|
K-band is the frequency band from 10,900 to 36,000 Mhz, about 1 cm wavelength, employed in radar.
 Research K-band
In telecommunications, K56flex is Lucent and Rockwell's joint 56K modulation protocol that makes Rockwell's K56Plus and Lucent's V.flex2 technologies interoperable
Research K56flex
K56Plus is Rockwell's proprietary protocol for 56000 bps modulation. Merged with Lucent's V.flex to create K56flex. OC-3 In telecommunications, OC-3 is a fibre optic line capable of 155 megabits per second (155,000K).
Research K56Plus
A kaleidoscope is an optical instrument which, by an arrangement of mirrors produces a symmetrical reflection of various transparent substances placed between them. It was invented by Sir David Brewster between 1814 and 1817.
Research Kaleidoscope
Kamptulicon was a substance used for flooring. It was invented in 1843 by Elijah Galloway and was comprised of rubber and cork combined by a masticating machine.
Research Kamptulicon
Kater's pendulum is a complex pendulum designed by Henry Kater to measure the acceleration of free fall. It consists of a metal bar with knife edges attached near the ends and two weights that can slide between the knife edges. The bar is pivoted from each knife edge in turn and the positions of the weights are adjusted so that the period of the pendulum is the same with both pivots. The period is then given by the formula for a simple pendulum, which enables g to be calculated.
Research Kater's pendulum
A katharometer is an instrument for comparing the thermal conductivities of two gases by comparing the rate of loss of heat from two heating coils surrounded by the gases. The instrument can be used to detect the presence of a small amount of an impurity in air and is also used as a detector in gas chromatography.
Research Katharometer
KDE (K Desktop Environment) is a popular graphical user interface for X Windows invented by Matthias Ettrich.
Research KDE
KeeBoo is a computer program for the Windows operating system which allows electronic books to be generated by drag-and-drop of other documents, such as web pages from any web browser, texts, images, movies, or spreadsheets to form a single integrated e-text of the various source files. The e-book can be personalised and enhanced by adding sticky notes with your comments and highlighting important sections. KeeBoo automatically creates chapters, a table of contents, and an index.
Research KeeBoo
Kelvin is a temperature scale in which the absolute zero of temperature (-273 degrees Celsius) is represented by zero degrees Kelvin.
Research Kelvin
A kenotron is a high-voltage thermionic diode rectifier.
Research Kenotron
The Kenwood R-1000 is a classic Japanese made general coverage receiver manufactured between 1979 and 1985 and providing coverage from 200 kHz to 30 Mhz in AM, SSB and CW modes.
Research Kenwood R-1000
The Kenwood R-2000 is a classic Japanese made general coverage receiver manufactured between 1983 and 1992 and providing coverage from 200 kHz to 30 Mhz in AM, SSB, CW and FM modes.
Research Kenwood R-2000
The Kenwood R-5000 is a classic Japanese made general coverage receiver manufactured between 1987 and 1996 and providing coverage from 100 kHz to 30 Mhz in AM, SSB, CW and FM modes.
Research Kenwood R-5000
The Kenwood R-600 is a classic Japanese made budget general coverage receiver manufactured between 1982 and 1985 and providing coverage from 150 kHz to 30 Mhz in AM, SSB and CW modes. It was aimed at the beginner, and as such performance was fairly mediocre.
Research Kenwood R-600
Keratins are fibrous proteins occurring in hair, feathers, hooves, and horns.
Keratins have coiled polypeptide chains that combine to form supercoils of several polypeptides linked by disulphide bonds between adjacent cysteine amino acids. Aggregates of these supercoils form microfibrils, which are embedded in a protein matrix. This produces a strong but elastic structure.
Research Keratin
Keroselene is a substance derived from the distillation of coal-tar. It was discovered in 1861 by Merrill, and used as an anaesthetic.
Research Keroselene
Kerosene is an oil distilled from petroleum, coal or bituminous shale.
Research Kerosene
ketals are organic compounds, similar to acetals, formed by addition of an alcohol to a ketone. If one molecule of ketone reacts with one molecule of alcohol, then a hemiketal is formed. The rings of ketose sugars are hemiketals. Further reaction produces a full ketal.
Research Ketals
Ketoglutaric Acid is a salt or acid produced in the metabolism of proteins or carbohydrates.
Research Ketoglutaric Acid
Ketone is one of a series of organic compounds in which the carbonyl group is united with two monovalent hydrocarbon radicals.
Research Ketone
A killfile is a file that lets you filter Usenet postings to some extent, by excluding messages on certain topics or from certain people.
Research Killfile
In chemistry, kindling temperature is the lowest temperature at which a substance bursts into flame.
Research Kindling temperature
Kinescope is a name mainly used in America for a cathode ray tube used in a television receiver.
Research Kinescope
Kinetic energy is the energy which a body has by reason of its motion.
Research Kinetic Energy
Kinetics is the branch of dynamics dealing with actual motion.
Research Kinetics
The kinetoscope was an apparatus invented by Thomas Edison for the continuous photography of objects in motion. The first series of photographs were of the strong man Sandow, and were reported in New York in 1894. From the invention of the kinetoscope grew the modern film industry. Early presentations involved members of the public inserting money into an automatic kinetoscope which then showed a primitive silent film.
Research Kinetoscope
Kinoplasm is a very active, specialised protoplasm responsible for the formation of mobile cell structures, such as cilia and filaments.
Research Kinoplasm
Kirlian photography is a photographic process that involves the use of electrostatic phenomena associated with the object being photographed. When unexposed film is placed on an electrode, and the object placed on or near the film, the electrode is subjected to high-voltage pulses. The film is then developed, and various kinds of ' halos' or 'auras' are seen to surround the object. These results are real, although Kirlian photography has been linked to 'psychic' phenomena by para- psychologists. The exact processes being observed are not yet well understood, but the photographic displays indicate such factors as stresses in inorganic materials and various conditions in living organisms.
Research Kirlian Photography
A klystron is a thermionic tube suitable for use as a microwave amplifier or oscillator, in which the electron stream is velocity-modulated.
Research Klystron
Knotting is a solution of shellac in methylated spirit used to prevent resing from exuding from knots in woodwork.
Research Knotting
KOI8-R is a non-ISO computer character set popular in Russia. The lower half is American ASCII and the upper half is a Cyrillic character set.
Research KOI8-R
The koniscope was an instrument invented by John Aitken to test the purity of air as regards dust. It consisted essentially of an air-pump and a test tube with glass ends. At one end of the test tube was a passage communicating with the air-pump, and near the other end a stopcock. The tube being pointed towards the sky or any other source of light the stopcock was shut, and a full stroke of the pump made. The inside of the tube was lined with moist blotting paper and dust particles were held on it and a colour effect produced.
Research Koniscope
Krypton, named from the Greek word kryptos, meaning 'hidden', is an odourless, colourless, tasteless, non-toxic, monatomic, and highly stable gaseous element of the noble gases group with the symbol Kr. The concentration of Krypton gas in the atmosphere by volume is 1.1 x 10-4. Traces of krypton are present in minerals and meteorites, but the usual commercial source is the atmosphere, which contains 1.14 parts per 106 by volume. Krypton also is formed by the nuclear fission of uranium triggered by slow neutrons: this source may be expected to become increasingly important because of the growing number of fission-power plants.
Krypton has isotopes of every mass number from 74 through 95; six, with mass numbers 78, 80, 82, 83, 84, and 86, are stable. After it has been stored a few days, krypton obtained by nuclear fission contains only one radioactive isotope, krypton-85, which has a half-life of about 10 years, because all the other radioactive isotopes have half-lives of three hours or less. Because its boiling point is about 30 degrees C higher than those of the major constituents of air,
krypton is readily separated from liquid air by fractional distillation; it accumulates along with xenon in the least volatile portion. These two gases are further purified by adsorption onto silica gel, redistillation, and passage over hot titanium metal, which removes all impurities except other noble gases.
Krypton gas liquefies at -152.30 degrees C and freezes 4 degrees C lower. When a current of electricity is passed through a glass tube containing krypton at low pressure, a bluish white light is emitted. The wavelength of an orange-red component of light emitted by stable
krypton-86, because of its extreme sharpness, served as the international standard for the metre from 1960 to 1983. (One metre equals 1,650,763.73 times the wavelength of this line).
Krypton gas is principally shipped and used in gaseous form for excimer lasers, light bulbs, window insulation and Research and Development laboratory research.
Research Krypton
|
Abbreviations
SciTech
