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Excitation orthogonalized upconversion nanoprobe for instant visual detection of trinitrotoluene

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Nano Research 2023年第1期16卷 1491-1499页

作者： Xu Li Xu Zhao Xiaoyu Xu yang Lu jiahang Wu Fangmeng Liu Xu yan Peng Sun Chenguang Wang Xianggui Kong Xiaomin Liu Geyu Lu State Key Laboratory of Integrated Optoelectronics College of Electronic Science and EngineeringJilin UniversityChangchun 130012China Department of Public Security of Jilin Province Changchun 130051China State Key Laboratory of Luminescence and Applications Changchun Institute of OpticsFine Mechanics and physicsChinese Academy of ScienceChangchun 130033China

Excitation-emission orthogonalized luminescent upconversion nanoparticles(OUCNPs),which can respond to changes in external stimuli accordingly,show great promise in many intelligent applications.However,the construction of such materials mostly relies on the selective absorption of Nd3+and Yb3+at different wavelengths and the long-range energy migration between the layers,resulting in complex structures and limited orthogonal luminescence intensity.Herein,we developed a relatively simple structure of OUCNPs(β-NaErF4@NaLuF4@NaYF4:20%Yb,2%Er@NaLuF4),where the fluorescence emission switches from red to green when the excitation wavelength is shifted from 808 to 980 nm.This structure exhibits high-quality,independent,and non-interfering orthogonal luminescence properties without Nd3+sensitization and long-range energy migration.As a proof of concept,we demonstrate the application of the designed OUCNPs in anti-counterfeiting.We also prepared OUCNPs@PEI(PEI=polyethylenimine)self-referencing fluorescent probes to enable quantitative analysis of trinitrotoluene(TNT)in solution with a detection limit of 3.04μM.The probes can be made into test strips for portable on-site visual detection of TNT,and can also be used to image latent fingerprints and detect explosive residues in fingerprints simultaneously.The concept proposed in this work can be extended to the visual detection of a larger range of organic and biological molecules,and is highly promising for practical applications.

关键词： orthogonal luminescence NaErF4 core/multi-shell structure anti-counterfeiting trinitrotoluene(TNT)detection

数字时代下反垄断监管与隐私保护的关系初探:欧美研究进展回顾

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价格理论与实践 2022年第12期 44-48页

作者：贺嘉航方燕中国社会科学院大学

本文通过梳理探究欧美国家当前在反垄断政策和隐私保护之间关系的研究进展,揭示出制止和预防大数据带来的竞争缺乏和隐私安全方面的风险同等重要。反垄断政策强调充分有序竞争,或许对补救隐私侵害无效,不适宜简单将隐私安全问题纳入反... 详细信息

本文通过梳理探究欧美国家当前在反垄断政策和隐私保护之间关系的研究进展,揭示出制止和预防大数据带来的竞争缺乏和隐私安全方面的风险同等重要。反垄断政策强调充分有序竞争,或许对补救隐私侵害无效,不适宜简单将隐私安全问题纳入反垄断范畴进行分析。基于市场机制在隐私保护中存在的不足,应寻求反垄断政策和隐私政策各司其职的基础上适当合作。采取有针对性的立法途径,以清晰界定出互联网公司在数据收集、运用、管理等方面的权利义务。

关键词：隐私损害反垄断工具数据隐私利益消费者福利强制共享

Pyrenoviologen-based fluorescent sensor for detection of picric acid in aqueous solution

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Chinese Chemical Letters 2019年第11期30卷 1984-1988页

作者： Ni yan Jiale Song Fengyan Wang Longwang Kan jiahang Song Weiling Wang Wenqiang Ma Weidong Zhang Gang He Polymer Materials&Engineering Department School of Materials Science&EngineeringEngineering Research Center of Transportation MaterialsMinistry of EducationChang'an UniversityXi'an 710064China Frontier Institute of Science and Technology State Key Laboratory for Strength and Vibration of Mechanical StructuresXi'an Jiaotong UniversityXi'an 710054China

Two highly emissive pyrenoviologen derivatives were synthesized and used to fabricate fluorescent sensors for detection of picric acid(PA)with good sensitivity and selectivity.The sensitivity of the sensor was attributed to the specific electrostatic association effect of the cationic pyrenoviologens to the picrate anions,which also gave the sensor special selectivity among other compounds with similar structure.The electron transfer between them was attributed to the fluorescence response.Fluorescence lifetime measurements revealed that the quenching is static in nature.The novel and efficient pyrenoviologen derivatives-based sensors offered a strategy to fabricate real-life PA sensor.

关键词： Viologen Explosives Picric acid Pyrene Fluorescent sensor

Performance of surface radiation products of Greenland Ice Sheet using in-situ measurements

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Advances in Polar Science 2023年第3期34卷 190-219页

作者： CHE jiahang HUAI Baojuan SUN Weijun DING Minghu WANG Lei ZHANG Qinglin WU Jiake KANG Limin TENG Xinru yanG Xiaohong yan Jinpei ZHAO Shuhui College of Geography and Environment Shandong Normal UniversityJinan 250358China State Key Laboratory of Severe Weather China Academy of Meteorological SciencesBeijing 100081China Key Laboratory of Global Change and Marine-Atmospheric Chemistry Third Institute of OceanographyMinistry of Natural ResourcesXiamen 361005China School of Tourism Taishan UniversityTaian 271021China

Radiation is the direct energy source of the surface natural environment and the main driving force of climate change.It has increasingly become an important meteorological factor affecting the surface heat exchange and glacier mass balance,especially in the glacier changes of the Greenland Ice Sheet(Gr IS).Due to the harsh climatic conditions of Gr IS and sparse observed data,it has become an important way to obtain radiation data from reanalysis datasets.However,the applicability of these radiation data on Gr IS is uncertain and worth exploring.In this work,we evaluate five reanalysis datasets(the fifth generation of European Centre for Medium-Range Weather Forecasts(ERA5),European Centre for Medium-Range Weather Forecasts Interim Reanalysis(ERA-Interim),Japanese 55-year Reanalysis(JRA55),National Centers for Environmental Prediction Reanalysis II(NCEP2)and Modern-Era Retrospective analysis for Research and Applications,Version 2(MERRA-2))during 1997-2022 using observations from 26 Program for Monitoring the Greenland Ice Sheet(PROMICE)automatic weather stations(AWSs)and 3 K-transect AWSs on Gr IS.The conclusions are as follows:ERA5 has the best performances in downward shortwave radiation(SWD)as well as downward and upward longwave radiation(LWD and LWU),but the performance is not the best in upward shortwave radiation(SWU).Based on the radiation budget analysis with ERA5 during 1979-2022,the fluctuation of longwave radiation is greater than that of shortwave radiation.The seasonal variation of shortwave radiation is obvious,while that of longwave radiation is small.The increasing trend of longwave radiation may result from global warming,in which ice sheets absorb more solar radiation and the surface heats up significantly,emitting more LWU.

关键词： Greenland Ice Sheet downward shortwave radiation upward shortwave radiation downward longwave radiation upward longwave radiation reanalysis datasets automatic weather stations

数字时代下基础设施原则和网络中性原则的适用性争论与出路

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首都经济贸易大学学报 2022年第4期24卷 30-42页

作者：王璐方燕贺嘉航中国社会科学院当代中国研究所北京100009 北京大学信息技术高等研究院浙江杭州311215 中国社会科学院大学应用经济学院北京102488

基础设施原则和网络中性规制思路在互联网数字时代下的适用性争论及其潜在出路是重要的研讨课题。互联网领域歧视行为频发引发监管诉求,但是对互联网接入服务及其下游的大型内容和应用服务定性为基础设施,以便于采用基础设施原则规制互... 详细信息

基础设施原则和网络中性规制思路在互联网数字时代下的适用性争论及其潜在出路是重要的研讨课题。互联网领域歧视行为频发引发监管诉求,但是对互联网接入服务及其下游的大型内容和应用服务定性为基础设施,以便于采用基础设施原则规制互联网的思路面临理论和现实挑战。用网络中性(包括平台中立和搜索中立)原则规制互联网也缺乏理论和实证支撑。可以从竞争角度破解网络中性争论,从强调竞争政策和政府管制的互补性角度提升互联网反垄断的认识和形成一定的共识。

关键词：互联网监管关键设施网络中性平台中立搜索中立竞争政策

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复合热障涂层掺杂改性用陶瓷纤维研究进展

辽宁科技大学学报 2023年第4期46卷 254-261,307页

作者：李艳刘嘉航吕哲辽宁科技大学材料与冶金学院辽宁鞍山114051

随着涡轮发动机技术的不断发展,采用陶瓷材料的热障涂层存在严重问题。陶瓷材料力学性能较差,会降低热障涂层的断裂韧性,削弱涂层在高温环境下的热循环寿命,甚至降低涡轮发动机在高温环境下的服役可靠性。因此,优化陶瓷材料在高温环境... 详细信息

随着涡轮发动机技术的不断发展,采用陶瓷材料的热障涂层存在严重问题。陶瓷材料力学性能较差,会降低热障涂层的断裂韧性,削弱涂层在高温环境下的热循环寿命,甚至降低涡轮发动机在高温环境下的服役可靠性。因此,优化陶瓷材料在高温环境下的使用性能至关重要。本文阐述陶瓷纤维对热障涂层的增韧机理,综述氧化铝纤维、碳化硅纤维、YSZ纤维的性能特征、制备方法,以及纤维掺杂对涂层结构和性能的影响,并对未来纤维掺杂在热障涂层中的应用和发展前景进行展望。

关键词：热障涂层纤维掺杂改性纤维制备增韧机理力学性能

Geochemical characteristics of produced fluids from CBM wells and their indicative significance for gas accumulation in Daning-Jixian block,Ordos Basin

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Frontiers of Earth Science 2023年第3期17卷 661-678页

作者： Taotao yan Chao yanG Shuai ZHENG Yadong BAI Wei CHEN yanfei LIU Wenguang TIAN Shasha SUN Shangwen JIN jiahang WANG Zhenxing LIU Huifang YAO College of Mining Engineering Taiyuan University of TechnologyTaiyuan 030024China Coal Reservoir Laboratory of National Engineering Research Center of CBM Development&Utilization China University of GeosciencesBeijing 100083China China Coal Geology Group Co. LtdBeijing 100043China Research Institute of Petroleum Exploration and Development(Northwest) PetroChinaLanzhou 730000China Beijing Furuibao Energy Technology Company Beijing 100176China PetroChina Research Institute of Petroleum Exploration and Development Beijing 100083China Engineering Institute of SINOPEC Shanghai Offshore Oil&Gas Company Shanghai 200120China Exploration and Development Research Institute of PetroChina Huabei Oilfield Company PetroChinaRenqiu 062552China

The Daning-Jixian block,the eastern edge of the Ordos Basin,is one of the most potential areas for CO_(2)geological storage,enhanced coalbed methane recovery(ECBM)exploration and production in China in recent decades.The ionic composition and total dissolved solids(TDS)of the produced water,coal organic matter maturity,molecular composition and carbon isotope characteristics of the produced gas were utilized to analyze the hydrogeological condition,CBM generation and migration characteristics in this area.The CBM enrichment patterns and the geological impacts on gas well production characteristics were revealed.The optimal area for CBM development and CO_(2)geological storage in the study area were also proposed.Dominated by the Xueguan reverse fault zone,the hydraulic unit in this area can be divided into two parts(i.e.,the recharge-runoff zone in the east and the weak runoff-stagnation zone in the west).The thermogenic gas is dominating CBM genesis in this area.Secondary biogenic gas replenishment is only distributed in the eastern margin area,where theδ13C1 value is less than the thermal simulation results as an influence of hydrodynamic fractionation.Finally,two models of CBM formation and accumulation were proposed,1)thermogenic CBM migrated by hydrodynamic and resorbed for preservation at impermeable fault boundaries;2)thermogenic CBM trapped by fault and accumulated by hydrodynamic in slope zone.The gas production performance,generally increased from east to west,is mainly dominated by hydrogeological conditions.Generally,the west side of the fault zone is the enrichment and high-yield area for ECBM development and CO_(2)geological storage in the study area.

关键词： produced water and gas gas accumulation geochemical parameter CBM production CO_(2)geological storage Daning-Jixian block

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上转换纳米材料在食品安全检测中的研究进展

发光学报 2024年第5期45卷 824-836页

作者：孔明慧吴佳航卢扬闫旭卢革宇刘晓敏吉林大学电子科学与工程学院集成光电子学国家重点实验室吉林省先进气体传感器重点实验室吉林长春130012

近年来,上转换纳米材料在食品安全检测领域得到了快速的发展。上转换纳米粒子(Upconversion nanoparticles,UCNPs)可将近红外光转换为可见光,具有荧光背景低、化学稳定性好等特点,能够提高检测的灵敏度和准确性。本综述总结了当前常用的... 详细信息

近年来,上转换纳米材料在食品安全检测领域得到了快速的发展。上转换纳米粒子(Upconversion nanoparticles,UCNPs)可将近红外光转换为可见光,具有荧光背景低、化学稳定性好等特点,能够提高检测的灵敏度和准确性。本综述总结了当前常用的UCNPs表面功能化策略,概述了近年来UCNPs在食品安全检测中的研究进展,探讨了UCNPs在实际应用中所面临的一些问题和挑战,展望了UCNPs在食品安全检测领域未来的发展前景。

关键词：上转换纳米材料表面功能化策略荧光探针食品安全检测

Superlow Power Consumption Artificial Synapses Based on WSe2 Quantum Dots Memristor for Neuromorphic Computing

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Research 2023年第2期2022卷 101-113页

作者： Zhongrong Wang Wei Wang Pan Liu Gongjie Liu jiahang Li Jianhui Zhao Zhenyu Zhou Jingjuan Wang Yifei Pei Zhen Zhao Jiaxin Li Lei Wang Zixuan Jian Yichao Wang Jianxin Guo Xiaobing yan Key Laboratory of Brain-Like Neuromorphic Devices and Systems of Hebei Province College of Electronic and Information EngineeringHebei UniversityBaoding 071002China Department of Clinical Laboratory Medicine Taizhou Central Hospital(Taizhou University Hospital)Taizhou 318000China College of Physics Science and Technology Hebei UniversityBaoding 071002China

As the emerging member of zero-dimension transition metal dichalcogenide,WSe2 quantum dots(QDs)have been applied to memristors and exhibited better resistance switching characteristics and miniaturization size.However,low power consumption and high reliability are still challenges for WSe_(2) QDs-based memristors as synaptic devices.

关键词： Quantum dimension reliability