1. Subject field: This is the most common classification method. Scientific journals are usually classified according to the subject areas of research, such as physics, chemistry, biology, medicine, earth science, engineering and so on. For example, Nature and Science are two interdisciplinary journals, covering all fields of natural science.
2. Research methods: Some scientific journals focus on a specific research method, such as experimental research, theoretical research, computational simulation, etc. For example, Experimental Fluid is a journal that publishes the research results of experimental fluid mechanics.
3. Publishing cycle: Sci-tech periodicals can also be classified according to the publishing cycle, such as weekly, monthly, quarterly and annual. For example, Cell is a weekly biology magazine.
4. Impact factor: Impact factor is an important indicator to measure the impact of sci-tech journals, and journals with high impact factor usually represent the top research results in this field. For example, TheLancet is a medical journal with high impact factors.
5. Open access: With the development of science and technology, more and more scientific journals begin to provide open access services, that is, readers can read and download articles in journals for free. For example, PLOS is an open access scientific journal.
The above are some common classifications of sci-tech journals. Different classifications can help researchers find their interested research fields and journals more quickly and accurately.