检索结果-南通市图书馆

Seasonal variation in surface ozone and its regional characteristics at global atmosphere watch stations in China

Journal of Environmental Sciences 2019年第3期31卷 291-302页

作者： Ningwei Liu Weili Lin jianzhong ma Wanyun Xu Xiaobin Xu Nanjing University of Information Science & Technology State Key Laboratory of Severe Weather & Cma Key Laboratory for Atmospheric Chemistry Chinese Academy of Meteorological Sciences Shenyang Institute of Atmospheric Environment China Meteorological Administration College of Life & Environmental Science Minzu University of China

We investigated the seasonal and spatial ozone variations in China by using three-year surface ozone observation data from the six Chinese Global Atmosphere Watch(GAW)stations and tropospheric column ozone data from satellite retrieval over the period2010–2012. It is shown that the seasonal ozone variations at these GAW stations are rather different, particularly between the western and eastern locations. Compared with western China, eastern China has lower background ozone levels. However, the Asian summer monsoon(ASM) can transport photochemical pollutants from the southern to the northern areas in eastern China, leading to a northward gradual enhancement of background ozone levels at the eastern GAW stations. Over China, the tropospheric column ozone densities peak during spring and summer in the areas that are directly and/or indirectly affected by the ASM, and the peak time lags from the south to the north in eastern China. We also investigated the regional representativeness of seasonal variations of ozone at the six Chinese GAW stations using the yearly maximum tropospheric column month as *** results show that the seasonal variation characteristics of ozone revealed by the Chinese GAW stations are typical, with each station having a considerable large surrounding area with the ozone maximum occurring at the same month. Ozone variations at the GAW stations are influenced by many complex factors and their regional representativeness needs to be investigated further in a broader sense.

关键词： Surface ozone Tropospheric ozone column GAW stations Seasonal variations Regional representativeness

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

氨基化改性胶原蛋白的研究进展

引用

精细化工 2024年第2期41卷 341-347页

作者：姚函马建中沈一鸣范倩倩张文博丁国荣陕西科技大学轻工科学与工程学院陕西西安710021 陕西科技大学化学与化工学院陕西西安710021 陕西科技大学轻化工程国家级实验教学示范中心陕西西安710021 陕西科技大学陕西省轻化工助剂化学与技术协同创新中心陕西西安710021 浙江新金鑫皮业有限公司浙江嘉兴314000

胶原蛋白是生物体内重要的组织蛋白,来源广泛,种类繁多,具有良好的生物相容性、可生物降解性以及生物活性等,是一种重要的功能性材料。然而未改性的胶原蛋白理化性质较差,如热稳定性、机械强度及耐酶性等,限制了胶原蛋白的应用范围。因... 详细信息

胶原蛋白是生物体内重要的组织蛋白,来源广泛,种类繁多,具有良好的生物相容性、可生物降解性以及生物活性等,是一种重要的功能性材料。然而未改性的胶原蛋白理化性质较差,如热稳定性、机械强度及耐酶性等,限制了胶原蛋白的应用范围。因此,如何改性胶原蛋白,从而提高其理化性质一直是研究者们关注的热点。氨基作为胶原蛋白侧链上的主要活性基团之一,是胶原蛋白表面正电荷的主要来源,在与其他物质的交联中发挥不可或缺的作用。因此,氨基化改性胶原蛋白可以增加胶原蛋白上的活性位点,提高其表面电荷,有利于拓宽其应用范围。在此背景下,该文主要介绍了胶原蛋白的理化性质和主要的改性方法,综述了氨基化胶原蛋白在生物医学、环境治理及皮革工业等方面的最新研究进展,并对未来氨基化胶原蛋白在皮革清洁无铬鞣制系统中的应用前景进行了展望。

关键词：胶原蛋白表面电荷氨基化皮革生物医学

来源：

维普期刊数据库博看期刊

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

甘肃省:精心组织主动谋划有效发挥基层抗旱坚实力量

引用

中国防汛抗旱 2024年第3期34卷 85-86页

作者：郑德兵马晓霞麻智斌马建忠甘肃省水利厅天水市张家川县水务局

2023年,甘肃省旱情两度起伏。6月中旬后,全省气温偏高,35℃以上平均高温日数创历史纪录;降水偏少,河流来水锐减,各主要河流来水量较多年同期枯4成,其中旱情最为严重的石羊河流域枯8成,部分河流断流;河西地区31座重点水库蓄水量较近5年... 详细信息

2023年,甘肃省旱情两度起伏。6月中旬后,全省气温偏高,35℃以上平均高温日数创历史纪录;降水偏少,河流来水锐减,各主要河流来水量较多年同期枯4成,其中旱情最为严重的石羊河流域枯8成,部分河流断流;河西地区31座重点水库蓄水量较近5年均值偏少59%,金川峡、皇城、西大河等水库处于死水位以下,李桥、瓷窑口、黄羊、东湾湖等水库干涸见底。7月、8月多地未发生有效降雨,部分县(区)降水偏少9成,气象干旱达到重旱级别,河西大部、中部及南部局地发生严重旱情并持续发展,人畜饮水和农业灌溉受到影响。面对严峻旱情,甘肃省水利厅把抗旱保供水作为最大的政治任务,充分挖潜行业职能,科学调度、精准施策,地方各级政府及水务部门坚决服从省级抗旱工作调度,扛牢责任,服务大局,坚守抗旱工作一线,全力以赴做好抗旱减灾各项工作。

关键词：水库蓄水量有效降雨人畜饮水精准施策高温日数抗旱工作河流断流科学调度

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

All-inorganic TiO_(2)/Cs_(2)AgBiBr_(6) composite as highly efficient photocatalyst under visible light irradiation

引用

Frontiers of Chemical Science and Engineering 2023年第12期17卷 1925-1936页

作者： jianzhong ma Lu Wen Qianqian Fan Siying Wei Xueyun Hu Fan Yang College of Bioresources Chemical and materials Engineering Shaanxi University of Science and TechnologyXi’an 710021China College of Chemistry and Chemical Engineering Shaanxi University of Science and TechnologyXi’an 710021China Key Laboratory of Auxiliary Chemistry and Technology for Chemical Industry(Ministry of Education) Shaanxi University of Science and TechnologyXi’an 710021China Xi’an Key Laboratory of Green Chemicals and Functional materials Shaanxi University of Science and TechnologyXi’an 710021China College of Environmental Science and Engineering Shaanxi University of Science and TechnologyXi’an 710021China

In recent years, limited photocatalysis efficiency and wide band gap have hindered the application of TiO_(2) in the field of photocatalysis. A leading star in photocatalysis has been revealed as lead-free Cs_(2)AgBiBr_(6) double halide perovskite nanocrystals, owing to its strong visible light absorption and tunable band gap. In this work, this photocatalytic process was facilitated by a unique TiO_(2)/Cs_(2)AgBiBr_(6) composite, which was identified as an S-cheme heterojunction. TiO_(2)/Cs_(2)AgBiBr_(6) composite was investigated for its structure and photocatalytic behavior. The results showed that when the perovskite dosage is 40%, the photocatalytic rate of TiO_(2) could be boosted to 0.1369 min^(-1). This paper discusses and proposes the band gap matching, carrier separation, and photocatalytic mechanism of TiO_(2)/Cs_(2)AgBiBr_(6) composites, which will facilitate the generation of new ideas for improving TiO_(2)’s photocatalytic performance.

关键词： Cs_(2)AgBiBr_(6)nanocrystals visible-light photocatalyst Cs_(2)AgBiBr_(6) TiO_(2)heterojunction

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

High performance strain sensor based on leather activated by micro-cracking conductive layer

引用

Collagen and Leather 2023年第4期5卷 76-87页

作者： jianzhong ma Zhijie Cheng Sha Tan Tian Zheng Yan Zong College of Bioresources Chemical and materials Engineering Shaanxi University of Science and TechnologyXi'an 710021China Xi'an Key Laboratory of Green Chemicals and Functional materials Xi'an 710021China materials Characterization and Fabrication Platform Department of Chemical EngineeringUniversity of MelbourneParkvilleMelbourne 3010Australia

Flexible strain sensors are capable to detect external force induced strain change owing to their unique ability to convert deformation into electrical ***,micro/nano patterning of conductive layer in strain sensor is an effective method to improve its sensitivity,however the sophisticated manipulation process is limited only in laboratory *** this report,a simple and scalable fabrication strategy was used to create micro-cracking conductive layer as an alternative patterning method to achieve high performance of strain *** details,the sensor was fabricated using leather as the substrate to filtrated acidified multi-walled carbon nanotubes(a-MWCNTs)/layered double hydroxides(LDHs)*** stretching process,micro-cracking structure emerged on the percolated a-MWCNTs/LDHs layer,causing a rise up of resistance according to increasing strain and generated a detectable electrical *** prepared sensor had a large detecting range(60%),high sensitivity(GF of 7238.92 at strain 30-60%),fast response(tensile response time of 270 ms),good stability and *** sensor also inherited the advantages of leather,such as biodegradability and good air permeability,and the introduction of a-MWCNTs/LDHs further enhanced its fire retardancy *** features ensured the sensor as an eco-friendly,comfortable and safe electronic device for human motion detection.

关键词： a-MWCNTs LDHs Leather Flexible strain sensor

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

Close-loop recyclable and flexible halide perovskite@wool keratin sensor with piezoelectric property

引用

Journal of Energy Chemistry 2023年第9期84卷 428-435页

作者： Yingying Zhou Dangge Gao Bin Lyu Chi Zheng Litao Tang Shihao Guo jianzhong ma College of Bioresources Chemical and materials Engineering Shaanxi University of Science and TechnologyXi'an 710021ShaanxiChina Xi'an Polytechnic University Xi'an 710048ShaanxiChina National Demonstration Center for Experimental Light Chemistry Engineering Education(Shaanxi University of Science&Technology) Xi'an 710021ShaanxiChina Xi'an Key Laboratory of Green Chemicals and Functional materials Xi'an 710021ShaanxiChina

Halide perovskites with excellent piezoelectric properties,but their poor stability hinders their largescale ***,a sandwich-structured halide perovskite flexible sensor with good stability was developed according to a three-step procedure as follows:(ⅰ) in-situ growth of wool keratinCsPbBr_(3)(WK-CsPbBr_(3)) using wool keratin in interfacial passivation and coating,(ⅱ) electrospinning of a wool keratin-CsPbBr_(3)/polyacrylonitrile(WCP) nanofiber film,and(ⅲ) coating of the WCP nanofiber with polydimethylsiloxane(PDMS) to obtain a sensor(WCPP).The sensor could generate a piezoelectric voltage of 7.8 V at a pressure of 6 kPa in the stages of pressing and releasing,and the output characteristics did not decline even after 10,000 *** to the 4-month stability of the perovskite sensor,WCPP sensor exhibited the output performance even after 16 months,which indicated that wool keratin as a multidentate improved the stability of the halide ***,the sensor displayed a self-cleaning property and could also light up 14 commercial *** close-loop recycling of the lead halide perovskite was achieved by dissolving the WCP nanofiber film in DMF and then ***,the method proposed is a step forward for achieving the commercialization of WK-CsPbBr_(3) and providing new avenues for further utilization of wool waste.

关键词： Piezoelectric Halide perovskite Wool keratin Sensor Human monitoring

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

Tropospheric NO_2 vertical column densities retrieved from ground-based maX-DOAS measurements at Shangdianzi regional atmospheric background station in China

引用

环境科学学报：英文版 2019年第6期31卷 186-196页

作者： Siyang Cheng jianzhong ma Weiping Cheng Peng Yan Huaigang Zhou Liyan Zhou Peng Yang State Key Laboratory of Severe Weather & Cma Key Laboratory of Atmospheric Chemistry Chinese Academy of Meteorological Sciences China Waterborne Transport Research Institute Cma Meteorological Observation Centre Shangdianzi Regional Air Background Station Beijing Meteorological Bureau Meteorological Bureau of Shijiazhuang

Ground-basedMulti-AXis Differential Optical Absorption Spectroscopy(maX-DOAS)measurements were performed at Shangdianzi(SDZ)regional atmospheric background station in northern China from march 2009 to February *** tropospheric NO_2vertical column densities(VCDs)were retrieved to investigate the background condition of the Beijing–Tianjin–Hebei developed economic circle in *** seasonal variation of mean NO_2tropospheric VCDs(VCD_(Trop))at SDZ is apparent,with the maximum(1.3×10^(16)molec/cm^2)in February and the minimum(3.5×10^(15)molec/cm^2)in August,much lower than those observed at the Beijing city *** average daytime diurnal variations of NO_2VCD_(Trop )are rather consistent for all four seasons,presenting the minimum at noon and the higher values in the morning and *** largest and lowest amplitudes of NO_2VCD_(Trop)diurnal variation appear in winter and in summer,*** diurnal pattern at SDZ station is similar to those at other less polluted stations,but distinct from the ones at the urban or polluted *** NO_2VCDs at SDZ are strongly dependent on the wind,with the higher values being associated with the pollution plumes from Beijing *** NO_2VCDs derived from ground-based maX-DOAS at SDZ show to be well correlated with corresponding OMI(Ozone Monitoring Instrument)satellite products with a correlation coefficient R=***,the OMI observations are on average higher than maX-DOAS NO_2VCDs by a factor of 28%,probably due to the OMI grid cell partly covering the south of SDZ which is influenced more by the pollution plumes from the urban areas.

关键词： Ground-basedmaX-DOAS Tropospheric NO2 Satellite validation Pollution plume Regional atmospheric background station

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

Influence of multi-chemical-component aerosols on the microphysics of warm clouds in North China

引用

Science China Earth Sciences 2011年第3期54卷 451-461页

作者： YANG SuYing ma jianzhong HU ZhiJin YAN Peng CHEN Yue WANG Wei Laboratory for Atmospheric Physics and Environment Nanjing University of Information Science and Technology Nanjing 210044 China Chinese Academy of Meteorological Sciences Beijing 100081 China Chinese Research Academy of Environmental Sciences Beijing 100012 China

An adiabatic bin-sized cloud parcel model is developed by incorporating the multi-chemical-component (MCC) aerosol effects into the UWyo single-chemical-component (SCC) parcel model. The effects of MCC aerosols on the warm cloud microphysics in North China are investigated with the model. The simulations are initialized using the data on chemical components and number size distribution of aerosols measured during the IPAC (Influence of Pollution on Aerosols and Cloud Microphysics in North China) campaign in spring 2006. It is found that the MCC aerosols in North China increase the cloud droplet number concentration (CDNC) and decrease the effective radius more efficiently than pure ammonium-sulfate aerosols. It is also shown that the MCC aerosols in North China can narrow the cloud droplet spectra (CDS) by increasing CDNC in small size and decreasing CDNC in large size. Our results indicate that aerosol chemical components and their size distributions can influence the microphysics of warm clouds, and thus affect atmospheric radiation and precipitation. This should attract more attentions in weather and climate change research in the future.

关键词： aerosols chemical component CCN cloud microphysics cloud model

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

2017—2022年天水市国家级某哨点医院流感监测结果分析

引用

中国初级卫生保健 2024年第2期38卷 70-72页

作者：张新燕马建中闫春娟天水市第一人民医院甘肃天水741000

目的:分析2017—2022年天水市流感流行特征,为天水市制定流感防控措施提供科学依据。方法:收集“中国流感监测信息系统”中2017—2022年天水市某哨点医院流感病例及病原学监测数据,采用描述性流行病学方法进行统计分析。结果:2017—202... 详细信息

目的:分析2017—2022年天水市流感流行特征,为天水市制定流感防控措施提供科学依据。方法:收集“中国流感监测信息系统”中2017—2022年天水市某哨点医院流感病例及病原学监测数据,采用描述性流行病学方法进行统计分析。结果:2017—2022年共收集流感病例24479例,发病率为1.81%;各年份流感病例发病高峰整体集中在1月和12月;流感病例以0~4岁组人群占比最高(56.12%)。共采集4240份流感标本,阳性检出率为8.14%,2020—2022年阳性检出率均低于2017—2019年。各年份优势毒株呈交替流行,不同年龄组阳性检出率差异有统计学意义(χ^(2)=32.904,P<0.05)。结论:天水市流感高峰主要出现在冬春季,夏秋季出现小高峰流行。天水市近两年流感以乙型Victoria毒株流行较多,应对其予以重点关注,并且应加强15岁以下人群的流感监测。

关键词：流感监测流行特征哨点医院

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

RO_(x) Budgets and O_(3) Formation during Summertime at Xianghe Suburban Site in the North China Plain

引用

Advances in Atmospheric Sciences 2021年第7期38卷 1209-1222页

作者： Min XUE jianzhong ma Guiqian TANG Shengrui TONG Bo HU Xinran ZHANG Xinru LI Yuesi WANG State Key Laboratory of Severe Weather&China Meteorological Administration Key Laboratory of Atmospheric Chemistry Chinese Academy of Meteorological SciencesBeijing 100081China State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China State Key Laboratory for Structural Chemistry of Unstable and Stable Species Beijing National Laboratory for Molecular SciencesChinese Academy of Sciences Research/Education Center for Excellence in Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijing 100190China Department of Chemistry Capital Normal UniversityBeijing 100081China

Photochemical smog characterized by high concentrations of ozone(O_(3)) is a serious air pollution issue in the North China Plain(NCP)region,especially in summer and *** this study,measurements of O_(3),nitrogen oxides(NO_(x)),volatile organic compounds(VOCs),carbon monoxide(CO),nitrous acid(HONO),and a number of key physical parameters were taken at a suburban site,Xianghe,in the NCP region during the summer of 2018 in order to better understand the photochemical processes leading to O_(3)formation and find an optimal way to control O_(3)***,the radical chemistry and O_(3)photochemical budget based on measurement data from 1−23 July using a chemical box model is *** daytime(0600−1800 LST)average production rate of the primary radicals referred to as RO_(x)(OH+HO2+RO2)is 3.9 ppbv h−*** photolysis is the largest primary RO_(x)source(41%).Reaction of NO2+OH is the largest contributor to radical termination(41%),followed by reactions of RO2+NO2(26%).The average diurnal maximum O_(3)production and loss rates are 32.9 ppbv h−1 and 4.3 ppbv h−1,*** tests without the HONO constraint lead to decreases in daytime average primary RO_(x)production by 55%and O_(3)photochemical production by 42%,highlighting the importance of accurate HONO measurements when quantifying the RO_(x)budget and O_(3)photochemical *** heterogeneous reactions of trace gases and radicals on aerosols,aerosol uptake of HO2 contributes 11%to RO_(x)sink,and the daytime average O_(3)photochemical production decreases by 14%.The O_(3)-NO_(x)-VOCs sensitivity shows that the O_(3)production at Xianghe during the investigation period is mainly controlled by VOCs.

关键词： photochemical smog RO_(x)budgets O_(3)production rate O_(3)chemical regime

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：