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Application of Brain-Computer-Interface in Awareness Detection Using Machine Learning Methods

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China Communications 2022年第6期19卷 279-291页

作者： kaiqiang feng Weilong Lin feng Wu Chengxin Pang Liang Song Yijia Wu Rong Cao Huiliang Shang Xinhua Zeng Academy for Engineering and Technology Fudan UniversityShanghai 200433China School of Information Science and Technology Fudan UniversityShanghai 200433China Department of Cardiology Yueyang Hospital of Integrated Traditional Chinese and Western MedicineShanghai 200437China Electronics and Information Engineering Shanghai University of Electric PowerShanghai 200090China

The awareness detection in patients with disorders of consciousness currently relies on behavioral observations and CRS-R tests,however,the misdiagnosis rates have been relatively *** this study,we applied brain-computer interface(BCI)to awareness detection with a passive auditory stimulation paradigm.12 subjects with normal hearing were invited to collect electroencephalogram(EEG)based on a BCI communication system,in which EEG signals are transmitted *** necessary preprocessing,RBF-SVM and EEGNet were used for algorithm realization and *** a single subject,RBF-SVM can distinguish his(her)name stimuli awareness with classification accuracies ranging from 60-95%.EEGNet was used to learn all subjects'data and improved accuracy to 78.04%for characteristics finding and model ***,we completed the supplementary analysis work from the time domain and time-frequency *** study applied BCI communication to human awareness detection,proposed a passive auditory paradigm,and proved the effectiveness,which could be an inspiration for brain,mental or physical diseases diagnosis and detection.

关键词： brain-computer interface EEG awareness detection machine learning deep learning

直线加速器机房超厚大体积混凝土温度裂缝控制技术

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建筑施工 2024年第2期46卷 180-182页

作者：陈少军郑巍李明月冯凯强徐胜中国建筑第八工程局有限公司上海200122

直线加速器机房的主屏蔽墙厚度达3.2m,顶板厚度达1.8m,超厚混凝土结构防辐射性能要求高,为控制直线加速器机房大体积混凝土温度裂缝,提出了原材料选取、配合比优化、混凝土浇筑和振捣等混凝土硬化前控制措施,浇筑前在超厚墙体和楼板结... 详细信息

直线加速器机房的主屏蔽墙厚度达3.2m,顶板厚度达1.8m,超厚混凝土结构防辐射性能要求高,为控制直线加速器机房大体积混凝土温度裂缝,提出了原材料选取、配合比优化、混凝土浇筑和振捣等混凝土硬化前控制措施,浇筑前在超厚墙体和楼板结构内预先安装了温度监测系统和冷却水循环降温管网,冷却水循环降温管网的水循环阀门与温度监测系统的报警模块通过基站网络进行连接,智能控制循环管网内冷却水流动和冷却水温度。基于实时温度监测结果,采用冷却水智能循环管网系统对硬化后混凝土进行智能化控温,解决了混凝土中心部位温度和内外温差过大问题,有效保证了超厚大体积混凝土防辐射性能要求。

关键词：直线加速器机房超厚大体积混凝土温度裂缝

Enhanced electrochemical oxidation of perfluorooctanoic acid on Ti/SnO_(2)-Sb electrode by surface morphology regulation

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Chinese Chemical Letters 2024年第3期35卷 140-143页

作者： kaiqiang Hou Genwang Zhu Yujie feng Yanming Liu Xie Quan Key Laboratory of Industrial Ecology and Environmental Engineering(Ministry of Education China)School of Environmental Science and TechnologyDalian University of TechnologyDalian 116024China State Key Laboratory of Urban Water Resource and Environment School of EnvironmentHarbin Institute of TechnologyHarbin 150090China

Electrochemical oxidation is an effective method to degrade persistent organic ***,due to the limited catalytic activity of traditional thin film electrodes,the anodic oxidation process is slow and usually requires high energy ***,Ti/SnO_(2)-Sb electrode with regulated surface structure was reported to enhance the performance for electrochemical oxidation of persistent organic *** electrode deposited with SnO_(2)-Sb nanoneedles(Ti/N-SnO_(2)-Sb)showed higher oxidation *** kinetic constant for perfluorooctanoic acid(PFOA)oxidation was 2.0 h^(-1)and the total organic carbon removal rate was 81.7%(4 h)at a relatively low current density of 6 mA/cm^*** with Ti/SnO_(2)-Sb thin film and nanoparticles,Ti/N-SnO_(2)-Sb significantly improved the electrochemical active area and·OH yield,and simultaneously reduced the electron transfer resistance,which enabled it to oxidize PFOA more rapidly even at a lower *** work provides a new strategy for promoting the electrochemical oxidation performance.

关键词： Electrochemical oxidation Nanoneedle SnO_(2)-Sb Perfluoroalkyl compounds Electrochemical degradation Persistent organic pollutants

Study of the spatial growth of stimulated Brillouin scattering in a gas-filled hohlraum via detecting the driven ion acoustic wave

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Matter and Radiation at Extremes 2024年第2期9卷 36-49页

作者： Chaoxin Chen Tao Gong Zhichao Li Liang Hao Yonggang Liu Xiangming Liu Hang Zhao Yaoyuan Liu kaiqiang Pan Qi Li Sanwei Li Zhijun Li Sai Jin feng Wang Dong Yang Laser Fusion Research Center China Academy of Engineering PhysicsMianyangSichuan 621900People’s Republic of China Institute of Applied Physics and Computational Mathematics Beijing 100094People’s Republic of China

In an experiment performed on the Shenguang-III prototype laser facility, collective Thomson scattering (TS) is used to study the spatialgrowth of stimulated Brillouin scattering (SBS) in a gas-filled hohlraum by detecting the SBS-driven ion acoustic wave. High-quality timeresolved SBS and TS spectra are obtained simultaneously in the experiment, and these are analyzed by a steady-state code based on theray-tracing model. The analysis indicates that ion–ion collisions may play an important role in suppressing SBS growth in the Au plasma;as aresult, the SBS excited in the filled gas region is dominant. In the early phase of the laser pulse, SBS originates primarily from the high-densityplasma at the edges of the interaction beam channel, which is piled up by the heating of the interaction beam. Throughout the duration of thelaser pulse, the presence of the TS probe beam might mitigate SBS by perturbing the density distribution around the region overlapping withthe interaction beam.

关键词： scattering filled Brillouin

Ultrafast dynamics of femtosecond laser-induced high spatial frequency periodic structures on silicon surfaces

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Opto-Electronic Science 2024年第3期3卷 33-46页

作者： Ruozhong Han Yuchan Zhang Qilin Jiang Long Chen kaiqiang Cao Shian Zhang Donghai feng Zhenrong Sun Tianqing Jia State Key Laboratory of Precision Spectroscopy School of Physics and Electronic ScienceEast China Normal UniversityShanghai 200241China Institute of Laser Manufacturing Henan Academy of SciencesZhengzhou 450046China Institute of Physics Chinese Acadamy of SciencesBeijing 100190China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China

Femtosecond laser-induced periodic surface structures(LIPSS)have been extensively studied over the past few *** particular,the period and groove width of high-spatial-frequency LIPSS(HSFL)is much smaller than the diffraction limit,making it a useful method for efficient ***,compared with the low-spatial-frequency LIPSS(LSFL),the structure size of the HSFL is smaller,and it is more easily ***,the formation mechanism of HSFL is complex and has always been a research hotspot in this *** this study,regular LSFL with a period of 760 nm was fabricated in advance on a silicon surface with two-beam interference using an 800 nm,50 fs femtosecond *** ultrafast dynamics of HSFL formation on the silicon surface of prefabricated LSFL under single femtosecond laser pulse irradiation were observed and analyzed for the first time using collinear pump-probe imaging *** general,the evolution of the surface structure undergoes five sequential stages:the LSFL begins to split,becomes uniform HSFL,degenerates into an irregular LSFL,undergoes secondary splitting into a weakly uniform HSFL,and evolves into an irregular LSFL or is *** results indicate that the local enhancement of the submerged nanocavity,or the nanoplasma,in the prefabricated LSFL ridge led to the splitting of the LSFL,and the thermodynamic effect drove the homogenization of the splitting LSFL,which evolved into HSFL.

关键词： laser-induced periodic surface structures(LIPSS) local field enhancement collinear pump-probe imaging silicon high spatial frequency periodic structures

含正交矩形腔MIM波导电磁感应透明及慢光效应的数值研究

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半导体光电 2019年第2期40卷 200-205页

作者：冯凯强关建飞南京邮电大学电子与光学工程学院微电子学院南京210023

通过在金属-电介质-金属(MIM)波导单侧引入正交的双谐振腔结构,得到了实现等离激元诱导透明效应的结构模型。采用有限元法计算得到了该结构的透射谱曲线。仿真结果显示,波导系统的谐振波长随着正交双谐振腔有效谐振长度(Leff)的增加而红... 详细信息

通过在金属-电介质-金属(MIM)波导单侧引入正交的双谐振腔结构,得到了实现等离激元诱导透明效应的结构模型。采用有限元法计算得到了该结构的透射谱曲线。仿真结果显示,波导系统的谐振波长随着正交双谐振腔有效谐振长度(Leff)的增加而红移,且当正交矩形腔为对称的T形结构时,会出现传输禁带。在此基础上讨论了当正交矩形腔为非对称结构时,在传输禁带处产生类电磁诱导透明峰的物理条件,以及该透射峰的变换规律。类电磁诱导效应可改变光的群速度,从而产生慢光效应。研究结果表明,含正交矩形腔MIM的波导结构可以得到0.086ps的最大光时延,为光路延时以及光数据存储提供了理论参考。

关键词： MIM波导表面等离激元电磁诱导透明

A novel method for AFRPs burrs removal:Principle of mechanochemo-induced fiber fracture

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Chinese Journal of Aeronautics 2024年第7期37卷 522-538页

作者： Jie XU Bo LI Pingfa feng Qiang WANG feng feng Division of Advanced Manufacturing Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055China Department of Mechanical Engineering Tsinghua UniversityBeijing 100084China Changhe Aircraft Industry(Group)Co.Ltd Jingdezhen 333000China

Burrs generated during the machining of Aramid-Fiber-Reinforced Composites(AFRPs)pose a challenge for the production efficiency of aircraft and helicopter housing *** studies have generally attempted to suppress burrs by referring to delamination suppression *** contrast to stratification,burrs are remediable machining *** such,a mechanochemical method with burrs trimming technological strategy are implemented to effectively combat ***,we clarify the mechanism by which aramid fibers cannot be cut off using analytical and numerical *** addition,the mechanism of fiber fracture with Modified Polyurethane Reactive Polymer(M-PUR),and development of anti-burr devices(thermostatic adhesive sealed generator)are ***,the experimental results show that the reduction rate in burr length is 87%-91%through the mechanochemical *** method not only opens a new avenue to solve the burr problem of aramid fibers but also builds an interdisciplinary bridge between polymer science and composite machining.

关键词： Mechanochemical method Burrs Orthogonal cutting Aramid fiber-reinforced composites Milling

一种弹载三轴加速度计现场快速标定及补偿方法

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兵器装备工程学报 2019年第4期40卷 186-189,201页

作者：冯凯强李杰魏晓凯中北大学仪器科学与动态测试教育部重点实验室太原030051

提出了一种基于椭球拟合原理的三轴加速度计在线标定补偿方法,在分析加速度计误差产生机理的基础上,建立三轴加速度计误差模型,根据椭球拟合原理实现了对三轴加速度计的测试标定,并给出了与之对应的标定及补偿方案。试验结果表明:该标... 详细信息

提出了一种基于椭球拟合原理的三轴加速度计在线标定补偿方法,在分析加速度计误差产生机理的基础上,建立三轴加速度计误差模型,根据椭球拟合原理实现了对三轴加速度计的测试标定,并给出了与之对应的标定及补偿方案。试验结果表明:该标定方法能够在较短时间内准确估计三轴加速度计的各项标定参数;标定过程简单,环境要求较低,可在缺少精密标定设备环境下(如靶场)进行;其标定精度与转台标定结果精度相当,补偿精度满足实际数据解算要求。

关键词：三轴加速度计现场标定误差建模椭球拟合标定补偿标定参数

Record-high efficiency perovskite LEDs achieved by accelerating radiative recombination

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Science China Materials 2024年第9期67卷 3039-3040页

作者： feng Gao Department of Physics Chemistry and BiologyLinköping UniversityLinköping58183Sweden

Light-emitting diodes(LEDs)have revolutionized the lighting and displays due to their superior energy *** increasing demand for more efficient and brighter thin-film LEDs in flat-panel displays and solid-state lighting applications has driven extensive research into perovskite materials,which show great promise for high brightness and efficiency.

关键词： lighting radiative high

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