As the core carrier of Lingnan culture and a nationally famous historical&cultural city,Guangzhou preserves more than 3000 immovable historic buildings,including arcade rows,ancestral halls,Xiguan mansions and mod...As the core carrier of Lingnan culture and a nationally famous historical&cultural city,Guangzhou preserves more than 3000 immovable historic buildings,including arcade rows,ancestral halls,Xiguan mansions and modern public edifices.Their brick-timber hybrid structures,high-density“bambootube”street pattern and hot-humid subtropical climate create unique fire challenges.This study systematically summarizes an“inherent-acquired-environmental”superimposed fire-risk mechanism.By integrating traditional Cantonese fire-resistance wisdom—such as Qingyun fire lanes,wok-ear gables and courtyard smoke vents—and heritage-friendly innovations,a three-level policy-technology-management protection framework is established.Hierarchical protection aligned with value grading,life-cycle technology pathways and multistakeholder collaboration is proposed.The“minimum-intervention and performance-based”route and the“regulation-guideline-standard”policy loop developed by Guangzhou reduce the fire incidence of priority historic buildings while retaining heritage authenticity,offering a replicable paradigm for balancing fire safety and conservation in hot-humid,high-density contexts.展开更多
Millisecond isomers were recently observed in ^(213,215)Tl.These two isomers can be interpreted by the π 0h 11/2- single-proton-hole states.The 11/2−states in Tl isotopes decrease in energy when neutrons are added to...Millisecond isomers were recently observed in ^(213,215)Tl.These two isomers can be interpreted by the π 0h 11/2- single-proton-hole states.The 11/2−states in Tl isotopes decrease in energy when neutrons are added to the ν0g_(9/2) orbital,as driven by the protonneutron monopole interaction.Based on the mechanism,this work investigates the isomerism in the southeastern vicinity of ^(208)Pb with an optimized shell-model effective Hamiltonian.The 11/2−isomericγ-decay half-lives are predicted to be longer in more neutron-rich nuclei,potentially exceeding theβ-decay half-lives.In this way,βdecay may predominantly occur in the 11/2−states,which are crucial for understanding the N=126 waiting points and the A=195 peak.展开更多
基金supported by Guangzhou Railway Polytechnic(No.GTXYRC 250107)Guangzhou Municipal Education Bureau(No.2025YBJG010).
文摘As the core carrier of Lingnan culture and a nationally famous historical&cultural city,Guangzhou preserves more than 3000 immovable historic buildings,including arcade rows,ancestral halls,Xiguan mansions and modern public edifices.Their brick-timber hybrid structures,high-density“bambootube”street pattern and hot-humid subtropical climate create unique fire challenges.This study systematically summarizes an“inherent-acquired-environmental”superimposed fire-risk mechanism.By integrating traditional Cantonese fire-resistance wisdom—such as Qingyun fire lanes,wok-ear gables and courtyard smoke vents—and heritage-friendly innovations,a three-level policy-technology-management protection framework is established.Hierarchical protection aligned with value grading,life-cycle technology pathways and multistakeholder collaboration is proposed.The“minimum-intervention and performance-based”route and the“regulation-guideline-standard”policy loop developed by Guangzhou reduce the fire incidence of priority historic buildings while retaining heritage authenticity,offering a replicable paradigm for balancing fire safety and conservation in hot-humid,high-density contexts.
基金supported by the Guangdong Major Project of Basic and Applied Basic Research (Grant No. 2021B0301030006)the National Natural Science Foundation of China (Grant Nos. 12475129, 12405144, and 12305129)+2 种基金the International Atomic Energy Agency Coordinatated Research Project F41034 (Grant No. 28649)the Computational Resources from Sun Yat-sen University and Fudan Universitythe National Supercomputer Center in Guangzhou
文摘Millisecond isomers were recently observed in ^(213,215)Tl.These two isomers can be interpreted by the π 0h 11/2- single-proton-hole states.The 11/2−states in Tl isotopes decrease in energy when neutrons are added to the ν0g_(9/2) orbital,as driven by the protonneutron monopole interaction.Based on the mechanism,this work investigates the isomerism in the southeastern vicinity of ^(208)Pb with an optimized shell-model effective Hamiltonian.The 11/2−isomericγ-decay half-lives are predicted to be longer in more neutron-rich nuclei,potentially exceeding theβ-decay half-lives.In this way,βdecay may predominantly occur in the 11/2−states,which are crucial for understanding the N=126 waiting points and the A=195 peak.
