There seems to be something wrong with this question. Different database fields have different emphases. It's best to explain your field. Emerald Database: Emerald Management Xtra 150(EMX 150)- Complete Works of Emerald Management, ACS(AmericanChemicalSociety): founded in 1876, AIP, APS: american physical society (APS), the world's largest science and technology association, with worldwide ownership. It publishes the core journals of physics, and has gained a considerable reputation in the field of physics, with high academic reference value. Project Village 2: Compendex Database (EI online edition) is the most comprehensive secondary literature database for engineering retrieval in the world, including references and abstracts of more than 7 million papers in 5, 1000 engineering journals, conference proceedings and technical reports. CADAL (China-US Digital Library): EBSCO:EBSCOhost, one of the three systems of EBSCO Company in the United States, is used for database retrieval. Elsevier electronic journal full-text database: it is one of the largest publishers of scientific and medical literature in the world, with a history of 180 years. ScienceDirect system is the core product of Elsevier Company, FirstSearch. This is an online reference service system of OCLC. Through this system, more than 70 databases can be retrieved. CALIS National Engineering Center began to order Springer full-text database from 1999. Springer is a world-famous science and technology publishing company. Providing online services for academic journals and e-books through SpringerLink system. SIAM: Institute of Industrial and Applied Mathematics (SIAM) was established in the early 1950s and published 65,438+03 journals of applied and computational mathematics. These peer-reviewed research journals cover the whole field of applied mathematics and computational mathematics, with rich and comprehensive contents. WorldSciNet is an electronic periodical publishing website of WorldScientificPublishing in Singapore. WorldSciNet currently provides 58 full-text electronic journals, covering mathematics, physics, chemistry, biology, medicine, materials, environment, computer, engineering, economy, social science and other fields. JohnWiley database: SonsInc, founded in 1807, is one of the oldest and most famous academic publishing houses in the world. LexisNexisAcademic Encyclopedia: a professional information resource system designed by the American Committee of Library Experts and evaluated and screened by professional librarians to provide services for academic libraries. This information resource includes more than 6 100 full-text resources, including news, newspapers, periodicals, publications, characteristic database systems and other large information providers. The database of the British Physical Society (IOP) is an international academic association and professional organization, and has published the following world-renowned academic journals: the British Physical Society, the Chinese Physical Society, the European Physical Society, the German Physical Society, the European Optical Society, the International Bureau of Metrology, the London Mathematical Society, the International Atomic Energy Agency, the Royal Swedish Institute of Science, Radiation Protection Society, and the SciFinderScholar (online version CA): SciFinder Scholar is CA (online version CA). It includes research results published in more than 9500 major journals and patent documents of more than 50 legal patent issuers around the world. NSTL supports foreign language online journals. The National Science and Technology Documentation Center supports the introduction of a variety of foreign periodicals, which are provided to our school for free, including 7 periodicals of the Royal Society. Maney published 27 online periodicals in the UK, and IEEE/IEEE electroniclilibrary (IEL for short) is the electronic full-text database of all publications of American Institute of Electrical and Electronics Engineers (IEEE) and British Institute of Electrical Engineers (IEE). Review of Biological Sciences (2004-present): (abbreviated as BP) was compiled by BIOSIS. MEDLINE( 1950- Up to now) is the largest life science abstract and index database in the world, and it is a medical literature analysis and retrieval system. Nature, a famous British magazine, is the earliest international sci-tech periodical in the world. Since 1869 was founded, it has consistently reported and commented on the most important breakthroughs in the global science and technology field. ..... (more)