Lithium metal batteries(LMBs)have recently been revitalized as one of the most promising electrochemical energy storage systems,owing to the ultrahigh specific capacity(3860 mAh g^(-1))and ultralow potential(-3.04 V v...Lithium metal batteries(LMBs)have recently been revitalized as one of the most promising electrochemical energy storage systems,owing to the ultrahigh specific capacity(3860 mAh g^(-1))and ultralow potential(-3.04 V vs.standard hydrogen electrode)of lithium metal anodes.However,safety hazards originating from lithium dendrite growth and pulverization during cycling and thermal stimulation present significant challenges to the practical application of LMBs.To address this issue,we have developed an in situ polymer electrolyte with thermally induced interfacial ion-blocking ability.We demonstrate that the repolymerization and deposition of residual vinylene carbonate in the as-prepared electrolyte under thermal abuse predominantly results in thermally induced ion blocking at the solid electrolyte interface,thus achieving superior LMB safety.The developed polymer electrolyte also yields superior cyclability in LMBs.This design philosophy provides a good paradigm for improving the safety of LMBs.展开更多
Lithium-sulfur(Li-S) batteries have been considered as one of the most promising candidates to traditional lithium ion batteries due to its low cost,high theoretical specific capacity(1675 mAh g^(-1)) and energy densi...Lithium-sulfur(Li-S) batteries have been considered as one of the most promising candidates to traditional lithium ion batteries due to its low cost,high theoretical specific capacity(1675 mAh g^(-1)) and energy density(2600 Wh kg^(-1)) of sulfur.Compared with traditional liquid electrolytes,polymer electrolytes(PEs) are ever-increasingly preferred due to their higher safety,superior compatibility,long cycling stability and so on.Despite some progresses on PEs,however,there remain lots of hurdles to be addressed prior to commercial applications.This review begins with native advantages for PEs to replace LEs,and then proposes the ideal requirements for PEs.Furthermore,a brief development history of typical PEs for Li-S batteries is presented to systematically summarize the recent achievements in Li-S batteries with PEs.Noted that the structure-performance relationships of polymer matrixes for PEs are highlighted.Finally,the challenges and opportunities on the future development of PEs are presented.We hold the view that composite polymer electrolytes in virtue of the high ionic conductivity and the compatible interfacial property will be promising solution for high performance Li-S batteries.展开更多
目的对比肝神经内分泌肿瘤(HNEN)和肝细胞癌(HCC)的超声影像学特征,探讨超声在二者鉴别诊断中的临床应用价值。方法回顾性分析2009年9月至2020年12月于复旦大学附属中山医院病理诊断为HNEN的40例患者的常规超声及超声造影声像图特征,并...目的对比肝神经内分泌肿瘤(HNEN)和肝细胞癌(HCC)的超声影像学特征,探讨超声在二者鉴别诊断中的临床应用价值。方法回顾性分析2009年9月至2020年12月于复旦大学附属中山医院病理诊断为HNEN的40例患者的常规超声及超声造影声像图特征,并随机选取同时期40例病理诊断为HCC患者的常规超声及超声造影声像图作为对照;常规超声的观察指标包括病灶的数目、边界、回声水平、动脉血流信号检出率等;超声造影的观察指标包括病灶的增强时间、增强方式、峰值表现、门脉期及延迟期表现等。分析比较2组病灶上述超声影像学特征:采用独立样本t检验或Mann-Whitney U检验比较2组间超声造影的增强开始时间、达峰时间及消退时间的差异;采用χ^(2)检验或精确概率检验比较2组间病灶数目、边界、回声水平、动脉血流信号检出率的差异。结果肿瘤数目、增强的消退时间、增强方式、峰值表现、门脉期及延迟期表现在HNEN和HCC之间差异具有统计学意义(P<0.05)。与HCC相比,HNEN更多表现为多发病灶(27/40 vs 5/40,P<0.001)。超声造影上,HNEN增强消退时间早于HCC[40.0(33.0,49.3)s vs 67.0(48.8,120.0)s],差异具有统计学意义(Z=4.592,P=0.001);HNEN以向心性增强方式增强、峰值时表现为环形强化、门脉期及延迟期表现为明显减退的比例高于HCC(8/40 vs 0/40,P=0.005;5/40 vs 0/40,P=0.048;29/40 vs 9/40,P<0.001;36/40 vs 22/40,P=0.002)。结论HNEN和HCC具有不同的超声影像学特征,超声对二者的鉴别诊断有一定帮助。展开更多
The electronic structures and optical properties of the monoclinic ZrO2 (m-ZrO2) are investigated by means of first-principles local density approximation (LDA) + U approach.Without on-site Coulomb interactions,the ba...The electronic structures and optical properties of the monoclinic ZrO2 (m-ZrO2) are investigated by means of first-principles local density approximation (LDA) + U approach.Without on-site Coulomb interactions,the band gap of m-ZrO2 is 3.60 eV,much lower than the experimental value (5.8 eV).By introducing the Coulomb interactions of 4d orbitals on Zr atom (Ud) and of 2p orbitals on O atom (Up),we can reproduce the experimental value of the band gap.The calculated dielectric function of m-ZrO2 exhibits a small shoulder at the edge of the band gap in its imaginary part,while in the tetragonal ZrO2 and cubic ZrO2 it is absent,which is consistent with the experimental observations.The origin of the shoulder is attributed to the difference of electronic structures near the edge of the valence and conduction bands.展开更多
We discuss a general interaction quench in a Luttinger liquid described by a paired bosonic Hamiltonian.By employing su(1,1)Lie algebra,the post-quench time-evolved wavefunctions are obtained analytically,from which t...We discuss a general interaction quench in a Luttinger liquid described by a paired bosonic Hamiltonian.By employing su(1,1)Lie algebra,the post-quench time-evolved wavefunctions are obtained analytically,from which the time evolution of the entanglement in momentum space can be investigated.We note that depending on the choice of Bogoliubov quasiparticles,the expressions of wavefunctions,which describe time-evolved paired states,can take different forms.The correspondence between the largest entanglement eigenvalue in momentum space and the wavefunction overlap in quench dynamics is discussed,which generalizes the results of Dora et al(2016,Phys.Rev.Lett.117,010603).A numerical demonstration on an XXZ lattice model is presented via the exact diagonalization method.展开更多
Hydrogels formed by gelators have attracted growing attention for their promising application in biomaterials and biotechnology, We describe in this paper the generation and characterization of a novel photo-, thermal...Hydrogels formed by gelators have attracted growing attention for their promising application in biomaterials and biotechnology, We describe in this paper the generation and characterization of a novel photo-, thermal- and pH-responsive hydrogel based on an amino acid gelator AA-Azo-EG6. Specifically, the gelator bears an amino acid head, an azobenzene （Azo） linker, and a short oligoethylene glycol tail （EG6）. The resulting AA-Azo-EG6 hydrogel is injectable and exhibits interesting helical self-assembled structures, Meanwhile, the hydrogel is able to experience a gel-sol or gel-precipitate phase transition responding to external stimuli. Thus, this AA-Azo-EG6 gelator is a promising building block for intelligent materials and drug delivery.展开更多
目的探讨经桡动脉入路脑血管造影中持续动脉压监测在发现导管扭转打结中的作用。方法回顾性分析2017年7月至2019年12月接受经桡动脉入路脑血管造影的116例缺血性脑血管病患者的临床病例资料,其中80例造影过程中接受持续动脉压监测(测压...目的探讨经桡动脉入路脑血管造影中持续动脉压监测在发现导管扭转打结中的作用。方法回顾性分析2017年7月至2019年12月接受经桡动脉入路脑血管造影的116例缺血性脑血管病患者的临床病例资料,其中80例造影过程中接受持续动脉压监测(测压组),另36例作为无测压组。在操作过程中,动脉压力差变小甚至曲线变平提示导管某段发生扭转打结。比较两组患者的性别、年龄、主动脉弓型等基本临床病例信息,手术适应证、透视时间、手术时间,以及造影过程中导管扭转打结发生率。结果两组患者性别、年龄、主动脉弓型、透视时间、手术时间差异均无统计学意义。测压组动脉导管扭转打结发生率低于无测压组(0 vs 8.33%,P=0.047)。结论持续动脉压力监测有助于发现早期桡动脉入路脑血管造影过程中导管扭转打结,进而降低相关并发症的发生,值得推广应用。展开更多
基金supported by the National Key R&D Pro-gram of China(Grant No.2021YFC2800201)the NSFC-Shandong Joint Fund(U1706229)+2 种基金the Science Foundation for the Strategic Priority Research Program of the Chinese Academy of Sciences(XDA22010603)the National Natural Science Foundation of China(51803230)the Natural Science Foundation of Shandong Province(No.ZR2020QE089).
文摘Lithium metal batteries(LMBs)have recently been revitalized as one of the most promising electrochemical energy storage systems,owing to the ultrahigh specific capacity(3860 mAh g^(-1))and ultralow potential(-3.04 V vs.standard hydrogen electrode)of lithium metal anodes.However,safety hazards originating from lithium dendrite growth and pulverization during cycling and thermal stimulation present significant challenges to the practical application of LMBs.To address this issue,we have developed an in situ polymer electrolyte with thermally induced interfacial ion-blocking ability.We demonstrate that the repolymerization and deposition of residual vinylene carbonate in the as-prepared electrolyte under thermal abuse predominantly results in thermally induced ion blocking at the solid electrolyte interface,thus achieving superior LMB safety.The developed polymer electrolyte also yields superior cyclability in LMBs.This design philosophy provides a good paradigm for improving the safety of LMBs.
基金financially supported by the National Key R&D Program of China(2017YFE0127600)the Science Foundation for the Strategic Priority Research Program of the Chinese Academy of Sciences(XDA22010600)+3 种基金the Key-Area Research and Development Program of Guangdong Province(2020B090919005)the Distinguished Young Scholars of China(51625204)the National Natural Science Foundation of China(U1706229,51803230)support by the DICP&QIBEBT(DICP&QIBEBT UN201707)。
文摘Lithium-sulfur(Li-S) batteries have been considered as one of the most promising candidates to traditional lithium ion batteries due to its low cost,high theoretical specific capacity(1675 mAh g^(-1)) and energy density(2600 Wh kg^(-1)) of sulfur.Compared with traditional liquid electrolytes,polymer electrolytes(PEs) are ever-increasingly preferred due to their higher safety,superior compatibility,long cycling stability and so on.Despite some progresses on PEs,however,there remain lots of hurdles to be addressed prior to commercial applications.This review begins with native advantages for PEs to replace LEs,and then proposes the ideal requirements for PEs.Furthermore,a brief development history of typical PEs for Li-S batteries is presented to systematically summarize the recent achievements in Li-S batteries with PEs.Noted that the structure-performance relationships of polymer matrixes for PEs are highlighted.Finally,the challenges and opportunities on the future development of PEs are presented.We hold the view that composite polymer electrolytes in virtue of the high ionic conductivity and the compatible interfacial property will be promising solution for high performance Li-S batteries.
文摘目的对比肝神经内分泌肿瘤(HNEN)和肝细胞癌(HCC)的超声影像学特征,探讨超声在二者鉴别诊断中的临床应用价值。方法回顾性分析2009年9月至2020年12月于复旦大学附属中山医院病理诊断为HNEN的40例患者的常规超声及超声造影声像图特征,并随机选取同时期40例病理诊断为HCC患者的常规超声及超声造影声像图作为对照;常规超声的观察指标包括病灶的数目、边界、回声水平、动脉血流信号检出率等;超声造影的观察指标包括病灶的增强时间、增强方式、峰值表现、门脉期及延迟期表现等。分析比较2组病灶上述超声影像学特征:采用独立样本t检验或Mann-Whitney U检验比较2组间超声造影的增强开始时间、达峰时间及消退时间的差异;采用χ^(2)检验或精确概率检验比较2组间病灶数目、边界、回声水平、动脉血流信号检出率的差异。结果肿瘤数目、增强的消退时间、增强方式、峰值表现、门脉期及延迟期表现在HNEN和HCC之间差异具有统计学意义(P<0.05)。与HCC相比,HNEN更多表现为多发病灶(27/40 vs 5/40,P<0.001)。超声造影上,HNEN增强消退时间早于HCC[40.0(33.0,49.3)s vs 67.0(48.8,120.0)s],差异具有统计学意义(Z=4.592,P=0.001);HNEN以向心性增强方式增强、峰值时表现为环形强化、门脉期及延迟期表现为明显减退的比例高于HCC(8/40 vs 0/40,P=0.005;5/40 vs 0/40,P=0.048;29/40 vs 9/40,P<0.001;36/40 vs 22/40,P=0.002)。结论HNEN和HCC具有不同的超声影像学特征,超声对二者的鉴别诊断有一定帮助。
基金the National Natural Science Foundation of China，the Strategic Programs for Innovative Research，the Computational Materials Science Initiative，the Yukawa International Program for Quark-Hadron Sciences at YITP,Kyoto University
文摘The electronic structures and optical properties of the monoclinic ZrO2 (m-ZrO2) are investigated by means of first-principles local density approximation (LDA) + U approach.Without on-site Coulomb interactions,the band gap of m-ZrO2 is 3.60 eV,much lower than the experimental value (5.8 eV).By introducing the Coulomb interactions of 4d orbitals on Zr atom (Ud) and of 2p orbitals on O atom (Up),we can reproduce the experimental value of the band gap.The calculated dielectric function of m-ZrO2 exhibits a small shoulder at the edge of the band gap in its imaginary part,while in the tetragonal ZrO2 and cubic ZrO2 it is absent,which is consistent with the experimental observations.The origin of the shoulder is attributed to the difference of electronic structures near the edge of the valence and conduction bands.
基金H.L.acknowledges support from the National Natural Science Foundation of China(Grant Nos.11474136,11874187 and 12047501).
文摘We discuss a general interaction quench in a Luttinger liquid described by a paired bosonic Hamiltonian.By employing su(1,1)Lie algebra,the post-quench time-evolved wavefunctions are obtained analytically,from which the time evolution of the entanglement in momentum space can be investigated.We note that depending on the choice of Bogoliubov quasiparticles,the expressions of wavefunctions,which describe time-evolved paired states,can take different forms.The correspondence between the largest entanglement eigenvalue in momentum space and the wavefunction overlap in quench dynamics is discussed,which generalizes the results of Dora et al(2016,Phys.Rev.Lett.117,010603).A numerical demonstration on an XXZ lattice model is presented via the exact diagonalization method.
基金supported by [18_TD$IF]State High-Tech Development Program of China (863 Program, No. 2015AA020941)the National Natural Science Foundation of China(Nos. NSFC21474004 and NSFC21434008)the Youth Thousand-Talents Program of China for support
文摘Hydrogels formed by gelators have attracted growing attention for their promising application in biomaterials and biotechnology, We describe in this paper the generation and characterization of a novel photo-, thermal- and pH-responsive hydrogel based on an amino acid gelator AA-Azo-EG6. Specifically, the gelator bears an amino acid head, an azobenzene （Azo） linker, and a short oligoethylene glycol tail （EG6）. The resulting AA-Azo-EG6 hydrogel is injectable and exhibits interesting helical self-assembled structures, Meanwhile, the hydrogel is able to experience a gel-sol or gel-precipitate phase transition responding to external stimuli. Thus, this AA-Azo-EG6 gelator is a promising building block for intelligent materials and drug delivery.
文摘目的探讨经桡动脉入路脑血管造影中持续动脉压监测在发现导管扭转打结中的作用。方法回顾性分析2017年7月至2019年12月接受经桡动脉入路脑血管造影的116例缺血性脑血管病患者的临床病例资料,其中80例造影过程中接受持续动脉压监测(测压组),另36例作为无测压组。在操作过程中,动脉压力差变小甚至曲线变平提示导管某段发生扭转打结。比较两组患者的性别、年龄、主动脉弓型等基本临床病例信息,手术适应证、透视时间、手术时间,以及造影过程中导管扭转打结发生率。结果两组患者性别、年龄、主动脉弓型、透视时间、手术时间差异均无统计学意义。测压组动脉导管扭转打结发生率低于无测压组(0 vs 8.33%,P=0.047)。结论持续动脉压力监测有助于发现早期桡动脉入路脑血管造影过程中导管扭转打结,进而降低相关并发症的发生,值得推广应用。
