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John Ernest Benson
John Ernest Benson (1911-1989) was an Australian engineer and researcher who contributed to studies on piezoelectric crystals, television and sound systems, particularly loudspeakers. Achievements Benson was born in 1911 and educated at Sydney Technical High School and Sydney University, earning his Bachelors of Engineering in 1934. Shortly afterward he joined the Research Laboratories of Amalgamated Wireless (Australasia) Ltd. (AWA). He made contributions to many areas of electronics, starting with piezoelectric crystals. After earning a master's degree in 1945, he moved on to study color television and loudspeakers in the late 1940s and 1950s. On 3 November 1948, the first Australian-produced television set was unveiled at the IRE Radio Convention. The team who created the set were Benson, H.J. Oyston and B.R Johnson, who were present at the unveiling. He designed a novel electrically tapered column loudspeaker system for the Sydney Town Hall to successfully solve some acou ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Piezoelectric Crystal
Piezoelectricity (, ) is the electric charge that accumulates in certain solid materials—such as crystals, certain ceramics, and biological matter such as bone, DNA, and various proteins—in response to applied mechanical stress. The word ''piezoelectricity'' means electricity resulting from pressure and latent heat. It is derived from the Greek word ; ''piezein'', which means to squeeze or press, and ''ēlektron'', which means amber, an ancient source of electric charge. The piezoelectric effect results from the linear electromechanical interaction between the mechanical and electrical states in crystalline materials with no inversion symmetry. The piezoelectric effect is a reversible process: materials exhibiting the piezoelectric effect also exhibit the reverse piezoelectric effect, the internal generation of a mechanical strain resulting from an applied electrical field. For example, lead zirconate titanate crystals will generate measurable piezoelectricity when their ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sydney Technical High School
Sydney Technical High School (STHS) is a government-funded single-sex academically selective secondary day school for boys, located in Bexley, a southern suburb of Sydney, New South Wales, Australia. Founded in 1911 as part of Sydney Technical College, the school was one of the six original New South Wales selective schools and caters for boys from Year 7 to Year 12. The school is colloquially abbreviated to Sydney Tech, STHS or simply Tech. Admission to Year 7 is based on an external selective test held in Year 6 during March. Entrance to Years 8, 9 and 10 is based on the submission of an application form and an interview. Admission to Year 11 is based on the submission of an application form, placement tests in Mathematics and English, and an interview. Academic achievement The school consistently achieves superior results in external assessments, such as the NAPLAN, the ICAS, the Record of School Achievement, and in particular, the Year 12 Higher School Certificate ( ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sydney University
The University of Sydney (USYD), also known as Sydney University, or informally Sydney Uni, is a public research university located in Sydney, Australia. Founded in 1850, it is the oldest university in Australia and is one of the country's six sandstone universities. The university comprises eight academic faculties and university schools, through which it offers bachelor, master and doctoral degrees. The university consistently ranks highly both nationally and internationally. QS World University Rankings ranked the university top 40 in the world. The university is also ranked first in Australia and fourth in the world for QS graduate employability. It is one of the first universities in the world to admit students solely on academic merit, and opened their doors to women on the same basis as men. Five Nobel and two Crafoord laureates have been affiliated with the university as graduates and faculty. The university has educated eight Australian prime ministers, including ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Amalgamated Wireless (Australasia)
AWA Technology Services, name based on former name Amalgamated Wireless (Australasia) Ltd, is an Australian provider for technology related services. Throughout most of the 20th century AWA was Australia's largest and most prominent electronics organisation, undertaking development, manufacture and distribution of radio, telecommunications, television and audio equipment as well as broadcasting services. After the sell-off of most of its assets and operating divisions, AWA is now primarily an information and communications technology (ICT) services company. History Pre-World War II The company commenced operations in 1909 as Australasian Wireless Limited (AWL), a Telefunken wireless agent. The first chairman was Hugh Denison. Ernest Fisk, a foundation director, was general and technical manager. In 1916 he became managing director and in 1932 chairman. The Marconi Company sued the Australian government in 1912, for infringing their patent (and AWL issued writs against fi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sydney Town Hall
The Sydney Town Hall is a late 19th-century heritage-listed town hall building in the city of Sydney, the capital city of New South Wales, Australia, housing the chambers of the Lord Mayor of Sydney, council offices, and venues for meetings and functions. It is located at 483 George Street, in the Sydney central business district opposite the Queen Victoria Building and alongside St Andrew's Cathedral. Sited above the Town Hall station and between the city shopping and entertainment precincts, the steps of the Town Hall are a popular meeting place. It was designed by John H. Wilson, Edward Bell, Albert Bond, Thomas Sapsford, John Hennessy and George McRae and built from 1869 to 1889 by Kelly and McLeod, Smith and Bennett, McLeod and Noble, J. Stewart and Co. It is also known as Town Hall, Centennial Hall, Main Hall, Peace Hall, Great Hall and Old Burial Ground. The Town Hall is listed on the (now defunct) Register of the National Estate and the New South Wales State Heri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sound Reinforcement System
A sound reinforcement system is the combination of microphones, signal processors, amplifiers, and loudspeakers in enclosures all controlled by a mixing console that makes live or pre-recorded sounds louder and may also distribute those sounds to a larger or more distant audience. In many situations, a sound reinforcement system is also used to enhance or alter the sound of the sources on the stage, typically by using electronic effects, such as reverb, as opposed to simply amplifying the sources unaltered. A sound reinforcement system for a rock concert in a stadium may be very complex, including hundreds of microphones, complex live sound mixing and signal processing systems, tens of thousands of watts of amplifier power, and multiple loudspeaker arrays, all overseen by a team of audio engineers and technicians. On the other hand, a sound reinforcement system can be as simple as a small public address (PA) system, consisting of, for example, a single microphone connecte ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sydney Opera House
The Sydney Opera House is a multi-venue performing arts centre in Sydney. Located on the foreshore of Sydney Harbour, it is widely regarded as one of the world's most famous and distinctive buildings and a masterpiece of 20th-century architecture. Designed by Danish architect Jørn Utzon, but completed by an Australian architectural team headed by Peter Hall, the building was formally opened by Queen Elizabeth II on 20 October 1973 after a gestation beginning with Utzon's 1957 selection as winner of an international design competition. The Government of New South Wales, led by the premier, Joseph Cahill, authorised work to begin in 1958 with Utzon directing construction. The government's decision to build Utzon's design is often overshadowed by circumstances that followed, including cost and scheduling overruns as well as the architect's ultimate resignation. The building and its surrounds occupy the whole of Bennelong Point on Sydney Harbour, between Sydney Cove and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Richard H
Richard is a male given name. It originates, via Old French, from Old Frankish and is a compound of the words descending from Proto-Germanic ''*rīk-'' 'ruler, leader, king' and ''*hardu-'' 'strong, brave, hardy', and it therefore means 'strong in rule'. Nicknames include " Richie", "Dick", " Dickon", " Dickie", "Rich", " Rick", " Rico", " Ricky", and more. Richard is a common English, German and French male name. It's also used in many more languages, particularly Germanic, such as Norwegian, Danish, Swedish, Icelandic, and Dutch, as well as other languages including Irish, Scottish, Welsh and Finnish. Richard is cognate with variants of the name in other European languages, such as the Swedish "Rickard", the Catalan "Ricard" and the Italian "Riccardo", among others (see comprehensive variant list below). People named Richard Multiple people with the same name * Richard Andersen (other) * Richard Anderson (other) * Richard Cartwright (disambiguati ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thiele/Small
Thiele/Small parameters (commonly abbreviated T/S parameters, or TSP) are a set of electromechanical parameters that define the specified low frequency performance of a loudspeaker driver. These parameters are published in specification sheets by driver manufacturers so that designers have a guide in selecting off-the-shelf drivers for loudspeaker designs. Using these parameters, a loudspeaker designer may simulate the position, velocity and acceleration of the diaphragm, the input impedance and the sound output of a system comprising a loudspeaker and enclosure. Many of the parameters are strictly defined only at the resonant frequency, but the approach is generally applicable in the frequency range where the diaphragm motion is largely pistonic, i.e. when the entire cone moves in and out as a unit without cone breakup. Rather than purchase off-the-shelf components, loudspeaker design engineers often define desired performance and work backwards to a set of parameters and manufactu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Neville Thiele
Albert Neville Thiele, OAM (4 December 1920 – 1 October 2012), was an Australian audio engineer. Thiele was born in Brisbane, Australia. He was particularly noted for his work on electronic filters and on developing the Thiele/Small parameters for characterising loudspeakers as an aid to loudspeaker cabinet design. Early life and education Thiele was educated at Milton State School, Brisbane Grammar School and the Universities of Queensland and Sydney. After performing on Brisbane radio stations as a boy soprano in the early 1930s, and later as an actor, he became interested in the reproduction and transmission of sound. After five years of war service in infantry and the Australian Electrical and Mechanical Engineers (AEME, subsequently Royal Australian Electrical and Mechanical Engineers) in New Guinea and Bougainville, he graduated with a Bachelor of Engineering (Mechanical and Electrical) in 1952. Career Joining EMI (Australia) Ltd., Thiele was employed as a des ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1911 Births
A notable ongoing event was the Comparison of the Amundsen and Scott Expeditions, race for the South Pole. Events January * January 1 – A decade after federation, the Northern Territory and the Australian Capital Territory are added to the Commonwealth of Australia. * January 3 ** 1911 Kebin earthquake: An earthquake of 7.7 Moment magnitude scale, moment magnitude strikes near Almaty in Russian Turkestan, killing 450 or more people. ** Siege of Sidney Street in London: Two Latvian people, Latvian anarchists die, after a seven-hour siege against a combined police and military force. Home Secretary Winston Churchill arrives to oversee events. * January 5 – Egypt's Zamalek SC is founded as a general sports and Association football club by Belgian lawyer George Merzbach as Qasr El Nile Club. * January 14 – Roald Amundsen's South Pole expedition makes landfall, on the eastern edge of the Ross Ice Shelf. * January 18 – Eugene B. El ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1989 Deaths
File:1989 Events Collage.png, From left, clockwise: The Cypress structure collapses as a result of the 1989 Loma Prieta earthquake, killing motorists below; The proposal document for the World Wide Web is submitted; The Exxon Valdez oil tanker runs aground in Prince William Sound, Alaska, causing a large oil spill; The Fall of the Berlin Wall begins the downfall of Communism in Eastern Europe, and heralds German reunification; The United States invades Panama to depose Manuel Noriega; The Singing Revolution led to the independence of the Baltic states of Estonia, Latvia, and Lithuania from the Soviet Union; The stands of Hillsborough Stadium in Sheffield, Yorkshire, where the Hillsborough disaster occurred; Students demonstrate in Tiananmen Square, Beijing; many are killed by forces of the Chinese Communist Party., 300x300px, thumb rect 0 0 200 200 1989 Loma Prieta earthquake rect 200 0 400 200 World Wide Web rect 400 0 600 200 Exxon Valdez oil spill rect 0 200 300 400 1989 Tiananm ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
