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任何事物都要经历一个产生、发展、衰亡的过程。“推陈出新”、“除旧布新”是宇宙间普遍的、永远不可抗拒的规律。同样,科学知识的增长过程是由知识的“叠加”和“更新”两方面所构成的。随着时间的推移,科学技术由不完善到完善,从不成熟到成熟,进而达到一个更高的层次。作为记述和反映科学技术生产活动的科技档案必定存在着一个新陈代谢的过程。老化、衰亡正是其运动、变化、发展的必经之路。目前,描述文献内容老化规律的数学公式一般都采用C(t)=ke-at+b的负指数函数形式[式中C(t)表示t时间产生文献的引用频率;k是常数,随专业领域不同而异;e是自然对数
Everything must go through a process of emergence, development and decline. “Put forth new ideas” and “save new cloths” are universally and forever irresistible laws in the universe. Similarly, the growth of scientific knowledge is made up of both “superposition” and “renewal” of knowledge. With the passage of time, science and technology have gone from imperfection to perfection, from immaturity to maturity, and then to a higher level. As a record and reflect the scientific and technological activities of the scientific and technological archives there must be a metabolic process. Aging, the decline is precisely the movement, change, the only way to develop. At present, the mathematic formula describing the aging law of the content of a document generally adopts the form of a negative exponential function of C (t) = ke-at + b [where C (t) denotes the reference frequency of documents generated at time t; k is a constant, The field varies; e is the natural logarithm