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JSTOR (/ ˈ dʒ eɪ s t ɔːr / JAY-stor; short for Journal Storage) [2] is a digital library of academic journals, books, and primary sources founded in 1994. Originally containing digitized back issues of academic journals, it now encompasses books and other primary sources as well as current issues of journals in the humanities and social sciences. [3]
The first was established in 1816 by William Thomas Brande, as the Quarterly Journal of Science, Literature and the Arts. He edited it with John Millington and then Michael Faraday . To a large extent a vehicle for authors associated with the Royal Institution , it was taken over by the Institution in 1830, and then appeared as the Journal of ...
Encyclopædia Britannica Eleventh Edition First page of the Encyclopædia Britannica, Eleventh Edition Language British English Release number 11 Subject General Publisher Horace Everett Hooper Publication date 1910–1911 Publication place United States Media type Print and digital Preceded by Encyclopædia Britannica Tenth Edition Followed by Encyclopædia Britannica Twelfth Edition ...
This is an accepted version of this page This is the latest accepted revision, reviewed on 13 January 2025. Educational assessment For other uses, see Exam (disambiguation) and Examination (disambiguation). Cambodian students taking an exam in order to apply for the Don Bosco Technical School of Sihanoukville in 2008 American students in a computer fundamentals class taking an online test in ...
Quaternary ammonium cation. The R groups may be the same or different alkyl or aryl groups. Also, the R groups may be connected. In organic chemistry, quaternary ammonium cations, also known as quats, are positively-charged polyatomic ions of the structure [NR 4] +, where R is an alkyl group, an aryl group [1] or organyl group.
The history of acid-base titration dates back to the late 19th century when advancements in analytical chemistry fostered the development of systematic techniques for quantitative analysis. [5] The origins of titration methods can be linked to the work of chemists such as Karl Friedrich Mohr in the mid-1800s. [ 5 ]
One of Crookes's students was the Reverend John Barlow, Secretary of the Royal Institution, who chose to take a course in analytical chemistry. Through Barlow, Crookes met scientists such as George Gabriel Stokes and Michael Faraday. [3]: 11 Such friends reinforced Crookes's interest in optical physics [3]: 13 which was respected by Hofmann.
Wikipedia is the largest and most-read reference work in history, [3] [4] and is consistently ranked among the ten most visited websites; as of December 2024, it was ranked fifth by Semrush, [5] and seventh by Similarweb. [6]