|
|
|
|
|
|
|
|
|
Impedance (acoustic)
| Глоссарий терминов по технологиям неразрушающего контроля (NDT) |
Resistance to flow of ultrasonic energy in a medium. impedance is a product of particle velocity and material density.
|
|
Impedance, английский
- The total opposition to current flow in an a.c. electrical circuit. measured in ohms.
- The total opposition offered by a device to the flow of an alternating current. measured in ohms.
- A property of all metallic and electrical conductors that describes the total opposition
- Импеданс
- A property of all metallic and electrical conductors that describes the total opposition to current flow in an electrical circuit. resistance, inductance, capacitance and conductance have various influences on the impedance, depending on frequency, dielectric material around conductors, physical relationship between conductors and external factors. is often referred to with the letter z. it is measured in ohms, whose symbol is the greek letter omegaw.
- In alternating-current electric circuits, a quantitative measure of the opposition to the flow of current upon the application of voltage; measured in ohms.
- Полное сопротивление
- Волновое сопротивление проводника; импеданс
- The complex sum of resistance and reactance. the opposition or resistance of a circuit to the flow of alternating current.
- This term is used to refer to the total opposition to the flow of current represented by the combined effect of resistance, inductance and capacitance of a circuit.
Impedance, английский
Сопротивление среды передачи распространению электромагнитных волн. определяется геометрией проводников и диэлектрическими свойствами изоляции. измеряется в омах.
Impedance (input or output), английский
- The input or output characteristic of a system component that determines the type of transmission cable to be used. the cable used must have the same characteristic impedance as the component. expressed in ohms. video distribution has standardized on 75-ohm coaxial and 124-ohm balanced cable.
- The input or output characteristic of a system component that determines the type of transmission cable to be used. expressed in ohms.
Impedance analysis, английский
In electromagnetic testing, an analytical technique that consists of correlating changes in the amplitude, phase, quadrature components, or all of these of a complex test signal voltage to the condition of the test specimen. impedance, acoustic: see acoustic impedance. impedance diagram, normalized: diagram in which the impedance of the probe in air is a reference value to which impedance values in other conditions are compared. usually the plotted data are (1) the measured reactance divided by the reactance of the coil in air versus (2) the measured resistance less the resistance in air divided by the coil reactance in air.
Impedance bond, английский
- A trackside mounted device, connected across running rails, which will allow a free flow of traction current between traction return rails and provide a connection for earthing the traction return rails and rail side structures without introducing any imbalance in the signalling track circuits.
- A connection box, usually mounted between the rails, which provides continuity of return current for traction power supply circuits where rails have been divided into insulated sections for signalling track circuit purposes.
Impedance bridge, английский
Impedance bump, английский
Скачок полного сопротивления
Impedance discontinuity, английский
Разрыв непрерывности полного сопротивления
Impedance dispersion, английский
Impedance earthed (neutral) system, английский
Impedance matching method, английский
Метод сравнения импедан- сов расчет давления во фронте ув на
Impedance plane diagram, английский
- A graphical representation of the locus of points indicating the variations in the impedance of a test coil as a function of basic test parameters such as electrical conductivity, magnetic permeability, test frequency, thickness and magnetic coupling.
- Graphical representation of the locus of points indicating the variations in the impedance of a test coil as a function of a parameter, such as conductivity or liftoff. inmotion
Impedance plethysmography, английский
Impedance protection, английский
Impedance relay, английский
Impedance test, английский
Метод определения полного электрического сопротивления см. также aztac test -зг
Impedance testing, английский
A term generally applied to eddy current testing which measures the overall change in impedance caused by variations in electromagnetic properties as differentiated from phase analysis testing which measures changes in phase.
Impedance voltage (of a transformer), английский
Resistance, английский
- Property of a conductor that opposed the current flow produced by a given difference of potential. the ohm is the practical unit of resistance.
- Уровень сопротивления - уровень цен, при котором активные продажи могут приостановить или развернуть тенденцию к повышению;
- Сопротивление (параметр)
- Сопротивление
- Сопротивление, т. е. уровень цен, при котором активные продажи могут приостановить или развернуть тенденцию к повышению.
- 1. the ability of a person not to get a disease 2. the ability of bacteria or a virus to remain unaffected by a drug the bacteria have developed a resistance to certain antibiotics. 3. opposition to a force
- Resistencia
- Устойчивость; резистентность resource for child health (reach)
- Устойчивость; резистентность
- The property of opposing movement, for example [1] electrical conductors offer resistance to the flow of electricity and dissipate some of its energy, usually as heat. [2] water resists the movement of vessels or other objects by parasitic drag, consuming some of the power available to drive the vessel forward.
- Imperviousness of the coating to mechanical, chemical, physical or weather influences
- Capacity of a member or component, or a cross-section of a member or component of a structure, to withstand actions without mechanical failure e.g. bending resistance, buckling resistance, tension resistance
- A material’s ability to restrict the flow of electrical current through itself. measured in ohms.
- The opposition of a circuit to the flow of current . resistance is measured in ohms, and can be calculated by dividing the voltage by current.
- The ability to impede (resist) the flow of electric current. with the exception of superconductors, all substances have a greater or lesser degree of resistance. substances with very low resistance, such as metals, conduct electricity well and are called conductors. substances with very high resistance, such as glass and rubber, conduct electricity poorly and are called nonconductors or insulators.
- An effective upper bound on prices achieved because of many willing sellers at that price level.
- Capacity of a component, or cross section of a component of a structure to
- The opposition to the flow of an electrical current through a conductor or circuit that does not include inductive or capacitive elements. it can be expressed as the ratio of the applied voltage to the current.
- Resistance is the opposition to the flow of an electrical current through a conductor. its unit is the ohm.
Ultrasonic, английский
- Manufacturers` association ассоциация фирм — изготовителей изделий с использованием ультразвука
- Of or relating to acoustic vibration frequencies greater than about 20 khz.
- Pertaining to acoustic vibration frequencies greater than about 20 khz.
- Of or relating to acoustic vibration frequencies greater than about 20 khz.7,22
|
Incomplete penetration, английский
- Root penetration that is less than complete or failure of a root pass and a backing pass to fuse with each other.
- In welding, root penetration less than complete or failure of a root pass and a backing pass to fuse with each other. also called lack of penetration.
Macroscopic stresses, английский
Residual stresses which vary from tension to compression in a distance (presumably many times the grain size) which is comparable to the gage length in ordinary strain measurements, hence, detectable by x-ray or dissection methods.
|
|
|
|
|
|
|
