Some engines also use cast iron crankshafts for low output versions while the more expensive high output version use forged steel.

Some 19th-century or earlier experimental engines used external flames, exposed by valves, for ignition, but this becomes less attractive with increasing compression.

Some layout engines such as Trident / MSHTML and Presto are associated primarily or exclusively with a particular browser such as Internet Explorer and Opera respectively.

Some engines convert heat from noncombustive processes into mechanical work, for example a nuclear power plant uses the heat from the nuclear reaction to produce steam and drive a steam engine, or a gas turbine in a rocket engine may be driven by decomposing hydrogen peroxide.

Some engines ( air or water cooled ) also have an oil cooler.

" Some unusual engines ", 1975 The Institution of Mechanical Engineers, London.

Some specialised search engines such as Google Scholar offer a way to facilitate searching for academic resources such as journal articles and research papers.

Some aviation engines as well as some early luxury cars have had dual-plugged systems with one set of plugs fired by a magneto, and the other set wired to a coil, dynamo, and battery circuit.

Some real-time software 3D engines based on ray tracing have been developed by hobbyist demo programmers since the late 1990s.

Some engines were equipped with a switch that cut out only some rather than all of the cylinders to ensure that the engine kept running and did not oil up.

Some search engines apply improvements to search queries to increase the likelihood of providing a quality set of items through a process known as query expansion.

Some SSTO vehicles use the same engine for all altitudes, which is a problem for traditional engines with a bell-shaped nozzle.

Some SSTO vehicles simply use very high pressure engines which permit high ratios to be used from ground level.

Some designs for SSTO attempt to use airbreathing jet engines that collect oxidiser and reaction mass from the atmosphere to reduce the take-off weight of the vehicle.

Some commercial aircraft with turboprop engines include the Bombardier Dash 8, ATR 42, ATR 72, BAe Jetstream 31, Embraer EMB 120 Brasilia, Fairchild Swearingen Metroliner, Saab 340 and 2000, Xian MA60, Xian MA600, and Xian MA700, Fokker 27, 50 and 60.

Some of the most popular and successful online sites or search engines of the 2000s included Google, Yahoo !, Wikipedia, Amazon, eBay, MySpace, Facebook, Twitter, and YouTube.

Some search engines, like Yahoo, use automated processes to detect soft 404s.

Some 100-200 engines completed their mission on Soviet and Russian satellites until the late 1990s.

Some are carbureted, usually the smaller engines.

Some of the Shuttle systems integrated in the simulation are the main propulsion system, main engines, solid rocket boosters, ground liquid hydrogen and liquid oxygen, external tank, flight controls, navigation, and avionics.

Some search engines give a higher rank to results where the keyword searched for appears in the URL.

Some search engines like Vivísimo try to group found web pages into automated categories in an attempt to show various genres the search hits might fit.

Some older biplane designs, such as the Grumman Ag Cat and the aforementioned An-2 ( in the form of the An-3 ) are available in upgraded versions with turboprop engines.

Some small propeller-driven aircraft engines still use the updraft carburetor design.

Some lower-compression piston engines can operate on unleaded mogas, and turbine engines and diesel engines — neither of which requires lead — are appearing on some newer light aircraft.

Some hymens are so strongly developed that they cannot be torn without considerable pain to the girl and marked loss of blood.

Some fish had developed primitive lungs to help them breathe air when the stagnant pools of the Devonian swamps were lacking in oxygen.

Some luthiers have increasingly focused their attention on the needs of fingerstylists and have developed unique guitars for this style of playing.

Some NES titles were developed by companies who had licensed their title from a different arcade manufacturer.

Some doubts have been raised about the long-term effectiveness of antipsychotics for schizophrenia, in part because two large international World Health Organization studies found individuals diagnosed with schizophrenia tend to have better long-term outcomes in developing countries ( where there is lower availability and use of antipsychotics and mental health problems are treated with more informal, community-led methods only ) than in developed countries.

Some of the visual problems associated with albinism arise from a poorly developed retinal pigment epithelium ( RPE ) due to the lack of melanin.

Some CEN cycle standards were developed before ISO published their standards, leading to strong European influences in this area.

Some genetic tests are already available, although most of them are used in developed countries.

Some communities have developed their own " Local Exchange Trading Systems " ( LETS ) and local currencies, such as the Ithaca Hours system, to encourage economic growth and an enhanced sense of community.

Some places of employment have developed measures in an attempt to combat and prevent employee crime.

Some argue that the concept of the collapse of a " real " wave function was introduced by Heisenberg and later developed by John Von Neumann in 1932.

Some researchers think the spells are related to centers inside the brain, that regulate breathing, which may not be fully developed.

Some say the call to be eunuchs for the sake of heaven in Matthew 19 was a call to be sexually continent and that this developed into mandatory celibacy for priests as the successors of the apostles.

Some viruses, such as bacteriophages, have developed more complicated structures due to constraints of elasticity and electrostatics.

Some water clock designs were developed independently and some knowledge was transferred through the spread of trade.

Some developed a gangster-like slang for the verb to kill in an attempt to distance themselves from the killings, such as ' shooting partridges ', of ' sealing ' a victim, or giving him a natsokal ( onomatopoeia of the trigger action ).

Some musical genres have a parallel dance form such as baroque music and baroque dance ; others, such as classical music and classical ballet, developed separately.

Some 1st century Christian groups developed docetic interpretations partly as a way to make Christian teachings more acceptable to pagan ways of thinking of divinity.

Some of the most influential contemporary classical double bass players are known as much for their contributions to pedagogy as for their performing skills, such as US bassist Oscar G. Zimmerman ( 1910 – 1987 ), known for his teaching at the Eastman School of Music and, for 44 summers at the Interlochen National Music Camp in Michigan and French bassist François Rabbath ( b. 1931 ) who developed a new bass method that divided the entire fingerboard into six positions.

Some consider aesthetics itself the basis of ethics – and a personal moral core developed through art and storytelling as very influential in one's later ethical choices.

Some consider it a member of the saxhorn family developed by Adolphe Sax ( who also developed the saxophone ).

Some non-software industries are beginning to use techniques similar to those used in free software development for their research and development process ; scientists, for example, are looking towards more open development processes, and hardware such as microchips are beginning to be developed with specifications released under copyleft licenses ( see the OpenCores project, for instance ).

Some economic theories have been developed that support the idea of expanding or shrinking a money supply as economic conditions warrant.

Some fears, such as fear of heights, may be common to all mammals and developed during the mesozoic period.