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Diagram of a hydrogen maser A hydrogen maser , also known as hydrogen frequency standard , is a specific type of maser that uses the intrinsic properties of the hydrogen atom to serve as a precision frequency reference.
A hydrogen maser. The hydrogen maser is used as an atomic frequency standard. Together with other kinds of atomic clocks, these help make up the International Atomic Time standard ("Temps Atomique International" or "TAI" in French). This is the international time scale coordinated by the International Bureau of Weights and Measures.
Emissions from burning hydrogen can be negligible but emissions from producing hydrogen are currently higher than direct combustion of the source. [37] Hydrogen has a wide flammability range (3–70% H 2 in air) in comparison with other fuels. [35] As a result, it can be combusted in an internal combustion engine over a wide range of fuel-air ...
Even when liquefied, hydrogen has a higher specific energy but the volumetric energetic storage is still roughly five times lower than gasoline. However, the energy density of hydrogen is considerably higher than that of electric batteries, making it a serious contender as an energy carrier to replace fossil fuels.
1991 – Mazda HR-X hydrogen Rotary; 1993 – Mazda HR-X2 hydrogen Rotary; 1993 – Mazda MX-5 Miata hydrogen Rotary; 1995 – Mazda Capella, first public street test of the hydrogen Rotary engine; 2003 – Mazda RX-8 Hydrogen RE hydrogen-gasoline hybrid Rotary; 2005 – Mazda Premacy Hydrogen RE Hybrid; 2007 – Mazda Hydrogen RE Plug in Hybrid
A hydrogen maser produces a very accurate signal (1.42 billion cycles per second), which is highly stable—to one part in a quadrillion (10 15). This is equivalent to a clock that drifts by less than two seconds every 100 million years. [5] A microwave signal derived from the maser frequency was transmitted to the ground throughout the mission.
The Honda FCX (commonly referred to as Fuel Cell eXperimental) is a family of hydrogen fuel cell automobiles manufactured by Honda.. The Honda FCX and Toyota FCHV, which began leasing on December 2, 2002, became the world's first government-certified commercial hydrogen fuel cell vehicles.
The Mazda HR-X was the first hydrogen powered concept car produced by Mazda.The car was unveiled at the Tokyo Motor Show in 1991. The car seated four passengers in a plastic shell and was powered by a two rotor Wankel engine which propelled it to 130 km/h (81 mph).