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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.
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.
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 .
The first attempt was in 1983 when U.S.-based Patton Industries imported the electric oscillating fans, relabeled them "KDK by Patton", and the ceiling fans were then relabeled "RoyalAire" by Sumitomo America, one of Matsushita's banks, shareholders and insurance providers. This was a failure as the products never caught on with consumers.
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 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.
This list of mines in South Africa is subsidiary to the list of mines article and lists working, defunct and future mines in the country and is organised by the primary mineral output. For practical purposes stone, marble and other quarries may be included in this list.
In electromagnetism, a toroidal moment is an independent term in the multipole expansion of the electromagnetic field which is distinct from magnetic and electric multipoles. In the electrostatic multipole expansion, all charge and current distributions can be expanded into a complete set of electric and magnetic multipole coefficients.