检索结果-南通市图书馆

chinese Science Bulletin 2006年第14期51卷 1736-1740页

作者： song zhiguang1,2.& wang cuiping1,{2., guangzhou Institute of geochemistry, chinese academy of sciences, guangzhou 51.640, china 2. guangzhou Research Center of Gas Hydrate, chinese academy of sciences, guangzhou 51.640, china 3. Graduate School of chinese academy of sciences, Beijing 100039, china state key {2. of organic geochemistry Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou China guangzhou Research Center of Gas Hydrate Chinese Academy of Sciences Guangzhou China Graduate School of chinese academy of sciences Beijing China

A group of 2.6,10,15,19-pentamethyli- cosenes (PMIΔ) containing 1―5 unsaturated double bonds has been identified in the sea floor sediments from the Gulf of Mexico at the Green Canyon 2.8 *** PMIΔ compounds are distributed between nC2. and nC2. on the mass chromatogram of aliphatic fraction. Their δ 13C values are very much depleted in 13C and in the range of ?86.7‰ to ?115.5‰, whereas the δ 13C values of companion n-alkanes range from ?2..4‰ to ?34.6‰. These unsaturated PMIΔ com-pounds are typical biomarkers derived from the an-aerobic oxidation of methane mediated by meth-ane-oxidizing archaeal bacteria and indicative of the gas seeps or even the occurrence of gas hydrates in the deep sea sediments.

关键词：生物标志墨西哥湾沉积物 PMIA 天然气水化物

SYNTHESIS AND CHARACTERIZATION OF NOVEL BIPOLAR PPV-BASED COPOLYMER CONTAINING TRIAZOLE AND CARBAZOLE UNITS

在线全文

学校读者我要写书评

暂无评论

chinese Journal of Polymer Science 2001年第6期19卷 615-621页

作者： Ze Liu Li-xiang wang Xia-bin Jing Fo-song wang The state key laboratory of Polymer Physics and Chemistry Changchun Institute of Applied Chemistry chinese academy of sciences, Changchun 13002., china 中科院长春应用化学所高分子物理与化学国家重点实验室吉林长春

Two new blue light-emitting PPV-based conjugated copolymers containing both an electron-withdrawing unit (triazole-TAZ) and electron-rich moieties (carbazole-CAR and bicarbazole-BCAR) were prepared by Wittig condensation polymerization between the triazole diphosphonium salt and the corresponding dialdehyde monomers. Their structures and properties were characterized by FT-IR, TGA, DSC, UV-Vis, PL spectroscopy and electrochemical measurements. The resulting copolymers are soluble in common organic solvents and thermally stable with a T-g of 147degreesC for TAZ-CAR-PPV and of 157degreesC for TAZ-BCAR-PPV. The maximum photoluminescence wavelengths of TAZ-CAR-PPV and TAZ-BCAR-PPV film appear at 460 nm and 480 nm, respectively. Cyclic voltammetry measurement demonstrates that TAZ-BCAR-PPV has good electrochemical reversibility, while TAZ-CAR-PPV exhibits the irreversible redox process. The triazole unit was found to be an effective pi-conjugation interrupter and can play the rigid spacer role in determining the emission colour of the resulting copolymer.

关键词： light-emitting polymer PPV-based bipolar polymer triazole-containing polymer carbazole-containing polymer

The distribution of phenylalkanes in the modern sediment associated with gas hydrate from the Gulf of Mexico

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2008年第6期27卷 71-82页

作者： wang cuiping SUN Hongwen {2. zhiguang ZHANG Tao College of Environmental Science and Engineering Nankai University Tianjin 300071 China state key {2. of organic geochemistry Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou 510640 China

Phenylalkanes with carbon numbers between 16 and 19, characterized by the main carbon-18, have been identified in the modern sediments collected from gas hydrate area from the Gulf of Mexico. The structure of phenylalkanes with four isomers for every carbon number was determined by means of their mass spectra and previous studies. The distribution of the series characterized by a low molecular mass was similar to the distribution of n-alkane, alkylcyclohexanes and alkylbenzenes in each sample. There were differences in the distribution of the phenylalkane series between the S - 1, S - 4, S - 7, S - 9 samples and the S - 8, S - 10 and S - 11 samples. The phenylalkanes might be derived from Archaea associated with anaerobic oxidation of methane （AOM） processes in S - 1, S -4, S -7 and S -9 samples according to their distribution resembled with the distribution of the extract from a type of Archaea. The distribution of alkylcyclohexanes and alkylbenzenes in S - 1, S - 4, S - 7 and S - 9 sample was found to be similar to each other. The odd-over-even predominance of alkylcyclohexanes was seen as the input of some bac- terial.

关键词： phenylalkane gas hydrate Gulf of Mexico

珠三角城乡大气有机气溶胶来源、生成机制及吸入沉积通量

在线全文

学校读者我要写书评

暂无评论

环境科学学报 2024年第1期44卷 15-28页

作者：伍莉娜黄山刘袁宋奇聪胡伟伟陈卫旷烨王小月李伟彭钰雯陈多宏岳玎利宋伟袁斌王新明邵敏暨南大学环境与气候研究院广州511443 粤港澳环境质量协同创新联合实验室广州511443 中国科学院广州地球化学研究所有机地球化学国家重点实验室广州510640 广东省生态环境监测中心国家环境保护区域空气质量部检测重点实验室广州510308

为探究珠三角地区秋季亚微米有机气溶胶(OA)的污染特征、健康风险及其城乡差异,本研究对基于黑碳高分辨率飞行时间气溶胶质谱仪(SP-AMS)观测的广州(城市)及鹤山(乡村)气溶胶数据进行了分析.结果显示,在城乡的两次秋季观测期间,PM,平均... 详细信息

为探究珠三角地区秋季亚微米有机气溶胶(OA)的污染特征、健康风险及其城乡差异,本研究对基于黑碳高分辨率飞行时间气溶胶质谱仪(SP-AMS)观测的广州(城市)及鹤山(乡村)气溶胶数据进行了分析.结果显示,在城乡的两次秋季观测期间,PM,平均质量浓度分别为(2..87±2..11)μg·m^(-3)和(40.08±16.05)μg·m^(-3),其中OA占比最高,分别为57.4%和52.1%.基于正交矩阵因子分析法(PMF)进行来源解析,发现在珠三角城乡两地二次有机气溶胶都是OA的首要组分,分别占64.0%和66.7%.城市地区OA受日间光氧化反应贡献明显,而乡村地区OA在夜间至清晨出现显著抬升,可能与夜间二次生成相关.相对湿度(RH)升高指示的液相反应及日间光氧化对城市低氧化态OA生成均有促进作用,光氧化也能促进乡村低氧化态OA的日间生成,而夜间SOA(Night-OA)则主要在高RH的条件下贡献更为显著.基于模型计算了亚微米级OA在人体呼吸系统中的分粒径沉积通量,发现其在肺泡区域沉积通量最大,两地沉积通量的粒径分布呈现双峰分布,但城区OA在小粒径(12. nm)的沉积峰值更加突出,因此可能具有更大的健康风险.

关键词：有机气溶胶(OA) 来源解析污染特征沉积通量黑碳气溶胶质谱仪珠三角地区

Two-dimensional Cu-porphyrin nanosheet membranes for nanofiltration

在线全文

学校读者我要写书评

暂无评论

Nano Research 2023年第5期16卷 6290-6297页

作者： Jiahao Cai Shizheng song Lijie Zhu Qipeng Lu Zong Lu Yanying Wei Haihui wang School of Chemistry&Chemical Engineering Guangdong Provincial Key Lab of Green Chemical Product TechnologyState Key Laboratory of Pulp and Paper EngineeringSouth China University of TechnologyGuangzhou 510640China School of Instrument Science and Opto-Electronics Engineering Beijing Information Science and Technology UniversityBeijing 100192China School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China Beijing key laboratory for Membrane Materials and Engineering Department of Chemical EngineeringTsinghua UniversityBeijing 100084China

A kind of two-dimensional(2.)metal-organic framework(MOF)material,Cu-meso-tetrakis(4-carboxyphenyl)porphine(Cu-TCPP)nanosheets with wrinkled and flat morphologies are used as building blocks to assemble membranes by vacuum filtration(VF)and electrophoretic deposition(EPD)as energy-efficient nanofiltration(NF)membranes to remove dyes from *** the nanosheets with wrinkled structure can provide additional water transport channels,thereby increasing the water permeance,in the premise of a high rejection(>97.0%)for the dye brilliant blue G(BBG)(1.60 nm×1.90 nm),the water permeance of the membrane assembled by the wrinkled nanosheets(~1170 nm)is about 4 times that of the membrane assembled by the flat nanosheets(~530 nm),reaching 16.39 L·m^(−2.·h^(−1)·bar^(−1).Additionally,the use of the relatively flat nanosheets and the membrane preparation method of electrophoretic deposition is more conducive to stack nanosheets orderly and reduce ***,the water permeance of the membrane prepared by EPD(~1170 nm)with flat nanosheets is about twice that of the membrane prepared by VF(~530 nm),achieving 9.40 L·m^(−2.·h^(−1)·bar^(−1)with similar rejection(>97.0%)of dye evans blue(EB)(3.10 nm×1.2. nm).Furthermore,these membranes still exhibit good separation performance at high pressure of 0.6 *** with diverse structures and various membrane fabrication processes provide new directions for the separation performance optimization of 2. MOF materials for water purification.

关键词： two-dimensional material membrane metal-organic framework(MOF) nanofiltration nanosheet morphology electrophoretic deposition

Visible-light driven room-temperature coupling of methane to ethane by atomically dispersed Au on WO_(3)

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

Journal of Energy Chemistry 2021年第10期30卷 195-202,I0006页

作者： Xing Yang Wu Zhiyuan Tang Xiaoxu Zhao Xin Luo Stephen John Pennycook song Ling wang china-UK Low Carbon College Shanghai Jiao Tong UniversityShanghai 201306China School of Environmental Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China state key {2. of Optoelectronic Materials and Technologies Centre for Physical Mechanics and BiophysicsSchool of PhysicsSun Yat-sen UniversityGuangzhou 510275GuangdongChina Institute Department of Materials Science and Engineering National University of SingaporeSingapore 117575Singapore Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092China

Gold(Au)as co-catalyst is remarkable for activating methane(CH4),especially atomically dispersed Au with maximized exposing active sites and specific electronic ***,singlet oxygen(^(1)O_(2.)typically manifests a mild redox capacity with a high selectivity to attack organic ***(PMS)favors to produce oxidative species 102.during the photocatalytic ***,combining atomic Au as co-catalyst and ^(1)O_(2. as oxidant is an effective strategy to selectively convert ***,we synthesized atomically dispersed Au on WO_(3)(Au/WO_(3)),where Au was in the forms of single atoms and *** room temperature,such Au/WO_(3) exhibited enhanced photocata lytic conversion of CH4 to CH3 CH3 with a selectivity,up to 94%,under visible *** radicals-pathway mechanism of CH4 coupling has also been investigated through detection and trapping experiment of active *** calculations further interpret the electronic structure of Au/WO_(3) and tip-enhanced local electric field at the Au sites for promoting CH4 conversion.

关键词： Photocatalysis Single-atom Au Methane Ethane Visible light

Emerging contaminants:A One Health perspective

在线全文

学校读者我要写书评

暂无评论

The Innovation 2024年第4期5卷 140-170,139页

作者： Fang wang Leilei Xiang Kelvin Sze-Yin Leung Martin Elsner Ying Zhang Yuming Guo Bo Pan Hongwen Sun Taicheng An Guangguo Ying Bryan WBrooks Deyi Hou Damian EHelbling Jianqiang Sun Hao Qiu Timothy MVogel Wei Zhang Yanzheng Gao Myrna JSimpson Yi Luo Scott XChang Guanyong Su Bryan MWong Tzung-May Fu Dong Zhu Karl JJobst Chengjun Ge Frederic Coulon Jean Damascene Harindintwali Xiankui Zeng Haijun wang Yuhao Fu Zhong Wei Rainer Lohmann Changer Chen Yang {2. Concepcion Sanchez-Cid Yu wang Ali El-Naggar Yiming Yao Yanran Huang Japhet Cheuk-Fung Law Chenggang Gu Huizhong Shen Yanpeng Gao Chao Qin Hao Li Tong Zhang Natàlia Corcoll Min Liu Daniel SAlessi Hui Li Kristian KBrandt Yolanda Pico Cheng Gu Jianhua Guo Jianqiang Su Philippe Corvini Mao Ye Teresa Rocha-Santos Huan He Yi Yang Meiping Tong Weina Zhang Fidèle Suanon Ferdi Brahushi Zhenyu wang Syed AHashsham Marko Virta Qingbin Yuan Gaofei Jiang Louis A.Tremblay Qingwei Bu Jichun Wu Willie Peijnenburg Edward Topp Xinde Cao Xin Jiang Minghui Zheng Taolin Zhang Yongming Luo Lizhong Zhu Xiangdong Li DamiàBarceló Jianmin Chen Baoshan Xing Wulf Amelung Zongwei Cai Ravi Naidu Qirong Shen Janusz Pawliszyn Yong-guan Zhu Andreas Schaeffer Matthias C.Rillig Fengchang Wu Gang Yu James M.Tiedje state key {2. of Soil and Sustainable Agriculture Institute of Soil ScienceChinese Academy of SciencesNanjing 210008China University of chinese academy of sciences Beijing 100049China Department of Chemistry Hong Kong Baptist UniversityHong KongChina HKBU Institute of Research and Continuing Education Shenzhen Virtual University ParkShenzhenChina Technical University of Munich TUM School of Natural SciencesInstitute of Hydrochemistry85748 GarchingGermany School of Resources&Environment Northeast Agricultural UniversityHarbin 150030China Climate Air Quality Research UnitSchool of Public Health and Preventive MedicineMonash UniversityMelbourneVICAustralia Faculty of Environmental Science&Engineering Kunming University of Science&TechnologyKunming 650500China Ministry of Education key laboratory of Pollution Processes and Environmental Criteria College of Environmental Science and EngineeringNankai UniversityTianjin 300350China Guangdong key laboratory of Environmental Catalysis and Health Risk Control School of Environmental Science and EngineeringInstitute of Environmental Health and Pollution ControlGuangdong University of TechnologyGuangzhou 510006China Ministry of Education key laboratory of Environmental Theoretical Chemistry South China Normal UniversityGuangzhouGuangdong 510006China Department of Environmental Science Baylor UniversityWacoTXUSA Center for Reservoir and Aquatic Systems Research(CRASR) Baylor UniversityWacoTXUSA School of Environment Tsinghua UniversityBeijing 100084China School of Civil and Environmental Engineering Cornell UniversityIthacaNY 14853USA key laboratory of Microbial Technology for Industrial Pollution Control of Zhejiang Province Zhejiang University of TechnologyHangzhou 310014China School of Environmental Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China Laboratoire d’Ecologie Microbienne Universite Claude Bernard Lyon 1UMR CNRS 5557UMR INRAE 1418VetAgro Sup69622 VilleurbanneFrance Department of Pla

Environmental pollution is escalating due to rapid global development that often prioritizes human needs over planetary *** global efforts to mitigate legacy pollutants,the continuous introduction of new substances remains a major threat to both people and the *** response,global initiatives are focusing on risk assessment and regulation of emerging contaminants,as demonstrated by the ongoing efforts to establish the UN’s Intergovernmental Science-Policy Panel on Chemicals,Waste,and Pollution *** review identifies the sources and impacts of emerging contaminants on planetary health,emphasizing the importance of adopting a One Health *** for monitoring and addressing these pollutants are discussed,underscoring the need for robust and socially equitable environmental policies at both regional and international *** actions are needed to transition toward sustainable pollution management practices to safeguard our planet for future generations.

关键词： pollution planet contaminants

Fast screening compositions of PM2.5 by ATR-FTIR： Comparison with results from IC and OC/EC analyzers

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

Journal of Environmental sciences 2018年第9期30卷 76-88页

作者： Xu Yu Wei song Qingqing Yu Sheng Li Ming Zhu Yanli Zhang Wei Deng Weiqiang Yang Zhonghui Huang Xinhui Bi Xinming wang state key {2. of organic geochemistry and Guangdong key {2. of Environmental Protection and Resources Utilization Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou 510640 China Center for Excellence in Regional Atmospheric Environment Institute of Urban Environment Chinese Academy of SciencesXiamen 361021 China Uniuersity of chinese academy of sciences Beijing 100049 China Department of Chemistry Hong Kong University of Science and Technology Kowloon Hong Kong China

Chemical speciation of fine particles or PM2.5 collected on filters is still a cosily and time- consuming task. In this study, filter-based PM2.5 samples were collected during November-December 2.13 at four sites in guangzhou, and the major components were fast screened （~ 7 rain per filter sample） by Attenuated Total Reflectance （ATR）-Fourier Transform Infrared Spectroscopic （FTIR） in comparison with that measured by organic carbon/Element carbon （OC/ EC） analyzer and Ion Chromatography （IC）. The concentrations of nitrate, ammonium, sulfate, primary organic carbon （POC） and secondary organic carbon （SOC） measured by OC/EC and IC analyzers were better correlated with their infrared absorption peak heights at 132. cm 1 for nitrate, 1435, 3045 and 32.5 cm^-1 for ammonium, 615 cm^-1 for sulfate, 690, 760 and 890 cm^-1 for POC and 1640 and 1660 cm^-1 for SOC respectively, during polluted days （PM2.5 〉 75 μg/m^3） than during clean days （PM2.5〈 75 μg/m^3）. With the evolution of a haze episode during our field campaign, the concentrations of the major PM2.5 components displayed consistent variations with their infrared absorption peak heights, suggesting ATR-FTIR could be a fast and useful technique to characterize filter-based PM2.5 compositions particularly during pollution events although cautions should be taken when PM2.5 levels are low. Notably, elevated PM2.5 mass concentrations occurred with enhanced ratios of [NO^-3][SO^2.4] and [NH^＋4]/[SO^2.4], implying that nitrogenous components play vital roles in the PM2.5 pollution events in the study region.

关键词： ATR-FTIR Fine particles (PM2.5) Haze episode Sulfate Nitrate Ammonium organic carbon

Vertical profiles of biogenic volatile organic compounds as observed online at a tower in Beijing

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental sciences 2020年第9期32卷 33-42页

作者： Huina Zhang Yanli Zhang Zhonghui Huang WJoe FActon Zhaoyi wang Eiko Nemitz Ben Langford Neil Mullinger Brian Davison Zongbo Shi Di Liu Wei song Weiqiang Yang Jianqiang Zeng Zhenfeng Wu Pingqing Fu Qiang Zhang Xinming wang state key {2. of organic geochemistry and Guangdong key {2. of Environmental Protection and Resources Utilization Guangzhou Institute of GeochemistryChinese Academy of SciencesGuangzhou 510640China Center for Excellence in Regional Atmospheric Environment Institute of Urban Environment Chinese Academy of SciencesXiamen 361021China University of chinese academy of sciences Beijing 100049China state Environmental Protection key {2. of Environmental Pollution Health Risk Assessment and Guangdong key {2. of Water and Air Pollution Control South China Institute of Environmental ScienceMinistry of Ecology and EnvironmentGuangzhou 510655China Lancaster Environment Centre Lancaster UniversityLancaster LA14YQUK Centre for Ecology and Hydrology Edinburgh EH260QBUK School of Geography Earth and Environmental sciences University of BirminghamBirmingham B152TTUK Institute of Surface-Earth System Science Tianjin UniversityTianjin 300072China Institute of Atmospheric Physics Chinese Academy of SciencesBeijing 100029China Beijing key laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing 100084China

Vertical profiles of isoprene and monoterpenes were measured by a proton transfer reactiontime of flight-mass spectrometry(PTR-ToF-MS) at heights of 3,15,32.64,and 102.m above the ground on the Institute of Atmospheric Physics(IAP) tower in central Beijing during the winter of 2.16 and the summer of *** mixing ratios were larger in summer due to much stronger local emissions whereas monoterpenes were lower in summer due largely to their consumption by much higher levels of *** mixing ratios were the highest at the 32.m in summer(1.64±0.66 ppbV) and at 15 m in winter(1.41±0.64 ppbV) with decreasing concentrations to the ground and to the 102.m,indicating emission from the tree canopy of the surrounding *** mixing ratios were the highest at the 3 m height in both the winter(0.71±0.42.ppbV) and summer(0.16±0.10 ppbV) with a gradual decreasing trend to 102.m,indicting an emission from near the ground *** lowest isoprene and monoterpene mixing ratios all occurred at 102.m,which were 0.71±0.42.ppbV(winter) and 1.35±0.51 ppbV(summer) for isoprene,and 0.42.0.2. ppbV(winter) and0.07±0.06 ppbV(summer) for *** in the summer and monoterpenes in the winter,as observed at the five heights,showed significant mutual *** the winter monoterpenes were positively correlated with combustion tracers CO and acetonitrile at 3 m,suggesting possible anthropogenic sources.

关键词： winter Vertical mixing

Eugenunilones A-H:rearranged sesquiterpenoids from Eugenia uniflora

在线全文

学校读者我要写书评

暂无评论

organic Chemistry Frontiers 2022年第3期9卷 667-675页

作者： Mu Chen Jia-Qing Cao song Ang Ting-Ni Zeng Ni-Ping Li Tang-Jia Yang Jun-Shan Liu Yan Wu Wen-Cai Ye Lei wang Centre for Bioactive Natural Molecules and Innovative Drugs and Guangdong Province Key Laboratory of Pharmacodynamic Constituents of TCM and New Drugs ResearchCollege of PharmacyJinan UniversityGuangzhou 510632P.R.China Third Level Research laboratory of state Administration of Traditional {2. Medicine School of Traditional Chinese MedicineSouthern Medical UniversityGuangzhou 510515P.R.China

Six rearranged sesquiterpenoid dimers and monomers with four types of new skeletons,meso-eugenunilone A(meso-1),(+)-and(−)-eugenunilones B−F[(+)-and(−)-2.6],along with two new biogenetically related members(+)-and(−)-... 详细信息

关键词： nil skeleton sesquiterpenoid