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New Old Stock (NOS) 6DJ8s and ECC88s produced in the past by major American or West European vacuum tube manufacturers (such as Philips or Amperex) remain extremely popular with and highly sought by audiophiles.
Since January 2011 Alcatel Vacuum Technology France is part of Pfeiffer Vacuum GmbH.
After the development by Lee de Forest of the triode vacuum tube in 1906, it was realized that the upper frequency at which the device could be used was limited by the spacing between internal components.
Thompson was a Fellow of the Institute of Radio Engineers, and received the 1936 IEEE Morris N. Liebmann Memorial Award "for his contribution to the vacuum-tube art in the field of very-high frequencies."
For further elaboration, see the articles on the quantum mechanical vacuum and the vacuum of quantum chromodynamics.
Central vacuum installations can earn points for Leadership in Energy and Environmental Design (LEED) home certification, Health House certification by the American Lung Association, or the National Green Building Standard of the National Association of Homebuilders (NAHB).
In an X-ray tube, electrons are accelerated in a vacuum by an electric field and shot into a piece of metal called the "target".
The video game Dyson (now called Eufloria to avoid confusion with Dyson vacuum cleaners) got its name and idea from Freeman Dyson's Dyson Tree hypothesis.
Medard W. Welch Award of the American Vacuum Society (1992) - "for his contributions to the fundamental understanding of thin film nucleation and growth and for his invention, development and use of multiple surface characterization techniques to study those thin films."
With sufficiently clever assumptions of this sort, it is often possible to reduce the Einstein field equation to a much simpler system of equations, even a single partial differential equation (as happens in the case of stationary axisymmetric vacuum solutions, which are characterized by the Ernst equation) or a system of ordinary differential equations (as happens in the case of the Schwarzschild vacuum).
Marc Antoine Auguste Gaudin (1804–1880), a French chemistry researcher and inventor of an air vacuum pump
The managing director was Hubert Cecil Booth who the company claimed had in fact invented the vacuum cleaner in about 1900, and which was subsequently copied in the USA and elsewhere.
The mirror's blank was manufactured by Boostec in Tarbes, France; ground and polished by Opteon Ltd. in Tuorla Observatory, Finland; and coated by vacuum deposition at the Calar Alto Observatory in Spain.
The first recorded experimental work related to decompression was conducted by Robert Boyle, who subjected experimental animals to reduced ambient pressure by use of a primitive vacuum pump.
Dom Irrera as Mandrill Man Vacuum, the writer of Jivetime Jimmy's Revenge and who claims to have learned about African Americans only through film and television.
Variation of the first term of the action with respect to the tetrad gives the (mixed index) Einstein tensor and variation of the second term with respect to the tetrad gives a quantity that vanishes by symmetries of the Riemann tensor (specifically the first Bianchi identity), together these imply Einstein's vacuum field equations hold.
Some newer vacuum cleaners have high-efficiency particulate air filtration (HEPA) filters attached, which, when combined with the special bags, are effective in trapping almost 100% of allergens, including ragweed, dust mites, and grass pollen.
The death of Gilbert de Clare, the Lord of Glamorgan and the most prominent landowner in the south, at the battle of Bannockburn in June 1314, left a power vacuum in the region, and the heavy-handed response of the English Crown towards overseeing de Clare's lands there, combined with the death of several hundred men of Glamorgan at Bannockburn, precipitated a revolt in the lordship in late summer of that year.
Lovetune for Vacuum is the debut album by Austrian musical project Soap&Skin, released in 2009 on Play It Again Sam Records.
In his Questions on the Eight Books of the Physics, Marsilius cites ancient experiments with the clepsydra as proof that "nature abhors a vacuum."
It is even more dramatic when done in an environment that naturally has a vacuum, as David Scott did on the surface of the Moon during Apollo 15.
in Red Deer, Alberta, Canada, which manufactured truck- and trailer-mounted vacuum tanks and hydrovacs.
"Menna Fadali" born in 1983 participated in the cinema with many of the movies that initiated with the film "Basha telmiz" with "Karim Abdel Aziz" and "Gada Adel" and then "Youth Spicy," "Ghost," and "vacuum killer", and "there is no Usefulness, "and" Karaoke "and" light eyes "and" dealer "
The Menninger brothers set about training analysts, to fill the vacuum that existed at that time.
Sintered onto the inner surface of high vacuum vessels, the NEG coating can be applied even to spaces that are narrow and hard to pump out, which makes it very popular in particle accelerators where this is an issue.
The boats are mainly constructed by carbon composite techniques, such as dual surface vacuum core resin infusion, and can be configured to perform multi-role tasks in a broad range of operational environments.
David Oreck, business founder and father of Bruce, and the vacuum company that he founded.
A giant vacuum sucks up the riches of the earth to feed the factories of card-playing, hard-drinking white capitalist thugs, including John D. Rockefeller himself while workers rally behind the red flag of socialism and its standard-bearer, Lenin.
It was acclaimed by Jonathan Betts, the Senior Curator of Horology at the Royal Observatory, Greenwich as "the nearest approach to perfection by any mechanical timekeeper not employing a vacuum chamber".
Marcello Pirani (1880–1968) the German physicist and inventor of the Pirani vacuum gauge
William Eccles and F. W. Jordan (1919) describe a "trigger relay" made from a vacuum tube.
RIDGID's orange tools, sold exclusively in North America at Home Depot, are made by TTI the parent company of Milwaukee, AEG, Ryobi power tools Homelite, Hoover, Dirt Devil, and Vax.
The latter came in a silver box with the game and included a packet of 3" X 5" cards of character concept art from the game drawn by Tommy Yune, a lenticular card depicting a Veritech fighter in action, a Battlecry t-shirt vacuum packed into a disc-shaped tin with card RDF logo on top, the game's soundtrack on CD and a specially numbered Jack Archer dogtag.
In these wares, it was most famous for producing an ingenious style of pot that is filled from a hole in the bottom via a vacuum lock, known as a Cadogan.
Scharnhorst effect, a hypothetical phenomenon in which light signals travel faster between two closely spaced conducting plates than in a normal vacuum
The Schlenk line (also vacuum gas manifold) is a commonly used chemistry apparatus developed by Wilhelm Schlenk.
# The signal parameters are practically independent of external magnetic fields, in contrary to vacuum PMTs
Crookes radiometer, a light mill composed of an airtight glass bulb containing a partial vacuum.
In addition to the laboratory module, the complete set also included five external pallets for experiments in vacuum, built by British Aerospace (BAe) and a pressurized igloo containing the subsystems needed for the pallet-only flight configuration operation.
In the sitcom The Big Bang Theory, in Season 1 Episode 9, Leonard Hofstadter cited this joke with slight variation (as "spherical chickens in a vacuum").
Artificial vacuum was first produced in 1643 by Italian scientist Evangelista Torricelli and further developed by German scientist Otto von Guericke with his Magdeburg hemispheres.
The New York Times in September 2012 reported that “the Obama administration has fallen frustratingly short” in some of the three American goals in Iraq - to leave behind a stable representative government, avoid a power vacuum that neighboring states and terrorists could exploit and maintain influence so Iraq would be a partner or, at a minimum, not an opponent in the Middle East due to political and ethnic tensions.
Zetatron, a high-voltage vacuum tube device that generates a stream of neutrons
Guericke was driven to make a vacuum in order to disprove Aristotle's long-held supposition that 'nature abhors a vacuum'.
By the early 1930s, the professional wrestling industry was in transition following the break-up of the Gold Dust Trio and amidst the economic vacuum left by the Great Depression.
In 1970, Jack Herschorn purchased the Universal Audio mixing console and a number of other pieces of equipment from that studio including UA LA-76A and LA-76B limiting amplifiers, UA vacuum tube power amplifiers (which were actually Dynakit Stereo 70 and 50-watt mono amplifier kits assembled into rack-mount chassis), Fairchild Conax sibilance controllers, Langevin graphic equalizers and Cinema Engineering filters, all originally installed in United Studio A in 1957.
In the UK the pre-nationalisation railway companies standardised around systems operating on a vacuum of 21 inches of mercury (533.4 Torr), with the exception of the Great Western Railway, which used 25 inches of mercury (635 Torr).
In 1973, Edward Tryon proposed the zero-energy universe hypothesis: that the Universe may be a large-scale quantum-mechanical vacuum fluctuation where positive mass-energy is balanced by negative gravitational potential energy.
Vacuum sewers were first installed in Europe in 1882 but until the last 30 years it had been relegated to a niche market.
Vanadocene was first prepared in 1954 by Birmingham, Fischer, and Wilkinson via a reduction of vanadocene dichloride with aluminum hydride, after which vanadocene was sublimed in vacuum at 100 ˚C.