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A healable, mechanically robust and ultrastretchable ionic conductive elastomer for durably wearable sensor

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Nano Research 2024年第4期17卷 3369-3378页

作者： Guoxian Zhang Chunmei Li JiaoJun Tan Mingqi Wang Yafeng Ren Feijie Ge Qiuyu Zhang key Laboratory of Special Functional and Smart Polymer Materials of Ministry of industry and Information technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi'an 710072China College of Bioresources Chemical and Materials Engineering National Demonstration Center for Experimental Light Chemistry Engineering EducationShaanxi University of Science&TechnologyXi’an 710021China

The ionic conductive elastomers show great promise in multifunctional wearable electronics,but they currently suffer from liquid leakage/evaporation or mechanical *** ionic conductive elastomers integrating non-volatility,mechanical robustness,superior ionic conductivity,and ultra-stretchability remains urgent and ***,we developed a healable,robust,and conductive elastomer via impregnating free ionic liquids(ILs)into the ILs-multigrafted poly(urethane-urea)(PUU)elastomer networks.A crucial strategy in the molecular design is that imidazolium cations are largely introduced by double-modification of PUU and centipede-like structures are obtained,which can lock the impregnated ILs through strong ionic *** this system,the PUU matrix contributes outstanding mechanical properties,while the hydrogen bonds and ionic interactions endow the elastomer with self-healing ability,conductivity,as well as non-volatility and *** fabricated ionic conductive elastomers show good conductivity(3.8×10^(-6) S·cm^(-1)),high mechanical properties,including tensile stress(4.64 MPa),elongation(1470%),and excellent healing ability(repairing efficiency of 90%after healing at room temperature for 12 h).Significantly,the conductive elastomers have excellent antifatigue properties,and demonstrate a highly reproducible response after 1000 uninterrupted extension-release *** work provides a promising strategy to prepare ionic conductive elastomers with excellent mechanical properties and stable sensing capacity,and further promote the development of mechanically adaptable intelligent sensors.

关键词： ionic conductive elastomers poly(urethane-urea)(PUU) ionic interactions centipede-like self-healing

Simple-structured hydrophilic sensors for sweat uric acid detection with laser-engraved polyimide electrodes and cellulose paper substrates

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Chinese Chemical Letters 2024年第3期35卷 443-448页

作者： Linhe Xu Xueshan Hu Shuang Zhou Ze Zhang Junxian Zhang Chao Li Daxian Zuo Hao Liu Gang Chen Jiayu Wan Jinsong Tao State key Lab of Pulp and Paper Engineering South China University of TechnologyGuangzhou 510640China Future Battery Research Center Global Institute of Future TechnologyShanghai Jiao Tong UniversityShanghai 200240China

Accurate detection of uric acid(UA)is crucial for diagnosing gout,yet traditional sweat-based UA sensors continue to face challenges posed by complex and costly electrode fabrication methods,as well as weakly hydrophilic ***,we designed and developed simple,low-cost,and hydrophilic sweat UA detection sensors constructed by carbon electrodes and cellulose paper *** carbon electrodes were made by carbonized polyimide films through a simple,one-step laser engraving *** electrodes are porous,possess a large specific surface area,and are flexible and *** substrates were composed of highly hydrophilic cellulose paper that can effectively collect,store,and transport *** constructed electrodes demonstrate high sensitivity of 0.4μA Lμmol^(-1)cm^(-2),wide linear range of 2–100μmol/*** addition,our electrodes demonstrate high selectivity,excellent reproducibility,high flexibility,and outstanding stability against mechanical bending,temperature variations,and extended storage ***,our sensors have been proven to provide reliable results when detecting UA levels in real sweat and on real human *** envision that these sensors hold enormous potential for use in the prognosis,diagnosis,and treatment of gout.

关键词： Laser-engraved carbon Polyimide Cellulose paper Hydrophilicity Sweat uric acid

Online review driven route planning of green cold chain logistics: considering service attribute preference

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Journal of Traffic and transportation Engineering(English Edition) 2024年

作者： Qubo Yu Xuze Ye Xueying Jiang Shaoquan Ni Kun Liu Xiaowei Liu School of transportation and Logistics， Southwest Jiaotong University New Corridor Logistics Group Co.， Ltd.of Sichuan Port and Shipping Investment National Engineering Laboratory of Integrated transportation Big Data Application technology， Southwest Jiaotong University

For the long-distance cold chain transportation， this study focuses on green route planning in the cold chain multimodal transport network， considering the customers’ preferences on transport service attributes. To extract customers' preferences from online reviews， we build the bidirectional gated recurrent units (biGRU) and Logit framework. The coefficients representing the preferences for transport service attributes are calculated and integrated into the route planning model. To enhance the reliability of the routes， we utilize fuzzy set theories to describe travel time， transport cost coefficient， and capacity as trapezoidal fuzzy numbers. Then， we develop a fuzzy route planning model aims to minimize transportation cost， damage cost， refrigeration cost， carbon emission cost， and reliability cost. The numerical experiments are conducted on the new land and sea corridor in southwest China. The proposed method can plan the route which meet the customers’ preferences on transportation cost， travel time， reliability and carbon emission. Moreover， logistics companies can strike a balance between cost and reliability by setting confidence coefficients for travel time and capacity. Furthermore， carbon trading policy implements the significant effect on carbon emission reduction in cold chain logistics， when the trading price is 2 RMB per unit.

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Novel protection systems for the improvement in soil and water stability of expansive soil slopes

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Journal of Mountain science 2023年第10期20卷 3066-3083页

作者： MA Shao-kun HE Ben-fu MA Min HUANG Zhen CHEN Sheng-jia YUE Huan School of Civil Engineering and Architecture Guangxi UniversityNanning 530004China State key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures Guangxi UniversityNanning 530004China

To improve the soil and water stability of expansive soil slopes and reduce the probability of slope failure,novel protection systems based on polymer waterproof coatings(PWC)were used in this ***,three groups of expansive soil slope model tests were designed to investigate the effects of polyester nonwovens and PWC(P-PWC)composite protection system,three-dimensional vegetation network and PWC(T-PWC)composite protection system,and nonprotection on the soil and water behavior in the slopes under precipitation–evaporation *** results showed that the moisture change of P-PWC and T-PWC composite protected slopes was significantly smaller than that of bare slope,which reduced the sensitivity of slope moisture to environmental changes and improved its *** soil temperature of the slope protected by the P-PWC and T-PWC systems at a depth of 70 cm increased by 5.6℃ and 2.7℃,*** PWC composite protection systems exhibited better thermal storage performance,which could increase the utilization of shallow geothermal ***,the maximum average crack widths of the bare slopes were 7.89 and 3.17 times those of the P-PWC and TPWC protected slopes,respectively,and the maximum average crack depths were 6.87 and 3 times those of the P-PWC and T-PWC protected slopes,*** PPWC protection system weakened the influence of hydro–thermal coupling on the slopes,inhibited the development of cracks on the slopes,and reduced the soil *** maximum soil erosion of slopes protected by P-PWC and T-PWC systems was 332 and 164 times lower than that of bare slope,*** P-PWC and T-PWC protection systems achieved excellent"anti-seepage and moisture retention"and anti-erosion effects,thus improving the soil and water stability of *** findings can provide important guiding reference for controlling rainwater infiltration and soil erosion in expansive soil slope projects.

关键词： Soil and water stability Expansive soil slope Polymer waterproof coating Model test Soil erosion

Mechanical Properties and Microcosmic Properties of Self-Compacting Concrete Modified by Compound Admixtures

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Journal of Renewable Materials 2022年第4期10卷 897-908页

作者： Song Yang Bing Qi Zubin Ai Zhensheng Cao Shiqin He Lijun Li Power China Roadbridge Group Co. Ltd.Beijing100048China College of Civil Engineering North China University of TechnologyBeijing100043China Sichuan Tieke New Building Materials Co. Ltd.Chengdu610000China

It has become a research hotspot to explore raw material substitutes of *** is important to research the mechanical properties of self-compacting concrete(SCC)with slag powder(SP)and rubber particle(RP)replacing cement and coarse aggregate,respectively.12 kinds of composite modified self-compacting concrete(CMSCC)specimens were prepared by using 10%,20%and 30%SP and 30%,40%,50%and 60%*** rheological properties,mechanical properties and microstructure of the CMSCC were *** indicate that the workability,compressive strength,splitting tensile strength and flexural strength of CMSCC prepared by 20%SP and less than 40%RP are *** order to maximize the utilization of waste materials,20%SP and 40%RP can be used as the optimal ratio of the combined *** microstructure shows that the addition of proper amount of SP is conducive to the formation of increasingly more uniform C-S-H gel.C-SH gel can fill the internal pores of the sample and enhance the adhesion between the aggregate,thus improving the mechanical properties of *** has a rougher surface and lower density and stiffness,which inhibits the workability and mechanical properties of *** above research results have important theoretical and practical significance for the selection of raw materials of self-compacting concrete and the rational use of industrial wastes.

关键词： Self-compacting concrete slag powder rubber particle mechanical properties microstructure

Characteristics of debris flow impact on a double-row slit dam

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Journal of Mountain science 2023年第2期20卷 415-428页

作者： WANG Zhuang LIU Dao-chuan YOU Yong LYU Xiao-bo LIU Jin-feng ZHAO Wan-yu SUN Hao WANG Dong-wei LIU Yang key Laboratory of Mountain Hazards and Earth Surface Process Institute of Mountain Hazards and EnvironmentChinese Academy of SciencesChengdu 610041China University of Chinese Academy of sciences Beijing 100049China Sichuan Highway Planning SurveyDesign and Research Institute Ltd.Chengdu 610041China Sichuan Tongchuan Engineering technology Development Co. Ltd.Chengdu 610041China State Grid Sichuan Electric Power Transmission&Transformation Construction Co. Ltd.Chengdu 610051China

To accurately predict impact loads can ensure the safe operation of debris flow control *** instantaneous impact process is usually considered in the calculation of the debris flow impact force;however,the redistribution of an impact load after structural regulation is *** this study we deduced the theoretical calculation of a debris flow impact on a double-row slit dam,and carried out a verification experiment on the debris flow *** calculation model considers the influence of the debris flow properties,dam arrangement and pile *** results show that the impact force of the debris flow is obviously affected by the bulk *** the bulk density is 21 kg/m^(3),the maximum impact force on the pile dam is 1.15 times that when the bulk density is 15 kg/m^(3),but the time it takes for the debris flow to pass through the dam body is reduced by 60%.The larger the relative pile spacing,the more sufficient the flow space and the lower the maximum impact *** maximum impact force of relative pile spacing of 0.8 is 12%less than that of elative pile spacing of *** horizontal distribution of the impact force in the mud depth range is *** maximum impact force on the centre pier is 1.3 times that of a side pier,and the maximum impact force on the dam body appears at the top of the mud depth *** the vertical distribution of the impact force,the maximum impact force at the highest mud mark is approximately 70%of that of the *** the increase in the relative pile spacing,the longitudinal maximum impact force distribution first decreases and then increases.

关键词： Debris flow force Slit dam Fluctuations Flume model test

Normalization method for asphalt mixture fatigue equation under different loading frequencies

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Journal of Central South University 2015年第7期22卷 2761-2767页

作者：吕松涛郑健龙 National Engineering Laboratory of Highway Maintenance technology Key Laboratory of Highway Engineering(Ministry of Education)School of Traffic and Transportation EngineeringChangsha University of Science and Technology

In order to analyze the effect of different loading frequencies on the fatigue performance for asphalt mixture,the changing law of asphalt mixture strengths with loading speed was revealed by strength tests under different loading *** equations of asphalt mixtures based on the nominal stress ratio and real stress ratio were established using fatigue tests under different loading *** was revealed that the strength of the asphalt mixture is affected by the loading speed *** was also discovered that the fatigue equation based on the nominal stress ratio will change with the change of the fatigue loading *** is no *** the fatigue equation based on the real stress ratio doesn't change with the loading *** has the *** results indicate the fatigue equation based on the real stress ratio can realize the normalization of the asphalt mixture fatigue equation under different loading *** can greatly benefit the analysis of the fatigue characteristics under different vehicle speeds for asphalt pavement.

关键词： road engineering asphalt pavement fatigue equation loading speed loading frequency strength stress ratio

Molecular characterization, expression and function analysis of eukaryotic translation initiation factor(eIF1A) in Mangifera indica

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Journal of Integrative Agriculture 2019年第11期18卷 2505-2513页

作者： LI Li-shu LUO Cong AN Zhen-yu LIU Zhao-liang DONG Long YU Hai-xia HE Xin-hua The State key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources/College of Agriculture Guangxi UniversityNanning 530004P.R.China Cash Crops Research Institute Guangxi Academy of Agricultural SciencesNanning 530007P.R.China Horticulture Research Institute Guangxi Academy of Agricultural SciencesNanning 530007P.R.China

Eukaryotic translation initiation factor 1A(eIF1A)functions as an important regulatory factor of protein synthesis and plays a crucial role in responses to abiotic stresses in ***,little is known about the eIF1A gene involved in fruit development and stress response of *** this study,the MieIF1A-b gene was isolated from Mangifera indica,and contains a 435-bp open reading frame,which encodes a putative protein of 144 amino acids(GenBank accession number:KP676599).The predicted MieIF1A-b protein had a molecular weight of 16.39 kDa with a pI of *** homology analysis showed that MieIF1A-b shared high homology with Elaeis guineensis,Manihot esculenta,and Populus trichocarpa,with 96 and 95%identity,*** reverse transcriptative PCR(qRT-PCR)analyses indicated that MieIF1A-b was expressed in all tested tissues,and had the highest expression level in fruit 80 d after *** expression of MieIF1A-b was obviously regulated by NaCl and H2O2 treatments in *** analysis indicated that the overexpression of MieIF1A-b in transgenic Arabidopsis thaliana enhanced the growth,phenotype and salinity tolerance compared with wild-type(WT)*** results indicated that MieIF1A-b may be correlated with the control of fruit development and salt adaptation,and it was a candidate gene for abiotic stress in mango.

关键词： Mangifera indica MieIF1A-b gene gene clone expression functional analysis

A novel robust AE/MS source location method using optimized M-estimate consensus sample

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International Journal of Mining science and technology 2022年第4期32卷 779-791页

作者： Yichao Rui Zilong Zhou Xin Cai Riyan Lan Congcong Zhao School of Resources and Safety Engineering Central South UniversityChangsha 410083China guangxi Xinfazhan Communication Group Company Limited Nanning 530029China

Due to the complexity of the real engineering environment, the arrival measurement inevitably contains outliers and leads to serious location errors. In order to eliminate the influence of the outliers effectively,this paper proposes a novel robust AE/MS source localization method using optimized M-estimate consensus sample. First, a sample subset is selected from the entire arrival set to obtain fitting model and its parameters. Second, consensus set is determined by checking the arrivals with the fitting model instantiated by the estimated model parameters. Third, optimization process is performed to further optimize the consensus set. The above steps are iterated, and the final source coordinates are obtained by using all the elements in the optimal consensus set. The novel method is validated by a pencil-lead breaks experiment. The results indicate that the novel method has better location accuracy of less than 5 mm compared to existing methods, regardless of the presence or absence of outliers. With the increase of outlier scale and outlier ratio, the location result of the proposed method is always more stable and accurate than that of the existing methods. Mine blasting experiments further demonstrate that the new method holds good prospects for engineering applications.

关键词： Microseismic source Acoustic emission Source localization Outliers Consensus sample