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41 reaction
1. n реакция, реагирование2. n разг. отклик; мнениеwhat was his reaction to this news? — как он реагировал на это известие?, что он сказал, когда услышал эту новость?
3. n уст. воздействие; влияние, действие4. n противодействие; обратное действие5. n тех. сила реакции; реакцияreaction coil — реактивная катушка; реактор
6. n мед. реакция; упадок сил7. n мед. повышенное возбуждение8. n мед. реакция, проба9. n мед. элк. регенерация, положительная обратная связь10. n полит. реакция, реакционностьСинонимический ряд:1. direct response (noun) backlash; counteraction; direct response; recoil; response; retreat; retrogression; return; reversal2. political conservatism (noun) conservatism; political conservatism; reactionary groups; status quo; ultraconservatism3. reply (noun) answer; feedback; impression; rebuttal; rejoinder; reply; reprisal; retort; verbal response4. working (noun) behaviour; functioning; operation; performance; working -
42 curve
1. кривая3. график4. эпюра (рабочий чертёж, показывающий распределение величины нагрузки на объект) (see also diagram)allowable stress curve — кривая допустимых напряжений
cooling curve — кривая охлаждения
creep curve — кривая ползучести
creep rate-stress curve — кривая зависимости скорости ползучести [крипа] от напряжения
creep strain-time curve — кривая временной зависимости деформации при ползучести [крипе]
cyclic stress-strain curve — диаграмма циклического деформирования
geodesic curve — геодезическая линия
hysteresis curve — кривая [петля] гистерезиса
liquidus curve — 1) кривая ликвидуса, ликвидус 2) диаграмма плавкости
load-strain curve — кривая зависимости деформации от нагрузки
matrix stress-strain curve — диаграмма зависимости деформации от напряжения для матрицы, деформационная кривая матрицы
melting curve — 1) кривая ликвидуса, ликвидус 2) диаграмма плавкости
pressure-strain curve — кривая [график] изменения деформации от давления, график давление-деформация
shearing force curve — эпюра срезающих [перерезающих, поперечных] сил
solidus curve — кривая солидуса, солидус
stress-distribution curve — кривая распределения напряжений
temperature distribution curve — кривая распределения температур
temperature-time curve — кривая термического цикла
time-temperature-transformation curve — 1) S-образные кривые зависимости между временем, температурой и превращениями ( в сталях) 2) кривые изотермического распада аустенита
true-stress-true-strain curve — кривая зависимости между истинным напряжением и истинной деформацией
English-Russian dictionary of aviation and space materials > curve
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43 spontaneous reaction
The English-Russian dictionary general scientific > spontaneous reaction
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44 primary switch mode power supply
- импульсный источник электропитания с коммутацией тока на первичной стороне
импульсный источник электропитания с коммутацией тока на первичной стороне
-In primary switch mode power supplies, the AC mains voltage is first rectified and smoothed and then chopped ("switched"). Chopping means that the DC voltage is switched periodically at a frequency of 40 to 200 kHz using a power transistor.
In contrast to linearly regulated power supplies, the power transistor does not act as a variable resistor but as a switch instead. This generates a square-wave AC voltage that is transformed to the secondary circuit using a high-frequency transformer. In the secondary circuit, the voltage is rectifi ed and smoothed. The quantity of energy transformed to the secondary circuit is controlled, depending on the load, by varying the chopping rate. The longer the transistor is conductive, the higher is the quantity of energy transformed to the secondary circuit ( pulse width modulation).
Due to the use of high-frequency AC voltage, primary switch mode power supplies have the decisive advantage that their transformer can be of much smaller size than required for the transformation of low frequencies. This reduces the weight and the dissipation inside the unit. The effi ciency of these units is between 85 and 95 %. Since the output voltage does not directly depend on the input voltage, these units can be used for a wide input voltage range and can even be supplied with DC voltage. Furthermore, it is possible to buffer short-time mains voltage breakdowns up to 200 ms. However, the power failure buffering time is limited by the size of capacitor C1 since a longer buffering time requires a higher capacity and thus a bigger size of the capacitor. Especially in case of small power supplies this is not desirable.
Therefore, a practicable compromise has to be made between the size of the power supply and the buffering time.
Primary switch mode power supplies can be used for all purposes. For example, they are suitable for the supply of all kind of electronics as well as for electromechanical applications.
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Англо-русский словарь нормативно-технической терминологии > primary switch mode power supply
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