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Há 1 dia · Open access. Open access logo, originally designed by Public Library of Science. A PhD Comics introduction to open access. Open access ( OA) is a set of principles and a range of practices through which research outputs are distributed online, free of access charges or other barriers. [1]
Há 1 dia · Titanium is superconducting when cooled below its critical temperature of 0.49 K. Commercially pure (99.2% pure) grades of titanium have ultimate tensile strength of about 434 MPa (63,000 psi), equal to that of common, low-grade steel alloys, but are less dense.