|
Het Warme Land
Het or HET may refer to: Science and technology * Hall-effect thruster, a type of ion thruster used for spacecraft propulsion * Heavy Equipment Transporter, a vehicle in the US Army's Heavy Equipment Transport System * Hobby–Eberly Telescope, an instrument at the University of Texas McDonald Observatory * Human enhancement Technologies, devices for enhancing the abilities of human beings * Heterozygote, a diploid organism with differing alleles at a genetic locus; see zygosity * Hexaethyl tetraphosphate, in chemistry * HET acid, alternate term for Chlorendic acid Other uses * Hét, a village in Hungary * Het peoples, or their language * Heterosexuality, sexual attraction to the opposite sex * ''HighEnd Teen'' (2008–2017), a former Indonesian magazine * Historical Enquiries Team (2005–2014), a former unit of the Police Service of Northern Ireland * Holocaust Educational Trust, a British charity * HET, IATA code for Hohhot Baita International Airport, in Inner Mongolia, China ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hall-effect Thruster
In spacecraft propulsion, a Hall-effect thruster (HET) is a type of ion thruster in which the propellant is accelerated by an electric field. Hall-effect thrusters (based on the discovery by Edwin Hall) are sometimes referred to as Hall thrusters or Hall-current thrusters. Hall effect, Hall-effect thrusters use a magnetic field to limit the electrons' axial motion and then use them to ionize propellant, efficiently accelerate the ions to produce thrust, and neutralize the ions in the plume. The Hall-effect thruster is classed as a moderate specific impulse (1,600s) space propulsion technology and has benefited from considerable theoretical and experimental research since the 1960s. Hall thrusters operate on a variety of propellants, the most common being xenon and krypton. Other propellants of interest include argon, bismuth, iodine, magnesium, zinc and adamantane. Hall thrusters are able to accelerate their exhaust to effective exhaust velocity, speeds between 10 and 80 k ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
