| Literature Retrieval is a very troublesome task. It is generally performed by a variety of databases. However, since the purchased electronic databases only involve documents after 1997, the amount of literature is relatively small, in addition, many fields fall behind the research of 20-30 years abroad, and it is generally difficult to find out. Even if the source can be found, there is no original article. Document Search is a time-consuming and laborious task. You need to be careful, patient, and search for documents repeatedly. Here are some of my personal experiences on how to use the network for document search. ① Advanced features of search engines
The search engines www.google.com, scholar.google.com, and www.baidu.com are only slightly better at Chinese retrieval, and their English is very poor and of little use. Our commonly used Google focuses on web page retrieval, while schlar mainly searches academic literature in the format of PDF, and the reference to the paper will also be displayed, if you know the document name and author, you can easily find the PDF document. Generally, these two search engines must be used together.
Google's advanced search features include several common features: (1) Locking keyword search: If double quotation marks are used, such as "parking", all search results will contain content in double quotation marks to reduce the amount of search results; (2) file type retrieval: The main file types are .htm and .doc. Most of the foreign documents are published in pdf format. Many unnecessary search results can be ruled out using format restrictions, such as input: Parking filetype: PDF, of course, other formats recognized by Google can be used; (3) specify a URL for retrieval: If you find that a website has a required document, you can directly specify the website for retrieval to obtain the required information, for example, enter: parking site: www.parknride.com.
For detailed functions of Google, refer to Google's advanced search, which is the same for Baidu. ② Use of keywords
The search results are directly related to the use of keywords. Therefore, you must first find out the expressions of keywords in English and search them separately. For literature reviews, you can use: review, Overview, literature review, history, development, and trend are retrieved together with keywords. The keyword search is not determined at one time. You can select a few keywords at the beginning to see if they can be found. If you find some keywords, you should first look at the literature, after a deeper understanding of the content, I also increased my understanding of the search keywords, which is actually a process of constantly adjusting the search keywords. ③ Use of references
After retrieving some articles, you should first look at the references after the documents. The foreign documents are generally listed in detail. You can perform targeted searches based on the references, for example, you can find the journal of the specified database or retrieve the author. The author's personal homepage generally provides download (the best resource) for the author's own published documents, and some also provide the author's e-Mal, you can directly write a letter to the author, which is generally provided by the other party.
In addition, Google's powerful functions are used to search for paper titles, journals, and authors. The Journal search often finds that the journal is indexed by that database, and can be directly connected to the corresponding database, it is best to add keywords, years, and other information to narrow the search scope, and do not use abbreviations, will ignore a lot of information.
If you find an electronic database of a journal over the years, although the website has its own retrieval function, it is best not to give up the retrieval after retrieval. In fact, many documents may not be retrieved, you need to have a patient look at the first phase of the first phase (of course, this workload is not big, foreign journals generally about 10 per phase), but if you miss the required documents, the loss will be big. ④ Website backtracking
Generally, after finding the required information for a website, do not shut it down. There are usually many resources. One is to return to the upper-level directory of the document, that is, to delete the document name, retain the backslash and press enter, for example: Deleted.
Another method is that many books use chapter numbers, and you cannot see them using the above method. You can use the download software that supports resumable data transfer to download them in order of chapter numbers. For example:
Http://www.parknride/com/documents/ch01.pdf
You can change the value to bytes. ⑤ Search for relevant materials and resources through BBS Resources
There are a lot of resources on professional BBS that can be downloaded and you need to have patience to find them. However, many BBS Resources in China have credit restrictions. After finding useful information, you can use the search engine function to find it directly. ⑥ Use proxy
Foreign Universities have their own e-databases, some of which are free of charge. If there are restrictions, they have to use agents. Generally, such agents can be found only through professional BBS, domestic Good Literature Query resources BBS: online reading field www. readfree. ne and garden http://ldbbs.512j.com/bbs/. In addition, it is best to use myie for external use agents. |
