First Google school, then http://isiknowledge.com Here are some specific comments
1、 Google Academic Search: http://scholar.google.com/
Although it is still a beta version, I think it is very good and powerful now, Google Academic Search filters out a large amount of junk information in ordinary search results, ranking different versions of articles and the number of times they are cited by other articles. What is slightly insufficient is that the results of its search are not ranked in order of authority (such as influence factors, number of citations). The first few pages of articles searched in China may be mostly articles from some Chinese journals.
2. Universal search: http://qns.cc/
Rising star, a good assistant to scientific researchers, 90% of the students and teachers on this website are engaged in scientific research. Its dictionary search integrates the best online English Chinese writing and scientific research dictionaries on the market at present, and it is quite convenient to use this search engine to write English papers; Its literature search integrates the best database at present.
3、 Scirus ： http://www.scirus.com
Scirus is one of the most comprehensive and comprehensive scientific and technological literature search engines on the Internet. Developed by Elsevier Science Press, Scirus is used to search journals and patents, with good results! The disciplines covered by Scirus include: agriculture and biology, astronomy, biological science, chemistry and chemical engineering, computer science, earth and planetary science, economy, finance and management science, engineering, energy and technology, environmental science, linguistics, law, life science, material science, mathematics, medicine, neuroscience, pharmacology, physics, psychology, Social and behavioral sciences, sociology, etc.
4、 BASE ： http://www.base-search.net/
BASE is a multidisciplinary library developed by Bielefeld University in Germany Academic search engine , providing integrated retrieval services for global heterogeneous academic resources. It integrates the library catalogue of Bielefeld University Library in Germany and the data of about 160 open resources (more than 2 million documents).
5、 Vascoda ： http://www.vascoda.de/
Vascoda is the prototype of an interdisciplinary portal website, which focuses on the aggregation of specific topics and integrates library collections, literature databases and additional academic content.
6、 Goole ： http://www.goole.com/
Compared with Google, we can find some good things that Google can't find. It has a simple interface, powerful functions and fast speed, YAHOO、 NetEase has adopted its search technology. You can have a try.
7、 A9 ： http://www.a9.com
Google is a search engine at the same level. It was launched by Amazon.com, Web result is based on Google, so it is guaranteed to be at the same level as Google. In addition, Amazon's search in books function and personalization function are added; It mainly records your search history. It is still beta now, but I feel very good after the trial and recommend it to everyone. However, there is no Chinese content in the book search.
8、 Ixquick ： http://www.ixquick.com
Strictly speaking, it is not a search engine, but an information overpass connecting search engines and network users. A new generation of search engines came into being, Ixquick meta search is the most brilliant new star at present. But for most domestic users, Ixquick is still very strange. I will not introduce Ixquick's many unique functions one by one, but only the search database password that we care about most.
Usage: 1. Enter Ixquick first, and take the Proquest database as an example. 2. Fill in Proquest Username Password History Online and click search to see the results, The username and password of proquest stand out. Don't worry. Look at the fourth result "HB Thompson Subscription Online Databases", that is http://homework.syosset.k12.ny.us/onlinedbs/HBTDatabases/. 3. After entering, you will find that this is a password page. Select the Magazine&Journals column, and you will find EBSCO Electric Library Elementary、 Electric Library Elementary、 ProQuest Platinum (in school)、 Passwords for ProQuest Platinum (remote) and many other databases include uesrname and password. Try EBSCO casually, OK， Successfully logged in.
9、 Vivisimo ： http://vivisimo.com/
The works of cmu classify the search content, so that you can effectively make choices and have more characteristics. It can realize classified retrieval, and the retrieval speed is also very good. For example, EBSCO passwords can be found in a lot of minutes. http://search.epnet.com/ User ID: mountain Password: ridge This password can be tried.
10、 Find Articles ： http://www.findarticles.com/
A good tool for retrieving free paper. After entering the website, you can see that it has three functions, Driectory web article, in which article is very helpful to us. You can try to enter the article you are looking for, and there will be many discoveries! Information Find Articles provides tens of millions of papers in a variety of top journals, covering art and entertainment, automobile, commerce and economy, computer and technology, health and fitness, news and society, science education, sports and other aspects. Most of them are free full-text materials, which are easy to retrieve.
11、 Sciseek ： http://www.sciseek.com/Sample
I don't think it is very useful, and the content is not too much. The search engine that mainly relies on users to add websites and provide information has poor search function. Input common keywords, and often can't find matching content. SciSeek is a search tool focusing on science and nature. It provides scientific journals and other information in agriculture, forestry, engineering, chemistry, physics and environment by manual collection and processing.
12、 Chmoogle ： http://www.chmoogle.com
Click now or jump to http://www.emolecules.com In this search engine, more than ten million kinds of chemical information or corresponding suppliers can be searched, which is somewhat similar to Chemlink, but the chemical physical and chemical information provided is not as detailed as Chemlink. The difference between this search engine and Chemlink is that it can provide structured search for chemicals (there is a search box for online drawing of chemical structure on the home page).
13、 OJOSE ： http://www.ojose.com/
OJOSE (Online Journal Search Engine) is a powerful free scientific search engine. Through OJOSE, you can find, download or purchase resources of nearly 60 databases. But the operation is complicated.
14、 ResearchIndex ： http://citeseer.ist.psu.edu/
ResearchIndex searches academic papers in Postscript and PDF file formats on the Internet. At present, more than 500000 papers can be retrieved in its database. It mainly involves the field of computer science, including Internet analysis and retrieval, digital library and citation index, machine learning, neural network, speech recognition, face recognition, meta search engine, audio/music, etc. ResearchIndex provides a completely free service online (including downloading full text in PS or PDF format)
15、 http://hpsearch.uni-trier.de/ The expert's personal homepage search engine may not work.
16、 cnpLINKer ： http://cnplinker.cnpeak.com/
In order to provide readers and users with a convenient and fast comprehensive network platform to consult various foreign journals and literatures, China Library Group Corporation organized the development of the cnpLINKer (cnpiece LINK service) online database retrieval system, which was officially put into operation. CnpLINKer is the "China Library Linking Service", which currently mainly provides the query and retrieval of the contents and abstracts of about 3600 foreign journals, electronic full-text links, and the query of domestic collections of journals. It also keeps the data content consistent and up-to-date with foreign publishers Comment: It only provides the function of foreign language retrieval, but cannot get the full text. Personally, I don't think it is ideal. ¬
17. Guoxue: http://www.guoxue.com/dunhuang/
At present, Guoxue website can provide retrieval and reading of ancient cultural books from the Pre Qin Dynasty to the end of the Qing Dynasty. The content involves classics, history, children and collections.
18、 INFOMIN ： http://infomine.ucr.edu/
INFOMIN is a restricted search engine established by librarians of the University of California, Wake Forest University, California National University, University of Detroit and other universities
。 It mainly provides online academic resources for university staff, students and researchers It is free for all users, but the resource sites provided by it are not all free. Whether they can be used for free depends on whether the user's library has the right to use the resource.
19、 Intute ： http://www.intute.ac.uk/
Intute is a free, convenient and powerful search tool developed and established by the Joint Committee on Information Systems (JISC) and the Arts and Humanities Research Committee (AHRC) under the British Higher Education Funding Council, focusing on online resources in teaching and research.
20、 OAIster ： http://www.oaister.org/ Or http://www.oclc.org/oaister/
OAIster is an excellent open access search engine developed and maintained by the University of Michigan. It has collected 5.9 million documents from 536 academic institutions, including articles, working papers, discussion articles, conference papers and dissertations in open use journals.
21、 Information Bridge ： http://www.osti.gov/bridge/
The Information Bridge is a search tool developed and maintained by the Science and Technology Information Office (OSTI) of the Department of Energy (DOE). It provides full-text literature and catalog index of research achievements of the DOE since 1994. The disciplines involved include physics, chemistry, materials, biology, environmental science, energy technology, engineering Computer and information science, renewable energy, etc. The retrieval function includes basic retrieval and advanced retrieval.
22. Wanfang Data ilib: http://scholar.ilib.cn/
Information Wanfang Data ilib is a professional academic search platform under Wanfang Data Co., Ltd., which belongs to Wanfang Data Resource System. It's Google Scholar and Yahoo! Qimo academic search is an important content provider, with an average of more than 50000 new articles every week. Information ilib provides three search forms: general search, keyword search, and browsing by discipline classification. The search results show detailed information such as title, author, source, year, keyword, abstract, and references, but the full text requires payment.
Common academic search websites:
1. China Science and Technology Paper Online: http://www.paper.edu.cn/index.php You can search and download papers directly.
2. Duxiu Academic Search: http://edu.duxiu.com/
Reading show book search is a global book search engine. Internet users can search the title information, catalog, and full text content of books through reading show, and find the books and content they want to read quickly and conveniently. It is a truly knowledge-based search engine. Now, there are more than 1.9 million kinds of Chinese book title information in the show, and the amount of information that can be searched is more than 600 million pages, and this number is growing at the rate of about 500000 pages per day. ReadShow allows online users to read all the contents of some books without copyright restrictions. For copyrighted books, you can read their detailed bibliographic information, catalog and a small amount of content preview online.
3. Baidu Library: http://wenku.baidu.com/
"Baidu Library" is an open platform for netizens to share documents online. Here, users can read and download materials related to courseware, exercises, examination question library, paper reports, professional materials, various official document templates, legal documents, literary novels and other fields online.
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