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BTO/P(VDF-TrFE) Nanofiber-based Artificial Lateral Line Sensor with Drag Enhancement Structures

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Journal of Bionic Engineering 2020年第1期17卷 64-75页

作者： Zhiqiang Ma yuanhang xu Yonggang Jiang Xiaohe Hu Deyuan Zhang Institute of Bionic and Micro-Nano Systems School of Mechanical Engineering and AutomationBeihang UniversityBeijing 100191China Beijing Advanced Innovation Center for Biomedical Engineering Beihang UniversityBeijing 100191China

A flexible Artificial Lateral Line(ALL)sensor is presented in this paper,featuring a barium titanate/polyvinylidene fluoride?trifluoroethylene[BTO/P(VDF?TrFE)]nanofiber mat,a hydrogel cupula,and a constriction structure in the canal..The excellent piezoelectric performance of the BTO/P(VDF-TrFE)nanofiber,superior to that of a pristine P(VDF-TrFE)nanofiber,helps improve the sensitivity of the ALL sensor.The hydrogel cupula imitating the cupula in a fish lateral line system enhances the ALL sensitivity through a material-induced drag enhancement mechanism.The constriction mimics the diminution structure found in fish canal lateral line systems,endowing the canal ALL sensor with enhanced sensitivity through a structure-induced drag enhancement mechanism.The contributions of the hydrogel cupula and constriction structure in offering an enhanced sensing performance are studied experimentally,in comparison with conventional ALL sensors.The constriction structure in the canal helps modify the frequency response of the canal ALL sensor,i.e.,attenuating low frequencies while amplifying high frequencies.The proposed biomimetic flow sensor is expected to aid in the development of smart skins for underwater robotics applications.

关键词： lateral line flow sensor biomimetics piezoelectric nanofiber enhanced perception

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室内多用户在线协同指纹定位算法

小型微型计算机系统 2024年第3期45卷 699-706页

作者：许远航张鑫宇乐燕芬上海理工大学光电信息与计算机工程学院上海200093

针对室内环境中多个用户同时申请定位服务的场景,提出一种基于多用户在线协同的室内指纹定位算法.考虑到邻近的多个用户在同一时段观测的Wi-Fi接入点(Access Point,AP)的接收信号强度指示(Received Signal Strength Indicator,RSSI)信... 详细信息

针对室内环境中多个用户同时申请定位服务的场景,提出一种基于多用户在线协同的室内指纹定位算法.考虑到邻近的多个用户在同一时段观测的Wi-Fi接入点(Access Point,AP)的接收信号强度指示(Received Signal Strength Indicator,RSSI)信号服从相似的空间分布,从而可利用该信号强度的大小来校准用户的估计位置.算法首先由目标用户的AP覆盖向量确定邻近的候选参考节点(Reference Point,RP)以及协同定位用户;利用协同定位用户观测的RSSI信息对候选RP进行可信度评估,并结合目标用户的RSSI信号与各候选RP指纹的相似度,筛选候选RP,利用WKNN(Weighted K-Nearest Neighbors)算法获得经协同定位用户校准后的目标用户的校准估计位置;同时,算法还融合了子集定位的思想,利用目标用户的在线RSSI信号构建用于校准定位的多个AP子集,并由位置密度检测方法剔除异常校准位置,确定目标的最终估计位置.算法涉及的协同用户的发现和位置的校准都无需额外的硬件支持,对用户透明.典型室内环境中的实验结果表明,多用户在线协同定位算法有效抑制了大定位误差,提高了定位性能.

关键词： Wi-Fi定位指纹定位在线协同定位候选RP

基于HPLC指纹图谱和网络药理学的高良姜质量标志物预测分析

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中国野生植物资源 2024年第4期43卷 10-21页

作者：赖祉妃许远航邓敏贞周中流温镇榕黄丽平岭南师范学院广东湛江524048 广州中医院广州中医药大学第二附属医院广东广州510120

目的:将指纹图谱与网络药理学相结合预测分析高良姜的质量标志物(Q-Marker)。方法:采用高效液相色谱法(HPLC)对高良姜进行成分分析,对20批高良姜提取物成分进行相似度评价、聚类分析和主成分分析,筛选高良姜提取物中Q-Marker候选成分;... 详细信息

目的:将指纹图谱与网络药理学相结合预测分析高良姜的质量标志物(Q-Marker)。方法:采用高效液相色谱法(HPLC)对高良姜进行成分分析,对20批高良姜提取物成分进行相似度评价、聚类分析和主成分分析,筛选高良姜提取物中Q-Marker候选成分;对筛选的Q-Marker候选成分进行靶点收集和网络药理学分析,构建“成分-靶点-通路”网络,并预测高良姜提取物的Q-Marker。结果:20批高良姜指纹图谱相似度集中在0.952~1.000范围,提示不同产地和批次的高良姜提取物整体组成上具有一致性;聚类分析和主成分分析显示海南的高良姜样品聚类趋势比较一致,云南、广东和广西的高良姜未按产地归类,不同产地的高良姜在成分上存在着差异,说明产地只是高良姜质量的影响因素之一。根据HPLC共有成分以及聚类分析和主要成分分析,得到2个Q-Marker候选成分,分别为高良姜素和槲皮素。经网络药理学分析筛选6个关键活性成分,6个关键要点和21条通路。结论:本研究初步预测槲皮素、山奈酚和高良姜素为高良姜的Q-Marker,为高良姜的质量控制予与参考,同时也为高良姜功效关联物质的研究及作用机制的阐释奠定了基础。

关键词：高良姜质量标志物网络药理学指纹图谱化学成分

Regulation of interlayer channels of graphene oxide nanosheets in ultra-thin Pebax mixed-matrix membranes for CO_(2) capture

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Chinese Journal of Chemical Engineering 2024年第3期67卷 257-267页

作者： Feifan Yang yuanhang Jin Jiangying Liu Haipeng Zhu Rong xu Fenjuan Xiangli Gongping Liu Wanqin Jin State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical EngineeringNanjing Tech UniversityNanjing 211816China Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology School of Petrochemical EngineeringChangzhou UniversityChangzhou 213164China Shandong Production and Research Long Membrane Technology Development Co. Ltd.Yantai Economic Development ZoneYantai 265505China

For the application of carbon capture by membrane process,it is crucial to develop a highly permeable CO_(2)-selective membrane.In this work,we reported an ultra-thin polyether-block-amide(Pebax)mixedmatrix membranes(MMMs)incorporated by graphene oxide(GO),in which the interlayer channels were regulated to optimize the CO_(2)/N_(2) separation performance.Various membrane preparation conditions were systematically investigated on the influence of the membrane structure and separation performance,including the lateral size of GO nanosheets,GO loading,thermal reduction temperature,and time.The results demonstrated that the precisely regulated interlayer channel of GO nanosheets can rapidly provide CO_(2)-selective transport channels due to the synergetic effects of size sieving and preferential adsorption.The GO/Pebax ultra-thin MMMs exhibited CO_(2)/N_(2) selectivity of 72 and CO_(2) permeance of 400 GPU(1 GPU=106 cm^(3)(STP)·cm^(2)·s^(-1)·cmHg^(-1)),providing a promising candidate for CO_(2) capture.

关键词： Mixed-matrix membrane Ultra-thin membrane Pebax Graphene oxide CO_(2) capture

Recent advances,challenges,and perspectives on carbon capture

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Frontiers of Environmental Science & Engineering 2024年第6期18卷 75-104页

作者： Shihan Zhang Yao Shen Chenghang Zheng Qianqian xu Yifang Sun Min Huang Lu Li Xiongwei Yang Hao Zhou Heliang Ma Zhendong Li yuanhang Zhang Wenqing Liu Xiang Gao Institute of Energy and Sustainable Development Zhejiang University of TechnologyHangzhou 310014China College of Environment Zhejiang University of TechnologyHangzhou 310014China Baima Lake Laboratory Hangzhou 310051China Institute of Carbon Neutrality College of Energy EngineeringZhejiang UniversityHangzhou 310027China State Key Joint Laboratory of Environmental Simulation and Pollution Control College of Environmental Sciences and EngineeringPeking UniversityBeijing 100871China Key Laboratory of Environmental Optics and Technology Anhui Institute of Optics and Fine MechanicsHFIPSChinese Academy of SciencesHefei 230031China

Carbon capture,utilization and storage(CCUS)technologies play an essential role in achieving Net Zero Emissions targets.Considering the lack of timely reviews on the recent advancements in promising CCUS technologies,it is crucial to provide a prompt review of the CCUS advances to understand the current research gaps pertained to its industrial application.To that end,this review first summarized the developmental history of CCUS technologies and the current large-scale demonstrations.Then,based on a visually bibliometric analysis,the carbon capture remains a hotspot in the CCUS development.Noting that the materials applied in the carbon capture process determines its performance.As a result,the state-of-the-art carbon capture materials and emerging capture technologies were comprehensively summarized and discussed.Gaps between state-of-art carbon capture process and its ideal counterpart are analyzed,and insights into the research needs such as material design,process optimization,environmental impact,and technical and economic assessments are provided.

关键词： Carbon capture,utilization and storage Visualization analysis Research hotspots and trends CO2 capture technology

利用分子机器的组装与分解构建pH敏感性谷胱甘肽过氧化物人工酶

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化工学报 2022年第8期73卷 3669-3678页

作者：安绍杰许洪峰李思许远航李佳锡沈阳化工大学材料科学与工程学院辽宁沈阳110142

谷胱甘肽过氧化物酶(GPx)是体内一种重要的抗氧化酶,对GPx的人工模拟能够拓展其体外应用,利用生命体内天然pH差异实现响应的pH敏感性GPx人工酶更是有着广泛的潜在应用。然而目前制备的pH敏感性GPx人工酶普遍存在活性较低的缺点,本文设... 详细信息

谷胱甘肽过氧化物酶(GPx)是体内一种重要的抗氧化酶,对GPx的人工模拟能够拓展其体外应用,利用生命体内天然pH差异实现响应的pH敏感性GPx人工酶更是有着广泛的潜在应用。然而目前制备的pH敏感性GPx人工酶普遍存在活性较低的缺点,本文设计合成了同时含有高活性GPx催化中心和两个伯胺基团的乙胺单碲醚分子,酶促反应动力学的分析结果表明其二级反应速率常数高达10^(1)L·mol^(-1)·min^(-1)数量级。pH=6时,乙胺单碲醚分子能够与葫芦[6]脲分子(CB[6])组装形成分子机器,此时活性中心被包埋于CB[6]的疏水空腔之中,仅能展现出(0.04±0.02)μmol·min·μmol的活性;pH=7时,分子机器部分分解,能够展现出高达(0.35±0.06)μmol·min^(-1)·μmol^(-1)的活性。因此,通过调控体系pH在6和7之间变化,借助分子机器的组装及部分分解调控人工酶活性的关闭与开启,从而构建了高活性的pH敏感性GPx人工酶。

关键词：酶谷胱甘肽过氧化物酶催化生物催化分子机器 pH敏感性

Riverine sulfate sources and behaviors in arid environment,Northwest China:Constraints from sulfur and oxygen isotopes

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Journal of Environmental Sciences 2024年第3期137卷 716-731页

作者： Yifu xu Wenjing Liu Bing xu Zhifang xu Key Laboratory of Cenozoic Geology and Environment Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China Innovation Academy for Earth Science Chinese Academy of SciencesBeijing 100029China University of Chinese Academy of Sciences Beijing 100049China

The fate of riverine sulfate ion (SO_(4)^(2-)) and its environmental effects in arid environment are difficult to evaluate due to its complicated sources and strongly coupled behaviors with water cycle which is significantly modified by humans.To understand the sulfur cycle in aquatic systems in arid environment,the chemical and sulfur and oxygen isotopic compositions (δ^(34)S_(SO4)and δ^(18)O_(SO4)) of major rivers around the Badain Jaran Desert,northwestern China,were investigated.These rivers had averaged SO_(4)^(2-)content at 1336μmol/L,over 10times higher than the global average.The δ^(34)S_(SO4)and δ^(18)O_(SO4)values ranged from-5.3‰to+11.8‰and+1.6‰to+12.8‰,respectively.The end-member analysis and the inverse model showed that riverine sulfate was mainly derived from evaporites dissolution (0-87%),sulfide oxidation (13%-100%) and precipitation (0-33%),indicating heterogeneity in sulfur sources and behaviors along the river drainage with the lithology variations and climate gradients.Multiple isotopic tools combining with hydro-chemistry compositions could be applied to reveal sulfur cycle in arid environment.Based on the calculation,sulfide oxidation plays the primary role in the headwater and upstream in the Qilian-Mountains area,where sulfide is widely exposed.While the proportion of evaporites dissolution contributing to riverine sulfate is much higher in downstream in a drier environment.Besides,less precipitation and higher temperature can lead to more intensive evaporation,affecting the process of sulfide oxidation and enhancing the rates of evaporites dissolution and sulfate precipitation in the basin.

关键词： Sulfur and oxygen isotopes Source apportionment Inverse model Arid environment Inland rivers Northwestern China

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跨异构设备的室内Wi-Fi指纹定位方法

数据采集与处理 2022年第3期37卷 703-714页

作者：金施嘉珞乐燕芬许远航上海理工大学光电信息与计算机工程学院上海200093

基于Wi-Fi位置指纹的室内定位中,采用异构设备在同一位置、同一时间采集的无线信号接收强度(Received signal strength indicator,RSSI)存在差异,使得离线指纹库与不同用户在线采集的信号难以兼容而影响定位精度。针对该问题,本文提出... 详细信息

基于Wi-Fi位置指纹的室内定位中,采用异构设备在同一位置、同一时间采集的无线信号接收强度(Received signal strength indicator,RSSI)存在差异,使得离线指纹库与不同用户在线采集的信号难以兼容而影响定位精度。针对该问题,本文提出一种适应异构设备的定位算法。该方法首先通过接入点(Access point,AP)选择,构建信号稳定的离线指纹数据库,再使用普氏分析法(Procrustes analysis,PA)对指纹库标准化,消除异构设备引入的信号差异。在线阶段采用余弦相似度(Cosine similarity,CS)算法得到目标的位置估计。在2种典型室内环境中利用4台手机测试了所提方法的定位性能,并分析了影响定位性能的因素。实验结果表明,所提方法在2种室内环境中的平均定位误差分别为2.96 m和2.29 m,相比较加权K近邻(Weight K-nearest neighbor,WKNN)算法定位精度分别提高了21.3%和21.6%。

关键词：室内定位接收信号强度指示余弦相似度异构设备

Biohythane production from two-stage anaerobic digestion of food waste:A review

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Journal of Environmental Sciences 2024年第5期139卷 334-349页

作者： Xiaona An Ying xu Xiaohu Dai State Key Laboratory of Pollution Control and Resource Reuse School of Environmental Science and EngineeringTongji UniversityShanghai 200092China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092China

The biotransformation of food waste(FW)to bioenergy has attracted considerable research attention as a means to address the energy crisis and waste disposal problems.To this end,a promising technique is two-stage anaerobic digestion(TSAD),in which the FW is transformed to biohythane,a gaseous mixture of biomethane and biohydrogen.This review summarises the main characteristics of FW and describes the basic principle of TSAD.Moreover,the factors influencing the TSAD performance are identified,and an overview of the research status;economic aspects;and strategies such as pre-treatment,co-digestion,and regulation of microbial consortia to increase the biohythane yield from TSAD is provided.Additionally,the challenges and future considerations associated with the treatment of FW by TSAD are highlighted.This paper can provide valuable reference for the improvement and widespread implementation of TSAD-based FW treatment.

关键词： Two-stage anaerobic digestion(TSAD) Food waste(FW) Methane production Hydrogen production