The law of wheel/rail contact irregularity induced by different point hiding structures and wheel treads was investigated by taking a No.

The paper introduces association rules mining and Apriori algorithm, applies the Apriori algorithm in the circulation data of university library, and from the angle of readers demand, mines some associations, which provides some theoretical foundations for book purchase and optimizes the collection structure of library.

This paper makes investigation and analysis on readers borrowing situation of the library of Guangdong University of Foreign Studies,and points out the problems existing in library s collection,and advances some suggestions on perfecting the collection structure.

Taking Tangshan College library as an example,the paper systematically discusses the features and general plan of local college libraries collection structure and the great significance of the optimizing collection structure to the whole construction of document information resources in terms of the subject structure,hierarchical structure,temporal structure and document-type structure.

This paper makes comprehensive statistic of recent years development of stocked literatures and condition of readers information requirement of university library and, with the concrete statistic data of the library of Nantong Teachers College, probes into the coincidence theory between readers information requirement and stock structure.

The position,content,recombination and the quality of the personnel of the libray construction in polytechnic school under the category of vocational education are expounded and ideas of the basic concept of optimizing the library structure and the specific way are put forward.

This paper probes into the relationship between the course proportion and thespecialized arrangement in our library structure, inquires into what our readers require,and also puts torward several proposals about the improvement of our library structure.