Science,18 March 2022, Vol.375, No.6586.
Science, March 2022, 18, Vol. 375, No.6586.
Physics physics
Frequency-Dependent Polarization of Repetitive Fast Radio Bursts: Implications for its Origin
Polarized repetitive fast radio pulse
Authors: Di Li, Yuan, Long, Wei, Zhang Bing,
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Es depolarizes below the threshold frequency, which varies from source to source. It is found that all repeated FRBs are 100% polarized at the source before radio waves scatter complex foreground structures (such as supernova remnants). These results limit the theory of repeating FRB emission mechanism.
Layer-resolved intermolecular reactions mediated by dipole spin exchange
Layer-resolved reactions mediated by dipole spin exchange between molecules
Authors: William G. tobias, Kyle Matsuda, Li Junru, Calder Miller, Jun Ye, etc.
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Due to long-range anisotropy and tunable dipole interaction, complex quantum phenomena are not available on other platforms. Using precise electric field control, Tobias et al demonstrated the layer-resolved creation and imaging of ultracold potassium-rubidium molecules confined in two-dimensional planes in optical lattices. They also studied spin exchange and chemical reactions, which show that they are highly dependent on the interlayer detuning introduced by molecular temperature and electric field gradient. This work shows the high control of ultracold molecules in optical lattices, and it is a promising step to explore new phenomena in reduced-dimensional quantum gas systems.
Spectral characteristics of electron correlation in three-layer graphene /hBN Moore superlattice
Spectral characteristics of electron correlation in three-layer graphene superlattices
Authors: Ji Xiangyang, Tian Yihan, Zhang, Ya, Long Ju, etc.
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A site complex that was not seen in previous buildings. Lipids play an important role in stabilizing various parts of the structure, and the recovery of activity in these samples is consistent with the newly observed metal binding sites involved in methane oxidation.
Ecological ecology
Wildfire smoke destroys stratospheric ozone
Wildfire smoke destroys stratospheric ozone
Authors: Peter Bernard, Chris Boone and Jeff Klaus.
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Combustion products enter the stratosphere. Bernath et al.' s research shows that the black fire in Australia in the summer of 20 19-2020 will transport compounds to the stratosphere, which will lead to extreme disturbance of stratospheric gas composition and may destroy ozone. As severe wildfires become more frequent due to climate change, their impact on the global ozone budget will increase.