thermionic cathode. From Wordnet, Princeton University.
His early work was concerned with thermionic emission and adsorbed layers on tungsten. From Wordnik.com. [Walter H. Brattain - Biography] Reference
It was a wirin 'diagram, and sair ancient, too, for there were symbols for thermionic valves-vacuum tubes-in it. From Wordnik.com. [Spock Must Die]
It is based on the 1898 Pidgeon electrostatic machine which includes an inductance circuit, a capacitance circuit, and a thermionic rectification valve. From Wordnik.com. [Archive 2007-05-01] Reference
Dunyan counted on the equipment of the mess which consisted of artificial carbohydrates to produce the desired thermionic effect in conjunction with the high velocity neutrons. From Wordnik.com. [Enemy in the Dark]
The revolution in technique has come about not from any increase in the sensitivity of galvanometers and electrometers but from the use of the thermionic valve to amplify potential changes. From Wordnik.com. [Edgar Adrian - Nobel Lecture] Reference
Growth happens because we can now have a wireless conisting of a little electronic circuit board in a plastic box, instead of a huge great thing of thermionic valves in a handmade walnut cabinet. From Wordnik.com. [Fisking Thanks] Reference
Rectifier Circuits of Alternating Current half-wave rectification full wave rectification opposite-contact connection full-wave rectification - bridge connection full-wave rectification - thermionic rectifier in double-way connection. From Wordnik.com. [6. Rectifier Circuits] Reference
He discovered monomolecular films with specific molecular orientation at surfaces and promoted understanding of plasmas, heat transfer, and thermionic phenomena, and invented a high-vacuum electron tube and gas-filled incandescent lamp. From Wordnik.com. [Langmuir, Irving] Reference
In order to obtain a more sensitive detection of nerve impulses, he used the cathode ray tube, the capillary electrometer and amplification of the electrical impulses by means of thermionic valves, and was thus able to amplify them 5,000 times. From Wordnik.com. [Edgar Adrian - Biography] Reference
A similar phenomenon, known as "secondary emission", occurs in thermionic valves (vacuum tubes) where electrons of sufficient energy, when hitting a surface (or passing through some medium), induce the emission of secondary electrons from the anode. From Wordnik.com. [Up, Up and Away! Helium Balloon Telescope Explores the Sun | Universe Today] Reference
Before 'solid state devices' were introduced, people used 'thermionic devices' in electronics. From Wordnik.com. [Yahoo! Answers: Latest Questions] Reference
There are still distributors of thermionic valves to be found, though they are few and far between. From Wordnik.com. [CR4 - Recent Forum Threads and Blog Entries] Reference
Depending on temperature, emission may be dominated by photoemission (not shown here), PETE or thermionic emission. From Wordnik.com. [Naturejobs - All Jobs] Reference
The device is based on thermionic emission of photoexcited electrons from a semiconductor cathode at high temperature. From Wordnik.com. [Naturejobs - All Jobs] Reference
Think of the oldest computers which filled up rooms and hardly had any programming power -- they were made using thermionic devices. From Wordnik.com. [Yahoo! Answers: Latest Questions] Reference
Purely thermionic emission from this sample in the absence of illumination is considerably smaller but occurs in the same energy range. From Wordnik.com. [Naturejobs - All Jobs] Reference
Called "photon enhanced thermionic emission," or PETE, the process uses cesium to more than double existing systems 'efficiency levels. From Wordnik.com. [Blah, Blah! Technology] Reference
The other important element was the switch from thermionic valves (vacuum tubes) to transistors, which offered faster switching speeds. From Wordnik.com. [Latest Articles] Reference
For their own purposes the physicists promptly constructed thermionic-tube equipment capable of counting electrical impulses at the rate of 100,000 a second. From Wordnik.com. [As We May Think] Reference
Photoexcitation increases the conduction-band population, leading to larger thermionic currents and enabling the device to harvest both photon and heat energy. From Wordnik.com. [Naturejobs - All Jobs] Reference
Called "photon enhanced thermionic emission," or PETE, the process promises to surpass the efficiency of existing photovoltaic and thermal conversion technologies. From Wordnik.com. [National Business News - Local Business News | bizjournals] Reference
The device they've created, dubbed the "photon enhanced thermionic emission," or PETE, doesn't even hit peak efficiency until it reaches well over 200 degrees Celsius. From Wordnik.com. [Gizmodo] Reference
The thermionic temperature at which the emitter will give off electrons (without sputtering emitter material) into the trapped gas (inside the lamp) is around 950° C. From Wordnik.com. Reference
The process, called "photon enhanced thermionic emission," or PETE, could reduce the costs of solar energy production enough for it to compete with oil as an energy source. From Wordnik.com. [ScienceBlogs Channel : Life Science] Reference
He is exploiting "thermionic emission", the propensity of some materials to spit out electrons when heated, and it turns out that ultrathin diamond is better at this than most. From Wordnik.com. [New Scientist - Online News] Reference
Here we present a new concept for solar electricity generation, photon-enhanced thermionic emission, which combines quantum and thermal mechanisms into a single physical process. From Wordnik.com. [Naturejobs - All Jobs] Reference
The technology -- dubbed "photon enhanced thermionic emission," or PETE, for short -- would work best in solar concentrators like parabolic dishes that can reach 800 degrees Celsius. From Wordnik.com. [Scientific American] Reference
If necessary, it could be made extremely fast by substituting thermionic-tube switching for mechanical switching, so that the full selection could be made in one one-hundredth of a second. From Wordnik.com. [As We May Think] Reference
The classical example of thermionic emission is the transmission of electrons from a hot metal cathode (negative terminal) to an anode (positive terminal) in a vacuum which is known as the Edison effect. From Wordnik.com. [TheZoo] Reference
Technical difficulties of all sorts have been ignored, certainly, but also ignored are means as yet unknown which may come any day to accelerate technical progress as violently as did the advent of the thermionic tube. From Wordnik.com. [As We May Think] Reference
"for his work on the thermionic phenomenon and especially for the discovery of the law named after him". From Wordnik.com. [Physics 1928] Reference
An example of a thermionic device is a valve - they were pretty much cathode ray tubes, with a grill in the middle which could easily control the flow of electrons across the tube. From Wordnik.com. [Yahoo! Answers: Latest Questions] Reference
1913, working at thermionic emission, photoelectric action, and the gyromagnetic effect. From Wordnik.com. [Owen Willans Richardson - Biography] Reference
(say) ˜intermediate frequency amplifier™ while remaining) neutral as to the exact circuit and whether the amplification is carried out by a thermionic valve or by a transistor. From Wordnik.com. [The Identity Theory of Mind] Reference
Photon enhanced thermionic emission could double. From Wordnik.com. [Joystiq] Reference
All thermionic valves. From Wordnik.com. [The Mystery of the Lost Computer « Official Harry Harrison News Blog] Reference
Remember the Rotating thermionic convertor?. From Wordnik.com. [ZPEnergy.com] Reference
Re: Remember the Rotating thermionic convertor?. From Wordnik.com. [ZPEnergy.com] Reference
"First," he said, "do you know how a thermionic valve works?". From Wordnik.com. [In Spite of Their Declaration of Bombs] Reference
LearnThatWord and the Open Dictionary of English are programs by LearnThat Foundation, a 501(c)3 nonprofit.
Questions? Feedback? We want to hear from you!
Email us
or click here for instant support.
Copyright © 2005 and after - LearnThat Foundation. Patents pending.