检索结果-南通市图书馆

His-Purkinje conduction system pacing combined with atrioventricular node ablation improves quality of life in older patients with persistent atrial fibrillation refractory to multiple ablation procedures

引用

Journal of Geriatric Cardiology 2023年第2期20卷 130-138页

作者： Peng QI Yi-Zhen YANG Liang SHI Yan-Jiang WANG Ying TIAN Ke-Xin YUAN Xue-Feng CHEN Shu-Ren LI Yi DANG Xing-Peng LIU Heart Center Beijing Chaoyang HospitalCapital Medical UniversityBeijingChina Heart Center Hebei General HospitalHebeiChina

BACKGROUND Recurrence of atrial fibrillation(AF)is common in patients with persistent AF even after multiple ablation procedures.His-Purkinje conduction system pacing(HPCSP)combined with atrioventricular node ablation(AVNA)is effective in managing patients with AF and heart failure.This study aimed to determine whether HPCSP combined with AVNA can improve quality of life and alleviate symptoms in older patients with symptomatic persistent AF refractory to multiple ablation procedures,as well as evaluate the feasibility and safety of this therapy.METHODS Older patients(≥65 years)with symptomatic persistent AF refractory to at least two ablation procedures were treated with combined HPCSP and AVNA.The success rates and complications were recorded.Pacing parameters,European Heart Rhythm Association(EHRA)scores,and Atrial Fibrillation Effect on Quality-of-Life(AFEQT)scores obtained perioperatively were compared with those recorded at the 6-month follow-up examination.RESULTS Thirty-one patients were enrolled;of those,only thirty patients were eventually treated with AVNA because one patient developed a complete atrioventricular block following the withdrawal of the His bundle pacing lead.The success rates were 100%for HPCSP(22 cases with His bundle pacing,and 9 cases with left bundle branch pacing)and 93.3%(28/30)for AVNA,respectively.By the 6-month follow-up examination,EHRA scores improved significantly(3.00±0.73 vs.2.44±0.63,P=0.014)and AFEQT scores increased markedly(49.6±20.6 vs.70.9±14.0,P=0.001).No severe complications developed.CONCLUSIONS When used in older patients with symptomatic persistent AF refractory to multiple ablation procedures,HPCSP combined with AVNA significantly alleviated symptoms and improved quality of life during short-term follow-up.This therapy was proved to be safe and effective in this patient population.

关键词： patients markedly conduction

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

Risk of conduction disturbances following different transcatheter aortic valve prostheses:the role of aortic valve calcifications

引用

Journal of Geriatric Cardiology 2022年第3期19卷 167-176页

作者： Francesco Pollari Ferdinand Vogt Irena Großmann Jill Marianowicz Marie Claes Steffen Pfeiffer Johannes Schwab Theodor Fischlein Cardiac Surgery Cardiovascular CenterKlinikum NürnbergParacelsus Medical UniversityNurembergGermany Cardiology Cardiovascular CenterKlinikum NürnbergParacelsus Medical UniversityNurembergGermany Radiology Klinikum NürnbergParacelsus Medical UniversityNurembergGermany

OBJECTIVES To assess the impact of prosthesis choice and aortic valve calcifications on the occurrence of conduction disturb-ances after transcatheter aortic valve implantation(TAVI).METHODS We retrospectively analyzed the preoperative clinical characteristics,electrocardiograms,contrast-enhanced mul-tidetector computed tomography scans and procedural strategies of patients who underwent TAVI in our center between January 2012 and June 2017.Quantification of calcium volume was performed for each aortic cusp above(aortic valve)and below(left ventricular outflow tract,LVOT)the basal plane.Multivariate analysis was performed to evaluate risk factors for the onset of new bundle branch block(BBB),transient and permanent atrioventricular block(tAVB,pAVB).RESULTS A total of 569 patients were included in the study.Six different prostheses were implanted(Edwards Sapien XT,n=162;Edwards Sapien 3,n=240;Medtronic CoreValve,n=27;Medtronic CoreValve Evolut R,n=21;Symetis Acurate,n=56;Sy-metis Acurate neo,n=63).The logistic regression analysis for BBB showed association with baseline left anterior hemiblock.The logistic regression for tAVB,found the prior valvuloplasty and the balloon post-dilatation associated with the outcome.Baseline left and right BBB,degree of oversizing,and LVOT calcification beneath the non-coronary cusp were associated with pAVB.Neither the prosthesis model,nor the use of a self-expandable prosthesis showed statistical significance with the above-men-tioned outcomes on univariate analysis.CONCLUSIONS LVOT calcification beneath the non-coronary cusp,baseline left anterior hemiblock,right BBB,balloon post-dilatation,prior valvuloplasty and oversizing are independently associated with postprocedural conduction disturbances after TAVI.Use of a self-expandable prosthesis may show a lower incidence of AVB,if applied in lower calcified aortic valves.

关键词： aortic balloon conduction

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

Fast Li-ion conduction enabled by graphite fluoride flakes in solid polymer electrolyte

引用

Rare Metals 2023年第10期42卷 3337-3344页

作者： Qing-Hui Li Xiao-Fen Wang Shi-Yuan Zhu Qing-Dong Zhong Song-Li Liu Qiong-Yu Zhou School of Electrical and Information Engineering Changsha University of Science and TechnologyChangsha410114China School of Materials Science and Hydrogen Energy Foshan UniversityFoshan528000China School of Materials Science and Engineering Shanghai UniversityShanghai200444China School of Materials Science and Engineering Yangtze Normal UniversityChongqing400715China

The Li-metal anode in rechargeable Li-metal batteries with a high energy density suffers the side reaction with the liquid electrolytes,resulting in the associated capacity degradation and safety issues.Solid electrolytes are designed to solve the safety problems caused by dendrite growth and the limited electrochemical stability of liquid electrolytes.Here,a poly(ethylene oxide)(PEO)-lithium bis(trifluoromethanesulfonyl) imide(LiTFSI) solid polymer electrolyte(SPE) with cost-wise.

关键词： electrolyte conduction polymer

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

基于神经表面水分子有序排列假定的太赫兹-远红外神经信号产生和传输的初步模型Ⅰ:信号特征

引用

Science Bulletin 2020年第4期65卷 308-317页

作者：向左鲜唐传祥常超刘国治 Department of Engineering Physics Tsinghua UniversityBeijing 100084China Innovation Laboratory of Terahertz Biophysics National Innovation Institute of Defense TechnologyBeijing 100071China

本文基于水分子在神经元表面有序排列等假设,利用量子光学和电动力学等理论研究神经系统中的电磁场问题.作者首先推导了水分子-电磁场-离子的拉格朗日函数,利用拉格朗日方程得到系统随时间演化的动力学方程,并在两能级近似下,利用解析方... 详细信息

本文基于水分子在神经元表面有序排列等假设,利用量子光学和电动力学等理论研究神经系统中的电磁场问题.作者首先推导了水分子-电磁场-离子的拉格朗日函数,利用拉格朗日方程得到系统随时间演化的动力学方程,并在两能级近似下,利用解析方法(主要是微扰理论)和数值方法分别求解上述动力学方程.当初始场强较弱时,微扰理论和数值计算结果符合得较好;当初始场强很强时,由于非线性效应,此时系统存在部分高阶模式.作者还讨论了神经高频电磁场信号的特性(电磁场色散关系、场的时域波形和频谱特征等)以及部分物理参数对神经高频电磁场的影响.最后,作者预测了神经元表面上电磁辐射的多种固有本征振动模式,这些振动模式的频率范围位于太赫兹和远红外波段.

关键词： Neuron THz Infrared Neuron signal generation and conduction Ion oscillation

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

Adaptive Radiative Thermal Camouflage via Synchronous Heat conduction

引用

Chinese Physics Letters 2021年第1期38卷 19-23页

作者：张嘉伟黄诗瑶胡润 Well-Tech Research Institute of China Oilfield Service Limited Beijing 101149China State Key Laboratory of Coal Combustion School of Energy and Power EngineeringHuazhong University of Science and TechnologyWuhan 430074China

The advent of transformation thermotics has seen a boom in development of thermal metamaterials with a variety of thermal functionalities,including phenomena such as thermal cloaking and camouflage.However,most thermal metamaterials-based camouflage devices only tune in-plane heat conduction,which may fail to conceal a target from out-of-plane detection.We propose an adaptive radiative thermal camouflage via tuning out-ofplane transient heat conduction,and it is validated by both simulation and experiment.The physics underlying the performance of our adaptive thermal camouflage is based on real-time synchronous heat conduction through the camouflage device and the background plate,respectively.The proposed concept and device represent a promising new approach to fabrication of conductive thermal metamaterials,providing a feasible and effective way to achieve adaptive thermal camouflage.

关键词： conduction transient plane

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

Suppression of Ambipolar conduction in Schottky Barrier Carbon Nanotube Field Effect Transistors:Modeling,Optimization Using Particle Swarm Intelligence,and Fabrication

引用

Computer Modeling in Engineering & Sciences 2019年第6期119卷 577-591页

作者： P.Reena Monica V.T.Sreedevi School of Electronics Engineering VIT ChennaiVandalur-Kelambakkam RoadChennai603103India School of Electrical Engineering VIT ChennaiVandalur-Kelambakkam RoadChennai603103India

A mathematical model and experimental analysis of the impact of oxide thickness on the ambipolar conduction in Schottky Barrier Carbon Nanotubes(CNTs)Field Effect Transistor(SB CNTFETs)is presented.Suppression of ambipolar conduction in SB CNTFETs is imperative in order to establish them as the future of IC technology.The ambipolar nature of SB CNTFETs leads to a great amount of leakage current.Employing a gate oxide dielectric of thickness,tox^50 nm suppresses the ambipolar behavior.In an SB CNTFET,it is the electric field at the source/drain contacts that control the conductance and the band bending length at the contacts is defined by tox.Therefore,tox is the prime parameter that influences the width of the Schottky barrier and the current in the subthreshold region.Due to the wide SB,there is a loss in on-current due to tunneling,but the current due to thermionic emission is increased by employing a high-κdielectric such as Zirconium dioxide(ZrO2).This work proposes an approach to suppress ambipolar behavior in SB CNTFETs without decreasing the on current.The thickness and dielectric constant of the gate oxide are optimized using the particle swarm optimization(PSO)algorithm to achieve suppression of ambipolar conduction without any loss in on-current.The proposed SB CNTFET was modeled using Verilog-A.Experimental demonstration of the suppression of ambipolar property is also presented.Two SB CNTFETs are fabricated using high-κdielectric such as ZrO2 with different thickness.A device with thin(~5 nm)gate oxide and another device with thick(~50 nm)gate oxide were fabricated.From the experimental results,it is observed that the device with the thin gate oxide exhibited ambipolar characteristics and the device with the thick gate oxide did not exhibit ambipolar characteristics.The increase in thickness,tox,ensures suppression of ambipolar behavior.

关键词： Ambipolar conduction Carbon nanotubes high-κgate oxide Schottky barrier

来源：

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

Discovery of an unknown conduction mechanism in insulating polymers

引用

High Voltage 2020年第4期5卷 403-408页

作者： Gian Carlo Montanari Paolo Seri Leonard A.Dissado Center for Advanced Power Systems Florida State University2000 Levy AvenueFL 32310USA DEI University of BolognaViale del Risorgimento2–40136BolognaItaly Department of Engineering University of LeicesterUniversity RoadLeicesterLE17RHUK

Polymer dielectrics are widely used in electrical and electronic apparatus and devices because of their capability to insulate conductors,withstand high fields and suffer negligible conductive losses.Their near-to-zero conductivity has been explained in terms of long-accepted theories of electronic and ionic transport that lead to the accumulation of local net charge regions at high electric fields.Here the authors describe a previously unknown conduction mechanism consisting of small bipolar ultra-fast charge pulses crossing the polymer with the mobility,as large as,4 to 5 orders of magnitude greater than that of the previously known.The authors show that this motion is a consequence of molecular relaxation processes triggered by the electric field locally enhanced by the pulses themselves.Pulse accumulation at the electrodes increases interface field and thus contributes substantially towards premature failure in insulating dielectrics in DC fields.

关键词： conduction mechanism negligible

来源：

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

Influence of humidity on conduction processes in gas-insulated devices

引用

High Voltage 2020年第2期5卷 143-150页

作者： Malte Tschentscher David Graber Christian M.Franck High Voltage Laboratory ETH Zurich8092 ZurichSwitzerland

Humidity has been considered as one of the main influencing factors that determine the conduction processes and electric strength of gas-insulated systems.Whereas in the past,various studies focused on the change in the partial discharge inception voltages,breakdown strength of homogeneous and inhomogeneous field arrangements,and insulator flashover voltage,recent studies have investigated the changes in ion currents measured through different gas gaps.In the framework of this contribution,a highly precise humidity control circuit has been developed to analyse the significance of humidity in the range from−25 to−5°C frost-point,which is fully applicable to operating gas-insulated devices.Using sulphur hexafluoride(SF6)as the insulation gas at 0.45 MPa,Al2O3-filled epoxy resin insulators,and technically rough electrodes,the humidity was found to significantly influence the intensity of microdischarges at interfaces.Charge generation from microdischarges at the interfaces substantially increased with increasing humidity.For an electric field of 5 kV/mm that were applicable to the dimensioning of gas-insulated devices,humidity strongly influences the charge provision from technically rough interfaces and potentially contributes to the surface-charge accumulation at insulator surfaces.On the other hand,for low-field conduction phenomena,no increase in the ion currents from natural ionisation or electrophoretic conduction was observed.For the investigated range of parameters,humidity is expected to be highly relevant for the design of gas-insulated devices.

关键词： conduction humidity sulphur

来源：

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

Electroacupuncture improves neuronal function by stimulation of ascending peripheral nerve conduction in rats with spinal cord injury

引用

Journal of Traditional Chinese Medicine 2019年第4期39卷 509-515页

作者： Song Meng Chen Wu Kamiie Junichi Okuno Seiichi Orito Kensuke Laboratory of Physiology II School of Veterinary MedicineAzabu UniversityFuchinobeSagamiharaKanagawa 229-8501Japan Beijing Key Laboratory of Traditional Chinese Veterinary Medicine Beijing University of AgricultureBeijing 102202China Laboratory of Pathology School of Veterinary MedicineAzabu UniversityFuchinobeSagamiharaKanagawa 229-8501Japan Veterinary Clinic of Neurology 892-1 Tanaka-machiIsesakiGunma 372-0814Japan

OBJECTIVE: To establish a method of transient sciatic nerve blockade and to examine the involvement of the ascending peripheral nerve pathway in the therapeutic effect of electroacupuncture at Zusanli(ST 36) in rats with spinal cord injury(SCI).METHODS: We examined the transient effect of daily lidocaine administration into the posteromedial part of the greater trochanter on sciatic nerve function using electrophysiological examination and histopathology of the sciatic nerve. Rats were divided into three groups: an SCI group(SCI without treatment), an SCI with electroacupuncture treatment(SCI-EA) group, and an SCI with nerve block and electroacupuncture(SCI-NB-EA) group(nerve block was achieved by lidocaine administration to transiently block the ascending peripheral nerve pathway). Behavioral tests and electrophysiological examinations were performed to evaluate recovery of neurological function.RESULTS: Sciatic nerve conduction was normal immediately before daily lidocaine administration.Histopathological analysis also indicated normal sciatic nerve, confirming that lidocaine nerve blockade was suitable and reversible for transiently eliminating nerve transmission. Neurological function in the SCI-EA group was superior to that in the SCI group, while no differences were found between the SCI and SCI-NB-EA groups.CONCLUSION: Electroacupuncture treatment can promote recovery of neurological function. Facilitation of nerve conduction may play an important role in this recovery.

关键词： Electroacupuncture Spinal cord injuries Nerve conduction Electrophysiology Lidocaine

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

A Virtual Boundary Element Method for Three-Dimensional Inverse Heat conduction Problems in Orthotropic Media

引用

Computer Modeling in Engineering & Sciences 2018年第11期117卷 189-211页

作者： Xu Liu Guojian Shao Xingxing Yue Qingbin Yang Jingbo Su College of Mechanics and Materials Hohai UniversityNanjing211100China School of Material Science and Engineering Nanjing University of Science&TechnologyNanjing210094China State Key Laboratory of Operation and Control of Renewable Energy&Storage Systems China Electric Power Research InstituteBeijing100192China College of Harbour Coastal and Offshore EngineeringHohai UniversityNanjing210098China.

This paper aims to apply a virtual boundary element method(VBEM)to solve the inverse problems of three-dimensional heat conduction in orthotropic media.This method avoids the singular integrations in the conventional boundary element method,and can be treated as a potential approach for solving the inverse problems of the heat conduction owing to the boundary-only discretization and semi-analytical algorithm.When the VBEM is applied to the inverse problems,the numerical instability may occur if a virtual boundary is not properly chosen.The method encounters a highly illconditioned matrix for the larger distance between the physical boundary and the virtual boundary,and otherwise is hard to avoid the singularity of the source point.Thus,it must adopt an appropriate regularization method to deal with the ill-posed systems of inverse problems.In this study,the VBEM and different regularization techniques are combined to model the inverse problem of three-dimensional heat conduction in orthotropic media.The proper regularization techniques not only make the virtual boundary to be allocated freer,but also solve the ill-conditioned equation of the inverse problem.Numerical examples demonstrate that the proposed method is efficient,accurate and numerically stable for solving the inverse problems of three-dimensional heat conduction in orthotropic media.

关键词： Virtual boundary element method Tikhonov regularization threedimensional heat conduction inverse problem orthotropic media.

来源：

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

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：