| 释义 |
operator
op·er·a·tor O0094000 (ŏp′ə-rā′tər)n.1. a. One who operates a machine or device: the operator of a forklift.b. The owner or manager of a business.c. A military person who executes a special operation.d. Informal A person who is adept at accomplishing goals through shrewd or unscrupulous maneuvers.2. Mathematics A function, especially one from a set to itself, such as differentiation of a differentiable function or rotation of a vector.3. A logical operator.4. Genetics A chromosomal segment of DNA that regulates the activity of the structural genes of an operon by interacting with a specific repressor.operator (ˈɒpəˌreɪtə) n1. a person who operates a machine, instrument, etc, esp, a person who makes connections on a telephone switchboard or at an exchange2. a person who owns or operates an industrial or commercial establishment3. (Stock Exchange) a speculator, esp one who operates on currency or stock markets4. informal a person who manipulates affairs and other people5. (Mathematics) maths any symbol, term, letter, etc, used to indicate or express a specific operation or process, such as Δ (the differential operator)op•er•a•tor (ˈɒp əˌreɪ tər)
n. 1. a person who operates a machine, apparatus, or the like. 2. a person who operates a telephone switchboard. 3. a person who manages an industrial establishment. 4. a person who trades in securities, esp. speculatively or on a large scale. 5. a person who performs a surgical operation; a surgeon. 6. a. a symbol for expressing a mathematical or logical operation. b. a function, esp. one transforming a function, set, etc., into another. 7. a person who accomplishes his or her purposes by cleverness. 8. a segment of DNA that interacts with a regulatory molecule, preventing transcription of the adjacent region. [1590–1600; < Late Latin] Thesaurus| Noun | 1. | operator - (mathematics) a symbol or function representing a mathematical operationmath, mathematics, maths - a science (or group of related sciences) dealing with the logic of quantity and shape and arrangementfunction, mapping, mathematical function, single-valued function, map - (mathematics) a mathematical relation such that each element of a given set (the domain of the function) is associated with an element of another set (the range of the function)linear operator - an operator that obeys the distributive law: A(f+g) = Af + Ag (where f and g are functions)identity element, identity operator, identity - an operator that leaves unchanged the element on which it operates; "the identity under numerical multiplication is 1" | | 2. |  operator - an agent that operates some apparatus or machine; "the operator of the switchboard"manipulatorcausal agency, causal agent, cause - any entity that produces an effect or is responsible for events or resultscompany operator - an operator who works for a companydriver - the operator of a motor vehicleelevator operator - an operator of an elevatorengine driver, locomotive engineer, railroad engineer, engineer - the operator of a railway locomotivehoister - an operator of a hoistjockey - an operator of some vehicle or machine or apparatus; "he's a truck jockey"; "a computer jockey"; "a disc jockey"motorman - the operator of streetcarradio operator - someone who operates a radio transmitterswitchman - a man who operates railroad switchestelegraph operator, telegrapher, telegraphist - someone who transmits messages by telegraphswitchboard operator, telephone operator, telephonist - someone who helps callers get the person they are calling | | 3. | operator - someone who owns or operates a business; "who is the operator of this franchise?"businessman, man of affairs - a person engaged in commercial or industrial business (especially an owner or executive)supermarketeer, supermarketer - an operator of a supermarket | | 4. |  operator - a shrewd or unscrupulous person who knows how to circumvent difficultieswheeler dealer, hustlercolloquialism - a colloquial expression; characteristic of spoken or written communication that seeks to imitate informal speechopportunist, self-seeker - a person who places expediency above principlewire-puller - one who uses secret influence (i.e. pulls wires or strings) for his own ends | | 5. | operator - a speculator who trades aggressively on stock or commodity marketsplunger, speculator - someone who risks losses for the possibility of considerable gains |
operatornoun1. worker, hand, driver, mechanic, operative, conductor, technician, handler, skilled employee He first of all worked as a machine operator.2. contractor, dealer, trader, administrator the country's largest cable TV operator3. (Informal) manipulator, worker, mover, Machiavellian, mover and shaker, machinator, wheeler-dealer (informal), wirepuller one of the shrewdest political operators in the Arab worldoperatornoun1. A person who operates a motor vehicle:driver, motorist.2. One who speculates for quick profits:adventurer, gambler, speculator.Translationsoperate (ˈopəreit) verb1. to act or work. The sewing-machine isn't operating properly. 運轉 运转2. to do or perform a surgical operation. The surgeon operated on her for appendicitis. 施行手術 施行手术ˌopeˈration noun1. an action or process, especially when planned. a rescue operation. 操作，作業 操作，工作 2. the process of working. Our plan is now in operation. 運轉 运转3. the act of surgically cutting a part of the body in order to cure disease. an operation for appendicitis. 手術 手术4. (often in plural) the movement, fighting etc of armies. The general was in command of operations in the north. 軍事行動 军事行动ˌopeˈrational adjective in good working order. 可使用的 可使用的ˈoperative (-rətiv) , ((American) -reitiv) adjective in action, having effect. Many old laws are still operative. 起作用的 起作用的ˈoperator noun1. a person who works a machine. a lift operator. 操作者 操作者2. a person who connects telephone calls. Ask the operator to connect you to that number. 電話接線員 电话接线员ˈoperating room noun (sometimes theatre) the room in a hospital in which operations are performed. 手術室 手术室
operator
smooth operatorOne who is particularly charming and persuasive in one's speech or behavior. Chad is such a smooth operator that he always has women swooning over him whenever we go out. She's a smooth operator who knows how to maneuver her way through the various levels of bureaucracy to get what she wants.See also: operator, smoothbig-time operatorA person, company, or organization that is very successful, prominent, and influential in some area of business. Once a small local farm run by Jefferies and his brothers, their berry business is now a big-time operator responsible for supplying the entire Pacific Northwest. These big-time operators have the funds to fight these civil lawsuits, but smaller companies like ours have little choice but to try and settle for an amount we can afford.See also: operatora smooth operator If you describe someone as a smooth operator, you mean that they are very successful, often by cleverly persuading other people to do what they want. As with many people in the Foreign Office, he is a smooth operator and able to avoid conflict.See also: operator, smoothbig-time operator and BTO1. n. someone who does business in a big way. (The abbreviation is an initialism.) If you’re such a BTO, why are we standing here in the rain? 2. n. a man who chases women. That twit thinks he’s a big-time operator. A stud he’s not. A big-time operator needs a big-time car! See also: operatorsmooth operator and smoothie n. a clever and quiet person, especially in reference to romantic involvement; a seducer. He thinks he’s such a smooth operator! Clare is an old smoothie till she thinks she’s got everything the way she wants. Then you see the real Clare. See also: operator, smoothoperator
operator Maths any symbol, term, letter, etc., used to indicate or express a specific operation or process, such as Δ (the differential operator) Operator a mathematical concept denoting, in its most general sense, a correspondence between the elements of two sets X and Y such that with each element x in X there is associated an element y in Y. An equivalent meaning is conveyed by the terms “operation,” “mapping,” “transformation,” and “function.” The element y is called the image of x, and x is called the preimage of y. When X and Y are sets of numbers, the term “function” is usually used. An operator that maps an infinite-dimensional space to a set of real or complex numbers is called a functional. The most important class of operators is that of linear operators in normed linear spaces. Differential and integral operators play an important role in physics and mathematical analysis. Various properties of operators, operations on operators, and the use of operators in the solution of various mathematical problems are studied in operator theory.
Operator (in quantum theory), a mathematical concept widely used in the mathematical apparatus of quantum mechanics and quantum field theory to compare a given state vector or wave function ψ with other given vectors or functions ψʹ. The relation between ψ and ψʹ is written in the form ψʹ = L̂ψ where L̂ is an operator. In quantum mechanics, operators L̂ such as the coordinate and momentum operators, that act on the state vector or wave function ψ—that is, the quantity that describes the physical state of a system—correspond to such physical quantities L as coordinates, momentum, angular momentum, and energy. The simplest types of operators acting on a wave function ψ(x), where x is the coordinate of a particle, are (1) the multiplication operator—for example, the coordinate operator x̂, x̂ψ = xψ and (2) the differential operator—for example, the momentum operator p̂, p̂ψ = – iℏ(∂ψ/∂x), where i is the imaginary unit and ℏ is Planck’s constant. If ψ is a vector whose components can be represented as a column of numbers, then the operator is a matrix. Linear operators are mainly used in quantum mechanics. They have the followingʹ property: if L̂ψ1 = ψʹ1 and L̂ψ2 =ψʹ2 then L̂(c1ψ1 + c2ψ2) = c1ψʹ, c2ψʹ2, where c1 and c2 are complex numbers. This property reflects the superposition principle, one of the fundamental principles of quantum mechanics. The essential properties of the operator L̂ are defined by the equation L̂ψn = λnψn where λn is a number. The solutions of this equation ψn are called the eigenfunctions (eigenvectors) of the operator L̂. In quantum mechanics, the wave eigenfunctions (state eigenvectors) describe states in which a given physical quantity L has a certain value λn. The numbers λn are called the eigenvalues of the operator [com], and their set is called the spectrum of the operator. The spectrum may be continuous or discrete. In the former case, the equation defining ψn has a solution for any value of λn (in a specified region), but in the latter case solutions exist only for certain discrete values of λn. The operator spectrum may also be mixed: partly continuous, partly discrete. For example, the coordinate and momentum operators have continuous spectra, but the energy operator may have a continuous, discrete, or mixed spectrum, depending on the nature of the forces acting in the system. The discrete eigenvalues of the energy operator are called energy levels. The eigenfunctions and eigenvalues of the operators of physical quantities must satisfy certain requirements. Since directly measurable physical quantities always assume real values, the corresponding quantum-mechanical operators must have real eigenvalues. Further, since one possible eigenvalue of a physical quantity should be obtained as a result of measurement of the quantity in any state ψ, it is necessary that an arbitrary wave function or state vector can be represented as a linear combination of eigenfunctions or vectors ψn of the operator of the physical quantity; in other words, the set of eigenfunctions or vectors must make up a complete system. The eigenfunctions and eigenvalues of self-adjoint operators, or Hermitian operators, have these properties. Algebraic operations may be performed with operators. In particular, the product of the operators L̂1 and L̂2 is understood to be the operator L̂ =L̂1L̂2 whose action on a vector or function ψ gives L̂ψ = ψ”, if L̂2ψ = ψʹ and L̂1 ψʹ = ψ”. The product of operators usually depends on the order of the factors —that is, L̂1 L̂2.≠ L̂2 L̂1 The algebra of operators differs in this regard from the ordinary algebra of numbers. The possibility of changing the order of the factors in the product of two operators is closely connected with the possibility of the simultaneous measurement of the physical quantities to which the operators correspond. The equation L̂1L̂2 ≠ L̂2L̂1 is a necessary and sufficient condition for the simultaneous measurability of physical quantities. The equations of quantum mechanics can be formally written in precisely the same form as the equations of classical mechanics (the Heisenberg representation in quantum mechanics) if the physical quantities entering to the equations of classical mechanics are replaced by the corresponding operators. The whole difference between quantum and classical mechanics then reduces to the difference between the algebras used. In quantum mechanics operators are therefore sometimes called q-numbers, in contrast to c-numbers—that is, the conventional numbers with which classical mechanics deals. Operators can be not only multiplied but also raised to a power. Series may be formed from them, and functions of operators may be considered. The product of Hermitian operators is usually non-Hermitian. Non-Hermitian operators, of which unitary operators are an important class, are also used in quantum mechanics. Unitary operators do not change the norms (“lengths”) of vectors or the “angles” between them. The invariance of the norm of a state vector means that the vector’s components can be interpreted as probability amplitudes in both the initial and transformed functions. Therefore, the operation of a unitary operator describes the development of a quantum-mechanical system over time, and also the system’s displacement as a whole in space and its rotation, mirror reflection, and so on. The transformations performed by unitary operators (unitary transformations) play the same role in quantum mechanics as do canonical transformations in classical mechanics. The complex conjugation operator, which is nonlinear, is also used in quantum mechanics. The product of such an operator and a unitary operator is called an antiunitary operator. Antiuni-tary operators describe the transformation of time reversal and some other transformations. The method of second quantization is used extensively in the theory of quantum systems consisting of identical particles. In this method, states with an indefinite or variable number of particles are considered, and operators are introduced whose action on a state vector with a given number of particles leads to a state vector with the number of particles altered by unity (particle production and absorption operators). The particle production or annihilation operator at a given point x , [com]ψ(x), is formally similar to the wave function ψ(x), like the q- and c-numbers corresponding to the same physical quantity in quantum and classical mechanics, respectively. Such operators form quantized fields, which play a fundamental role in relativistic quantum theories (quantum electrodynamics, the theory of elementary particles). REFERENCESSee References under QUANTUM FIELD THEORY and QUANTUM MECHANICS.V. B. BERESTETSKII operator[′äp·ə‚rād·ər] (computer science) Anything that designates an action to be performed, especially the operation code of a computer instruction. (engineering) A person whose duties include the operation, adjustment, and maintenance of a piece of equipment. (genetics) A sequence at one end of an operon on which a repressor acts, thus regulating the transcription of the operon. (mathematics) A function between vector spaces. operatorA person, organization, or enterprise engaged in or offering to engage in an aircraft operation (ICAO).operator (programming)A symbol used as a function, with infix syntax if it has two arguments (e.g. "+") or prefix syntax ifit has only one (e.g. Boolean NOT). Many languages useoperators for built-in functions such as arithmetic and logic.operator(1) An organization that provides communications services. See network operator.
(2) In programming, a symbol used to perform an arithmetic or logical operation. See arithmetic operator and Boolean operator.
(3) A person who operates a computer in a datacenter and performs such activities as commanding the operating system, mounting disks and tapes and placing paper in the printer. Operators may also write the job control language (JCL), which schedules the daily work for the computer. See system development life cycle, job descriptions and salary survey.
operator
op·er·a·tor (op'ĕr-ā-tŏr), 1. One who performs an operation or operates equipment. 2. In genetics, a sequence of DNA that interacts with a repressor of operon to control the expression of adjacent structural genes. 3. A symbol representing a mathematic operation. [L. worker, fr operor, to work] operator (ŏp′ə-rā′tər)n. Genetics A chromosomal segment of DNA that regulates the activity of the structural genes of an operon by interacting with a specific repressor.operator Molecular biology
Operator gene; locus.
Surgery
Surgeon, see there.op·er·a·tor (op'ĕr-ā-tŏr) 1. One who performs an operation or operates equipment. 2. genetics A sequence of DNA that interacts with a repressor of operon to control the expression of adjacent structural genes.
See: operator gene3. A symbol representing a mathematic operation. [L. worker, fr operor, to work]Patient discussion about operatorQ. I am worried how safe the operation would be and the post surgery complications? My wife has a cyst in her right breast and further tests are going on. Doctors have advised to go for an operation. I am worried how safe the operation would be and the post surgery complications?A. My friend, surgery for the cyst in breast is common. Any cyst in breast indicates breast cancer. These surgeries are very safe. Initially they used to cut the complete breast to remove the cyst. Now with the advanced technology, only the cyst would be removed without harming other tissues. Rather complete removal is done these days, but that depend upon the severity of the cancer. These surgeries are proven with results. If the cyst is less they will remove only the affected portion and yes they do remove some nearby tissues because there some cancer cells may lay and can arrive again. For any post surgery complications, chemotherapy treatment is also available. Q. Should I do surgery for varicoceles? I went to an urologist and he recommended surgery, but I don’t know if I should do this…is it dangerous? Can I live with the varicocele? A. I don’t see your problem, you said an urologist advised you to do so- that should be enough no? if you don’t trust him, go and get a second opinion. The surgery is not that bad, an hour later and you are walking out. Vary small risk of complication. I did it and it was fine.
Q. What types of gastric bypass surgeries are there? I heard all sorts of options for gastric bypass are available. What is the most in use?A. Bariatric surgeries or – gastric bypass surgeries for weight loss fall into three categories: Restrictive procedures make the stomach smaller to limit the amount of food intake, malabsorptive techniques reduce the amount of intestine that comes in contact with food so that the body absorbs fewer calories, and combination operations employ both restriction and malabsorption. The exact one to be done should be decided with the physician according to each patients abilities and pre-operative function level. More discussions about operatorOperator
OperatorOne who holds the working or operating rights in a gas or oil activity and is obligated for the costs of development and production.See OPR
See Ooperator
Synonyms for operatornoun workerSynonyms- worker
- hand
- driver
- mechanic
- operative
- conductor
- technician
- handler
- skilled employee
noun contractorSynonyms- contractor
- dealer
- trader
- administrator
noun manipulatorSynonyms- manipulator
- worker
- mover
- Machiavellian
- mover and shaker
- machinator
- wheeler-dealer
- wirepuller
Synonyms for operatornoun a person who operates a motor vehicleSynonymsnoun one who speculates for quick profitsSynonyms- adventurer
- gambler
- speculator
Synonyms for operatornoun (mathematics) a symbol or function representing a mathematical operationRelated Words- math
- mathematics
- maths
- function
- mapping
- mathematical function
- single-valued function
- map
- linear operator
- identity element
- identity operator
- identity
noun an agent that operates some apparatus or machineSynonymsRelated Words- causal agency
- causal agent
- cause
- company operator
- driver
- elevator operator
- engine driver
- locomotive engineer
- railroad engineer
- engineer
- hoister
- jockey
- motorman
- radio operator
- switchman
- telegraph operator
- telegrapher
- telegraphist
- switchboard operator
- telephone operator
- telephonist
noun someone who owns or operates a businessRelated Words- businessman
- man of affairs
- supermarketeer
- supermarketer
noun a shrewd or unscrupulous person who knows how to circumvent difficultiesSynonymsRelated Words- colloquialism
- opportunist
- self-seeker
- wire-puller
noun a speculator who trades aggressively on stock or commodity marketsRelated Words |
