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MXene-composited highly stretchable,sensitive and durable hydrogel for flexible strain sensors

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Chinese Chemical Letters 2021年第6期32卷 2021-2026页

作者： Wei Yuan Xinyu Qu Yao Lu Wen Zhao Yanfang Ren Qian Wang Wenjun Wang Xiaochen Dong Key Laboratory of Flexible Electronics(KLOFE)&Institute of Advanced Materials(IAM) School of Physical and Mathematical SciencesNanjing Tech University(NanjingTech)Nanjing 211800China school of Physical {1. and Information technology Liaocheng UniversityLiaocheng 252059China school of Chemistry and Materials {1. Nanjing University of Information Science&TechnologyNanjing 210044 China

The flourishing development in flexible electronics has provoked intensive research in flexible strain sensors to realize accurate perception acquisition under different external ***,building hydrogel-based strain sensors with high stretchability and sensitivity remains a great ***,MXene nanosheets were composited into polyacrylamide-sodium alginate matrix to construct mechanical robust and sensitive double networked hydrogel strain *** hydrophilic MXene nanosheets formed strong interactions with the polymer matrix and endowed the hydrogel with excellent tensile properties(31.0%),compliant mechanical strength(2.03 kPa^(-1.in Young’s Module)and long-lasting stability and fatigue resistance(1.00 dynamic cycles under 1.600%strain).Due to the highly oriented MXene-based three dimensional conductive networks,the hydrogel sensor achieved extremely high tensile sensitivity(1..1. in gauge factor)and compression sensitivity(0.38 kPa^(-1.below 3 kPa).MXene hydrogel-based strain sensors also displayed negligible hysteresis in electromechanical performance,typical frequent-independent feature and rapid response time to external ***,the sensor exhibited accurate response to different scales of human movements,providing potential application in speech recognition,expression recognition and handwriting verification.

关键词： Hydrogel MXene Strain sensor High stretchablity and sensitivity Durability

Theoretical study on homoleptic mononuclear and binuclear ruthenium carbonyls Ru(CO)_n(n=3―5) and Ru_2(CO)_n(n=8,9)

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science China Chemistry 2009年第11期52卷 1938-1944页

作者： PENG Bin1.GU FengLong1.ZHANG XiuHui2,LUO Qiong2 & LI QianShu1.2 1.school of Chemistry and Environment,South China Normal University,Guangzhou 51.631.China 2 Beijing Institute of {1.,Beijing 1.0081.China 1. school of Chemistry and Environment South China Normal University Guangzhou 510631 China 2. Beijing Institute of technology Beijing 100081 China

Homoleptic mononuclear and binuclear ruthenium carbonyls Ru(CO)n(n=3―5) and Ru2(CO)n(n=8,9) have been investigated using density functional *** isomers are *** Ru(CO)5,the lowest-energy structure is the singlet D3h trigonal *** to Os(CO)5,the distorted square pyramid isomer with C2v symmetry lies ～7 kJ·mol-1.higher in *** the unsaturated mononuclear ruthenium carbonyls Ru(CO)4 and Ru(CO)3,a singlet structure with C2v symmetry and a Cs bent Tshaped structure are the lowest-energy structures,*** global minimum for the Ru2(CO)9 is a singly bridged(CO)4Ru(μ-CO)Ru(CO)4 structure.A triply bridged Ru2(CO)6(μ-CO)3 structure analogous to the known Fe2(CO)9 structure is predicted to lie very close in energy to the global *** Ru2(CO)8,the doubly bridged C2 structure is predicted to be the global *** the lowest-energy structures of M2(CO)n(M=Fe,Ru,Os,n=9,8),it is found that both iron and ruthenium are favored to form structures containing more bridging carbonyl groups,while osmium prefers to have structures with less bridging carbonyl *** study of dissociation energy shows that the dissociation of Ru2(CO)9 into the mononuclear fragments Ru(CO)5+Ru(CO)4 is a less energetically demanding process than the dissociation of one carbonyl group from Ru2(CO)9 to give Ru2(CO)8.

关键词： dinuclear ruthenium carbonyls DFT theoretical study

Hot deformation characterization and processing map of Cu-1. %Fe-1.5 %Ag in situ composite

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Rare Metals 2017年第11期36卷 912-918页

作者： Jun-Qing Guo He Yang Ping Liu Zhi-Wei Cai State Key Laboratory of Solidification Processing Northwestern Polytechnical University school of Materials {1. and Engineering University of Shanghai for Science and Technology school of Materials {1. and Engineering University of Henan Science and Technology

The Cu-1. %Fe-1.5 %Ag in situ composite with high strength, high conductivity and low cost was prepared, and its hot deformation behavior was investi- gated by isothermal compression test with true strain of 0.69, temperature range of 750-950℃ and strain rate of 0.002-1.000 s-1. The flow stress-strain response shows the characterization of dynamic recrystallization （DRX）, and the peak stress increases gradually with deformation tem- perature decreasing and strain rate increasing. The defor- mation activation energy of the composite for DRX is calculated as 241.864 ***1.1. The constitutive relation of the composite was got by Arrhenius equation. Further- more, according to the dynamic material modeling and Kumar-Prasad＇s instability criteria, the processing map was constructed and the unsafe regions for hot deformation were analyzed. Based on the processing map and microstructural evolution, the optimal parameter range for hot deformation processing is 750-863℃ at the strain rate of 0.002-0.01. s-1.

关键词： Cu-1. %Fe-1.5 %Ag in situ composite Hotcompression test Deformation characterization Processingmap Dynamic recrystallization

Intense supercontinuum generation in the near-ultraviolet range from a 400-nm femtosecond laser filament array in fused silica

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Chinese Physics B 2017年第7期26卷 149-152页

作者：李东伟张兰芝 Saba Zafar 宋鹤郝作强奚婷婷高勋林景全 school of {1. Changchun University of {1. and technology school of Physics University of Chinese Academy of {1.s

An intense supercontinuum（SC） in the near-ultraviolet range is generated from filamentation by focusing a 400-nm laser into fused silica with a microlens array（MLA）. The spectrum of the SC is shown to be sensitive to the distance between the MLA and fused silica. In our optimal conditions, the near-ultraviolet SC can cover a range of 350-600 nm,where a bandwidth of approximately 55 nm above the 1.J/nm spectral energy density and 20 nm bandwidth with tens ofμJ/nm are achieved. In addition, the energy conversion efficiency of the 400 nm laser for SC generation is further analyzed.A maximum conversion efficiency of 66% is obtained when the entrance face of fused silica is set around the focus of the MLA.

关键词： filamentation supercontinuum generation microlens array fused silica

Solving second-order nonlinear evolution partial differential equations using deep learning

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Communications in Theoretical Physics 2020年第10期72卷 42-52页

作者： JUN Li Yong Chen Shanghai Key Laboratory of Trustworthy computing East China Normal UniversityShanghai200062China school of {1. sciences Shanghai Key Laboratory of PMMPShanghai Key Laboratory of Trustworthy ComputingEast China Normal UniversityShanghai200062China College of Mathematics and Systems science Shandong University of Science and TechnologyQingdao266590China Department of Physics Zhejiang Normal UniversityJinhua321004China

Solving nonlinear evolution partial differential equations has been a longstanding computational *** this paper,we present a universal paradigm of learning the system and extracting patterns from data generated from ***,this framework approximates the latent solution with a deep neural network,which is trained with the constraint of underlying physical laws usually expressed by some *** particular,we test the effectiveness of the approach for the Burgers'equation used as an example of second-order nonlinear evolution equations under different initial and boundary *** results also indicate that for soliton solutions,the model training costs significantly less time than other initial conditions.

关键词： deep learning nonlinear evolution equations data-driven solutions solitons nonlinear dynamics

Study on purification technology of polyacrylamide wastewater by non-thermal plasma

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Plasma science and {1. 2019年第5期21卷 66-72页

作者： Junfeng RONG Kaixun ZHU Minggong CHEN school of Chemical Engineering Anhui University of Science and Technology

In this work, non-thermal plasma has been applied to treat polyacrylamide（PAM） *** have investigated the influence of the rule of PAM wastewater initial pH, solution concentration and discharge time, discharge voltage on chemical oxygen demand（COD）degradation rate. At the same time, the effect of pH and discharge time on the viscosity removal rate of PAM solution was also studied. Then, the effect of pH on the viscosity removal rate of1.0 gl-1.PAM solution was studied separately. Through orthogonal test, the factors affecting the COD degradation rate of PAM wastewater were determined as follows: discharge time > discharge voltage > solution concentration > wastewater initial pH. The COD highest removal rate of PAM wastewater reached 85.74%, when the optimal conditions are as follows:discharge voltage 40 k V, discharge time 5 h, solution concentration 1.0 gl-1. pH 1.5. This research provides some basic data and new theoretical basis for PAM wastewater purification.

关键词： non-thermal plasma polyacrylamide COD degradation rate viscosity removal rate discharge voltage

Determining the planting year of navel orange trees in mountainous and hilly areas of southern China:a remote sensing based method

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Journal of Mountain science 2024年第10期21卷 3293-3305页

作者： LEI Juncheng WANG Sha WANG Yuandong LUO Wei school of Geography and Environmental Engineering Gannan Normal UniversityGanzhou 341000China school of Chemistry and Chemical Engineering Gannan Normal UniversityGanzhou 341000China

Remote sensing has demonstrated validity in determining the planting year of deciduous fruit trees;however,its effectiveness in ascertaining the planting year of evergreen fruit trees remains ***,the sources of error associated with using remote sensing to determine the planting year of fruit trees remain *** study investigates several cultivated sweet orange(Citrus sinensis)varieties,which are extensively cultivated throughout subtropical *** analyzed Landsat time series data from 1.2 navel orange orchards in Gannan,covering the period from 1.93 to *** each orchard,Google Earth Engine was employed to extract three vegetation indices—Enhanced Vegetation Index(EVI),Normalized Difference Vegetation Index(NDVI),and Normalized Burn Ratio(NBR)—for each available date,thereby generating three distinct vegetation index time *** planting year of navel orange trees was identified based on abrupt changes observed in these time *** principal sources of error in determining the planting year were investigated using the Wilcoxon signed-rank test,Spearman's correlation analysis,and Kruskal-Wallis H *** findings include:(1.Following the planting of navel orange trees,EVI,NDVI,and NBR exhibited fluctuations and a gradual increase over time,peaking approximately 1. to 1. years later.(2)The vegetation index time series derived from Landsat imagery effectively determined the planting year of evergreen navel orange trees in orchards,even within highly fragmented *** these indices,NDVI and NBR time series outperformed the EVI time ***,the average determination errors for EVI,NDVI,and NBR time series were 6.4,1.8,and 2.8 years,respectively.(3)Major sources of error included the methods used to construct the time series,the selection of vegetation indices,and the orchard management ***,this study provides a viable method for determining the planting year of evergreen navel orange trees in f

关键词： Time series Remote sensing Google Earth Engine Gannan Subtropics

Semisolid A356 alloy feedstock poured through a serpentine channel

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International Journal of Minerals,Metallurgy and Materials 2009年第5期16卷 603-607页

作者： Xiao-rong Yang Wei-min Mao Chong Gao school of Materials {1. and Engineering University of Science and Technology Beijing Beijing 100083 China school of Materials {1. and Engineering Taiyuan University of Science and Technology Taiyuan 030024 China

Fine spheroidal and equiaxed nondendritic microstructures required for semisolid casting can be formed through a serpentine pouting channel. Effects of the pouring temperature and the vertical section length of the serpentine pouring channel were studied. The results indicate that both favorable semisolid microstructures of A356 aluminum alloy can be generated by a serpentine pouring channel, and the solid shell inside the channel can be avoided when the pouting temperature is in the range from 660 to 680℃. It is also shown that the vertical section length of the serpentine pouting channel has a significant influence on the microstructure of the feedstock, namely both the microstructure of the feedstock and the microstructure uniformity in the radial direction get worse when the vertical section length is shortened; moreover, the pouring temperature for obtaining the feedstock with suitable microstructure decreases. The relevant mechanisms were discussed.

关键词： semisolid microstructure serpentine channel primary α-A1

The influence of mechanical loading on osseointegration:an animal study

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science China(Life sciences) 2009年第6期52卷 579-586页

作者： FAN YuBo1.XIU KaiHua1.DONG Xiang2 & ZHANG Ming2 1.school of Biological {1. and Medical Engineering,Beihang University,Beijing 1.0083,China 2 Department of Health technology and Informatics,The Hong Kong Polytechnic University,Hong Kong,China 1. school of Biological {1. and Medical Engineering Beihang University Beijing 100083 China 2. Department of Health technology and Informatics The Hong Kong Polytechnic University Hong Kong China

Osseointegration of implant provides a stable support for the prosthesis under functional *** timing of loading is a critical parameter that can govern the success of the osseointegration of ***,it is not clear whether the early loading can affect the success of osseointegration,or whether the no-loading healing period can be *** paper presents an animal study conducted to investigate how external loads influence the osseointegration at the initial stage of *** implants were inserted into the goat tibia laterally,and different axial loadings were applied to the im-plants in 4 weeks after *** the 2 weeks period of early loading,animals were sacrificed and the tibia bones with the implants were cut off from the *** mechanical test was employed to find out the differences in the pull-out force,and shear strength at the bone-implant interface between the non-loaded and the loaded *** implant-bone interfaces were analyzed by histomor-phometric method,SEM(scanning electron micrograph) and EDS(energy density spectrum).The re-sults indicated that the bone-implant interface did not well integrate 4 weeks after surgery,and the fi-brous tissue could be found at the interfaces of the specimens without *** the results of loaded specimens with 1. N axial force showed that that parts of the interface were well integrated,indicating that the early mild loading may play a positive role in the process of the *** results support that a certain range of external loading would influence the process of osseointe-gration,and appropriate mechanical loading can be applied to shorten the osseointegration period after surgery.

关键词： Osseointegration implant animal model histology pull-out test