检索结果-南通市图书馆

Exploring the HONO source during the COVID-19 pandemic in a megacity in China

Journal of Environmental Sciences 2025年第3期149卷 616-627页

作者： Mingkai Wang Shenbo Wang Ruiqin Zhang Minghao Yuan yifei xu Luqi Shang Xinshuai Song Xinyuan Zhang Yunxiang Zhang School of Ecology and Environment Zhengzhou UniversityZhengzhou 450000China Research Institute of Environmental Sciences Zhengzhou UniversityZhengzhou 450000China Zhengzhou Ecological Environment Monitoring Center of Henan Province Zhengzhou 450000China College of Chemistry Zhengzhou UniversityZhengzhou 450000China

HONO is a critical precursor of•OH,but its sources are controversial due to its complex formation *** study conducted comprehensive observations in Zhengzhou from April 26 to May 11,*** NO_(x)concentrations were observed during the Covid epidemic period(EP)(10.4±3.0 ppb),compared to the pre-epidemic period(PEP)(12.5±3.8 ppb).The mean HONO concentration during EP(0.53±0.34 ppb)was 0.09 ppb lower than that during PEP(0.62±0.53 ppb).The decrease in HONO concentration during EP came mainly at night due to the reduction in the direct emission(P_(emi))(0.03 ppb/hr),the homogeneous reaction between•OHandNO(P_(OH+NO))(0.02 ppb/hr),and the heterogeneous conversion of NO_(2)on the ground(0.01 ppb/hr).Notably,there was no significant change in daytime HONO *** daytime HONO budget indicated that the primary HONO sources during PEP were the nitrate photolysis(P_(nitrate)),followed by the P_(OH+NO),Pemi,the photo-enhanced reaction of NO_(2)on the ground(P_(ground+hv))and aerosol surface(Paerosol+hv).The primary HONO sources were Pnitrate,POH+NO,P_(emi),and_(Paerosol+hv)during EP,*** missing source has a high correlation with solar radiation,there might be other photo-related HONO sources or the contributions of photosensitized reactions were *** the extremely underestimated cases,HONO production rates fromthe P_(nitrate),P_(ground+hv),and Paerosol+hv increased by 0.17,0.10,and 0.10 ppb/hr during PEP,0.23,0.13,and 0.16 ppb/hr during EP,and P_(nitrate)was still the primary source during both PEP and EP.

关键词： Nitrous acid Nitrogen oxides COVID-19 HONO budget Unknown sources

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Smartly tuning supramolecular chirality in polymer gels via photoexcitation-induced cooperative self-assembly

引用

Science China Chemistry 2025年第03期 1126-1135页

作者： Bingbing Yue Yulong Shi Fan Yang Danfeng Ye Jian Jin Pilan Zhang Shen Song yifei xu Hui Lin Shihui Zhu Liangliang Zhu School of Materials and Chemistry University of Shanghai for Science and Technology State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular ScienceFudan University College of Material Science and Chemical Engineering Ningbo University of Technology Shanghai Depeac Biotechnology Co. Ltd. Burn and Plastic Surgery Department Children's Medical Center Affiliated to Shanghai Jiao Tong University School of Medicine

Although supramolecular chirality tuning is prosperous in systems with small molecular building blocks,these systems lack structural strength and have limited practical ***,polymer systems do not exhibit these drawbacks but suffer from topological chain entanglement,which often leads to large dynamic obstacles and therefore limits the tunability of supramolecular ***,we report that by manipulating stoichiometry and employing light to alter the H-bond crosslinking between a photoexcitation-induced aggregatable molecule and high molecular weight poly(L-lactic acids),supramolecular chirality tuning of the polymer gel systems can be achieved in different ways through a cooperative ***,the Cotton effects of the examined systems can be negatively tuned by varying their stoichiometry,while positive tuning can be realized by *** deexcitation,negative Cotton effect tuning occurs again spontaneously in some *** supramolecular chirality tuning is accompanied by rheological property tuning,demonstrating that our strategy can overcome polymer chain entanglement *** proposed strategy inspires further works on the precise control of polymer chirality and,hence,development of asymmetric materials with changeable optical activity and modulus.

关键词：

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Enhancing the high-temperature stability of OFETs by inducing D-A stacking in P(NDI2OD-T2) films

引用

Science China Materials 2025年第1期68卷 117-124页

作者： xuetao Xiao Wenhao Li Qing Zhou Zeng Wu Xiaochan Zuo Rong Ma yifei xu Sichun Wang Yan Zhao Laboratory of Molecular Materials and Devices Department of Materials ScienceFudan UniversityShanghai 200433China State Key Laboratory of Molecular Engineering of Polymers and Department of Macromolecular Science Fudan UniversityShanghai 200433China

High-temperature stability of organic field-effect transistors(OFETs)is critical to ensure its long-term reliable operation under various environmental *** molecular packing of donor-acceptor(D-A)conjugated polymers is closely related to the electrical performance stability in ***,we choose poly[[N,N′-bis(2-octyldodecyl)-naphthalene-1,4,5,8-bis(dicarboximide)-2,6-diyl]-alt-5,5′-(2,2′-bithiophene)]as a modal system to reveal the relationship between the molecular stacking and electrical stability in high-temperature *** results demonstrate that the films with D-A moieties in alternate stacking have better electrical thermal stability compared to normal donor-donor(D-D)*** D-A stacking configuration alternates donor and acceptor units along the out-of-plane direction,while the D-D stacking involves D-D and A-A stacking *** structural transition from D-D to D-A is captured at a treated temperature range of 225±250°*** to the tighter packing arrangement along theπ-πand lamellar directions,the electron mobility of the D-A stacked films reaches up to 0.23 cm^(2)/V·s,a 50%increase as compared to the D-D stacking ***,the D-A stacked films indicate superior electrical performance stability with mobility retaining 100%at 250°C during high-temperature cycling *** result highlights that the manipulation of conjugated polymer closely stacked structures can significantly enhance the thermal stability and durability of semiconductor devices.

关键词： high-temperature stability D-A stacking P(NDI2OD-T2) electrical properties OFETs

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

生物基导电水凝胶及其在柔性电子器件的应用

引用

复合材料学报 2025年第1期42卷 104-118页

作者：董昊范雨薪张旭韦会鸽徐一飞曾威天津科技大学化工与材料学院天津科技大学生物源纤维制造技术国家重点实验室天津市贰拾壹站检测技术有限公司

生物基导电水凝胶是将生物质材料和导电介质引入水凝胶中制备而成的导电材料，因其具有良好的生物相容性和亲肤性等优势，被广泛应用在柔性电子器件领域。本综述按照生物基体类别，分别介绍蛋白质基、多糖基、核酸基3类常见的生物基导... 详细信息

生物基导电水凝胶是将生物质材料和导电介质引入水凝胶中制备而成的导电材料，因其具有良好的生物相容性和亲肤性等优势，被广泛应用在柔性电子器件领域。本综述按照生物基体类别，分别介绍蛋白质基、多糖基、核酸基3类常见的生物基导电水凝胶，分析了不同生物基材料的导电机制以及各自特有的功能，并介绍了生物基导电水凝胶在柔性传感器、柔性电化学储能器件、摩擦纳米发电机、仿生柔性电子设备等柔性电子器件中的应用，最后对生物基导电水凝胶的发展趋势进行了总结与展望。

关键词：生物基材料导电水凝胶柔性传感器柔性电化学储能器件摩擦纳米发电机仿生柔性电子设备

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

微/纳结构Cr_(3)C_(2)-NiCr陶瓷涂层在3.5%NaCl溶液中的腐蚀磨损行为

引用

表面技术 2025年第1期54卷 150-160页

作者：南鹏娟贾均红焦小雨张宗宇徐艺飞张庆庆陕西科技大学西安710021

目的设计并制备微/纳结构Cr_(3)C_(2)-NiCr陶瓷涂层,以改善机械部件的耐腐蚀磨损性能。方法采用行星式球磨机结合喷雾造粒仪制备了微/纳结构Cr_(3)C_(2)粉体,造粒得到的Cr_(3)C_(2)粉体与NiCr粉混合均匀后通过等离子喷涂技术,在316L不... 详细信息

目的设计并制备微/纳结构Cr_(3)C_(2)-NiCr陶瓷涂层,以改善机械部件的耐腐蚀磨损性能。方法采用行星式球磨机结合喷雾造粒仪制备了微/纳结构Cr_(3)C_(2)粉体,造粒得到的Cr_(3)C_(2)粉体与NiCr粉混合均匀后通过等离子喷涂技术,在316L不锈钢基体上制备了微/纳结构Cr_(3)C_(2)-NiCr复合涂层。利用球-盘式往复摩擦磨损试验机结合电化学工作站,研究了3.5%NaCl水溶液中复合涂层的腐蚀磨损性能。利用扫描电镜观察了复合粉体、复合涂层和复合涂层腐蚀磨损后的微观形貌,利用X射线衍射仪分析了复合粉体和复合涂层的相变。结果复合粉体表面大小颗粒随机分布,表面结构致密。4种复合涂层显微结构致密,未见明显孔隙及裂纹生成。WNC3(纳米Cr_(3)C_(2)含量)复合涂层的孔隙率低至0.7%,显微硬度为853.26HV0.3。WNC3涂层所遭受的腐蚀程度最小。复合涂层动态下的自腐蚀电流密度相较于静态下有所升高,磨损和腐蚀的共同作用导致滑动接触下涂层的腐蚀速率大于静态下的涂层腐蚀速率。WNC3复合涂层的平均摩擦因数(约0.20)和磨损率(约9.7×10^(‒7)mm^(3)/(N·m))均最低。在摩擦过程中,磨损痕迹内部的腐蚀电流密度较高,腐蚀溶液通过涂层的缺陷不断向涂层内部扩散,导致局部剥落面积扩大。结论添加50%纳米Cr_(3)C_(2)晶粒使涂层内部更加致密,涂层孔隙率降低,显微硬度增加,在3.5%NaCl水溶液中表现出优异的耐腐蚀磨损性能。复合涂层在3.5%NaCl水溶液中腐蚀磨损时,腐蚀会降低复合涂层的机械性能,增加复合涂层的磨损;而磨损会导致复合涂层暴露出更多的缺陷,进而增加腐蚀发生的可能。

关键词：微/纳结构复合涂层 Cr_(3)C_(2)-NiCr陶瓷涂层等离子喷涂腐蚀磨损

来源：

维普期刊数据库

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Oxidation of amorphous alloys

引用

Journal of Materials Science & Technology 2018年第11期34卷 1977-2005页

作者： Zhiqiang xu yifei xu An Zhang Jiangyong Wang Zumin Wang School of Materials Science and Engineering Tianjin University Department of Physics Shantou University

Owing to their unique short-or medium-range ordered microstructures and excellent mechanical, physical, and chemical properties, amorphous alloys have attracted significant interest in recent years. For the application of amorphous alloys, clarifying their oxidation processes and mechanisms is necessary since many of the surface-related properties of amorphous alloys largely depend on the surface oxide *** aim of this paper is to review the recent research on the thermal oxidation behaviors of amorphous alloys under pure oxygen or air condition. The contents are divided into three categories according to the number of components the research considers, i.e., the oxidation of binary, ternary, and multi-component（〉3） amorphous alloys. Each section discusses the thermal stability of the amorphous matrix, oxidation kinetics, and the oxide layer and amorphous substrate, which are strongly affected by internal factors（i.e., alloy elements and microstructure） and external factors（i.e., oxidation temperature, duration, and oxygen partial pressure, etc.）. The general features of the oxidation of amorphous alloys – from simple binary to complex multi-component amorphous alloys – will be summarized. This overview of the current scientific understanding on the fundamentals of these materials may provide guidelines for the development of strongly corrosion-resistant amorphous alloys.

关键词： Amorphous alloys Oxidation Oxidation kinetics Microstructure Surface treatment

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

基于节点参与度的低压有源配电网故障定位监测装置优化配置方法

引用

电测与仪表 2025年第1期62卷 124-132页

作者：陈韶昱冯洋郑志祥徐益飞崔健勇乐健国网浙江省电力有限公司衢州供电公司浙江衢州324000 武汉大学电气与自动化学院武汉430072

低压配电网馈线区段短且分支多,现场情况复杂难以准确进行故障定位,出于对设备投资的考量,无法在每个节点安装故障监测装置,开展低压配电网故障监测装置优化配置方法的研究具有现实意义。文中利用安装在线路分段开关或联络开关处的故障... 详细信息

低压配电网馈线区段短且分支多,现场情况复杂难以准确进行故障定位,出于对设备投资的考量,无法在每个节点安装故障监测装置,开展低压配电网故障监测装置优化配置方法的研究具有现实意义。文中利用安装在线路分段开关或联络开关处的故障监测装置监测故障电流信息,将边缘计算技术应用于故障定位系统。统计各个馈线区段发生故障时各馈线首端节点的参与频次,依次计算节点参与度。设计综合考虑整体故障监测单元的参与度和监测装置配置均匀程度的优化模型目标函数,考虑经济性约束条件。通过多个算例验证了文中所提出的优化配置方法的正确性和有效性。文中方法可有效确保低压有源配电网故障定位的准确性,提高低压配电网运行的可靠性与经济性。

关键词：低压配电网边缘计算故障区段定位节点参与度监测装置优化配置

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Experiments and model for the surface tension of carbonated monoethanolamine aqueous solutions

引用

Science China Chemistry 2012年第7期55卷 1467-1473页

作者： FU Dong xu yifei WANG LanFen CHEN LiHong School of Environmental Science and Engineering North China Electric Power UniversityBaoding 071003China

The surface tension of carbonated monoethanolamine aqueous solutions from 293.15 to 323.15 K was measured by using an automatic surface tension-meter.A model applicable for the surface tension of MEA-CO2-water mixtures was proposed and the calculated results agreed well with the *** influences of temperature,MEA concentration and CO2 loading were demonstrated on the basis of experiments and calculations.

关键词： MEA aqueous solution CO2 loading surface tension

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Metal-organic layers induce in situ nano-structuring of Cu surface in electrocatalytic CO_(2)reduction

引用

Nano Research 2023年第4期16卷 4554-4561页

作者： Xinru He Jiawei Chen yifei xu Yan Shen Yifan Zeng Jieyu Zhu Bingjun xu Cheng Wang iChem State Key Laboratory of Physical Chemistry of Solid SurfacesCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China College of Chemistry and Molecular Engineering Peking UniversityBeijing 100871China

Cu-based catalysts have attracted widespread attention for its capability in electrocatalytically reducing CO_(2)to a variety of *** modification of Cu has become an interesting method for tuning the catalytic ***,we use Zrbased metal-organic layers(MOLs)as the additive of the Cu surface,which enhanced the Faradaic efficiency of CH4 by two times as compared to the untreated polycrystalline Cu ***,the MOLs were found to induce in situ nano-structuring of the Cu foil surface within seconds in the electrolysis,as revealed by a combination of scanning electron microscopy(SEM),grazing incidence X-ray diffractometry(GIXRD),and linear sweep voltammetry(LSV)*** surface changes are responsible for the shift of product *** experiments suggest that negatively chargedμ3-O−on the Zr-cluster in the MOL might interact with CO-covered Cu surface and induce roughing and *** work reveals a potential role of additive on Cu to induce surface nano-structuring that tunes catalytic activity and selectivity.

关键词： CO_(2)reduction CO_(2)methanation metal-organic layers Cu foil surface nano-structuring

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Sustained‑Release Nanocapsules Enable Long‑Lasting Stabilization of Li Anode for Practical Li‑Metal Batteries

引用

Nano-Micro Letters 2020年第12期12卷 239-250页

作者： Qianqian Liu yifei xu Jianghao Wang Bo Zhao Zijian Li Hao Bin Wu School of Materials Science and Engineering Zhejiang UniversityHangzhou 310027People’s Republic of China

A robust solid-electrolyte interphase(SEI)enabled by electrolyte additive is a promising approach to stabilize Li anode and improve Li cycling ***,the self-sacrificial nature of SEI forming additives limits their capability to stabilize Li anode for long-term ***,we demonstrate nanocapsules made from metal–organic frameworks for sustained release of LiNO3 as surface passivation additive in commercial carbonate-based *** nanocapsules can offer over 10 times more LiNO3 than the solubility of *** supply of LiNO3 by nanocapsules forms a nitride-rich SEI layer on Li anode and persistently remedies SEI during prolonged *** a result,lifespan of thin Li anode in 50μm,which experiences drastic volume change and repeated SEI formation during cycling,has been notably *** pairing with an industry-level thick LiCoO2 cathode,practical Li-metal full cell demonstrates a remarkable capacity retention of 90%after 240 cycles,in contrast to fast capacity drop after 60 cycles in LiNO3 saturated electrolyte.

关键词： Metal–organic frameworks LiNO3 Nanocapsules Lithium-metal anode Lithium-metal batteries

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：