RFID as a fast, long-range, non-contact automatic identification technology, has been successfully used in logistics management, transportation, e-government, license recognition and food safety and other fields. Some domestic and foreign universities and public libraries also introduced RFID technology in recent years and put it into practical application, achieving good economic and social benefits. With the development of Internet of Things technology, RFID has become more and more widely used in libraries. RFID technology application advantages RFID technology is not just a simple bar code substitute, but its systematic application will revolutionize the library's entire workflow, traditional services and management models, which in turn will lead to the reorganization of new business processes and the automation of libraries. , Service functions to further enhance. Compared with the traditional bar code plus magnetic stripe, its advantages mainly in the following four aspects: First, improve the efficiency of borrowing books The traditional bar code and magnetic stripe technology in the borrow, return the book, still need staff to open the title page of the book to find the bar code, and then scan and degaussing, borrowing and returning efficiency is relatively low. With RFID technology, the RFID smart tag reader reads information in a non-contact manner and, thanks to the anti-collision function of RFID technology, can read and identify multiple books at the same time, thereby improving borrowing efficiency and reader reception . The second is to improve the service level Through the self-service borrowing and borrowing equipment peripherals, readers can find the network where the books are located number, quickly and accurately find the required books, books for self-borrow, return procedures, to bring convenience to the reader. The library can readjust the human resources saved so that more librarians can shift from traditional management to serving readers or other value-added services. Third, strengthen the collection management In the open bookshelf, as a librarian, usually takes a lot of energy to find chaos, wrong books and books, and the classification of homing, the workload and the Department of work intensity is relatively large. By entering the shelf information of the book into the RFID system, the staff can find the information of the book in time through the hand-held reader during the daily touring, which makes the work of arranging and finishing the work very easy. In addition, the use of RFID technology can also simplify library books inventory management work. Fourth, strengthen the anti-theft monitoring capabilities Traditional magnetic anti-theft system often appear, such as false false alarm, degaussing not clean false alarm and many other non-real theft. The RFID access control system can be integrated through the reader to determine whether the books being checked for misleading or borrowing records omitted books, and then determine whether to make an alarm action, reducing the false negative rate and false alarm rate. Alnico magnets are traditionally classified using numbers assigned by the Magnetic Materials Producers Association (MMPA), for example, alnico 3 or alnico 5. Cast Alnico Magnet,Cast Alnico Block Magnet,Cast Sintered Alnico Magnet,Strong Cast Alnico Pot Magnet Jinyu Magnet (Ningbo) Co., Ltd. , https://www.magnetbonwin.com
Alnico magnets are produced by casting or sintering processes.[8] Anisotropic alnico magnets are oriented by heating above a critical temperature and cooling in the presence of a magnetic field. Both isotropic and anisotropic alnico require proper heat treatment to develop optimal magnetic properties-without it alnico's coercivity is about 10 Oe, comparable to technical iron, which is a soft magnetic material. After the heat treatment alnico becomes a composite material, named "precipitation material"-it consists of iron- and cobalt-rich[9] precipitates in rich-NiAl matrix.
Alnico's anisotropy is oriented along the desired magnetic axis by applying an external magnetic field to it during the precipitate particle nucleation, which occurs when cooling from 900 °C (1,650 °F) to 800 °C (1,470 °F), near the Curie point. Without an external field there are local anisotropies of different orientations due to spontaneous magnetization. The precipitate structure is a "barrier" against magnetization changes, as it prefers few magnetization states requiring much energy to get the material into any intermediate state. Also, a weak magnetic field shifts the magnetization of the matrix phase only and is reversible.
Alnico magnets are ideal for high temperature applications up to 550ºC
. Cast Alnico Magnet is very stable, has good corrosion resistance and a typical hardness of 50 Rockwell C. Once cast, the material is so hard that the only machining possible is grinding
. Cast AlNICo Magnet represents the most versatile magnet material available. The range of properties can be accurately designed for specific applications by changes to element analysis and heat treatment.
November 03, 2021