impulse

im·pulse

I0069400 (ĭm′pŭls′)n.1. a. An impelling force; an impetus.b. The motion produced by such a force.2. A sudden wish or urge that prompts an unpremeditated act or feeling; an abrupt inclination: had an impulse to run away; an impulse of regret that made me hesitate; bought a hat on impulse.3. A motivating force or tendency: "Respect for the liberty of others is not a natural impulse in most men" (Bertrand Russell).4. Electronics A surge of electrical power in one direction.5. Physics The product obtained by multiplying the average value of a force by the time during which it acts. The impulse equals the change in momentum produced by the force in this time interval.6. Physiology The electrochemical transmission of a signal along a nerve fiber that produces an excitatory or inhibitory response at a target tissue, such as a muscle or another nerve.adj. Characterized by impulsiveness or acting on impulse: an impulse shopper; impulse buying.

[Latin impulsus, from past participle of impellere, to impel; see impel.]

impulse

(ˈɪmpʌls) n1. an impelling force or motion; thrust; impetus2. a sudden desire, whim, or inclination: I bought it on an impulse. 3. an instinctive drive; urge4. tendency; current; trend5. (General Physics) physics a. the product of the average magnitude of a force acting on a body and the time for which it actsb. the change in the momentum of a body as a result of a force acting upon it for a short period of time6. (Physiology) physiol See nerve impulse7. (Electronics) electronics a less common word for pulse¹²8. on impulse spontaneously or impulsively[C17: from Latin impulsus a pushing against, incitement, from impellere to strike against; see impel]

im•pulse

(ˈɪm pʌls)

n. 1. the influence of a particular feeling, mental state, etc.: a generous impulse. 2. sudden, involuntary inclination prompting to action: swayed by impulse. 3. an instance of this: an impulse to cry. 4. an impelling action or force driving onward or inducing motion. 5. the effect of an impelling force. 6. a progressive wave of excitation over a nerve or muscle fiber having a stimulating or inhibitory effect. 7. the product of the average force acting upon a body and the time during which it acts, equivalent to the change in the momentum of the body produced by such a force. 8. a single, usu. sudden, flow of electric current in one direction. [1640–50; < Latin impulsus pressure, impulse <impul-, variant s. of impellere to strike against; see impel]

im·pulse

(ĭm′pŭls′)1. A usually sudden flow of electrical current in one direction. Impulses typically occur as single events.2. An electrical signal traveling along the axon of a nerve cell. Nerve impulses excite or inhibit activity in other nerve cells or in the tissues of the body, such as muscles and glands.

Thesaurus

Noun	1.	impulse - an instinctive motive; "profound religious impulses"urgemotivation, motive, need - the psychological feature that arouses an organism to action toward a desired goal; the reason for the action; that which gives purpose and direction to behavior; "we did not understand his motivation"; "he acted with the best of motives"abience - (psychology) an urge to withdraw or avoid a situation or an objectadience - (psychology) an urge to accept or approach a situation or an objectdeath instinct, death wish, Thanatos - (psychoanalysis) an unconscious urge to dieitchy feet, wanderlust - very strong or irresistible impulse to travel
	2.	impulse - a sudden desire; "he bought it on an impulse"caprice, whimdesire - the feeling that accompanies an unsatisfied state
	3.	impulse - the electrical discharge that travels along a nerve fiber; "they demonstrated the transmission of impulses from the cortex to the hypothalamus"nerve impulse, nervous impulse, neural impulseelectrical discharge - a discharge of electricityaction potential - the local voltage change across the cell wall as a nerve impulse is transmitted
	4.	impulse - (electronics) a sharp transient wave in the normal electrical state (or a series of such transients); "the pulsations seemed to be coming from a star"pulsation, pulse, pulsingelectronics - the branch of physics that deals with the emission and effects of electrons and with the use of electronic devicesundulation, wave - (physics) a movement up and down or back and forth
	5.	impulse - the act of applying force suddenly; "the impulse knocked him over"impetus, impulsiondrive, driving force, thrust - the act of applying force to propel something; "after reaching the desired velocity the drive is cut off"
	6.	impulse - an impelling force or strength; "the car's momentum carried it off the road"momentumforcefulness, strength, force - physical energy or intensity; "he hit with all the force he could muster"; "it was destroyed by the strength of the gale"; "a government has not the vitality and forcefulness of a living man"

impulse

noun1. urge, longing, desire, drive, wish, fancy, notion, yen (informal), instinct, yearning, inclination, itch, whim, compulsion, caprice He resisted an impulse to smile.2. spontaneity, impetuosity, carelessness, irresponsibility, wildness, thoughtlessness, rashness, heedlessness, incautiousness He is a creature of impulse.3. force, pressure, push, movement, surge, motive, thrust, momentum, stimulus, catalyst, impetus Their impulse of broadcasting was for human rights.4. pulse, beat, current, wave, stroke, rhythm, oscillation the electrical impulse which keeps the heart beatingon impulse impulsively, of your own accord, freely, voluntarily, instinctively, spontaneously, impromptu, off the cuff (informal), in the heat of the moment, off your own bat, quite unprompted After lunch she decided, on impulse, to take a bath.Quotations
"I am the very slave of circumstance"
"And impulse - borne away with every breath!" [Lord Byron Sardanapalus]
"To our strongest impulse, to the tyrant in us, not only our reason but also our conscience yields" [Friedrich Nietzsche Beyond Good and Evil]
"Have no truck with first impulses for they are always generous ones" [Casimir, Comte de Montrond]

impulse

noun1. Something that causes and encourages a given response:encouragement, fillip, impetus, incentive, inducement, motivation, prod, push, spur, stimulant, stimulation, stimulator, stimulus.2. An impulsive, often illogical turn of mind:bee, boutade, caprice, conceit, fancy, freak, humor, megrim, notion, vagary, whim, whimsy.Idiom: bee in one's bonnet.

Translations

冲力冲动脉冲

impulse

(ˈimpals) noun1. a sudden desire to do something, without thinking about the consequences. I bought the dress on impulse – I didn't really need it冲动2. a sudden force or stimulation. an electrical impulse. 冲力，脉冲 imˈpulsive (-siv) adjective done, or likely to act, suddenly, without careful thought. an impulsive action; You're far too impulsive!冲动的imˈpulsively adverb冲动地imˈpulsiveness noun冲动

impulse

impulse,

in mechanics: see momentummomentum
, in mechanics, the quantity of motion of a body, specifically the product of the mass of the body and its velocity. Momentum is a vector quantity; i.e., it has both a magnitude and a direction, the direction being the same as that of the velocity vector.
..... Click the link for more information. .

Impulse (mechanics)

The integral of a force over an interval of time. For a force F , the impulse J over the interval from t₀ to t₁ can be written as Eq. (1). (1) The impulse thus represents the product of the time interval and the average force acting during the interval. Impulse is a vector quantity with the units of momentum.

The momentum-impulse relation states that the change in momentum of a mass m over a given time interval equals the impulse of the resultant force acting during that interval. The momentum change can be expressed in terms of the velocities v ₁ and v ₀ at times t₁ and t₀, respectively, giving Eq. (2). (2) See Impact, Momentum

Impulse

(in Russian, impul’s). (1) Mechanical impulse is a measure of mechanical motion; it is a vector quantity that for a mass particle is equal to the product of the mass m of the particle and its velocity v and has the same direction as the velocity vector: p = mv; the same as momentum. [In Russian the terms impul’s and kolichestvo dvizheniia are used interchangeably to mean “momentum”; the term impul’s sily denotes “impulse” as understood in American usage. See alsoIMPULSEandMOMENTUM.] For a particle moving with a speed close to the speed of light in a vacuum c, the dependence of its mass on velocity must be taken into account: , where m₀ is the mass of a particle at rest (the so-called rest mass). In this case the momentum of a free particle is , and the relationship between the total energy ε of a particle and its impulse is given by the relation ε² = p²c² + m₀²c⁴. For a particle with zero rest mass (such as a photon or neutrino), p = ε/c; such particles always move at the speed of light c.

All forms of matter, including electromagnetic and gravitational fields, have momentum. The momentum density vector (the momentum per unit volume occupied by the field), which is expressed in terms of field intensity, potentials, and so on, is introduced for fields.

(2) A wave impulse is a single perturbation that is propagating in space or in a medium. An example of such an impulse is a sound pulse (such as the sound of a pistol shot), which is an abrupt and rapidly vanishing rise in pressure that produces a wave front of a short-lived increase in pressure that propagates from the place of the disturbance. Such as isolated pulse consists of all the frequency components of a continuous spectrum, from the lowest to those whose period is close to the duration of the pulse. Such a sound pulse is used to determine the frequency characteristics of receivers, as well as in architectural acoustics to detect echoes and to determine the reverberation time in buildings.

Another example of a wave pulse is an electromagnetic perturbation that propagates from the place of a rapid change in an electric or magnetic field induced, for example, by a strong spark, lightning, or some other pulsed electrical process. The spectrum of such an electromagnetic impulse is also continuous and contains all frequencies from the lowest to the extremely high.

A light pulse is a brief emission of light (0.01 sec or less) by an optical radiation source. The spectral composition of a light pulse is determined by the type of source, which may be a pulsed electrical discharge in gases or the flash that accompanies the explosion of a fine conductor when a strong electric current is passed through it. The short duration of such pulses makes possible the production of high instantaneous values of the light radiation power, reaching 10⁶ kilowatts (kW) in some cases. Light pulses are used to study processes that proceed rapidly (for example, in high-speed still and motion-picture photography and in the photography of the tracks of elementary particles in tracking instruments), for the optical pumping of lasers, in automatic devices having photoelectric control and information channels, and in light signaling equipment.

Pulses are usually used in physics and technology in the form of a short train or group of waves. Such a pulse may be isolated or may be repeated after time intervals longer than or comparable to its duration. A sound signal (pulse) of specific frequency, whose duration is a few periods (10–100), is often used in acoustics. Sonic and ultrasonic pulses are used extensively in hydroacoustical research, especially to measure depth, in hydrolocation, and in ultrasonic flaw detection.

Light pulses, which are short wave trains, may be emitted by lasers operating in the pulsed mode. The impulse may last 10⁻¹⁰ or 10⁻¹² sec, and the power may reach 1 billion kW.

A single, brief surge of electrical current or voltage is called a current or voltage pulse.

Impulse

a measure of the action of a force over some time interval; it is equal to the product of the average value of the force F_av and the time t₁ of its action: S = F_avt₁. Impulse is a vector quantity and has the same direction as F_av, The exact value of impulse over a time interval t₁ is determined by an integral: F dt. When a mass point moves under the action of a force F, its momentum receives over time t₁ an increment equal to the impulse:

S = mv₀− mv₁ S = mv₀− mv₁

where mv₀ and mv₁ are the momentums of the particle at the beginning and end of the time interval t₁, respectively.

The concept of impulse is used widely in mechanics, especially in impact theory, where a quantity equal to the impulse of the impact force F_imp over the time of impact τ is called the impact impulse.

impulse

[′im‚pəls] (mechanics) The integral of a force over an interval of time. (metallurgy) A single pulse or several pulses in welding current used in resistance welding. (physics) A pulse which lasts for so short a time that its duration can be thought of as infinitesimal. (psychology) A sudden psychogenic urge to act.

impulse

1. Physicsa. the product of the average magnitude of a force acting on a body and the time for which it acts b. the change in the momentum of a body as a result of a force acting upon it for a short period of time 2. Physiol See nerve impulse3. Electronics a less common word for pulse

impulse

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Impulse (mechanics)

Impulse

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Patient discussion about impulse

IMPULSE

impulse

Synonyms for impulse

noun urge

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noun spontaneity

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noun force

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noun pulse

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phrase on impulse

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noun something that causes and encourages a given response

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noun an impulsive, often illogical turn of mind

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Synonyms for impulse

noun an instinctive motive

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noun a sudden desire

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noun the electrical discharge that travels along a nerve fiber

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noun (electronics) a sharp transient wave in the normal electrical state (or a series of such transients)

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noun the act of applying force suddenly

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noun an impelling force or strength

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