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Emission and optical characteristics of brown carbon in size-segregated particles from three types of Chinese ships

Journal of Environmental Sciences 2024年第8期142卷 248-258页

作者： Fengqin Yang Fan Zhang Zeyu Liu Yingjun Chen Yan Zhang Can Wu Yali Lei Shijie Liu Binyu Xiao xinyi wan Yubao Chen Yong Han Min Cui Cheng Huang Gehui wang Key Lab of Geographic Information Science of the Ministry of Education School of Geographic SciencesEast China Normal UniversityShanghai 200241China Institute of Eco-Chongming 20 Cuiniao Rd.ChongmingShanghai 202150China State Environmental Protection Key Laboratory of Formation and Prevention of the Urban Air Pollution Complex Shanghai Academy of Environmental SciencesShanghai 200233China Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention(LAP3) Department of Environmental Science and EngineeringFudan UniversityShanghai 200438China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092China Department of Civil and Environmental Engineering and State Key Laboratory of Marine Pollution The Hong Kong Polytechnic UniversityKowloon 100872Hong KongChina College of Environmental Science and Engineering Yangzhou UniversityYangzhou 225009China

Brown carbon(BrC)is one of the important light absorption substances that have high light absorption ability under short wavelength ***,limit studies have focused on the BrC emission from *** this study,size-segregated particulate matters(PM)were collected from three different types of ships,light absorption characteristics and size distribution of methanol-soluble BrC and water-soluble BrC in PM from ship exhausts were *** showed that four-stroke low-power diesel fishing boat(4-LDF)had the highest mass concentrations of methanol-soluble organic carbon(MSOC)and water-soluble organic carbon(WSOC),followed by 2-stroke high-power heavy-fuel-oil vessel(2-HHV),and fourstroke high-power marine-diesel vessel(4-HMV).While 2-HHV had obviously higher light absorption coefficients of methanol-soluble BrC(Abs365,M)and water-soluble BrC(Abs365,W)in unit weight of PM than the other two types of *** tested ships presented comparable or higher absorption efficiency of BrC in water extracts(MAE365,W)compared with other BrC emission *** of BrC was concentrated in fine particles,and the particle size distributions of both Abs365,Mand Abs365,Wshowed bimodal patterns,peaking at0.43–0.65μm and 4.7–5.8μm,***,different particle size distributions were found for MAE365,Mbetween diesel and heavy fuel oil ***,different wavelength dependence in particles with different size were also *** exhaust could be confirmed as a non-ignorable BrC emission source,and complex influencing factor could affect the light absorption characteristics of ship *** size should also be considered when light absorption ability of BrC was evaluated.

关键词： Ship emission Brown carbon Light absorption Size distribution

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广州市制造业和服务业协同发展的影响机制及经济效应研究

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城市观察 2024年第3期91卷 68-83,160页

作者：罗嘉雯崔文晓万欣怡华南理工大学工商管理学院中泰证券股份有限公司

本研究基于2011-2020年广州市101家上市企业的面板数据,从微观层面探究广州市制造业和服务业间的协同集聚效应,并进一步分析制造业与服务业协同发展的影响因素和经济效应。通过复合协同度模型和时间序列模型的分析结果表明,广州市制造... 详细信息

本研究基于2011-2020年广州市101家上市企业的面板数据,从微观层面探究广州市制造业和服务业间的协同集聚效应,并进一步分析制造业与服务业协同发展的影响因素和经济效应。通过复合协同度模型和时间序列模型的分析结果表明,广州市制造业和服务业整体上协同效果较弱且缺少稳定性,在相同基期的统计口径下二者于2018年进入并保持基本协同阶段;在相邻基期的统计口径下二者仅在2018年达到过中度协同演变,其他观察期内均为非协同演变到低度协同演变的阶段。此外,广州市制造业与服务业协同发展对区域经济高质量发展具有促进作用,并且受到产业结构优化升级、研发资金投入以及市场开放水平的积极影响。

关键词：制造业服务业产业协同效应经济效应高质量发展

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Thermal insulating and fire-retardant Si_(3)N_(4) nanowire membranes resistant to high temperatures up to 1300℃

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Journal of Materials Science & Technology 2023年第24期155卷 82-88页

作者： Yeye Liu Leilei Zhang Ruonan Zhang Siqi Shao Lina Sun xinyi wan Tiantian wang State Key Laboratory of Solidification Processing Shaanxi Key Laboratory of Fiber Reinforced Light Composite MaterialsNorthwestern Polytechnical UniversityXi’an 710072China

Superior thermal insulating and fire-retardant ceramic membranes are urgently demanded in the aerospace,construction,and chemical engineering ***,the generic characteristics of ceramic membranes,such as brittleness,structural collapse,and crystallization-induced pulverization behavior,present a great plague to their practical ***,we report a highly flexible,mechanically stable,fire-retardant,and high-temperature-resistant ceramic membrane based on the interlocked Si_(3)N_(4) nanowires formed by the precursor pyrolysis *** Si_(3)N_(4) nanowire membrane(SNM)has excellent high-temperature resistance under alcohol lamps and butane spray *** thermal insulation with a thermal conductivity as low as 0.056 W m^(-1)K^(-1)can be attributed to the high porosity of SNM,which makes it a desirable candidate for heat insulators under harsh *** importantly,SNM exhibits thermal stability and robust mechanical properties in the range of 25 to 1300℃.The high-temperature resistance of SNM up to 1300℃is achieved by the four stages:Si3 N4 nanowires,Si_(3)N_(4)@SiO_(2) nanowires,SiO_(2) nanowires,and bead-like SiO_(2) *** heat-treated at 1300℃,the macroscopic size of SNM does not change significantly,and the interlocked structure is still ***,SNM still maintains excellent mechanical properties,with tensile strength as high as 0.26 *** work provides a facile method for fabricating excellent thermal insulating and fire-retardant ceramic membranes,showing prospective application prospects in the era of thermal insulating materials.

关键词： Silicon nitride nanowires Thermal insulation Fire-resistance High-temperature resistance

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改性处理对牛蒡根膳食纤维结构和功能特性的影响

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食品工业科技 2024年第18期45卷 63-71页

作者：李益臻宋欣欣马恺扬张见万欣怡冯进陈小娥李莹方旭波浙江海洋大学食品与药学学院浙江舟山316022 江苏省农业科学院农产品加工研究所江苏南京210014 南京农业大学食品科技学院江苏南京210095 白马未来食品研究院江苏南京211225 常熟理工学院生物与食品工程学院江苏常熟215500 浙江国际海运职业技术学院浙江舟山316021

本研究旨在通过超声联合过氧化氢改性处理牛蒡根膳食纤维,期望实现其水合特性及功能特性的双向提升。以牛蒡根膳食纤维为研究对象,分别采用超声、碱性过氧化氢、超声-碱性过氧化氢、碱性过氧化氢-超声的方式对其进行改性处理,探究不同... 详细信息

本研究旨在通过超声联合过氧化氢改性处理牛蒡根膳食纤维,期望实现其水合特性及功能特性的双向提升。以牛蒡根膳食纤维为研究对象,分别采用超声、碱性过氧化氢、超声-碱性过氧化氢、碱性过氧化氢-超声的方式对其进行改性处理,探究不同改性方法对牛蒡根膳食纤维结构和功能特性的影响。结果表明,通过功率200 W、时间10 min的超声条件与pH11、5%体积分数的过氧化氢处理牛蒡根膳食纤维的膨胀力和持水力均显著(P<0.05)提高,其中碱性过氧化氢-超声处理后效果最佳;粒径分布、扫描电子显微镜分析结果表明,经过碱性过氧化氢-超声处理后的膳食纤维粒径最小,表面结构疏松多孔;X射线衍射、傅里叶变换红外光谱分析表明,碱性过氧化氢-超声的膳食纤维相对结晶度最低,部分纤维素组分重新分布,向可溶性膳食纤维转化;热重分析表明,碱性过氧化氢-超声处理的膳食纤维热稳定性得到改善;体外抗氧化、α-淀粉酶与α-葡萄糖苷酶抑制实验表明,改性前后的膳食纤维均具有较强的抗氧化能力和糖消化酶抑制能力,其中碱性过氧化氢-超声处理的膳食纤维对DPPH、ABTS+自由基清除能力最强,半数抑制浓度(Median Inhibition Concentration,IC_(50))分别为1.07和0.89 mg/mL;对α-淀粉酶与α-葡萄糖苷酶的抑制作用最佳,其IC_(50)分别为2.00和1.32 mg/mL。综上所述,碱性过氧化氢-超声改性是提升牛蒡根膳食纤维水合特性及功能特性的优良方法,可为牛蒡根膳食纤维理化特性的精准利用及功能食品研发提供理论依据。

关键词：超声碱性过氧化氢牛蒡根膳食纤维功能特性结构

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Design of High Performance MXene/Oxide Structure Memristors for Image Recognition Applications

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Chinese Journal of Electronics 2024年第2期33卷 336-345页

作者： Xiaojuan LIAN Yuelin SHI xinyi SHEN Xiang wan Zhikuang CAI Lei wanG The College of Integrated Circuit Science and Engineering Nanjing University of Posts and Telecommunications The National and Local Joint Engineering Laboratory of RF Integration and Micro-Assembly Technology Nanjing University of Posts and Telecommunications

Recent popularity to realize image recognition by memristor-based neural network hardware systems has been witnessed owing to their similarities to neurons and ***,the stochastic formation of conductive filaments inside the oxide memristor devices inevitably makes them face some drawbacks,represented by relatively higher power consumption and severer resistance switching *** this work,we design and fabricate the Ag/MXene（Ti3C2）/SiO2/Pt memristor after considering the stronger interactions between Ti3C2and Ag ions,which lead to a Ti3C2/SiO2structure memristor owning to much lower "SET" voltage and smaller resistance switching fluctuation than pure ***,the conductances of the Ag/Ti3C2/SiO2/Pt memristor have been modulated by changing the number of the applied programming pulse,and two typical biological behaviors,i.e.,longterm potentiation and long-term depression,have been ***,device conductances are introduced into an integrated device-to-algorithm framework as synaptic weights,by which the MNIST hand-written digits are recognized with accuracy up to 77.39%.

关键词： Performance evaluation Silicon compounds Image recognition Power demand Memristors Switches Programming

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Optical-switched proton logic gate:Indocyanine green decorated HSB-W5 MOFs nanosheets

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Science China Materials 2022年第4期65卷 1076-1086页

作者： Shuaikang Fan Shilin wang Xiaobin wang xinyi wan Zhou Fang Xiaodong Pi Zhizhen Ye Xinsheng Peng State Key Laboratory of Silicon Materials School of Materials Science and EngineeringZhejiang UniversityHangzhou310027China Wenzhou Key Laboratory of Novel Optoelectronic and Nanomaterials Institute of WenzhouZhejiang UniversityWenzhou325006China

Proton conduction controlled by light is important for advanced applications in sensors and information processing *** herein report a metal-organic framework(MOF)thin film by introducing indocyanine green dye into HSB-W5(HSB=hydrogenated Schiff base)matrix(ICG@HSB-W5)to construct a series of basic logic gates(NOT,NAND,and NOR)on account of its good photothermal conversion ability and photo-controlled proton *** proton conductivity of ICG@HSB-W5 thin film is 25 times higher than that of the pristine HSB-W5 thin film and responses efficiently to *** addition,the change of proton conductivity is very large with an ON/OFF ratio above1000 and enough to be distinguished to build logic *** this logic gate system,808-and 405-nm lasers are used as inputs and the proton conductivity is used as output signal with different *** electrical output signal is convenient and available to be received and *** offers a new route for the design of molecular logic gates based on MOF and facilitates the construction of proton-based logic gate or more complicated logic devices.

关键词： HSB-W5 MOF proton conductivity indocyanine green logic gate photothermal effect

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Photogated proton conductivity of ZIF-8 membranes co-modified with graphene quantum dots and polystyrene sulfonate

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Science China Materials 2021年第8期64卷 1997-2007页

作者： Shuaikang Fan Shilin wang Xiaobin wang Zhuoyi Li Xu Ma xinyi wan Shabab Hussain Xinsheng Peng State Key Laboratory of Silicon Materials School of Materials Science and EngineeringERC of Membrane and Water TreatmentMinistry of EducationZhejiang UniversityHangzhou 310027China

Smart proton conductive metal-organic framework(MOF) membranes with dynamic remote control over proton conduction show high potential for use in advanced applications, such as sensors and bioprocesses. Here, we report a photoswitchable proton conductive ZIF-8 membrane by coencapsulating polystyrene sulfonate and graphene quantum dots into a ZIF-8 matrix(GQDs-PSS@ZIF-8) via a solidconfined conversion process. The proton conductivity of the GQDs-PSS@ZIF-8 membrane is 6.3 times higher than that of pristine ZIF-8 and can be reversibly switched by light due to photoluminescence quenching and the photothermal conversion effect, which converts light into heat. The local increase in temperature allows water molecules to escape from the porous channels, which cuts off the proton transport pathways and results in a decrease in proton conductivity. The proton conductivity is restored when the light is off owing to regaining water molecules, which act as proton carriers, from the surroundings. The GQDs-PSS@ZIF-8 membrane responds efficiently to light and exhibits an ON/OFF ratio of 12.8. This photogated proton conduction in MOFs has potential for the development and application of MOF-based protonic solids in advanced photoelectric devices.

关键词： ZIF-8 graphene quantum dots photoswitchable proton conductivity photoluminescence quenching photothermal conversion

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异经弹力织物的设计与生产

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棉纺织技术 2007年第12期35卷 1-3页

作者：万新义河南省许昌豫中纺织有限公司

探讨两种不同号数经纱弹力织物的生产工艺和技术措施。为保证异经弹力织物的顺利生产，在选择原纱时，经纱的强力、结杂、条干等指标要达到Uster2001 25％～50％水平，弹力纬纱也要求条干好，结杂少，纱疵少，强力达到要求。络筒工序要... 详细信息

探讨两种不同号数经纱弹力织物的生产工艺和技术措施。为保证异经弹力织物的顺利生产，在选择原纱时，经纱的强力、结杂、条干等指标要达到Uster2001 25％～50％水平，弹力纬纱也要求条干好，结杂少，纱疵少，强力达到要求。络筒工序要注意纱线通道光洁，保持筒子成形良好；整经工序要实行“小张力、中速度、匀卷绕”的工艺原则，保证张力均匀一致；浆纱工序要采用双浆槽，且两个浆槽的主压浆辊压力分别进行设置；织造工序应采用“低后梁、大张力、早开口、强打纬”工艺。通过优选织前准备及织造工艺，使织机生产效率达到90％左右，入库一等品率达到98．5％左右。

关键词：异经织物弹力织物转杯纱双浆槽压浆力

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横条织物的设计与生产

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棉纺织技术 2007年第1期35卷 58-60页

作者：万新义河南省许昌豫中纺织有限公司

为了顺利开发一个梭口中引入两根纬纱形成的横条织物,对产品的技术规格与性能特点进行了分析,并优选原料,优化配置织部工艺。整经工序要合理配置张力盘,浆纱工序要轻张力、小伸长、重加压、高增强、匀卷绕,织造工序要大张力、早开口、... 详细信息

为了顺利开发一个梭口中引入两根纬纱形成的横条织物,对产品的技术规格与性能特点进行了分析,并优选原料,优化配置织部工艺。整经工序要合理配置张力盘,浆纱工序要轻张力、小伸长、重加压、高增强、匀卷绕,织造工序要大张力、早开口、强打纬,并加强挡车工和上轴工的培训,从而使定长成包率达到90%。

关键词：横条织物剑杆织机双纬织物整经浆纱织造整理

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罗伊氏乳杆菌产罗伊氏细菌素的工艺优化

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食品与生物技术学报 2019年第11期38卷 63-69页

作者：万心怡徐学明吴凤凤江南大学食品学院

罗伊氏乳杆菌(Lactobacillus reuteri)是一种安全、高效生产罗伊氏细菌素的菌株。作者优化了罗伊氏乳杆菌ATCC 53608转化甘油生产罗伊氏细菌素的工艺参数。结果表明:处于初期稳定期(26 h)的***,其细胞内甘油脱水酶能达到最大酶活2.2 U/... 详细信息

罗伊氏乳杆菌(Lactobacillus reuteri)是一种安全、高效生产罗伊氏细菌素的菌株。作者优化了罗伊氏乳杆菌ATCC 53608转化甘油生产罗伊氏细菌素的工艺参数。结果表明:处于初期稳定期(26 h)的***,其细胞内甘油脱水酶能达到最大酶活2.2 U/mg,有利于转化甘油生产罗伊氏细菌素。正交实验优化后的最佳生产工艺:甘油浓度400 mmol/L,接种量110 mg/mL,酶转化时间2 h,转化温度30℃,pH 6.2。优化后罗伊氏细菌素的平均产量达到(241.2±3.4)mmol/L。

关键词：罗伊氏乳杆菌罗伊氏细菌素酶转化抑菌剂

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