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Subjects: Chemistry >> Inorganic Chemistry

在这里，我们报告了一种高温气体迁移策略来制备多相的单原子铁催化剂，并展示其优良的类天然酶的活性（定义为单原子酶，SAE）。 结果表明，Fe SAE的局部定义明确的FeN4位点与含血红素的天然酶的活性金属中心高度相似。 Fe SAE表现出超级高的类过氧化物酶，氧化酶和过氧化氢酶的活性，超过了Fe3O4纳米酶40倍。更重要的是，Fe SAE可以有效活化过氧化氢（H2O2）产生羟基自由基（?OH）。 这使得其可以作为一种多相化的类Fenton系统，可以应对不断增加的环境污染。 我们的研究结果开辟了一个新的人造材料家族-模仿天然 |

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2018-10-04
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Motion of photons in a background of gravitational wave

Zhe Chang; Chao-Guang Huang; Zhi-Chao ZhaoSubjects: Physics >> General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

The photon motion in a Michelson interferometer is re-analyzed in both geometrical optics and wave optics. The classical paths of the photons in the background of gravitational wave are derived from Fermat principle, which is the same as the null geodesics in general relativity. The deformed Maxwell equations and the wave equations of electric elds in the background of gravitational wave are presented in at-space approximation. Both methods show that the response of an interferometer depends on the frequency of a gravitational wave, however it is almost independent of the frequency of the mirror's vibrations. It implies that the vibrating mirror cannot mimic a gravitational wave very well. |

Is GW151226 a really signal of gravitational wave?

Zhe Chang; Chao-Guang Huang; Zhi-Chao ZhaoSubjects: Physics >> General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

Recently, the LIGO Scienti?c Collaboration and Virgo Collaboration published the second observation on gravitational wave GW151226 [Phys. Rev. Lett. 116, 241103 (2016)] from the binary black hole coalescence with initial masses about 14 M and 8 M. They claimed that the peak gravitational strain was reached at about 450 Hz, the inverse of which has been longer than the average time a photon staying in the Fabry-Perot cavities in two arms. In this case, the phase-di?erence of a photon in the two arms due to the propagation of gravitational wave does not always increase as the photon stays in the cavities. It might even be cancelled to zero in extreme cases. When the propagation e?ect is taken into account, we ?nd that the claimed signal GW151226 would almost disappear. |

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