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中国现代医生 2014年第24期52卷 137-139页

作者：蒋柏枫湖南省永州市中心医院北院心内科湖南永州425000

目的：通过颈动脉超声和冠脉造影对粥样板块和颈动脉硬化级别对比，探讨颈动脉超声在冠心病诊断中的价值。方法对我院2010年1月~2013年12月间收治且经冠脉造影检查确诊为冠心病患者108例，另选30例健康体检者进行对比研究。收集冠脉造... 详细信息

目的：通过颈动脉超声和冠脉造影对粥样板块和颈动脉硬化级别对比，探讨颈动脉超声在冠心病诊断中的价值。方法对我院2010年1月~2013年12月间收治且经冠脉造影检查确诊为冠心病患者108例，另选30例健康体检者进行对比研究。收集冠脉造影检查数据，并对所有患者行颈动脉超声检查，观察粥样斑块数量、颈动脉硬化级别、IMT。结果两种检查粥样斑块数量、颈动脉硬化级别同组间对比差异不显著（P〉0.05）；不同组别同种检查粥样斑块数量、颈动脉硬化级别对比，均存在显著差异（P〈0.05）。以冠脉造影检查为金标准，颈动脉超声诊断IMT敏感度为86.58%，特异性为61.54%，诊断符合率为80.56%；颈动脉超声诊断粥样斑块敏感度为89.66%，特异性为57.14%，诊断符合率为83.33%。结论颈动脉超声可作为临床预测冠心病检查，缺乏数据依据，应加强两者间数据关系研究，以提高确诊率，相信随着研究的不断深入，定可作为无创、准确的冠心病检查方法。

关键词：颈动脉超声冠脉造影诊断

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临床带教老师对本科护生实习积极性影响的分析

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中国临床护理 2016年第1期8卷 71-72,79页

作者：张琼王芸华中科技大学同济医学院附属同济医院综合科武汉430030

目的分析临床带教老师对本科护生实习积极性的影响。方法采用自编问卷对150名本科实习护生进行问卷调查。结果本科护生实习积极性处于中等偏低水平。影响本科护生实习积极性的因素依次为师生关系融洽度、带教方法、工作认可度、带教老... 详细信息

目的分析临床带教老师对本科护生实习积极性的影响。方法采用自编问卷对150名本科实习护生进行问卷调查。结果本科护生实习积极性处于中等偏低水平。影响本科护生实习积极性的因素依次为师生关系融洽度、带教方法、工作认可度、带教老师专业水平、带教老师素质等。结论提高临床带教老师对带教工作的认识,从个人素质、专业知识水平、带教管理、带教方法等方面改进,同时加强师生的沟通、协调能力,及时反馈,可提高护理本科生实习的积极性。

关键词：临床带教学生,护理实习积极性

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An Adaptive Load Stepping Algorithm for Path-Dependent Problems Based on Estimated Convergence Rates

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Computer Modeling in Engineering & Sciences 2017年第3期113卷 325-342页

作者： M.T.C.Araújo Fernandes C.O.Cardoso w.J.Mansur Civil Engineering Department/COPPE/Federal University of Rio de Janeiro Ilha do FundaoP.B.6850621945-970 Rio de JaneiroRJBrazil Petrobras/Cenpes Av.Horácio Macedo950Ilha do Fundao21941-915 Rio de JaneiroRJBrazil Civil Engineering Department/COPPE/Federal University of Rio de Janeiro Ilha do FundaoP.B.6850621945-970 Rio de JaneiroRJBrazil

A new adaptive(automatic)time stepping algorithm,called RCA(Rate of Convergence Algorithm)is *** new algorithm was applied in nonlinear finite element analysis of path-dependent *** step size is adjusted by monitoring the estimated convergence rate of the nonlinear iterative *** RCA algorithm is relatively simple to implement,robust and its performance is comparable to,and in some cases better than,the automatic load incrementaion algorithm existent in commercial *** about the convergence rate of nonlinear iterative processes,an estimation of the rate and a study of the parameters of the RCA algorithm are *** show the capacity of the algorithm to adjust the increment size,detailed discussions based on results for different limit load analyses are *** results obtained by RCA algorithm are compared with those by ABAQUS?,one of the most powerful nonlinear FEA(Finite Element Analysis)commercial software,in order to verify the capability of RCA algorithm to adjust the increment size along nonlinear analyses.

关键词： Rate of convergence nonlinear automatic load incrementation limit load

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THE INVESTIGATION ON PLASMA ARC TREATMENT OF CHROMIUM PLATED ALLOY STRUCTURE STEEL

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Acta Metallurgica Sinica(English Letters) 2005年第3期18卷 289-294页

作者： X.M.Fan J.w.Huang K.H.wang Q.Liu DepartmentofMaterialsScienceandEngineering NanjingUniversityofScienceandTechnologyNanjing210094China

The technology of plasma arc was used to modify the interface adhesion between c hromium coating and steel substrate. The interface microstructure was studied as a function of plasma arc processing parameters. Microstructure analysis was per formed by optical microscopy, scanning electron microscopy and electron probe. T he microhardness distribution along the depth of a cross-section of the chromium coating and the substrate was measured. The results show the energy density of transferred plasma arc is obviously higher than plasma non-transferred arc. The molten interface was obtained by plasma transferred arc. Interfaces between chro mium coating and steel substrate can be divided by plasma non-transferred arc in to three classes: non-molten, a little molten and molten. Good interface bonding was obtained by proper process parameters. The microhardness of chromium coatin g decreases with increasing energy density of plasma arc.

关键词： plasma transferred arc plasma non-transferred arc coating hard-

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Effects of Combined Heat and Mass Transfer on Entropy Generation due to MHD Nanofluid Flow over a Rotating Frame

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Computers, Materials & Continua 2021年第1期66卷 575-587页

作者： F.Mabood T.A.Yusuf A.M.Rashad w.A.Khan Hossam A.Nabwey department of information technology fanshawe college londononn5y 5r6canada department of mathematics university of ilorinilorinkwara240003nigeria department of mathematics faculty of scienceaswan universityaswan81528egypt department of mechanical engineering college of engineeringprince mohammad bin fahd universityal khobar31952saudi arabia department of mathematics college of science and humanities in al-kharjprince sattam bin abdulaziz universityal-kharj11942saudi arabia department of basic engineering science faculty of engineeringmenoufia universityshebin el-kom32511egypt

The current investigation aims to explore the combined effects of heat and mass transfer on free convection of Sodium alginate-Fe_(3)O_(4) based Brinkmann type nanofluid flow over a vertical rotating *** Tiwari and Das nanofluid model is employed to examine the effects of dimensionless numbers,including Grashof,Eckert,and Schmidt numbers and governing parameters like solid volume fraction of nanoparticles,Hall current,magnetic field,viscous dissipation,and the chemical reaction on the physical *** dimensionless nonlinear partial differential equations are solved using a finite difference method known as Runge-Kutta Fehlberg(RKF-45)*** variation of dimensionless velocity,temperature,concentration,skin friction,heat,and mass transfer rate,as well as for entropy generation and Bejan number with governing parameters,are presented graphically and are provided in tabular *** results reveal that the Nusselt number increases with an increase in the solid volume fraction of ***,the rate of entropy generation and Bejan number depends upon the magnetic field and the Eckert number.

关键词： Nanofluid flow entropy generation heat and mass transfer viscous dissipation chemical reaction

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Prediction of Postbuckling Characteristics of Perforated Metamaterial Cylindrical Shells Under Axial Compression

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Acta Mechanica Solida Sinica 2023年第3期36卷 428-442页

作者： Xueqing Cao Jianyi Guo Yongqi Li Qifeng Zhang Zhenhuan Zhou Jiabin Sun Xinsheng Xu C.w.Lim State Key Laboratory of Structural Analysis for Industrial Equipment and School of Ocean Science and Technology Dalian University of TechnologyPanjin 124221China AVIC Jonhon Optronic Technology Co. Ltd.Luoyang 471003China State Key Laboratory of Structural Analysis for Industrial Equipment and Department of Engineering Mechanics Dalian University of TechnologyDalian 116024China Department of Architecture and Civil Engineering City University of Hong KongTat Chee AvenueKowloonHong KongChina

Large deflection postbuckling responses of metamaterial cylindrical shells perforated by arrayed circular holes are investigated through a newly proposed theoretical model incorporating with finite element method and *** triggering of an unusual pattern transformation under compressive load(that shows special hyperelastic metamaterial characteristics)contributes to the particularity of the postbucklingmodes,in which the axisymmetric waisted and non-axisymmetric postbuckling configurations of perforated cylindrical shells are *** transformations of postbucking modes are mainly affected by global outline sizes of the shell and local geometrical parameters of *** structural load-carrying capacity for the waisted postbuckling response suffers a sudden drop and recovers when the holes ***,the shell would undergo a sustained fall off under non-axisymmetric postbuckling *** negative Poisson’s ratio induced by pattern transformation plays a key role and a critical effective threshold value exists,inducing the waisted postbuckling *** revealed principles would be of benefit for achieving a controllable structural stability that is usually difficult to implement on those conventional structures.

关键词： Cylindrical shell Negative Poisson’s ratio Postbuckling waisted deformation

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