| 词汇 | supercritical |
| 释义 | supercritical adjective chemistry, physics specializeduk /ˌsuː.pəˈkrɪt.ɪ.kəl/ us /ˌsuː.pɚˈkrɪt̬.ɪ.kəl/ relating to substances that are heated to higher than their critical temperature and pressure (= the highest temperature and pressure at which a gas can be changed into a liquid), resulting in changes to the way they behave: 超临界的 Although much denser than a gas, the supercritical CO2 is less dense than water so it will start to migrate upwards.虽然比气体密度大得多，但超临界二氧化碳的密度比水小，因此它会开始向上移动。 Many common chemicals can go supercritical, for instance water, carbon dioxide and ethylene, used to make polythene shopping bags. Carbon dioxide, when it goes supercritical at just over 30C, was first used in the 1960s for extracting the caffeine from coffee beans without leaving a chemical residue. a new generation of supercritical coal-fired power stations They squeezed the gas to almost 100 times atmospheric pressure but heated it to just 35C. Once in the supercritical state, the ketones were added. Examples of supercriticalsupercritical Generally, smaller (order 0.1) input g yielded supercritical outputs, and larger (order 10) g subcritical outputs, which we now describe. A locally supercritical flow is formed, which jumps a t some location to a subcritical state. Everything after this, including the re-initiation mechanism for the supercritical case, is irrelevant if we are only concerned with the critical energy. According to the model equations, in the supercritical range, chaotic oscillations with intermittently growing amplitudes occur, resulting in repeated global flow reversals in the loop. Here the fourth order term has the wrong sign whenever p(x, t) is subcritical and the right sign where it is supercritical. Such periodic waves are not roll waves, because there is no transition from subcritical to supercritical flow in the wave. If the total mass is supercritical, why should subcritical spreading behavior be expected for the initial regime of the dynamics? The supercritical, steady two-dimensional motion, the heat transport and the stability of the motion are investigated. In both these investigations the heating was supercritical. The failure point is identified as the point where the profiles of the marginally subcritical and marginally supercritical initiation energies start to deviate significantly. There is no question of applying an 'initial' condition, in the sense that it is used in the case of disturbances under supercritical conditions. A similar analysis shows that these flows are also supercritical t o waves of that type. Two-dimensional rolls have indeed been shown to be a stable bifurcation solution for weakly supercritical convection. The flow is then supercritical and internal hydraulic jumps may occur under suitable downstream conditions. When the specifying flow is slightly supercritical, a weakly nonlinear solitary wave (29a) is possibie. See all examples of supercritical These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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