A microturbine (MT) is a small gas turbine with similar cycles and components to a heavy gas turbine. The MT power-to-weight ratio is better than a heavy gas turbine because the reduction of turbine diameters causes an increase in shaft rotational speed. Heavy gas turbine generators are too large and too expensive. .
They comprise a , , / and on a single shaft or two. They can have a capturing waste heat to improve the compressor efficiency, an .
started its millimeter size turbine engine project in the middle of the 1990s when Professor of Aeronautics and Astronautics considered the possibility of creating a personal turbine which will be able to meet all the demands of a modern. .
When used in extended range electric vehicles the static efficiency drawback is less important, since the gas turbine can be run at or near maximum power, driving an alternator to produce electricity either for the wheel motors, or for the batteries, as appropriate to speed. .
Forecast international predicts a 51.4% market share for by unit production from 2008 to 2032, followed by with 19.4%, with 13.6%, FlexEnergy with 10.9% and with 4.5%. .
-backed French startup Turbotech is developing a 73 kW (98 shp) turboprop with a recuperator to improve efficiency from 10 to 30%, for a similar to a piston engine, but 30 kg (66 lb) lighter at 55 kg (121 lb) and without cooling drag. Direct .
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[pdf] The early development of solar technologies starting in the 1860s was driven by an expectation that coal would soon become scarce, such as experiments by . installed the world's first rooftop photovoltaic solar array, using 1%-efficient cells, on a New York City roof in 1884. However, development of solar technologies stagnated in the early 20th centu.
[pdf] 科科斯（基林）群岛（英語：Cocos (Keeling) Islands）是位於的 ，位於澳大利亞本土與之間的南緯12°0′00″ 東經96°30′00″。群島面积達14.2；人口有628人（至2005年7月），由27座島組成。仅家岛（Home Island）和（West Island）有人居住。科科斯（基林）群岛的位于西岛。
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