| 单词 | metastable |
| 例句 | In a recent experiment, this same group of researchers discovered a far more efficient way to create a previously observed metastable, superconducting-like state in K3C60 using laser light. Widely tuneable terahertz lasers boost photo-induced superconductivity in K3C60 2023-10-12T04:00:00Z In this metastable state, even a tiny external influence can cause the system to collapse into one state or another. Light and sound waves reveal negative pressure 2023-09-25T04:00:00Z If a majority of electrons are in the metastable state, a population inversion has been achieved. College Physics for AP Courses 2015-08-12T00:00:00Z The other half was awarded to Giorgio Parisi of Sapienza University in Rome, for his work studying spin glasses—magnetic materials that are in a constant “metastable” state, balanced between chaos and order. Physics Nobel Honors Breakthroughs in Understanding Climate and Other Complex Systems 2021-10-05T04:00:00Z Our "metastable minds" are emergent properties of lower frequency fluctuations that conjoin into "nested hierarchies" with higher frequency fluctuations. Most brain activity is "background noise" — and that's upending our understanding of consciousness 2021-02-20T05:00:00Z The binding energy of an atom or ion — the energy required to break the atom into its free electrons and a nucleus — is different in an excited metastable state from that in the ground state. Mass spectrometry for future atomic clocks 2020-05-05T04:00:00Z In their current research, the scientists are examining the metastable state of liquids with negative pressure. Light and sound waves reveal negative pressure 2023-09-25T04:00:00Z An electron spontaneously falls from the metastable state, emitting a photon. College Physics for AP Courses 2015-08-12T00:00:00Z The simulations showed that the pearl phase corresponds to the lowest-energy state of the grain boundary, whereas the domino phase is in a metastable state. Phase transformations observed at the interfaces between crystalline grains in pure metals 2020-03-17T04:00:00Z Diamond itself is an example of a material that forms at high pressure but is metastable at ambient pressure. Superconductivity near room temperature 2019-05-21T04:00:00Z There, he worked with a young chemist, Glenn Seaborg, to isolate an unusual, metastable isotope of his new element5. The first synthetic element 2019-01-27T05:00:00Z Due to this complication, previous measurement setups for generating and determining negative pressures have required significant laboratory space and even posed a disturbance to the system in the metastable state. Light and sound waves reveal negative pressure 2023-09-25T04:00:00Z The probability of absorption of a photon is the same as the probability of stimulated emission, and so a majority of atoms must be in the metastable state to produce energy. College Physics for AP Courses 2015-08-12T00:00:00Z The spike is caused by a special ‘metastable’ type of helium, an energetic but long-lived state created as the star’s radiation pummels the planet’s atmosphere. Astronomers Spot Helium on Exoplanet for First Time 2018-05-04T04:00:00Z Optimistically, it might eventually be possible to use similar low-pressure methods to produce metastable superconducting compounds that are initially discovered at high pressure. Superconductivity near room temperature 2019-05-21T04:00:00Z But arguably the greatest discovery remains technetium, and the metastable isotope of the element that Segrè discovered with Seaborg. The first synthetic element 2019-01-27T05:00:00Z They can exist in a specific metastable state corresponding to a negative pressure value. Light and sound waves reveal negative pressure 2023-09-25T04:00:00Z Figure 30.37 One atom in the metastable state spontaneously decays to a lower level, producing a photon that goes on to stimulate another atom to de-excite. College Physics for AP Courses 2015-08-12T00:00:00Z Salzmann, C. G., Mayer, E. & Hallbrucker, A. Thermal properties of metastable ices IV and XII: comparison, isotope effects and relative stabilities. Role of stacking disorder in ice nucleation 2017-11-07T05:00:00Z It may even be metastable, meaning that like diamond, also formed at high pressures, the metallic hydrogen would maintain its state—and even its superconductivity—once brought back to room temperatures and pressures. Diamond vise turns hydrogen into a metal, potentially ending 80 year quest 2017-01-26T05:00:00Z So, theorists generally agreed that the Higgs field is "metastable," temporarily stuck in a "false vacuum" state, and that although the collapse is a problem in principle, practically it's nothing to worry about. Tiny black holes could trigger collapse of universe—except that they don't 2015-08-03T04:00:00Z Created under pressure, the silicon structure is metastable. The Big Squeeze 2013-12-16T22:28:17Z The first excited state of helium is metastable and, thus, stores energy. College Physics for AP Courses 2015-08-12T00:00:00Z A two-photon laser system recently developed by a group at Oregon State University operates along a different scheme but displays essentially the same metastable behavior. Cavity Quantum Electrodynamics 2012-10-09T20:45:02.517Z Eventually they will unscrew the vice and see whether the metal is metastable. Diamond vise turns hydrogen into a metal, potentially ending 80 year quest 2017-01-26T05:00:00Z Excited state The laser light excited the pentacene molecules to an energy level known as a metastable state. First Practical Maser (Microwave Laser) Is Built 2012-08-16T18:15:05.413Z Often, accessing these metastable phases requires nanostructuring, as well as manufacturing composites with materials such as soft magnets. Opportunities and challenges for a sustainable energy future 2012-08-15T17:21:52.727Z Note that Table 32.1 lists many diagnostic uses for 99m Tc , where “m” stands for a metastable state of the technetium nucleus. College Physics for AP Courses 2015-08-12T00:00:00Z It's a metastable state at best, all too likely to collapse into tyranny. The Sensitive Man Visible light excites the atoms or molecules to metastable states that decay slowly, releasing the stored excitation energy partially as visible light. College Physics for AP Courses 2015-08-12T00:00:00Z The reason laser output is so pure and coherent is based on how it is produced, which in turn depends on a metastable state in the lasing material. College Physics for AP Courses 2015-08-12T00:00:00Z Most return to the ground state in less than about 10−8 s , but those in the metastable state linger. College Physics for AP Courses 2015-08-12T00:00:00Z Although these level lifetimes are short in human terms, they are many orders of magnitude longer than is typical and, thus, are said to be metastable, meaning relatively stable. College Physics for AP Courses 2015-08-12T00:00:00Z This includes those electrons originally excited to the metastable state and those that fell into it from above. College Physics for AP Courses 2015-08-12T00:00:00Z But all lasers are based on the existence of a metastable state or a phosphorescent material. College Physics for AP Courses 2015-08-12T00:00:00Z That state in neon is also metastable, and this is the one that produces the laser output. College Physics for AP Courses 2015-08-12T00:00:00Z In the common helium-neon laser, an electrical discharge pumps energy into the metastable states of both atoms. College Physics for AP Courses 2015-08-12T00:00:00Z |
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