检索结果-南通市图书馆

激光腔内闭合术联合泡沫硬化剂注射治疗下肢静脉曲张短期疗效观察

在线全文

学校读者我要写书评

暂无评论

四川生理科学杂志 2024年第10期46卷 2151-2153,2157页

作者：艾锦江冯康康邱斌广昌县人民医院普外科江西抚州344900

目的:观察激光腔内闭合术联合泡沫硬化剂注射治疗下肢静脉曲张短期效果的评估。方法:选取我院特定时段内收治的66例下肢静脉曲张患者进行研究,根据不同治疗方式分为3组,各为22例,观察组采用激光腔内闭合术联合泡沫硬化剂注射治疗,参照1... 详细信息

目的:观察激光腔内闭合术联合泡沫硬化剂注射治疗下肢静脉曲张短期效果的评估。方法:选取我院特定时段内收治的66例下肢静脉曲张患者进行研究,根据不同治疗方式分为3组,各为22例,观察组采用激光腔内闭合术联合泡沫硬化剂注射治疗,参照1组采用激光腔内闭合术进行治疗,参照2组采用泡沫硬化剂注射剂进行治疗;对比3组临床治疗效果、并发症、病人满意度、术后1 y内复发率的差异。结果:观察组临床治疗效果均高于参照1组、参照2组(Py内患者复发率均低于参照1组、参照2组,各项数据比较,差异具有统计学意义(Py内的复发率低,可推广应用。

关键词：激光腔内闭合术泡沫硬化剂注射下肢静脉曲张疗效术后1年复发率

Electrochemical　Oxidation　of　Hydrazines　at　a　4-Pyridyl　Hydroquinone　Modified　Electrode

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 1998年第1期14卷 90-92页

作者： Niu, Li you, Tian-yan John, y. Gui Dong, Shao-jun Wang, Er-kang Chinese Acad Sci Changchun Inst Appl Chem Electroanalyt Chem Lab Changchun 130022 Peoples R China

ＥｌｅｃｔｒｏｃｈｅｍｉｃａｌＯｘｉｄａｔｉｏｎｏｆＨｙｄｒａｚｉｎｅｓａｔａ４－ＰｙｒｉｄｙｌＨｙｄｒｏｑｕｉｎｏｎｅＭｏｄｉｆｉｅｄＥｌｅｃｔｒｏｄｅＮＩＵＬｉ，ＹＯＵＴｉａｎ－ｙａｎ，ＪｏｈｎＹ．Ｇｕｉ，ＤＯＮ... 详细信息

ＥｌｅｃｔｒｏｃｈｅｍｉｃａｌＯｘｉｄａｔｉｏｎｏｆＨｙｄｒａｚｉｎｅｓａｔａ４－ＰｙｒｉｄｙｌＨｙｄｒｏｑｕｉｎｏｎｅＭｏｄｉｆｉｅｄＥｌｅｃｔｒｏｄｅＮＩＵＬｉ，ＹＯＵＴｉａｎ－ｙａｎ，ＪｏｈｎＹ．Ｇｕｉ，ＤＯＮＧＳｈａｏ－ｊｕｎ，ＷＡＮＧＥｒ－...

关键词： Oxidation Hydrazines Electrochemical Electrode

三维超声血管斑块定量分析在颈动脉斑块性质诊断与评估中的临床价值研究

在线全文

学校读者我要写书评

暂无评论

科技与健康 2024年第10期3卷 9-12页

作者：康佳沙晓溪康彧何兰芳成都中医药大学附属医院超声科四川成都610075

探讨三维超声血管斑块定量分析技术在颈动脉斑块性质诊断与评估中的临床价值。选取2022年1月—2023年1月于成都中医药大学附属医院就诊的85例颈动脉斑块患者作为研究对象。所有患者均接受三维超声血管斑块定量分析技术检查以及颈动脉CT... 详细信息

探讨三维超声血管斑块定量分析技术在颈动脉斑块性质诊断与评估中的临床价值。选取2022年1月—2023年1月于成都中医药大学附属医院就诊的85例颈动脉斑块患者作为研究对象。所有患者均接受三维超声血管斑块定量分析技术检查以及颈动脉CTA检查,以CTA检查结果作为金标准,明确颈动脉狭窄程度、声像图特征以及斑块性质情况。结果显示,不同狭窄程度患者NWI比较,差异有统计学意义(P0.05)。研究发现,三维超声血管斑块定量分析技术在评估颈动脉狭窄程度以及斑块性质方面具有较高的准确性,能够对相关指标进行量化分析,该检查方案无创、方便、快捷,具有临床应用及推广价值。

关键词：三维超声血管斑块定量分析技术颈动脉CTA 颈动脉斑块性质颈动脉狭窄程度

基于超椭球Markov的列车控制中心剩余使用寿命预测

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

铁路计算机应用 2024年第2期33卷 67-73页

作者：王康齐金平嘉兴职业技术学院智能制造学院嘉兴314036 兰州交通大学机电技术研究所兰州730070

为研究设备可用度对列车控制中心(TCC,Train Control Center)的影响和预测TCC的剩余使用寿命(RUL,Remaining Useful Life),降低TCC的故障发生率,确保车辆安全运行,构建TCC动态故障树模型。通过引入Markov理论,将其转化为Markov模型,设计... 详细信息

为研究设备可用度对列车控制中心(TCC,Train Control Center)的影响和预测TCC的剩余使用寿命(RUL,Remaining Useful Life),降低TCC的故障发生率,确保车辆安全运行,构建TCC动态故障树模型。通过引入Markov理论,将其转化为Markov模型,设计了TCC可用度评估与RUL预测方法;考虑了TCC的失效率和共因失效,利用D-S(Dempster-Shafer)证据理论对失效数据作数据融合处理,得到TCC设备初始故障区间概率;在此基础上,采用超椭球模型约束设备初始故障区间概率,得到更加精确的底事件故障区间概率;画出Markov状态转移图,用矩阵推导出TCC可用度和RUL的函数关系式,且对可用度的计算还考虑了维修因素。以兰州—乌鲁木齐客运专线某TCC数据作为分析案例,用该方法计算TCC及其各设备的可用度,并预测TCC的RUL。结果表明:与通用方法相比,评估结果相同,但评估信息更丰富。

关键词：列车控制中心可用度剩余使用寿命(RUL) Markov 超椭球模型证据理论

基于贝叶斯自优化Bi-LSTM组合网络的高速铁路轨道-桥梁系统震后响应预测方法

在线全文

学校读者我要写书评

暂无评论

Journal of Central South University 2024年第3期31卷 965-975页

作者：彭康蒋丽忠周旺保余建向平吴凌旭 National Engineering Research Center of High-speed Railway Construction Technology Central South UniversityChangsha 410075China

中国高速铁路(HSR)规划建设逐渐向地震易发地区延伸,亟需一种及时、准确的灾后地震响应快速预测方法,以实现高速铁路系统运输生命线安全的快速评估。本文提出了一种基于贝叶斯自优化双向长短期记忆(Bi-LSTM)网络的快速预测方法,以经过... 详细信息

中国高速铁路(HSR)规划建设逐渐向地震易发地区延伸,亟需一种及时、准确的灾后地震响应快速预测方法,以实现高速铁路系统运输生命线安全的快速评估。本文提出了一种基于贝叶斯自优化双向长短期记忆(Bi-LSTM)网络的快速预测方法,以经过实验验证的高速铁路轨道-桥梁系统有限元模型地震动响应计算数据为样本,将预测地震响应和有限元计算结果进行比较,验证所提方法的精度和鲁棒性,表明该方法在预测高速铁路桥梁结构的非线性地震反应方面是有效的,且高速铁路轨道-桥梁系统的不同预测位置对预测精度的影响不明显;此外,为了降低神经网络训练数据量需求,提出了一种基于离散小波分解的分层聚类算法,结果表明,基于小波分解的分层聚类方法在保证预测精度的同时,有效地减少了训练地震集的输入数量。

关键词：高速铁路轨道-桥梁系统贝叶斯优化 Bi-LSTM神经网络离散小波分解聚类分析

Erratum to: Bimetallic clusters confined inside silicalite-1 for stable propane dehydrogenation

在线全文

学校读者我要写书评

暂无评论

Nano Research 2024年第4期17卷 3423-3423页

作者： Xueer Wei Jiawei Cheng yubing Li kang Cheng Fanfei Sun Qinghong Zhang ye Wang State Key Laboratory of Physical Chemistry of Solid Surfaces Collaborative Innovation Center of Chemistry for Energy MaterialsCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province(IKKEM) Xiamen 361005China Shanghai Synchrotron Radiation Facility Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201800China Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201204China

Erratum to Nano Research,2023,16(8):10881–10889 https://***/10.1007/s12274-023-5953-y The equal contribution symbols were unfortunately *** of Xueer Wei1,Jiawei Cheng1,yubing Li1,kang Cheng1,2(✉),Fanfei Sun3,4(✉),Qinghong Zhang1(✉),and ye Wang1,21 State Key Laboratory of Physical Chemistry of Solid Surfaces,Collaborative Innovation Center of Chemistry for Energy Materials,College of Chemistry and Chemical Engineering,Xiamen University,Xiamen 361005,China 2 Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province(IKKEM),Xiamen 361005,China 3 Shanghai Synchrotron Radiation Facility,Shanghai Advanced Research Institute,Chinese Academy of Sciences,Shanghai 201800,China 4 Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201204,China.

关键词： Xiamen confined China

Robust Multiscale Iterative Solvers for Nonlinear Flows in Highly Heterogeneous Media

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Numerical Mathematics(Theory,Methods and Applications) 2012年第3期5卷 359-383页

作者： y.Efendiev J.Galvis S.Ki kang R.D.Lazarov Department of Mathematics TAMUCollege StationTexas77843USA

In this paper,we study robust iterative solvers for finite element systems resulting in approximation of steady-state Richards’equation in porous media with highly heterogeneous conductivity *** is known that in such cases the contrast,ratio between the highest and lowest values of the conductivity,can adversely affect the performance of the preconditioners and,consequently,a design of robust preconditioners is important for many practical *** proposed iterative solvers consist of two kinds of iterations,outer and inner *** iterations are designed to handle nonlinearities by linearizing the equation around the previous solution *** a result of the linearization,a large-scale linear system needs to be *** linear system is solved iteratively(called inner iterations),and since it can have large variations in the coefficients,a robust preconditioner is ***,we show that under some assumptions the number of outer iterations is independent of the ***,based on the recently developed iterative methods,we construct a class of preconditioners that yields convergence rate that is independent of the ***,the proposed iterative solvers are optimal with respect to the large variation in the physical *** the same preconditioner can be reused in every outer iteration,this provides an additional computational savings in the overall solution *** tests are presented to confirm the theoretical results.

关键词： FE method nonlinear permeability highly heterogeneous media high contrast media

Influence of baffle position on liquid sloshing during braking and turning of a tank truck

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2010年第5期11卷 317-324页

作者： Ning kang Kui LIU School of Transportation Science and Engineering University of A eronautics and Asttvnautics Beijing 100191 China

The influence of baffle position on liquid sloshing during the braking and turning of a tank truck was studied using a volume of fluid (VOF) model. The forces,their positions and weight distribution during braking and the forces and rolling moment during turning were calculated. The reliability of the calculation method was validated by comparisons with experimental results. The results showed that during braking,liquid splashes in the tank and the maximum forces and G (the ratio of weight acting on the front axle to the rear axle) are large when A (the ratio of the arch area above the baffle to the area of cross section)≤0.1. When A≥0.2,as the position of the baffle is lowered,the maximum of Fx (the force in direction x) first decreases then increases,and the maximum of Fy (the force in direction y) and G increase. During turning,liquid splashes in the tank and the maximum forces and M (the rolling moment) are large when D (the ratio of the arch area above the baffle to the area of cross section)≤0.2. When D≥0.3,as the position of the baffle is lowered,the maximums of Fy,Fz (the force in direction z) and M increase.

关键词： Tank truck Volume of fluid (VOF) method Liquid sloshing Two phase flow Baffle

EXTRUSION DIE CAE OF THE STEEL REINFORCED PLASTIC PIPE

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2004年第3期17卷 303-306页

作者： W.Q.Ma H.y.Sun D.C.kang K.D.Zhao Harbin Institute of Technology Harbin 150001 China Daqing Oilfield Postdoctoral Workstation Daqing 163453 ChinaHarbin University of Science and Technology Harbin 150080 China Daqing Oilfield Postdoctoral Workstation Daqing 163453 ChinaHarbin Institute of Technology Harbin 150001 ChinaHarbin Institute of Technology Harbin 150001 China

The steel reinforced plastic pipe is a new kind of pressure pipe. It is made up with steelwires and plastic. Because reinforced skeleton of the steel wire increase the complexityof plastic flow during the extrusion phase, the traditional design criteria of extrusiondie is not suitable. The study on extrusion die of the kind of pipe is very importantstep in produce development. Using finite element (FE) method in this paper, theflow rule of molten plastic inside the die has been predicted and a groap of optimalstructural parameters was obtained. These results are helpful for reducing the designcycle and improve the quality of the final product.

关键词： steel reinforced plastic pipe extrusion die computer aid engineering(CAE)