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Robust,self-adhesive,and low-contact impedance polyvinyl alcohol/polyacrylamide dual-network hydrogel semidry electrode for biopotential signal acquisition

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SmartMat 2024年第2期5卷 67-82页

作者： Guangli Li Ying Liu Yuwei Chen yonghui xia xiaoman Qi Xuan Wan Yuan Jin Jun Liu Quanguo He Kanghua Li Jianxin Tang Hunan Key Laboratory of Biomedical Nanomaterials and Devices College of Life Sciences and ChemistryHunan University of TechnologyZhuzhouChina Department of Neurology Zhuzhou People's HospitalZhuzhouChina Zhuzhou Institute for Food and Drug Control ZhuzhouChina

Herein,we fabricated a flexible semidry electrode with excellent mechanical performance,satisfactory self-adhesiveness,and low-contact impedance using physical/chemical crosslinked polyvinyl alcohol/polyacrylamide dual-network hydrogels(PVA/PAM DNHs)as an efficient saline *** resultant PVA/PAM DNHs showed admirable adhesive and compliance to the hairy scalp,facilitating the establishment of a robust electrode/skin interface for biopotential signal ***,the PVA/PAM DNHs steadily released trace saline onto the scalp to achieve the minimized potential drift(1.47±0.39 mV/min)and low electrode–scalp impedance(18.2±8.9 kΩ@10 Hz).More importantly,the application feasibility of real-world brain−computer interfaces(BCIs)was preliminarily validated by 10 participants using two classic BCI *** mean temporal cross-correlation coefficients between the semidry and wet electrodes in the eyes open/closed and the N200 speller paradigms are 0.919±0.054 and 0.912±0.050,*** electrodes demonstrate anticipated neuroelectrophysiological responses with similar *** semidry electrode could also effectively capture robust P-QRS-T peaks during electrocardiogram *** their outstanding advantages of fast setup,user-friendliness,and robust signals,the proposed PVA/PAM DNH-based electrode is a promising alternative to wet electrodes in biopotential signal acquisition.

关键词： brain-computer interface dual-network hydrogel electrocardiogram signals electroencephalography signals semidry electrode

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DELAY DIFFERENTIAL EQUATIONS UNDER NONLINEAR IMPULSIVE CONTROL AND APPLICATIONS TO NEURAL NETWORK MODELS

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Journal of Systems Science & Complexity 2012年第4期25卷 707-719页

作者： Yong ZHAO Qishao LU Zhaosheng FENG yonghui xia Department of Dynamics and Control Beihang University Department of Mathematics University of Texas-Pan AmericanEdinburgTX 78539USA Department of Mathematics Zhejiang Normal University

In this paper, a class of delay differential equations with nonlinear impulsive control is discussed. Based on the nonsmooth analysis, criteria of stability are obtained for delay differential equations with nonlinear impulses control under certain conditions. These criteria can be applied to some neural network models. At the end of the paper, two examples are provided to illustrate the feasibility and effectiveness of the proposed results.

关键词： stability. Delay differential equation homeomorphism impulsive control nonsmooth analysis

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Chiral phase diagram of strongly interacting matter at finite volume

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Science China(Physics,Mechanics & Astronomy) 2018年第8期61卷 93-96页

作者： Chao Shi yonghui xia WenBao Jia HongShi Zong Department of Physics Nanjing University College of Materials Science and Engineering Nanjing University of Aeronautics and Astronautics Key Laboratory of Theoretical Physics Institute of Theoretical Physics Chinese Academy Sciences Joint Center for Particle Nuclear Physics and Cosmology

At extremely high temperature T～200 Me V and low chemical potentialμ,the quarks and gluons get released from the nucleon and form the quark-gluon plasma(QGP)state,which is accessible in the heavy ion collisions(HIC)globally[1,2].Theoretically,ab initio lattice QCD simulation found the transition from hadrons to QGP at lowμis continuous crossover instead of phase *** this connection,RHIC is running the beam energy scan program to look into the territory with higherμ[3].One important goal is to determine if there is the first order phase transition as expected by many model studies and locate the critical end point(CEP)if it exists.

关键词：有限体积物质交往 initio 阶段转变重离子碰撞 RHIC 扫描程序

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In Vivo Study on Degradation Behavior and Histologic Response of Pure Magnesium in Muscles

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Journal of Materials Science & Technology 2017年第5期33卷 469-474页

作者： Shanshan Chen Lili Tan Bingchun Zhang yonghui xia Ke Xu Ke Yang Institute of Metal Research Chinese Academy of Sciences Department of Radiology The First Affiliated Hospital of China Medical University Key Laboratory of Diagnostic Imaging and Interventional RadiologyLiaoning Province

When an orthopedics device is implanted into bone injury site, it will contact the soft tissue （skeletal muscle, fascia, ligament etc.） except for bone. Magnesium based biodegradable metals are becoming an important research object in orthopedics due to their bioactivity to promote bone healing. In this study, pure Mg rods with and without chemical conversion coating were implanted into the muscle tissue of rabbits. Implants and their surrounding tissues were taken out for weight loss measurement, cross- sectional scanning electron microscopy observation, elemental distribution analysis and histological examination. The results showed that the chemical conversion coating would increase the in vivo cor- rosion resistance of pure Mg and decrease the accumulation of calcium （Ca） and phosphorus （P） elements around the implants. For the bare magnesium implant, both Ca and P contents in the surrounding tissues increased at the initial stage of implantation and then decreased at 12 weeks implantation, while for the magnesium with chemical conversion coating, Ca and P contents in the surrounding tissues de- creased with the implantation time, but were not significant. The histological results demonstrated that there was no calcification in the muscle tissue with implantation of magnesium for up to 12 weeks. The chemical conversion coating not only increased the in vivo corrosion resistance of pure Mg, but also avoided the depositions of Ca and P in the surrounding tissues, meaning that pure magnesium should be biosafe when contacting with muscle tissues,

关键词： Pure magnesium Degradation behavior Histologic response Muscle tissue

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Finite volume effects on the QCD chiral phase transition in the finite size de-pendent Nambu-Jona-Lasinio model

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Chinese Physics C 2019年第3期43卷 43-48页

作者： yonghui xia Qingwu Wang Hongtao Feng Hongshi Zong Department of physics Nanjing UniversityNanjing 210093China Department of physics Sichuan UniversityChengdu 610064China School of physics Southeast UniversityNanjing 210093China Joint Center for Particle Nuclear Physics and CosmologyNanjing 210093China

The effective Lagrangian of a finite volume system should, in principle, depend on the system size. In the framework of the Nambu-Jona-Lasinio(NJL) model, by considering the influence of quark feedback on the effective coupling, we obtain a modified NJL model so that its Lagrangian depends on the volume. Based on the modified NJL model, we study the influence of finite volume on the chiral phase transition at finite temperature, and find that the pseudo-critical temperature of crossover is much lower than that obtained in the normal NJL model. This clearly shows that the volume dependent effective Lagrangian plays an important role in the chiral phase transitions at finite temperature.

关键词： chiral phase transition NJL model finite volume effect

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EXISTENCE OF POSITIVE PERIODIC SOLUTION OF A DISCRETE TIME MUTUALISM SYSTEM WITH DELAYS

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Annals of Differential Equations 2006年第2期22卷 225-233页

作者： Zhang Huiying xia yonghui College of Math. and Computer Science Fuzhou University Fuzhou 350002

Discrete-time analogue of mutualism model is introduced. The discrete-time analogues is considered to be numerical discretization of the continuous-time models and we study their dynamical characteristics. It is shown... 详细信息

关键词： discrete-time analogues periodic solutions coincidence degree mutualism model

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EXISTENCE OF POSITIVE PERIODIC SOLUTION OF MUTUALISM SYSTEM WITH INFINITE DELAYS

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Annals of Differential Equations 2005年第3期21卷 448-453页

作者： xia yonghui Lin Muren College of Math. and Computer Science Fuzhou University Fuzhou 350002

In this paper, by using Mawhin coincidence degree, some sufficient conditions are obtained for the global existence of positive periodic solution of a mutualism system with infinite delays. Our results generalize thos... 详细信息

关键词： periodic solutions coincidence degree mutualism model

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PERSISTENCE AND STABILITY OF A DISCRETE PERIODIC PREDATOR-PREY MODEL

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Annals of Differential Equations 2007年第4期23卷 530-535页

作者： Xu Rongcong xia yonghui College of Math. and Computer Science Fuzhou University Fuzhou 350002

In this paper, we investigate the persistence and global asymptotic stability of a discrete predator-prey system. Based on Lyapunov functions, several criteria are established concerning the persistence and globally a... 详细信息

关键词： persistence difference equation Lotka-Volterra systems asymptotical stability

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多层透镜状致密砂岩气田井网优化技术对策

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天然气地球科学 2022年第11期33卷 1883-1894页

作者：郭智王国亭夏勇辉杨勃韩江晨中国石油勘探开发研究院北京100083 中国石油长庆油田分公司气田开发事业部陕西西安710018

苏里格致密砂岩气田储层物性差、垂向上发育多层透镜状有效砂体、规模小、非均质性强,现有井网对储层控制不足,采收率偏低。井网优化调整是致密气提高储量动用程度及采收率的最有效手段之一。根据储层结构及气井生产开发效果,将气田可... 详细信息

苏里格致密砂岩气田储层物性差、垂向上发育多层透镜状有效砂体、规模小、非均质性强,现有井网对储层控制不足,采收率偏低。井网优化调整是致密气提高储量动用程度及采收率的最有效手段之一。根据储层结构及气井生产开发效果,将气田可效益动用储层划分为3种类型,分别对应储量丰度为:>1.8×10^(8)m^(3)/km^(2)、(1.3~1.8)×10^(8)m^(3)/km^(2)、(1.0~1.3)×10^(8)m^(3)/km^(2)。基于不同储层条件下的密井网试验区实际生产数据,结合储层规模分析和气井泄气范围评价,兼顾开发效益和提高采收率,从采收率增幅拐点、区块整体有效、新井能够自保等方面开展适宜井网密度综合分析,明确了3类储层的适宜井网密度分别为3口/km^(2)、4口/km^(2)、4口/km^(2)。苏里格致密砂岩气田剩余可动储量1.23×10^(12)m^(3),新的差异化布井方式相比于600 m×800 m井网,可多钻井1.2万口,多建产能450×10^(8)m^(3),累计多产气2 000×10^(8)m^(3),可将采收率由32%提升至48.5%。

关键词：致密砂岩气苏里格气田多层透镜状储层分类井网优化

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建筑企业绿色施工工程实践与分析

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建筑科技 2022年第5期6卷 62-65页

作者：夏永辉上海建工五建集团有限公司上海200063

建筑施工对资源浪费、环境污染产生巨大负面影响,节能减排是建筑企业义不容辞的社会责任.通过绿色施工,实现资源节约型、环境友好型的建筑工地是必然趋势.结合上海建工五建集团绿色施工开展情况,从绿色施工的内涵、评价体系、管理体系... 详细信息

建筑施工对资源浪费、环境污染产生巨大负面影响,节能减排是建筑企业义不容辞的社会责任.通过绿色施工,实现资源节约型、环境友好型的建筑工地是必然趋势.结合上海建工五建集团绿色施工开展情况,从绿色施工的内涵、评价体系、管理体系、主要措施、效益分析等方面进行剖析,为建筑企业开展绿色施工提供一定的参考与借鉴.

关键词：绿色施工管理体系评价体系效益

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