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早期心脏康复护理干预对急性心肌梗死PCI术后患者心功能及运动耐力的影响

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临床医学工程 2024年第2期31卷 213-214页

作者：石建克樊相南平顶山市第二人民医院心血管内科三病区河南平顶山467000

目的探讨早期心脏康复护理干预在急性心肌梗死经皮冠状动脉介入(PCI)术后患者中的应用效果。方法 60例行PCI治疗的急性心肌梗死患者随机分为两组各30例。术后,对照组采用常规康复护理干预,观察组采用早期心脏康复护理干预。比较两组的... 详细信息

目的探讨早期心脏康复护理干预在急性心肌梗死经皮冠状动脉介入(PCI)术后患者中的应用效果。方法 60例行PCI治疗的急性心肌梗死患者随机分为两组各30例。术后,对照组采用常规康复护理干预,观察组采用早期心脏康复护理干预。比较两组的心功能指标、运动耐力以及心脏不良事件。结果干预后,观察组的LVEF显著高于对照组,LVESD、 LVEDD均显著低于对照组,6MWT显著长于对照组(P <0.05)。观察组的心脏不良事件总发生率为6.67%,显著低于对照组的30.00%(P <0.05)。结论早期心脏康复护理干预能够显著改善急性心肌梗死PCI术后患者的心功能,提高其运动耐量,减少其心脏不良事件的发生。

关键词：急性心肌梗死经皮冠状动脉介入早期心脏康复护理干预心功能运动耐力

4D打印磁响应形状记忆环氧树脂基复合材料制备与性能

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复合材料学报 2024年第3期41卷 1226-1234页

作者：邓攀吴志孙纪烨鲁麟蛟单熠莲杜建科张明华宁波大学机械工程与力学学院宁波315211

以环氧树脂(EP51)为基体,乙炔炭黑(ACB)和镍粉(Ni)为填料,聚醚多元醇(PPG)为增韧剂共混制成打印墨水,利用直写3D打印机制备ACB-Ni/EP51复合材料。通过流变仪、直写3D打印机对墨水的流变性能和可打印性进行表征;通过拉力实验机(UTM)、扫... 详细信息

以环氧树脂(EP51)为基体,乙炔炭黑(ACB)和镍粉(Ni)为填料,聚醚多元醇(PPG)为增韧剂共混制成打印墨水,利用直写3D打印机制备ACB-Ni/EP51复合材料。通过流变仪、直写3D打印机对墨水的流变性能和可打印性进行表征;通过拉力实验机(UTM)、扫描电镜(SEM)、动态热机械分析仪(DMA)、差示扫描量热仪(DSC)对材料力学性能、微观形貌、动态力学性能、差热性能和形状记忆效应进行表征,探究了填料含量对墨水和材料性能的影响。结果表明:ACB含量达到12wt%时,墨水具有良好的可打印性;当Ni粉含量达到16wt%时,打印针头堵塞造成打印不连续、不均匀。固化后生成的“海岛”增韧结构使材料拉伸强度明显提高(60 MPa以上)。随着Ni粉含量增加,对拉伸强度的影响由促进变为削弱。当Ni粉含量从6wt%增加至14wt%,形状固定率(R_(f))从99.4%降至94.2%。在300 kHz交变磁场作用下,形状发生回复,Ni粉含量增加使形状回复率(R_(r))和回复速率升高,Rr从94.8%提升至99.1%,回复时间从39 s缩短至17 s。Ni-ACB/EP51复合材料具有较好的形状记忆性能,在空间可展开结构、驱动器及4D打印等方面有一定的应用前景。

关键词： 4D打印环氧树脂形状记忆聚合物磁响应直写打印增韧

A two-dimensional analysis of surface acoustic waves in finite elastic plates with eigensolutions

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Science China(Physics,Mechanics & Astronomy) 2007年第5期50卷 631-649页

作者： WANG Ji DU jianke PAN QiaoQiao Piezoelectric Device Laboratory Department of Mechanics and Engineering Science School of Engineering Ningbo University Ningbo 315211 China Piezoelectric Device Laboratory Department of Mechanics and Engineering Science School of Engineering Ningbo University Ningbo 315211 China Piezoelectric Device Laboratory Department of Mechanics and Engineering Science School of Engineering Ningbo University Ningbo 315211 China

It is generally known that surface acoustic waves, or Rayleigh waves, have different mode shapes in infinite plates. To be precise, there are both exponentially decaying and growing components in plates appearing in pairs, representing symmetric and antisymmentric modes in a plate. As the plate thickness increases, the combined modes will approach the Rayleigh mode in a semi-infinite solid, exhibiting surface acoustic wave deformation and velocity. In this study, the two-dimensional theory for surface acoustic waves in finite plates is extended to include the exponentially growing modes in the expansion function. With these extra equations, we study the surface acoustic waves in a plate with different thickness to examine the coupling of the exponentially decaying and growing modes. It is found that for small thick- ness, the two groups of waves are strongly coupled, showing the significance of including the effect of thickness in analysis. As the thickness increases to certain values, such as more than five wavelengths, the exponentially decaying modes alone will be able to predict vibrations of surface acoustic wave modes accurately, thus simplifying the equations and solutions significantly.

关键词： surface, acoustic, waves, Rayleigh, propagation, plate, velocity, vibration, resonator

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某中医医院高血压患者住院费用结构分析

中国医院 2024年第7期28卷 53-56页

作者：梁丽军吴瑞张雪任建柯王昕天津中医药大学管理学院天津市301617

目的:研究考虑患者异质性的中医医院高血压患者病例组合方式,分析不同类型患者住院费用水平及结构变动情况,为合理监管中医医院高血压患者住院费用以及提高医疗效率提供依据。方法:收集某中医三甲医院1150例高血压患者相关数据,通过单... 详细信息

目的:研究考虑患者异质性的中医医院高血压患者病例组合方式,分析不同类型患者住院费用水平及结构变动情况,为合理监管中医医院高血压患者住院费用以及提高医疗效率提供依据。方法:收集某中医三甲医院1150例高血压患者相关数据,通过单因素和多元线性回归分析确定住院费用关键影响因素,采用决策树模型对高血压患者进行分类,运用新灰色关联分析法和结构变动度法对不同类别患者住院费用结构进行分析。结果:患者年龄、是否合并心脑血管疾病、合并症或并发症个数是影响中医医院高血压患者住院费用的主要因素;采用决策树模型对患者分组,形成5类患者组合,从I类到V类患者费用明显增加,变动度为39.33%;关联度分析结果显示诊断类费用、治疗类费用、西药类费用是引起总费用变动的主要项目,中药类费用和中医类费用分别排在第5位和第7位。结构变动贡献率位居前两位的是诊断类费用(41.23%)和西药类费用(34.58%),二者累计贡献率达到75.81%。结论:中医高血压患者的分组效果显著,能够反映不同类型患者的医疗资源消耗情况。影响住院费用结构的因素主要是诊断类和西药类费用,中医类、中药类费用贡献率偏低,可为中医医院DRG分组、采取差异化费用管理、提高医疗资源效率等提供参考依据。

关键词：中医医院住院费用高血压决策树模型结构变动度

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Interaction between bending and mobile charges in a piezoelectric semiconductor bimorph

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Applied Mathematics and Mechanics(English Edition) 2022年第8期43卷 1171-1186页

作者： Lei YANG jianke DU J.S.YANG Smart Materials and Advanced Structures Laboratory School of Mechanical Engineering and MechanicsNingbo UniversityNingboZhejiang Province315211China Office of Human Resources Taizhou UniversityTaizhouZhejiang Province318000China Department of Mechanical and Materials Engineering University of Nebraska-LincolnLincolnNE68588-0526USA

We study the bending of a two-layer piezoelectric semiconductor plate(bimorph).The macroscopic theory of piezoelectric semiconductors is employed.A set of two-dimensional plate equations is derived from the three-dimensional *** plate equations exhibit direct couplings among bending,electric polarization along the plate thickness,and mobile *** the case of pure bending,a combination of physical and geometric parameters is identified which characterizes the strength of the interaction between the mechanical load and the distribution of mobile *** the bending of a rectangular plate under a distributed transverse mechanical load,it is shown that mobile charge distributions and potential barriers/wells develop in the *** the mechanical load is local and self-balanced,the induced carrier distributions and potential barriers/wells are also localized near the loading *** results are fundamentally useful for mechanically manipulating mobile charges in piezoelectric semiconductor devices.

关键词： piezoelectric plate bimorph bending piezotronic

Love wave propagation in layered magneto- electro-elastic structures

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Science China(Physics,Mechanics & Astronomy) 2008年第6期51卷 617-631页

作者： DU jianke JIN XiaoYing WANG Ji Department of Mechanics and Engineering Science School of EngineeringNingbo UniversityNingbo 315211China

An analytical approach was taken to investigate Love wave propagation in a layered magneto-electro-elastic structure, where a piezomagnetic (or piezoelectric) mate-rial thin layer was bonded to a semi-infinite piezoelectric (or piezomagnetic) sub-strate. Both piezoelectric and piezomagnetic ceramics were polarized in the anti-plane (z-axis) direction. The analytical solution of dispersion relations was obtained for magneto-electrically open and short boundary conditions. The phase velocity, group velocity, magneto-electromechanical coupling factor, electric po-tential, and magnetic potential were calculated and discussed in detail. The nu-merical results show that the piezomagnetic effects have remarkable effect on the propagation of Love waves in the layered piezomagnetic/piezoelectric structures.

关键词： Love waves magneto-electro-elastic dispersion relation magnetic potential

A theoretical model for the intrusion of the Kuroshio across the continental shelf of East China Sea

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Science China Earth Sciences 2015年第12期58卷 2289-2295页

作者： ZHANG QingHua QU YuanYuan LI jianke YIN XunQiang Key Laboratory of Marine Science and Numerical Modeling The First Institute of OceanographyState Oceanic Administration Marine Services Digital Globe Inc.

Here we use a two-layer model to study the dynamics of the intrusion of the Kuroshio onto the continental shelf. Results show that the interaction of the Kuroshio water and shelf water produces a stable upwelling zone above 100 m depth northeast of Talwan, which provides a dynamical explanation to the presence of the cold core previously observed by satellite. The affected shelf water from the interaction has an onshore portion, which turns right and becomes a northward alongshore flow when it moves closer to shore. This implies that the Kuroshio water cannot penetrate deep onto the inner part of the continental shelf, but it generates a strong northward jet that is formed mainly by the shelf water.

关键词： Kuroshio continental shelf upwelling alongshore flow stratification

An Analysis of Piezomagnetic-Piezoelectric Semiconductor Unimorphs in Coupled Bending and Extension under a Transverse Magnetic Field

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Acta Mechanica Solida Sinica 2021年第5期34卷 743-753页

作者： Lei Yang jianke Du Ji Wang Jiashi Yang Piezoelectric Device Laboratory School of Mechanical Engineering and MechanicsNingbo UniversityNingbo315211China Department of Mechanical and Materials Engineering The University of Nebraska-LincolnLincolnNE68588-0526USA

We study the response of a composite beam(unimorph)with a piezomagnetic layer and a piezoelectric semiconductor layer under a transverse magnetic field.A one-dimensional model for coupled bending and extension of the beam is derived from the three-dimensional theory.A simple and analytical solution of the model is obtained,showing that various electromechanical fields develop in the beam through piezomagnetic and piezoelectric couplings as well as *** particular,the mobile charges in the semiconductor layer redistribute themselves under the magnetic field.A coupling coefficient is defined to describe the strength of this magneto-semiconduction *** effects of physical and geometric parameters on the fields and the coupling coefficient are *** results are fundamental to piezotronics when magnetic effects are involved.

关键词： Piezomagnetic Piezoelectric Semiconductor Unimorph

甘肃北山南部早古生代古亚洲洋俯冲作用:来自明舒井埃达克质侵入体锆石U-Pb年龄及地球化学的证据

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地质通报 2024年第2期43卷 376-389页

作者：王红杰白建科赵海波程龙朱黎宽郭峰中国地质科学院郑州矿产综合利用研究所/自然资源部高纯石英资源开发利用工程技术创新中心河南郑州450006 合肥工业大学资源与环境工程学院安徽合肥230009 中国地质调查局西宁自然资源综合调查中心青海西宁810000 陕西地矿区研院有限公司陕西咸阳712000

甘肃北山南部具有重要的构造位置与复杂的构造演化历史,制约着北山造山带大地构造归属研究。北山明舒井埃达克质侵入体位于南部辉铜山以西地区,岩性主要为二长花岗岩、正长花岗岩、花岗闪长岩、石英闪长岩等。对明舒井侵入体中的二长花... 详细信息

甘肃北山南部具有重要的构造位置与复杂的构造演化历史,制约着北山造山带大地构造归属研究。北山明舒井埃达克质侵入体位于南部辉铜山以西地区,岩性主要为二长花岗岩、正长花岗岩、花岗闪长岩、石英闪长岩等。对明舒井侵入体中的二长花岗岩、正长花岗岩和花岗闪长岩进行LA-ICP-MS锆石U-Pb测年,定年结果分别为423.4±3.4 Ma、425.4±2.3 Ma和437.8±3.5 Ma。岩石SiO2含量多数大于56%(55.53%~64.42%),Al2O3大于15%(15.1%~17.79%),MgO多数小于3%,全部小于6%(2.07%~3.5%),Y和Yb含量均较低,同时轻稀土元素富集,Eu异常不明显,Sr含量较高,具有与埃达克岩相似的特征。综合区域地质背景,认为北山南部志留纪埃达克质侵入岩形成于活动大陆边缘火山弧环境,可能是志留纪古亚洲洋向北消减俯冲背景下岩浆作用的产物,同时发生了大规模的地壳增生。明舒井埃达克质侵入岩体的识别为北山造山带早古生代构造演化提供了重要依据。

关键词：埃达克质侵入岩早古生代俯冲作用锆石U-Pb年龄甘肃北山地质调查工程