Does economic policy uncertainty affect cryptocurrency markets? Evidence from Twitter-based uncertainty measures

Using daily data from August 9, 2015, to July 7, 2020, this study examines the effects of economic policy uncertainty (EPU) on the returns of four cryptocurrencies: Bitcoin, Ethereum, Litecoin, and Ripple. To this end, two new measures of EPU (Twitter-based economic uncertainty and Twitter-based market uncertainty) are considered. A Granger causality test using the recursive evolving window approach shows a significant causality between the Twitter-based EPU measures and the BTC/USD exchange rate from October 2016 to July 2017. Moreover, a significant causality was noted from the EPU measures to the ETH/USD exchange rate from June 2019 to February 2020 and from the EPU measures to the XRP/USD exchange rate from January 2020 to February 2020. The Twitter-based EPU measures primarily positively affect the returns of the related cryptocurrencies during these periods. These results are robust to different measures of Twitter-based EPU and different econometric techniques. Potential implications, including the COVID-19 era, are also discussed.     

现代图书馆人本管理的运行机制

本文结合在现代图书馆的管理过程中出现的一些问题,阐述了"物本"管理模式的主要形式和存在的弊端和引进"人本"管理模式的优势,分析了引进人本管理的必要性和紧迫性,探讨了"人本"管理模式的整体运行机制。     

高职院校图书馆核心竞争力的智慧化提升策略研究

该文阐述图书馆核心竞争力的基本概念，分析当前高职院校图书馆的竞争对手现状，指出高职院校图书馆在竞争中落后于对手的一些问题，提出建设智慧图书馆以提升核心竞争力的策略。     

转向架存放库货架结构设计及有限元分析

为满足转向架检修的需求,在转向架检修库中特别设置一个立体存放库。由于国内目前没有转向架的立体存放库,故采用升降横移式立体车库的方式对转向架存放库货架结构进行了设计。通过有限元方法对货架进行分析与计算,在保证货架承载强度、变形和稳定性的要求下,将原来的壁厚8 mm的钢板改为6 mm,从而减轻了货架的质量,满足了仓储的需要。     

鄂伦春旗图书馆现状及创新发展的几点思考

位于呼伦贝尔市鄂伦春自治旗的鄂伦春图书馆承担着民族文化传承的重要责任。通过分析鄂伦春图书馆的现状和制约其发展的主要问题,对如何改变现状、更好的发挥社会职能做了几点思考。     

高职院校图书馆采编工作引入ISO9000后的改进效用探讨

目前,高职院校图书馆采编工作面临一些突出的现实问题,不仅影响到采编工作的质量效益和管理水平,也直接影响到图书、期刊与报纸等纸质资源的馆藏质量、广大师生读者满意率和图书馆窗口服务水平,引入ISO9000质量管理体系,并贯穿实施于整个采编业务的全过程,可以全面提升图书馆采编工作质量和管理水平。     

Unemployment in Greece: Evidence from Greek regions using panel unit root tests

The purpose of the paper is to examine the nature of Greek regional unemployment. The paper contributes to the literature assessing the stochastic properties of Greek unemployment rate in the context of the Greek regions by relying on various univariate and panel unit root tests. In particular, recently developed and more powerful panel unit-root tests that control for structural breaks, heterogeneity and cross-sectional dependence in the panel are employed. The results show that in all cases, after taking into account the fact that regional unemployment rates in Greece are subject to a structural break, the null hypothesis of a unit root is not rejected, indicating that the Greek regional unemployment series are non-stationary with the presence of a structural break.     

构建用户参与型数字参考咨询服务系统的探索

本论文以目前数字参考咨询服务的现状为起点,根据数字咨询的主要服务模式,对用户参与型数字参考咨询服务模式进行分析,并由此提出lib2.0下的用户参与型数字参考咨询平台的系统初步构想。     

微博时代的图书馆服务

从博客到微博,以互联网为媒介的沟通已然成为人们重要的互动沟通方式。本文主要探讨在这个微博盛行的时代,如何利用好微博,将图书馆存放、加工、生产出的知识产品更快、更有效的传播和利用起来,如何更好的开展图书馆的个性化服务。     

论图书馆人的图书馆精神

图书馆职业精神是图书馆工作实践中稳定的行为风尚。新时期赋予它新的内涵，应是公仆精神、科学精神、人文精神、进取精神、创新精神等的有机结合。构成稳定的图书馆职业思想行为风尚，树立和弘扬图书馆精神，是图书馆事业永远发展进步的科学保障。