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Like other crown ethers, 12-crown-4 complexes with alkali metal cations. The cavity diameter of 1.2-1.5 Å gives it a high selectivity towards the lithium cation (ionic diameter 1.36 Å) [2] Its point group is S 4. The dipole moment of 12-crown-4 varies with solvent and temperature. At 25 °C, the dipole moment of 12-crown-4 was determined as 2 ...
The Union Pacific 9000 class was the only class of steam locomotives with a 4-12-2 wheel arrangement ever to be built. Under the Whyte notation for the classification of steam locomotives, the locomotives had four leading wheels, twelve coupled driving wheels, and two trailing wheels. As the Union Pacific was the only operator of this wheel ...
Mike Davids. Glyn Havard (live only) Tony Duhig (live only) Allan Price (live only) Iain Hines (live only) Unit 4 + 2 were a British pop band formed in Hertfordshire, England, who had a number one hit on the UK Singles Chart in 1965 with the song "Concrete and Clay". [ 1] The track topped the UK chart for one week.
The car is powered by a four-cylinder 1,496 cc (91.3 cu in) "12/4 Engine" with one or two Zenith carburettors. Designed by Hugh Rose, it was based on the Riley Nine engine but with some significant changes including the cylinder block and crankcase being cast as one unit. It was advanced for its day with twin camshafts mounted high in the ...
In 2022, 1 in 10 babies born in the U.S. were premature, an 8% increase since 2014 after a steady decline in the early 2010s. Babies born at less than 37 weeks of gestation are considered preterm ...
The Republic XF-12 Rainbow was an American four-engine, all-metal prototype reconnaissance aircraft designed by the Republic Aviation Company in the late 1940s. Like most large aircraft of the era, it used radial engines, specifically the Pratt & Whitney R-4360 Wasp Major. The XF-12 was referred to as "flying on all fours" meaning: four engines ...
Li ( Chinese: 理; pinyin: lǐ) is a concept found in neo-Confucian Chinese philosophy. It refers to the underlying reason and order of nature as reflected in its organic forms. It may be translated as "rational principle ", "law", or " organisational rights". It was central to Zhu Xi 's integration of Buddhism into Confucianism.
Li Hongzhang, Marquess Suyi ( Chinese: 李鴻章; also Li Hung-chang; 15 February 1823 – 7 November 1901) was a Chinese statesman, general and diplomat of the late Qing dynasty. He quelled several major rebellions and served in important positions in the Qing imperial court, including the Viceroy of Zhili, Huguang and Liangguang .