单词 | plasma |
释义 | plasman. 1. A green variety of chalcedony, valued as a semi-precious stone, and formerly used for carving into intaglios. Also more fully †plasma emerald. ΘΚΠ society > occupation and work > materials > raw material > gem or precious stone > rock crystal > [noun] > green quartz plasma1577 plasm1747 1577 J. Frampton tr. N. Monardes Three Bookes f. 19 The finest of them are like vnto Plasma of Esmeraldes [Sp. plasma de esmeraldas], which is likened to greene with a Milkishe couller. ?1733 C. Cock Catal. Signor Sterbini's Curious Coll. 3 A jasper Snuff box set in Silver... Ditto of the plasma Emerald, unset. 1761 A. Langford Catal. Coll. Antique Gems Signor de Medina. 9 A woman's head in plasma, and a Bacchante in onyx. 1770 G. von Engeström & E. M. da Costa tr. A. F. Cronstedt Ess. Syst. Mineral. 81 (note) The Plasma, or mother of the emerald of authors, is a fine pellucid true quartz, of a green or emerald colour. 1839 A. Ure Dict. Arts 208 Under it [sc. calcedony] may be grouped..chrysoprase, plasma,..and sard. 1861 C. W. King Antique Gems (1866) 14 Plasma..sometimes written Prasma..is merely Calcedony coloured green by some metallic oxide, probably copper or nickel. 1900 Brit. Mus. Ret. 64 Green plasma scaraboid, with intaglio of a warrior. 1962 C. Frondel Dana's Syst. Mineral. (ed. 7) III. 218 Plasma is virtually opaque with a conchoidal to smooth fracture. a. A pot; something which has been shaped or moulded. Also figurative. Obsolete. ΘΚΠ the world > food and drink > food > food manufacture and preparation > equipment for food preparation > cooking vessel or pot > [noun] pot?c1225 flesh-kit1575 plasma1616 vessel1719 pot-au-feu1792 cookpot1835 cooker1849 hook-pot1867 canaree1895 1616 T. Granger Syntagma Grammaticum Ep. Ded. sig. B I speake not of the immortall soule, but of her plasma, or vessell. b. Form, mould, shape. Obsolete. ΘΚΠ the world > space > shape > [noun] hue971 shapec1050 form1297 casta1300 entailc1320 fashionc1320 featurec1325 tailc1325 suitc1330 figuringc1385 figure1393 makinga1398 fasurec1400 facea1402 makec1425 proportionc1425 figuration?a1475 protracture1551 physiognomy1567 set1567 portraiturea1578 imagerya1592 model1597 plasmature1610 figurature1642 scheme1655 morphosis1675 turn1675 plasma1712 mould1725 format1936 1712 tr. H. More Scholia Antidote Atheism 145 in H. More Coll. Philos. Writings (ed. 4) They..act upon the Matter..and form it into this or that Plasma or Fashion. 1846 W. S. Landor Imaginary Conversat. in Wks. I. 83/2 A great portion of his compositions is not poetry, but only the plasma or matrix of poetry. 3. a. Physiology. More fully blood plasma: the clear, protein-rich liquid in which the cells of the blood are suspended. Also: the liquid component of lymph. Cf. serum n. a.Frequently attributive with reference to (the concentration of) substances dissolved in the blood, as plasma protein, etc.See also muscle-plasma n. ΘΚΠ the world > life > the body > secretory organs > secretion > plasma > [noun] blood plasma1836 plasma1836 plasm1876 the world > life > the body > secretory organs > secretion > plasma > [adjective] plasmatic1864 plasma1891 1836 Amer. Jrnl. Med. Sci. 18 446 (note) By the process of coagulation, the plasma is separated into two portions, serum and fibrin or plastic lymph. 1876 J. Van Duyn & E. C. Seguin tr. E. L. Wagner Man. Gen. Pathol. 230 Normal lymph consists of a colorless plasma and lymph-corpuscles. 1891 W. D. Halliburton Text-bk. Chem. Physiol. xv. 238 The globulin pre-existent in the blood plasma..may be termed plasma-globulin. 1927 M. Bodansky Introd. Physiol. Chem. vii. 168 Reduction of the plasma proteins by plasmapharesis..results in a condition of shock. 1969 E. Kelemen Physiopathol. & Therapy Human Blood Dis. i. 105 About 80–90% of plasma proteins, i.e. fibrinogen, albumin, and certain globulins, including most of the plasma coagulation factors, are formed in the liver. 1988 Holiday Which? May 124/2 There's a doctor available to administer the plasma. 2001 P. Caldwell Sleep Really Well (2003) xi. 228 Histamine..opens up tiny blood vessels to let more blood flow to an area that needs it, and also lets these tiny vessels leak plasma..into surrounding cells. b. The liquid component of other body fluids or secretions, esp. of milk or semen. ΚΠ 1852 Lancet 3 July 11/1 In vaginal leucorrhœa, the plasma is opaque, and contains myriads of epithelial particles. 1898 Lancet 13 Aug. 453/1 Caseinogen did not exist in solution in the milk plasma. 1912 W. Tibbles Foods ix. 245 The potash, soda, and chlorine, in the total milk are the same as in the milk plasma. 1936 W. L. Davies Chem. Milk xii. 248 The clumps contain milk plasma, and the densest clumps about 50 per cent. of fat, whereas the plasma around the clumps is relatively fat-free. 1948 Lancet 20 Mar. 446/1 Fructose exists normally in the seminal plasma of various mammals. 1973 Proc. National Acad. Sci. U.S.A. 70 1976/2 The clear ‘milk-plasma’ zone between the lipid and precipitated casein layers was removed and centrifuged. 2003 Gulf News (Nexis) 5 July The efforts are to produce a vaccine from camel's milk made of the milk's plasma. 2005 Theriogenology 63 1667 This study examined proteolytic enzymes and serine proteinase inhibitors in turkey seminal plasma. ΘΚΠ the world > health and disease > healing > medicines or physic > medical preparations of specific origin > biological product > [noun] > glycerine preparations plasma1858 glycerole1861 glycerite1875 1858 D. F. Schacht in Pharm. Jrnl. & Trans. 17 401 As the compound word amylo-glycerine..would be from its length somewhat inconvenient, I have adopted the term ‘Plasma,’ and by this name the few medical friends to who I have shown the article are prescribing it. 1865 E. Parrish Treat. Pharmacy (ed. 3) vii. 784 Under the name of glyceroles, glycamils and plasmata, some unofficial preparations of the consistence of pomades have been introduced into medicine within a few years. They are made by heating starch and glycerine together; the glycerine may be previously medicated..or medicinal substances in powder may be incorporated mechanically with the starch. 1874 J. B. Biddle Materia Medica (ed. 6) 392 The name Plasma is applied to a compound of glycerin..and starch.., mixed at 240° F.; this is used as a substitute for ointments, and is a good excipient for pills. 1890 Cent. Dict. Plasma.., same as glycerite of starch. 5. Biology †A material in or from which cells are formed (obsolete); protoplasm; cytoplasm. Now rare except in plasma membrane n. at Compounds 3 and plasma cell n. ΘΚΠ the world > life > biology > substance > cell > cell substance > [noun] > protoplasm or cytoplasm biogen1848 protoplasm1848 protoplast1851 matrix1854 cytoplasm1857 plasma1863 bioplasm1869 plasmogen1888 morphoplasm1893 periplasm1925 1856 R. Owen in Jrnl. Soc. Arts 19 Dec. 65/1 All the parts of animal bodies are, at their, beginning, in a state of fluid. In this plasma, or formative fluid, there are numerous points..of..assimilative force.] 1863 Lancet 17 Jan. 55/1 A homogeneous plasma first exists, in which spaces (vacuoles) are formed, and these contain the cell wall, contents, and nucleus. 1864 Webster's Amer. Dict. Eng. Lang. Plasma..2. (Physiol.) The viscous material of a cell from which the new developments take place. 1867 J. Hogg Microscope (ed. 6) i. iii. 223 For certain delicate organisms, as the desmidiaceæ and diatomaceæ, whose plasma may be affected by too dense a medium. 1876 E. R. Lankester tr. E. Haeckel Hist. Creation I. viii. 185 The entire body..consists..of shapeless plasma, or protoplasm. 1904 J. McCabe tr. E. Haeckel Wonders of Life 215 The simple formation of individuals in this primitive living matter is merely a question of the cleavage of plasma globules of a certain size. 1934 Amer. Naturalist 68 14 It was shown that no cytoplasmic heredity comes into play, but only a differential action of different plasmata as substratum upon the action of the genes in controlling the differentiation of definite characters. 1982 Science 1 Oct. 47/3 Only about 10 percent of the fragments were living (that is, contained plasma stained by rose Bengal). 6. Physics. An ionized gas containing free electrons and positive ions, formed usually at very high temperatures (as in stars and in nuclear fusion experiments) or at low pressures (as in the upper atmosphere and in fluorescent lamps); esp. such a gas which is electrically neutral and exhibits certain phenomena due to the collective interaction of charges. Also: an analogous collection of charged particles in which one or both kinds are mobile, as the conduction electrons in a metal or the ions in a salt solution. ΘΚΠ the world > matter > physics > atomic physics > ion > plasma or ionized gas > [noun] plasma1928 magnetoplasma1958 the world > matter > chemistry > physical chemistry > gaseous phase > [noun] > gas > properties > a gas which is electrically neutral plasma1928 1928 I. Langmuir in Proc. National Acad. Sci. U.S.A. 14 628 It seemed that these oscillations must be regarded as compressional electric waves somewhat analogous to sound waves. Except near the electrodes..the ionized gas contains ions and electrons in about equal numbers so that the resultant space charge is very small. We shall use the name plasma to describe this region containing balanced charges of ions and electrons. 1930 Physical Rev. 37 1467 The plasma used in this investigation was the positive column of a mercury arc. 1958 Engineering 31 Jan. 134/2 The stable plasma reaches the high temperatures, of the order of 5 million deg. K., necessary for producing thermonuclear reactions. 1969 C. Steele & B. Vural Wave Interactions in Solid State Plasmas i. 4 In a metal like copper, the free electrons comprising the plasma are electrically compensated by the positively ionized copper atoms. 1971 E. Nasser Fund. Gaseous Ionization & Plasma Electronics xiv. 427 Liquid plasmas exist in salt solutions where the positive and negative ions move separately. 1976 T. Beer Aerospace Environment i. 16 The solar wind is a plasma of hydrogen ions (protons) and electrons travelling at speeds that range from 300 km s–1 to 1000 km s–1, depending on solar activity. 2001 South China Morning Post (Hong Kong) (Nexis) 12 Mar. 1 For up to 10 hours a day, he plays a game called Quake III..blowing holes in terrorists, watching their crimson innards splatter as he reloads his plasma gun. 7. Soil Science. The colloidal or relatively soluble material between grains of a soil. ΘΚΠ the world > the earth > structure of the earth > constituent materials > earth or soil > [noun] > soil substances fatness1577 soil colloid1915 plasma1938 1938 W. L. Kubiena Micropedology iii. iv. ii. 186 We speak of a channel fabric if the ground mass of a soil body showing skeleton and plasma in a definite arrangement is transversed by numerous tubes and veins containing plasma substances. 1958 I. W. Cornwall Soils for Archaeologist xvii. 190 Intergranular spaces and conducting channels may be filled, or partly filled, with colloids and precipitates, conveyed and deposited..by percolating moisture. This is the soil-plasma, which constitutes in part the cement between adjacent grains and in part mere filling of available voids. 1976 F. M. Courtney & S. T. Trudgill Soil ii. 17/2 In thin sections under a microscope the soil plasma can be recognized... It is an amorphous combination of humus, clays and chemical compounds (e.g. iron oxide), and is produced by the secondary weathering processes..and by the incorporation of organic matter... The presence of mineral matter in the plasma distinguishes it from the overlying purely organic horizons. Compounds C1. (In sense 5.) plasma body n. ΚΠ 1869 Q. Jrnl. Microsc. Sci. 9 31 Naked Plasma-bodies without nuclei. 1982 Science 1 Oct. 49/1 Although the xenophyophore sediment tube is an order of magnitude larger in diameter than the unattached plasma body it encloses, it is nevertheless considered to be part of the organism. C2. (In sense 6.) plasma cloud n. ΘΚΠ the world > the earth > weather and the atmosphere > [noun] > cloud or layer of plasma plasma cloud1960 plasma sheet1966 1960 Aeroplane 98 610/1 It appears that plasma clouds emitted from the Sun run up against the Earth's magnetic field, causing it to release previously trapped particles into the atmosphere. 1969 Monthly Notices Royal Astron. Soc. 145 328 In the Ryle-Longair model, plasma clouds formed by a strong explosion within a galaxy expand..until their dimensions exceed galactic dimensions, at which time they are ejected from the parent galaxy and henceforth evolve independently. 1992 S. P. Maran Astron. & Astrophysics Encycl. 334/1 The interaction of cosmic rays with stronger than ambient magnetic fields that are transported to the outer solar system by these so-called plasma clouds. C3. plasma arc n. a very hot plasma jet used in plasma torches, produced by passing a noble gas through a nozzle that is one electrode of an electric arc. ΘΚΠ society > occupation and work > equipment > cutting tool > other types of cutting equipment > [noun] > gas or plasma cutters oxygen lance1925 plasma arc1958 plasma torch1959 thermic lance1970 1958 Iron Age 4 Dec. 136/1 Thanks to the development of the new plasma arc torch, a brand new method for fabricating shapes and applying ultra-high-temperature coatings is now a reality. 1973 Materials & Technol. VI. i. 60 A number of unconventional methods of cutting wood have been examined, largely with the object of reducing waste. These include the use of the plasma arc, which produces very high temperatures with a nozzle of very small diameter. 1990 New Scientist 30 June 44/1 Scientists in Melbourne have developed a compact plasma arc furnace which can destroy long-lived toxic wastes efficiently. plasma-corpuscle n. Physiology rare = plasma cell n. ΚΠ 1907 N.E.D. at Plasma Plasma-corpuscle. plasma current n. †(a) Physiology = plasma layer n. (obsolete rare); (b) Physics an electric current flowing in a plasma (sense 6). ΚΠ 1890 J. S. Billings National Med. Dict. II. 350/1 Plasma layer, or current, or zone. 1960 Science 22 Jan. 209/3 If the walls of the vessel..are conducting, then a displacement of the plasma current toward the walls will induce Foucault currents in them, and these currents will tend to repel the plasma current. 1991 SIAM Rev. 33 148/1 The plasma current is obtained by induction, with the plasma appearing as the secondary of a transformer and the poloidal field coils constituting the primary. plasma diagnostics n. Physics (with singular agreement) the determination of the physical characteristics of plasmas by experimental methods that do not significantly alter them. ΘΚΠ the world > matter > physics > atomic physics > ion > plasma or ionized gas > [noun] > study of plasma physics1958 plasma dynamics1960 plasma diagnostics1961 diagnostic1963 1961 IRE Trans. Antennas & Propagation 9 317/1 (heading) The potential utility of scanning microwave beams in plasma diagnostics. 1999 Proc. National Acad. Sci. U.S.A. 96 5366/1 Plasma diagnostics show that regions emitting radiation of highly ionized items..are much hotter. plasma engine n. a form of rocket engine in which plasma is produced and then ejected at high speed. ΘΚΠ society > occupation and work > equipment > machine > machines which impart power > engine > internal-combustion engine > [noun] > jet > types of jet turbine1878 ramjet1945 pulse jet1946 plasma engine1958 reaction jet1959 fan-jet1963 1958 S.A.E. Jrnl. Apr. 93/2 Another phase of our investigations..is the development of a plasma engine, in which small amounts of plasma are ejected at extremely high velocities. 1974 R. Hawkey & R. Bingham Wild Card xv. 131 The propulsion pack was okay for the demonstration... We plan to replace it with a small plasma engine. 1996 J. H. Kessler et al. Distinguished Afr. Amer. Scientists 20th Cent. 37 One of his first projects in graduate school was to experiment with a new type of rocket engine called a plasma engine. plasma expander n. Medicine a solution used in cases of blood loss to increase the volume of blood plasma during transfusion. ΚΠ 1952 S. Afr. Med. Jrnl. 26 546 (heading) Dextran; a valuable plasma volume expander.] 1952 Ann. N.Y. Acad. Sci. 55 496 (title) Various plasma expanders in animals. 2003 Anti-Infectives Week (Nexis) 25 Aug. 9 Agents recently described to induce an osmotic nephrosis include intravenous immunoglobulin and the plasma expander hydroxyethyl starch. plasma frequency n. Physics the natural resonant frequency of a plasma oscillation, equal to the minimum frequency of electromagnetic waves that can travel through the plasma without attenuation (the value is approximately 8920√n Hz, where n is the number of free electrons per cubic centimetre). ΘΚΠ the world > matter > physics > atomic physics > ion > plasma or ionized gas > [noun] > oscillation of electrons in > frequency of plasma frequency1949 1929 Physical Rev. 33 198 Thus the lower frequency limit for long waves coincides with the plasma-electron frequency.] 1949 Physical Rev. 75 1852/1 For a typical density of 1012 electrons per cm3, the plasma frequency is about 1010 c.p.s. 1964 D. B. Newman Space Vehicle Electronics iv. 225 Above the plasma frequency the plasma has dielectric properties... Well below the plasma frequency, the plasma acts like a conductor. 1980 Sci. Amer. Sept. 186/2 If the frequency of the radio signal is higher than the plasma frequency, the signal continues to travel through the ion layer. plasma jet n. a high-speed stream of plasma ejected from a plasma engine, a plasma torch, a star, etc. ΘΚΠ the world > matter > physics > atomic physics > ion > plasma or ionized gas > [noun] > jet of plasma jet1957 1957 G. M. Giannini Plasma Jet & Applic. (U.S.A.F. Office Scientific Res. Techn. Note 57–520) 22 The ‘plasma jet’ can be used for many of the purposes described... The jet is very hot, highly ionized, has a high velocity. 1960 Aeroplane 98 610/2 Because of the low thrust produced, the plasmajet cannot be employed for rocket-launching from Earth. It must be carried into orbit by a more powerful chemical rocket and started in the weightless environment of space. 1972 D. G. Shepherd Aerospace Propulsion viii. 202 The arc jet or plasma jet utilizes the very high temperatures in arcs to heat the propellant. 1988 T. Ferris Coming of Age in Milky Way (1989) i. ix. 175 A blue-white plasma jet..has been spat from its core with the velocity of a bolt of lightning. plasma layer n. [after German Plasmaschicht (1868 in the passage translated in quot. 1876)] Physiology the layer of blood close to the walls of a vessel, which contains relatively few red blood cells. ΚΠ 1876 J. Van Duyn & E. C. Seguin tr. E. L. Wagner Man. Gen. Pathol. iii. i. 178 The plasma-layer..disappears in the smaller arteries and veins. 1963 Science 6 Dec. 1319/2 The plasma layer adjacent to the capillary wall is essentially stationary and the highest velocity..is in the centre of the capillary. 1977 Philos. Trans. (Royal Soc.) B. 279 438 A cell-free plasma layer developed at the tube wall downstream of the reattachment point. plasma membrane n. [after German Plasmahaut (1892 in the passage translated in quot. 1893)] Biology a semipermeable lipid bilayer with incorporated proteins which forms the external boundary of the cytoplasm of a cell (the cell membrane), or encloses a vacuole within it, and regulates the passage of molecules in and out of the cytoplasm. ΘΚΠ the world > life > biology > substance > cell > parts of cell > [noun] > wall or membranes septum1720 cell wall1840 valve1852 periplast1853 stroma1872 ghost1879 endoplasmic reticulum1883 plasma membrane1893 plasmalemma1923 unit membrane1958 purple membrane1968 1893 J. E. Humphrey tr. A. Zimmermann Bot. Microtechnique 239 Many solutions cause the complete killing of the protoplasm and its inclusions, with the exception of the inner plasma-membrane bordering on the cell-sap, which is not changed in its osmotic relations, so that it still completely excludes the cell-sap. 1900 Ann. Bot. 14 352 The entire structure, antheridium, tube, and oogonium, have in reality become for a time a single cell bounded by a single continuous plasma-membrane. 1948 New Biol. 5 40 The plasma membrane is highly permeable to substances which are soluble in fats and in fat solvents. 1965 P. Bell & D. Coombe tr. Strasburger's Textbk. Bot. (new ed.) 13 The inner plasma membrane surrounding the vacuole is known as the tonoplast, and that adjacent to the cell wall as the plasmalemma. 1991 Amer. Scientist Mar. 163/1 This phosphorylated protein then in some way mediates the opening of channels in the plasma membrane for chloride ions or other anions. plasma oscillation n. Physics a collective oscillation of the charged particles in a plasma. ΘΚΠ the world > matter > physics > atomic physics > ion > plasma or ionized gas > [noun] > oscillation of electrons in plasma oscillation1928 1928 I. Langmuir in Proc. National Acad. Sci. U.S.A. 14 629 Plasma Oscillations.—If..we change the concentration of electrons by some transient external means, the resulting electric fields act..to equalize the concentration, but the potential energy of these fields is converted into kinetic energy of the electrons so that oscillations occur, and electric waves may result. 1970 W. A. Harrison Solid State Theory iii. 288 Physically these plasma oscillations correspond to soundlike compression waves in the electron gas. 1992 S. P. Maran Astron. & Astrophysics Encycl. 631/2 The fastest CMEs do show a good (but not perfect) correlation with reported metric type II bursts, the slow-drift bursts attributed to coronal plasma oscillations at an expanding shock front. plasma physics n. the branch of physics that deals with plasmas. ΘΚΠ the world > matter > physics > atomic physics > ion > plasma or ionized gas > [noun] > study of plasma physics1958 plasma dynamics1960 plasma diagnostics1961 diagnostic1963 1958 C. C. Adams et al. Space Flight 345 Some scientists think that controlled fusion may be with us in 20 years or so, and if so we may completely bypass fission... Work in plasma physics will have to be carefully watched, and it is through research in this area that eventual success is expected. 1963 Wall St. Jrnl. 22 Jan. Kirtland researchers are delving into plasma physics—the study of partially ionized gases—to determine to what extent high-level nuclear blasts are likely to disrupt vital communications. 1995 New Scientist 14 Oct. 53/2 The so-called pinch effect, well known from plasma physics, may cause some constrictions in lightning strokes. plasma physicist n. ΘΚΠ the world > matter > physics > atomic physics > ion > plasma or ionized gas > [noun] > study of > one versed in plasma physicist1968 1968 New Scientist 24 Oct. 186 To bring about nuclear fusion..plasma with a density of 1014 nuclei per cu. cm. must be held together for about one second. To bring this about is the dream of plasma physicists. 1976 T. Beer Aerospace Environment i. 2 The plasma physicist can use the Earth's upper atmosphere as a gigantic laboratory to study the behaviour of a large-scale plasma being acted upon by the Earth's magnetic field. 2000 New Scientist 28 Oct. 26/2 His goal was to understand how shock waves behave in ionised gases, a topic of real interest to plasma physicists. plasma probe n. a device that is inserted or immersed in an ionized gas to investigate its physical properties. ΘΚΠ the world > matter > physics > atomic physics > ion > plasma or ionized gas > [noun] > study of > instrument Langmuir probe1931 plasma probe1961 1961 Flight 79 462/2 Valuable information had been transmitted from the rubidium vapour magnetometer, two fluxgate magnetometers and the plasma probe. 1977 Sci. Amer. Mar. 39/3 The first data available from the Ames Research Centre's plasma probe on Pioneer 10 as it traversed interplanetary space were the hourly values of the speed of the [solar] wind. 1995 N.Y. Times (Nexis) 2 Sept. i. 9/5 Plasma probes successfully flew on seven NASA Earth satellites, two deep-space probes and four planetary missions. plasma propulsion n. propulsion of a vehicle by means of a plasma engine. ΘΚΠ society > travel > air or space travel > a means of conveyance through the air > aeroplane > parts of aircraft > means of propulsion > [noun] > aircraft engine > jet engine > propulsion by plasma engine plasma propulsion1958 1958 C. C. Adams et al. Space Flight 54 A new Astronautics Research Laboratory with propulsion, astrophysical, and materials sections to study very high-energy fuels, including plasma propulsion systems. 2004 Australian (Nexis) 3 Feb. 33 For deep space exploration, like going to Mars, you need to use plasma propulsion because it is a lot more fuel efficient and you can go a lot faster. plasma sheath n. a thin, electrically charged region formed adjacent to a surface in an ionized gas. ΘΚΠ the world > matter > chemistry > physical chemistry > gaseous phase > [noun] > gas > properties > a gas which is electrically neutral > plasma sheath plasma sheath1961 1961 Aeroplane 100 462/2 During hypersonic flight on the return from orbit, an ionized ‘plasma sheath’ will envelop the glider, impeding the reception and transmission of radio signals. 1969 M. A. Kasha Ionosphere iii. 48 A spacecraft is generally surrounded by some form of plasma sheath. This means that it is very difficult to measure..the electrical potential of the space plasma. plasma substitute n. Medicine a solution used as a substitute for blood plasma in transfusions; a plasma expander. ΚΠ 1943 Science 9 Apr. 321/1 These difficulties are being overcome, very satisfactorily, but empirically, in the war production of plasma substitutes and hemostatic agents. 2000 P. Woodrow Intensive Care Nursing xxxi. 350 Fluid replacement with whole blood and plasma substitutes is likely. plasma tail n. Astronomy a tail of plasma associated with a comet or planetary body. ΚΠ 1971 Jrnl. Geophysical Res. 76 6807/2 A plasma tail may be formed by the tendency of plasma associated with the storm-distorted duskside plasmasphere bulge to corotate with the earth during a period of quieting magnetic activity. 1972 Science 9 Feb. 566 Comet 1970 II..became a spectacular object visible to the naked eye..when it displayed a straight narrow plasma tail and a huge moderately curved dust tail. 2001 N.Y. Times (Nexis) 4 Feb. 9 NASA's image spacecraft, the first to enjoy a global view of the magnetosphere, has spotted a curious plasma tail pointing from Earth toward the Sun. plasma television n. = plasma TV n. ΚΠ 1995 Dallas Morning News 25 Aug. g5/2 Because tubes are not necessary on plasma televisions, the sets will be..really thin. 2002 Daily Tel. 29 Jan. 24/2 Sales of beer and wine are on the up, as are sales of DVDs and jazzy new widescreen plasma televisions to watch them on. plasma torch n. a device that produces a very hot plasma jet for use in cutting solids or coating them with refractory material. ΘΚΠ society > occupation and work > equipment > cutting tool > other types of cutting equipment > [noun] > gas or plasma cutters oxygen lance1925 plasma arc1958 plasma torch1959 thermic lance1970 1959 Welding Engineer Feb. 50/2 Two 600-amp units power a 50-kw plasma torch, and voltage requirements are being set by the gas being used. 1968 Observer 22 Dec. 4/5 The plasma torch, another torch device in industrial use, can virtually disintegrate material at a temperature of 36,000 degrees C. 1986 Railway Gaz. Internat. May 22/1 The pressing and punching machines which are used for most of our metal cutting will be superseded by plasma torches. plasma TV n. a television set with a plasma screen, usually larger and much thinner than a conventional set, and often designed to be hung on a wall. ΚΠ 1983 Long Message answering Questions on REMs/RADs/RBEs & Xrays & Crts in net.physics (Usenet newsgroup) 7 Feb. We found for several of the Plasma TV terminals as well as Lisp machine terminals, both in BW and WB modes, no significant radiation above (approximately) .05 mrem/hr. 1993 N.Y. Times (Nexis) 24 Oct. iii. 9/4 The company is able to come to market first with a plasma TV because it chose a technology based on alternating-current electricity. 2003 What Home Cinema Jan. 12/1 Some manufacturers are now introducing plasma TVs that more closely resemble CRT sets..in terms of their features and available screen sizes. plasma wave n. Physics a wave in a plasma (e.g. an Alfvén wave) involving the oscillation of its charged particles and giving rise to a varying electromagnetic field. ΚΠ 1949 Physical Rev. 75 1870/1 The plasma wave provides a means of intercepting this stream of energy before it is degraded. 1989 Y. Eliezer & S. Eliezer Fourth State of Matter iv. 140 The magnetosphere..contains a variety of plasma waves which cover a wide range of frequencies. 1997 Edupage (online newsletter) 6 July This so-called ‘plasma-wave’ technology could boost the speeds of microprocessors well into the gigahertz range. ΚΠ 1890 J. S. Billings National Med. Dict. II. 350/1 Plasma layer, or current, or zone. C4. attributive. Designating a flat display screen which uses an array of cells containing an inert gas such as neon which emits ultraviolet radiation when ionized to form a plasma, causing visible light of an appropriate colour to be emitted separately for each cell of the screen, according to the image being displayed. Esp. in plasma display, plasma screen. ΚΠ 1966 D. L. Bitzer & H. G. Slottow in Proc. AFIPS Conf. 29 541/1 The Plasma Display is a new device that, in contrast to the cathode ray tube, retains its own images and responds directly to the digital signals from the computer. 1978 SIAM Rev. 20 434 The coefficients generated..were used on the plato computer to represent various orbits on a plasma screen. 1993 Sci. Amer. Mar. 41 The three technologies that have achieved some market acceptance—plasma panels, electroluminescent displays and liquid-crystal displays—all fall short in one or another of these respects. 2000 Daily Tel. 16 Mar. (Connected section) 10/3 Crowding a large group of students around a 15in PC monitor or even a large-screen TV is not easy, but flat-screen plasma displays provide plenty of viewing space. This entry has been updated (OED Third Edition, June 2006; most recently modified version published online June 2022). < n.1577 |
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