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科学技术的迅速发展,记载科学研究和技术进展的文献数量急剧增长。据国外报道,当前科学技术文献正以每分钟2000印张的速度在增长,全世界每年发表科技论文约300～400万篇,年增长率约为7～8％。不同学科,文献增长的速度不同,有些学科文献量每几年翻一番,有些学科文献量十几年翻一番,例如,化学化工文献的倍增期为8—9年。情报载体和形式也发生了变化,不但书面文献资料越来越多,声象资料和计算机阅读资料等新形式的
With the rapid development of science and technology, there has been a dramatic increase in the number of documents recording scientific research and technological progress. According to foreign reports, at present science and technology documents are growing at a rate of 2,000 printed sheets per minute. The world publishes about 3 to 4 million scientific and technological papers each year, with an annual growth rate of about 7 to 8%. Different disciplines and literature have different growth rates. Some academic documents double their numbers every few years, and some academic documents double in more than 10 years. For example, the doubling period of chemical and chemical literature is 8 to 9 years. Information carriers and forms have also changed, not only more and more written information, audio-visual data and computer readable data and other new forms