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New insights into membrane fouling in coagulation-ultrafiltration by cake characteristics analysis:A case study with PACl-Al_(13)and PACl

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Journal of Environmental Sciences 2024年第12期146卷 217-225页

作者： Mingyao Xu Wei Ju Zhenbei Wang Jun Nan Fei Qi Chen Li yatao liu Wei Li Dezhi Sun Beijing Key Lab for Source Control Technology of Water Pollution College of Environmental Science and EngineeringBeijing Forestry UniversityBeijing 100083China Beijing Forestry University Science Co. Ltd.Beijing 100085China Skate Key Laboratory of Urban Water Resource and Environment School of EnvironmentHarbin Institute of TechnologyHarbin 150090China Research Center for Eco-environmental Engineering Dongguan University of TechnologyDongguan 523106China

Membrane fouling is a bottleneck issue that hindered the further application of ultrafiltration *** alleviate membrane fouling,coagulation-ultrafiltration(C-UF)process using polyaluminum chloride(PACl)and PACl-Al_(13)with high proportion of Al_(13)O_(4)(OH)_(24)^(7+)as coagulants,respectively,were investigated at various pH *** indicated that an increase in solution pH contributed to larger floc size and looser floc structure for both PACl and PACl-Al_(13).It was conducive to the formation of more porous cake,as evidenced by mean pore area and pore area distribution of cake,leading to lower reversible ***,humic acid(HA)removal presented a trend of first increasing and then decreasing with the increase of *** optimal HA removal was achieved at pH 6 regardless of coagulant type,suggesting that the slightest irreversible fouling should be occurred at this ***,the irreversible fouling with PACl coagulant achieved a minimum value at pH 9,while the minimal irreversible fouling with PACl-Al_(13)was observed at pH *** speculated that the cake formed by PACl could further intercept HA prior to UF process at alkaline ***,compared with PACl,PACl-Al_(13)had a stronger charge neutralization ability,thus contributing to more compact floc structure and higher HA removal at various pH *** UF fractionation measurement,higher HA removal for PACl-Al_(13)was due to higher removal of HA with molecular weight less than 50 kDa.

关键词： Coagultion-ultrafiltration Floc properties Cake characteristics Molecular weight of HA Membrane fouling

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Size-refinement enhanced flexibility and electrochemical performance of MXene electrodes for flexible waterproof supercapacitors

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Journal of Energy Chemistry 2021年第12期30卷 594-603,I0014页

作者： Jinkun Sun Yingjian liu Jiayi Huang Jiatian Li Mengmeng Chen Xiaoyu Hu yatao liu Run Wang Yanan Shen Jingjing Li Xuecheng Chen Dong Qian Baigang An Zunfeng liu Key Laboratory of Functional Polymer Materials College of Chemistry and College of PharmacyState Key Laboratory of Medicinal Chemical BiologyFrontiers Science Center for New Organic MatterNankai UniversityTianjin 300071China School of Chemical Engineering University of Science and Technology LiaoningAnshan 114051LiaoningChina Department of Mechanical Engineering The University of Texas at DallasRichardsonTX 75080United States Nanomaterials Physicochemistry Department Faculty of Chemical Technology and EngineeringWest Pomeranian University of TechnologySzczecinPiastów Ave.4271-065 SzczecinPoland

Increasing mechanical flexibility without sacrificing electrochemical performance of the electrode material is highly desired in the design of flexible electrochemical energy storage *** metal-related materials science,decreasing the grain size introduces more grain boundaries;this stops dislocations and crack propagation under deformation,and results in increased strength and ***,such a size refinement effect has not been considered in the mechanical properties,particle stacking,wetting,and electrochemical performances of flexible supercapacitor *** this paper,MXene was used as an electrode material to study the size refinement effect of flexible *** refinement improved the strength and toughness of the MXene electrodes,and this resulted in increased *** elemental analysis provided a theoretical understanding of size refinement-increased ***,the size refinement also improved the specific surface area,electric conductance,ion transportation,and water wetting properties of the electrode,and the size refinement provided highly increased energy density and power density of the MXene supercapacitors.A highly flexible,water-proof supercapacitor was fabricated using size-refined *** current study provides a new viewpoint for designing tough and flexible energy storage *** size refinement effect may also be applicable for metal ion batteries and electronic and photo devices composed of MXene and other nanoparticles.

关键词： Grain refinement Flexible supercapacitor Size grading MXene

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Cobalt single-atom catalyst tailored ceramic membrane for selective removal of emerging organic contaminants

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Environmental Science and Ecotechnology 2024年第5期21卷 219-229页

作者： Jiaxuan Yang Jing Zhao Hesong Wang yatao liu Junwen Ding Tianyi Wang Jinlong Wang Han Zhang Langming Bai Heng Liang State Key Laboratory of Urban Water Resource and Environment School of EnvironmentHarbin Institute of TechnologyHarbin150090PR China Beijing Key Laboratory for Source Control Technology of Water Pollution College of Environmental Science and EngineeringBeijing Forestry UniversityBeijing100083PR China

Water reuse is an effective way to solve the issues of current wastewater increments and water resource ***,a promising method for water reuse,has the characteristics of low energy consumption,easy operation,and high adaptability to coupling with other water treatment ***,emerging organic contaminants(EOCs)in municipal wastewater cannot be effectively intercepted by ultrafiltration,which poses significant challenges to the effluent quality and sustainability of ultrafiltration ***,we develop a cobalt single-atom catalyst-tailored ceramic membrane(Co1-NCNT-CM)in conjunction with an activated peroxymonosulfate(PMS)system,achieving excellent EOCs degradation and anti-fouling *** interfacial reaction mechanism effectively mitigates membrane fouling through a repulsive interaction with natural organic *** generation of singlet oxygen at the Co-N3-C active sites through a catalytic pathway(PMS/PMS*/OH*/O*/OO*/1 O_(2))exhibits selective oxidation of phenols and sulfonamides,achieving>90%removal *** findings elucidate a multi-layered functional architecture within the Co1-NCNT-CM/PMS system,responsible for its superior performance in organic decontamination and membrane maintenance during secondary effluent *** highlights the power of integrating Co1-NCNT-CM/PMS systems in advanced wastewater treatment frameworks,specifically for targeted EOCs removal,heralding a new direction for sustainable water management.

关键词： Single-atom catalytic ceramic membrane Peroxymonosulfate activation Selective oxidation Interfacial response Multi-layer functional zones

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Research of Satellite Clock Error Prediction Based on RBF Neural Network and ARMA Model

Research of Satellite Clock Error Prediction Based on RBF Ne...

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第四届中国卫星导航学术年会

作者： Xiaoyu Li Xurong Dong Kun Zheng yatao liu Academy of Equipment

As the main error sources of the observation data, the precision of prediction model has a direct effect on the performance of navigation system. Considering that the clock error was composed of trend part and random component, an integrated model was proposed, which was based on RBF neural network and ARMA. The trend was modeled using the RBF neural network, while the random part by the ARMA model, and last added them to the predicted results. The simulation results validate the feasibility and the better performance of the integrated method through an example by using the precise IGS clock data.

关键词： clock error prediction·RBF neural network·ARMA·integrated model

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国际图联《图书馆投资回报率——近10年案例回顾》解读与启示

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图书与情报 2020年第5期 104-110页

作者：刘亚涛鄂尔多斯市鄂托克旗图书馆内蒙古鄂尔多斯016100

2020年7月,国际图联发布《图书馆投资回报率——近10年案例回顾》报告,概述了过去十年来全球各地公共图书馆、高校图书馆和专业图书馆投资回报率(ROI)的研究与评估实践,总结了不同类型图书馆评估其工作价值和投资回报率的多种方法。文... 详细信息

2020年7月,国际图联发布《图书馆投资回报率——近10年案例回顾》报告,概述了过去十年来全球各地公共图书馆、高校图书馆和专业图书馆投资回报率(ROI)的研究与评估实践,总结了不同类型图书馆评估其工作价值和投资回报率的多种方法。文章通过深入解读该报告,认为当前我国图书馆应转变观念,重视经济价值评估研究,将经济价值评估变成图书馆的自主行为,并能够常态化、周期性开展;在评估活动开展过程中,行业协会要发挥倡导和组织作用,并联合专业评估机构参与评估,使评估过程科学可信;同时还要注意因地制宜,根据我国国情和图书馆特点选择并逐步改进评估方法。

关键词：国际图联投资回报率社会投资回报经济价值评估

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Machinery Fault Diagnosis for Imbalanced Samples via Coupled Generative Adversarial Networks

Machinery Fault Diagnosis for Imbalanced Samples via Coupled...

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第43届中国控制会议

作者： yatao liu Xinliang Zhang Yanqi Wang Yitian Zhou Lijie Jia School of Electrical Engineering and Automation Henan Key Laboratory of Intelligent Detection and Control of Coal Mine EquipmentHenan Polytechnic University Anhui Institute of Information Technology Zhoushan Yangwangnaxin Technology Co.Ltd

When applying deep learning networks to the machinery fault diagnosis, it is crucial to train the networks under the sufficient fault samples. To achieve such condition under the imbalance samples, it is essential for the generative networks to learn a complete distribution for the imbalanced samples. Existing data augmentation methods often employ generative models directly to reconstruct samples. Under the limited number of samples, it is a challenge to achieve discriminative features for the fault due to the sample underrepresentation. To address this issue, this paper introduces an innovative approach using coupled generative adversarial networks(CoGAN). The CoGAN framework integrates several systematic enhancements to enhance the robustness of the generative adversarial networks. Firstly, to tackle the imbalance between fault and normal sample distributions,parallel coupled networks are employed to jointly learn their distributions. These networks share weights in the extraction layers of the generator, serving as a representative feature distribution generator for the raw samples. Secondly, a one-sided label smoothing strategy is adopted to mitigate model overfitting in scenarios with limited samples. Finally, historical averaging and gradient penalty are incorporated into the cost function to mitigate adversarial vulnerabilities, ensuring a more stable training performance. Experimental results on the roll bearing dataset from Case Western Reserve University demonstrate that the proposed approach consistently achieves higher accuracy compared to state-of-the-art models across different training sample sizes. This effectively enhances fault diagnosis performance and significantly reduces the dependency on extensive training data.

关键词： deep learning,imbalanced samples fault diagnosis coupled generative model adversarial networks gradient penalty

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采暖季室内外细颗粒物关系的关键影响因素分析

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北京大学学报（自然科学版） 2016年第5期52卷 931-938页

作者：吴亚涛刘兆荣北京大学环境科学与工程学院北京100871

于2014年2—3月和11—12月对室内外环境中细颗粒物进行采集和分析,研究通风条件、大气污染水平以及温、湿度等因素对细颗粒物室内外关系的影响。研究表明,通风条件和大气污染水平是影响细颗粒物室内外关系的重要因素,对细颗粒物的I/O、... 详细信息

于2014年2—3月和11—12月对室内外环境中细颗粒物进行采集和分析,研究通风条件、大气污染水平以及温、湿度等因素对细颗粒物室内外关系的影响。研究表明,通风条件和大气污染水平是影响细颗粒物室内外关系的重要因素,对细颗粒物的I/O、室内外相关系数、细颗粒物的渗透因子以及大气细颗粒物对室内的贡献率均有影响,通风条件越好,I/O越高,室内外相关系数和室外贡献率也越大;随着大气细颗粒物浓度的升高,细颗粒物I/O比值有升高的趋势,且其波动范围逐渐减小,室内外细颗粒物之间的相关性逐渐增强,室外贡献率逐渐增大,但增速逐渐减缓。温、湿度均对细颗粒物室内外关系的影响较小。

关键词：室内外关系细颗粒物相关系数 I/O 室外贡献率

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油水两相流中超声振动表面油滴的脱附行为

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工程热物理学报 2022年第6期43卷 1609-1616页

作者：赵芳王瑶刘亚涛闫倩倩上海应用技术大学城市建设与安全工程学院上海201418

对油水两相流中超声振动表面油滴的脱附行为进行数值模拟及微观可视化实验,研究超声作用下油滴的变形及运动状态,探讨声流及空化微射流等机制对油滴脱附行为的强化作用,进而分析入射声压、微射流速度对油滴脱附速率的影响。结果表明:超... 详细信息

对油水两相流中超声振动表面油滴的脱附行为进行数值模拟及微观可视化实验,研究超声作用下油滴的变形及运动状态,探讨声流及空化微射流等机制对油滴脱附行为的强化作用,进而分析入射声压、微射流速度对油滴脱附速率的影响。结果表明:超声作用下油滴受到声流曳力及声流回流产生的剪切力,脱附效率明显提高,且随着入射声压的增大,油滴脱附速度也逐渐增大,当入射声压幅值从0.8 MPa提高到1.4 MPa时,油滴脱附时间缩短41.8%。此外,超声空化产生的微射流也是强化油滴脱附的重要影响机制,贴壁微射流对吸附油滴产生强烈冲击,加速了油滴从壁面剥离,并与声流协同作用下有效加速油滴的脱附过程。

关键词：超声波声流微射流油滴脱附

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煤的挥发分的准确测定及影响因素

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同煤科技 2009年第2期 24-26页

作者：刘亚桃大同煤矿集团公司煤气厂

结合煤的挥发分测定的实际情况,分析影响测定准确度的因素,提出了要注意的事项。

关键词：煤挥发分挥发分测定准确度影响因素

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戍守与布防:明代云南府及其卫所分布探析

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昆明学院学报 2022年第1期44卷 25-31页

作者：刘亚涛云南民族大学云南省民族研究所云南昆明650500

明代云南府是云南布政使司的政治、交通、军事中心,自然也是朝廷着力经营之地。作为稳定明朝在整个云南地区统治的基石,自明太祖洪武十五年(1382年)平定云南后,明廷就开始在云南府部署大量的军事卫所。在设置上,云南府的卫所主要依托重... 详细信息

明代云南府是云南布政使司的政治、交通、军事中心,自然也是朝廷着力经营之地。作为稳定明朝在整个云南地区统治的基石,自明太祖洪武十五年(1382年)平定云南后,明廷就开始在云南府部署大量的军事卫所。在设置上,云南府的卫所主要依托重要交通线和军事要地进行布防,呈现出典型的"内重外轻"分布格局;诸卫所之间互相策应、彼此联防,构筑起严密的军事体系,反映了当时明廷对云南地区的经略意图。

关键词：明代云南府卫所戍守布防

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