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Experimental and theoretical analysis of loading characteristics of electret fi lter media for charged particles

PARTICUOLOGY 2024年第10期93卷 87-98页

作者： cai, Yiqi cai, Rongrong Zhang, Lizhi South China Univ Technol Sch Chem & Chem Engn Key Lab Enhanced Heat Transfer & Energy Conservat Educ Minist Guangzhou 510640 Peoples R China South China Univ Technol State Key Lab Subtrop Bldg Sci Guangzhou 510640 Peoples R China

The degradation of filtration performance in electret filter media during usage poses a significant challenge. Pre-charging of aerosols has been identified as an effective method to mitigate this issue. However, the effects of particle charging characteristics on the loading characteristics of electret filters still need a comprehensive understanding. In this study, a needle-cylinder corona charger was employed to pre-charge aerosols, and the particle charge state was determined by multiphysics simulation. The effects of particle charge polarity and charge quantity on the loading performance of the electret filter were quantitatively investigated. The results showed that the particle charge polarity had a negligible impact on the loading performance under the condition of the equivalent particle charge quantity. In addition, the charged particles effectively improved the efficiency degradation during the loading process of electret media, with higher charge quantities resulting in more pronounced improvements. The electrostatic attenuation factor showed a negative exponential correlation with the particle charge quantity. This was attributed to the uneven particle deposition on fiber surface due to the attraction of charged particles by the opposite charges on the electret fibers, which alleviated the effect of electrostatic shielding. (c) 2024 Published by Elsevier B.V. on behalf of Chinese Society of Particuology and Institute of Process Engineering, Chinese Academy of Sciences.

关键词： Electret filter Charged particles Loading characteristic Corona charging Electrostatic screening NUMERICAL-SIMULATION FILTER FILTRATION AEROSOL PERFORMANCE COLLECTION TRANSPORT MODEL

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地方本科院校办学面临的困惑与对策--以温州大学为研究对象

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高等工程教育研究 2010年第1期58卷 96-101页

作者：蔡袁强戴海东翁之秋温州大学温州大学教务处温州大学党委办公室

目前我国有66.07%的地级行政区域设立了地方本科院校,其办学水平如何直接关系到我国高等教育质量。但我国地方本科院校普遍存在诸如人才培养目标定位模糊、缺乏办学特色与标志性教学成果、与地方产业和社会经济发展未能紧密结合等问题... 详细信息

目前我国有66.07%的地级行政区域设立了地方本科院校,其办学水平如何直接关系到我国高等教育质量。但我国地方本科院校普遍存在诸如人才培养目标定位模糊、缺乏办学特色与标志性教学成果、与地方产业和社会经济发展未能紧密结合等问题。面对困惑,地方本科院校必须树立全新的办学理念,多元化定位应用型人才培养目标,融入并服务于地方产业的转型升级,探索独特的办学机制,同时要凝炼特色,提高办学的影响力和显示度。

关键词：地方本科院校办学定位困惑思考

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土动力学与岩土地震工程

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土木工程学报 2016年第5期49卷 9-30页

作者：蔡袁强于玉贞袁晓铭王军郭林温州大学浙江温州325035 清华大学水沙科学与水利水电工程国家重点实验室北京100084 中国地震局工程力学研究所黑龙江哈尔滨150080

近年来,动力荷载引起的工程建设中的新问题给土动力学的研究不断注入新的活力,提出新的挑战,从而推动其发展和完善。文章简要回顾了土工动力测试技术、土体的动力特性与本构关系、土体液化、土石坝地震响应数值模拟、交通荷载引起的环... 详细信息

近年来,动力荷载引起的工程建设中的新问题给土动力学的研究不断注入新的活力,提出新的挑战,从而推动其发展和完善。文章简要回顾了土工动力测试技术、土体的动力特性与本构关系、土体液化、土石坝地震响应数值模拟、交通荷载引起的环境振动及长期沉降等方面的研究进展,并对一些需加强和深入的研究方向进行阐述。

关键词：动荷载动力特性动本构关系土体液化地震响应交通荷载

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Shor's algorithm does not factor large integers in the presence of noise

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Science China(Information Sciences) 2024年第7期67卷 305-320页

作者： Jin-Yi cai College of Letters and Science University of Wisconsin

We consider Shor's quantum factoring algorithm in the setting of noisy quantum gates. Under a generic model of random noise for(controlled) rotation gates, we prove that the algorithm does not factor integers of the form pq when the noise exceeds a vanishingly small level in terms of n—the number of bits of the integer to be factored, where p and q are from a well-defined set of primes of positive density. We further prove that with probability 1-o(1) over random prime pairs(p, q), Shor's factoring algorithm does not factor numbers of the form pq, with the same level of random noise present.

关键词： random noise Shor's algorithm rotation gates quantum computing prime factorization

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Whittle’s Index Based Sensor Scheduling for Multiprocess Systems Under DoS Attacks

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Journal of Systems Science & Complexity 2024年第1期37卷 329-350页

作者： cai Zai DING Kemi Shenzhen Key Laboratory of Control Theory and Intelligent Systems Southern University of Science and TechnologyShenzhen 518055China.

In this paper,the authors consider how to design defensive countermeasures against DoS attacks for remote state estimation of multiprocess *** each system,a sensor will measure its state and transmits the data packets through an unreliable channel which is vulnerable to be jammed by an *** limited communication bandwidth,only a subset of sensors are allowed for data transmission,and how to select the optimal one to maximize the accuracy of remote state estimation is the focus of the proposed *** authors first formulate this problem as a Markov decision process and investigate the existence of optimal ***,the authors demonstrate the piecewise monotonicity structure of optimal *** the difficulty of obtaining an optimal policy of large-scale problems,the authors develop a suboptimal heuristic policy based on the aforementioned policy structure and Whittle’s ***,a closed form of the indices is derived in order to reduce implementation complexity of proposed scheduling policy and numerical examples are provided to illustrate the proposed developed results.

关键词： DoS attacks Kalman filter remote state estimation Whittle’s index.

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线性堆载下软黏土一维电渗固结理论与试验分析

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岩石力学与工程学报 2014年第1期33卷 179-188页

作者：王军符洪涛蔡袁强曾芳金申矫健温州大学建筑与土木工程学院浙江温州325035 江西理工大学建筑与测绘学院江西赣州341000

考虑线性堆载下水流和电流的相互作用以及孔隙水压力的消散情况,通过将单向渗流固结过程的普遍方程推广到电渗领域,建立线性堆载下软黏土一维电渗固结方程,并给出阴极排水、阳极不排水和阴阳极都排水2种情况下孔隙水压力和平均固结度的... 详细信息

考虑线性堆载下水流和电流的相互作用以及孔隙水压力的消散情况,通过将单向渗流固结过程的普遍方程推广到电渗领域,建立线性堆载下软黏土一维电渗固结方程,并给出阴极排水、阳极不排水和阴阳极都排水2种情况下孔隙水压力和平均固结度的解析解。通过参数和试验分析,研究最大堆载和加载速率对孔隙水压力消散的影响,以及电压对理论固结度和试验固结度的影响,绘制不同最大堆载和加载速率时,单面排水和双面排水下孔隙水压力消散曲线、不同电压下理论固结度和试验固结度变化曲线。结果表明:最大堆载和加载速率越大,孔隙水压力消散得越快,同时最大堆载和加载速率对双面排水的影响要比对单面排水的更大;电源电压越大,理论固结度和试验固结度的增长速度都越快,在相同时间段内试验固结度的变化幅度小于理论固结度的变化幅度。

关键词：土力学线性堆载电渗解析解孔隙水压力消散理论固结度试验固结度

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Polarized imaging dynamic light scattering for simultaneous measurement of nanoparticle size and morphology

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Particuology 2024年第2期85卷 213-223页

作者： Bingyao Wang Tianyi cai Xiaoshu cai Wu Zhou Zeqi Liu Schoolof Energy and Power Engineering University of Shanghai for Science and TechnologyShanghai200093China Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering Shanghai200093China Jiaxing MeaParTech Instrument Technology Co. LtdZhejiang314000China

The performance of nanoparticles is often affected by particle size and ***,electron microscopy or atomic force microscopy is typically utilized to determine the size and morphology of ***,there are issues such as difficult sample preparation,long processing times,and challenges in quantitative ***,it is of great significance to develop a fast,accu-rate,and statistical method to measure the size and morphology of *** this study,a new method,called polarized imaging dynamic light scattering(PIDLS),is *** nanoparticles are irradiated with a vertical linearly polarized laser beam,and a polarization camera collected the dynamic light scattering images of particles at four different polarization directions(0°,45°,90°,and 135°)at a scattering angle of 90°.The average particle size and distribution are obtained using the imaging dy-namic light scattering method at 0°polarization direction,and the morphology of the particles is ob-tained based on the depolarization patterns of the scattered *** optical sphericityΦis defined based on the degree of linear polarization(DoLP).It is also implemented for the quantitative evaluation of the sphericity of the nanoparticles,including spherical,octahedral,nanoplate,nanorod,and linear *** with the Poincarésphere parameterψ,the morphology of the nanoparticles can be roughly *** addition,PIDLS enables the measurement of particle size and morphology distributions simultaneously for evaluating the uniformity of *** effectiveness of PIDLS is verified by the measurement of five kinds of industrial titanium dioxide as well.

关键词： Imaging dynamic light scattering Polarized light scattering Non-spherical nanoparticles Morphology Online measurement

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Mathematical framework of nonlinear elastic waves propagating in pre-stressed media

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Applied Mathematics and Mechanics(English Edition) 2024年第10期45卷 1705-1716页

作者： Jiangcheng cai Mingxi DENG College of Aerospace Engineering Chongqing University

Acoustic nonlinearity holds potential as a method for assessing material stress. Analogous to the acoustoelastic effect, where the velocity of elastic waves is influenced by third-order elastic constants, the propagation of nonlinear acoustic waves in pre-stressed materials would be influenced by higher-order elastic constants. Despite this,there has been a notable absence of research exploring this phenomenon. Consequently,this paper aims to establish a theoretical framework for governing the propagation of nonlinear acoustic waves in pre-stressed materials. It delves into the impact of pre-stress on higher-order material parameters, and specifically examines the propagation of onedimensional acoustic waves within the contexts of the uniaxial stress and the biaxial stress. This paper establishes a theoretical foundation for exploring the application of nonlinear ultrasonic techniques to measure pre-stress in materials.

关键词： 74J30 acoustoelastic effect higherorder elastic constant nonlinear elastic wave O343 pre-stress medium

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考虑渗流效应的冲流带泥沙起动机理研究

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水科学进展 2019年第4期30卷 568-580页

作者：曹志刚王逸伦国振蔡袁强刘海江浙江大学滨海和城市岩土工程研究中心浙江杭州310058 浙江大学软弱土与环境土工教育部重点实验室浙江杭州310058

为揭示内部渗流对海岸冲流带泥沙起动的影响,系统地开展了斜坡海床冲流特性与泥沙起动机理研究。通过室内水槽开展了孤立波在可渗透和不可渗透斜坡海床上的冲流试验,测试了冲流过程中波高、波速等变化规律;建立了渗透海床冲流数值模型... 详细信息

为揭示内部渗流对海岸冲流带泥沙起动的影响,系统地开展了斜坡海床冲流特性与泥沙起动机理研究。通过室内水槽开展了孤立波在可渗透和不可渗透斜坡海床上的冲流试验,测试了冲流过程中波高、波速等变化规律;建立了渗透海床冲流数值模型并通过试验结果进行验证;深入分析了床面渗流对其波浪流场动态特征以及床面泥沙起动的影响机理。研究表明,床面渗流作用加剧波浪的不对称性,在波浪上冲过程中因床面强入渗作用而增大了床面切应力;回流过程因入渗所造成流量损失而导致床面切应力减小。床面渗流引起床面颗粒有效重度和切应力变化而导致泥沙希尔兹数大大增加,加剧了泥沙起动现象,且床面切应力改变是引起泥沙希尔兹数变化的主要因素。

关键词：冲流带渗流作用泥沙起动水槽试验

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An ultra-porous g-C_(3)N_(4) micro-tube coupled with MXene(Ti_(3)C_(2)TX)nanosheets for efficient degradation of organics under natural sunlight

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Journal of Environmental Sciences 2024年第3期137卷 258-270页

作者： Zongyang Ya Qiyou Wang Jingjin cai Peng Wang Xinyu Jiang Zhiyin cai Shanglin Xiang Tingwei Wang Dongyu cai College of Materials Science&Engineering Nanjing Tech University30 South PuZhu RoadNanjing 211816China Key Laboratory of Flexible Electronics(KLOFE)&Institute of Advanced Materials(IAM) Jiangsu National Synergetic Innovation Center for Advanced Materials(SICAM)Nanjing Tech University30 South PuZhu RoadNanjing 211816China

It remains as a challenge for realizing efficient photo-responsive catalysts towards largescale degradation of organic pollutants under natural *** work reports a new pore engineering strategy for creating ultra-porous g-C_(3)N_(4) micro-tubes with an unprecedentedly high specific surface area of 152.96 m^(2)/*** is mainly associated with releasing internal vapor pressure in the autoclave where the hydrothermal treatment of the urea/melamine mixture is *** by microscopic observation,porosity measurement and spectroscopic characterization,it is found that releasing the pressure at halfway of hydrothermal process is vital for forming exfoliated rod-like precursors and the de-aggregation of these rods presents substantial benefits on the production of mesopores on g-C_(3)N_(4) microtubes during the calcination of *** offers a large number of reactive sites required by photocatalytic *** these micro-tubes with Ti_(3)C_(2)T_(X) nanosheets via electrostatic interaction yields a 1D/2D heterojunction with a close interfacial *** addition of metallically conductive Ti_(3)C_(2)T_(X) nanosheets accelerates the separation between electrons and holes,and also enhances the light *** these merits of structural design lead to forming a group of highly efficient catalysts demonstrating an excellent photocatalytic degradation rate of k=0.0560 min^(-1)for RhB dyes under 100 mW/cm~2 visible light radiation that micks sunlight *** laboratory valuation is further supported by an outdoor test that shows a fast degradation rate of 0.0744 min^(-1)under natural sunlight.

关键词： Carbon nitride MXene Heterojunction Photocatalysis

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