1, Willie InterScience.

It contains more than 360 journals in science, engineering technology, medical fields and related professions, more than 30 large-scale professional reference books, 13 laboratory manual and the full text of Wiley academic books on more than 500 topics.

2、EBSCO .

EBSCO has published electronic publications since 1986, and * * * has collected more than 4,000 indexed and abstract journals and more than 2,000 full-text electronic journals.

3. springer.

Springer and EBSCO/Metapress have started Springer LINK electronic periodical service. Life science, medicine, mathematics, chemistry, computer science, economy, law, engineering and environmental science.

Correlation extension

Thesis is a Chinese word, and its pinyin is lùn wén, which is a common word in classical literature and refers to conversation or exchange of ideas.

Nowadays, papers are often used to refer to articles that conduct research in various academic fields and describe academic research results, which are referred to as papers for short. It is not only a means to discuss problems in academic research, but also a tool to describe academic research results in academic exchanges. Including academic papers, graduation papers, dissertations, scientific papers, achievement papers and so on.

In order to explore and master the writing rules and characteristics of papers, it is necessary to classify papers. Because the content and nature of the paper itself are different, the research fields, objects, methods and expressions are different, and the classification methods of the paper are also different.

Papers can be divided into theoretical papers, experimental papers, descriptive papers and design papers according to the nature of content and research methods.