1.RFID application RFID is mainly composed of tags, readers and related application systems. RFID is a network system that uses electromagnetic spectrum to transmit specific identification information in a non-contact, non-visual and highly reliable manner. RFID system in the field of library management applications, updated the traditional bar code technology and security mechanisms to speed up the process of library automation, but also for the construction of digital libraries provides a hardware platform. 1) management automation The "Intelligent Collection System" of Cheng Yi College Library includes a series of automated management systems including librarian service system, chip conversion system, self-service borrowing system, self-service bookkeeping system, collection inventory system and channel detection system. There are about 420,000 books in our library, each with an RFID tag. The RFID inspection machine was installed at the exit of the library. The RFID inspection machine raises an alarm when someone leaves the library carrying unlabeled RFID-tagged books or other media material. If anyone tries to get rid of the alarm and take the books away, the library can still track the books and put them back in place. 2) Advanced service mode (1) After the reader enters the library, he can first retrieve the books on the self-service device. Borrowing books is self-help, the reader will pick a good book in front of the automatic borrow machine, and pay their own "card", the machine will automatically scan, and then print the receipt slip. When the book is returned to the book as long as the book is automatically returned to the book "vote" at the Department, the system will automatically identify books and processed. In the borrowing and returning books, the staff involved in very little time. (2) Counter workstations can handle loan and paperwork at the same time, and can handle other more complex tasks such as renewal and fines. (3) Self-service inquiry system outside the library is available 24 hours. E-books and periodicals to read, find electronic information are very convenient. (4) RFID detection door system is stable (not affected by the environment). (5) when the inventory, the librarian only handheld inventory system can be read on the bookshelf traverse, inventory time is very short, the original need a few months a few months of workload, a person can be completed in half a day, at the same time It is easy to find books that are out of bookshelf or chaos, save manpower and material resources greatly, and give employees more time to help readers or add more services. 2.RFID and bar code technology comparison Bar code is a widely used automatic identification technology, the current application of the library is mostly bar code technology, but now many foreign libraries are gradually applying RFID technology. RFID has the following features: no light source, can read data through external materials; long life, can work in harsh environments; can easily be embedded or attached to different shapes and types of products; read farther; can Write and access data, write less time than the print bar code; the contents of the label can be dynamically changed. RFID tag has more advantages than bar code: (1) data can be updated: the bar code can not be changed after printing, RFID tags can not limit the number of new, modify, delete the data stored in the label. (2) to facilitate data identification: bar code reader at close range and no object barrier, to make the scanning light source is illuminated on the bar code to read, RFID tag as long as the radio wave range, you can send signals. (3) large storage capacity: one-dimensional bar code is 50 bytes, the maximum capacity of two-dimensional bar code can store 2 to 3000 bytes; maximum capacity of RFID tags can reach several megabytes. (4) reusable: the bar code ends with the end of the life of the product; RFID tags because of their own information can be updated, it can be reused. (5) scanning speed, can read several data at the same time: bar code reader can only read a single bar code data; RFID tag identification device can identify five labels at the same time. (6) good security: RFID tags are read password protection, high security precautions so that it is not easy to be forged. (7) Durability: The bar code of the traditional paper or plastic material is sometimes hard to identify due to rain or damp environment and the damage caused during transportation. RFID has reusable hundreds of thousands or even millions of times more than the characteristics of the material can also be placed in a more harsh environment, so more durable than the bar code, the natural cost is also more savings. (8) small size: the traditional magnetic bar code limited to the volume, not easy to embed in smaller items. RFID is not the case, its mini volume can be hidden inside a variety of items. 3.RFID technology to the library benefits (1) The application of RFID brings tremendous vitality to the management system of the library: it simplifies the operation process, accelerates the counting efficiency and improves the effective management of the bookshelf; the reader can automatically borrow (Yet) the book and effective management of personnel efficient, establish the library as a knowledge dissemination center or information dissemination center image. (2) Save Money: The use of RFID system, on the one hand, saves the fund of library, improves work efficiency and enthusiasm of employees and reduces the cost of human resources; on the other hand, it improves the work environment of library staff, Reduce staff engaged in mechanical repetitive work. Alumina ceramic disc mainly used in faucet valve, water diverter as a key component of sealing system. 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Application of RFID in University Library