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Union Pacific 844, the only steam locomotive never retired by a North American Class I railroad. The 4-8-4 wheel arrangement was a progression from the 4-8-2 Mountain type and, like the 2-8-4 Berkshire and 4-6-4 Hudson types, an example of the "Super Power" concept in steam locomotive design that made use of the larger firebox that could be supported by a four-wheel trailing truck, which ...
For some scholars, including whig historians and the Marxist scholar E. H. Carr, history is a key to understanding the present [17] and, in Carr's case, shaping the future. [18] Certain historians also argue that the purpose of history is to explain change and causes of events, concerns which, in their view, distinguish the historian from the ...
As 2.57 4 = 43.5, it follows from the law that the temperature of the Sun is 2.57 times greater than the temperature of the lamella, so Stefan got a value of 5430 °C or 5700 K. This was the first sensible value for the temperature of the Sun.
KOI-8 (КОИ-8), standardized in 1974 as GOST 19768, is an 8-bit extension of ASCII. [ 1 ] [ 2 ] Originally it only included 32 lowercase and 31 uppercase Russian letters. Later derivatives of KOI-8 constitute the family of encodings variously known as KOI8 , KOI 8 and KOI-8 .
A bronze mural of Hang Tuah that exhibited at the National Museum, Kuala Lumpur, Malaysia.. Hang Tuah (Jawi: هڠ تواه , from /tuha/ or /toh/ (توه) [1]), according to the semi-historical Malay Annals (Sejarah Melayu), was a warrior and Laksamana (equivalent to modern-day Admiral) who lived in Malacca during the reign of Sultan Mansur Shah in the 15th century. [2]
The last expression in the first equation shows that the wavelength of light needed to ionize a hydrogen atom is 4π/α times the Bohr radius of the atom. The second equation is relevant because its value is the coefficient for the energy of the atomic orbitals of a hydrogen atom: E n = − h c R ∞ / n 2 {\displaystyle E_{n}=-hcR_{\infty }/n ...
For any complex number written in polar form (such as r e iθ), the phase factor is the complex exponential (e iθ), where the variable θ is the phase of a wave or other periodic function. The phase factor is a unit complex number, i.e. a complex number of absolute value 1. It is commonly used in quantum mechanics and optics.
This locomotive was delivered as SOB Re 4/4 41, which later became SBB Re 4/4 III 11350 (or Re 430 350-9 with the new classification scheme). Based on the SOB experience, the SBB ordered a batch of 20 Re 4/4 III in 1969 for use on the Gotthard route. Three of those locomotives were sold to the SOB in the 1980s and renumbered Re 4/4 42–44.