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Logo used from 2006 to 2015. Gumtree was founded in March 2000 by Michael Pennington and Simon Crookall as a local London classified ads and community site, designed to connect Australians, New Zealanders and South Africans who were either planning to move, or had just arrived in the city, and needed help getting started with accommodation, employment and meeting new people.
In aeronautics, a ducted fan is a thrust-generating mechanical fan or propeller mounted within a cylindrical duct or shroud. Other terms include ducted propeller or shrouded propeller . [ 1 ] When used in vertical takeoff and landing ( VTOL ) applications it is also known as a shrouded rotor .
Toroidal inductors and transformers are inductors and transformers which use magnetic cores with a toroidal (ring or donut) shape. They are passive electronic components , consisting of a circular ring or donut shaped magnetic core of ferromagnetic material such as laminated iron , iron powder, or ferrite , around which wire is wound.
[13] The term "tokamak" was coined in 1957 [14] by Igor Golovin, a student of academician Igor Kurchatov.It originally sounded like "tokamag" ("токамаг") — an acronym of the words "toroidal chamber magnetic" ("тороидальная камера магнитная"), but Natan Yavlinsky, the author of the first toroidal system, proposed replacing "-mag" with "-mak" for euphony. [15]
A toroidal propeller is a type of propeller that is ring-shaped with each blade forming a closed loop. The propellers are significantly quieter at audible frequency ranges, between 20 Hz and 20 kHz, while generating comparable thrust to traditional propellers. In practice, toroidal propellers reduce noise pollution in both aviation and maritime ...
The Cape Town Civic Centre is a building on the Foreshore in central Cape Town, South Africa that serves as the headquarters of the City of Cape Town, the municipality that governs Cape Town and its suburbs. It was completed in 1978 by Concor, [1] and is made up of two blocks.
South Africa was under an arms embargo at the time; the South African government therefore had to buy arms clandestinely. [43] Klatzow's theory postulates that the government placed a rocket system in the cargo hold, and that vibration caused the ignition of unstable ammonium perchlorate , which is a chemical compound used as a missile propellant.
"The Fan Book" is the one and only book written solely about ceiling fans; and there are no other books in the Library of Congress database which even have a section on ceiling fan history, evolution, or anything like that. Unfortunately, it's kind of a specialized subject area.