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A Printable and Conductive Yield-Stress Fluid as an Ultrastretchable Transparent Conductor

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Research 2021年第1期2021卷 1554-1564页

作者： Qianying Lu yunlei Zhou Xiangfei Yin Shitai cao Xiaoliang Wang Desheng Kong College of Engineering and Applied Sciences State Key Laboratory of Analytical Chemistry for Life Scienceand Jiangsu Key Laboratory of Artificial Functional MaterialsNanjing UniversityNanjing 210046China Key Laboratory of High Performance Polymer Materials and Technology of Ministry of Education Department of Polymer Science and EngineeringSchool of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210046China

In contrast to ionically conductive liquids and gels,a new type of yield-stress fluid featuring reversible transitions between solid and liquid states is introduced in this study as a printable,ultrastretchable,and transparent *** fluid is formulated by dispersing silica nanoparticles into the concentrated aqueous *** as-printed features show solid-state appearances to allow facile encapsulation with *** transition into liquid-like behavior upon tensile deformations is the enabler for ultrahigh stretchability up to the fracture strain of the *** integrations of yield-stress fluid electrodes in highly stretchable strain sensors and light-emitting devices illustrate the practical *** yield-stress fluid represents an attractive building block for stretchable electronic devices and systems in terms of giant deformability,high ionic conductivity,excellent optical transmittance,and compatibility with various elastomers.

关键词： attractive electrolyte reversible

Vibration coupling effects and machining behavior of ultrasonic vibration plate device for creep-feed grinding of Inconel 718 nickel-based superalloy

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Chinese Journal of Aeronautics 2022年第2期35卷 332-345页

作者： Yang cao Yejun ZHU Wenfeng DING yutong QIU Lifeng WANG Jiuhua XU National Key Laboratory of Science and Technology on Helicopter Transmission Nanjing University of Aeronautics and AstronauticsNanjing 210016China College of Engineering Nanjing Agricultural UniversityNanjing 210032China College of Aerospace Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China

Ultrasonic vibration-assisted grinding(UVAG)is an effective and promising method for machining of hard-to-cut *** article proposed an ultrasonic vibration plate device enabling the longitudinal full-wave and transverse half-wave(L2T1)vibration mode for *** characteristics of two-dimensional coupled vibration in different directions were analyzed on the basis of apparent elastic method and finite element ***,a correction factor was applied to correct the frequency error caused by the apparent elastic ***,the comparative experiments between the conventional creep-feed grinding and UVAG of Inconel 718 nickel-based superalloy were carried *** results indicate that the apparent elastic method with the correction factor is accurate for the design of plate device under the L2T1 vibration *** with the conventional creep-feed grinding,the UVAG causes the reduction of grinding force and the improvement of machined surface quality of Inconel 718 nickel-based ***,under the current experimental conditions,the optimal ultrasonic vibration amplitude is determined as 6μm,with which the minimum surface roughness is achieved.

关键词： Apparent elastic method Machining behavior Ultrasonic vibration-assisted grinding Ultrasonic vibration plate device Vibration coupling effects

Spatial transformation of general sampling-aliasing frequency region for rotating-blade parameter identification with emphasis on single-probe blade tip-timing measurement

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Chinese Journal of Aeronautics 2023年第3期36卷 220-240页

作者： Jiahui cao Zhibo YANG Guangrong TENG Shaohua TIAN Guoyong YE Xuefeng CHEN School of Mechanical Engineering Xi’an Jiaotong UniversityXi’an 710049China Sichuan Gas Turbine Establishment Aero Engine Corporation of China Mianyang 621000China College of Mechanical and Electrical Engineering Zhengzhou University of Light IndustryZhengzhou 450002China

Blade-health monitoring is intensely required for turbomachinery because of the high failure risk of rotating ***-Tip Timing(BTT)is considered as the most promising technique for operational blade-vibration monitoring,which obtains the parameters that characterize the blade condition from recorded ***,its application is hindered by severe undersampling and stringent probe *** inappropriate probe layout can make most of the existing methods invalid or ***,a general conflict arises between the allowed and required layouts because of arrangement *** the sake of economy and safety,parameter identification based on fewer probes has been preferred by *** this work,a spatial-transformation-based method for parameter identification is proposed based on a single-probe BTT *** present the general Sampling-Aliasing Frequency(SAFE)map definition,the traditional time-frequency analysis methods are extended to a time-sampling ***,a SAFE map is projected onto a parameter space using spatial transformation to extract the slope and intercept parameters,which can be physically interpreted as an engine order and a natural frequency using coordinate ***,the effectiveness and robustness of the proposed method are verified by simulations and experiments under uniformly and nonuniformly variable speed conditions.

关键词： Blade-tip timing(BTT) Extended time-frequency analysis Image-feature recognition Parameter extraction Sampling-aliasing frequency map Spatial transformation Vibration analysis

Kinetics model for leaching of ion-adsorption type rare earth ores

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Journal of Rare Earths 2020年第12期38卷 1354-1360页

作者： Ping Long Guanshi Wang Chao Zhang Yaojie Yang Xiaojing cao Zibo Shi School of Resources and Environmental Engineering Jiangxi University of Science and TechnologyGanzhou 341000China Cooperative Innovation Center of Efficient Development and Application for Ionic Rare Earth Resources Jiangxi University of Science and TechnologyGanzhou 341000China School of Architectural and Surveying and Mapping Engineering Jiangxi University of Science and TechnologyGanzhou 341000China

This paper aims to establish a mathematical model that can analyze the whole leaching kinetics process of ion-adsorption type rare earth *** leaching process is composed of three steps:(1)ammonium ions arrive at the ore particle surface through the diffusion layer;(2)ammonium ions exchange with rare earth ions;and(3)rare earth ions enter into the external solution through the diffusion *** the leaching process,it is hypothesized that the ore particle size remains constant The process of ammonium ions and rare earth ions passing through the diffusion layer was described by the Fick law,and the reversible ion exchange process between ammonium ions and rare earth ions was described by the Kerr model,A leaching kinetics model of rare earth ions by ammonium ions was *** of this kinetics model was verified with laboratory *** is found that the correlation coefficients of all data are greater than *** proposed kinetics model is therefore feasible for kinetics analysis throughout the leaching process.

关键词： Rare earth Leaching Kinetics Ion exchange

Microstructural evolution and deformation behavior of copper alloy during rheoforging process

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Journal of Materials Science & Technology 2020年第7期42卷 17-27页

作者： Miao cao Qi Zhang Ke Huang Xinjian Wang Botao Chang Lei Cai School of Mechanical Engineering Xi’an Jiaotong UniversityXi’an710049China Zhejiang Dunan Artificial Environment Co. Ltd.Hangzhou310053China School of Science Xi’an Jiaotong UniversityXi’an710049China

A complete rheo-forming process was carried out to investigate the rheoforging process of C3771 lead brass valve,starting from the semi-solid billet preparation to rheoforging experiments and material performance *** near-spherical micro-grains with mean equivalent diameter of 56.3μm,shape factor of 0.78 were obtained when the raw C3771 lead brass were rotary swaged to a radial strain of0.22 and then heated to 895℃for 5 *** Forge 3 D software was used to analyze the temperature,strain and strain rate distribution of copper valve for obtain the reasonable process parameters during the subsequent rheoforging *** experiment results showed that near-spherical micro-grains were stretched and refined to about 35.7-43.4μm in different positions due to the dynamic recrystallization during the rheoforging *** cap thread and nut thread failure torque of the so-produced valve are also discovered to be higher than the traditionally forged copper valve with dendrite micro-grains,with an enhancement of the cap and thread failure torque of 42.2%and 28%,re s pectively.

关键词： Semi-solid Microstructural evolution Dynamic recrystallization Mechanical properties

Pedestrian wind flow prediction using spatial-frequency generative adversarial network

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Building Simulation 2024年第2期17卷 319-334页

作者： Pengyue Wang Maozu Guo Yingeng cao Shimeng Hao Xiaoping Zhou Lingling Zhao School of Architecture and Urban Planning Beijing University of Civil Engineering and ArchitectureBeijing100044China Beijing Key Laboratory of Intelligent Processing for Building Big Data Beijing100044China School of Electrical and Information Engineering Beijing University of Civil Engineering and ArchitectureBeijing100044China School of Computer Science and Technology Harbin Institute of TechnologyHarbin150001China

Pedestrian wind flow is a critical factor in designing livable residential environments under growing complex urban *** pedestrian wind flow during the early design stages is essential but currently suffers from inefficiencies in numerical *** learning,particularly generative adversarial networks(GAN),has been increasingly adopted as an alternative method to provide efficient prediction of pedestrian wind ***,existing GAN-based wind flow prediction schemes have limitations due to the lack of considering the spatial and frequency characteristics of wind flow *** study proposes a novel approach termed SFGAN,which embeds spatial and frequency characteristics to enhance pedestrian wind flow *** the spatial domain,Gaussian blur is employed to decompose wind flow into components containing wind speed and distinguished flow edges,which are used as the embedded spatial *** information of wind flow is obtained through discrete wavelet transformation and used as the embedded frequency *** spatial and frequency characteristics of wind flow are jointly utilized to enforce consistency between the predicted wind flow and ground truth during the training phase,thereby leading to enhanced *** results demonstrate that SFGAN clearly improves wind flow prediction,reducing Wind_MAE,Wind_RMSE and the Fréchet Inception Distance(FID)score by 5.35%,6.52%and 12.30%,compared to the previous best method,*** also analyze the effectiveness of incorporating the spatial and frequency characteristics of wind flow in predicting pedestrian wind *** reduces errors in predicting wind flow at large error intervals and performs well in wake regions and regions surrounding *** enhanced predictions provide a better understanding of performance variability,bringing insights at the early design stage to improve pedestrian wind *** proposed spatial-frequen

关键词： pedestrian wind flow prediction generative adversarial network Gaussian kernel wavelet transform objective function

A criterion for flow mechanisms through vertical sharp-edged orifice and model for the orifice discharge coefficient

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Petroleum Science 2011年第1期8卷 108-113页

作者： cao Rui Liu Yansheng Yan Chaoyu State Key Laboratory of Heavy Oil Processing China University of PetroleumBeijing 102249China

According to the experimental data of the orifice discharge coefficient for the flow through a vertical sharp-edged orifice obtained in the previous study of this work,a theoretical criterion for flow mechanisms of small orifice（***-walled orifice and nozzle） and large orifice（***-walled orifice） was proposed based on the ratio of orifice diameter to plate *** can help explain the dissipation of the mechanical energy loss in the flow process for the two flow mechanisms under different operating *** main parameters such as orifice diameter,plate thickness and liquid head were correlated,and a semi-empirical model for orifice coefficient and an empirical model with high precision at the stable region were developed.

关键词： Orifice discharge coefficient theoretical criterion model ratio of orifice diameter to plate thickness Reynolds number liquid head

Coupled DEM-FDM analyses of the effects of falling rock’s shape and impact angle on response of granular cushion and rock shed

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第8期16卷 3353-3364页

作者： Jingyu Xue Chen cao Jianhua Yan Yaopeng Ji Jianping Chen College of Construction Engineering Jilin UniversityChangchun130026China School of Earth Sciences and Engineering Hohai UniversityNanjing210098China

Rock shed is an effective protection measure against *** investigate the influences of falling rock’s shape and impact angle on the impact effect of the cushioned rock shed,a modeling approach for a rock shed with a cushion layer using *** granular cushion is modeled as an aggregate of discrete non-cohesion particles,while the concrete plate and the beam are modeled as *** falling rock with different sphericities and impact angles is modeled as a rigid *** numerical model is validated by comparing the simulation results with experimental and numerical results from previous *** model is applied to analyze the effects of rock shape and impact angle on the dynamic interaction effects between falling rock and cushioned rock shed,including the impact force,transmitted bottom force,penetration depth,and plate *** numerical results show that the variation in the falling rock’s shape has different effects on the falling rock with different impact *** findings could support rock shed design by revealing the limitations of the assumptions in the past research,which may result in unsafe rock sheds for some rockfall cases.

关键词： Rockfall Coupled DEM-FDM analysis Rock’s shape Impact angle Granular cushion Rock shed

Distribution Characteristics of Transmitted Diffuse Solar Radiation on the Indoor Surface

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Journal of Thermal Science 2022年第6期31卷 1939-1947页

作者： YAO Wanxiang TIAN Wanfeng SHANG Jiacheng HE Haiyan DONG Jiajun cao Weixue School of Energy and Safety Engineering Tianjin Chengjian UniversityTianjin 300384China Tianjin Key Laboratory of Civil Structure Protection and Reinforcement Tianjin Chengjian UniversityTianjin 300384China Key Laboratory of Solar Energy Utilization and Energy Saving Technology of Zhejiang Province Zhejiang Energy Group R&D Institute Co.Ltd.Hangzhou 311121China

The transparent envelope structure has huge energy-saving potential, which is the key point to reduce building energy consumption and improve the thermal building environment. The solar radiation transmitted through the transparent envelope structure(transmitted solar radiation) is reflected, scattered and absorbed by the indoor surface, which has a significant impact on the heat gain of the building. In this paper, firstly, the diffuse radiation received by different depths of various indoor surfaces is measured by experimental tests, and the distribution function of transmitted diffuse solar radiation(TDSR) on the indoor surface is established. Secondly, the diffuse solar radiation received by the indoor and outdoor surfaces in different seasons is continuously monitored;the variation of TDSR with time is analyzed, and the distribution function of TDSR on indoor surface with time is proposed. Finally, based on the temporal and spatial distribution characteristics of diffuse radiation under different weather conditions, the variation of TDSR with the weather is studied, and the distribution function of TDSR on the indoor surface with weather changes is established. The distribution function of the TDSR on the indoor surface under different depths, time and weather conditions obtained in this study can supplement and improve the theory of building heat gain and load, and help accurate simulation of building energy consumption.

关键词： transmitted solar radiation diffuse radiation indoor wall surface distribution characteristics building heat gain