Since the 1960s, composite airframes and quieter, more efficient engines have become available, and Concorde provided supersonic passenger service for more than two decades, but the most important lasting innovations have taken place in instrumentation and control.

Since the 1960s, the islands have diversified away from their traditionally agriculture-based economy towards tourism and financial services, becoming one of the wealthiest areas in the Caribbean.

Since the 1960s, the bass guitar has largely replaced the double bass in popular music as the bass instrument in the rhythm section.

Since the 1960s, blackjack has been a high profile target of advantage players, particularly card counters, who track the profile of cards that have been dealt and adapt their wager and playing strategies accordingly.

Since the 1960s / 1970s, Blissymbols have become popular as a method to teach disabled or handicapped people to communicate.

Since the 1960s, applied ethics has revived the ideas of casuistry in applying ethical reasoning to particular cases in law, bioethics and business ethics, so the reputation of casuistry is somewhat rehabilitated.

Since the international adoption of the MKS standard in the 1940s and the SI standard in the 1960s, the technical use of CGS units has gradually declined worldwide, in the United States more slowly than elsewhere.

Since the early 1960s, it has been known that volcanism has occurred on other planets and moons in the Solar System.

Since then McLean has stated that the lyrics are also somewhat autobiographical and present an abstract story of his life from the mid-1950s until the time he wrote the song in the late 1960s.

Since at least the 1960s, macroeconomics has been characterized by further integration as to micro-based modeling of sectors, including rationality of players, efficient use of market information, and imperfect competition.

Since at least the 1960s, when Marc Bloch's Feudal Society ( 1939 ) was first translated into English in 1961, many medieval historians have included a broader social aspect that includes not only the nobility but all three estates of the realm, adding the peasantry bonds of manorialism and the estates of the Church ; this is sometimes referred to as " feudal society " since it encompasses all members of society into the feudal system.

Since the 1960s, West and later reunified Germany has been attracting migrants primarily from Southern and Eastern Europe as well as Turkey, many of whom ( or their children ) over time acquired German citizenship.

Since the 1960s rather complex mathematical models have been developed, facilitated by the availability of high speed computers.

Since the 1960s, academic history has seen the emergence of new approaches and topics such as social history, demographic history, ethnic history, women's history, environmental history and cultural history.

Since the 1960s and 1970s a large body of scholarship has provided evidence and analysis of the extent to which heterosexuality and homosexuality are socially organized and historically changing.

Since the 1960s various Scottish shops and manufacturers have created vegetarian haggis, substituting various pulses, nuts and vegetables for the meat in the dish.

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

Since the early 1960s, it has published 12 volumes, the first in 1971 and most recently in 2008 ; three more volumes are planned.

Since the 1960s, he has worked with public interest, consumer, family farm, environmental and community organizations at the local, state and national level.

Since the 1960s, orca has steadily grown in popularity ; both names are now used.

Since the 1960s, a theory based on Linear B phonetic values suggests that Linear A language could be an Anatolian language, close to Luwian.

Since the beginning of the 1960s Ladoga has become considerably eutrophicated.

Since the 1960s, the mainland population has declined by 60-70 %; though there has been a small increase on Motunau Island.

Since the 1960s, the number of people claiming Native American ancestry has grown significantly and by the 2000 census, the number had more than doubled.

Since the 1960s the Chief rabbinate of Israel has moved somewhat closer to the positions of Haredi Judaism.

Since 1994, a new version of the band has toured, with Parsons performing live acoustic guitar, keyboards and vocals, with various lineups.

Since the 1990s, Canadian born musician Nadaka who has spent most of his life in India, has been creating music that is an acoustic fusion of Indian classical music with western styles.

Since the mid-1980s, Peart has used MIDI trigger pads to trigger sounds sampled from various pieces of acoustic percussion that would otherwise consume far too much stage area, such as a marimba, harp, temple blocks, triangles, glockenspiel, orchestra bells, tubular bells, and vibraslap as well as other, more esoteric percussion.

Since most attacks were at night, searchlights were soon used, and acoustic methods of detection and locating were developed.

Since temperature ( and thus the speed of sound ) decreases with increasing altitude up to 11 km, sound is refracted upward, away from listeners on the ground, creating an acoustic shadow at some distance from the source.

Since temperature and sound velocity normally decrease with increasing altitude, sound is refracted upward, away from listeners on the ground, creating an acoustic shadow at some distance from the source.

Since the 1990s, however, many opera houses have begun using a subtle form of sound reinforcement called acoustic enhancement ( see below ).

Since, Bell and Colbert made an appearance at one of Gardener's early shows ; Bell later shared two nights of acoustic sets with Gardener in November 2003 when Gardener made a tour stop in Bell's current home of Stockholm.

Since the 1970s the voice-powered acoustic megaphone described above has been replaced by the electric megaphone, which uses electric power to amplify the voice.

Since then, cheerleaders have relied heavily on acoustic megaphones during performances at sporting events.

Since temperature and sound velocity normally decrease with increasing altitude, sound is refracted upward, away from listeners on the ground, creating an acoustic shadow at some distance from the source.

Since an 800 watt amplifier built with standard Class AB technology would be very heavy, some acoustic amplifier manufacturers use lightweight Class D amplifiers, which are also called " switching amplifiers.

Since the early 2000s, it has become increasingly common for acoustic amplifiers to be provided with a range of digital effects, such as reverb and compression.

Since an 800 watt amplifier built with standard Class AB technology would be very heavy, some acoustic amplifier manufacturers use lightweight Class D amplifiers, which are also called " switching amplifiers.

Since the early 2000s, it has become increasingly common for acoustic amplifiers to be provided with a range of digital effects, such as reverb and compression.

Since the mid 1990s, the Australian company Maton has used bunya for the soundboards of its BG808CL Performer acoustic guitars.

Since 1991, Howe has released a solo recording almost every year, ranging from acoustic to progressive to a Bob Dylan tribute.

Since the 1950s, speech scientists have tried to show the existence of equal syllable durations in the acoustic speech signal without success.

Since 2010, an acoustic instrumental version of " I'm Shipping Up to Boston " has been used as the theme song to the TNT crime drama Rizzoli & Isles.

Since the beginning he became in charge of the keyboards, acoustic guitar, piano, programming, vocals, melodeon, and melodica.

Since their second album the band has performed and recorded with multi-instrumentalist Jeff Bird, whose current role includes acoustic and electric mandolins, harmonica, percussion, and samples.

Since then, the group has kept a video blog to communicate the upcoming album's progress to their fans, answering their questions and previewing acoustic songs.

Since the growth rate of an acoustic neuroma rarely accelerates, annual observation is sufficient.