Author: joysine

Asian coal briquettes (Japanese: 練炭, Hepburn: rentan), also known by the names yeontan (Korean: 연탄) or fengwomei (Chinese: 蜂窩煤; Chinese: 蜂窝煤), are coal briquettes used in East Asia for cooking and home heating. They were first invented in Japan, then propagated through the rest of East Asia in the early 20th century, although they are now […]

The Bodroux-Chichibabin aldehyde synthesis is a chemical reaction whereby a Grignard reagent is converted to an aldehyde one carbon longer. Reaction of a Grignard reagent with triethyl orthoformate gives an acetal, which can be hydrolyzed to an aldehyde. For example, the synthesis of n-hexanal:

Woytchugga Lacuna is one of the largest lakes of Titan. It is located at 68°53′ N and 109°00′ W on Titan's surface and at 449 km in length it is the longest Titanean lake and third longest body of a number of "hydro-carbon lakes" found on Saturn's largest moon". The lake is composed of liquid […]

Menabitan (INN; SP-204), or menabitan hydrochloride (USAN), is a synthetic drug which acts as a potent cannabinoid receptor agonist. It is closely related to natural cannabinoids of the tetrahydrocannabinol (THC) group, differing mainly by its longer and branched side chain, and the replacement of the 9-position carbon with a nitrogen. It was studied as an […]

The I-20 is a modernized version of the M-20. It is a 20 ft (6.1 m) sloop rigged scow with a spinnaker. The boat was first built at Melges Boat Works, now Melges Performance Sailboats. The boat has two bilgeboards and two small rudders. After a couple years of experimentation, the class settled on its current rules […]

A coxed four, abbreviated as a 4+, is a racing shell used in the sport of competitive rowing. It is designed for four persons who propel the boat with sweep oars and is steered by a coxswain. The crew consists of four rowers, each having one oar, and a cox. There are two rowers on […]

Amaterska Cave (in Czech Amaterska jeskyne, in English Amateurs Cave, not used) is part of longest cave system in the Moravia, Czech Republic. It is also famous for archaeological discoveries. Except for the entrance, the cave is not accessible to the public, although occasionally it is opened for visitors. The cave is located in the […]

Lowell Lincoln Wood Jr. (born 1941) is an American astrophysicist who has been involved with the Strategic Defense Initiative and with geoengineering studies. He has been affiliated with Lawrence Livermore National Laboratory and the Hoover Institution, and chaired the EMP Commission. Wood is a prolific inventor listed on 1,761 U.S. patents as of August 21, […]

Thiopyrylium is a cation with the chemical formula C5H5S+. It is analogous to the pyrylium cation with the oxygen atom replaced by a sulfur atom. Thiopyrylium salts are less reactive than the analogous pyrylium salts due to the higher polarizability of the sulfur atom. Among the chalcogenic 6-membered unsaturated heterocycles, thiopyrylium is the most aromatic, […]

Polysulfides are a class of chemical compounds derived from anionic chains of sulfur atoms. There are two main classes of polysulfides: inorganic and organic. The inorganic polysulfides have the general formula S2−n. These anions are the conjugate bases of polysulfanes H2Sn. Organic polysulfides generally have the formulae R1SnR2, where R = alkyl or aryl. The […]