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Chinese Physics B 2021年第2期30卷 367-376页

作者： Yu Yang ming-lei shan Qing-Bang Han Xue-Fen Kan Jiangsu Key Laboratory of Power Transmission and Distribution Equipment Technology Hohai UniversityChangzhou 213022China College of Computer and Information Hohai UniversityNanjing 210000China

A multicomponent thermal multi-relaxation-time(MRT)lattice Boltzmann method(LBM)is presented to study collapsing cavitation *** simulation results satisfy Laplace law and the adiabatic law,and are consistent with the numerical solution of the Rayleigh-Plesset *** study the effects of the non-condensable gas inside bubble on collapsing cavitation bubble,a numerical model of single spherical bubble near a solid wall is *** temperature and pressure evolution of the two-component two-phase flow are well *** addition,the collapse process of the cavitation bubble is discussed elaborately by setting the volume fractions of the gas and vapor to be the only *** results show that the non-condensable gas in the bubble significantly affects the pressure field,temperature field evolution,collapse velocity,and profile of the *** distinction of the pressure and temperature on the wall after the second collapse becomes more obvious as the non-condensable gas concentration increases.

关键词： multicomponent cavitation bubble non-condensable gas lattice Boltzmann method

Frequency effect on p-nitrophenol degradation under conditions of strict acoustic and electric control

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Water Science and Engineering 2011年第1期4卷 74-82页

作者： Chang-ping ZHU Bo HUANG Qing-bang HAN Cai-hua NI Guang-jun ZHU ming-hua LIU ming-lei shan College of Computer and lnformation Engineering Hohai University Changzhou 213022 P. R. China State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Hohai University Nanjing 210098 P. R. China College of Information and Electrical Engineering China University of Mining and Technology Xuzhou 221008 P. R. China School of Chemical and Material Engineering Jiangnan University Wuxi 214122 P. R. China

The process of decomposing p-nitrophenol （PNP） with power ultrasound requires strict control of acoustic and electric conditions. In this study, the conditions, including acoustic power and acoustic intensity, but not ultrasonic frequency, were controlled strictly at constant levels. The absorbency and the COD concentrations of the samples were measured in order to show the variation of the sample concentration. The results show significant differences in the trend of the solution degradation rate as acoustic power increases after the PNP solution （with a concentration of ll4 mg/L and a pH value of 5.4） is irradiated for 60 min with ultrasonic frequencies of 530.8 kHz, 610.6 kHz, 855.0 kHz, and 1130.0 kHz. The degradation rate of the solution increases with time and acoustic power （acoustic intensity）. On the other hand, the degradation rate of the solution is distinctly dependent on frequency when the acoustic power and intensity are strictly controlled and maintained at constant levels, The degradation rate of the PNP solution declines with ultrasonic frequencies of 530.8 kHz, 610.6 kHz, 855.0 kHz, and 1 130.0 kHz; the COD concentration, on the contrary, increase.

关键词： ultrasonic treatment frequency effect COD concentration p-nitrophenol

Effect of viscosity on stability and accuracy of the two-component lattice Boltzmann method with a multiple-relaxation-time collision operator investigated by the acoustic attenuation model

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Chinese Physics B 2022年第3期31卷 364-374页

作者： Le Bai ming-lei shan Yu Yang Na-Na Su Jia-Wen Qian Qing-Bang Han Jiangsu Key Laboratory of Power Transmission and Distribution Equipment Technology Hohai University Changzhou 213022China College of Internet of Things Engineering Hohai University Changzhou 213022China

A two-component lattice Boltzmann method(LBM) with a multiple-relaxation-time(MRT) collision operator is presented to improve the numerical stability of the single relaxation time(SRT) model. The macroscopic and the momentum conservation equations can be retrieved through the Chapman–Enskog(C-E) expansion analysis. The equilibrium moment with the diffusion term is calculated, a diffusion phenomenon is simulated by utilizing the developed model, and the numerical stability is verified. Furthermore, the binary mixture channel model is designed to simulate the sound attenuation phenomenon, and the obtained simulation results are found to be consistent with the analytical solutions. The sound attenuation model is used to study the numerical stability and calculation accuracy of the LBM model. The simulation results show the stability and accuracy of the MRT model and the SRT model under different viscosity conditions. Finally,we study the influence of the error between the macroscopic equation of the MRT model and the standard incompressible Navier–Stokes equation on the calculation accuracy of the model to demonstrate the general applicability of the conclusions drawn by the sound attenuation model in the present study.

关键词： two-component lattice Boltzmann method acoustic attenuation

Fractal microstructure of Ag film via plasma discharge as SERS substrates

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Chinese Physics B 2021年第12期30卷 479-483页

作者： Xue-Fen Kan Cheng Yin Zhuang-Qi Cao Wei Su ming-lei shan Xian-Ping Wang Jiangsu Key Laboratory of Power Transmission and Distribution Equipment Technology Hohai UniversityChangzhou 213022China Department of Physics and Astronomy Shanghai JiaoTong UniversityShangha 200240China Department of Physics Key Laboratory of Optoelectronic and Telecommunication of Jiangxi ProvinceJiangxi Normal UniversityNanchang 330022China

According to the atmospheric pressure plasma(APP)technology,we propose a rapid synthetic approach of the substrates for enhanced Raman *** plasma is used to modify and etch the surface of silver film,which generates large scale hotspots'*** switching the discharge polarity and adjusting the film thickness,different surface morphologies are formed due to the oxidation,reactive etch and accumulation of the plasma product in a certain *** under positive corona discharge condition,dense snake-like microstructures are formed by the gradual connection of individual nanoparticles,which are driven by the influence of the electric field on surface *** addition,the experiments verify that the corresponding enhancement factor(EF)raises at least five orders of magnitude and the treatment time is about 10 min.

关键词： plasma discharge fractal microstructure surface-enhanced Raman scattering

Effect of porous surface layer on wave propagation in elastic cylinder immersed in fluid

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Chinese Physics B 2023年第1期32卷 340-353页

作者：苏娜娜韩庆邦单鸣雷殷澄 College of Internet of Things Engineering Hohai UniversityChangzhou 213022China

To study the damage to an elastic cylinder immersed in fluid, a model of an elastic cylinder wrapped with a porous medium immersed in fluid is designed. This structure can both identify the properties of guided waves in a more practical model and address the relationship between the cylinder damage degree and the surface and surrounding medium. The principal motivation is to perform a detailed quantitative analysis of the longitudinal mode and flexural mode in an elastic cylinder wrapped with a porous medium immersed in fluid. The frequency equations for the propagation of waves are derived each for a pervious surface and an impervious surface by employing Biot theory. The influences of the various parameters of the porous medium wrapping layer on the phase velocity and attenuation are discussed. The results show that the influences of porosity on the dispersion curves of guided waves are much more significant than those of thickness,whereas the phase velocity is independent of the static permeability. There is an apparent “mode switching” between the two low-order modes. The characteristics of attenuation are in good agreement with the results from the dispersion *** work can support future studies for optimizing the theory on detecting the damage to cylinder or pipeline.

关键词： wave propagation porous surface layer dispersion attenuation

Investigation of cavitation bubble collapse near rigid boundary by lattice Boltzmann method

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Journal of Hydrodynamics 2016年第3期28卷 442-450页

作者：单鸣雷朱昌平周曦殷澄韩庆邦 College of Internet of Things Engineering and Jiangsu Key Laboratory of Power Transmission and Distribution Equipment Technology Hohai University

The dynamics of the bubble collapse near a rigid boundary is a fundamental issue for the bubble collapse application and prevention. In this paper, the bubble collapse is modeled by adopting the lattice Boltzmann method （LBM） and is verified, and then the dynamic characteristics of the collapsing bubble with the second collapse is investigated. The widely used shan-Chen model in the LBM multiphase community is modified by coupling with the Carnahan-Starling equation of state （C-S EOS） and the exact difference method （EDM） for the forcing term treatment. The simulation results of the bubble profile evolution by the LBM are in excellent agreements with the theoretical and experimental results. From the two-dimensional pressure field evolution, the dynamic characteristics of the different parts during the bubble collapse stage are studied. The role of the second collapse in the rigid boundary damage is discussed, and the impeding effect between two collapses is demonstrated.

关键词： cavitation mechanics lattice Boltzmarm method bubble collapse rigid boundary

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大樱桃嫁接育苗技术

北方果树 2011年第1期 22-23页

作者：雷明山甘肃省天水市果树研究所甘肃天水741002

近年来，随着大樱桃产业的快速发展。优质良种苗木比较紧缺，为了扩大大樱桃苗木繁育，给生产提供优质良种苗木。我们采用繁育实生苗方式嫁接繁育大樱桃苗。由于樱桃种子拱土能力差，露地播种易板结，出苗率低。因此我们采用小拱棚播种... 详细信息

近年来，随着大樱桃产业的快速发展。优质良种苗木比较紧缺，为了扩大大樱桃苗木繁育，给生产提供优质良种苗木。我们采用繁育实生苗方式嫁接繁育大樱桃苗。由于樱桃种子拱土能力差，露地播种易板结，出苗率低。因此我们采用小拱棚播种繁育砧木苗．效果很好，而且还可以避免不正常年份晚霜或寒流的侵害。现将该技术总结如下。

关键词：嫁接育苗技术大樱桃小拱棚播种苗木繁育良种苗木嫁接繁育实生苗出苗率

P2Y1 receptor in Alzheimer’s disease

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Neural Regeneration Research 2025年第2期20卷 440-453页

作者： shan Luo Yifei Wang Tatsuhiro Hisatsune Department of Integrated Biosciences The University of TokyoKashiwaJapan

Alzheimer’s disease is the most frequent form of dementia characterized by the deposition of amyloid-beta plaques and neurofibrillary tangles consisting of hyperphosphorylated *** amyloid-beta plaques has been a primary direction for developing Alzheimer’s disease treatments in the last ***,existing drugs targeting amyloid-beta plaques have not fully yielded the expected results in the clinic,necessitating the exploration of alternative therapeutic *** evidence unravels that astrocyte morphology and function alter in the brain of Alzheimer’s disease patients,with dysregulated astrocytic purinergic receptors,particularly the P2Y1 receptor,all of which constitute the pathophysiology of Alzheimer’s *** receptors are not only crucial for maintaining normal astrocyte function but are also highly implicated in neuroinflammation in Alzheimer’s *** review delves into recent insights into the association between P2Y1 receptor and Alzheimer’s disease to underscore the potential neuroprotective role of P2Y1 receptor in Alzheimer’s disease by mitigating neuroinflammation,thus offering promising avenues for developing drugs for Alzheimer’s disease and potentially contributing to the development of more effective treatments.

关键词： astrocytes neuroinflammation P2Y1 receptor purinergic receptor

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一种新型绳索钻具打捞器

吉林地质 2014年第4期33卷 129-131页

作者：明文威苑春雷雷明善吉林省地质勘探技术研究所吉林长春130021 吉林省地质矿产勘查开发局吉林长春130061

绳索钻具打捞器在地质勘探取心过程中有着相当重要的作用,不论是取心还是深孔投放钻具都要用到打捞器,这就要求打捞器在投放过程中有极高的可靠性,保证脱卡器能够顺利脱卡。同时打捞器在被提出钻外后要求有很高的安全性,保证不会空中脱... 详细信息

绳索钻具打捞器在地质勘探取心过程中有着相当重要的作用,不论是取心还是深孔投放钻具都要用到打捞器,这就要求打捞器在投放过程中有极高的可靠性,保证脱卡器能够顺利脱卡。同时打捞器在被提出钻外后要求有很高的安全性,保证不会空中脱钩伤人。本文所述的一种新型绳索打捞器具有较高的可靠性和安全性,并且兼具重锤的功能,无需打钻过程中投放重锤,可以大大提高钻探效率。

关键词：绳索钻具打捞器冲击作用

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地质勘探常用液压钻机动力设备的特性与选择

吉林地质 2015年第2期34卷 120-122页

作者：闫鹏飞雷明善吉林省地质技术装备研究所吉林长春市130103 吉林省地质矿产勘查开发局吉林长春130061

通过对液压钻机动力设备特性的了解,并结合液压钻机工作环境.对液压钻机动力设备进行合理选择。以达到优化钻机结构、增强钻机环境适应能力、减少钻机动力故障、提高钻探效率的目的。

关键词：钻机动力设备特性选择