| 释义 |
compression
com·pres·sion C0536800 (kəm-prĕsh′ən)n.1. a. The act or process of compressing.b. The state of being compressed.2. a. The process by which the working substance in a heat engine, such as the vapor mixture in the cylinder of an internal-combustion engine, is compressed.b. The engine cycle during which this process occurs.3. Computers The process by which data is compressed into a form that minimizes the space required to store or transmit it.
com·pres′sion·al adj.compression (kəmˈprɛʃən) n1. Also called: compressure the act of compressing or the condition of being compressed2. (Mechanical Engineering) an increase in pressure of the charge in an engine or compressor obtained by reducing its volumecom•pres•sion (kəmˈprɛʃ ən)
n. 1. the act of compressing. 2. the state of being compressed. 3. the effect or result of being compressed. 4. (in internal-combustion engines) the reduction in volume and increase of pressure of the air or combustible mixture in the cylinder prior to ignition. 5. reduction of the size of computer data by efficient storage. Also, com•pres′sure (for defs. 1, 2). [1350–1400; Middle English (< Anglo-French) < Latin] com•pres′sion•al, adj. com·pres·sion (kəm-prĕsh′ən) A force that tends to shorten or squeeze something, decreasing its volume.Thesaurus| Noun | 1. |  compression - an increase in the density of somethingcompaction, densification, concretionconcentration - increase in density | | 2. | compression - the process or result of becoming smaller or pressed together; "the contraction of a gas on cooling"contraction, condensationshrinkage, shrinking - process or result of becoming less or smaller; "the material lost 2 inches per yard in shrinkage"coarctation, constriction - tight or narrow compression | | 3. | compression - encoding information while reducing the bandwidth or bits requiredencoding, encryption - the activity of converting data or information into codeimage compression - the compression of graphics for storage or transmissionMPEG - a set of standards adopted by the moving pictures experts group for the compression of digital video and audio data or a file of data compressed according to those standardsdecompression - restoring compressed information to its normal form for use or display | | 4. | compression - applying pressurecompressingpressing, pressure, press - the act of pressing; the exertion of pressure; "he gave the button a press"; "he used pressure to stop the bleeding"; "at the pressing of a button"squeeze, squeezing - the act of gripping and pressing firmly; "he gave her cheek a playful squeeze"condensing, condensation - the act of increasing the density of somethingcompaction, crunch, crush - the act of crushingconstriction - the action or process of compressingdecompressing, decompression - relieving pressure (especially bringing a compressed person gradually back to atmospheric pressure) |
compressionnoun squeezing, pressing, crushing, consolidation, condensation, constriction The compression of the wood is easily achieved.compressionnounA compressing of something:constriction, squeeze.Translationscompress (kəmˈpres) verb to press together; to force into a narrower space. All his belongings were compressed into a very small suitcase. 壓縮 压缩comˈpressible adjective 可壓縮的 可压缩的comˈpression (-ʃən) noun 壓縮 压缩compressed air air which is at a pressure higher than atmospheric pressure. Deep sea divers breathe compressed air. 壓縮空氣 压缩空气compression
compression, external stress applied to an object or substance, tending to cause a decrease in volume (see pressurepressure,
in mechanics, ratio of the force acting on a surface to the area of the surface; it is thus distinct from the total force acting on a surface. A force can be applied to and sustained by a single point on a solid.
..... Click the link for more information. ). Gases can be compressed easily, solids and liquids to a very small degree if at all. Water, for example, is practically incompressible, thus making it especially useful for hydraulic machineshydraulic machine,
machine that derives its power from the motion or pressure of water or some other liquid. Hydraulic Engines
Water falling from one level to a lower one is used to drive machines like the water wheel and the turbine.
..... Click the link for more information. . According to the kinetic-molecular theory of gaseskinetic-molecular theory of gases,
physical theory that explains the behavior of gases on the basis of the following assumptions: (1) Any gas is composed of a very large number of very tiny particles called molecules; (2) The molecules are very far apart compared to their sizes,
..... Click the link for more information. , when the molecules of a gas are brought close enough together by compression, the gas (under certain conditions of temperature) undergoes liquefactionliquefaction,
change of a substance from the solid or the gaseous state to the liquid state. Since the different states of matter correspond to different amounts of energy of the molecules making up the substance, energy in the form of heat must either be supplied to a substance
..... Click the link for more information. . This principle is applied commercially to several gases, including liquid oxygen and the so-called bottled gas (a mixture of hydrocarbons) used as a fuel. Boyle's law deals with the decrease in the volume of a gas in relation to the increase of pressure upon it (see gas lawsgas laws,
physical laws describing the behavior of a gas under various conditions of pressure, volume, and temperature. Experimental results indicate that all real gases behave in approximately the same manner, having their volume reduced by about the same proportion of the
..... Click the link for more information. ). The ability or the degree to which an internal-combustion engine reduces the volume of its fuel mixture preparatory to firing is called its compression. Also, a region of high pressure in a fluid is called a compression; thus sound waves are said to propagate at compressions and rarefactions (regions of low pressure) of their medium, such as air.CompressionDirect pushing force, in line with the axis of the member: the opposite of tension.Compression (in Russian, kompressiia), a force effect on a gaseous body that reduces the volume occupied by the gas and increases its pressure and temperature. Compression is achieved by means of compressors and during the operation of internal combustion engines and other equipment. Russian technical literature usually uses the word szhatie instead of kompressiia, although the meaning of the former is more general, since it also covers solids and volume reduction upon cooling. compression[kəm′presh·ən] (computer science) data compression (electronics) Reduction of the effective gain of a device at one level of signal with respect to the gain at a lower level of signal, so that weak signal components will not be lost in background and strong signals will not overload the system. compression ratio (geodesy) flattening (geology) A system of forces which tend to decrease the volume or shorten rocks. (mechanics) Reduction in the volume of a substance due to pressure; for example in building, the type of stress which causes shortening of the fibers of a wooden member. (mechanical engineering) compression ratio compression1. The state of being compressed, or being shortened by a force. 2. The change in length produced in a test specimen by a compressive load.flatteningThe ratio of the difference between the equatorial radius (major semi-axis) and the polar radius (minor semi-axis) of the earth to the equatorial radius. Also called compression. The flattening of the earth is the ellipticity of the spheroid, and it equals the ellipticity of the ellipse forming a meridianal section of the spheroid. If a and b represent the major and minor semi-axes of the spheroid, respectively, and f is the flattening of the earth, f= (a – b)/a. The magnitude of the flattening is sometimes expressed by stating the numerical value of the reciprocal of the flattening, a/(a – b).compression Engineering an increase in pressure of the charge in an engine or compressor obtained by reducing its volume compression (application)(Or "compaction") The coding of data to savestorage space or transmission time. Although data is alreadycoded in digital form for computer processing, it can often becoded more efficiently (using fewer bits). For example,run-length encoding replaces strings of repeated characters(or other units of data) with a single character and a count.There are many compression algorithms and utilities.Compressed data must be decompressed before it can be used.
The standard Unix compression utilty is called compressthough GNU's superior gzip has largely replaced it. Othercompression utilties include pack, zip and PKZIP.
When compressing several similar files, it is usually betterto join the files together into an archive of some kind(using tar for example) and then compress them, rather thanto join together individually compressed files. This isbecause some common compression algorithms build up tablesbased on the data from their current input which they havealready compressed. They then use this table to compresssubsequent data more efficiently.
See also TIFF, JPEG, MPEG, Lempel-Ziv Welch,"lossy", "lossless".
Compression FAQ.
Web Content Compression FAQ.
Usenet newsgroups: news:comp.compression,news:comp.compression.research.compression (multimedia)Reducing the dynamic range of an audio signal,making quiet sounds louder and loud sounds quieter. Thus,when discussing digital audio, the preferred term for reducingthe total amount of data is "compaction". Some advocate thisterm in all contexts.compression
compression [kom-presh´un] 1. the act of pressing upon or together; the state of being pressed together.2. in embryology, the shortening or omission of certain developmental stages.3. the flattening of soft tissue to improve optical density in radiographic procedures such as mammography.com·pres·sion (kom-presh'ŭn), A squeezing together; the exertion of pressure on a body in such a way as to tend to increase its density; the decrease in a dimension of a body under the action of two external forces directed toward one another in the same straight line.compression Clinical medicine Squeezing; pressure on a body or vital structure by 2 or more external forces, where the force is exerted by the bodies in a linear direction toward each other Telemedicine A process used to transmit graphic images by eliminating extraneous data and packaging the file into lean block of data that is de-compressed by the receiver Types Lossless, lossy. See Lossless compression, Lossy compression. com·pres·sion (kŏm-presh'ŭn) A squeezing together; the exertion of pressure on a body to tend to increase its density; the decrease in a dimension of a body under the action of two external forces directed toward one another. CompressionAn increase in pressure from the surrounding water that occurs with increasing diving depth.Mentioned in: Gas Embolism, Nitrogen Narcosiscom·pres·sion (kŏm-presh'ŭn) A squeezing together; the exertion of pressure on a body in such a way as to tend to increase its density. FinancialSeeCCSee CPR
See CECOM Performance Reviewcompression
Related to compression: image compression, compression ratio, Data compression, Video compressionSynonyms for compressionnoun squeezingSynonyms- squeezing
- pressing
- crushing
- consolidation
- condensation
- constriction
Synonyms for compressionnoun a compressing of somethingSynonymsSynonyms for compressionnoun an increase in the density of somethingSynonyms- compaction
- densification
- concretion
Related Wordsnoun the process or result of becoming smaller or pressed togetherSynonymsRelated Words- shrinkage
- shrinking
- coarctation
- constriction
noun encoding information while reducing the bandwidth or bits requiredRelated Words- encoding
- encryption
- image compression
- MPEG
Antonymsnoun applying pressureSynonymsRelated Words- pressing
- pressure
- press
- squeeze
- squeezing
- condensing
- condensation
- compaction
- crunch
- crush
- constriction
Antonyms- decompressing
- decompression
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