检索结果-南通市图书馆

On the topological surface states of the intrinsic magnetic topological insulator Mn-Bi-Te family

在线全文

学校读者我要写书评

暂无评论

National Science Review 2024年第2期11卷 50-64页

作者： Yuan Wang Xiao-Ming Ma Zhanyang Hao yongqing cai Hongtao Rong Fayuan Zhang Weizhao Chen Chengcheng Zhang Junhao Lin Yue Zhao Chang Liu Qihang Liu Chaoyu Chen Shenzhen Institute for Quantum Science and Engineering(SIQSE)and Department of Physics Southern University of Science and Technology(SUSTech)

We review recent progress in the electronic structure study of intrinsic magnetic topological insulators（MnBi2Te4）·（Bi2Te3）n（n = 0, 1, 2, 3） family. Specifically, we focus on the ubiquitously（nearly）gapless behavior of the topological Dirac surface state observed by photoemission spectroscopy, even though a large Dirac gap is expected because of surface ferromagnetic order. The dichotomy between experiment and theory concerning this gap behavior is perhaps the most critical and puzzling question in this frontier. We discuss various proposals accounting for the lack of magnetic effect on the topological Dirac surface state, which are mainly categorized into two pictures, magnetic reconfiguration and topological surface state redistribution. Band engineering towards opening a magnetic gap of topological surface states provides great opportunities to realize quantized topological transport and axion electrodynamics at higher temperatures.

关键词： intrinsic magnetic topological insulator topological surface states magnetic gap magnetic reconfiguration topological surface state redistribution van der Waals spacing expansion

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

数值分析力矩比对尖牙平移移动的影响

医用生物力学 2020年第5期35卷 449-454页

作者：蔡永清海南大学机电工程学院海口570100

目的通过有限元方法分析不同大小力矩比(M/F)和力对尖牙位移、牙周膜应力的影响。方法根据临床CT图像构建三维下颌模型,应用只有矫治力和有不同M/F矫治力系统对尖牙进行平移移动的模拟计算。分析在每一种情况下尖牙的位移平移情况,并推... 详细信息

目的通过有限元方法分析不同大小力矩比(M/F)和力对尖牙位移、牙周膜应力的影响。方法根据临床CT图像构建三维下颌模型,应用只有矫治力和有不同M/F矫治力系统对尖牙进行平移移动的模拟计算。分析在每一种情况下尖牙的位移平移情况,并推导出最优的能实现尖牙平移的矫治力系统。结果在所有计算中牙周膜应力均随力增大而增大。牙周膜应力则先随M/F增加而减小,达到一定值M/F=10.1 mm后(最优M/F)随M/F增加而增大。尖牙的初始位移都是倾斜移动,当采用精确的最优M/F时,尖牙的初始位移最接近平移移动。结论尖牙移动需要适合的力值,防止牙根吸收,然而平移移动需要有最佳的M/F,且是必须在生理适合力范围内的M/F。了解力和力矩对牙齿平移的影响有助于施加更加合理的矫治力系和设计更加合理的正畸器械装置。

关键词：力矩比尖牙平移移动矫治力

Therapeutic effect of hyperoside on rats with TNBS-induced ulcerative colitis by regulating autophagy

在线全文

学校读者我要写书评

暂无评论

Therapeutic effect of hyperoside on rats with TNBS-induced u...

Electronic structure of exfoliated millimeter-sized monolayer WSe2 on silicon wafer

中国药理学会化疗药理专业委员会第十五届学术大会暨2018重庆化疗药物基础与前沿国际论坛

作者： yongqing cai Xiaoli Li Jianhong Chen Department of Pharmacy Institute of Surgery ResearchDaping HospitalThird Military Medical University College of Pharmacy Chongqing Medical University

This study investigated the therapeutic effect and the underlying mechanism of hyperoside on rats with ulcerative colitis(UC) induced by 2,4,6-trinitr-obenzene sulfonic acid(TNBS).Our study demonstrated that hyperoside significantly improveded colon weight/length ratio,attenuated macroscopic and histopathological scores,reduced colon levels of IL-1β,TNF-α,MDA and MPO,and improved SOD activities in *** addition,hyperoside significantly decreased nuclear NF-κB p65 and TRAF6 levels in colon in TNBS-induced ***,hyperoside inhibited the apoptosis,and the expression of LC3,Beclinl and p62 in TNBS-induced *** conclusion,hyperoside improves TNBS-induced ulcerative colitis in association with restoration of autophagy flux to promote autophagic degradation of TRAF6 to suppress inflammation and oxidative *** findings may offer new therapeutic interventions for UC.

关键词： hyperoside ulcerative colitis autophagy flux anti-inflammatory antiox

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Nano Research 2019年第12期12卷 3095-3100页

作者： Wenjuan Zhao Yuan Huang Cheng Shen Cong Li yongqing cai Yu Xu Hongtao Rong Qiang Gao Yang Wang Lin Zhao Lihong Bao Qingyan Wang Guangyu Zhang Hongjun Gao Zuyan Xu Xingjiang Zhou Guodong Liu Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Technical Institute of Physics and Chemistry Chinese Academy of SciencesBeijing 100190China Songshan Lake Materials Laboratory Dongguan 523808China Beijing Academy of Quantum Information Sciences Beijing 100193China

The mono layer WSe2 is in teresting and important for future application in nanoelectronics,spintronics and valleytronics devices,because it has the largest spin splitting and Ion gest valley coherence time among all the known monolayer transition-metal dichalcogenides(TMDs).Toobtain the large-area monolayer TMDs'crystal is the first step to manu facture scalable and high-performance electronic *** this letter,we have successfully fabricated millimeter-sized mono layer WSe2 single crystals with very high quality,based on our improved mecha nicalexfoliation *** such superior samples,using standard high resolution angle-resolved photoemission spectroscopy,we didcomprehe nsive electronic band structure measurements on our mono layer *** overall band features point it to be a 1.2 eV direct bandgap semico *** spin splitting of the valence band at K point is found as 460 meV,which is 30 meV less than the corresponding band splitting in its bulk *** effective hole masses of valence bands are determined as 2.344 me atГ,and 0.529 me as well as 0.532 meat K for the upper and lower branch of splitting ban ds,*** screening effect from substrate is shown to substa ntially impact onthe electronic *** results provide importa nt insights into band structure engineering in mono layer *** mono layer WSe2 crystals may constitute a valuable device platform.

关键词： transition-metal dichalcogenides WSe2 monolayer electronic structure angle-resolved photoemission spectroscopy

Stable Metal–Halide Perovskite Colloids in Protic Ionic Liquid

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

CCS Chemistry 2022年第10期4卷 3264-3274页

作者： Hao Gu Tingting Niu Shouwei Zuo yongqing cai Lingfeng Chao Peter Müller-Buschbaum Yingdong Xia Jing Zhang Guichuan Xing Yonghua Chen Key Laboratory of Flexible Electronics(KLOFE) Institution of Advanced Materials(IAM)Nanjing Tech University(NanjingTech)Nanjing 211816Jiangsu Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials EngineeringUniversity of MacaoTaipa 999078Macao Frontiers Science Center for Flexible Electronics Xi’an Institute of Flexible Electronics(IFE)Xi’an Institute of Biomedical Materials&EngineeringNorthwestern Polytechnical UniversityXi’an 710072 Beijing Synchrotron Radiation Facility Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049 University of Chinese Academy of Sciences Beijing 100049 Lehrstuhl für Funktionelle Materialien Physik DepartmentTechnische Universität MünchenGarching 85748 Heinz Maier-Leibnitz Zentrum(MLZ) Technische Universität MünchenGarching 85748

Obtaining long-term stable and robust perovskite colloids solution remains an important scientific challenge due to the limited interaction between solvent and perovskite ***,we unveil the formation mechanism of chemically robust perovskite precursor solutions under ambient conditions using methylammonium acetate(CH3NH3•CH3COO,MAAc)protic ionic liquid(PIL)*** of nanometers colloids are assembled on the molecular level via regular oriented gel-like lamellae with a mean thickness of 34.69 nm,width of 56.81 nm,and distance of 91.05 nm.

关键词： perovskite colloids protic ionic liquid X-ray absorption fine structure spectroscopy coordination interaction

Nanoscale phase management of the 2D/3D heterostructure toward efficient perovskite solar cells

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science Bulletin 2024年第18期69卷 2853-2861页

作者： Hao Gu Annan Zhu Junmin Xia Wang Li Jiahao Zheng Tao Yang Shengwen Li Nan Zhang Shiliang Mei yongqing cai Shi Chen Chao Liang Guichuan Xing Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials EngineeringUniversity of MacaoMacao 999078China State Key Laboratory of Organic Electronics and Information Displays&Institute of Advanced Materials(IAM) Jiangsu National Synergetic Innovation Center for Advanced Materials(SICAM)Nanjing University of Posts&Telecommunications(NUPT)Nanjing 210023China MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter School of PhysicsNational Innovation Platform(Center)for Industry-Education Integration of Energy Storage TechnologyXi’an Jiaotong UniversityXi’an 710049China Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System Guangdong Provincial Key Laboratory of Semiconductor Optoelectronic Materials and Intelligent Photonic SystemsHarbin Institute of TechnologyShenzhen 518055China Institute for Electric Light Sources School of Information Science and TechnologyFudan UniversityShanghai 200433China

The stabilization of the formamidinium lead iodide(FAPbI_(3))structure is pivotal for the development of efficient photovoltaic *** two-dimensional(2D)layers to passivate the threedimensional(3D)perovskite is essential for maintaining the a-phase of FAPbI_(3) and enhancing the power conversion efficiency(PCE)of perovskite solar cells(PSCs).However,the role of bulky ligands in the phase management of 2D perovskites,crucial for the stabilization of FAPbI_(3),has not yet been *** this study,we synthesized nanoscale 2D perovskite capping crusts with=1 and 2 Ruddlesden-Popper(RP)perovskite layers,respectively,which form a type-Ⅱ 2D/3D *** heterostructure stabilizes the a-phase of FAPbI_(3),and facilitates ultrafast carrier extraction from the 3D perovskite network to transport contact *** introduced tri-fluorinated ligands to mitigate defects caused by the halide vacancies and uncoordinated Pb^(2+)ions,thereby reducing nonradiative carrier recombination and extending carrier *** films produced were incorporated into PSCs that not only achieved a PCE of 25.39%but also maintained 95%of their initial efficiency after 2000 h of continuous light exposure without *** findings underscore the effectiveness of a phase-pure 2D/3D heterostructure-terminated film in inhibiting phase transitions passivating the iodide anion vacancy defects,facilitating the charge carrier extraction,and boosting the performance of optoelectronic devices.

关键词： Phase-pure 2D perovskite 2D/3D heterostructure Type-II energy alignment Carrier dynamic FAPbI_(3)

Unusual electronic structure of Dirac material BaMnSb_(2) revealed by angle-resolved photoemission spectroscopy

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics B 2021年第6期30卷 52-57页

作者： Hongtao Rong Liqin Zhou Junbao He Chunyao Song Yu Xu yongqing cai Cong Li Qingyan Wang Lin Zhao Guodong Liu Zuyan Xu Genfu Chen Hongming Weng Xingjiang Zhou National Laboratory for Superconductivity Beijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Henan International Joint Laboratory of MXene Materials Microstructure College of Physics and Electronic EngineeringNanyang Normal UniversityNanyang 473061China Songshan Lake Materials Laboratory Dongguan 523808China Technical Institute of Physics and Chemistry Chinese Academy of SciencesBeijing 100190China Beijing Academy of Quantum Information Sciences Beijing 100193China

High resolution angle resolved photoemission measurements and band structure calculations are carried out to study the electronic structure of BaMnSb_(2). All the observed bands are nearly linear that extend to a wide energy range. The measured Fermi surface mainly consists of one hole pocket around Γ and a strong spot at Y which are formed from the crossing points of the linear bands. The measured electronic structure of BaMnSb_(2) is unusual and deviates strongly from the band structure calculations. These results will stimulate further efforts to theoretically understand the electronic structure of BaMnSb_(2) and search for novel properties in this Dirac material.

关键词： ARPES BaMnSb_(2) Dirac material magnetic topological material

Emergence of superconductivity from fully incoherent normal state in an iron-based superconductor (Ba_(0.6)K_(0.4))Fe_2As_2

在线全文

学校读者我要写书评

暂无评论

Science Bulletin 2019年第1期64卷 11-19页

作者： Jianwei Huang Lin Zhao Cong Li Qiang Gao Jing Liu Yong Hu Yu Xu yongqing cai Dingsong Wu Ying Ding Cheng Hu Huaxue Zhou Xiaoli Dong Guodong Liu Qingyan Wang Shenjin Zhang Zhimin Wang Fengfeng Zhang Feng Yang Qinjun Peng Zuyan Xu Chuangtian Chen Xingjiang Zhou Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences University of Chinese Academy of Sciences Technical Institute of Physics and Chemistry Chinese Academy of Sciences Songshan Lake Materials Laboratory Collaborative Innovation Center of Quantum Matter

In unconventional superconductors, it is generally believed that understanding the physical properties of the normal state is a pre-requisite for understanding the superconductivity mechanism. In conventional superconductors like niobium or lead, the normal state is a Fermi liquid with a well-defined Fermi surface and well-defined quasipartcles along the Fermi surface. Superconductivity is realized in this case by the Fermi surface instability in the superconducting state and the formation and condensation of the electron pairs(Cooper pairing). The high temperature cuprate superconductors, on the other hand, represent another extreme case that superconductivity can be realized in the underdoped region where there is neither well-defined Fermi surface due to the pseudogap formation nor quasiparticles near the antinodal regions in the normal state. Here we report a novel scenario that superconductivity is realized in a system with well-defined Fermi surface but without quasiparticles along the Fermi surface in the normal *** resolution laser-based angle-resolved photoemission measurements have been performed on an optimally-doped iron-based superconductor(Ba_(0.6)K_(0.4))Fe_2As_2. We find that, while sharp superconducting coherence peaks emerge in the superconducting state on the hole-like Fermi surface sheets, no quasiparticle peak is present in the normal state. Its electronic behaviours deviate strongly from a Fermi liquid system. The superconducting gap of such a system exhibits an unusual temperature dependence that it is nearly a constant in the superconducting state and abruptly closes at Tc. These observations have provided a new platform to study unconventional superconductivity in a non-Fermi liquid system.

关键词： (Ba0.6K0.4)Fe2As2 ARPES Superconducting gap Normal state Non-Fermi liquid

EBP50和EGFR在食管癌中的表达和临床意义

在线全文

学校读者我要写书评

暂无评论

基因组学与应用生物学 2018年第12期37卷 5544-5551页

作者：蔡仁中李高蔡用清海南省人民医院

为了探讨抑癌基因磷酸化蛋白(EBP50)和表皮生长因子受体(EGFR)在食管癌中的表达及临床预后关系,本研究采用免疫组化方法检测66例食管癌及癌旁组织中EBP50和EGFR蛋白的表达。研究发现,EBP50在食管癌组织中的表达低于癌旁正常食管组织(p0.... 详细信息

为了探讨抑癌基因磷酸化蛋白(EBP50)和表皮生长因子受体(EGFR)在食管癌中的表达及临床预后关系,本研究采用免疫组化方法检测66例食管癌及癌旁组织中EBP50和EGFR蛋白的表达。研究发现,EBP50在食管癌组织中的表达低于癌旁正常食管组织(p0.05);EGFR高表达和EBP50低表达与食管鳞癌的大小、浸润、分期及淋巴结转移密切相关(p<0.05);食管癌组织中EBP50与EGFR的蛋白表达呈负相关(r=0.969,p<0.05),而联合EBP50低表达、EGFR高表达的患者存在比较差的预后(p<0.05)。本研究表明,EBP50蛋白的低表达和EGFR蛋白的高表达可能参与了食管癌的发展、侵袭和转移的过程,可作为预测食管癌预后的重要指标。

关键词：食管癌表皮生长因子受体磷酸化蛋白50