With the continuous advancement of the country’s urbanization process,many cities are simultaneously carrying out the renovation of old urban areas while building new urban areas,which involves the demolition of many...With the continuous advancement of the country’s urbanization process,many cities are simultaneously carrying out the renovation of old urban areas while building new urban areas,which involves the demolition of many buildings and municipal infrastructures.To ensure the smooth progress of demolition projects,related safety management work is crucial.This article will discuss the safety management measures for demolition projects based on the basic principles of safety management for municipal infrastructure demolition projects,taking the demolition of gas storage tanks as an example.展开更多
Metal-organic-frameworks(MOFs)derived carbon-based composites with balanced impedance matching and synergistic dielectric/magnetic loss are considered as promising microwave absorbers.With the aim to promote interfaci...Metal-organic-frameworks(MOFs)derived carbon-based composites with balanced impedance matching and synergistic dielectric/magnetic loss are considered as promising microwave absorbers.With the aim to promote interfacial polarization,herein,heterogeneous junctions composed of magnetic Ni core and binary dielectric shells(C and PEDOT)are synthesized by annealing Ni-MOFs precursors and an in-situ polymerization strategy,forming Ni@C@PEDOT spheres with multilayer heterogeneous interfaces.The results indicate that the final absorption attenuation is sensitive to the thickness of the dielectric PEDOT layer,when the thickness of the PEDOT layer is 224 nm,an optimal reflection loss of-72.4 d B is achieved at 2 mm and the effective absorption bandwidth reaches 6.4 GHz with a thickness of only 1.85 mm,the excellent absorption attenuation is accredited to the promoted impedance matching,enhanced conduction loss as well as the synergistic interfacial polarization induced by magnetic core and binary dielectric shells.Meanwhile,this work offers a simple and significant strategy in preparation for ideal microwave absorbers by rational design of multilayer heterogeneous interfaces.展开更多
Hyperthermophilic composting(HC)represents a promising approach for converting organic solid waste into valuable resources by leveraging extreme temperatures to enhance microbial degradation and detoxification process...Hyperthermophilic composting(HC)represents a promising approach for converting organic solid waste into valuable resources by leveraging extreme temperatures to enhance microbial degradation and detoxification processes.In this high-temperature environment,microbial communities undergo dynamic succession,where thermophilic bacteria dominate and drive efficient organic matter transformation through adapted metabolic pathways and stress responses.These adaptations include the stabilization of cellular structures and enzymes,often mediated by heat shock proteins(HSPs)that prevent protein misfolding under thermal stress.However,the integrated mechanisms linking community-level functional shifts to molecular-level protein remodeling in thermophiles during HC remain poorly understood.Here we show a coordinated interaction of functional succession and molecular adaptations within thermophilic bacteria in HC,which collectively achieve heat resistance.This interaction encompasses enhanced metabolic and genetic modules,accounting for 97%of the variance observed in thermophile abundance.Metagenomic analyses revealed upregulation of translation,transcription,amino acid metabolism,and cell wall biosynthesis,coupled with suppression of mobilome functions to maintain genomic stability,as confirmed by partial least squares path modeling and Boruta analyses.Molecular dynamics simulations of key enzymes from the thermophile Truepera further demonstrated intrinsic structural rigidity,reduced hydrophobic exposure,and hierarchical chaperone activity involving DNAJ,DNAK,and GroEL for protein repair.These findings enhance our comprehension of microbial thermotolerance and establish a foundation for optimizing composting efficiency and advancing heat-resistant microbial applications in biotechnology and waste management.Additionally,they offer insights into the evolution of thermophiles,protein engineering,and stress adaptation across various biological and industrial systems,thereby promoting the integration of environmental engineering and systems biology.展开更多
文摘With the continuous advancement of the country’s urbanization process,many cities are simultaneously carrying out the renovation of old urban areas while building new urban areas,which involves the demolition of many buildings and municipal infrastructures.To ensure the smooth progress of demolition projects,related safety management work is crucial.This article will discuss the safety management measures for demolition projects based on the basic principles of safety management for municipal infrastructure demolition projects,taking the demolition of gas storage tanks as an example.
基金the Shanghai Key Laboratory of R&D for Metallic Functional Materials(2021-01)。
文摘Metal-organic-frameworks(MOFs)derived carbon-based composites with balanced impedance matching and synergistic dielectric/magnetic loss are considered as promising microwave absorbers.With the aim to promote interfacial polarization,herein,heterogeneous junctions composed of magnetic Ni core and binary dielectric shells(C and PEDOT)are synthesized by annealing Ni-MOFs precursors and an in-situ polymerization strategy,forming Ni@C@PEDOT spheres with multilayer heterogeneous interfaces.The results indicate that the final absorption attenuation is sensitive to the thickness of the dielectric PEDOT layer,when the thickness of the PEDOT layer is 224 nm,an optimal reflection loss of-72.4 d B is achieved at 2 mm and the effective absorption bandwidth reaches 6.4 GHz with a thickness of only 1.85 mm,the excellent absorption attenuation is accredited to the promoted impedance matching,enhanced conduction loss as well as the synergistic interfacial polarization induced by magnetic core and binary dielectric shells.Meanwhile,this work offers a simple and significant strategy in preparation for ideal microwave absorbers by rational design of multilayer heterogeneous interfaces.
基金supported by the National Key Research and Development Program of China(No.2020YFC1806402)the Shenyang Science and Technology Plan Project(No.20-202-4-37).
文摘Hyperthermophilic composting(HC)represents a promising approach for converting organic solid waste into valuable resources by leveraging extreme temperatures to enhance microbial degradation and detoxification processes.In this high-temperature environment,microbial communities undergo dynamic succession,where thermophilic bacteria dominate and drive efficient organic matter transformation through adapted metabolic pathways and stress responses.These adaptations include the stabilization of cellular structures and enzymes,often mediated by heat shock proteins(HSPs)that prevent protein misfolding under thermal stress.However,the integrated mechanisms linking community-level functional shifts to molecular-level protein remodeling in thermophiles during HC remain poorly understood.Here we show a coordinated interaction of functional succession and molecular adaptations within thermophilic bacteria in HC,which collectively achieve heat resistance.This interaction encompasses enhanced metabolic and genetic modules,accounting for 97%of the variance observed in thermophile abundance.Metagenomic analyses revealed upregulation of translation,transcription,amino acid metabolism,and cell wall biosynthesis,coupled with suppression of mobilome functions to maintain genomic stability,as confirmed by partial least squares path modeling and Boruta analyses.Molecular dynamics simulations of key enzymes from the thermophile Truepera further demonstrated intrinsic structural rigidity,reduced hydrophobic exposure,and hierarchical chaperone activity involving DNAJ,DNAK,and GroEL for protein repair.These findings enhance our comprehension of microbial thermotolerance and establish a foundation for optimizing composting efficiency and advancing heat-resistant microbial applications in biotechnology and waste management.Additionally,they offer insights into the evolution of thermophiles,protein engineering,and stress adaptation across various biological and industrial systems,thereby promoting the integration of environmental engineering and systems biology.
