A well-documented supercell thunderstorm occurred in Del City, Oklahoma, on 20 May 1977 is successfully simulated by a three-dimensional, nonhydrostatic storm-scale numerical model ARPS. With the numerical simulated d...A well-documented supercell thunderstorm occurred in Del City, Oklahoma, on 20 May 1977 is successfully simulated by a three-dimensional, nonhydrostatic storm-scale numerical model ARPS. With the numerical simulated data of the storm, the structure and evolution of the helicity, superhelicity and their dynamical influences on the development of the storm are investigated. The initial helical structure of environmental flow is favorable to the development of storm. In the developing stage of storm, low helicity is beneficial to the nonlinear energy cascade. However, the high helicity is of help to maintain the energy of convection cell at the mature stage of storm, and lead to a long life cycle of convective cell. Rotating thunderstorm has a tendency of adjusting to the Beltrami flow structure and tends to a higher helicity of flow. The negative superhelicity could lead to an increase of helicity. Superhelicity is negative in the initial developing process of storm however the superhelicity is positive in the mature stage of storm. Therefore, the superhelicity can be used as an indicator of the mature degree of convective storm.展开更多
Semiconductor quantum dots(QDs)with circularly polarized luminescence(CPL)characteristics hold significant promise for a range of applications,including information security,three-dimensional(3D)display,quantum comput...Semiconductor quantum dots(QDs)with circularly polarized luminescence(CPL)characteristics hold significant promise for a range of applications,including information security,three-dimensional(3D)display,quantum computing,and spintronics.Recent approaches combining QDs with chiral liquid crystal assemblies have demonstrated amplified CPL performance(specifically,luminescence dissymmetry factor,glum>10-1).However,the inherent fluidity and alignment sensitivity of chiral liquid crystals,along with QD aggregation and phase separation,continue to hinder the uniformity and long-term stability of these systems.In this work,we developed an in-situ helical co-assembly polymerization strategy that covalently incorporated InP-based QDs into chiral liquid crystal polymer templates,forming QD-based polymeric superhelical structures.We synthesized high-quality InP/ZnSeS/ZnS QDs and functionalized their surfaces with polymerizable groups to enable reactivity.By precisely tuning the photonic bandgap of the chiral liquid crystal polymers,we achieved chiral parented templates with high chiroptical activity overlapping full-visible-spectrum.Through covalent crosslinking with the QDs,a polymer network was formed,resulting in a maximum glum of 1.0.This polymerization-with-assembly approach offers exceptionally flexible and precise control over both the composition and architecture of superhelical materials,paving the way for high-quality CPL materials with broad applications in advanced technologies.展开更多
基金National Natural Science Foundation of China under the Grant !No.49605064, 49735180 State Key Basic Research Program: Resear
文摘A well-documented supercell thunderstorm occurred in Del City, Oklahoma, on 20 May 1977 is successfully simulated by a three-dimensional, nonhydrostatic storm-scale numerical model ARPS. With the numerical simulated data of the storm, the structure and evolution of the helicity, superhelicity and their dynamical influences on the development of the storm are investigated. The initial helical structure of environmental flow is favorable to the development of storm. In the developing stage of storm, low helicity is beneficial to the nonlinear energy cascade. However, the high helicity is of help to maintain the energy of convection cell at the mature stage of storm, and lead to a long life cycle of convective cell. Rotating thunderstorm has a tendency of adjusting to the Beltrami flow structure and tends to a higher helicity of flow. The negative superhelicity could lead to an increase of helicity. Superhelicity is negative in the initial developing process of storm however the superhelicity is positive in the mature stage of storm. Therefore, the superhelicity can be used as an indicator of the mature degree of convective storm.
基金supported by the National Key Research and Development Program of China(No.2021YFA1500400)the National Natural Science Foundation of China(Nos.22071226,22471253,and 224B2116)+4 种基金the Hundred Talent Program of the Chinese Academy of Sciences(No.KJ2060007002)the Collaborative Innovation Program of Hefei Science Center,Chinese Academy of Sciences(Nos.CX2060000017 and 2022HSC-CIP016)the Anhui Provincial Natural Science Foundation,China(No.BJ2060190120)the College Student Research Program(No.WW0000000888)the Funding of University of Science and Technology of China(Nos.KY2060000168,YD2060002013,and KY2060000198)。
文摘Semiconductor quantum dots(QDs)with circularly polarized luminescence(CPL)characteristics hold significant promise for a range of applications,including information security,three-dimensional(3D)display,quantum computing,and spintronics.Recent approaches combining QDs with chiral liquid crystal assemblies have demonstrated amplified CPL performance(specifically,luminescence dissymmetry factor,glum>10-1).However,the inherent fluidity and alignment sensitivity of chiral liquid crystals,along with QD aggregation and phase separation,continue to hinder the uniformity and long-term stability of these systems.In this work,we developed an in-situ helical co-assembly polymerization strategy that covalently incorporated InP-based QDs into chiral liquid crystal polymer templates,forming QD-based polymeric superhelical structures.We synthesized high-quality InP/ZnSeS/ZnS QDs and functionalized their surfaces with polymerizable groups to enable reactivity.By precisely tuning the photonic bandgap of the chiral liquid crystal polymers,we achieved chiral parented templates with high chiroptical activity overlapping full-visible-spectrum.Through covalent crosslinking with the QDs,a polymer network was formed,resulting in a maximum glum of 1.0.This polymerization-with-assembly approach offers exceptionally flexible and precise control over both the composition and architecture of superhelical materials,paving the way for high-quality CPL materials with broad applications in advanced technologies.
