easily interpreted in terms of the performance of the university with respect to these levels. Besides, aggregations for different compensation degrees are provided. In order to illustrate the advantages of this method, it has been applied to evaluate the performance of the public universities of the Spanish region of Andalucía, for year 2008. The results show that the performance of the Andalusian public universities in the teaching block is better than in the research and technology transfer blocks. The application lets us conclude that the methodology offers a warning system to assist in strategic decision making, and the values of the indicators allow us to find fields of improvement in all areas.     

中国大学综合实力排行榜排名方法的比较分析——基于高等教育机构排名柏林原则的视角

高等教育机构排名的柏林原则是国际大学排名机构的基本评价准则。以16项柏林原则为基准，以武书连榜、校友会榜、邱均平榜、软科榜的相关排名方法资料为比较分析对象，逐项对照、分析比较，给予五级等距吻合度评判。研究结果显示，武书连榜获4A、3D，校友会榜获3A、2D，邱均平榜获2A、3D，软科榜获4A、3D。基于对各排行榜的评判和对获得A级和D级的分析，对排名机构提出了两方面的建议：一是应参照柏林原则，自查自纠，改进排名方法，提高排名的规范性；二是应使用《IREG排名审计手册》开展自我审计，有条件者可向IREG学术排名和卓越协会申请排名审计。     

黄元帅苹果花中挥发性成份的GC/MS分析

采用GC／MS对黄元帅苹果花挥发油中的化学成份进行了分析，测得其挥发油含量为0．70％，挥发油中含10种化学成份，其中含醇类最多，为58．2％。