1. 1. The differences between the three search tools of EI, CA and WPI in the scope of included subjects, document types and search methods:
(1) EI:
1. The Engineering Index (EI) in the United States was founded in 1884. It is a famous comprehensive retrieval tool for engineering technology published by Engineering Information Inc. in the United States. EI Search publishes one issue every month, with 13,000 to 14,000 abstracts; each issue is accompanied by a subject index and author index; an annual volume and an annual index are also published every year, and the annual index also adds an author unit index. The included documents cover almost all fields of engineering technology. For example: power, electrician, electronics, automatic control, mining and metallurgy, metal technology, machinery manufacturing, management, civil engineering, water conservancy, educational engineering, etc. EI search has the characteristics of strong comprehensiveness, wide source of data, wide geographical coverage, large amount of reports, high quality of reports, and strong authoritativeness.
2. Scope of disciplines:
(1) Engineering papers with high academic level, including the following disciplines:
——Mechanical engineering, Mechanical and electrical engineering, shipbuilding engineering, manufacturing technology, etc.;
——Mining, metallurgy, materials engineering, metal materials, non-ferrous metals, ceramics, plastics and polymer engineering, etc.;
—— Civil engineering, construction engineering, structural engineering, ocean engineering, water conservancy engineering, surveying and mapping engineering, earth science, etc.;
——Electrical engineering, power plant, electronic engineering, communications, automatic control, computer, computing technology, software , aerospace technology, etc.;
——Chemical engineering, petrochemical industry, combustion technology, biotechnology, light textile industry, food industry;
——Engineering management.
(2), National Natural Science Foundation-funded projects, scientific and technological projects, "863" high-tech projects, etc.
(3). The paper reaches the international advanced level and the results are innovative.
EI does not include papers purely on basic theory.
2. Document type
(1) Printed type. Including a. "Engineering Index Monthly"; b. "Engineering Index Annual"; c. "Engineering Index Cumulative Index".
(2) Microform
(3) Machine-readable
(4) Network
4. Search methods:
(1) Topic approach;
(2) Author approach;
(2) CA:
1. American Chemical Abstracts ", founded in 1907, is edited and published by the American Chemical Abstracts Service (CAS). CA is a well-known world-wide search tool that covers the widest range of subject areas, collects the most complete types of documents, provides the most search methods, and has the largest volume. It reports on 16,000 scientific and technological journals, scientific reports, conference papers, theses, information compilations, technical reports, new books and audio-visual materials published in 56 languages ??from more than 150 countries in the world. It also reports on 30 countries and 2 international organizations patent documents. The included documents account for 98% of the world's total chemistry and chemical engineering literature, with a volume of 500,000 documents per year.
2. Subject scope: CA coverage covers almost all fields of interest to chemists, including inorganic chemistry, organic chemistry, analytical chemistry, physical chemistry, polymer chemistry, and metallurgy. , geochemistry, pharmacology, toxicology, environmental chemistry, biology, physics and many other disciplines.
3. Document type: (1) Print type; (2) CD type; (3) Online version.
4. Search methods: (1) keyword index; (2) author index; (3) patent index;
(4) chemical substance index.
(3) WPI: Founded in 1948 by the British Derwent Publishing Company, it is the world's largest private organization engaged in publishing patent documents, including various patent catalogs published by various countries. , abstracts, cumulative indexes and other patent search tools.
1. Scope of included subjects: patent documents in all subject areas of major industries in all countries in the world.
2. Document type: patent.
3. Search method: Find the first-level directory to which it belongs based on the technical topic, and then search one by one according to the directory it belongs to.