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Flexible Strain Sensors with Ultra‑High Sensitivity and Wide Range Enabled by Crack‑Modulated Electrical Pathways

Nano-Micro Letters 2025年第3期17卷 246-264页

作者： Yunzhao Bai Yunlei Zhou Xuanyu Wu Mengfei Yin Liting Yin Shiyuan Qu Fan Zhang Kan Li YongAn Huang State Key Laboratory of intelligent Manufacturing equipment and Technology Huazhong University of Science and TechnologyWuhan 430074People’s Republic of China Flexible Electronics research center Huazhong University of Science and TechnologyWuhan 430074People’s Republic of China Hangzhou Institute of Technology Xidian UniversityHangzhou 311200People’s Republic of China School of Mechano‑Electronic Engineering Xidian UniversityXi’an 710071People’s Republic of China Department of Aerospace and Mechanical Engineering University of Southern CaliforniaLos AngelesCA 90089USA

This study presents a breakthrough in flexible strain sensor technology with the development of an ultrahigh sensitivity and wide-range sensor,addressing the critical challenge of reconciling sensitivity with measurement *** by the structure of bamboo slips,we introduce a novel approach that utilises liquid metal to modulate the electrical pathways within a cracked platinum fabric *** resulting sensor demonstrates a gauge factor greater than 108 and a strain measurement capability exceeding 100%.The integration of patterned liquid metal enables customisable tuning of the sensor’s response,while the porous fabric structure ensures superior comfort and air permeability for the *** design not only optimises the sensor’s performance but also enhances the electrical stability that is essential for practical *** systematic investigation,we reveal the intrinsic mechanisms governing the sensor’s response,offering valuable insights for the design of wearable strain *** sensor’s exceptional performance across a spectrum of applications,from micro-strain to large-strain detection,highlights its potential for a wide range of real-world uses,demonstrating a significant advancement in the field of flexible electronics.

关键词： Flexible strain sensor Fabric Crack Response regulation Epidermal device

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Droplets movement and deposition of an eight-rotor agricultural UAV in downwash flow field

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International Journal of Agricultural and Biological Engineering 2017年第3期10卷 47-56页

作者： Tang Qing Zhang Ruirui Chen Liping Xu Min Yi Tongchuan Zhang Bin Beijing research center of intelligent equipment for agriculture Beijing Academy of Agriculture and Forestry SciencesBeijing 100097China national research center of intelligent equipment for agriculture Beijing 100097China Beijing Key Laboratory of intelligent equipment Technology for agriculture Beijing 100097China

The movement and deposition of the droplets sprayed by agricultural unmanned aerial vehicle(UAV)are influenced by the complex downwash flow field of the *** of conducting field experiment,a high speed particle image velocimetry(PIV)method was used to measure the movement and deposition of the droplets at different rotating speeds of rotors(1000-3000 r/min)or at different transverse injecting points(20-50 cm away from its nearby rotors)in the downwash flow field of an agricultural UAV with eight rotors and conical *** maximum speed and size of the high speed zone of the droplets were found greatly influenced by the downwash *** initial spray angle of the nozzle declined with the increase of downwash flow *** was found that the downwash velocity could not only change the deposition zone of the droplets,but also influence their *** increase of the downwash velocity would increase the deposition uniformity of the *** nozzle position in the downwash flow field could also influence the deposition of the *** the transverse distance between the nozzle and its nearby rotors increased,the relative deposition near the downwash flow of the rotors increased ***,the distance between the deposition peak and the nozzle stayed *** initial spray angle of the nozzle was not influenced by the transverse distance between the nozzle and its nearby *** research results could provide a theoretical basis and reference for the optimization of the spray application of multi-rotor UAV to minimize droplets deposition uncertainty.

关键词： chemical spray droplet deposition UAV flow field multi-rotor

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Design and evaluation of a maize monitoring system for precision planting

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International Journal of Agricultural and Biological Engineering 2018年第4期11卷 186-192页

作者： Yanxin Yin Liping Chen Zhijun Meng Bin Li Changhai Luo Weiqiang Fu Hebo Mei Wuchang Qin Beijing research center of intelligent equipment for agriculture Beijing Academy of Agriculture and Forestry SciencesBeijing 100089China national research center of intelligent equipment for agriculture Beijing 100089China Beijing Key Laboratory of intelligent equipment Technology for agriculture Beijing 10089China

To increase the accuracy and real-time performance of on-line assessment of maize planting,a CAN bus based maize monitoring system for precision planting was designed and tested both in laboratory and *** system was mainly comprised of:(a)seeding rate sensors based on opposite-type infrared photoelectric cell for counting the dropping seeds;(b)a decimeter GPS receiver for acquiring planter position and operation speed;(c)a vehicle monitoring terminal based on ARM Cotex-m4 core chip to acquire and process the whole-system data;(d)a touchscreen monitor to display the planter performance for the operator;and(e)a buzzer alarm to sound a warning when skip and double seeding *** the applicability,dependability and feasibility of the monitoring system into consideration,the opposite-type infrared photoelectric sensors were selected and their deployment strategies in the 6-port seed tube were *** decrease the average response time,a distributed information communication structure was *** this information communication mode,collectors were designed for each individual sensor and communicated with sensors through two-wire CAN bus.A sensor together with the designed collector is called a sensor node,and each of them worked individually and took the responsibility for acquiring,processing,and transiting the on-going *** test results showed that the random error distribution was approximately normal,and by liner analysis,the system observed value and the true value had as a liner relationship with coefficient of determination R^(2)=*** of field tests showed that the seeding rate maximum relative error of the 6-port seed tube was 2.92%,and the maximum root mean square error(RMSE)was about 1.64%.The monitoring system,including sensor nodes,vehicle monitoring terminal and a touch-screen monitor,was proved to be dependable and stable with more than 14 d of continuous experiments in field.

关键词： maize precision planting monitoring system seeding rate on-line assessment CAN bus

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Design and test of tray-seedling sorting transplanter

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International Journal of Agricultural and Biological Engineering 2015年第2期8卷 14-20页

作者： Feng Qingchun Zhao Chunjiang Jiang Kai Fan Pengfei Wang Xiu Beijing research center of intelligent equipment for agriculture Beijing 100097China

In order to improve the automatic sorting and transplanting of tray-seedling and reduce labors strength,a new sorting transplanter was *** to the feature of normal seedling tray and manual grading method,the mechanical sorting procedure was *** key parts of sorting transplanter are as follows:an efficient transfer mechanism with aerodynamic buffer,a seedling identifying and measuring unit based on linear-structured vision,the extendible multi-grasper with wireless technology and the system *** experiments were conducted and showed that the transplanting success rate was 90.0% on the tray of 6×12 holes under the speed of 700 cycles per *** vision unit’s failed identifying rate for the superior pepper seedlings on five different trays was less than 10%,and the measurement error of seedling height was about 5 mm.

关键词： transplanter tray seedling sorting grasper machine vision wireless technology

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Design and test of robotic harvesting system for cherry tomato

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International Journal of Agricultural and Biological Engineering 2018年第1期11卷 96-100页

作者： Qingchun Feng Wei Zou Pengfei Fan Chunfeng Zhang Xiu Wang Beijing research center of intelligent equipment for agriculture Beijing Academy of Agriculture and Forestry SciencesBeijing 100097China national research center of intelligent equipment for agriculture Beijing 100097China Beijing Key Laboratory of intelligent equipment Technology for agriculture Beijing 100097China

Harvesting of fresh-eating cherry tomato was highly costly on labor and *** order to achieve mechanical harvesting for the fresh-eating tomato,a new harvesting robot was designed,which consisted of a stereo visual unit,an end-effector,manipulator,a fruit collector,and a railed *** robot configuration and workflow design focused on the special cultivating *** key parts were introduced in detail:a railroad vehicle capably moving on both ground and rail was adopted as the robot’s carrier,a visual servo unit was used to identify and locate the mature fruits bunch,and the end-effector to hold and separate the fruit bunch was designed based on the stalk’s mechanical *** field test of the new developed robot was conducted and the results were *** successful harvest rate of the robot was 83%,however,each successful harvest averagely needed 1.4 times attempt,and a single successful harvesting cycle cost 8 s excluding the time cost on moving.

关键词： cherry tomato harvesting robot visual servo configuration design field test

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Shortwave infrared hyperspectral imaging for detection of pH value in Fuji apple

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International Journal of Agricultural and Biological Engineering 2014年第2期7卷 130-137页

作者： Guo Zhiming Huang Wenqian Chen Liping Peng Yankun Wang Xiu Beijing research center of intelligent equipment for agriculture Beijing Academy of Agriculture and Forestry SciencesBeijing 100097China College of Engineering China Agricultural UniversityBeijing 100097China national Engineering research center of intelligent equipment for agriculture Beijing 100097China

pH value is regarded as one of the most important attributes that affect sensory characteristics and edible quality of *** objective of the research was to explore the feasibility of applying shortwave infrared hyperspectral imaging system to detect the pH value of apple.A shortwave infrared hyperspectral imaging system was developed over the wavelength region of 1000-2500 nm and used to acquire hyperspectral images of apple *** reflectance calibration,mean reflectance spectral was calculated by averaging the intensity of all pixels within the roundness region of interest(ROI).Synergy interval partial least squares(siPLS)algorithms as an effective multivariable method was conducted on the calibration of regression model to estimate the pH value in Fuji *** performance of the final model was back-evaluated according to root mean square error of calibration(RMSEC)and correlation coefficient(Rc)in calibration set,and tested in prediction *** optimal prediction siPLS model was obtained with correlation coefficient(Rp)of 0.8474 and mean square error of prediction(RMSEP)of *** results indicated that shortwave infrared hyperspectral imaging combined with siPLS chemometrics could be an accurate and fast method for nondestructive prediction of pH value in Fuji apple.

关键词： shortwave infrared hyperspectral imaging synergy interval partial least squares pH value apple

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Review of the detasseling techniques for maize(Zea mays L.)hybrid seed production

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International Journal of Agricultural and Biological Engineering 2024年第3期17卷 1-11页

作者： Ruirui Zhang Jiaxuan Yang Liping Chen Chenchen Ding Longlong Li Linhuan Zhang national research center of intelligent equipment for agriculture Beijing Academy of Agriculture and Forestry SciencesBeijing 100097China national center of International research on Agricultural Aerial Application Technology Beijing 100097China research center of intelligent equipment Beijing Academy of Agriculture and Forestry SciencesBeijing 100097China

Maize(Zea mays L.)is a critical staple crop globally,integral to human consumption,food security,and agricultural product *** quality and purity of maize seeds,essential for hybrid seed production,are contingent upon effective *** study investigates the evolution of detasseling technologies and their application in Chinese maize hybrid seed production,with a comparative analysis against the United States.A comprehensive examination of the development and utilization of detasseling technology in Chinese maize hybrid seed production was undertaken,with a specific focus on key *** from the United States were included for comparative *** analysis encompassed various detasseling methods,including manual,semi-mechanized,and cytoplasmic male sterility,as well as more recent innovations such as detasseling machines,and the emerging field of intelligent detasseling driven by unmanned aerial vehicles(UAVs),computer vision,and mechanical *** detasseling methods were predominantly employed by *** the challenges of inflexible and occasionally overlooked,applying detasseling machines is efficient and *** present,China’s detasseling operations in hybrid maize seed production are mainly carried out by manual work,which is labor-intensive and *** order to address this issue,China is dedicated to developing intelligent detasseling *** study emphasizes the critical role of detasseling in hybrid maize seed *** United States has embraced mechanized *** application and development of manual and mechanized detasseling were applied later than those in the United States,but latest intelligent detasseling technologies first appeared in *** detasseling is expected to be the future direction,ensuring the quality and efficiency of hybrid maize seed production,with implications for global food security.

关键词： detasseling technique detasseling machine UAVs intelligent agriculture maize hybrid seed production

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Effects of drought stress on photosynthesis and chlorophyll fluorescence images of soybean(Glycine max)seedlings

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International Journal of Agricultural and Biological Engineering 2018年第2期11卷 196-201页

作者： Wensen Wang Cheng Wang Dayu Pan Yakun Zhang Bin Luo Jianwei Ji College of Information and Electrical Engineering Shenyang Agricultural UniversityShenyang 110866China Beijing research center of intelligent equipment for agriculture Beijing 100097China national research center of intelligent equipment for agriculture Beijing 100097China Beijing Key Laboratory of intelligent equipment Technology for agriculture Beijing 100097China

The main purpose of this research is to provide a theoretical foundation for the screening of drought-resistant soybean varieties and to establish an efficient method to detect the PSII actual photochemical quantum yields *** soybean varieties were compared in this experiment after 15 d when they were planted in a *** varieties were then exposed to light drought stress(LD)and serious drought stress(SD)*** five times’measurement,chlorophyll fluorescence and soil-plant analysis development considered as the main basis for this *** parameters in SD conditions significantly reduced,such as net photosynthetic rates(Pn),stomatal conductance(Gs),PSII primary light energy conversion efficiency(Fv/FM),PSII actual photochemical quantum yields[Y(II)],photochemical quenching coefficient(qP)and non-photochemical quenching coefficient(qN).The soybeans in the seedling stage adapted to the inhibitory effect of drought stress on photosynthesis through stomatal *** serious drought stress,non-stomatal limitation damaged the plant photosynthetic *** amplitudes of Pn and Y(II)of drought-resistant Qihuang 35 were lower than those of the two other *** on the data of this study,a new method had been developed to detect Y(II)which reflected the photosynthetic capacity of plant,R=0.85989,u=0.048803 when using multiple linear regression,and R=0.84285,u=0.054739 when using partial least square regression.

关键词： soybean seedling drought stress photosynthetic parameters chlorophyll fluorescence parameters chlorophyll fluorescence images

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Identification of seedling cabbages and weeds using hyperspectral imaging

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International Journal of Agricultural and Biological Engineering 2015年第5期8卷 65-72,I0004页

作者： Deng Wei Yanbo Huang Zhao Chunjiang Wang Xiu Beijing research center of intelligent equipment for agriculture Beijing Academy of Agriculture and Forestry ScienceBeijing 100097China United States Department of agriculture Agricultural Research ServiceCrop Production Systems Research UnitStonevilleMississippiUSA national research center of intelligent equipment for agriculture Beijing 100097China Key Laboratory of Agri-informatics Ministry of AgricultureBeijing 100097China Beijing Key Laboratory of intelligent equipment Technology for agriculture Beijing 100097China

Target detection is one of research focuses for precision chemical *** study developed a method to identify seedling cabbages and weeds using hyperspectral *** processing the image data with ENVI software,after dimension reduction,noise reduction,de-correlation for high-dimensional data,and selection of the region of interest,the SAM(Spectral Angle Mapping)model was built for automatic identification of cabbages and *** the HSI(Hyper Spectral Imaging)Analyzer,the training pixels were used to calculate the average spectrum as the standard *** parameters of the SAM model,which had the best classification results with 3-point smoothing,zero-order derivative,and 6-degrees spectral angle,was determined to achieve the accurate identification of the background,weeds,and *** comparison,the SAM model can completely separate the plants from the soil background but not perfect for weeds to be separated from the *** conclusion,the SAM classification model with the HSI analyzer could completely distinguish weeds from background and cabbages.

关键词： hyperspectral imaging weed identification cabbage seedlings

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Droplet spectra and high-speed wind tunnel evaluation of air induction nozzles

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Frontiers of Agricultural Science and Engineering 2018年第4期5卷 442-454页

作者： Qing TANG Liping CHEN Ruirui ZHANG Min XU Gang XU Tongchuan YI Bin ZHANG Beijing research center of intelligent equipment for agriculture Beijing Academy of Agriculture and Forestry SciencesBeijing 100097China national research center of intelligent equipment for agriculture Beijing 100097China Beijing Key Laboratory of intelligent equipment Technology for agriculture Beijing 100097China

A series of air induction nozzles were tested in a high-speed wind *** size spectra were measured for four air induction nozzles(IDK-120-01,IDK-120-02,IDK-120-03 and IDK-120-04)each at three spray pressures(0.3,0.4 and 0.5 MPa)and seven different air velocities(121.7,153.4,185.5,218.4,253.5,277.5 and 305.5 km·h^(-1)).The measurement distance(0.15,0.25 and0.35 m)from the nozzle orifice was found to be important for the atomization of the *** response surface method was used to analyze the experimental *** results indicated that Dv_(0.1)and Dv_(0.5)of the droplets decreased quasi-linearly with increased wind speed,while Dv_(0.9)was affected by the quadratic of wind ***_(0.1),Dv_(0.5)and Dv_(0.9)of the droplets were all proportional to the orifice size,and were not markedly influenced by the spray *** percentage of the spray volume consisting of droplets with a diameter below 100 mm(%<100 mm)was found to be quadratically related to wind speed,and was not markedly influenced by the spray pressure and orifice ***,the effect of the orifice size on the %<200 mm could not be ignored.

关键词： air induction nozzle wind tunnel aerial spray droplet size spectra

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