Edition Peters is a classical musicpublisher originally founded in Leipzig, Germany in 1800. The Edition Peters Group was formed in August 2010 and consists of Peters UK, Peters Germany, and Peters USA.
History
The company came into being on 1 December 1800 when the ViennesecomposerFranz Anton Hoffmeister (1754-1812) and the local organist Ambrosius Kühnel (1770-1813) opened a concern in Leipzig known as the "Bureau de Musique." Along with publishing, the new firm included an engraving and printing works and a retail shop for selling printed music and instruments. The first music published included chamber music works by Haydn and Mozart, plus a 14-volume collected edition of keyboard works by J. S. Bach, who had lived and worked in Leipzig from 1723-1750, but who was nearly forgotten by that time. When Hofmeister departed for Vienna in 1805, the firm had already issued several works by the then new Viennese composer, Ludwig Van Beethoven (Opp. 19-22; 39-42). Kühnel continued publishing new works, adding those of composers Daniel Gottlob Türk, Václav Tomášek, and Louis Spohr, all of whom went on to have a long relationship with the firm.
Difluoroacetylene, C2F2, is a compound of carbon and fluorine. A linear molecule, its two carbons are joined by a triple bond and have terminal fluorines: F-C≡C-F. The molecule is the perfluorocarbon analog of acetylene, C2H2. Preparation of difluoracetylene is difficult, with danger of explosions and with low yields. Nevertheless, the compound has been made, isolated, and characterized by NMR and IR spectroscopy. The compound is of interest as a precursor to fluoropolymers containing double bonds, analogous to polyacetylene.
Bibliography
Trifu, Roxana Melita (1999). Homopolymers of dihaloacetylenes (Ph.D. thesis, University of Illinois at Chicago). ProQuest.
Comet C/2009 F6 (Yi–SWAN) is a non-periodic comet which appeared in March 2009.
It was first discovered by Korean amateur astronomer Dae-am Yi on March 26, 2009, using a Canon 5D camera and 90-mm lens. It is believed to be the first comet discovered by a Korean in the modern age. Independently, on April 4 Rob Matson reported he had discovered a comet in the SWAN instrument photographs on the SOHO (Solar and Heliospheric Observatory) spacecraft website.
The comet was not bright enough to be seen by the naked eye, but was theoretically visible through amateur telescopes. However, it was harder to see than predicted, as it remained quite small and did not form much of a visible tail. It reached a peak magnitude around +8.5 in April into May, and passed 1.5 degrees south of the Double cluster in Perseus on April 23.
Hexafluoroethane's solid phase has two polymorphs. In the scientific literature, different phase transition temperatures have been stated. The latest works assign it at 103 K (−170°C). Below 103 K it has a slightly disordered structure, and over the transition point, it has a body centered cubic structure.
Table of densities:
Vapor density is 4.823 (air = 1), specific gravity at 21°C is 4.773 (air = 1) and specific volume at 21°C is 0.1748m3/kg.
Uses
Hexafluoroethane is used as a versatile etchant in semiconductor manufacturing. It can be used for selective etching of metal silicides and oxides versus their metal substrates and also for etching of silicon dioxide over silicon. The primary aluminium and the semiconductor manufacturing industries are the major emitters of hexafluoroethane.
When we go I'm falling down to the river I'm gonna climb another mountain I'm going down to the mountain I'm coming up from below I'm gonna climb as high as I can I ain't got no other place to go Down to the river I'm going down to the river I'm going to spread myself around I'm going down to the river Spread myself around How much time How much time How much time
Former political heavyweights John Howard and PeterCostello have slammed the financial mismanagement of the Albanese government as the nation battles through an ongoing cost-of-living crisis.
Peter Chung, Head of Research at quantitative trading firm Presto shares his bullish price targets on key cryptocurrencies. He talks about the factors that could drive Bitcoin to $210,000 and Solana to a new record of $1,000 in 2025 ... .
Peter Boockvar, Bleakley Financial Group chief investment officer, joins 'Money Movers' to discuss markets, impact of tariffs and his 2025 outlook ... .
Peter Boockvar, Bleakley Financial Group chief investment officer, joins 'Money Movers' to discuss markets, impact of tariffs and his 2025 outlook ... .
Olean Times Herald
31 Dec 2024
Olean Times Herald
31 Dec 2024