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| 1 | High‑Performance Flexible Microneedle Array as a Low‑Impedance Surface Biopotential Dry Electrode for Wearable Electrophysiological Recording and Polysomnography显示文摘Microneedle array(MNA)electrodes are an effective solution to achieve high-quality surface biopotential recording without the coordination of conductive gel and are thus very suitable for long-term wearable applications.Existing schemes are limited by flexibility,biosafety,and manufacturing costs,which create large barriers for wider applications.Here,we present a novel flexible MNA electrode that can simultaneously achieve flexibility of the substrate to fit a curved body surface,robustness of microneedles to penetrate the skin without fracture,and a simplified process to allow mass production.The compatibility with wearable wireless systems and the short preparation time of the electrodes significantly improves the comfort and convenience of electrophysiological recording.The normalized electrode–skin contact impedance reaches 0.98 kΩcm^(2)at 1 kHz and 1.50 kΩcm^(2)at 10 Hz,a record low value compared to previous reports and approximately 1/250 of the standard electrodes.The morphology,biosafety,and electrical/mechanical properties are fully characterized,and wearable recordings with a high signal-to-noise ratio and low motion artifacts are realized.The first reported clinical study of microneedle electrodes for surface electrophysiological monitoring was conducted in tens of healthy and sleep-disordered subjects with 44 nights of recording(over 8 h per night),providing substantial evidence that the electrodes can be leveraged to substitute for clinical standard electrodes. | Junshi Li Yundong Ma Dong Huang Zhongyan Wang Zhitong Zhang Yingjie Ren Mengyue Hong Yufeng Chen Tingyu Li Xiaoyi Shi Lu Cao Jiayan Zhang Bingli Jiao Junhua Liu Hongqiang Sun Zhihong Li | 2022 | Nano-Micro Letters2022，14，8： | 1 |
| 2 | Airtight negative pressure dust-control technology and application of transpcrsite in the coal conveyer belt system 显示文摘 | Ma Yundong Jia Huiyan Zhang Darning | 2008 | Journal of coal science & engineering2008，，14： | 1 |
| 3 | Airtight negative pressure dust-control technology and application of transpersite in the coal conveyer belt system显示文摘 | Ma Yundong Jia Huiyan Zhang Darning | 2008 | Joumal of Coal Science & Engineering2008，，14： | 1 |
| 4 | Study on vegetation succession rules of mining wasteland in s:ni-add areas显示文摘 | Zhang Xiaowci Ma Yundong | 2008 | Energy and Environment2008，，2： | 1 |
| 5 | Airtight negative pressure dust-control technology and application of transvestite in the coal conveyer belt system显示文摘 | MA YUNDONG JIA HUIYAN ZHANG DAMING | 2008 | Journal of coal science&engineering2008，，4： | 1 |
| 6 | Research on Three-phase PV Grid- Connected Inverter Based on LCL Filter显示文摘 | Yin Wenjiao Ma Yundong | 2013 | Industrial Electron- ics and Applications (ICIEA)2013，，： | 1 |
| 7 | Fatigue test loading methodfor wagon body basedon measured load显示文摘Purpose–In this paper,the C80 special coal gondola car was taken as the subject,and the load test data of the car body at the center plate,side bearing and coupler measured on the dedicated line were broken down to generate the random load component spectrums of the car body under five working conditions,namely expansion,bouncing,rolling,torsion and pitching according to the typical motion attitude of the car body.Design/methodology/approach–On the basis of processing the measured load data,the random load component spectrums were equivalently converted into sinusoidal load component spectrums for bench test based on the principle of pseudo-damage equivalence of load.Relying on the fatigue and vibration test bench of the whole railway wagon,by taking each sinusoidal load component spectrum as the simulation target,the time waveform replication(TWR)iteration technology was adopted to create the drive signal of each loading actuator required for the fatigue test of car body on the bench,and the drive signal was corrected based on the equivalence principle of measured stress fatigue damage to obtain the fatigue test loads of car body under various typical working conditions.Findings–The fatigue test results on the test bench were substantially close to the measured test results on the line.According to the results,the relative error between the fatigue damage of the car body on the test bench and the measured damage on the line was within the range of16.03%–27.14%.Originality/value–The bench test results basically reproduced the fatigue damage of the key parts of the car body on the line. | Qiang Zhang Xiaofeng Li Yundong Ma | 2023 | Railway Sciences2023，2，1： | 0 |
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