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Characterization of peroxyacetyl nitrate(PAN)under different PM_(2.5) concentration in wintertime at a North China rural site

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Journal of Environmental Sciences 2022年第4期34卷 221-232页

作者： Zhuoyu Li Guangzhao Xie Hui chen Bixin Zhan lin Wang Yujing Mu Abdelwahid Mellouki jianmin chen Department of Environmental Science&Engineering Fudan Tyndall CenterInstitute of Atmospheric SciencesFudan UniversityShanghai 200438China Center for Excellence in Regional Atmospheric Environment Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China Research Center for Eco-Environmental Sciences Chinese Academy of SciencesBeijing 100085China Institut de Combustion AérothermiqueRéactivitéet EnvironnementCentre National de la Recherche Scientifique45071 Orléans cedex 02France

As a secondary pollutant of photochemical pollution,peroxyacetyl nitrate(PAN)has attracted a close attention.A four-month campaign was conducted at a rural site in North China Plain(NCP)including the measurement of PAN,O_(3),NO_(x),PM_(2.5),oxygenated volatile organic compounds(OVOCs),photolysis rate constants of NO_(2)and O_(3)and meteorological parameters to investigate the wintertime characterization of photochemistry from November 2018 to February *** results showed that the maximum and mean values of PAN were 4.38 and 0.93±0.67 ppbv during the campaign,*** PAN under different PM_(2.5)concentrations from below 75μg/m^(3)up to 250μg/m^(3),showed different diurnal variation and formation *** the PM_(2.5)concentration range of above 250μg/m^(3),PAN had the largest daily mean value of 0.64 ppbv and the fastest production rate of 0.33 ppbv/*** the perspective of PAN’s production mechanism,the light intensity and precursors concentrations under different PM_(2.5)pollution levels indicated that there were sufficient light intensity and high volatile organic compounds(VOCs)and NO_(x)precursors concentration even under severe pollution level to generate a large amount of ***,the bimodal staggering phenomenon of PAN and PM_(2.5)provided a basis that PAN might aggravate haze through secondary organic aerosols(SOA)formation.

关键词： Peroxyacetyl nitrate PM_(2.5) Wintertime North China Rural site

睡眠障碍对慢性阻塞性肺疾病患者不同吸入药物治疗效果的影响

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中国医师杂志 2024年第6期26卷 811-816,822页

作者：孙甜李建民林铃陈平成玮宋庆刘聪曾玉琴湖南省人民医院(湖南师范大学附属第一医院)呼吸与危重症医学科长沙410002 中南大学湘雅二医院呼吸与危重症医学科中南大学呼吸疾病研究所湖南省呼吸与危重症疾病临床医学研究中心中南大学呼吸疾病诊疗中心长沙410011

目的探究睡眠障碍对慢性阻塞性肺疾病(简称慢阻肺)患者不同吸入药物治疗效果的影响。方法选取2020年12月至2021年9月在中南大学湘雅二医院呼吸与危重症医学科门诊就诊的393例稳定期慢阻肺患者进行前瞻性观察性研究。采用匹兹堡睡眠质量... 详细信息

目的探究睡眠障碍对慢性阻塞性肺疾病(简称慢阻肺)患者不同吸入药物治疗效果的影响。方法选取2020年12月至2021年9月在中南大学湘雅二医院呼吸与危重症医学科门诊就诊的393例稳定期慢阻肺患者进行前瞻性观察性研究。采用匹兹堡睡眠质量指数(PSQI)评估患者的睡眠质量,将慢阻肺患者分为非睡眠障碍组和睡眠障碍组。采用柏林问卷评估患者是否存在阻塞性睡眠呼吸暂停综合征(OSAS)风险,医院焦虑抑郁问卷(HADS)评估患者是否存在焦虑、抑郁的状态。评估患者随访半年内的症状改善情况[最小临床改善(MCID)]及症状恶化情况[临床重要恶化(CID)]。并记录随访一年期间患者的中重度急性加重情况。比较两组患者的临床特征,多因素回归分析评估睡眠质量与慢性阻塞性肺疾病预后的关系及睡眠障碍对于不同吸入药物治疗效果的影响。结果393例慢阻肺患者的年龄为(62.9±8.3)岁,第1秒用力呼气容积占预计值百分比(FEV_(1)%)中位数为53.7%(30.7%),PSQI得分(5.7±3.4)分。186例(47.3%)患者存在睡眠障碍。与非睡眠障碍组患者相比,睡眠障碍组患者初中及以下教育程度占比更多,第1秒用力呼气容积(FEV_(1))及FEV_(1)/用力肺活量(FVC)更低,基线慢阻肺评估测试(CAT)、改良版英国医学研究委员会呼吸困难问卷(mMRC)和临床慢阻肺问卷(CCQ)评分更高,且合并焦虑的比例更高(均P<0.05)。与非睡眠障碍组患者相比,睡眠障碍组患者发生MCID的比例更低(P=0.030),发生CID的比例更高(P=0.005)。在随访的1年期间,睡眠障碍组患者发生中重度急性加重(P=0.001)、重度急性加重(P=0.003)以及频繁急性加重(P=0.009)的比例均更高。多因素回归分析结果显示,睡眠障碍组患者发生MCID(OR:0.288,95%CI:0.145~0.379,P<0.001)的可能性更低,且发生CID(OR:3.150,95%CI:2.011~4.388,P<0.001)和急性加重(OR:1.659,95%CI:1.162~2.368,P=0.005)的风险增加。睡眠障碍组患者中,与使用长效抗胆碱药物(LAMA)或吸入性糖皮质激素(ICS)+长效β2受体激动剂(LABA)的患者相比,使用LABA+LAMA的患者发生MCID的可能性均更高(OR:1.420,95%CI:1.021~2.751,P=0.010;OR:1.976,95%CI:1.123~2.227,P=0.023)。结论与非睡眠障碍组患者相比,睡眠障碍的慢阻肺患者发生症状改善的可能性更低,而发生症状恶化以及急性加重的风险更高。睡眠障碍的慢阻肺患者使用LABA+LAMA更容易获得症状改善。

关键词：肺疾病,慢性阻塞性睡眠障碍投药,吸入

Atmospheric gaseous organic acids in winter in a rural site of the North China Plain

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Journal of Environmental Sciences 2022年第3期34卷 190-203页

作者： Xiaoyu Hu Gan Yang Yiliang Liu Yiqun Lu Yuwei Wang Hui chen jianmin chen lin Wang Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention(LAP^(3)) Department of Environmental Science and EngineeringFudan UniversityShanghai 200438China IRDR International Center of Excellence on Risk Interconnectivity and Governance on Weather/Climate Extremes Impact and Public Health Fudan UniversityShanghai 200433China Collaborative Innovation Center of Climate Change Nanjing 210023China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092China

Organic acids are important contributors to the acidity of atmospheric precipitation,but their existence in the Chinese atmosphere is largely *** this study,twelve atmospheric gaseous organic acids,including C_(1)-C_(9) alkanoic acids,methacrylic acid,pyruvic acid,and benzoic acid,were observed in the suburb of Wangdu,Hebei Province,a typical rural site in the northern China plain from 16^(th) December,2018 to 22^(nd) January,2019,using a Vocus■ Proton-Transfer-Reaction time-of-flight mass spectrometer(Vocus PTR-ToF).The quantification of C_(2)-C_(4) alkanoic acids by the Vocus PTR-ToF was calibrated according to the titration of a NaOH solution by C_(2)-C_(4) alkanoic acids from home-made permeation sources,and the other organic acids except for formic acid were quantified based on the k_(cap)-sensitivity linearity in the Vocus PTR-ToF,whereas formic acid was not quantified because our instrument setting led to a significant underestimation in its *** average total concentration of eleven gaseous organic acids was 6.96±5.20 ppbv(parts per billion by volume).The average concentration of acetic acid was the highest(3.86±3.00 ppbv),followed by propanoic acid,butyric acid,and methacrylic *** straw burning was likely the dominant source of the observed gaseous organic acids according to the good correlations between acetonitrile and organic acids and between particulate K+and organic acids,and traffic emissions could also have *** episodes with continuously high concentrations of organic acids,short-distance transport dominated in Wangdu according to the backward trajectory ***,Shijiazhuang,and Hengshui areas were the main source areas based on potential source contribution function and concentration weighing track analysis.

关键词： Gaseous organic acids Vocus PTR-ToF North China plain

Front and Back contact engineering for high-efficient and low-cost hydrothermal derived Sb_(2)(S, Se)_(3) solar cells by using FTO/SnO_(2) and carbon

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Journal of Materials Science & Technology 2020年第23期58卷 130-137页

作者： Liquan Yao Limei lin Hui Liu Fengying Wu jianmin Li Shuiyuan chen Zhigao Huang Guilin chen Fujian Provincial Key Laboratory of Quantum Manipulation and New Energy Materials College of Physics and EnergyFujian Normal UniversityFuzhou350117China Fujian Provincial Engineering Technology Research Center of Solar Energy Conversion and Energy Storage Fuzhou350117China Fujian Provincial Collaborative Innovation Center for Optoelectronic Semiconductors and Efficient Devices Xiamen361005China Department of Physics The Chinese University of Hong KongShatinHong Kong

Antimony chalcogenide Sb_(2)(S, Se)_(3) is attracting a lot of attention as photovoltaic absorber owing to its rewarding photoelectric properties, low toxicity, and earth abundance. However, its device efficiency is still limited by the absorber material quality and device interface recombination. In this work, a fluorinedoped tin oxide(FTO) substrate with ultra-thin SnO_(2) layer and a low-cost stabilized carbon paste are introduced as a front and back contact layer respectively in Sb_(2)(S, Se)_(3) based planar solar cells. Over 5.2% efficiency is demonstrated in the structure of FTO/SnO_(2)/Cd S/Sb_(2)(S, Se)_3/Carbon/Ag, where the Sb_(2)(S, Se)_(3) is prepared by hydrothermal technique. The complementary device physics characterizations reveal that the interfacial recombination between TCO and Cd S is significantly suppressed by the introduction of ultra-thin SnO_(2) layer, which is profited from the leakage protection and bandgap offset engineering by its high resistivity and suitable conduction band minimum. Meanwhile, the successful adoption of the lowcost stabilized carbon as a back contact here shows an enormous potential to replace the conventional organic hole transport materials and noble metal. We hope this work can provide positive guidance to optimize Sb_(2)(S, Se)_(3) based planar solar cells in the future.

关键词： Sb_(2)(S Se)_(3) Contact engineering Recombination Solar cells

缝合横肋式土工织物加筋结构设计及在岩土工程中的应用研究

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造纸科学与技术 2024年第3期43卷 36-39页

作者：陈震林剑敏谌逊龙陈宇源唐海仙福建岩土工程勘察研究院有限公司福建福州350108

土工织物是岩土工程领域常见的纤维织物耗材之一,可对部分岩土工程结构进行加固。基于此,分析了岩土工程领域应用土工织物的基本分类与特征,认为随着材料领域的不断发展,土工织物的综合性能也不断优化,对一种缝合横肋式土工织物的加筋... 详细信息

土工织物是岩土工程领域常见的纤维织物耗材之一,可对部分岩土工程结构进行加固。基于此,分析了岩土工程领域应用土工织物的基本分类与特征,认为随着材料领域的不断发展,土工织物的综合性能也不断优化,对一种缝合横肋式土工织物的加筋结构设计思路进行分析,详细阐述了该类型土工织物在岩土工程领域中的应用效果,认为三层横肋结构相比于单层和双层结构而言能够更高效、更有力地对岩土工程中的土体形成约束。

关键词：缝合横肋式土工织物加筋结构设计岩土工程应用场景

A highly-efficient concentrated perovskite solar cell-thermoelectric generator tandem system

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Journal of Energy Chemistry 2021年第8期30卷 730-735,I0015页

作者： Yangying Zhou yanan chen Qi Zhang Yu Zhou Meiqian Tai Kunihito Koumoto Hong lin State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua University100084 BeijingChina Nagoya Industrial Science Research Institute 464-0819 NagoyaJapan Center of Nanotechnology King Abdulaziz University21589 JeddahSaudi Arabia

Concentrated photovoltaic(CPV)has been identified as an effective method to further enhance the efficiency of photovoltaic *** studies on CPV mainly focused on III-V multi-junction ***,Ⅲ-ⅤCPV technology is mainly used in niche applications due to its high ***,we use metal-halide perovskite solar cell(PSC)to demonstrate a concentrated photovoltaic-thermoelectric tandem *** thermoelectric generator(TEG)is utilized to reduce the effect of heat generation under concentrated solar *** tandem system achieved a peak power conversion efficiency(PCE)of 25.0%at a solar concentration of 3 *** efficiency exceeded that of the single PSC by~4.7%.Our work proves that by controlling the heat flow in concentrated PSC-TEG tandem system,the redundant heat produced by upper PSC can be effectively *** tandem structure provides a promising approach to improve the efficiency and stability of PSC under low-concentrated solar irradiation.

关键词： Concentrated PV-TEG tandem system Perovskite solar cell Thermal behavior Working stability

Hygroscopicity of ambient submicron particles in urban Hangzhou,China

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Frontiers of Environmental Science & Engineering 2011年第3期5卷 342-347页

作者： Jiachen ZHANG lin WANG jianmin chen Shengmao FENG Jiandong SHEN Li JIAO Department of Environmental Science&Engineering Fudan UniversityShanghai 200433China Research Institute for the Changing Global Environment Fudan UniversityShanghai 200433China Central Station of Environmental Monitoring Hangzhou Environmental Protection BureauHangzhou 310012China

In this study,hygroscopicity of size-segregated ambient submicron particles in urban Hangzhou was studied from 28th December 2009 to 18th January 2010,using a hygroscopicity-tandem differential mobility analyzer(H-TDMA).The submicron particles in Hangzhou showed a minor hygroscopic growth at 73%relative humidity(RH),and then grew significantly between 77%and 82%*** distribution accounted for 90%for 30 nm particles,17%for 50 nm particles,and less than 7%for particles larger than 50 nm at 82%*** of the bimodal distribution indicated a less hygroscopic group and a more hygroscopic group,with the fraction of the more hygroscopic group increasing with the initial dry particle size and then remaining almost constant for accumulation mode *** results imply that submicron particles in urban Hangzhou were almost entirely externally mixed,and the hygroscopic properties of ambient particles in urban Hangzhou were mainly a function of their size and chemical composition.

关键词： hygroscopicity hygroscopic tandem differential mobility analyzer(H-TDMA) submicron ambient particles Hangzhou

The facile preparation of p-(methoxy)calix[n]arenes(n=6,7,or 8)and their permethylated derivatives

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Chinese Chemical Letters 2021年第11期32卷 3539-3543页

作者： Yihan Ding jianmin Jiao Baobao Sun Zhen Yang chen lin Leyong Wang Key Laboratory of Mesoscopic Chemistry of MOE Jiangsu Key Laboratory of Advanced Organic MaterialsSchool of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China School of Petrochemical Engineering Changzhou UniversityChangzhou 213164China

The mixture of p-(methoxy)calix[n]arenes(n=6,7 or 8)was prepared in one step from p-methoxyphenol under basic conditions,and their fully methylated derivatives p-(dimethyloxy)calix[n]arenes(n=6,7 or 8)were also prepared and purified by column chromatography to indentify their *** this process,the single crystal of p-(dimethyloxy)calix[7]arene was obtained and its structure was *** proportion of p-(methoxy)calix[6]-,[7]-and[8]-arenes in the mixture obtained from the reaction was investigated under different reaction conditions,and p-(methoxy)calix[6]-and[8]-arenes could be separated from the mixture by solvent *** addition,the host-guest interaction of p-(dimethyloxy)calix[6]arene with methyl-4,4′-bipyridinium hexafluorophosphate in organic solvents was investigated.

关键词： Calixarene One-pot synthesis Solvent extraction Single crystal Host-guest interaction

Mechanical Characterization of Close Cell Aluminum Foams Reinforced by High Voltages Electro-deposition

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Journal of Wuhan University of Technology(Materials Science) 2019年第3期34卷 541-548页

作者： XU Yiku YANG Lei SONG Xuding chen Yongnan PENG Xuan chen Yunzhou HAO jianmin LIU lin School of Material Science and Engineering Chang'an UniversityXi'an710064China Key Laboratory of Road Construction Technology and Equipment MOEChang'an UniversityXi'an710064China State Key Laboratory of Solidification and Processing Northwestern Polytechnical UniversityXi'an 710072China

The parameters for the electro-deposition of Cu were optimized in order to increase the compressive properties of close cell aluminum. Different values of deposition voltages and times were considered to vary the amount of deposited Cu. The surface morphology of the coating was observed by SEM and the compressive properties were evaluated by MTS. The results show that the coating is more homogeneous and compact with increasing voltage in a certain range, and beyond which, the coating quality decreases apparently. The reason is dedicated to the discharge rate of Cu2+ and nucleus formed in unit time. The compression results show three experienced stages: elastic deformation stage, collapse deformation stage and densification stage. After the electro-deposition of Cu, the elasticity modulus is increased obviously and the platform stress is also increased. Under the same strain, the stress of the aluminum foam with coating is reinforced comparing with the aluminum foam without coating. Furthermore, the platform area is widened apparently. In addition, Cu-SiC nanocomposite coatings are electrodeposited in alumium foams for further improving the mechanical characterization.

关键词： aluminum foam electro-deposition mechanical characterization