The Impact of Museum Purchase on the Auction Prices of Paintings

This study examines how art museumspurchasing policy influences the auction prices ofpaintings. Using a cross section of non-speculativetransactions during the period 1820–1970, we findconsiderable empirical support for the hypothesisthat public museums outside the U.S. pay above averageprices in auction markets providing higher thanaverage yields to private sellers. The typical U.S.private museums appear to be more restricted byfinancial constraints and the development of thegeneral economic conditions than their publiccounterparts.     

从Ei Village 2看我国二次文献数据库的发展趋向

本文对Ei Village 2的发展历程及成功经验进行了剖析,并对我国二次文献数据库的发展方向提出了建议.     

EI Village 2检索系统中RSS推送服务及其操作方法

本文介绍了目前流行于网络的信息推送技术RSS及RSS阅读器,同时以EI Village 2检索系统为例,介绍了RSS的订制及阅读方法.     

构建基于J2EE规范的数字图书馆模型的探讨

从软件工程的角度分析,数字图书馆实质是一个分布式管理信息系统。构建数字图书馆,就是构建一个分布式管理信息系统。J2EE的多层次的分布式应用模型和一系列开发技术规范,为构建数字图书馆平台提供了可靠保证。图1。参考文献11。     

高校图书馆教学/学习用书著录的探讨

教学／学习用书是高校图书馆馆藏的重要组成。教学／学习用书具有不同于其它文献的特点，高校师生的检索利用也不同于其它馆藏图书。为提高教学／学习用书的利用率，方便高校师生检索，本文探讨了高校图书馆在教学／学习用书著录时，机读目录格式中4--连接款目块的使用。     

COUNTER R5的新特性及对图书馆的影响

COUNTER是规范网络化电子资源使用统计报告数据处理、审核和提交的国际化标准,是图书馆电子资源使用量统计和评估的核心要素。目前COUNTER已经发布了最新版本R5,了解R5的新特性及与之前版本的不同对于图书馆的电子资源统计工作具有重要意义。本文拟从COUNTERR5的报告设置、报告的指标类型、数据类型、访问类型和其他完善报告的属性来解析R5,同时介绍R5对SUSHI收割的影响、"持续维护"的概念、R5发布对图书馆的影响和R5实施的重要时间节点,同时也对R5较之R4的发展和不同进行了比较和分析。COUNTERR5的主要关注点是一致性、清晰性和简单性,较之COUNTERR4有了明显的完善,同时包含了持续的维护过程,允许对代码进行更新而不必再引入一个全新的版本,解决了版本升级会对供应商和图书馆带来的各种时间和人员成本的影响。     

Technological research in the EU is less efficient than the world average. EU research policy risks Europeans’ future

We have studied the efficiency of research in the EU by a percentile-based citation approach that analyzes the distribution of country papers among the world papers. Going up in the citation scale, the frequency of papers from efficient countries increases while the frequency from inefficient countries decreases. In the percentile-based approach, this trend, which is uniform at any citation level, is measured by the e_p index that equals the P_{top 1%}/P_{top 10%} ratio. By using the e_p index we demonstrate that EU research on fast-evolving technological topics is less efficient than the world average and that the EU is far from being able to compete with the most advanced countries. The e_p index also shows that the USA is well ahead of the EU in both fast- and slow-evolving technologies, which suggests that the advantage of the USA over the EU in innovation is due to low research efficiency in the EU. In accord with some previous studies, our results show that the European Commission’s ongoing claims about the excellence of EU research are based on a wrong diagnosis. The EU must focus its research policy on the improvement of its inefficient research. Otherwise, the future of Europeans is at risk.     

Thermophysical properties of the regolith on the lunar far side revealed by the in situ temperature probing of the Chang’E-4 mission

Temperature probes onboard the Chang’E-4 (CE-4) spacecraft provide the first in situ regolith temperature measurements from the far side of the Moon. We present these temperature measurements with a customized thermal model and reveal the particle size of the lunar regolith at the CE-4 landing site to be ∼15 μm on average over depth, which indicates an immature regolith below the surface. In addition, the conductive component of thermal conductivity is measured as ∼1.53 × 10^–3 W m^–1 K^–1 on the surface and ∼8.48 × 10^–3 W m^–1 K^–1 at a depth of 1 m. The average bulk density is ∼471 kg m^–3 on the surface and ∼824 kg m^–3 in the upper 30 cm of the lunar regolith. These thermophysical properties provide important additional ‘ground truth’ at the lunar far side, which is critical for the future analysis and interpretation of global temperature observations.     

基于显著图融合的高分四号卫星光学遥感图像多运动舰船检测方法

高分四号(GF-4)卫星是目前世界上分辨率最高的静止轨道光学遥感卫星,它具有高时间分辨率、高空间分辨率和大成像幅宽等优点,可对指定区域进行连续观测.提出一种适用于GF-4卫星光学遥感图像的多运动舰船检测方法.首先,对遥感图像进行中值滤波去噪和非线性灰度拉伸;然后,通过谱残差法提取显著图;最后,使用基于加权Dempste...