近些年来,美、英、日等国自然科学学会主办的期刊,全部或部分的同时编辑出版印刷型和网络电子型,大幅度提高了期刊的电子化程度,为图书情报服务部门开展期刊电子情报服务提供了较为丰富的网上期刊资源。而且,这些期刊大多具有很高的学术性、理论性和实用性,影响因子大,高价刊多,颇有深入研究的价值。 In recent years, the journals sponsored by the Natural Science Society of the United States, Britain, Japan and other countries have simultaneously or completely edited, printed, printed and networked electronic journals, greatly increasing the electronicization of journals and launching journals for the library information service Intelligence services provide a wealth of online journals resources. Moreover, most of these journals are highly academic, theoretical and practical, with a large impact factor and high prices. They are quite valuable for further research.