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Experimental and theoretical study of coupled influence of flow velocity increment and particle size on particle retention and release in porous media

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Water Science and Engineering 2017年第3期10卷 236-245页

作者： Xing-xin Chen qi-peng cai Zhong-han Wu School of Transportation Southeast University School of Civil Engineering Huaqiao University School of Civil Engineering Beijing Jiaotong University

Experimental and theoretical studies were carried out to investigate the coupled influence of flow velocity increment and particle size on the retention and release of particles in porous media. Particle release was examined through measurement of changes in effluent particle concentrations, and particle retention was assessed through measurement of the final spatial distribution of particles remaining in the soil columns after the experiments. Particle release curves were simulated using a convection-dispersion model that includes the instantaneous release of the line source. Fitted model parameters were used to gain insights into the mechanisms that control particle retention and release. When the flow velocity increment was 0.0435 cm/s, the peak concentration of particles decreased with increasing flow velocity until the latter approached a critical level, beyond which the particle concentration increased. Particle wedging and fouling were considered the primary mechanisms that controlled particle retention and release beyond the critical particle velocity. In experiments with large flow velocity increments, small particles exhibited lower particle mass fraction than large particles as particle wedging and fouling increased with particle size. The range of longitudinal dispersivity decreased with an increasing particle size and flow velocity increment. Moreover, the mean particle velocity increased with the mean interstitial fluid velocity. The mean particle velocity profile was highly sensitive to the particle size at low velocity increments. In general,particle release rates increased with both flow velocity and velocity increment. The mass of the released particles provides further evidence that particle wedging and fouling are the major factors that control particle release in sand columns.

关键词： Particle Porous media Retention Release Hydrodynamic force

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Spin-orbit coupling adjusting topological superfluid of mass-imbalanced Fermi gas

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Chinese Physics B 2022年第9期31卷 208-216页

作者： Jian Feng Wei-Wei Zhang Liang-Wei Lin qi-peng cai Yi-cai Zhang Sheng-Can Ma Chao-Fei Liu School of Science Jiangxi University of Science and TechnologyGanzhou 341000China School of Physics and Electronic Engineering Guangzhou UniversityGuangzhou 510006China

Topological superfluid state is different from the normal superfluid one due to the excitation energy gap on the *** to obtain the topological superfluid state by using spin-orbit coupling to control the s-waves paired mass-imbalanced Fermi gas is a recent novel *** this paper,we study the topological superfluid phase diagram of two-dimensional mass-imbalanced Fermi gas with Rashba spin-orbit coupling at zero *** find that due to the competition among mass imbalance,pairing interaction and spin-orbit coupling,there is a double-well structure in the thermodynamic potential,which affects the properties of the ground state of the *** comprehensively give the phase diagrams of the system on the plane of spin-orbit coupling and chemical potential,and the phase diagrams on the plane of the reduced mass ratio and two-body binding *** study not only points out the stable region of topolog-ical superfluid state of mass-imbalanced Fermi gas,but also provides a detailed theoretical basis for better observation of topological superfluid state in experiments.

关键词： topological superfluid mass-imbalanced spin-orbit coupling Fermi gas

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Correlation between the rock mass properties and maximum horizontal stress:A case study of overcoring stress measurements

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International Journal of Minerals,Metallurgy and Materials 2025年第1期32卷 39-48页

作者： peng Li Meifeng cai Shengjun Miao Yuan Li Yu Wang Key Laboratory of Ministry of Education for Efficient Mining and Safety of Metal Mines University of Science and Technology BeijingBeijing 100083China State Key Laboratory of Coal Resources and Safe Mining China University of Mining and TechnologyXuzhou 221116China

Understanding the mechanical properties of the lithologies is crucial to accurately determine the horizontal stress *** investigate the correlation between the rock mass properties and maximum horizontal stress,the three-dimensional(3D)stress tensors at 89 measuring points determined using an improved overcoring technique in nine mines in China were adopted,a newly defined characteristic parameter C_(ERP)was proposed as an indicator for evaluating the structural properties of rock masses,and a fuzzy relation matrix was established using the information distribution *** results indicate that both the vertical stress and horizontal stress exhibit a good linear growth relationship with *** is no remarkable correlation between the elastic modulus,Poisson's ratio and depth,and the distribution of data points is scattered and ***,there is no obvious relationship between the rock quality designation(RQD)and *** maximum horizontal stress σ_(H) is a function of rock properties,showing a certain linear relationship with the C_(ERP)at the same *** addition,the overall change trend of σ_(H) determined by the established fuzzy identification method is to increase with the increase of C_(ERP).The fuzzy identification method also demonstrates a relatively detailed local relationship betweenσ_H and C_(ERP),and the predicted curve rises in a fluctuating way,which is in accord well with the measured stress data.

关键词： overcoring stress measurements elastic modulus Poisson's ratio rock quality designation maximum horizontal stress fuzzy identification

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A Multi-Objective Particle Swarm Optimization Algorithm Based on Decomposition and Multi-Selection Strategy

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Computers, Materials & Continua 2025年第1期82卷 997-1026页

作者： Li Ma cai Dai Xingsi Xue Cheng peng School of Computer Science Shaanxi Normal UniversityXi’an710119China Fujian Provincial Key Laboratory of Big Data Mining and Applications Fujian University of TechnologyFuzhou350118China Information Construction and Management Center and Institute of Artificial Intelligence and Educational New Productivity Ningxia Normal UniversityGuyuan756099China

The multi-objective particle swarm optimization algorithm(MOPSO)is widely used to solve multi-objective optimization *** the article,amulti-objective particle swarm optimization algorithmbased on decomposition and multi-selection strategy is proposed to improve the search ***,two update strategies based on decomposition are used to update the evolving population and external archive,***,a multiselection strategy is *** first strategy is for the subspace without a non-dominated *** the neighbor particles,the particle with the smallest penalty-based boundary intersection value is selected as the global optimal solution and the particle far away fromthe search particle and the global optimal solution is selected as the personal optimal solution to enhance global *** second strategy is for the subspace with a non-dominated *** the neighbor particles,two particles are randomly selected,one as the global optimal solution and the other as the personal optimal solution,to enhance local *** third strategy is for Pareto optimal front(PF)discontinuity,which is identified by the cumulative number of iterations of the subspace without non-dominated *** the subsequent iteration,a new probability distribution is used to select from the remaining subspaces to ***,an adaptive inertia weight update strategy based on the dominated degree is designed to further improve the search ***,the proposed algorithmis compared with fivemulti-objective particle swarm optimization algorithms and five multi-objective evolutionary algorithms on 22 test *** results show that the proposed algorithm has better performance.

关键词： Multi-objective optimization multi-objective particle swarm optimization decomposition multi-selection strategy

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Establishment of human cerebral organoid systems to model early neural development and assess the central neurotoxicity of environmental toxins

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Neural Regeneration Research 2025年第1期20卷 242-252页

作者： Daiyu Hu Yuanqing Cao Chenglin cai Guangming Wang Min Zhou Luying peng Yantao Fan qiong Lai Zhengliang Gao Fundamental Research Center Shanghai Yangzhi Rehabilitation Hospital(Shanghai Sunshine Rehabilitation Center)School of MedicineTongji UniversityShanghaiChina Institute of Geriatrics(Shanghai University) Affiliated Nantong Hospital of Shanghai University(The Sixth People’s Hospital of Nantong)Shanghai University School of MedicineNantongJiangsu ProvinceChina Shanghai Engineering Research Center of Organ Repair Shanghai University School of MedicineShanghaiChina Key Laboratory of Arrhythmias Ministry of EducationShanghai East HospitalSchool of MedicineTongji UniversityShanghaiChina

Human brain development is a complex process,and animal models often have significant *** address this,researchers have developed pluripotent stem cell-derived three-dimensional structures,known as brain-like organoids,to more accurately model early human brain development and *** enable more consistent and intuitive reproduction of early brain development,in this study,we incorporated forebrain organoid culture technology into the traditional unguided method of brain organoid *** involved embedding organoids in matrigel for only 7 days during the rapid expansion phase of the neural epithelium and then removing them from the matrigel for further cultivation,resulting in a new type of human brain organoid *** cerebral organoid system replicated the temporospatial characteristics of early human brain development,including neuroepithelium derivation,neural progenitor cell production and maintenance,neuron differentiation and migration,and cortical layer patterning and formation,providing more consistent and reproducible organoids for developmental modeling and toxicology *** a proof of concept,we applied the heavy metal cadmium to this newly improved organoid system to test whether it could be used to evaluate the neurotoxicity of environmental *** organoids exposed to cadmium for 7 or 14 days manifested severe damage and abnormalities in their neurodevelopmental patterns,including bursts of cortical cell death and premature *** exposure caused progressive depletion of neural progenitor cells and loss of organoid integrity,accompanied by compensatory cell proliferation at ectopic *** convenience,flexibility,and controllability of this newly developed organoid platform make it a powerful and affordable alternative to animal models for use in neurodevelopmental,neurological,and neurotoxicological studies.

关键词： cadmium cell death cell proliferation cortical development environmental toxins neural progenitor cells neurogenesis neurotoxicology organoids stem cells

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产妇血清HBV DNA含量对乳汁和新生儿血清HBV DNA浓度的影响

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中山大学学报（医学科学版） 2010年第5期31卷 729-730,F0003页

作者：彭其才许成芳滕奔琦侯红瑛中山大学附属第三医院产科广东广州510630

【目的】探讨乙型肝炎病毒携带产妇血清HBV DNA含量对乳汁和新生儿血清中HBV DNA含量的影响,以指导孕期处理和母乳喂养。【方法】选择乙型肝炎病毒携带产妇145例,采用荧光定量聚合酶链反应(FQ-PCR)技术对产妇血清、母乳和新生儿血清HBV ... 详细信息

【目的】探讨乙型肝炎病毒携带产妇血清HBV DNA含量对乳汁和新生儿血清中HBV DNA含量的影响,以指导孕期处理和母乳喂养。【方法】选择乙型肝炎病毒携带产妇145例,采用荧光定量聚合酶链反应(FQ-PCR)技术对产妇血清、母乳和新生儿血清HBV DNA进行检测,并将产妇血清HBV DNA浓度分3级,分析产妇血清不同HBV DNA浓度级对乳汁及新生儿血清HBV DNA浓度的影响。【结果】血清HBV DNA<500copies/mL的产妇74例,乳汁中检出HBV DNA阳性为零,新生儿血清HBV DNA阳性1例;血清HBV DNA浓度为500～1.0×106copies/mL产妇30例,乳汁中检出HBV DNA阳性为3例,新生儿血清HBV DNA阳性1例;血清HBV DNA浓度为≥1.0×106copies/mL产妇41例,乳汁中检出HBV DNA阳性为36例,阳性率为87.8%,新生儿血清HBV DNA阳性仅3例。【结论】产妇血清中HBV DNA≥1.0×106copies/mL时,乳汁中HBV DNA阳性率大幅度增加,而当产妇血清HBV DNA浓度小于1.0×106copies/mL,乳汁中HBV DNA检出率极低。产妇血清HBV DNA浓度对宫内感染影响不大。

关键词： HBV DNA 母婴传播母乳喂养荧光定量聚合酶链反应

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Porous Organic Cage‑Based Quasi‑Solid‑State Electrolyte with Cavity‑Induced Anion‑Trapping Effect for Long‑Life Lithium Metal Batteries

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Nano-Micro Letters 2025年第2期17卷 376-386页

作者： Wei-Min qin Zhongliang Li Wen‑Xia Su Jia‑Min Hu Hanqin Zou Zhixuan Wu Zhiqin Ruan Yue‑peng cai Kang Li qifeng Zheng School of Chemistry South China Normal UniversityGuangzhou 510006People’s Republic of China Key Laboratory of Functional Metal‑Organic Compounds of Hunan Province College of Chemistry and Material ScienceHengyang Normal UniversityHengyang 421008People’s Republic of China Guangzhou Key Laboratory of Energy Conversion and Energy Storage Materials Guangzhou 510006People’s Republic of China

Porous organic cages(POCs)with permanent porosity and excellent host–guest property hold great potentials in regulating ion transport behavior,yet their feasibility as solid-state electrolytes has never been testified in a practical ***,we design and fabricate a quasi-solid-state electrolyte(QSSE)based on a POC to enable the stable operation of Li-metal batteries(LMBs).Benefiting from the ordered channels and cavity-induced anion-trapping effect of POC,the resulting POC-based QSSE exhibits a high Li+transference number of 0.67 and a high ionic conductivity of 1.25×10^(−4) S cm^(−1) with a low activation energy of 0.17 *** allow for homogeneous Li deposition and highly reversible Li plating/stripping for over 2000 *** a proof of concept,the LMB assembled with POC-based QSSE demonstrates extremely stable cycling performance with 85%capacity retention after 1000 ***,our work demonstrates the practical applicability of POC as SSEs for LMBs and could be extended to other energy-storage systems,such as Na and K batteries.

关键词： Porous organic cage Cavity-induced anion-trapping Quasi-solid-state electrolyte Homogeneous Li+flux Lithium metal battery

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Maintaining moderate levels of hypochlorous acid promotes neural stem cell proliferation and differentiation in the recovery phase of stroke

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Neural Regeneration Research 2025年第3期20卷 845-857页

作者： Lin-Yan Huang Yi-De Zhang Jie Chen Hai-Di Fan Wan Wang Bin Wang Ju-Yun Ma peng-peng Li Hai-Wei Pu Xin-Yian Guo Jian-Gang Shen Su-Hua qi School of Medical Technology Xuzhou Key Laboratory of Laboratory DiagnosticsXuzhou Medical UniversityXuzhouJiangsu ProvinceChina School of Pharmacy Xuzhou Medical UniversityXuzhouJiangsu ProvinceChina Department of Laboratory Medicine Branch Hospital of Huai’an First People’s HospitalHuai’anJiangsu ProvinceChina Department of Laboratory Medicine the Affiliated Hospital of Xuzhou Medical UniversityXuzhouJiangsu ProvinceChina School of Chinese Medicine The University of Hong KongHong Kong Special Administrative RegionChina

It has been shown clinically that continuous removal of ischemia/reperfusion-induced reactive oxygen species is not conducive to the recovery of late ***,previous studies have shown that excessive increases in hypochlorous acid after stroke can cause severe damage to brain *** previous studies have found that a small amount of hypochlorous acid still exists in the later stage of stroke,but its specific role and mechanism are currently *** simulate stroke in vivo,a middle cerebral artery occlusion rat model was established,with an oxygen-glucose deprivation/reoxygenation model established in vitro to mimic *** found that in the early stage(within 24 hours)of ischemic stroke,neutrophils produced a large amount of hypochlorous acid,while in the recovery phase(10 days after stroke),microglia were activated and produced a small amount of hypochlorous ***,in acute stroke in rats,hypochlorous acid production was prevented using a hypochlorous acid scavenger,taurine,or myeloperoxidase inhibitor,4-aminobenzoic acid *** results showed that high levels of hypochlorous acid(200μM)induced neuronal apoptosis after oxygen/glucose deprivation/***,in the recovery phase of the middle cerebral artery occlusion model,a moderate level of hypochlorous acid promoted the proliferation and differentiation of neural stem cells into neurons and *** suggests that hypochlorous acid plays different roles at different phases of cerebral ischemia/reperfusion *** levels of hypochlorous acid(5 and 100μM)promoted nuclear translocation ofβ-*** transfection of single-site mutation plasmids,we found that hypochlorous acid induced chlorination of theβ-catenin tyrosine 30 residue,which promoted nuclear ***,our study indicates that maintaining low levels of hypochlorous acid plays a key role in the recovery of neurological function.

关键词： cell differentiation cerebral ischemia/reperfusion injury chlorination hypochlorous acid microglia neural stem cell neurogenesis nuclear translocation stroke β-catenin

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中频磁控反应溅射制备硅基氮化铝薄膜

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西华大学学报（自然科学版） 2008年第1期27卷 30-31,72页

作者：陈璞彭启才西华大学材料科学与工程学院四川成都610039

利用中频磁控反应溅射技术,以高纯Al为靶材、高纯N2为反应气体,在Si(111)衬底上成功制备出氮化铝薄膜。通过X衍射分析和原子力显微镜测试发现:提高N2分压和升高衬底温度有利于AlN(110)的形成;随着衬底温度的改变,AlN薄膜的表面粗糙度也... 详细信息

利用中频磁控反应溅射技术,以高纯Al为靶材、高纯N2为反应气体,在Si(111)衬底上成功制备出氮化铝薄膜。通过X衍射分析和原子力显微镜测试发现:提高N2分压和升高衬底温度有利于AlN(110)的形成;随着衬底温度的改变,AlN薄膜的表面粗糙度也在变化,当衬底温度为230℃时,RMS表面粗糙度最小。实验结果表明:升高衬底温度有利于制备(110)面择优取向的AlN薄膜,退火是影响氮化铝薄膜表面粗糙度的重要因素。

关键词：氮化铝中频磁控反应溅射结构粗糙度

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56例活跃期停滞剖宫产原因分析

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中国实用医药 2010年第30期5卷 33-34页

作者：彭其才李萍张媛中山大学附属第三医院产科 510630

目的探讨活跃期停滞剖宫产原因,总结经验,更好地指导产程处理。方法回顾分析2009年1月至2009年12月我院产科因活跃期停滞剖宫产患者56例临床资料。结果持续性枕后位或枕横位占83.9%,忽略性巨大胎儿和胎儿窘迫发生率均16.1%,无一例新生... 详细信息

目的探讨活跃期停滞剖宫产原因,总结经验,更好地指导产程处理。方法回顾分析2009年1月至2009年12月我院产科因活跃期停滞剖宫产患者56例临床资料。结果持续性枕后位或枕横位占83.9%,忽略性巨大胎儿和胎儿窘迫发生率均16.1%,无一例新生儿窒息。结论持续性枕后位或枕横位是活跃期停滞剖宫产的主要原因,忽略性巨大胎儿发生率高也应引起产科医生足够重视。

关键词：活跃期停滞剖宫产产程

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