2 Matching Annotations
- Apr 2020
Preprints? What? Also sometimes referred to as e-prints, they are digitally shared, non-peer-reviewed scholarly articles that typically precede publication in a peer-reviewed journal . They have been a part of science since at least the 1960s .
Preprint adalah makalah yang belum menjalani peninjauan sejawat yang versi digitalnya dibagikan secara daring. Preprint biasanya dibagikan sebelum dikirimkan ke jurnal.
Preprint bukan barang baru
Preprint telah dikenal sejak tahun 1960an (bidang biologi/ilmu hayati). Preprint merupakan salah satu produk turunan dari
wwwyang diciptakan pada tahun 1990 oleh Tim Berners-Lee.
- Jun 2019
Despite their name, rare-earth elements are – with the exception of the radioactive promethium – relatively plentiful in Earth's crust, with cerium being the 25th most abundant element at 68 parts per million, more abundant than copper. However, because of their geochemical properties, rare-earth elements are typically dispersed and not often found concentrated in rare-earth minerals; as a result economically exploitable ore deposits are less common. The first rare-earth mineral discovered (1787) was gadolinite, a mineral composed of cerium, yttrium, iron, silicon, and other elements. This mineral was extracted from a mine in the village of Ytterby in Sweden; four of the rare-earth elements bear names derived from this single location.