检索结果-南通市图书馆

Evidence for distortion-induced local electric polarization in α-RuCl3

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2024年第9期Mechanics & Astronomy) .卷 169-177页

作者： Xinrun Mi De Hou Xiao wang Sabreen Hammouda Caixing Liu Zijian Xiong Han Li Yan Liu Guiwen wang aifeng wang Yisheng Chai Yang Qi Wei Li Xiaoyuan Zhou Yixi Su D.I.Khomskii Mingquan He Zhigao Sheng Young Sun College of Physics Center of Quantum Materials and DevicesChongqing University Anhui Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field LaboratoryHefei Institutes of Physical ScienceAnhuiChinese Academy of Sciences University of Science and Technology of China Jülich Centre for Neutron Scienceat Heinz Maier-Leibnitz Zentrum(JCNS-MLZ) Forschungszentrum Jülich GmbH School of Physics Beihang University Analytical and Testing Center Chongqing University State Key Laboratory of Surface Physics Department of PhysicsFudan University CAS Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsChinese Academy of Sciences Ⅱ.Physikalisches Institut Universit?t zu K?ln

The spin-orbit assisted Mott insulator α-RuCl3is a prime candidate for material realization of the Kitaev quantum spin *** little attention has been paid to charge degrees of freedom, charge effects, such as electric polarization, may arise in this system. Here, we report distortion-induced local electric polarization in α-RuCl3as evidenced by single-crystal X-ray diffraction,second harmonic generation（SHG） and dielectric measurements. The SHG signal appears at room temperature and develops substantially in the Kitaev paramagnetic state when short-range spin correlations come into play. Despite sizable pyroelectric currents in the Kitaev paramagnetic state, the absence of hysteresis in the polarization-electric field（P-E） points to the shortrange nature of electric polarization. This localized electric polarization is likely the result of distortion-induced charge dimerization, achieved through virtual hopping-induced charge redistribution. In addition, the electric polarization is boosted by short-range spin correlations via spin-phonon coupling in the Kitaev paramagnetic state. Our results emphasize the importance of charge degrees of freedom in α-RuCl3, which establish a novel platform to investigate charge effects in Kitaev materials.

关键词： Mott insulator Kitaev quantum spin liquid electric polarization

Evidence for distortion-induced local electric polarization in α-RuCl

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2024年

作者： Xinrun Mi De Hou Xiao wang Sabreen Hammouda Caixing Liu Zijian Xiong Han Li Yan Liu Guiwen wang aifeng wang Yisheng Chai Yang Qi Wei Li Xiaoyuan Zhou Yixi Su D.I.Khomskii Mingquan He Zhigao Sheng Young Sun College of Physics Center of Quantum Materials and Devices Chongqing University Anhui Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field Laboratory Hefei Institutes of Physical Science Anhui Chinese Academy of Sciences University of Science and Technology of China Jülich Centre for Neutron Scienceat Heinz Maier-Leibnitz Zentrum (JCNS-MLZ) Forschungszentrum Jülich GmbH School of Physics Beihang University Analytical and Testing Center Chongqing University State Key Laboratory of Surface Physics Department of Physics Fudan University CAS Key Laboratory of Theoretical Physics Institute of Theoretical Physics Chinese Academy of Sciences II.Physikalisches Institut Universit?t zu K?ln

关键词：

多主体参与下食品安全社会共治演化博弈稳定性

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

中国管理科学 2024年第4期32卷 325-334页

作者：杨松张言彩王爱峰淮阴师范学院商学院江苏淮安223001 淮阴师范学院数学与统计学院江苏淮安223001

食品安全关系人民群众身体健康和生命安全,党的二十大报告提出强化食品药品安全监管。针对食品市场由于信息不对称导致的市场失灵问题,本文构建了由地方政府、食品企业和公众组成的演化博弈模型,利用复制动态方程分析了不同情形下系统... 详细信息

食品安全关系人民群众身体健康和生命安全,党的二十大报告提出强化食品药品安全监管。针对食品市场由于信息不对称导致的市场失灵问题,本文构建了由地方政府、食品企业和公众组成的演化博弈模型,利用复制动态方程分析了不同情形下系统的均衡点和演化稳定策略,并进行数值仿真分析。结果表明:在食品安全社会共治博弈系统中存在三个稳定的均衡策略,系统演化均衡随着食品企业违规收益、政府惩罚强度和政府对公众奖励的变化而向不同稳定均衡策略演进。政府惩罚强度、政府监管成本和食品企业违规收益是影响参与主体行为演化路径的主要因素。三个稳定的均衡策略分别对应于我国食品安全治理体系演变的不同阶段。为了缓解食品安全治理风险,政府要加大惩罚力度,降低监管成本,加强企业自律,引导公众参与治理,构建多元主体相互协调的社会共治格局。

关键词：食品安全社会共治演化博弈

Al改性MgB_(2)材料与金属界面特性及其超导性能研究

在线全文

学校读者我要写书评

暂无评论

功能材料 2024年第4期55卷 4007-4012页

作者：唐诗雨何佳黎学明杨文静王爱峰倪子惠周善彬重庆大学化学化工学院重庆400000 重庆大学物理学院重庆400000

针对MgB_(2)超导材料用于液氢液位传感器的临界转变温度与液氢液化温度差异大和原始粉末与金属护套界面反应导致测量控制难的问题,研究了降低MgB_(2)临界转变温度的改性技术,以及改性后粉末与金属护套Fe、Monel反应产物及退火温度对其... 详细信息

针对MgB_(2)超导材料用于液氢液位传感器的临界转变温度与液氢液化温度差异大和原始粉末与金属护套界面反应导致测量控制难的问题,研究了降低MgB_(2)临界转变温度的改性技术,以及改性后粉末与金属护套Fe、Monel反应产物及退火温度对其超导转变宽度的影响。结果表明,当掺杂量x=0.15时,Mg_(1-x)Al_xB_(2)多晶样品的临界转变温度为30 K左右,满足液氢液位传感器使用环境。金属护套Fe、Monel与前驱体粉末Mg、Al之间都有不同程度的扩散界面发生,Fe金属护套样品扩散层厚度较小,大约为25μm,更适合于Al掺杂MgB2超导线材的制备护套材料。不同退火温度下的带金属护套的Fe、Monel改性MgB_(2)样品仍具有明显的超导转变,且超导转变温度满足液氢液位计使用环境。

关键词： MgB_(2) Al掺杂扩散层临界转变温度超导性能

高压氧治疗不同时期联合躯干控制训练对缺血性脑卒中患者认知及运动康复的效果

在线全文

学校读者我要写书评

暂无评论

贵州医科大学学报 2024年第7期49卷 1070-1076页

作者：郭正会杨梦兰王爱凤方大钊淮安市第一人民医院神经外科江苏淮安223300

目的探讨高压氧治疗不同时期联合躯干控制训练对缺血性脑卒中患者康复的效果。方法缺血性脑卒中患者116例随机均分为对照组和观察组,两组均接受溶栓治疗,对照组在高压氧干预后行躯干控制训练、观察组在高压氧干预的同时展开躯干控制训练... 详细信息

目的探讨高压氧治疗不同时期联合躯干控制训练对缺血性脑卒中患者康复的效果。方法缺血性脑卒中患者116例随机均分为对照组和观察组,两组均接受溶栓治疗,对照组在高压氧干预后行躯干控制训练、观察组在高压氧干预的同时展开躯干控制训练,均治疗4周;于干预前、干预后分别采用简易智力状态检查量表(MMSE)评估患者认知水平,美国国立卫生研究院卒中量表(NIHSS)评估神经缺损情况,Berg平衡量表(BBS)评估平衡能力,Sheikh躯干控制量表(Sheikh)评估躯干控制能力,Fugl-Meyer评定量表(FMA)评估肢体功能,功能独立性评定量表(FIM)评估患者功能独立性;采集患者干预前、干预后外周静脉血5 mL,检测两组患者神经生长因子、神经元特异性烯醇化酶及髓鞘碱性蛋白水平。结果干预后,两组患者MMSE评分均高于干预前、NIHSS评分低于干预前,且观察组MMSE评分高于对照组、NIHSS评分低于对照组(P<0.05);干预后,两组患者BBS、Sheikh评分高于干预前,且观察组高于对照组(P<0.05);干预后,两组FMA、FIM评分高于干预前,且观察组高于对照组(P<0.05);干预后,两组血清神经生长因子高于干预前,神经元特异性烯醇化酶、髓鞘碱性蛋白低于干预前,观察组神经生长因子高于对照组,神经元特异性烯醇化酶、髓鞘碱性蛋白低于对照组(P<0.05)。结论高压氧干预治疗同时进行躯干控制训练,有利于缺血性脑卒中患者认知功能、平衡运动功能的恢复。

关键词：缺血性脑卒中高压氧躯干控制训练神经损伤认知功能

Trend of Storm Surge Induced by Typical Landfall Super Typhoons During 1975–2021 in the Eastern China Sea

在线全文

学校读者我要写书评

暂无评论

Journal of Ocean University of China 2024年第2期23卷 277-286页

作者： LUO Feng wang Yi TAO aifeng SHI Jian wang Yongzhi ZHANG Chi College of Harbour Coastal and Offshore EngineeringHohai UniversityNanjing 210098China Nantong Ocean and Coastal Engineering Research Institute Hohai UniversityNantong 226000China Key Laboratory of Ministry of Education for Coastal Disaster and Protection Hohai UniversityNanjing 210098China College of Meteorology and Oceanography National University of Defense TechnologyChangsha 410073China The First Institute of Oceanography MNRQingdao 266061China

Climate change affects the activity of global and regional tropical cyclones(TCs).Among all TCs,typical super typhoons(STYs)are particularly devastating because they maintain their intensity when landing on the coast and thus cause casualties,economic losses,and environmental *** a 3D tidal model,we reconstructed the typhoon(TY)wind field to simulate the storm surge induced by typical *** TY activity was then analyzed using historical *** showed a downtrend of varying degrees in the annual frequency of STYs and TCs in the Western North Pacific(WNP)Basin,with a significant trend change observed for TCs from 1949 to 2021.A large difference in the interannual change in frequency was found between STYs and TCs in the WNP and Eastern China Sea(ECS).Along the coast of EC,the frequency of landfall TCs showed a weak downtrend,and the typical STYs showed reverse micro growth with peak activity in ***,Fujian,and Taiwan were highly vulnerable to the frontal hits of typical *** by climate change,the average lifetime maximum intensity(LMI)locations and landfall locations of typical STYs in the ECS basin showed a significant poleward migration *** addition,the annual average LMI and accumulated cyclone energy showed an uptrend,indicating the increasing severity of the disaster *** by the typical STY activity in the ECS,the maximum storm surge area also showed poleward migration,and the coast of North China faced potential growth in high storm surge risks.

关键词： storm surge super typhoons tropical cyclones eastern China Sea poleward migration

高频经颅磁刺激联合康复训练对脑卒中后吞咽障碍患者表面肌电图的影响

在线全文

学校读者我要写书评

暂无评论

中华保健医学杂志 2024年第1期26卷 30-33页

作者：夏海桃佟强王爱凤王青梅蒋娟孙华娟陈萍南京医科大学附属淮安第一医院神经内科淮安223300 不详

目的探讨高频经颅磁刺激(TMS)联合康复训练对脑卒中后吞咽障碍患者表面肌电图(sEMG)的影响。方法选取南京医科大学附属淮安第一医院神经内科2022年1月~2023年1月收治的脑卒中后吞咽障碍患者100例,采用随机数表法分为观察组和对照组,各5... 详细信息

目的探讨高频经颅磁刺激(TMS)联合康复训练对脑卒中后吞咽障碍患者表面肌电图(sEMG)的影响。方法选取南京医科大学附属淮安第一医院神经内科2022年1月~2023年1月收治的脑卒中后吞咽障碍患者100例,采用随机数表法分为观察组和对照组,各50例。对照组给予常规吞咽康复训练,观察组在对照组基础上联合高频TMS治疗。比较两组患者临床疗效;评估两组患者洼田饮水试验等级以及标准吞咽功能评定量表(SSA)和吞咽障碍严重度评估量表(DOSS)评分;检测两组患者舌骨上、下肌群最大波幅值及吞咽时程;评估两组患者吞咽生存质量问卷(SWAL-QOL)评分。结果观察组总有效率96.00%显著高于对照组82.00%,差异有统计学意义(χ2=5.005,P<0.05);治疗后,两组患者洼水试验评估等级改善显著优于治疗前,且观察组改善显著优于对照组,差异有统计学意义(Z=4.157,P<0.05)。治疗后,两组患者SSA评分低于治疗前,DOSS评分高于治疗前,且观察组SSA评分低于对照组,DOSS评分高于对照组[(23.15±3.51)分vs.(28.21±4.59)分、(6.11±0.78)分vs.(5.16±0.89)分],差异有统计学意义(t=6.192、5.676,P<0.05)。治疗后,两组患者舌骨上、下肌群最大波幅值均显著高于治疗前,吞咽时程短于治疗前,且观察组治疗后舌骨上、下肌群最大波幅值均显著高于对照组,吞咽时程短于对照组[(752.46±94.56)μg vs.(605.45±65.48)μg、(732.12±82.15)μg vs.(594.56±55.89)μg、(1.83±0.42)s vs.(2.15±0.62)s、(1.87±0.41)s vs.(2.32±0.54)s],差异有统计学意义(t=9.038、9.790、3.022、4.693,P<0.05);两组治疗后SWAL-QOL评分显著高于治疗前,且观察组显著高于对照组[(185.45±14.41)分vs.(164.45±15.21)分],差异有统计学意义(t=26.258,P<0.05)。结论高频振幅值增加可促进脑卒中后吞咽障碍患者大脑神经元兴奋性增加,致使其引起更多神经元发放行动电位,促进神经元之间的连接和信息传递,不仅可有效改善患者临床症状以及吞咽功能,还能改善其舌骨上、下肌群最大波幅值、吞咽时程以及生活质量。

关键词：高频经颅磁刺激康复训练脑卒中吞咽障碍表面肌电图

Overview on Mangrove Forest Disaster Prevention and Mitigation Functions

在线全文

学校读者我要写书评

暂无评论

Journal of Ocean University of China 2024年第1期23卷 46-56页

作者： CHEN Xinping YIN Ziqi LI Zibin wang Bin TAO aifeng GUO Zhixing wang Fei AN Yanhong O’DRISCOLL Kieran College of Harbour Coastal and Offshore EngineeringHohai UniversityNanjing 210098China National Marine Hazard Mitigation Service Beijing 100194China The People’s Government of Hainan Province Haikou 570204China Hibernian Marine Systems Limited Cork T12EDD8Ireland

This paper provides a comprehensive overview on coastal protection and hazard mitigation by *** stud-ies have made great strides to understand the mechanisms and influencing factors of mangroves’protection function,including wave energy dissipation,storm surge damping,tsunami mitigation,adjustment to sea level rise and wind speed reduction,which are sys-tematically summarized in this ***,the study analyzes the extensive physical models,based on indoor flume experi-ments and numerical models,that consider the interaction between mangroves and hydrodynamics,to help our understanding of mangrove-hydrodynamic ***,quantitative approaches for valuing coastal protection services provided by man-groves,including index-based and process-resolving approaches,are introduced in ***,we point out the limitations of previous studies,indicating that efforts are still required for obtaining more long-term field observations during extreme weather events,to create more real mangrove models for physical experiments,and to develop numerical models that consider the flexible properties of mangroves to better predict wave propagation in mangroves having complex morphology and structures.

关键词： mangrove coastal protection disaster prevention and mitigation disaster reduction value coastal resilience

在线全文

学校读者我要写书评

暂无评论

大桥沟煤矿近距离煤层群开采巷道支护设计

能源与节能 2023年第5期 131-133页

作者：王爱峰山西忻州神达大桥沟煤业有限公司山西河曲036500

近距离煤层开采时巷道受重复扰动的影响会出现不稳定的情况。结合大桥沟煤矿的实际地质条件,对与9号煤层距离较近的10号煤层和11号煤层的回采巷道进行设计。当10号煤层与9号煤层的间距大于4.5m时,采用锚杆+金属网+短锚索联合支护的方式... 详细信息

近距离煤层开采时巷道受重复扰动的影响会出现不稳定的情况。结合大桥沟煤矿的实际地质条件,对与9号煤层距离较近的10号煤层和11号煤层的回采巷道进行设计。当10号煤层与9号煤层的间距大于4.5m时,采用锚杆+金属网+短锚索联合支护的方式;当层间距小于4.5m时,采用锚杆+金属网+工字钢棚的联合支护方式。11号煤层宜采用以被动支护为主的架棚支护方式,并辅助以锚杆补强。

关键词：近距离煤层群回采巷道支护设计