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Bioinspired Ultrasensitive Flexible Strain Sensors for Real-Time Wireless Detection of Liquid Leakage

NANO-MICRO LETTERS 2025年第1期17卷 1-18页

作者： Zhou, Weilong Du, Yu chen, yingying Zhang, Congyuan Ning, Xiaowei Xie, Heng Wu, Ting Hu, Jinlian Qu, Jinping Huazhong Univ Sci & Technol Sch Chem & Chem Engn Key Lab Mat Chem Energy Convers & Storage Minist EducHubei Key Lab Mat Chem & Serv Failure Wuhan 430074 Peoples R China Huazhong Univ Sci & Technol Hubei Engn Res Ctr Biomat & Med Protect Mat Sch Chem & Chem Engn Wuhan 430074 Peoples R China Wuhan Inst Technol Sch Mat Sci & Engn Wuhan 430205 Peoples R China City Univ Hong Kong Dept Biomed Engn Hong Kong 999077 Peoples R China

Micro-extrusion compression molding and surface modification were proposed for the mass fabrication of a superhydrophobic thermoplastic polyurethane sensor (TCGS).Inspired by scorpions, TCGS features Archimedean spiral crack arrays and micropores, achieving 218.13 sensitivity at 2% strain, a 4300% increase, and over 5000 usage cycles of *** robust superhydrophobicity of TCGS improves sensitivity and stability for detecting small-scale liquid leakage, allowing precise monitoring across various sizes and compositions while providing early warnings in various scenarios. Liquid leakage of pipeline networks not only results in considerable resource wastage but also leads to environmental pollution and ecological imbalance. In response to this global issue, a bioinspired superhydrophobic thermoplastic polyurethane/carbon nanotubes/graphene nanosheets flexible strain sensor (TCGS) has been developed using a combination of micro-extrusion compression molding and surface modification for real-time wireless detection of liquid leakage. The TCGS utilizes the synergistic effects of Archimedean spiral crack arrays and micropores, which are inspired by the remarkable sensory capabilities of scorpions. This design achieves a sensitivity of 218.13 at a strain of 2%, which is an increase of 4300%. Additionally, it demonstrates exceptional durability by withstanding over 5000 usage cycles. The robust superhydrophobicity of the TCGS significantly enhances sensitivity and stability in detecting small-scale liquid leakage, enabling precise monitoring of liquid leakage across a wide range of sizes, velocities, and compositions while issuing prompt alerts. This provides critical early warnings for both industrial pipelines and potential liquid leakage scenarios in everyday life. The development and utilization of bioinspired ultrasensitive flexible strain sensors offer an innovative and effective solution for the early wireless detection of liquid leakage.

关键词： Thermoplastic polyurethane Bioinspired Cracks Liquid leakage Flexible strain sensor

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Performance Improvement of Combined Cycle Power Plant Based on the Optimization of the Bottom Cycle and Heat Recuperation

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Journal of Thermal Science 2007年第1期16卷 84-89页

作者： Wenguo XIANG yingying chen Education Ministry Key Laboratory of Clean Coal Power Generation and Combustion Technology Southeast University Nanjing 210096 China

Many F class gas turbine combined cycle （GTCC） power plants are built in China at present because of less emission and high efficiency. It is of great interest to investigate the efficiency improvement of GTCC plant. A combined cycle with three-pressure reheat heat recovery steam generator （HRSG） is selected for study in this paper. In order to maximize the GTCC efficiency, the optimization of the HRSG operating parameters is performed. The operating parameters are determined by means of a thermodynamic analysis, i.e. the minimization of exergy losses. The influence of HRSG inlet gas temperature on the steam bottoming cycle efficiency is discussed. The result shows that increasing the HRSG inlet temperature has less improvement to steam cycle efficiency when it is over 590℃. Partial gas to gas recuperation in the topping cycle is studied. Joining HRSG optimization with the use of gas to gas heat recuperation, the combined plant efficiency can rise up to 59.05% at base load. In addition, the part load performance of the GTCC power plant gets much better. The efficiency is increased by 2.11% at 75% load and by 4.17% at 50% load.

关键词： Heat Recovery Steam Generators (HRSG) Thermodynamic optimization Exergy analysis Combined cycle power plant Efficiency Heat rate

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Progressive rectification network for irregular text recognition

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Science China(Information Sciences) 2020年第2期63卷 7-20页

作者： Yunze GAO yingying chen Jinqiao WANG Hanqing LU National Laboratory of Pattern Recognition Institute of Automation Chinese Academy of Sciences University of Chinese Academy of Sciences

Scene text recognition has received increasing attention in the research community. Text in the wild often possesses irregular arrangements, which typically include perspective, curved, and oriented *** of the existing methods do not work well for irregular text, especially for severely distorted text. In this paper, we propose a novel progressive rectification network(PRN) for irregular scene text recognition. Our PRN progressively rectifies the irregular text to a front-horizontal view and further boosts the recognition performance. The distortions are removed step by step by leveraging the observation that the intermediate rectified result provides good guidance for subsequent higher quality rectification. Additionally, by decomposing the rectification process into multiple procedures, the difficulty of each step is considerably ***, we specifically perform a rough rectification, and then adopt iterative refinement to gradually achieve optimal rectification. Additionally, to avoid the boundary damage problem in direct iterations, we design an envelope-refinement structure to maintain the integrity of the text during the iterative process. Instead of the rectified images, the text line envelope is tracked and continually refined, which implicitly models the transformation information. Then, the original input image is consistently utilized for transformation based on the refined envelope. In this manner, the original character information is preserved until the final transformation. These designs lead to optimal rectification to boost the performance of succeeding *** experiments on eight challenging datasets demonstrate the superiority of our method, especially on irregular benchmarks.

关键词： irregular text recognition progressive rectification iterative refinement

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Method development for estimating soil organic carbon content in an alpine region using soil moisture data

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Science China Earth Sciences 2020年第4期63卷 591-601页

作者： Qi LUO Kun YANG yingying chen Xu ZHOU Institute of Tibetan Plateau Research Chinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China Department of Earth System Science Tsinghua UniversityBeijing 100084China CAS Center for Excellence in Tibetan Plateau Earth System Beijing 100101China

The high soil organic carbon(SOC) content in alpine meadow can significantly change soil hydrothermal properties and further affect the soil temperature and moisture as well as the surface water and energy budget. Therefore, this study first introduces a parameterization scheme to describe the effect of SOC content on soil hydraulic and thermal parameters in a land surface model(LSM), and then the SOC content is estimated by minimizing the difference between observed and simulated surface-layer soil moisture. The accuracy of the estimated SOC content was evaluated using in situ observation data at a soil moisture and temperature-measuring network in Naqu, central Tibetan Plateau. Sensitivity experiments show that the optimum time window for stabilizing the estimation results cannot be shorter than three years. In the experimental area, the estimated SOC content can generally reflect the spatial distribution of the measurements, with a root mean square error of 0.099 m^3 m^(-3), a mean bias of 0.043 m^3 m^(-3), and a correlation coefficient of 0.695. The estimated SOC content is not sensitive to the temporal frequency of the soil moisture data input. Even if the temporal frequency is as low as that of current soil moisture products derived from passive microwave satellites, the estimation result is still stable. Therefore, by combining a high-quality satellite soil moisture product and a parameter optimization method, it is possible to obtain grid-scale effective parameter values, such as SOC content,for an LSM and improve the simulation ability of the LSM.

关键词： Land surface model Soil organic carbon content Soil porosity Soil parameter estimation

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Existence of solutions for sub-linear or super-linear operator equations

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Science China Mathematics 2015年第8期58卷 1653-1664页

作者： chen yingying DONG YuJun SHAN Yuan Department of Mathematics Nanjing Normal University Department of Mathematics Nanjing University

We investigate solutions to superlinear or sublinear operator equations and obtain some abstract existence results by minimax methods. These results apply to superlinear or sublinear Hamiltonian systems satisfying several boundary value conditions including Sturm-Liouville boundary value conditions and generalized periodic boundary value conditions, and yield some new theorems concerning existence of solutions or nontrivial solutions. In particular, some famous results about periodic solutions to superlinear or sublinear Hamiltonian systems by Rabinowitz or Benci and Rabinowitz are special cases of the theorems.

关键词： superlinear sublinear operator equations existence of solutions minimax methods Hamiltoniansystems

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Fairness-Aware Harvested Energy Efficiency Algorithm for IRS-Aided Intelligent Sensor Networks with SWIPT

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Computer Modeling in Engineering & Sciences 2023年第12期137卷 2675-2691页

作者： yingying chen Weiqiang Tan Shidang Li School of Geography Geomatics and PlanningJiangsu Normal UniversityXuzhou221116China School of Computer Science and Cyber Engineering Guangzhou UniversityGuangzhou510006China School of Physics and Electronic Engineering Jiangsu Normal UniversityXuzhou221116China

In this paper,a novel fairness-aware harvested energy efficiency-based green transmission scheme for wireless information and power transfer(SWIPT)aided sensor networks is developed for active beamforming of multiantenna transmitter and passive beamforming at intelligent reflecting surfaces(IRS).By optimizing the active beamformer assignment at the transmitter in conjunction with the passive beamformer assignment at the IRS,we aimtomaximize the minimumharvested energy efficiency among all the energy receivers(ER)where information receivers(IR)are bound to the signal-interference-noise-ratio(SINR)and the maximum transmitted power of the *** handle the non-convex problem,both semi-definite relaxation(SDR)and block coordinate descent technologies are ***,the original problem is transformed into two convex sub-problems which can be solved via semidefinite *** simulation results demonstrate that the IRS and energy beamformer settings in this paper provide greater system gain than the traditional experimental setting,thereby improving the fairness-aware harvested energy efficiency of the ER.

关键词： SWIPT intelligent reflecting surfaces fairness-aware harvested energy efficiency semi-definite relaxati

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Airport automatic detection in large space-borne SAR imagery

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Journal of Systems Engineering and Electronics 2010年第3期21卷 390-396页

作者： Shaoming Zhang Yi Lin Xiaohu Zhang yingying chen Research Center of Remote Sensing and Spatial Informatics Technology Tongji University Shanghai 200092 R R. China

A method to detect airports in large space-borne synthetic aperture radar（SAR） imagery is ***,the large SAR imagery is segmented according to amplitude characteristics using maximum a posteriori（MAP） estimator based on the heavytailed Rayleigh *** attention is then paid on the object of interest（OOI） extracted from the large *** minimumarea enclosing rectangle（MER） of OOI is created via a rotating calipers *** projection histogram（PH） of MER for OOI is then computed and the scale and rotation invariant feature for OOI are extracted from the statistical characteristics of PH.A support vector machine（SVM） classifier is trained using those feature parameters and the airport is detected by the SVM classifier and Hough *** application in space-borne SAR images demonstrates the effectiveness of the proposed method.

关键词： synthetic aperture radar(SAR) imagery airport detection image segmentation minimum-area enclosing rectangle support vector machine(SVM).

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The role of cloud height and warming in the decadal weakening of atmospheric heat source over the Tibetan Plateau

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Science China Earth Sciences 2015年第3期58卷 395-403页

作者： WU Hui YANG Kun NIU XiaoLei chen yingying Key Laboratory of Tibetan Environment Changes and Land Surface Processes Institute of Tibetan Plateau ResearchChinese Academy of Sciences University of Chinese Academy of Sciences

The warming over the Tibetan Plateau(TP) is very significant during last 30 years,but the thermal forcing has been *** thermal weakening is attributed mainly to the enhancement of the TOA(top of atmosphere) outgoing *** enhancement is opposite to the greenhouse-gas-induced weakening of the global mean TOA outgoing radiation and is also unable to be explained by the observed decrease of total cloud *** study presents the importance of cloud height change and the warming over the TP in modulating the TOA radiation budget and thus the thermal forcing during spring and *** the basis of surface observations and satellite radiation data,we found that both the TOA outgoing shortwave radiation and longwave radiation were enhanced during this *** former enhancement is due mainly to the increase of low-level cloud cover,which has a strong reflection to shortwave radiation,especially in *** latter enhancement is caused mainly by the planetary warming,and it is further enhanced by the decrease of total cloud cover in spring,as clouds extinguish outgoing longwave radiation emitted from the land ***,the radiative cooling enhancement and thus the thermal weakening over the TP is a response of the earth-atmosphere system to the unique change of cloud cover configuration and the rapid warming of the land ***,these trends in cloud cover and TOA outgoing radiation are not well represented in four reanalyses.

关键词： heat source radiative cooling trend Tibetan Plateau cloud cover

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Linkage between water soluble organic matter and bacterial community in sediment from a shallow, eutrophic lake, Lake Chaohu, China

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Journal of Environmental Sciences 2020年第12期32卷 39-46页

作者： Changming Yang Jiliang Sun yingying chen Jing Wu Yulai Wang Key Laboratory of Yangtze River Water Environment of the Ministry of Education Tongji UniversityShanghai 200092China Shanghai BaoSen Environmental Technology Co. Ltd.Shanghai 200439China School of Energy and Environment Anhui University of TechnologyMaanshan City 243002China

Lacustrine sediment played important roles in migration and transformation of its water soluble organic matter(WSOM), and the source and composition of WSOM would affect water trophic status and the fate of pollutants. However, we know little about the pathway of WSOM transformation and its driving bacterial communities in lacustrine sediment. In the present study, we investigated the spatial distribution patterns of sediment WSOM and its fluorescent fractions across Lake Chaohu using fluorescence spectroscopy, and explored WSOM compositional structure through our proposed calculated ratios. In addition, we also analyzed sediment bacterial community using Illumina sequencing technology, and probed the possible pathway of sediment WSOM transformation under the mediate of indigenous bacteria. Our results showed that the inflowing rivers affected the spatial distribution patterns of WSOM and its five fractions(including tyrosine-, tryptophan-, fulvic acid-, humic acid-like substances and soluble microbial productions), and sediment WSOM originated from fresh algae detritus or bacterial sources. In parallel, we also found that Proteobacteria(mainly γ-Proteobacteria and δ-Proteobacteria), Firmicutes(mainly Bacilli), Chloroflexi, Acidobacteria, Planctomycetes and Actinobacteria dominate sediment bacterial community. Furthermore, these dominant bacteria triggered sediment WSOM transformation, specifically, the humic acid-like substances could be converted into fulvic acid-like substances, and further degraded into aromatic protein-like and SMP substances. In addition, our proposed ratios(P-L:H-L, Ar-P:SMP and H-L ratio), as supplementary tool, were effective to reveal WSOM composition structure. These results figured out possible pathway of WSOM transformation, and revealed its microbial mechanism in lacustrine sediment.

关键词： Eutrophic lake DOM transformation Bacterial community EEMs-FRI Illumina sequencing

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Reaction mechanism and metal ion transformation in photocatalytic ozonation of phenol and oxalic acid with Ag^+/TiO_2

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Journal of Environmental Sciences 2014年第3期26卷 662-672页

作者： yingying chen Yongbing Xie Jun Yang Hongbin Cao Yi Zhang National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology Key Laboratory of Green Process and Engineering Institute of Process Engineering Chinese Academy of Sciences University of Chinese Academy of Sciences State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences

Photocatalytic ozonation of phenol and oxalic acid （OA） was conducted with a Ag^＋/TiO2 catalyst and different pathways were found for the degradation of different compounds. Ag^＋ greatly promoted the photocatalytic degradation of contaminants due to its role as an electron scavenger. It also accelerated the removal rate of OA in ozonation and the simultaneous process for its complex reaction with oxalate. Phenol could be degraded both in direct ozonation and photolysis, but the TOC removal rates were much higher in the simultaneous processes due to the oxidation of hydroxyl radicals resulting from synergetic effects. The sequence of photo-illumination and ozone exposure in the combined process showed quite different effects in phenol degradation and TOC removal. The synergetic effects in different combined processes were found to be highly related to the properties of the target pollutants. The color change of the solution and TEM result confirmed that Ag＋ was easily reduced and deposited on the surface of Tit2 under photo-illumination, and dissolved again into solution in the presence of ozone. This simple cycle of enrichment and distribution of Ag^＋ can greatly benefit the design of advanced oxidation processes, in which the sequences of ozone and photo-illumination can be varied according to the needs for catalyst recycling and the different properties of pollutants.

关键词： photocatalytic ozonation phenoloxalic acid Ag+/TiO2

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