Applied Science & Technology Full Text™ contains indexing and abstracts for nearly 800 core English-language, scientific and technical publications back to 1983 as well as full text articles from more than 220 periodicals.
arXiv is a highly-automated electronic archive and distribution server for research articles. Covered areas include physics, mathematics, computer science, nonlinear sciences, quantitative biology and statistics.
Scopus is the largest abstract and citation database of peer-reviewed literature and quality web sources with smart tools to track, analyze and visualize research. It's designed to find the information scientists need. Quick, easy and comprehensive, Scopus provides superior support of the literature research process.