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Vacuum cleaner (5,776 words) [view diff] exact match in snippet view article find links to article

A vacuum cleaner, also known simply as a vacuum, is a device that uses suction, and often agitation, in order to remove dirt and other debris from carpets

Socony merged with Vacuum Oil Company, from which the Mobil name first originated, in 1931 and subsequently renamed itself to "Socony-Vacuum Oil Company".

in "inches of mercury vacuum" (inHg), down to a 30 inHg vacuum. Inches of mercury is also used in automotive cooling system vacuum test and fill tools.

ineffective. Physical techniques involve extension devices, hanging weights, and vacuum pressure. There is also significant overlap between techniques intended

In quantum physics, a quantum fluctuation (also known as a vacuum state fluctuation or vacuum fluctuation) is the temporary random change in the amount

A thermobaric weapon, also called an aerosol bomb, or a vacuum bomb, is a type of explosive munition that works by dispersing an aerosol cloud of gas,

discovery of the ultraviolet radiation with wavelengths below 200 nm, named "vacuum ultraviolet" because it is strongly absorbed by the oxygen in air, was made

England, the company designs and manufactures household appliances such as vacuum cleaners, air purifiers, hand dryers, bladeless fans, heaters, hair dryers

or solar cells where the current of interest is the reverse current. In vacuum tubes (including cathode-ray tubes) it is the negative terminal where electrons

The vacuum brake is a braking system employed on trains and introduced in the mid-1860s. A variant, the automatic vacuum brake system, became almost universal

automatic vacuum brake. This system was similar to the simple vacuum system, except that the creation of vacuum in the train pipe exhausted vacuum reservoirs

brand names (including its own), and are primarily major appliances and vacuum cleaners intended for home consumer use. Electrolux has a primary listing

Thrust is a reaction force described quantitatively by Newton's third law. When a system expels or accelerates mass in one direction, the accelerated mass

devices. Compared with the vacuum tube, transistors are generally smaller and require less power to operate. Certain vacuum tubes have advantages over

the vacuum, held the water in the tube. In a letter to Michelangelo Ricci in 1644 concerning the experiments, he wrote: Many have said that a vacuum does

non-gimbaled, vacuum-optimized Raptors (Raptor Vacuum) would provide primary thrust for the second stage, for a total of nine engines. Raptor Vacuums were envisioned

arsenide and germanium are also used. The obsolete thermionic diode is a vacuum tube with two electrodes, a heated cathode and a plate, in which electrons

Messier 109 (also known as NGC 3992 or the Vacuum Cleaner Galaxy) is a barred spiral galaxy exhibiting a weak inner ring structure around the central bar

the electric vacuum cleaner industry during most of the 20th century, to the point where the Hoover brand name became synonymous with vacuum cleaners and

amplify was the triode vacuum tube, invented in 1906 by Lee De Forest, which led to the first amplifiers around 1912. Vacuum tubes were used in almost

robotic vacuum cleaner, sometimes called a robovac or a roomba as a generic trademark, is an autonomous robotic vacuum cleaner which has a limited vacuum floor

fluctuations in electromagnetic fields (waves) propagate at a constant speed in vacuum, c (299792458 m/s). Known as electromagnetic radiation, these waves occur

were prone to explosion unless carefully operated. Vacuum safety valves (or combined pressure/vacuum safety valves) are used to prevent a tank from collapsing

easier. Today, modern street sweepers are mounted on truck bodies and can vacuum debris that accumulates in streets. The need for rubbish to be removed from

by Sir Joseph John Thomson, along with the subsequent invention of the vacuum tube which could amplify and rectify small electrical signals, inaugurated

or an aspirator. An ejector operates on similar principles to create a vacuum feed connection for braking systems etc. The motive fluid may be a liquid

Penetron (a 2 colour see-through CRT) A vacuum tube is based on current conduction through a vacuum (see Vacuum tube). Diode or rectifier tube Amplification

the mid-1920s, amplifying vacuum tubes revolutionized radio receivers and transmitters. John Ambrose Fleming developed a vacuum tube diode. Lee de Forest

separation process with a vacuum. For oxygen and nitrogen VSA systems, the vacuum is typically generated by a blower. Hybrid vacuum pressure swing adsorption

and vacuum bell use over 12 consecutive months. In an article by Interactive Cardiovascular and Thoracic Surgery, the results found that vacuum bell

of other vacuum-tube oscillators. Vacuum-tube feedback oscillators became the basis of radio transmission by 1920. However, the triode vacuum tube oscillator

speculative methods have also been proposed, like the Mach effect, the quantum vacuum plasma thruster or various hypotheses associated with resonant cavity thrusters

phases: Expanding vacuum state with high potential energy Phase transition to true vacuum Slow roll and reheating A "vacuum" or "vacuum state" in quantum

metre has been defined as the length of the path travelled by light in vacuum during a time interval of ⁠1/299792458⁠ of a second, where the second is

Diesel fuel, also called diesel oil, heavy oil (historically) or simply diesel, is any liquid fuel specifically designed for use in a diesel engine, a

symmetries, but the lowest-energy vacuum solutions do not exhibit that same symmetry. When the system goes to one of those vacuum solutions, the symmetry is

A phototube or photoelectric cell is a type of gas-filled or vacuum tube that is sensitive to light. Such a tube is more correctly called a 'photoemissive

principle, which allows the virtual particles to spontaneously emerge from vacuum at short time and space ranges. The concept of virtual particles arises

business as The Kirby Company (stylized as KIRBY), is a manufacturer of vacuum cleaners, home cleaning products and accessories, located in Cleveland,

Mahōbin Kabushiki Gaisha, lit. 'Tiger Vacuum Flask [Magic-jar] Corporation') is a Japanese manufacturer that applies vacuum insulation and heat control technology

scroll compressor (also called spiral compressor, scroll pump and scroll vacuum pump) is a device for compressing air or refrigerant. It is used in air

added to reduce cathode poisoning and sputtering. Although it resembles a vacuum tube in appearance, its operation does not depend on thermionic emission

conveyed by vacuum sewer. Pipelines range in size from pipes of 125 millimetres (4.9 in) in diameter up to 280 millimetres (11 in) in diameter. Vacuum sewer

X-rays, and gamma rays. All forms of EMR travel at the speed of light in a vacuum and exhibit wave–particle duality, behaving both as waves and as discrete

direction of current. Physically, rectifiers take a number of forms, including vacuum tube diodes, wet chemical cells, mercury-arc valves, stacks of copper and

have the solution, but it works only in the case of spherical cows in a vacuum." John Harte, who received his Ph.D. from the University of Wisconsin in

silicon, while the thermionic vacuum tubes it replaced worked by controlling a current of electrons or ions in a vacuum within a sealed tube. Although

the Kerr vacuum family (two parameters). In this sense, the Kerr vacuums are the simplest stationary axisymmetric asymptotically flat vacuum solutions

Mobil (at the time known as Socony-Vacuum) to be the anchor tenant, leasing nearly half of the structure. Socony-Vacuum would relocate from a headquarters

Mobil (at the time known as Socony-Vacuum) to be the anchor tenant, leasing nearly half of the structure. Socony-Vacuum would relocate from a headquarters

The Taub–NUT metric (/tɔːb nʌt/, /- ˌɛn.juːˈtiː/) is an exact solution to Einstein's equations. It may be considered a first attempt in finding the metric

rectifier. Thyratrons can handle much greater currents than similar hard-vacuum tubes. Electron multiplication occurs when the gas becomes ionized, producing

broadcasting was not established until the 1920s, following the development of vacuum tube receivers and transmitters. AM radio remained the dominant method of

ground-glass rim of the desiccator lid must be greased with a thin layer of vacuum grease, petroleum jelly or other lubricant to ensure an airtight seal. In

vanes which are dark on one side, and light on the other) in a partial vacuum spins when exposed to light. A common misbelief (one originally held even

carpets. Common methods include hot water extraction, dry-cleaning, and vacuuming. Hot water extraction, sometimes mistakenly called "steam cleaning", uses

time-varying signals. Many electronic devices, such as diodes, transistors and vacuum tubes, whose function is processing time-varying (AC) signals, also require

filtration techniques. To obtain solid products a vacuum filtration apparatus can be used. Vacuum filtration uses suction to pull liquid through a Büchner

valve, also called the Fleming oscillation valve, was a thermionic valve or vacuum tube invented in 1904 by English physicist John Ambrose Fleming as a detector

first practical electronic amplifier, the three-element "Audion" triode vacuum tube in 1906. This helped start the Electronic Age, and enabled the development

tube, a vacuum tube converting incident photons into an electric signal. Photomultiplier tubes (PMTs for short) are members of the class of vacuum tubes

A jumbotron, sometimes referred to as jumbovision, is a video display using large-screen television technology (video wall). The original technology was

exposed drive shafts. Low-powered consumer devices built before 1933, such as vacuum tube vehicle radio receivers, did not use expensive, noisy and bulky motor–generators

electromagnetic spectrum. They are members of the class of vacuum tubes, more specifically vacuum phototubes. These detectors multiply the current produced

founded the Dyson company. He is best known as the inventor of the bagless vacuum cleaner, which works on the principle of cyclonic separation. In the Sunday

named because they are emitted by the negative electrode, or cathode, in a vacuum tube. To release electrons into the tube, they first must be detached from

electromagnetic field and a positive vacuum energy, as well as a kind of vacuum perturbation of the Kerr vacuum which is specified by the so-called NUT

anode and cathode is different for electrical devices such as diodes and vacuum tubes where the electrode naming is fixed and does not depend on the actual

necrosis of left femoral head. Man of 45 years with AIDS. The intravertebral vacuum cleft sign (at white arrow) is a sign of avascular necrosis. Avascular necrosis

Hertzsprung–Russell diagram Spectral type O B A F G K M L T Brown dwarfs White dwarfs Red dwarfs Subdwarfs Main sequence ("dwarfs") Subgiants Giants Red

Kabushiki-gaisha) is a Japanese multinational manufacturer and marketer of vacuum flasks, beverage dispensers, and consumer electronics including bread machines

under the term vacuum casting. Vacuum pressure casting (VPC), properly referred to as vacuum assist direct pour, uses gas pressure and a vacuum to improve

Pair production is the creation of a subatomic particle and its antiparticle from a neutral boson. Examples include creating an electron and a positron

mansion to rescue Mario and battles ghosts by capturing them through a vacuum cleaner supplied by Professor E. Gadd. Luigi's Mansion received a positive

free of gas molecules. The WSF thus created an ultrahigh vacuum in its wake. The resulting vacuum was used to study epitaxial film growth. The WSF operated

military defense. The company's products include a range of autonomous home vacuum cleaners (Roomba), floor moppers (Braava), and other autonomous cleaning

slightly rotate, thereby advancing the ignition timing. Vacuum advance typically uses manifold vacuum to adjust the ignition timing, for example to improve

Baker, Jr. (high-frequency gravitational waves), James M. Bardeen (Bardeen vacuum, black hole mechanics, gauge-invariant linear perturbations of Friedmann-Lemaître

manufactures vacuum cleaners, including uprights, cordless, canisters, sticks and handhelds. Eureka also manufactures aftermarket vacuum accessories,

science, some of the most widely recognized being the speed of light in vacuum c, the gravitational constant G, the Planck constant h, the electric constant

military defense. The company's products include a range of autonomous home vacuum cleaners (Roomba), floor moppers (Braava), and other autonomous cleaning

slightly rotate, thereby advancing the ignition timing. Vacuum advance typically uses manifold vacuum to adjust the ignition timing, for example to improve

bagless vacuum cleaners (using cyclonic separation and brushless electric motors), heatless hand dryers, bladeless fans/heaters, and robotic vacuum cleaners

A vacuum dry box is a piece of safety equipment which can provide an inert, or controlled atmosphere for handling sensitive materials. These devices can

the company traces its roots as far back as 1866 to the founding of the Vacuum Oil Company, which would become part of ExxonMobil through its own merger

The Hartle–Hawking state, also known as the no-boundary wave function is a proposal in theoretical physics concerning the state of the universe prior to

household, as the core technology in bagless types of portable vacuum cleaners and central vacuum cleaners. Cyclones are also used in industrial and professional

chances of a spin. The vacuum booster or vacuum servo is used in most modern hydraulic brake systems which contain four wheels, the vacuum booster is attached

repulsion in the cosmological context. A field in a positive-energy false vacuum state could represent such a fluid, and the resulting repulsion would set

A central vacuum cleaner (also known as built-in or ducted) is a type of vacuum cleaner appliance installed into a building as a semi-permanent fixture

fried, vacuum fried, dehydrated or baked. Apple chips may have a dense and crispy texture or may be puffed, yet still crispy. Microwave vacuum-drying

to produce vacuum tubes. As time passed, production and elemental techniques of the vacuum tube transformed into the manufacturing of vacuum fluorescent

draws more fuel into the airstream. At the same time, the reduced manifold vacuum results in less fuel flow through the idle and off-idle circuits. During

Vacuum Oil Company was an American oil company. After being taken over by the original Standard Oil Company and then becoming independent again, in 1931

breakers. Today, oil-filled equipment has largely been replaced by air-blast, vacuum, or SF6 equipment, allowing large currents and power levels to be safely

maximum thrust of 7,530 kN (1,690,000 lbf) and the upper stage's single vacuum optimized Archimedes at 1,110 kN (250,000 lbf). It was expected to have

emitted into a solid rather than into a vacuum, the term internal photoemission is often used, and emission into a vacuum is distinguished as external photoemission

manifold. This provides full engine vacuum (and hence, full vacuum advance) at idle. Some vacuum advance units have two vacuum connections, one at each side

Buck Boost Buck–boost Split-pi Ćuk SEPIC Charge pump Switched capacitor Vacuum tubes Acorn tube Audion Beam tetrode Barretter Compactron Diode Fleming

26 Broadway, also known as the Standard Oil Building or Socony–Vacuum Building, is an office building adjacent to Bowling Green in the Financial District

indicator, in technical literature called an electron-ray indicator tube, is a vacuum tube which gives a visual indication of the amplitude of an electronic signal

theorem, the Schwarzschild metric is the most general spherically symmetric vacuum solution of the Einstein field equations. A Schwarzschild black hole or

Aircraft toilets were historically chemical toilets, but many now use a vacuum flush system instead. Early aircraft fitted with a toilet include the 1919

and dirt. Vacuum-packed banknotes also take up less space in containers used for transportation. Currency units are vacuum packed using a vacuum sealer.

Vacuum Diagrams is a collection of science fiction short stories by British writer Stephen Baxter. The collection connects the novels of the Xeelee Sequence

Bissell Inc., also known as Bissell Homecare, is an American privately owned vacuum cleaner and floor care product manufacturing corporation headquartered in

and similar specialty metal industries. Vacuum arc remelting (VAR) is a secondary remelting process for vacuum refining and manufacturing of ingots with

etc.) is softened by heat and draped over the product on the card/tray. Vacuum is used to assist a firm fit. The film bonds to the heat-seal coating on

travel, and t is the time at which the wave is described. Plane waves in vacuum are the simplest case of wave propagation: no geometric constraint, no interaction

Compactrons are a type of vacuum tube, which contain multiple electrode structures packed into a single enclosure. They were designed to compete with early

target in straight lines and impact energetically on the substrates or vacuum chamber (causing resputtering). Alternatively, at higher gas pressures,

freeze dried. Fresh fruit is frozen and placed in a drying chamber under a vacuum. Heat is applied, and water evaporates from the fruit while it is still

system is a pressurized liquid, the MS analyzers commonly operate under high vacuum. Thus, it is not possible to directly pump the eluate from the LC column

this solution in 1916. According to Birkhoff's theorem, it is the only vacuum solution that is spherically symmetric. This means there is no observable

A klystron is a specialized linear-beam vacuum tube, invented in 1937 by American electrical engineers Russell and Sigurd Varian, which is used as an amplifier

in terms of architecture and implementation. Like the 701, the 704 used vacuum-tube logic circuitry, but increased the instruction size from 18 bits to

transistors replaced vacuum tubes in computer designs, giving rise to the "second generation" of computers. Compared to vacuum tubes, transistors have

currently exists in a false vacuum and that it could become a true vacuum at any moment. In order to best understand the false vacuum collapse theory, one must

five electrodes. The term most commonly applies to a three-grid amplifying vacuum tube or thermionic valve that was invented by Gilles Holst and Bernhard

electron gun (also called electron emitter) is an electrical component in some vacuum tubes that produces a narrow, collimated electron beam that has a precise

An automated vacuum waste collection system, also known as pneumatic refuse collection, or automated vacuum collection (AVAC), transports waste at high

Unsolved problem in physics: Why is the vacuum energy density much smaller than a zero-point energy suggested by quantum field theory? (more unsolved problems

industry had been making technical advances, particularly in the area of vacuum tube technology and GE needed access to additional patents before its new

A vacuum servo is a component used on motor vehicles in their braking system, to provide assistance to the driver by decreasing the braking effort. In

Vacuum-tube computers, now called first-generation computers, are programmable digital computers using vacuum-tube logic circuitry. They were preceded

felt insulation between two vacuum-tight layers of rubber; this vacuum layer insulates the wearer's feet similar to a vacuum flask.[citation needed] These

The nuvistor is a type of vacuum tube announced by RCA in 1959. Nuvistors were made to compete with the then-new bipolar junction transistors, and were

equalization devices, preamplifiers and amplifiers (both solid-state and vacuum tube), loudspeakers (including horn, electrostatic and magnetostatic speakers)

Sous vide (/suː ˈviːd/; French for 'under vacuum'), also known as low-temperature, long-time (LTLT) cooking, is a method of cooking invented by the French

and handled finances and sales. In 1927, Miele started the production of vacuum cleaners. In 1929, the first electric dishwasher in Europe was produced

dispersion for various needs. Vacuum cleaner nozzles come in several different shapes. Vacuum nozzles are used in vacuum cleaners. Some nozzles are shaped

freezing point −210 °C (−346 °F; 63 K) by placing it in a vacuum chamber pumped by a vacuum pump. Liquid nitrogen's efficiency as a coolant is limited

Beam deflection tubes, sometimes known as sheet beam tubes, are vacuum tubes with an electron gun, a beam intensity control grid, a screen grid, sometimes

A gyrotron is a class of high-power linear-beam vacuum tubes that generates millimeter-wave electromagnetic waves by the cyclotron resonance of electrons

A thermal cooker, or a vacuum flask cooker, is a cooking device that uses thermal insulation to retain heat and cook food without the continuous use of

nine active electrodes. The term most commonly applies to a seven-grid vacuum tube, also sometimes called an enneode. An example was the EQ80/UQ80, which

dependent and invented by Alexander Zarchin, freezes seawater in a vacuum. Under vacuum conditions the ice, desalinated, is melted and diverted for collection

vacuum sealed. The vacuum system for evacuating a TEM to an operating pressure level consists of several stages. Initially, a low or roughing vacuum is

unique contribution was to make computing faster by being the first to use vacuum tubes to do arithmetic calculations. Prior to this, slower electro-mechanical

generations prior to its incorporation, developed steam cleaners and upright vacuums. In 2003, Rosenzweig moved the headquarters from Montreal to Needham, Massachusetts

chips. In the past, processors were constructed using multiple individual vacuum tubes, multiple individual transistors, or multiple integrated circuits

Terra nullius (/ˈtɛrə ˈnʌlɪəs/, plural terrae nullius) is a Latin expression meaning "nobody's land". Since the nineteenth century it has occasionally

magnetic field it produces. Similarly, measuring the speed of light in vacuum seems to give the identical result, whatever the location in time and space

and the sale of household products (Thermomix kitchen appliance, Kobold vacuum cleaner) mainly via direct sales. Akf Bank, founded in 1968, is a subsidiary

In vacuum tubes and gas-filled tubes, a hot cathode or thermionic cathode is a cathode electrode which is heated to make it emit electrons due to thermionic

In vacuum tubes and gas-filled tubes, a hot cathode or thermionic cathode is a cathode electrode which is heated to make it emit electrons due to thermionic

earlier acoustic delay-line memory, at the speed of the electrons inside the vacuum tube, rather than at the speed of sound. The system was adversely affected

of America (RCA) under the direction of Vladimir K. Zworykin. It was a vacuum tube that stored digital data as electrostatic charges using technology

sometimes called physical vapor transport (PVT), describes a variety of vacuum deposition methods which can be used to produce thin films and coatings

defined differently than in chemistry and atomic physics. For a semiconductor-vacuum interface (that is, the surface of a semiconductor), electron affinity,

hypothetical particle falling to the center of its star. Quantum processes create vacuum polarization, producing a form of degeneracy pressure preventing spacetime

includes the more common suction curettage procedures of manual and electric vacuum aspiration. D&Cs may be performed in pregnant and non-pregnant patients

combustion engine. The system usually consists of a tube, a one-way valve and a vacuum source (such as the inlet manifold). The unwanted gases, called "blow-by"

second stage booster uses a single KRE-075 Vacuum engine, which has a wider nozzle for increased efficiency in vacuum with a specific impulse of 315.4 seconds

amplifier or tube amplifier is a type of electronic amplifier that uses vacuum tubes to increase the amplitude or power of a signal. Low to medium power

maintain the patient in a supine alignment during transfer to a stretcher, vacuum mattress or long spine board). They are more comfortable than a long spine

from the bottom. The flasks are used to cooperate with vacuum aspirator or vacuum pumps in the vacuum filtration, or as additional security during the distillation

Pfeiffer Vacuum Technology AG is a German manufacturer of vacuum pumps. It is headquartered in Aßlar in Germany with 70% of the total production catering

In quantum field theory, and specifically quantum electrodynamics, vacuum polarization describes a process in which a background electromagnetic field

of exponential expansion that was driven by a positive vacuum energy density (negative vacuum pressure). The results of the WMAP mission in 2006 made

A tetrode is a vacuum tube (called valve in British English) having four active electrodes. The four electrodes in order from the centre are: a thermionic

McNally tube, named by its developer). The reflex klystron is a type of vacuum tube used to generate microwaves. It is a low-power device used primarily

in 1933. His thesis, "Vacuum Electrostatic Engineering," examined the factors governing voltage-insulation strength in vacuums. In addition to his work

In general relativity, a vacuum solution is a Lorentzian manifold whose Einstein tensor vanishes identically. According to the Einstein field equation

typically passive. Vacuum and radio frequency kilns reduce the air pressure to attempt to speed up the drying process. A variety of these vacuum technologies

"quantum vacuum virtual plasma", a new term he coined. Baez and Carroll criticized this explanation, because in the standard description of vacuum fluctuations

The inductive output tube (IOT) or klystrode is a variety of linear-beam vacuum tube, similar to a klystron, used as a power amplifier for high frequency

A beam tetrode, sometimes called a beam power tube, is a type of vacuum tube or thermionic valve that has two grids and forms the electron stream from

extraction. The operator would park the van near the premises, connect the vacuum hose and solution line hose into the machine, bring the hoses into the building

electron in the vacuum as a reference point for energies. This approach is not advisable unless one is careful to define exactly where the vacuum is. The problem

calculating device. When high tech becomes old, it becomes low tech, for example vacuum tube electronics. Further, high tech is related to the concept of mid-tech

action of these generators, and can thus be excited out of the asymmetric vacuum by these generators. Thus, they can be thought of as the excitations of

manifold. An initial data set (M, g, k) satisfies the vacuum constraint equations, or is said to be a vacuum initial data set, if the following two equations

trigger allergy and asthma symptoms. For a HEPA filter in a vacuum cleaner to be effective, the vacuum cleaner must be designed so that all the air drawn into

computed result. By the end of its operation in 1956, ENIAC contained 18,000 vacuum tubes, 7,200 crystal diodes, 1,500 relays, 70,000 resistors, 10,000 capacitors

A vacuum-tube computer, now termed a first-generation computer, is a computer that uses vacuum tubes for logic circuitry. While the history of mechanical

automatically by a vacuum system that draws the ambient air pressure down from 15 to 21 pounds per square inch (100 to 140 kPa) of vacuum. The vacuum is also used

includes several different, incompatible processor architectures. The 700s use vacuum-tube logic and were made obsolete by the introduction of the transistorized

acorn tube, or acorn valve, refers to any member of a family of VHF/UHF vacuum tubes starting just before World War II. They were named after their resemblance

configuration) was about 20,516 pounds (10.3 short tons; 9.3 t). The system used vacuum tube logic circuitry and electrostatic storage, consisting of 72 Williams

University and was built by its students, faculty and staff in 1957. Powered by vacuum tubes, its design was based on ILLIAC, the supercomputer built at University

in which he deliberately suffocated two kittens in a plastic bag with a vacuum cleaner. He later published a second video of himself, this time drowning

fluid left on an infant's head after they have been delivered by vacuum extraction. A vacuum extraction is a type of assistance used during vaginal delivery

The manual vacuum cleaner was a type of non-electric vacuum cleaner, using suction to remove dirt from carpets, being powered by human muscle, similar

system until 1970, totalling over 13 years of service. UNIVAC I used 6,103 vacuum tubes, weighed 16,686 pounds (8.3 short tons; 7.6 t), consumed 125 kW, and

includes several different, incompatible processor architectures. The 700s use vacuum-tube logic and were made obsolete by the introduction of the transistorized

surface of an icy body and the column of rising water is exposed to the near-vacuum of the surface of most icy bodies, it will immediately start to boil, because

the toy problem Vacuum World has a discrete finite state space in which there are a limited set of configurations that the vacuum and dirt can be in

The pentagrid converter is a type of radio receiving valve (vacuum tube) with five grids used as the frequency mixer stage of a superheterodyne radio receiver

University and was built by its students, faculty and staff in 1957. Powered by vacuum tubes, its design was based on ILLIAC, the supercomputer built at University

diverse electrical equipment, including at various times radio transceivers, vacuum tubes, semiconductors, and mainframe computers such as MOBIDIC. They were

performance achieved was double that number. Employing approximately 1,700 vacuum tubes, the computer's word length was 33 bits. It had an ultrasonic mercury

Air Missile Test Center at Point Mugu, California. The RAYDAC used 5,200 vacuum tubes and 18,000 crystal diodes. It had 1,152 words of memory (36 bits per

structure surrounding the vacuum vessel and the superconducting magnets, with the purpose of providing a super-cool vacuum environment. Its thickness

voltage constant at a predetermined level. Physically, these devices resemble vacuum tubes, but there are two main differences: Their glass envelopes are filled

atmospheric pressure. Vacuum pumps: A vacuum pump sucks air or air/steam mixtures from the chamber. Superatmospheric cycles: Achieved with a vacuum pump. It starts

The Standard Vacuum Oil Company was an American joint venture by Standard Oil of New Jersey and Socony-Vacuum Oil (aka Mobil) established in 1931 to make

system of a two-level atom interacting with a quantized field mode (i.e. the vacuum) within an optical cavity. It gave the nonintuitive prediction that the

in various physical sizes, ranging from smaller than a 7-pin miniature vacuum tube to as large as an octal base tube. While most dekatrons are decimal

Audion tube, invented in 1906 by Lee de Forest, solved these problems. The vacuum tube feedback oscillator, invented in 1912 by Edwin Armstrong and Alexander

bench by a vise-type screw on its base which rarely is able to pivot. A vacuum-mounted vise is a small engineer's vise secured by a suction cup base and

spacetime vacuum lacking vacuum energy). Quantum mechanics heavily favors smaller fluctuations that "borrow" the least amount of energy from the vacuum. Typically

Enhancement mode, P‑channel MOSFET Vacuum tube diode Vacuum tube triode Vacuum tube tetrode (pin letters not part of symbol) Vacuum tube pentode For multiple pole

nitrocarburizing is also known as controlled nitrocarburizing, soft nitriding, and vacuum nitrocarburizing. The process works to achieve the same result as the salt

as chief executive. Among the products Bodum markets are French presses, vacuum coffee brewers (the "Santos" and "Pebo"), and double-walled beverage glasses

array drivers all used vacuum tubes, the read sense amplifiers were a very early use of transistors in computing. List of vacuum tube computers IBM 740

carpet at high pressure and the lifted soil being removed by a powerful vacuum. Though commonly called "steam cleaning", no actual steam is involved in

which uses discrete transistors instead of vacuum tubes. The first generation of electronic computers used vacuum tubes, which generated large amounts of

The second stage of the Falcon 9 has 1 short or regular nozzle, Merlin 1D Vacuum engine version. Falcon 9 is capable of losing up to 2 engines and still

It can also be connected to a septic tank. A vacuum toilet is a flush toilet that is connected to a vacuum sewer system, and removes waste by suction.

wave oscillator (BWO), also called carcinotron or backward wave tube, is a vacuum tube that is used to generate microwaves up to the terahertz range. Belonging

tube Evacuated tube solar cookers are essentially vacuum sealed between two layers of glass. The vacuum allows the tube to act both as a "super" greenhouse

{\displaystyle \phi =1} , become exact vacuum solutions in Brans–Dicke theory, but some spacetimes which are not vacuum solutions to the Einstein field equation

to a vacuum can be found in both space exploration and high-altitude aviation. Research and experience have shown that while exposure to a vacuum causes

"grid Audion" vacuum-tube. How vacuum tubes worked was not understood at the time. De Forest's initial Audions did not have a high vacuum and developed

Canadian inventor and pioneer in the radio industry who founded the Rogers Vacuum Tube Company and the CFRB radio station in Toronto, Ontario. His only child

sewerage Storm drain Sanitary sewers not relying solely on gravity include: Vacuum sewer Effluent sewer Pressure sewer Where a sewerage system has not been

Buck Boost Buck–boost Split-pi Ćuk SEPIC Charge pump Switched capacitor Vacuum tubes Acorn tube Audion Beam tetrode Barretter Compactron Diode Fleming

rocket using a cluster of nine identical engines on the first stage, and one vacuum-optimized version with a longer nozzle on the second stage. This arrangement

energy would not prevent a star being created by a quantum transition of the vacuum. George Gamow recounted putting this idea to Albert Einstein: "Einstein

A vacuum arc thruster (VAT) is a form of electric spacecraft propulsion. It uses a vacuum arc discharge, across an insulator, between two electrodes to

the SMH Group Stadium in June 2023. The ground's four stands are: The LMD Vacuum Excavation (West) Stand, Motan Colortronic (South) Stand, Auto Windscreen

vacua are usually labeled by the vacuum expectation values of scalar fields, as Lorentz invariance forces the vacuum expectation values of any higher

nitrogen. It is also possible to use a glovebox for manipulation of items in a vacuum chamber. The gas in a glovebox is pumped through a series of treatment devices

may also be accomplished by decantation and centrifugation followed by vacuum drying; or direct from cream by breaking the emulsion followed by centrifugation

Whirlwind I was a Cold War-era vacuum-tube computer developed by the MIT Servomechanisms Laboratory for the U.S. Navy. Operational in 1951, it was among

electric blues originally obtained an overdriven sound by turning up their vacuum tube-powered guitar amplifiers to high volumes, which caused the signal

Forward, Robert L. (15 August 1984). "Extracting electrical energy from the vacuum by cohesion of charged foliated conductors". Physical Review B. 30 (4):

and wedge brakes. Most modern passenger vehicles, and light vans, use a vacuum assisted brake system that greatly increases the force applied to the vehicle's

energy would not prevent a star being created by a quantum transition of the vacuum. George Gamow recounted putting this idea to Albert Einstein: "Einstein

both for measuring the fluid flow and for moving other fluids (e.g. in a vacuum ejector). In inviscid fluid dynamics, an incompressible fluid's velocity

sandwiches or on a tray. They can be purchased canned, pre-sliced, usually in vacuum packs, or they can be sliced to order, most often in delicatessens and charcuteries

using a vacuum-gas manifold, also known as a Schlenk line. This involves pumping the air out of the flask and replacing the resulting vacuum with an inert

of earth profile that blocks off long-distance communications. Since the vacuum line of sight passes at varying heights over the Earth, the propagating

in flat space. This state is usually called the Bunch–Davies vacuum or Euclidean vacuum, actually was first obtained by N.A. Chernikov and E. A. Tagirov

stations utilize a water spray equipped vacuum building. All individual CANDU units on site are connected to this vacuum building by a large pressure relief

the universe), possibly from a primeval state, such as a false vacuum, quantum vacuum or virtual particle, in a currently unknown manner. Scientists are

Astronomical Union (IAU), a light-year is the distance that light travels in vacuum in one Julian year (365.25 days). Despite its inclusion of the word "year"

Buck Boost Buck–boost Split-pi Ćuk SEPIC Charge pump Switched capacitor Vacuum tubes Acorn tube Audion Beam tetrode Barretter Compactron Diode Fleming

infinitely many varieties, and that they have always existed. They float in a vacuum, which Democritus called the "void", and they vary in form, order, and posture

seen in the previous example: from any of the vacuum states it is possible to access any other vacuum state with only a small amount of energy, by moving

pumps push fluid to the surface, rather than jet pumps, which create a vacuum and rely upon atmospheric pressure. Submersibles use pressurized fluid from

A Perfect Vacuum (Polish: Doskonała próżnia) is a 1971 book by Polish author Stanisław Lem, the largest and best known collection of Stanisław Lem's fictitious

The use of transistors allowed the device to be much smaller than earlier vacuum tube radios. Akio Morita and Masaru Ibuka, then operating under the business

In the early days of electronics, devices that used vacuum tubes (called valves in British contexts), such as radios, were powered by batteries. Each battery

particles are massless. At a critical temperature, the Higgs field develops a vacuum expectation value; some theories suggest the symmetry is spontaneously broken

they are O-plasma vacuum cleaned (and/or vacuum baked) to reach out-gassing performance similar to Teflon while reaching vacuum leak tightness (permeability

high-speed travel utilizing the Hyperloop concept which was a variant of the vacuum train. The company was established on June 1, 2014, and reorganized and

displays, although small coils are still used as leak detectors for high-vacuum systems. Originally, Tesla coils used fixed spark gaps or rotary spark gaps

from 'nothing' (referring to the quantum vacuum). Philosopher Michael Martin has also appealed to quantum vacuum fluctuation models to support the idea

receiver that uses transistor-based circuitry. Previous portable radios used vacuum tubes, which were bulky, fragile, had a limited lifetime, consumed excessive

efficient with energy usage. In a vacuum, water boils at a lower temperature. In addition to increased speed, a vacuum kiln can also produce an improved

Submersible pump Tap (valve) Thermostatic mixing valve Trench drain Vacuum breaker Vacuum ejector Valve Water tank Zone valve Plumbing fixtures Accessible

30 centimeters are called microwaves. Like all electromagnetic waves, radio waves in vacuum travel at the speed of light, and in the Earth's atmosphere at a slightly

Vacuum is a Swedish pop band consisting of Mattias Lindblom and Anders Wollbeck. They also work as song writers and producers under the same name. As songwriters

reels by storing a short length of tape in the vacuum column under relatively low tension. The vacuum columns are chambers open at one end, the openings

Zanussi (Italian: [dzaˈnussi]) is an Italian producer of home appliances that was bought by Electrolux in 1984. Zanussi has been exporting products from

and the vacuum is pulled and set aside to allow the piece to cure (harden). There are three ways to apply the resin to the fabric in a vacuum mold. The

correlation functions, often referred to as correlators or Green's functions, are vacuum expectation values of time-ordered products of field operators. They are

physicist and electrical engineer who made contributions to the development of vacuum tubes, and invented the magnetron. He was a member of the National Academy

apparatus. A Büchner flask is a common design modification for filtration under vacuum. The slanted sides and narrow neck of this flask allow the contents of the

reels by storing a short length of tape in the vacuum column under relatively low tension. The vacuum columns are chambers open at one end, the openings

correlation functions, often referred to as correlators or Green's functions, are vacuum expectation values of time-ordered products of field operators. They are

values of gm for a small-signal vacuum tube are 1 to 10 mS. It is one of the three characteristic constants of a vacuum tube, the other two being its gain

with the use of different procedures including use of an abortion pill, vacuum aspiration, or dilation and evacuation. Since February 2000, the use of

A vacuum mattress, or vacmat, is a medical device used for the immobilisation of patients, especially in case of a vertebra, pelvis or limb trauma (especially

above, since the radian is dimensionless. For electromagnetic radiation in vacuum, wavenumber is directly proportional to frequency and to photon energy.

which removes water from the paper by sucking it out of suspension via vacuum. Press section, where the wet fibre web passes between large rolls loaded

small steam locomotive A vacuum flange is a flange at the end of a tube used to connect vacuum chambers, tubing and vacuum pumps to each other. In microwave

album included a bonus 3" CD, Vacuum Tracks. This bonus material consists of five drone tracks similar to the track "Vacuum Garden". The song "Hello Meow"

light to travel 1 foot in vacuum. 3.3356409519815 nanoseconds (by definition) – time taken by light to travel 1 metre in vacuum. 8 nanoseconds – typical

resulting in high-quality ingots. This process can be started up through vacuum induction melting. The ESR process uses the as-cast alloy as a consumable

into a cavity which is under vacuum in resin transfer moulding. Resin is entirely pulled into cavity under vacuum in vacuum-assisted resin transfer moulding

that vacuum was increased in the vacuum brake cylinder to apply the brakes, this being contrary to normal British railway practice, in which the vacuum is

specialists in making vacuum tube amplifiers. One of the traits of Luxman equipment from this era is the quality and warmth of the vacuum tube sound, paired

A crossed-field amplifier (CFA) is a specialized vacuum tube, first introduced in the mid-1950s and frequently used as a microwave amplifier in very-high-power

Westinghouse air brakes and dual air and vacuum brakes were provided for the train. For operations in the Netherlands, the vacuum brake equipment was disconnected

thrust-to-weight ratio of 34.7 and a specific impulse of 442 seconds (4.33 km/s) in vacuum. On 28 April 2015, CE-20 cleared a 635 seconds long duration hot test at

Only one BESM-1 machine was built. The machine used approximately 5,000 vacuum tubes. At the time of completion, it was the fastest computer in Europe

since been replaced by other display devices such as light emitting diodes, vacuum fluorescent displays, and liquid crystal displays. Since at least the 1940s

further removed from this sheet by pressing, sometimes aided by suction or vacuum, or heating. Once dry, a generally flat, uniform and strong sheet of paper

The Ozsváth–Schücking metric, or the Ozsváth–Schücking solution, is a vacuum solution of the Einstein field equations. The metric was published by István

of the apparatus 4. A vacuum is applied (usually via a water aspirator via the vacuum inlet). The NMR tube cap forms a vacuum seal. Solvent 7 is drawn

who spoke about Tibetan human rights before performing on Universal Horn/Vacuum Jam and Brian And Robert playing tibetan horn and wood flute. "My Friend

Long March 7. During early 2012, the engine system successfully passed vacuum testing. It is China's first upper stage rocket engine to adopt the staged-combustion

The control grid is an electrode used in amplifying thermionic valves (vacuum tubes) such as the triode, tetrode and pentode, used to control the flow

The Cyclone is a vacuum-tube computer, built by Iowa State College (later University) at Ames, Iowa. The computer was commissioned in July 1959. It was

Hence it is usually assembled into a vessel, similar in construction to a vacuum flask or Dewar. Cryostats have numerous applications within science, engineering

gel is always used to help the pump maintain a vacuum, in the same way vacuum grease is used with a vacuum pump in scientific applications. The gel also

quantities computed in an excited state and the same quantities computed in the vacuum state. For example, given a spatial region V {\displaystyle V} , Casini

sublimates directly from a solid to a gas. The ice cream is first placed in a vacuum chamber and frozen until any remaining water crystallizes. The air pressure

contributors. The DASK was a vacuum tube machine based on the Swedish BESK design. As described in 1956, it contained 2500 vacuum tubes, 1500 solid-state elements

extremizing the effective action yields the equations of motion for the vacuum expectation values of the quantum fields. The effective action also acts

A Rotary Vacuum Filter Drum consists of a cylindrical filter membrane that is partly sub-merged in a slurry to be filtered. The inside of the drum is held

Chicago, Illinois, filed her patent for the first vacuum coffee maker that truly automated the vacuum brewing process, while eliminating the need for a

sublimates directly from a solid to a gas. The ice cream is first placed in a vacuum chamber and frozen until any remaining water crystallizes. The air pressure

corrosion on the rails caused by human waste. They were replaced with bio-vacuum toilets, which use bacteria to decompose human waste, fulfilling a phaseout

back end of the needle. The vacuum in the tube then automatically draws the needed blood directly from the vein. Multiple vacuum tubes can be attached to

configuration): about 24,645 pounds (12.3 short tons; 11.2 t). List of vacuum-tube computers Pugh, Emerson W.; Johnson, Lyle R.; Palmer, John H. (1991)

quantities computed in an excited state and the same quantities computed in the vacuum state. For example, given a spatial region V {\displaystyle V} , Casini

contributors. The DASK was a vacuum tube machine based on the Swedish BESK design. As described in 1956, it contained 2500 vacuum tubes, 1500 solid-state elements

The Cyclone is a vacuum-tube computer, built by Iowa State College (later University) at Ames, Iowa. The computer was commissioned in July 1959. It was

scaling. Crystallization is done with a single-effect vacuum boiling pan and a crystallizer. In the vacuum pan, the syrup is evaporated until it gets supersaturated

the 1920s and 1930s, such as the Trautonium, were built with a variety of vacuum-tube (thermionic valve) and electro-mechanical technologies. After the 1960s

of the ejected electrons. XPS requires high vacuum (residual gas pressure p ~ 10−6 Pa) or ultra-high vacuum (p < 10−7 Pa) conditions, although a current

and voltage. The SIT has a current-voltage characteristic similar to a vacuum tube triode and it was therefore used in high-end audio products, including

relativity. It describes an anisotropic universe without matter (i.e., it is a vacuum solution). It can be written in any spacetime dimension D > 3 {\displaystyle

12AX7 (also known as ECC83) is a miniature dual-triode vacuum tube with high voltage gain. Developed around 1946 by RCA engineers in Camden, New Jersey

used in the 1930s. Originally made of asbestos fabric, current models use vacuum-deposited aluminized materials. Fire proximity suits first appeared during

sample insertion used. The gaseous and highly volatile liquid samples use a vacuum manifold, solids and less volatile liquids use a direct insertion probe

entitled to participate. The inaugural tournament was held in 2015 to fill the vacuum of the Indonesia Super League when Indonesia was suspended by FIFA for government

home appliances including refrigerators, washing machines, tumble dryers, vacuum cleaners, air conditioners and microwave ovens. In June 2014, LG Electronics

concluded that in a perfect Vacuum it would pass any distance without the least Obstruction. But having made a perfect Vacuum by means of boil’d Mercury

pulse transformer, vacuum tank, toroidal and poloidal field coils, and a limiter. The support structure positioned and supported the vacuum tank which also

medium-voltage AC motor controllers use vacuum contactors. High voltage AC contactors (greater than 1,000 volts) may use vacuum or an inert gas around the contacts

until the rubber cup is flattened. The cup is then pulled out, creating a vacuum to pull blockage material upward and dislodge waste or other material. The

deal with light liquid cargo within a local community. A common example is vacuum truck used to empty several septic tanks and then deliver the collected

CA (Casa Chica). Einziger began crafting an orchestral composition "End.>vacuum" following surgery in March 2007 for carpal tunnel syndrome, a repetitive-strain

– Staged combustion Propellant Combination – LOX / LH2 Maximum thrust (Vacuum) – 73.55 kN Operating Thrust Range (as demonstrated during GSLV Mk2 D5 flight)

operate amateur radio equipment from bygone years, such as those using vacuum tube technology. Popular modes of operation include speaking over amplitude

rocket. The engine produces 80 kilonewtons (18,000 lbf) of thrust in a vacuum. LandSpace completed the first engine hot firing test for TQ-11 on November

point in the serial memory's recirculation cycle. The computer had 5,937 vacuum tubes and 12,000 diodes, and consumed 56 kW of power. It covered 490 ft²

(1602-1686) invented the vacuum pump, a device that can draw out air or gas from the attached vessel. He demonstrated the vacuum pump to separate the pairs

microorganisms; used extensively in the medical and food industries Vacuum cleaning, using a vacuum cleaner Some items and materials require specialized cleaning

the Titan II and later were switched to Aerozine 50/N2O4. This engine was vacuum optimized and ran the gas-generator cycle. The thrust chamber used fuel

generally carried out through flash vacuum pyrolysis (FVP). In a typical FVP apparatus, a sample is sublimed under high vacuum (0.1-1.0 mmHg), heated in the

It is one of the major producers of vacuum cleaners in the United Kingdom, producing the Henry domestic vacuum cleaner and its related models, which

Massachusetts as a process-development company employing high-vacuum technology. It developed high-vacuum processes to produce penicillin, blood plasma, and streptomycin

2302 Dad offers to help Thundercleese win the heart of his true love, a vacuum cleaner, even though he bought it for his own use. Zorak burns things, including

Nathan Rosen, are connections between areas of space that can be modeled as vacuum solutions to the Einstein field equations, and that are now understood to

Sea level: 1,200 kN (270,000 lbf) Vacuum: 1,340 kN (300,000 lbf) Total thrust Sea level: 4,800 kN (1,100,000 lbf) Vacuum: 5,360 kN (1,200,000 lbf) Specific

record was set for the number of people (four) simultaneously exposed to the vacuum of space. The crew also contributed to breaking the record for the most

powering the first stage, while the second stage will be powered by a single vacuum-optimized engine. The engine successfully completed its first full-power

fringe.[citation needed] Bioslurping combines elements of bioventing and vacuum-enhanced pumping of free-product that is lighter than water (light non-aqueous

English engineer, best known for having invented one of the first powered vacuum cleaners. He also designed Ferris wheels, suspension bridges and factories

Submersible pump Tap (valve) Thermostatic mixing valve Trench drain Vacuum breaker Vacuum ejector Valve Water tank Zone valve Plumbing fixtures Accessible

{\displaystyle \Box \phi =4\pi \,\rho } . This has the result of changing the vacuum field equation from the Laplace equation to the wave equation, which means

Aluminium was used for panels, luggage racks, window frames, vacuum pipes and fuel and vacuum tanks. The corrugated steel floor was filled with sprayed asbestos

marketing network. Socony-Vacuum had Asian marketing outlets supplied remotely from California. In 1933, Jersey Standard and Socony-Vacuum merged their interests

aspects of life from the cradle to the grave and beyond – it fills a growing vacuum in modern life", as Pandit Jawaharlal Nehru observed when he first visited

Sea level: 1,200 kN (270,000 lbf) Vacuum: 1,340 kN (300,000 lbf) Total thrust Sea level: 4,800 kN (1,100,000 lbf) Vacuum: 5,360 kN (1,200,000 lbf) Specific

Inc. Archived from the original on 5 March 2012. Retrieved 21 May 2016. "Vacuum light sources - High speed stroboscopic light sources" (PDF). Ferranti Instruments

A vacuum ceramic filter is designed to separate liquids from solids for dewatering of ore concentrates purposes. The device consists of a rotator, slurry

placed along its periphery. The stream of air is provided by a vacuum system, driven by a vacuum pump, or a venturi. Air passing through the narrowest portion

powering the first stage, while the second stage will be powered by a single vacuum-optimized engine. The engine successfully completed its first full-power

cyclic particle accelerator for electrons. It consists of a torus-shaped vacuum chamber with an electron source. Circling the torus is an iron transformer

the effectiveness of the vacuum insulation. The effectiveness of the vacuum insulation is also related to the area of the vacuum panels. Bulk insulators

pressures are necessary. To achieve these low pressures, a vacuum chamber is needed. The vacuum chamber typically includes windows so that the atoms can

installed machines: 9  weighed 250 tons. The AN/FSQ-7 used a total of 60,000 vacuum tubes (49,000 in the computers): 9  and up to 3 megawatts of electricity

which the base physical units are chosen so that the speed of light in vacuum, c, and the gravitational constant, G, are set equal to unity. c = 1   {\displaystyle

Console Unit housed the magnetic drum storage, arithmetical device (using vacuum tubes) and the operator's console. IBM 655 Power Unit IBM 533 or IBM 537

Qingxu Daode Zhenjun (Chinese: 清虛道德真君; pinyin: Qīngxū Dàodé Zhēnjūn) is a character featured within the famed classic Chinese novel Investiture of the

were:" The concept of a vacuum (i.e. a reduction in pressure below ambient) The concept of pressure Techniques for creating a vacuum A means of generating

were primarily used on railways where vacuum brakes were used to brake the train, but where there was no vacuum brake on the steam locomotive itself,

usually called anode in Britain, is a type of electrode that forms part of a vacuum tube. It is usually made of sheet metal, connected to a wire which passes

the cryptanalysis of the Lorenz cipher. Colossus used thermionic valves (vacuum tubes) to perform Boolean and counting operations. Colossus is thus regarded

A honeywagon or honeycart is the slang term for a "vacuum truck" for collecting and carrying human excreta. These vehicles may be used to empty the sewage

available: the Accumulator (AC) and Multiplier/Quotient (MQ). It used 1,700 vacuum tubes (triode types: 6J6, 5670, 5687, a few diodes: type 6AL5, 150 pentodes

field. Since the Higgs field vacuum expectation value is nonzero, particles interact with this field all the time even in vacuum. This changes their weak

without any special electrical or air conditioning requirements. It used vacuum tubes, a magnetic drum, and punched paper tape readers and punchers. The

may also be sold with the salted paste removed, wrapped in plastic, and vacuum-packed. From the salt curing process, the salted duck eggs have a briny

secondary stress is said to arise in compound words like vacuum cleaner, where the first syllable of vacuum has primary stress, while the first syllable of cleaner

Hamilton–Jacobi–Einstein equation Theory of everything World crystal Quantum vacuum state False vacuum Why is there anything at all?#Something may exist necessarily

as hysteroscopy and vacuum aspiration. It is as efficient as intracervical block, according to a study on women undergoing vacuum aspiration with lidocaine

Meissner around 1912, based on the Audion (triode) vacuum tube invented by Lee De Forest in 1906. Vacuum tube transmitters were inexpensive and produced

An electron multiplier is a vacuum-tube structure that multiplies incident charges. In a process called secondary emission, a single electron can, when

electric field effects in solid state materials, with the aim of replacing vacuum tubes with a smaller device that consumed less power. The critical experiment

Stark's Vacuum Museum, also known as Stark's Vacuum Cleaner Museum, is a vacuum cleaner museum in Portland, Oregon. It showcases more than 100 vacuums from

the characteristic sound associated with a vacuum tube amplifier (valve amplifier in British English), a vacuum tube-based audio amplifier. At first, the

device produces significant electrical noise. Before the proliferation of vacuum tube amplifiers in the 1920s, carbon microphones were the only practical

A valve audio amplifier (UK) or vacuum tube audio amplifier (US) is a valve amplifier used for sound reinforcement, sound recording and reproduction. Until