检索结果-南通市图书馆

Anisotropic magnetism and band evolution induced by ferromagnetic phase transition in titanium-based kagome ferromagnet SmTi_3Bi_4

引用

Science China(Physics,Mechanics & Astronomy) 2024年第6期67卷 137-145页

作者： zhe zheng Long Chen Xuecong Ji Ying Zhou Gexing Qu Mingzhe Hu Yaobo Huang Hongming Weng Tian Qian Gang Wang Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China School of Physics and Engineering Henan University of Science and TechnologyLuoyang 471023China Shanghai Synchrotron Radiation Facility Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201210China Songshan Lake Materials Laboratory Dongguan 523808China CAS Center for Excellence in Topological Quantum Computation Chinese Academy of SciencesBeijing 100190China

Kagome magnets with diverse topological quantum responses are crucial for next-generation topological engineering.The anisotropic magnetism and band evolution induced by ferromagnetic phase transition(FMPT)is reported in a newly discovered titanium-based kagome ferromagnet Sm Ti3Bi4,which features a distorted Ti kagome lattice and Sm atomic zig-zag chains.Temperature-dependent resistivity,heat capacity,and magnetic susceptibility reveal a ferromagnetic ordering temperature Tc of23.2 K.A large magnetic anisotropy,observed by applying the magnetic field along three crystallographic axes,identifies the b axis as the easy axis.Angle-resolved photoemission spectroscopy with first-principles calculations unveils the characteristic kagome motif,including the Dirac point at the Fermi level and multiple van Hove singularities.Notably,a band splitting and gap closing attributed to FMPT is observed,originating from the exchange coupling between Sm 4 f local moments and itinerant electrons of the kagome Ti atoms,as well as the time-reversal symmetry breaking induced by the long-range ferromagnetic order.Considering the large in-plane magnetization and the evolution of electronic structure under the influence of ferromagnetic ordering,such materials promise to be a new platform for exploring the intricate electronic properties and magnetic phases based on the kagome lattice.

关键词： kagome lattice anisotropic magnetism band splitting ferromagnetic phase transition ARPES

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Identifying coronary artery bypass grafting patients at high risk for adverse long-term prognosis using serial health-related quality of life assessments

引用

中华医学杂志(英文版) 2024年第9期137卷 1069-1077页

作者： Wang Juncheng Liu Hanning Yue Chao Yang Limeng Yang Kai Zhao Yan Ren Huan Zhang Ying zheng zhe National Clinical Research Center for Cardiovascular Diseases State Key Laboratory of Cardiovascular Disease Fuwai Hospital National Center for Cardiovascular Diseases Chinese Academy of Medical Sciences and Peking Union Medical College Beijing China Department of Cardiovascular Surgery Fuwai Hospital National Center for Cardiovascular Diseases Chinese Academy of Medical Sciences and Peking Union Medical College Beijing China Department of Vascular Surgery Fuwai Hospital National Center for Cardiovascular Diseases Chinese Academy of Medical Sciences and Peking Union Medical College Beijing China Department of Cardiac Surgery Wuhan Asia Heart Hospital Wuhan Hubei China

Background: Patients who undergo coronary artery bypass grafting (CABG) are known to be at a significant risk of experiencing long-term adverse events, emphasizing the importance of regular assessments. Evaluating health-related quality of life (HRQoL) serves as a direct method to gauge prognosis. Our objective is to ascertain the prognostic significance of consecutive HRQoL assessments using the Physical Component Summary (PCS) and Mental Component Summary (MCS) derived from the Short-Form 36 (SF-36) health survey in CABG patients.Methods: The study population consisted of 433 patients who underwent isolated elective CABG at Fuwai Hospital between 2012 and 2013. SF-36 assessments were conducted during both the hospitalization period and follow-up. The primary endpoint of the study was all-cause mortality, while the secondary outcome was a composite measure including death, myocardial infarction, stroke, and repeat revascularization. We assessed the relationships between the PCS and MCS at baseline, as well as their changes during the first 6 months after the surgery (referred to as ΔPCS and ΔMCS, respectively), and the observed outcomes.Results: The patients were followed for an average of 6.28 years, during which 35 individuals (35/433, 8.1%) died. After adjusting for clinical variables, it was observed that baseline MCS scores (hazard ratio [HR] for a 1-standard deviation [SD] decrease, 1.57; 95% confidence interval [CI], 1.07–2.30) and ΔMCS (HR for a 1-SD decrease, 1.67; 95% CI, 1.09–2.56) were associated with all-cause mortality. However, baseline PCS scores and ΔPCS did not exhibit a significant relationship with all-cause mortality. Notably, there was a dose-response relationship observed between ΔMCS and the likelihood of all-cause mortality (HRs for the 2nd, 3rd and 4th quartiles compared to the 1st quartile, 0.33, 0.45 and 0.11, respectively).Conclusions: Baseline MCS and changes in MCS were independent predictors for long-term mortality of CABG. Better mental health status and recovery indicated better

关键词： Coronary artery bypass grafting Coronary artery disease Prognosis Quality of life Short-Form 36 Risk factor Serial measurements

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

主动脉瓣修复术的历史、现状和未来

引用

中华外科杂志 2024年第5期62卷 364-369页

作者：孙境郑哲中国医学科学院、北京协和医学院、国家心血管病中心、阜外医院心血管外科北京100037

主动脉瓣修复术是一种古老的手术方式,它与主动脉瓣置换术同时起步,但由于效果不佳逐渐被舍弃。目前主动脉瓣置换术已成为主动脉瓣功能障碍伴或不伴主动脉根部病变患者的首选治疗方法。由于人工瓣膜面临衰败和抗凝相关并发症,主动脉瓣... 详细信息

主动脉瓣修复术是一种古老的手术方式,它与主动脉瓣置换术同时起步,但由于效果不佳逐渐被舍弃。目前主动脉瓣置换术已成为主动脉瓣功能障碍伴或不伴主动脉根部病变患者的首选治疗方法。由于人工瓣膜面临衰败和抗凝相关并发症,主动脉瓣修复术再次成为一种治疗选择,它避免了人工瓣膜相关的长期风险,但存在主动脉瓣关闭不全复发的风险。主动脉根部重塑术和再植术两种划时代手术的出现,降低了关闭不全复发的风险。主动脉根部功能解剖概念与主动脉瓣关闭不全机制的提出与确立奠定了现代主动脉瓣修复的理论基础。主动脉瓣修复成为一种涉及瓣环、窦部、窦管交界、瓣叶等的综合修复策略,患者术后远期生存率接近健康人群,瓣膜相关再干预率与瓣膜置换术相似,逐渐成为主动脉瓣关闭不全伴或不伴主动脉根部病变患者的一种替代治疗方式。

关键词：主动脉瓣关闭不全心血管外科手术主动脉瓣修复术主动脉瓣置换术再手术

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

基于云端的信息化测绘网络教学平台设计与开发

引用

实验室研究与探索 2024年第4期43卷 155-159,189页

作者：张敏郑哲福建信息职业技术学院建筑工程学院福州350003 福建省地质测绘院福州350011

针对测绘学科存在的实践教学条件难以突破、教学组织管理不完善等问题,探讨了“互联网+测绘”的教育改革思路,设计并开发基于云端的信息化测绘网络教学平台。平台按照5层架构进行整体框架设计,应用了数据环境建构、虚拟化实验项目设计... 详细信息

针对测绘学科存在的实践教学条件难以突破、教学组织管理不完善等问题,探讨了“互联网+测绘”的教育改革思路,设计并开发基于云端的信息化测绘网络教学平台。平台按照5层架构进行整体框架设计,应用了数据环境建构、虚拟化实验项目设计、自主性底层框架结构设计、分布式虚拟现实等关键技术,整合了教学资源管理、线上虚拟仿真实验、线下移动式实验平台、数据智能评分、教务综合管理等功能需求,建设形成“人人皆学、处处能学、时时可学”的学习型空间。平台有效突破了时空限制,改善了测绘学科实践教学条件,优化了实践教学组织与管理,取得了良好的实践教学应用成效。

关键词：测绘信息化网络教学平台虚拟仿真移动式实验分布式虚拟现实

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Principle and key technology of generalized high precision simulation of TT&C channel

引用

Journal of Systems Engineering and Electronics 2013年第2期24卷 318-323页

作者： Yang Zhou zhe zheng Siliang Wu School of Information and Electronics Beijing Institute of Technology

A generalized simulation method of the tracking,telemetry and control（TT＆C） channel,which is applicable to wideband and arbitrary radio frequency（RF） signal,is proposed.It can accurately simulate the dynamic transmission delay of the arbitrary RF signal in channels,especially regardless of any prior knowledge including signal form,signal parameters,and so on.The proposed method orthogonally demodulates the wideband and arbitrary RF signal to complex baseband by a known local oscillator（LO） signal.Whereafter,it takes measures to obtain the delay reconstruction signal of baseband signals based on the dynamic transmission delay between a ground station and a responder.Meanwhile,it manages to obtain the delay reconstruction signal of LO signals.The simulation output signal（the delayed RF signal） can be achieved through the synthesis of the two delay reconstruction signals mentioned above.The principle and its related key technology are described in detail,and the realizable system architecture is given.

关键词： generalization channel simulation high precision dynamic delay reconstruction dynamic delay cancellation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

对称幺半范畴与相对Lefschetz-Verdier迹公式

引用

数学学报（中文版） 2024年第2期67卷 323-340页

作者：陆晴郑维喆北京师范大学数学科学学院北京100875 中国科学院数学与系统科学研究院北京100190 中国科学院大学北京100190

本文通过一系列具体的实例展示对称么半范畴中对偶和迹的重要作用,并介绍其在平展上同调中的新应用—万有局部零调性的刻画和相对Lefschetz-Verdier迹公式.

关键词：对称幺半范畴迹平展上同调 Lefschetz-Verdier公式

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Surgical left atrial appendage occlusion in patients with atrial fibrillation undergoing mechanical heart valve replacement

引用

Chinese Medical Journal 2020年第16期133卷 1891-1899页

作者： Ye zheng Chen-Fei Rao Si-Peng Chen Li He Jian-Feng Hou zhe zheng Department of Cardiovascular Surgery Fuwai HospitalNational Center for Cardiovascular DiseasesChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing 100037China Information Center Fuwai HospitalNational Center for Cardiovascular DiseasesChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing 100037China.

Background:Surgical left atrial appendage occlusion(SLAAO)may be associated with a lower risk of thromboembolism in patientswith atrial fibrillation undergoing cardiac surgery.However,evidence regarding the effectiveness of SLAAO in patients undergoingmechanical heart valve replacement(MHVR)is lacking.Therefore,we aimed to evaluate the association between SLAAO and thecardiovascular outcomes in patients with atrial fibrillation undergoing MHVR.Methods:We retrospectively analyzed data for 497 patients with atrial fibrillation;27.6%of the patients underwent SLAAO,andthe remainder of the patients did not(No-SLAAO group).The primary outcome was a composite of ischemic stroke,systemicembolism,and all-cause mortality.Cumulative event-free survival rates were estimated using Kaplan-Meier curves,and weperformed multivariate Cox analyses to evaluate the association between SLAAO and outcomes.We used one-to-one propensityscore matching to balance patients’baseline characteristics,and analyzed 120 matching pairs.Results:Five patients died within 30 days postoperatively,and there were no significant differences between the two groupsregarding in-hospital complications(all P>0.05).After a median follow-up of 14 months,14 primary events occurred.Kaplan-Meier curves showed no difference in the cumulative incidence of freedom from the primary outcome(log-rank P=0.830),hemorrhagic events(log-rank P=0.870),and the secondary outcome(log-rank P=0.730),between the two groups.MultivariableCox proportional hazards regression analysis showed no association between SLAAO and any outcome(all P>0.05).Afterpropensity score matching,cardiopulmonary bypass time and aortic cross-clamp time,and the postoperative length of stay weresignificantly longer in the SLAAO group(all P<0.05);results were similar to the unadjusted analyses.Conclusions:Concomitant SLAAO and MHVR was associated with longer length of stay,and cardiopulmonary bypass time andaortic cross-clamp time,but was not associated with additional protective effects against thromboemboli

关键词： Atrial fibrillation Heart valve prosthesis implantation Propensity score

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

基于TSN的智能变电站流量确定性传输

引用

北京邮电大学学报 2024年第2期47卷 110-117页

作者：池颖英朱海龙李庆郑哲刘瑞北京智芯微电子科技有限公司北京102200 北京邮电大学信息与通信工程学院北京100876 网络通信与安全紫金山实验室南京211111

针对智能变电站三层两网及点对点传输架构存在的布线复杂和运维效率低下的问题,设计了一种基于时间敏感网络(TSN)的智能变电站“全站共网”的组网方案,以实现多种类型智能变电站报文在同一网络中混合传输。考虑到智能变电站通信网络流... 详细信息

针对智能变电站三层两网及点对点传输架构存在的布线复杂和运维效率低下的问题,设计了一种基于时间敏感网络(TSN)的智能变电站“全站共网”的组网方案,以实现多种类型智能变电站报文在同一网络中混合传输。考虑到智能变电站通信网络流量种类较多,针对较低时延要求的突发性事件报文和周期性报文混合传输带来的不确定性问题,利用IEEE 802.1Qbv中的时间感知整形器功能,对网络中所有具有时延要求的流量进行了调度规划,制定了流量调度约束,并求解了网络设备流量传输的调度参数。设计了两个场景下的仿真实验,将调度参数配置到仿真实验中的TSN节点,使得流量按照求解的时隙进行传输,并对有无Qbv门控调度和背景流量的干扰进行了多组对比实验。实验结果表明,制定的Qbv门控调度策略能够保证智能变电站多种流量的混合传输,具有严格时延要求的流量能够在专门的时隙中进行传输,调度流量不受背景流量的干扰,实现了智能变电站报文的低时延确定性传输。

关键词：智能变电站时间敏感网络时间感知整形器流量调度

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

全动脉冠状动脉旁路移植术的临床应用现状与策略

引用

中国胸心血管外科临床杂志 2024年第2期31卷 304-310页

作者：韩家炜张恒郑哲国家心血管病中心中国医学科学院阜外医院国家心血管疾病临床医学研究中心心血管疾病国家重点实验室北京100037 国家心血管病中心中国医学科学院北京协和医学院阜外医院心血管外科北京100037

自冠状动脉旁路移植手术问世以来,移植血管材料的选择一直是领域内最具争议性的话题之一,其中动脉桥血管由于优良的生物学特性和高通畅率受到广泛关注。近年来,我国动脉桥及全动脉桥应用比例有所提高,但与欧美国家仍有一定差距。既往多... 详细信息

自冠状动脉旁路移植手术问世以来,移植血管材料的选择一直是领域内最具争议性的话题之一,其中动脉桥血管由于优良的生物学特性和高通畅率受到广泛关注。近年来,我国动脉桥及全动脉桥应用比例有所提高,但与欧美国家仍有一定差距。既往多项临床研究肯定了全动脉桥在桥通畅率和远期预后方面的优势,但这一结论仍有待高质量随机对照临床试验验证。本文综述全动脉桥冠状动脉旁路移植术的临床应用现状与策略,为后续临床研究和诊疗提供参考。

关键词：冠状动脉旁路移植术全动脉桥乳内动脉综述

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Clinical indices and mortality of hospitalized avian influenza A (H7N9) patients in Guangdong, China

引用

Chinese Medical Journal 2019年第3期132卷 302-310页

作者： Yang Yang Xue Li Guthrie S.Birkhead zhe zheng Jia-hai Lu Department of Medical Statistics and Epidemiology School of Public HealthSun Yat-sen UniversityGuangzhouGuangdong 510080China Department of Epidemiology and Biostatistics School of Public HealthUniversity at AlbanyNY 12222USA Key Laboratory of Tropical Disease Control Sun Yat-sen UniversityMinistry of EducationGuangzhouGuangdong 510080China One Health Center of Excellence for Research &Training Sun Yat-sen UniversityGuangzhouGuangdong 510080China

Background:Six epidemic waves of human infection with avian influenza A (H7N9) virus have emerged in China with high mortality. However, study on quantitative relationship between clinical indices in ill persons and H7N9 outcome (fatal and nonfatal) is still unclear. A retrospective cohort study was conducted to collect laboratory-confirmed cases with H7N9 viral infection from 2013 to 2015 in 23 hospitals across 13 cities in Guangdong Province, China.Methods:Multivariable logistic regression model and classification tree model analyses were used to detect the threshold of selected clinical indices and risk factors for H7N9 death. The receiver operating characteristic curve (ROC) and analyses were used to compare survival and death distributions and differences between indices. A total of 143 cases with 90 survivors and 53 deaths were investigated.Results:Average age (Odds Ratio (OR)=1.036, 95% Confidence Interval (CI)=1.016-1.057), interval days between dates of onset and confirmation (OR=1.078, 95% CI=1.004-1.157), interval days between onset and oseltamivir treatment (OR=5.923, 95% CI=1.877-18.687), body temperature (BT) (OR=3.612, 95% CI=1.914-6.815), white blood cell count (WBC) (OR=1.212, 95% CI=1.092-1.346) were significantly associated with H7N9 death after adjusting for confounders. The chance of death from H7N9 infection was 80.0% if BT was over 38.1 °C, and chance of death is 67.4% if WBC count was higher than 9.5 (109/L). Only 27.1% of patients who began oseltamivir treatment less than 9.5 days after disease onset died, compared to 68.8% of those who started treatment more than 15.5 days after onset.Conclusions:The intervals between date of onset and confirmation of diagnosis, between date of onset to oseltamivir treatment, age, BT and WBC are found to be the best predictors of H7N9 mortality.

关键词： Clinical markers Hospitalization Influenza A virus H7N9 subtype

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：