There is no restriction on. Special issues materials publishes special issues to create collections of papers on specific topics, with the aim of building a community of authors and readers to discuss the latest research and develop new ideas and research directions Special issues are led by guest editors, who are experts on the topic and all special issue submissions follow mdpi's standard editorial process 很推荐这个杂志。审稿人和编辑的处理速度都是很理想的。但期刊对于文章的质量把控要求并不如人们所说那么低，感觉近年来 materials 的审稿质量越来越高，并不是那么好中。四个审稿人给了将近60条意见，都很中肯，还有要求系统性的补充实验数据，其实我觉得自己的文章已经很系统，按照审稿. Polymeric materials section quantum materials section mechanics of materials section green materials section please note that the order in which the editors appear on this page is alphabetical, and follows the structure of the editorial board presented on the mdpi website under information for editors Open access — free for readers, with article processing charges (apc) paid by authors or their institutions
Indexed within esci (web of science), scopus and other databases. In addition, research materials necessary to enable the reproduction of an experiment should be indicated in the materials and methods section Individual journal guidelines can be found at the journal ‘instructions for authors’ page Data sharing policies concern the minimal dataset that supports the central findings of a published study. npj系列影响因子最高的是我所在领域（medical informatics）的 npj digital medicine，常年稳定在15分左右，在该分类里排第二，仅次于lancet digital health。 因为medical informatics这个领域基本发不了正刊子刊，所以npj digital medicine是毫无疑问的领域top，我们圈内基本都认可它的子刊含金量。 npj别的期刊不了解。
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