Contains full-text articles in the fields of physics, mathematics, non-linear science, computer science, and quantitative biology. Many of the papers are scheduled to be published in professional journals. Because papers are submitted and posted without peer review, the arXiv represents extremely up-to-date research. Materials are added on a daily basis.
Science Direct contains abstracts and full-text articles from scientific, technological, and medical scholarly journals and reference books. Subjects covered include biology, chemistry, computer science, economics, environmental science, mathematics, medicine, neuroscience, nursing, physics, education, and psychology. Note that Science Direct only searches Elsevier journals.