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A simple 3 blade toroidal propeller. 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 ...
Toroidal inductors and transformers, a type of electrical device using magnetic cores with a ring or donut shape; Toroidal propeller, a loop-shaped propeller used in aviation and maritime transport; Toroidal reflector, a reflector whose surface is a section of a torus which has a different focal distance depending on the angle of the mirror
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For humans, the efficiency of conversion is estimated as requiring 60 mg of tryptophan to make 1 mg of niacin. Riboflavin , vitamin B 6 and iron are required for the process. [ 20 ] Pellagra is a consequence of a corn-dominant diet because the niacin in corn is poorly bioavailable and corn proteins are low in tryptophan compared to wheat and ...
The Voith Schneider propeller was originally a design for a hydro-electric turbine. [2] Its Austrian inventor, Ernst Schneider, had a chance meeting on a train with a manager at Voith's subsidiary St. Pölten works; this led to the turbine being investigated by Voith's engineers, who discovered that although it was no more efficient than other water turbines, Schneider's design worked well as ...
Nicotinamide riboside (NR) is now known to be an NAD+ precursor, involved in the biosynthetic pathways that convert B3 vitamins into NAD+. NAD+ is primarily synthesized in mammals de novo from tryptophan, through the Priess-Handler pathway from nicotinic acid (NA) or via a salvage pathway from nicotinamide (NAM).
Dianazene was the name given by L. Ron Hubbard to a vitamin compound containing iron, vitamin C, and various B vitamins, including especially large doses of niacin.. Hubbard promoted it as a form of protection against radiation poisoning during the 1950s, saying that "Dianazene runs out radiation — or what appears to be radiation.
In air at least, much of the noise in a propeller or rotor is generated due to blade vortex interaction. Closed-wing/annular designs are known to reduce the shedding of tip-vortices, and designs that reduce tip-vortices are known to reduce the noise (e.g. fenestrons or ducted fans).