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Sensitive humidity sensor based on moisture-driven energy generation

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Nano Research 2024年第6期17卷 5578-5586页

作者： Qingchao Ni Qing lou Chenglong Shen Guangsong Zheng Runwei Song Jingnan Hao Jialu Liu Jinyang Zhu Jinhao Zang Lin Dong chong-Xin Shan Henan Key Laboratory of Diamond Optoelectronic Materials and Devices Key Laboratory of Materials PhysicsMinistry of Educationand School of Physics and MicroelectronicsZhengzhou UniversityZhengzhou 450052China State Centre for International Cooperation on Designer Low-Carbon&Environmental Materials and School of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450001China

The emergence of novel self-powered humidity sensors has attracted considerable attention in the fields of smart electronic devices and personal ***,self-powered humidity sensors have been fabricated using a moisture-driven energy generation(MEG)device based on asymmetric tubular graphitic carbon nitride(g-CN)films prepared on anodized aluminum(AAO)*** a relative humidity(RH)of 96%,the MEG device can provide an open-circuit voltage of 0.47 V and a short-circuit current of 3.51μA,with a maximum output power of 0.08μ*** inherent self-powered ability and humidity response via current variation,an extraordinary response of 1.78×106%(41%-96%RH)can be gained from the MEG *** possible power generation mechanism is that g-CN/AAO heterostructure can form ion gradient and diffusion under the action of moisture to convert chemical potential into electrical potential,evoking a connaturally sensitive response to ***-powered respiration monitoring device based on the sensor is designed to monitor human movement(sitting,warming up,and running)and sleep status(normal,snoring,and apnea),maintaining excellent stability during cumulative 12-h respiration *** self-powered humidity sensing technology has promising potential for extensive integration into smart electronic and round-the-clock health monitoring devices.

关键词： graphitic carbon nitride moisture-driven energy generation humidity sensor respiration monitoring

WATER DISTRIBuTION MODELING APPLICATION IN SMALL CITY

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WATER DISTRIBUTION MODELING APPLICATION IN SMALL CITY

基于uAV勘察与层次分析法的安阳许家沟露天矿山地质风险评价

第4届流域管理和城市供水国际会议

作者： Jacky Lei Chi Tou Paul Lam Kam Fai thurston lou chong u Dominique Kon Sun Tack The Macao Water Supply Co.Ltd The Macao Water Supply Co.Ltd The Macao Water Supply Co.Ltd The Macao Water Supply Co.Ltd

＜正＞ In order to have a better management of water distribution network system,water distribution modeling isbecoming famous tool in water *** techniques of construction and calibration of a model is curial and *** of the resulting calibrated model is also an important *** employing a comprehensive waterdistribution simulation model（hydraulic and water quality model）,one can better manage of the network design,residentchlorine and bacteria related *** discussion,here,is about the construction and implementation of a hydraulic modelsimulation,which can be applied in water distribution network in small cities,*** or Hong Kong.

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中国矿业 2024年第3期33卷 177-186页

作者：江雷娄嘉慧史冲河南省有色金属地质矿产局第二地质大队河南郑州450016 郑州大学政治与公共管理学院河南郑州450001

矿产资源是社会经济发展的重要基础,在社会发展与生态建设统筹的背景下,矿山地质风险防治与生态环境修复成为矿业研究的焦点。矿山地质风险的分类和量化是矿山地质风险防治和修复的基础,有利于因地制宜制定治理措施。本文基于uAV勘察和... 详细信息

矿产资源是社会经济发展的重要基础,在社会发展与生态建设统筹的背景下,矿山地质风险防治与生态环境修复成为矿业研究的焦点。矿山地质风险的分类和量化是矿山地质风险防治和修复的基础,有利于因地制宜制定治理措施。本文基于uAV勘察和层次分析法对安阳许家沟露天矿山群地质风险进行了评价,根据勘察结果总结出边坡崩塌、矿坑坍塌和水土流失3个主要地质风险,各风险层选取4个因素,共12个评价指标,并利用ArcGIS栅格计算模块对选取的12个评价因素进行叠加分析。研究结果显示:高度风险区、显著风险区、一般风险区和稍有风险区的面积分别为13500 m^(2)、39000 m^(2)、26750 m^(2)、45750 m^(2),分别占研究区总面积的10.8%、31.2%、21.4%、36.6%;综合矿山地质风险排序为河西胜利II区<豫隆I区<豫安III区;从豫隆I区到豫安III区,随着研究子区面积的减少,边坡崩塌风险贡献率逐渐降低,矿坑坍塌风险和水土流失风险逐渐升高。研究结果表明,边坡崩塌评分与矿山地质评分呈现双峰态势,而矿坑坍塌风险和水土流失风险呈单峰态势。本文提出危岩清除、矿渣回填、边坡修整、客土恢复林地和耕地、养护治理等治理措施,从而降低矿山地质风险,修复矿山生态。

关键词： uAV勘察层次分析法露天矿山矿山地质风险评价生态修复

1960-2020年河南省极端降水时空演变特征

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华北水利水电大学学报（自然科学版） 2024年第4期45卷 16-26页

作者：李志刚娄嘉慧史冲郑州大学政治与公共管理学院河南郑州450001 郑州大学当代资本主义研究中心河南郑州450001 河南省有色金属地质矿产局第二地质大队河南郑州450016

全球变暖加快了水文循环速度,导致极端降水事件频发,增强了城市排水负荷和洪涝风险,并影响了区域气候的时空特征。在河南省均匀选取26个雨量站对1960—2020年61年间的降水资料进行研究,采用趋势分析、Kriging插值、M-K突变分析、Morlet... 详细信息

全球变暖加快了水文循环速度,导致极端降水事件频发,增强了城市排水负荷和洪涝风险,并影响了区域气候的时空特征。在河南省均匀选取26个雨量站对1960—2020年61年间的降水资料进行研究,采用趋势分析、Kriging插值、M-K突变分析、Morlet小波变换和Spearman相关系数等方法对河南省9个极端降水指数的时空演变特征进行分析。结果显示:河南省年降水量呈上升趋势,极端降水事件呈下降趋势,河南省整体气候逐渐变得湿润。河南省极端降水指数具有显著空间差异,东南部极端降水风险显著大于西北部。除降水强度、最大连续降水日数和1 d最大降水量外,其余指数与年降水量、汛期和6—9月的各月降水量具有良好的相关性,这对于评估年降水量及其年内分布特征、极端降水事件频率有较好的参考作用。结果表明:降水从短历时高强度向长历时低强度演变,要应对此类长历时极端降水的风险,防涝思路应从提高短时间大量排水能力转变到提高长时间低强度吸收降水能力。

关键词：极端降水河南省趋势分析相关系数时空演变

First-principles study on persistent luminescence mechanism of LiYGeO_(4):Eu^(3+)

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稀土学报:英文版 2023年第10期41卷 1519-1524,I0002页

作者： Shihang Zhou Bibo lou chong-Geng Ma Min Yin Xinjiang Key Laboratory for Luminescence Minerals and Optical Functional Materials School of Physics and Electronic EngineeringXinjiang Normal UniversityUrumqi830054China CAS Key Laboratory of Strongly-Coupled Quantum Matter Physics and School of Physical SciencesUniversity of Science and Technology of ChinaHefei230026China School of Optoelectronic Engineering&CQuPT-BuL Innovation Institute Chongqing University of Posts and TelecommunicationsChongqing400065China

LiYGeO_(4):Eu^(3+)is a red persistent luminescent material with a duration of more than 21 *** its persistent luminescence phenomenon has been fully studied,its detailed mechanism is still the subject of ***,we performed first-principles study on the intrinsic point defects and the charge transfer processes in LiYGeO_(4):Eu^(3+)to reveal the mechanism of persistent *** results show that,under charge transfer excitation,the electron is promoted from the valence band(oxygen ion ligand)to the central Eu^(3+)ion to form Eu^(2+)ion in LiYGeO_(4):Eu^(3+),leaving a hole *** charge transfer excitation can relax quickly to the excited state of the Eu^(3+)ion,which produces the characteristic^(5)D_(0)→^(7)F_(J)(J=0-6)*** Li vacancies(V_(Li))and the antisite defects of Li replacing Y site(Li_(Y))and Y replacing Li site(YLi)are main defects,while O vacancies(V_(O))are less important in concentration due to high formation *** and Liy can serve as hole-type traps,with the trap depths suitable for trapping the holes produced by *** delayed release holes can combine with the Eu^(2+)left behind by the illumination,leading to persistent *** VLi trap is shallower than Li_(Y),and the latter is responsible for the long duration of persistent luminescence.A schematic based on the calculation results is constructed to illustrate the mechanism of persistent luminescence.

关键词： Persistent Iuminescence Eu^(3+) Charge transfer Point defects First-principles Rare earths

Fabry-Perot interference and piezo-phototronic effect enhanced flexible MoS_(2) photodetector

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Nano Research 2022年第5期15卷 4395-4402页

作者： Xuexia Chen Xun Yang Qing lou Yuan Zhang Yancheng Chen Yacong Lu Lin Dong chong-Xin Shan Henan Key Laboratory of Diamond Optoelectronic Materials and Devices Key Laboratory of Materials PhysicsMinistry of Educationand School of Physics and MicroelectronicsZhengzhou UniversityZhengzhou 450052China

Flexible photodetectors(PDs)are indispensable components for next-generation wearable ***,two-dimensional(2D)materials have been implemented as functional flexible optoelectronic devices due to their characteristics of atomically thin layers,excellent flexibility,and strain *** this work,we developed a flexible photodetector based on MoS_(2)/NiO heterojunction,and Fabry-Perot(F-P)and piezo-phototronic effect have been employed to enhance the responsivity(R)and external quantum efficiency(EQE)of the *** F-P effect is utilized to improve the optical absorption of the MoS_(2),resulting in an enhancement in the photoluminescence(PL)of monolayer MoS_(2) and the EQE of the photodetector by 30 and 130 times,*** flexible photodetector exhibits an ultrahigh detectivity(D*)of 2.6×10^(14) Jones,which is the highest value ever reported for flexible MoS_(2) *** piezo-potential of monolayer MoS_(2) decreases the valence band offset at the interface of MoS_(2)/NiO,which increases the transfer efficiency of the photon-generated carriers *** 1.17%tensile strain,the R of the flexible photodetector can be enhanced by 271%.This research may provide a universal strategy for the design and performance optimization of 2D materials heterostructures for flexible optoelectronics.

关键词： flexible photodetector MoS_(2) Fabry-Perot(F-P)interference piezo-phototronic effect

ultrasensitive broadband position-sensitive detector based on graphitic carbon nitride

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Nano Research 2023年第1期16卷 1277-1285页

作者： Xuexia Chen Xun Yang Qing lou Yongzhi Tian Zhiyu Liu Chaofan Lv Yancheng Chen Lin Dong chong-Xin Shan Henan Key Laboratory of Diamond Optoelectronic Materials and Devices Key Laboratory of Material PhysicsMinistry of EducationSchool of Physics and MicroelectronicsZhengzhou UniversityZhengzhou 450052China

As a typical two-dimensional material,graphitic carbon nitride(g-CN)has attracted great interest because of its distinctive electronic,optical,and catalytic ***,the absence of a feasible route toward large-area and high-quality films hinders its development in ***,high-quality g-CN films have been grown on Si substrate via a vapor-phase transport-assisted condensation *** g-CN/Si heterojunction shows an obvious response to ultraviolet–visible-near infrared photons with a responsivity of 133 A·W−1,which is two orders of magnitude higher than the best value ever reported for g-CN photodetectors.A position-sensitive detector(PSD)has been developed using the lateral photovoltaic effect of the g-CN/Si *** PSD shows a wide response spectrum ranging from 300 to 1,100 nm,and a position sensitivity and rise/decay time of 395 mV·mm−1 and 3.1/50μs,***,the application of the g-CN/Si heterojunction photodetector in trajectory tracking and acoustic detection has been realized for the first *** work unveils the potential of g-CN for large-area photodetectors,and prospects for their applications in trajectory tracking and acoustic detection.

关键词： graphitic carbon nitride(g-CN) position-sensitive detector(PSD) lateral photovoltaic effect(LPE) heterojunction trajectory tracking acoustic detection

基于自发辐射分析的高碱煤燃烧炉内在线监测技术研究进展

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热力发电 2024年第1期53卷 24-37页

作者：陈装黄华汉傅勇强李华鸿方顺利王志超陈端张冲王浩帆马帅姚斌娄春湛江中粤能源有限公司广东湛江524000 西安热工研究院有限公司陕西西安710054 华中科技大学煤燃烧国家重点实验室湖北武汉430074

准东煤等高碱煤在新疆地区储量巨大,但其富含的碱金属元素极易导致炉膛受热面沾污、结渣等问题,会影响锅炉运行的安全性,研发高碱煤高效清洁燃烧发电技术对实现“双碳”目标有重要意义。总结了基于自发辐射分析的高碱煤燃烧炉内在线监... 详细信息

准东煤等高碱煤在新疆地区储量巨大,但其富含的碱金属元素极易导致炉膛受热面沾污、结渣等问题,会影响锅炉运行的安全性,研发高碱煤高效清洁燃烧发电技术对实现“双碳”目标有重要意义。总结了基于自发辐射分析的高碱煤燃烧炉内在线监测技术的研究进展,重点介绍了发射光谱技术、自发辐射图像处理及成像技术在高碱煤燃烧监测领域的研究现状及应用情况,进而对其发展趋势和动态进行探讨。发射光谱技术通过对火焰发出的不同波长光谱辐射信号进行处理获取温度与组分,近期,已广泛用于测量工业炉膛燃烧火焰温度和气相碱金属质量浓度,并基于此对炉内结渣趋势进行定性判断。自发辐射图像处理及成像技术具备信号空间分布的解析能力,利用CCD、CMOS等面阵传感器获取炉内自发辐射图像,基于图像处理与热辐射成像原理,结合辐射反问题求解方法,可以获得燃烧场在三维空间的温度分布以及二维壁温分布,使结渣的三维可视化监测成为可能。未来需基于发射光谱技术、自发辐射图像处理及成像技术对二维或者三维的受热面结渣沾污进行监测,结合炉内燃烧温度与气相碱金属质量浓度等参数分布,建立高碱煤燃烧受热面结渣沾污的定量判断指标,最终达到对受热面结渣沾污在线预测的目标。

关键词：高碱燃料自发辐射分析火焰发射光谱图像处理热辐射成像

Pressure-induced photoluminescence enhancement and ambient retention in confined carbon dots

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Nano Research 2022年第3期15卷 2545-2551页

作者： Qing lou Xigui Yang Kaikai Liu Zhongzheng Ding Jinxu Qin Yizhe Li Chaofan Lv Yuan Shang Yuewen Zhang Zhuangfei Zhang Jinhao Zang Lin Dong chong-Xin Shan Henan Key Laboratory of Diamond Optoelectronic Materials and Devices Key Laboratory of Material PhysicsMinistry of EducationSchool of Physics and MicroelectronicsZhengzhou UniversityZhengzhou 450001China Supercomputer Center Zhengzhou UniversityZhengzhou 450001China

Piezochromic luminescent materials have shown great potential in advanced optoelectronic ***,most of luminescent materials usually undergo emission quenching under external ***,we demonstrate for the first time that the photoluminescence of carbon dots(CDs)confined within sodium hydroxide can be enhanced when high pressure is *** exhibit a 1.6-fold fluorescence enhancement compared with pristine ***,the enhanced fluorescence intensity can be retained after the release of pressure to ambient conditions.A combination of experimental analysis and theoretical simulations indicates that such an enhanced emission is mainly attributed to the strong conﬁnement resulting from the sodium hydroxide matrix,which can separate the CDs spatially and restrict the nonradiative *** results provide a rational strategy for manipulating the optical properties of CDs with enhanced and retainable photoluminescence(PL)performance,thus opening up a venue for designing luminescent CDs-based materials.

关键词： carbon nanodots high pressure piezochromic fluorescence confinement effect emission enhancement