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Iridium compounds are used as catalysts in the Cativa process for carbonylation of methanol to produce acetic acid. [92] [93] Iridium complexes are often active for asymmetric hydrogenation both by traditional hydrogenation. [94] and transfer hydrogenation. [95] This property is the basis of the industrial route to the chiral herbicide (S ...
September 18, 1968 – F.R. Germany – An iridium-192 source was mishandled by workers, with one person placing the source in their jacket pocket. Six workers were exposed, with one receiving a 100 rad (1.0 Gy) whole body dose and 4,000–6,000 rad (40–60 Gy) localized dose to their pelvic and thigh regions.
Luis (left) and his son Walter Alvarez (right) at the K-Pg Boundary in Gubbio, Italy, 1981. In 1980, a team of researchers led by Nobel prize-winning physicist Luis Alvarez, his son, geologist Walter Alvarez, and chemists Frank Asaro and Helen Vaughn Michel discovered that sedimentary layers found all over the world at the Cretaceous–Paleogene boundary contain a concentration of iridium ...
(Bíró's patent, and other early patents on ball-point pens often used the term "ball-point fountain pen," because at the time the ball-point pen was considered a type of fountain pen; that is, a pen that held ink in an enclosed reservoir.) [35] This period saw the launch of innovative models such as the Parker 51, the Aurora 88, the Sheaffer ...
Most definitions of the term 'refractory metals' list the extraordinarily high melting point as a key requirement for inclusion. By one definition, a melting point above 4,000 °F (2,200 °C) is necessary to qualify, which includes iridium, osmium, niobium, molybdenum, tantalum, tungsten, rhenium, rhodium, ruthenium and hafnium. [2]
It is possible that mass was celebrated at the Externsteine at that point. A potential earlier mention occurs in a document dated 1093, but this is only extant in two copies from 1374 and 1380. It records the purchase of a farm at Holzhausen including an Agisterstein by the abbot of the Abdinghofkloster [ de ] (abbey) at Paderborn from a female ...
Observation Post Alpha, OP Alpha, or Point Alpha was a Cold War observation post between Rasdorf, Hesse, West Germany and Geisa, Thuringia, East Germany.The post overlooked part of the "Fulda Gap", which would have been a prime invasion route for Warsaw Pact forces had the Cold War erupted into actual warfare.
The Three-Country Point with the border post dating back to 1926 Gemmenicher Tunnel. The Vaalserberg is also the location of the tripoint between Germany, Belgium and the Netherlands and so its summit is called the Drielandenpunt ("three country point") in Dutch, Dreiländereck ("three country corner") in German and Trois Frontières ("three borders") or Trois Bornes ("three border stones") in ...
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