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Potential wells for classical acoustic waves

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Science China(Physics,Mechanics & Astronomy) 2014年第1期57卷 104-112页

作者： CHEN Shi LIN ShuYu mo runyang FU ZhiQiang Applied Acoustics Institute Shaanxi Normal University Shaanxi Key Laboratory of Ultrasound

The acceleration theorem of Bloch waves is utilized to construct random potential wells for classical acoustic waves in systems composed of alternating‘cavities’and‘couplers’.One prominent advantage of this method is these‘cavities’and‘couplers’are all monolayer *** allows forming more compact classical potential wells,which leads to the miniaturization of acoustic *** systematically investigate properties of harmonic,tangent,hyperbolic function,and square classical potential wells in quasi-periodic *** show these classical potential wells are analogues of quantum potential *** some technologies and concepts in quantum potential well fields may be generalized to classical acoustic wave *** addition,some abnormal cases regarding forming classical potential wells are also found.

关键词： classical potential wells phonon engineering acceleration theorem of Bloch waves localized eigenmodes

Dynamics of magnetic microbubble transport in blood vessels

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Chinese Physics B 2023年第9期32卷 293-303页

作者：陈杰王成会莫润阳 Institute of Shaanxi Key Laboratory of Ultrasonics Shaanxi Normal UniversityXi'an 710119China

Magnetic microbubbles(MMBs)can be controlled and directed to the target site by a suitable external magnetic field,and thus have potential in therapeutic drug-delivery ***,few studies focus on their dynamics in blood vessels under the action of magnetic and ultrasonic fields,giving little insight into the mechanism generated in diagnostic and therapeutic *** this study,equations of MMBs were established for simulating translation,radial pulsation and the coupled effect of ***,the acoustic streaming and shear stress on the vessel wall were also presented,which are associated with drug *** results suggest that the magnetic pressure increases the bubble pulsation amplitude,and the translation coupled with pulsation is manipulated by the magnetic force,causing retention in the target *** the bubbles approach the vessel wall,the acoustic streaming and shear stress increase with magnetic field *** responses of bubbles to a uniform and a gradient magnetic field were explored in this *** mathematical models derived in this work could provide theoretical support for experimental phenomena in the literature and also agree with the reported models.

关键词： magnetic microbubbles targeted drug delivery ultrasound magnetic field

Nonlinear oscillation characteristics of magnetic microbubbles under acoustic and magnetic fields

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Chinese Physics B 2022年第3期31卷 329-341页

作者： Lixia Zhao Huimin Shi Isaac Bello Jing Hu Chenghui Wang runyang mo Shaanxi Key Laboratory of Ultrasonics School of Physics and Information TechnologyShaanxi Normal UniversityXi'an 710119China Department of Chemistry Ahmadu Bello UniversityZaria 810001Nigeria

Microbubbles loaded with magnetic nanoparticles(MMBs) have attracted increasing interests in multimode imaging and drug/gene delivery and targeted therapy. However, the dynamic behaviors generated in diagnostic and therapeutic applications are not clear. In the present work, a novel theoretical model of a single MMB was developed, and the dynamic responses in an infinite viscous fluid were investigated under simultaneous exposure to magnetic and acoustic fields. The results showed that the amplitude reduces and the resonant frequency increases with the strength of the applied steady magnetic field and the susceptibility of the magnetic shell. However, the magnetic field has a limited influence on the oscillating. It is also noticed that the responses of MMB to a time-varying magnetic field is different from a steady magnetic field. The subharmonic components increase firstly and then decrease with the frequency of the magnetic field and the enhanced effect is related to the acoustic driving frequency. It is indicated that there may be a coupling interaction effect between the acoustic and magnetic fields.

关键词： magnetic microbubbles ultrasound magnetic field nonlinear oscillation

Effect of magnetic field on expansion of ferrofluid-encapsulated microbubble

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Chinese Physics B 2023年第6期32卷 316-322页

作者：杜芷玮李凡潘瑞琪莫润阳王成会 Shaanxi Key Laboratory of Ultrasonics Shaanxi Normal UniversityXi'an 710119China

Magnetic microbubbles(MMBs) have great potential applications in drug delivery and target therapy because they can be controlled by magnetic fields. In this paper, dynamic equations are derived by Lagrangian formalism and the behavior of MMBs subject to a combination field of magnetic and ultrasound field in an incompressible infinite fluid is analyzed numerically. The results show that the magnetic field can promote bubble expansion and hinder its translational motion,and both the enhancement and obstruction effects will weaken with the decrease of bubble size. The initial translational velocity has almost no effect on bubbles motion. Besides, the maximum expansion radius of MMBs increases with the ferrofluid shell thickness, while that of the common MBs is just the opposite. In addition, the periodic change of Levich viscous drag caused by the rebound leads to the step-like translational motion. Finally, the ferrofluid-shell model can be replaced by the model of non-magnetic microbubbles in magnetic liquid at high driving frequency.

关键词： magnetic microbubbles ultrasound magnetic field translational motion

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导电流体中气泡径向振动行为的磁场控制

声学学报 2018年第4期43卷 689-698页

作者：张舍莫润阳王成会陕西师范大学陕西省超声学重点实验室

液态金属中气泡行为是磁流体力学的重要方面。为对磁场条件下导电流体中气泡动力学行为作全面理解,基于磁流体动力学方法建立了磁场条件下导电流体中气泡径向振动的无量纲化动力学方程,数值研究了磁场对导电流体中气泡径向非线性振动稳... 详细信息

液态金属中气泡行为是磁流体力学的重要方面。为对磁场条件下导电流体中气泡动力学行为作全面理解,基于磁流体动力学方法建立了磁场条件下导电流体中气泡径向振动的无量纲化动力学方程,数值研究了磁场对导电流体中气泡径向非线性振动稳定性、泡内温度、泡内气压及液体空化阈值的影响。结果显示：磁场增强了气泡非线性振动的稳定性,随着磁场增强且当作用在泡上的电磁力与惯性力数量级可比时,气泡运动为稳定的周期性振动;同时,磁场引起泡内温度、泡内压力及液体空化阈值变化。研究表明,可用磁场调节和控制液态金属中气泡的运动使其满足工程应用需求。

关键词：气泡行为磁场控制导电流体径向振动振动稳定性磁流体力学非线性振动液态金属

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超声相控阵全聚焦成像算法比较分析

声学技术 2021年第1期40卷 71-76页

作者：张杰莫润阳陕西师范大学超声学重点实验室陕西西安710062

先进的成像算法推动了超声相控阵技术的发展,全聚焦方法(Total Focusing Method,TFM)是一种基于全矩阵捕获的虚拟聚焦后处理及缺陷图像重构算法。文章基于一维线阵相控阵纵波探头全矩阵数据模式,利用Matlab软件结合Field II自带开源函... 详细信息

先进的成像算法推动了超声相控阵技术的发展,全聚焦方法(Total Focusing Method,TFM)是一种基于全矩阵捕获的虚拟聚焦后处理及缺陷图像重构算法。文章基于一维线阵相控阵纵波探头全矩阵数据模式,利用Matlab软件结合Field II自带开源函数包编写了算法程序,比较了TFM和1/2矩阵方法成像效果并对缺陷分辨率影响因素进行分析,最后用标准试块对算法进行实验验证。仿真结果表明,TFM和1/2矩阵方法都能用于缺陷重构且效果无明显差异,激励脉冲的宽度和频率对图像分辨率影响较大;实验表明,1/2矩阵的成像方法虽可有效降低计算数据量,但同时也丢失了检测区边缘处缺陷的部分信息,因而成像效果较TFM稍差。

关键词：超声相控阵全矩阵捕获全聚焦算法 1/2矩阵方法

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超声聚焦探头缺陷检测能力探讨

无损检测 2000年第2期22卷 62-63页

作者：莫润阳空军工程学院西安710038

从理论上推导了聚焦探头对缺陷最佳检测能力的计算方法。

关键词：聚焦探头信噪比超声检验计算方法检测能力

脉冲回波对比法非介入测量液体声阻抗的灵敏度

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南京大学学报（自然科学版） 2017年第1期53卷 122-127页

作者：祁宏昌梁双龙莫润阳广州供电局有限公司输电管理所广州510310 陕西省超声学重点实验室陕西师范大学西安710119

基于声波在异质界面声压反射系数对界面两侧介质特性声阻抗变化的敏感性,将回波高度随待测液体阻抗变化的函数作为系统的灵敏度,通过构建新的数学方法并通过设计实验快速实现对二甲基硅油的特性声阻抗的非介入测试.实验时以钢板做反射基... 详细信息

基于声波在异质界面声压反射系数对界面两侧介质特性声阻抗变化的敏感性,将回波高度随待测液体阻抗变化的函数作为系统的灵敏度,通过构建新的数学方法并通过设计实验快速实现对二甲基硅油的特性声阻抗的非介入测试.实验时以钢板做反射基板,用钢/水界面对检测系统进行标定,分别测试超声波在钢板与水、钢板与待测液体界面的多次反射回波幅度,并通过回波幅度比对方法获得待测液体介质的特性声阻抗值.结果显示,在容器壁与其内液体介质构成的固/液界面上的第一次界面反射回波较其它高次回波具有最高的灵敏度;新方法提供了液体特性声阻抗的直接信息;器壁材料一定时,其厚度对检测结果有一定影响.

关键词：特性声阻抗脉冲回波对比非介入硅油

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花生油高频剪切黏度超声检测

中国油脂 2020年第1期45卷 121-125页

作者：胡润润李盎然莫润阳陕西师范大学陕西省超声学重点实验室西安710119

为对多次高温加热食用油品质进行评价,以反复煎炸花生油为研究对象,基于超声水平剪切波(SH波)在固体/黏弹性液体界面的复反射系数与液体黏弹性模量、黏度系数等关系模型,以固体/空气界面为参考,采用固/气、固/液界面回波对比方法,测量... 详细信息

为对多次高温加热食用油品质进行评价,以反复煎炸花生油为研究对象,基于超声水平剪切波(SH波)在固体/黏弹性液体界面的复反射系数与液体黏弹性模量、黏度系数等关系模型,以固体/空气界面为参考,采用固/气、固/液界面回波对比方法,测量了不同劣化状态花生油在室温时的剪切黏度,并与流变仪测试结果进行比较。结果表明,超声SH波与流变仪均很好地反映了样品黏度随加热次数的变化关系。研究证明超声方法在线评价油品劣化状态具有可行性。

关键词：食用油煎炸花生油 SH波黏度油品劣化