Since the mid 1950s, when urethane foam first made its appearance in the American market, growth has been little short of fantastic.

Since the 1950s, this type of fiction has to a large extent merged with science fictional tropes involving cross-time travel between alternate histories or psychic awareness of the existence of " our " universe by the people in another ; or ordinary voyaging uptime ( into the past ) or downtime ( into the future ) that results in history splitting into two or more time-lines.

Since the 1950s, Prince Philip has also added herbaceous borders and a water garden.

Since the growth of global fishing enterprises after the 1950s, intensive fishing has spread from a few concentrated areas to encompass nearly all fisheries.

" Since the 1950s conservatism in the United States has been chiefly associated with the Republican Party.

* Since the 1950s, the United States Atomic Energy Commission has named its highest honor, the Fermi Award, after him.

Since the 1950s, hydrology has been approached with a more theoretical basis than in the past, facilitated by advances in the physical understanding of hydrological processes and by the advent of computers and especially geographic information systems ( GIS ).

Since the 1950s, when Lacan and Foucault argued that each epoch has its own knowledge system, which individuals are inexorably entangled with, many post-structuralists have used historicism to describe the view that all questions must be settled within the cultural and social context in which they are raised.

Since the 1950s, many blues harmonica players have amplified their instrument with microphones and tube amplifiers.

Since the 1950s and 1960s in particular, the Irish have become assimilated into the British population.

Since the 1950s, following the lead of D. W. Jefferson, there are those who argue that, whatever its legacy of influence may be, Tristram Shandy in its original context actually represents a resurgence of a much older, Renaissance tradition of " Learned Wit " – owing a debt to such influences as the Scriblerian approach.

Since the 1950s, manga has steadily become a major part of the Japanese publishing industry, representing a ¥ 406 billion market in Japan in 2007 ( approximately $ 3. 6 billion ) and ¥ 420 billion ($ 5. 5 billion ) in 2009.

Since the 1950s however, manufacturing shortcuts have resulted in a quality decline of machetes.

Since trade was restricted in the 1950s they have found work as high altitude porters, guides, cooks and other accessories to tourism and alpinism.

Since the early 1970s, oral history in Britain has grown from being a method in folklore studies ( see for example the work of the School of Scottish Studies in the 1950s ) to becoming a key component in community histories.

Since the 1950s, the club's helmets have featured eagle wings, originally silver on a kelly green helmet.

Since the late 1950s, almost all phono input stages have used the RIAA equalization standard.

Since the 1950s, television has been the main medium for molding public opinion.

Since the 1950s, television has been the main medium for molding public opinion.

Since the 1950s, Montevideo's prosperous middle classes have tended to abandon the formerly fashionable downtown areas for the more modern high-rise apartment buildings of Pocitos, a beachfront neighborhood east of the center.

Since the late 1950s, aerospace engineers have used the term " unobtainium " when referring to unusual or costly materials, or when theoretically considering a material perfect for their needs in all respects, except that it does not exist.

Since the end of the 20th century, the economic strength during the 1920s has drawn close comparison with the 1950s and 1990s, especially in the United States of America.

Since the 1950s, Real Madrid and Barcelona have dominated the championship.

: Since the 1950s, both the atmospheric CO < sub > 2 </ sub > level and obesity levels have increased sharply.

Since then, the Cockney accent has been more accepted as an alternative form of the English Language rather than an ' inferior ' one ; in the 1950s the only accent to be heard on the BBC ( except in entertainment programmes such as Sooty ) was RP, whereas nowadays many different accents, including Cockney or ones heavily influenced by it, can be heard on the BBC.

Since the evolution of the Aramaic alphabet out of the Phoenician one was a gradual process, the division of the world's alphabets into those derived from the Phoenician one directly and those derived from Phoenician via Aramaic is somewhat artificial.

Since then, other variant designs involving building an artificial structure or series of structures to encompass a star have been proposed in exploratory engineering or described in science fiction under the name " Dyson sphere.

Since he was originally intended as a temporary medical backup system, not as an artificial life form, considerable strains were placed on the Doctor's program during the early parts of the journey.

Since artificial ice became common in the Netherlands, Dutch speed skaters have been among the world top in long track ice skating and marathon skating.

Since its approval by the United States government in 1998 and introduction there in 1999, sucralose has overtaken Equal in the $ 1. 5 billion artificial sweetener market, holding a 62 % market share.

Since the mid-1970s, researchers in the field of artificial intelligence ( AI ) have recognized that capturing knowledge is the key to building large and powerful AI systems.

Since the crossing is actually composed of a bridge, one artificial island and a tunnel, it is sometimes called the " Öresund Link " or the " Öresund Connection " ( Danish: Øresundsforbindelsen, Swedish: Öresundsförbindelsen ).

Since footballs tend to bounce in unpredictable ways, particularly on artificial turf, attempting to recover and advance a fumbled ball is risky even for those with good manual coordination.

Since that time, most bass anglers have used bait casting or spinning tackle, using either artificial lures or live bait ( See Fishing rod, Fishing reel ).

Since the early 1990s when the first practically usable types emerged, artificial neural networks ( ANNs ) have rapidly grown in popularity.

Since the hub is at the rotational axis of the station, it experiences the least artificial gravity and is the easiest location for spacecraft to dock.

Since margarine intrinsically appears white or almost white, by forbidding the addition of artificial colouring agents, legislators found that they could protect the dairy industries by discouraging the consumption of margarine based on visual appeal.

Since 1977, Artificial Organs has been publishing original articles featuring the studies of design, performance, and evaluation of the biomaterials and devices for the international medical, scientific, and engineering communities involved in the research and clinical application of artificial organ development.

Since 1998, musical works patented by René-Louis Baron made a big step in the two domains of algorithmic music and artificial intelligence.

Since the 1990s, a number of research efforts have explored how the idea of knowledge representation ( KR ) from artificial intelligence ( AI ) could be made useful on the World Wide Web.

Since their heightened emotions are a result of the heart shard within them, they are freed of this artificial intensity when Princess Tutu removes the shards and returns them to Mytho.

Since Kalidasa was an original poet, it is extremely unlikely that he borrowed from Asvaghosha being a philosopher and mostly considered an artificial poet, and with a much more chance would have done so.

Since language is inherently artificial, and " not naturall to man " ( 120 ), the added artifice of figures is particularly suitable.

Since photosynthesis and other natural processes create extremely complex molecules to the specifications contained in RNA and stored long-term in DNA form, advocates of molecular engineering claim that an artificial process can likewise exploit a chain of long-term storage, short-term storage, enzyme-like copying mechanisms similar to those in the cell, and ultimately produce complex molecules which need not be proteins.

Since these characteristics will typically make control by the pilot difficult or impossible, an artificial stability will typically be imposed using computers, servos, and sensors as parts of a fly by wire control system.

Since then he has co-authored numerous additional papers on artificial evolution.

Since the beginning, the inhabitants of the region understood that the arid climate required an advanced artificial irrigation system with dams and channels.

Since these games emphasize multiplayer gameplay, many have only basic single-player aspects and the artificial intelligence on the server is primarily designed to support group play.

Since pi is a transcendental number, such frequency couldn't possibly be produced in a natural way as a harmonic, and would clearly signify its artificial origin.

Since 1986 he has authored a series of highly influential papers which have inaugurated a fundamental shift in artificial intelligence research.