In a university library, students and faculty visit frequently to borrow books. The interactions between people and books indicate their current reading patterns. We analyze loan data on books in a university library, observing two aspects of book-borrowing behavior: returning them before the due date, and after it. We observe a steady distribution in the book-returning probability, modulated by weekly periodicity. After the due date, the probability distribution of the holding time shows power law behavior. The periodicity and power law were observed, regardless of borrowers being undergraduate students, graduate students, or faculty. We also observe power law behavior in the probability distribution for inter-event distribution between book loans. We can explain the power law relationship for the holding time of a book as a queuing model of job priorities.

在大学图书馆，学生和教职员工经常拜访借书。人与书之间的互动表明了他们当前的阅读模式。我们分析大学图书馆中图书的借阅数据，观察图书借阅行为的两个方面：在到期日之前和之后归还它们。我们观察到返书率的稳定分布，并受到每周周期的调节。到期日之后，保持时间的概率分布显示幂律行为。无论借款人是本科生，研究生还是教师，都遵守周期性和幂律。我们还观察了在书借之间的事件间分布的概率分布中的幂律行为。