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
采用岩心驱替实验模拟油藏中原油乳化过程,通过可视岩心驱替实验研究乳状液形成机理,分析不同运移距离、乳化剂浓度和注入速度下形成乳状液的粒径分布及孔喉级别乳状液形成条件,通过测量形成的乳状液黏度、储能模量和耗能模量,研究乳状...采用岩心驱替实验模拟油藏中原油乳化过程,通过可视岩心驱替实验研究乳状液形成机理,分析不同运移距离、乳化剂浓度和注入速度下形成乳状液的粒径分布及孔喉级别乳状液形成条件,通过测量形成的乳状液黏度、储能模量和耗能模量,研究乳状液的黏弹性。研究表明:多孔介质中乳状液形成机理主要为残余油卡断作用和乳化剂溶液的剪切作用。当运移距离大于1/3倍注采井距、乳化剂浓度为0.4%~0.5%、注入速度为0.3~0.4 m L/min时,能够形成稳定性较好的孔喉级别乳状液。当乳化剂浓度为0.4%和0.5%、剪切速度为7.34 s-1时,乳状液黏度可达48.6~70.3 m Pa·s。随着乳化剂浓度的增加,乳状液的储能模量和耗能模量增大,乳状液黏弹性增强。展开更多
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.
文摘采用岩心驱替实验模拟油藏中原油乳化过程,通过可视岩心驱替实验研究乳状液形成机理,分析不同运移距离、乳化剂浓度和注入速度下形成乳状液的粒径分布及孔喉级别乳状液形成条件,通过测量形成的乳状液黏度、储能模量和耗能模量,研究乳状液的黏弹性。研究表明:多孔介质中乳状液形成机理主要为残余油卡断作用和乳化剂溶液的剪切作用。当运移距离大于1/3倍注采井距、乳化剂浓度为0.4%~0.5%、注入速度为0.3~0.4 m L/min时,能够形成稳定性较好的孔喉级别乳状液。当乳化剂浓度为0.4%和0.5%、剪切速度为7.34 s-1时,乳状液黏度可达48.6~70.3 m Pa·s。随着乳化剂浓度的增加,乳状液的储能模量和耗能模量增大,乳状液黏弹性增强。
