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Science China(Technological Sciences) 2022年第2期65卷 481-489页

作者： LEI SaiLing wang LiMing wang rongwu QIN XiaoHong YU JianYong Key Laboratory of Textile Science&Technology Ministry of EducationCollege of TextilesDonghua UniversityShanghai 201620China Innovation Center for Textile Science and Technology Donghua UniversityShanghai 201620China

Electrospun nanofibers are regarded as a promising candidate for filtration because of their prominent size effect.The precise control of nanofiber diameter is the key to the material’s outstanding filtration capability,but it remains a challenge.Herein,an electrohydrodynamic scaling model is established for the accurate prediction of fiber diameter based on the velocity of the whipping jet.In this model,the velocity reflects jet stretching and is tuned by adding salt.The theoretical predictions agree well with the experimental results.With the proposed diameter model,the filtration property of the membrane is significantly optimized by governing the fiber diameter.When the nanofiber is slenderized to 183 nm,an ultralight (0.521 g m;) membrane exhibits high filtration efficiency (99.93%) and low pressure drop (105.2 Pa) against ultrafine aerosol particles (≤0.26μm) under an airflow face velocity of 5.33 cm s^(-1).These findings demonstrate that the established surface charge-based diameter model provides an excellent platform to timely and accurately control the nanofiber diameter via the velocity of whipping jets for highefficiency air filtration.

关键词： electrospinning jet velocity fiber diameter filtration

Flexible, self-cleaning, and high-performance ceramic nanofiber-based moist-electric generator enabled by interfacial engineering

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Science China(Technological Sciences) 2022年第2期65卷 450-457页

作者： wang LiMing FENG LanLan SUN Zhao Yang HE XinYang wang rongwu QIN XiaoHong YU JianYong Key Laboratory of Textile Science&Technology Ministry of EducationCollege of TextilesDonghua UniversityShanghai 201620China Innovation Center for Textile Science and Technology Donghua UniversityShanghai 201620China

Due to their long-term stability, even under extreme conditions, oxide ceramics have attracted significant attention in emerging fields like moist-electric generation. However, the inherent brittleness and low voltage output of oxide ceramic-based moistelectric generators(MEGs) limit their applications in wearable electronics. Herein, a facile strategy involving the combination of sol-gel electrospinning and calcination is used to fabricate flexible and freestanding Ti O_(2)/Zr O_(2)(TZ) composite nanofiber-based MEGs. The excellent flexibility of the TZ nanofiber membranes can be attributed to the suppression of their crystal structure transformation, dispersion of stress concentration, and reduction of crack propagation via interfacial engineering. The porous structure of the electrospun nanofiber membrane features an abundance of charged narrow channels for the diffusion of water molecules and generates a streaming potential. The optimal voltage output reached ~0.8 V, which is the highest value reported for an oxide ceramic-based MEG. Furthermore, the as-fabricated nanofiber-based MEG exhibits good self-cleaning capability to degrade organic pollutants under ultraviolet irradiation. By integrating mechanical flexibility, high performance, and a selfcleaning effect, this work presents a new idea for exploring diverse, efficient, and wearable oxide ceramic-based MEGs.

关键词： moist-electric generation ceramic nanofiber electrospinning flexible self-cleaning

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沉井法在变电站事故集油池工程中的应用研究

湖北电力 2024年第1期48卷 91-97页

作者：杜荣武王子明翟伟湖北省电力规划设计研究院有限公司湖北武汉430040

在变电站改扩建工程中,事故集油池等地下水池结构的施工场地条件受限,基坑开挖极易对周边的已有建、构筑物造成影响。因此,提出了一种事故集油池沉井施工工艺,可用于各电压等级的新建或改、扩建变电站工程中。该施工工艺将事故集油池设... 详细信息

在变电站改扩建工程中,事故集油池等地下水池结构的施工场地条件受限,基坑开挖极易对周边的已有建、构筑物造成影响。因此,提出了一种事故集油池沉井施工工艺,可用于各电压等级的新建或改、扩建变电站工程中。该施工工艺将事故集油池设计为井筒状结构,通过沉井法施工池壁开挖土体,由井壁的自重作用克服土壤摩阻力下沉,最后在池壁设计标高位置封底,并施工事故集油池顶板及其他附属设施。事故集油池沉井法具备施工安全风险较低、施工操作面较小、无需额外基坑支护、对邻近建构筑物影响小等优点。在新疆某变电站扩建工程中成功应用事故集油池沉井施工工艺,缩短了施工工期并产生了较高的经济效益。

关键词：沉井法事故集油池基坑变电站

Circulating Current Suppression for MMC-HVDC Systems with Asymmetric Arm Impedance

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CSEE Journal of Power and Energy Systems 2021年第3期7卷 530-540页

作者： Fujin Deng Qian Heng Chengkai Liu Yongqing Lyu Qingsong wang Dan Liu rongwu Zhu School of Electrical Engi-neering Southeast Universityand Jiangsu Key Laboratory of Smart Grid Technology and EquipmentNanjing 210096China School of Electrical Engineering Southeast UniversityNanjing 210096China State Grid Jiangsu Electric Power CO. LTD.Research InstituteNanjing 211106China Department of Power Electronics Christian-Albrechts-University of KielKiel2D-24142Germany

The modular multilevel converter(MMC)has been a highly promising topology in the high-voltage direct-current(HVDC)transmission area,where each arm of the MMC may consist of hundreds of series-connected submodules and an inductor.Due to its parameter inaccuracy,component aging,and so on,the component parameter in different arms of the MMC may be different,which may cause circulating current in the MMC-HVDC transmission system,and result in current deterioration,power losses,and electromagnetic interference,etc.In this paper,the circulating current suppressing(CCS)in the MMC-HVDC system,due to asymmetric arm impedance,is analyzed.Based on the mathematical analysis,a method of using an auxiliary circuit is proposed for the MMC to realize the CCS and improve the performance of the MMC-HVDC system.Simulation studies are conducted with PSCAD/EMTDC in the HVDC system,which confirms the feasibility of the proposed method.

关键词： Circulating current suppressing control strategy high-voltage direct-current modular multilevel converter

Shadow–highlight feature matching automatic small crater recognition using high-resolution digital orthophoto map from Chang’E Missions

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Acta Geochimica 2019年第4期38卷 541-554页

作者： Wei Zuo Chunlai Li Lingjie Yu Zhoubin Zhang rongwu wang Xingguo Zeng Yuxuan Liu Yaying Xiong Key Laboratory of Lunar and Deep Space Exploration National Astronomical ObservatoriesChinese Academy of SciencesBeijing 100101China School of Astronomy and Space Sciences University of Chinese Academy of SciencesBeijing 100049China School of Textile Science and Engineering Xi'an Polytechnic UniversityXi'an 710048China College of Textiles Donghua UniversityShanghai 200051China

This paper introduces a new method of small lunar craters’ automatic identification, using digital orthophoto map(DOM) data. The core of the approach is the fact that the lunar exploration DOM data reveal contrasting highlight and shadow characteristics of small craters under sunlight irradiation. This research effort combines image processing and mathematical modeling. Overall it proposes a new planetary data processing approach, to segment and extract the highlight and shadow regions of small craters,using the image gray frequency(IGF) statistical method.IGF can also be applied to identify the coupling relationships between small craters’ shape and their relative features. This paper presents the highlight and shadow pair matching(HSPM) model which manages to perform highprecision automatic recognition of small lunar craters.Testing was performed using the DOM data of Chang’E-2(CE-2). The results have shown that the proposed method has a high level of successful detection rate. The proposed methodology that uses DOM data can complement the drawbacks of the digital elevation model(DEM) that has a relatively high false detection rate. A hybrid fusion model(FUM) that combines both DOM and DEM data, was carried out to simultaneously identify small, medium, and large-sized craters. It has been proven that the FUM generally shows stronger recognition ability compared to previous approaches and it can be adapted for high precision identification of craters on the whole lunar surface.The results meet the requirements for a reliable and accurate exploration of the Moon and the planets.

关键词： Moon Crater recognition Image processing Space exploration

Three-Dimensional Model Reconstruction of Nonwovens from Multi-Focus Images

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Journal of Donghua University(English Edition) 2022年第3期39卷 185-192页

作者：董改革王荣武李成族尤祥银 College of Textiles Donghua University Shanghai 201620 China Jiangsu Liyang New Material Co. Ltd. Nantong 226004 China

The three-dimensional(3D)model is of great significance to analyze the performance of nonwovens.However,the existing modelling methods could not reconstruct the 3D structure of nonwovens at low cost.A new method based on deep learning was proposed to reconstruct 3D models of nonwovens from multi-focus images.A convolutional neural network was trained to extract clear fibers from sequence images.Image processing algorithms were used to obtain the radius,the central axis,and depth information of fibers from the extraction results.Based on this information,3D models were built in 3D space.Furthermore,self-developed algorithms optimized the central axis and depth of fibers,which made fibers more realistic and continuous.The method with lower cost could reconstruct 3D models of nonwovens conveniently.

关键词： three-dimensional(3D)model reconstruction deep learning microscopy nonwoven image processing

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分离式立交桥梁结构顶升施工技术的研究

建筑技术开发 2024年第2期51卷 103-105页

作者：王斌中交瑞通路桥养护科技有限公司西安710065

交通基建设施发展致使线路交叉的情况越来越多,新建线路下穿既有线路具有净空要求,在某些限制条件下就需要对既有线路的桥梁进行顶升以解决现有净高不足的问题。依托某分离式立交上跨荣乌高速公路工程,梳理桥梁顶升的主要内容,介绍桥梁... 详细信息

交通基建设施发展致使线路交叉的情况越来越多,新建线路下穿既有线路具有净空要求,在某些限制条件下就需要对既有线路的桥梁进行顶升以解决现有净高不足的问题。依托某分离式立交上跨荣乌高速公路工程,梳理桥梁顶升的主要内容,介绍桥梁结构整体顶升施工技术流程,归纳桥梁结构整体顶升施工技术的各项要点,并对桥梁结构整体顶升施工技术的全过程进行监测分析。通过应用本技术成功解决了某分离式立交上跨荣乌高速公路净空不足的问题,研究结果可对今后的桥梁维护与加固工作提供借鉴。

关键词：桥梁工程顶升技术施工技术

聚醚砜微纳米纤维防水透湿材料的制备及性能分析

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产业用纺织品 2023年第1期41卷 30-37页

作者：杨淼王荣武东华大学纺织学院上海201620

探讨了利用无针静电纺丝技术制备聚醚砜(PES)微纳米纤维防水透湿材料的方法。PES在N,N-二甲基甲酰胺(DMF)溶剂中溶解1~2 h后黏度即增大,并出现结块现象,难以用于产业化静电纺丝。经过优选,以N-甲基吡咯烷酮(NMP)为溶剂,当PES质量分数为... 详细信息

探讨了利用无针静电纺丝技术制备聚醚砜(PES)微纳米纤维防水透湿材料的方法。PES在N,N-二甲基甲酰胺(DMF)溶剂中溶解1~2 h后黏度即增大,并出现结块现象,难以用于产业化静电纺丝。经过优选,以N-甲基吡咯烷酮(NMP)为溶剂,当PES质量分数为20%时,纺丝溶液的黏度为0.153 Pa·s,可在9 h内获得良好的的流动性和可纺性。基于此纺丝液配方,制备给液速度分别为0.3、0.9、1.5和2.1 m/min的PES微纳米纤维防水透湿材料,并对其表观形态、孔径、透气性、接触角、透湿性和拉伸性能进行测试,发现所得纤维材料的平均直径为242~345 nm,孔径为9.109 1~9.511 5μm,透气率为59.73~219.95 mm/s,接触角大于140°,透湿率为5 749~7 033 g/(m^(2)·d),断裂强力为21.0~31.0 N,具有较好的疏水性和透湿性。研究可为无针静电纺产业化制备PES微纳米纤维防水透湿材料提供指导和借鉴。

关键词：聚醚砜(PES) 微纳米纤维无针静电纺丝防水透湿

基于二价阳离子去除的胞外聚合物提取方法特性比较

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环境科学学报 2022年第10期42卷 303-313页

作者：王彬斌于滨玮何锋李军王长智梅荣武浙江工业大学环境学院杭州310000 浙江省生态环境科学设计研究院杭州310000 浙江省环境污染控制技术研究重点实验室杭州310000

胞外聚合物(EPS)在决定活性污泥机械稳定性及理化性质方面发挥着重要作用,对EPS的深入研究和理解有利于更好地认识活性污泥絮体的结构、功能和性质.对EPS高效低损的提取是EPS异位研究的重要前提,而基于二价阳离子去除的EPS提取方法是重... 详细信息

胞外聚合物(EPS)在决定活性污泥机械稳定性及理化性质方面发挥着重要作用,对EPS的深入研究和理解有利于更好地认识活性污泥絮体的结构、功能和性质.对EPS高效低损的提取是EPS异位研究的重要前提,而基于二价阳离子去除的EPS提取方法是重要途径之一.本研究分别以实际污水厂和实验室生物反应器活性污泥为EPS提取对象,对阳离子交换树脂(CER)法、乙二胺四乙酸(EDTA)法和柠檬酸钠(SC)法的EPS提取特性进行比较,从而系统梳理基于二价阳离子去除的EPS提取法的不同特点.结果表明,SC法具有最高的EPS提取效率,其EPS提取总量是CER法的1.36~1.53倍,是EDTA法的1.98~2.39倍;蛋白质仍然是3种提取法所得EPS的主要组分,但CER法具有最高的蛋白/多糖比,SC法次之,而EDTA法最低,且高的EPS提取量伴随着高的DNA含量;CER法对EPS组分的扰动最小,可以最大限度地保持EPS组分的原有特性,而EDTA法和SC法会破坏EPS中大分子组分及芳香族蛋白质的分子结构,从而显著改变EPS分子量分布和荧光特性;EPS提取过程中外源提取剂的投加将显著影响EPS分子结构中的官能团分布特性,EDTA法和SC法显著增加了EPS分子结构中C=O(或O=C)的含量,且EDTA法还增加了EPS分子结构中质子化N的含量.本研究的开展将有助于深入理解基于二价阳离子去除的EPS提取效应,为相关方法的应用提供更广泛的理论和技术支持.

关键词：胞外聚合物(EPS) 二价阳离子活性污泥提取特性

分级多孔碳纳米纤维用于高效太阳能驱动水净化

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中国科学:材料科学(英文版) 2023年第8期66卷 3310-3318页

作者：罗清亮羊燚汪康康俞建勇王荣武季东晓覃小红 Key Laboratory of Textile Science and Technology of Ministry of Education College of TextilesDonghua UniversityShanghai 201620China Innovation Center for Textile Science and Technology Donghua UniversityShanghai 201620China

碳材料通常用于太阳能水蒸发,因为它们可以吸收宽带光并有效地产生热量.然而,具有光滑表面的传统碳材料受到大约10%的中等反射的限制,损失了反射能量.在此,我们提出了一种多界面策略,以提高碳纳米纤维(CNFs)的固有光吸收,从而实现更高... 详细信息

碳材料通常用于太阳能水蒸发,因为它们可以吸收宽带光并有效地产生热量.然而,具有光滑表面的传统碳材料受到大约10%的中等反射的限制,损失了反射能量.在此,我们提出了一种多界面策略,以提高碳纳米纤维(CNFs)的固有光吸收,从而实现更高效的太阳能驱动水净化.通过简单的牺牲模板方法,在CNFs中引入分级孔来构建多个界面得到高表面粗糙度碳纳米纤维(HPCNFs).由于高表面粗糙度和源自分级孔的丰富内部空气介电界面,HPCNFs在宽带光(300–2500 nm)吸收显著改善,高达97.62%,这使得在1个太阳光照下的太阳光转换为蒸汽的效率达到96.13%,蒸发率高达1.78 kg m^(-2)h^(−1),超过了大多数相关的纯碳材料.当用于太阳能水蒸发脱盐时,HPCNF膜表现出对离子的高度排斥(<0.05 mg L^(−1)盐离子),并以每天11.18 kg m^(-2)的速率从湖中产生淡水,足以满足4–5个人的日常需求.这项工作为高效碳基太阳能水蒸发材料的设计提供了一种简便策略.

关键词：牺牲模板碳纳米纤维表面粗糙度水净化蒸发材料碳材料光滑表面水蒸发