松材线虫病的传播严重威胁松林生态系统安全,也造成了不可估量的经济损失。本研究采用文献计量方法,对WOS(Web of Science)数据库和CNKI(中国知网)数据库中的文献进行分析。研究结果表明,松材线虫病的研究在1980—1990年为萌芽期,在1991...松材线虫病的传播严重威胁松林生态系统安全,也造成了不可估量的经济损失。本研究采用文献计量方法,对WOS(Web of Science)数据库和CNKI(中国知网)数据库中的文献进行分析。研究结果表明,松材线虫病的研究在1980—1990年为萌芽期,在1991—2005年为高速发展期,在2006—2021年为波动增长期,且呈现整体上逐年上升的趋势,松材线虫病研究的学科分布进一步扩大;亚洲国家在松材线虫病领域有较高的积极性,但其影响力低于欧美国家,各机构国内合作交流频繁偏低,核心作者之间未形成稳定的作者群;WOS中的研究热点集中在松材线虫病的机理方面,其突破方向是分子层面,CNKI中关于松材线虫病的研究方法和思路始终维持在常规状态,创新性不高。展开更多
What factors fundamentally determine the value of superconducting transition temperature Tc in high temperature superconductors has been the subject of intense debate.Following the establishment of an empirical law kn...What factors fundamentally determine the value of superconducting transition temperature Tc in high temperature superconductors has been the subject of intense debate.Following the establishment of an empirical law known as Homes'law,there is a growing consensus in the community that the Tc value of the cuprate superconductors is closely linked to the superfluid density(ρ_(s))of its ground state and the conductivity(σ)of its normal state.However,all the data supporting this empirical law(ρ_(s)=AσT_(c))have been obtained from the ambientpressure superconductors.In this study,we present the first high-pressure results about the connection of the quantities of ρ_(s) and σ with T_(c),through the studies on the Bi_(1.74)Pb_(0.38)Sr_(1.88)CuO_(6+δ)and Bi_(2)Sr_(2)CaCu_(2)O_(8+δ),in which the value of their high-pressure resistivity(ρ=1/σ)is achieved by adopting our newly established method,while the quantity ofρs is extracted using Homes'law.We highlight that the Tc values are strongly linked to the joint response factors of magnetic field and electric field,i.e.,ρ_(s) and σ,respectively,implying that the physics determining T_(c) is governed by the intrinsic electromagnetic fields of the system.展开更多
文摘松材线虫病的传播严重威胁松林生态系统安全,也造成了不可估量的经济损失。本研究采用文献计量方法,对WOS(Web of Science)数据库和CNKI(中国知网)数据库中的文献进行分析。研究结果表明,松材线虫病的研究在1980—1990年为萌芽期,在1991—2005年为高速发展期,在2006—2021年为波动增长期,且呈现整体上逐年上升的趋势,松材线虫病研究的学科分布进一步扩大;亚洲国家在松材线虫病领域有较高的积极性,但其影响力低于欧美国家,各机构国内合作交流频繁偏低,核心作者之间未形成稳定的作者群;WOS中的研究热点集中在松材线虫病的机理方面,其突破方向是分子层面,CNKI中关于松材线虫病的研究方法和思路始终维持在常规状态,创新性不高。
基金supported by the National Key Research and Development Program of China(Grant Nos.2021YFA1401800 and 2022YFA1403900)the National Natural Science Foundation of China(Grant Nos.U2032214,12122414,12104487,and 12004419)+1 种基金the Strategic Priority Research Program(B)of the Chinese Academy of Sciences(Grant No.XDB25000000)supported by the US Department of Energy,Office of Basic Energy Sciences(Grant No.DOE-sc0012704)。
文摘What factors fundamentally determine the value of superconducting transition temperature Tc in high temperature superconductors has been the subject of intense debate.Following the establishment of an empirical law known as Homes'law,there is a growing consensus in the community that the Tc value of the cuprate superconductors is closely linked to the superfluid density(ρ_(s))of its ground state and the conductivity(σ)of its normal state.However,all the data supporting this empirical law(ρ_(s)=AσT_(c))have been obtained from the ambientpressure superconductors.In this study,we present the first high-pressure results about the connection of the quantities of ρ_(s) and σ with T_(c),through the studies on the Bi_(1.74)Pb_(0.38)Sr_(1.88)CuO_(6+δ)and Bi_(2)Sr_(2)CaCu_(2)O_(8+δ),in which the value of their high-pressure resistivity(ρ=1/σ)is achieved by adopting our newly established method,while the quantity ofρs is extracted using Homes'law.We highlight that the Tc values are strongly linked to the joint response factors of magnetic field and electric field,i.e.,ρ_(s) and σ,respectively,implying that the physics determining T_(c) is governed by the intrinsic electromagnetic fields of the system.
