基于脑电信号评价情绪状态及听觉激励对改善情绪的研究     

王慧  邱义波  骆永乐 《南京气象学院学报》2019,11(2):158-164

如何从脑活动数据中发现具有生物学意义的知识及规律,正成为当今神经信息学理论与实践研究的热点与难点.基于脑电的情绪识别和情绪及其脑机制的关联研究已经成为神经工程和生物医学工程领域的热门课题.本研究基于脑电信号评价情绪状态,尝试借助脑电耳机来监测"毫无头绪"的脑电波,重点开展了听觉激励对改善焦虑情绪状态的实验研究.借助特定中国古风纯音乐产生听觉信号激励,激发出被试者平静放松的情绪状态,从而改善焦虑,发现音乐和情绪之间可能存在的关系.将来在BCI技术研究的基础之上,情绪识别可以进一步满足患有特定疾病（ALS症、脑瘫、脑干中风、脊髓损伤等）的患者人群的某些更高级的需求,即通过脑电分析出其对事物的喜好度,比如音乐的选择,从而设计出更加友善和智能的BCI系统,在医疗康复领域具有很好的应用前景.  相似文献   

Certainty factors of earthquake precursory anomaly evidences CF(E)     

郑兆苾 《地震学报(英文版)》1994,7(3):475-479

ＣｅｒｔａｉｎｔｙｆａｃｔｏｒｓｏｆｅａｒｔｈｑｕａｋｅｐｒｅｃｕｒｓｏｒｙａｎｏｍａｌｙｅｖｉｄｅｎｃｅｓＣＦ（Ｅ）Ｚｈａｏ－ＢｉＺＨＥＮＧ（郑兆）（ＳｅｉｓｍｏｌｏｇｉｃａｌＢｕｒｅａｕｏｆＡｎｈｕｉＰｒｏｖｉｎｃｅ，Ｈｅｆｅｉ２３００３１，Ｃｈ...  相似文献   

BALLOON-BORNE MEASUREMENTS OF AEROSOL VERTICAL DISTRIBUTIONS OVER BEIJING DURING THE SUMMER AND AUTUMN OF 1993          下载免费PDF全文

Zhou Jun  Tan Kun  Shao Shisheng  Gong Zhiben  Shi Guangyu  Guo Jiandong  Wang Biao  Zhang Baowu  Sun Baolai  Yasunobu Iwasak  Masahiko Hayashi  Masahiro Hase 《Acta Meteorologica Sinica》1994,8(4):478-487

The results of two balloon soundings during the summer and autumn of 1993 from the Xianghe Observation Station are being utilized in a study of the temporal and spatial distribution of the atmospheric aerosols.The balloon,gondola,instrumentation and atmospheric conditions during the observation period are described.The temporal and spatial characteristics of aerosol concentration,size ratio,mixing ratio,and size distribution for both troposphere and strato-sphere are presented and analyzed.  相似文献   

A new theoretical solution of the effect of atmospheric pressure on water level     

Peng-Jun Zhao 《地震学报(英文版)》1995,8(2):317-323

Based on the partial differential equation governing the effect of atmospheric pressure on water level of confined well, deriving the boundary condition and considering the seepage water between well and aquifer, the author obtained the analytical solution of water level change in time domain under the action of an atmospheric pressure history with the Laplace transform method. This solution is composed of two terms:stable and retarded terms. The stable term is the multiplication of barometric efficiency and simultaneous atmospheric pressure, and it implies the value of water level after infinite time when the atmospheric pressure is a constant from the time in question. The retarded term is the transient process due to the time lag of water exchange between well and aquifer. From the solution, it is obtained that the interference of atmospheric pressure on water level is the integral superimposition of the contribution of all atmospheric pressure changes before the time in question. So that, we further found out the response function of pulsive atmospheric pressure history. Calculation shows: (1) The pulsive response function starts from zero and tends to a steady value, which is proportional to the barometric efficiency, when the time tends to infinity; (2) The retarded time depends on the mechanical property of aquifer and the radius of well. The larger the seepage coefficient, the smaller the radius of well and the thicker the aquifer, then the shorter the retarded time gets. This solution can be used as the theoretical basis for further analysis of the atmospheric effect and practical correcting method in the future.  相似文献   

REMOTE SENSING OF THE SEASONAL VARIATION IN COLUMN ABUNDANCE OF ATMOSPHERIC CH₄^*          下载免费PDF全文

WEI Heli  LIU Qinghong  XU Qingshan  ZHAO Fengsheng  SONG Zhengfang 《Acta Meteorologica Sinica》2001,15(2):249-256

Infrared solar spectra on clear days were measured automatically by an infrared solar spectrometer(ISS) with 0.4 cm^-1 resolution developed by us.A line-by line(LBL) computation method was used to calculate theoretical atmospheric absorption.In the wavelength range of 3.410-3.438 μm.the absorption is mainly due to atmospheric methane and water vapor.Columnatmospheric methane was retrieved from the recorded infrared solar spectra.The seasonal variation of column atmospheric methane in Hefei has been obtained from the measuremental data of nearly 18 months since the April of 1997.and found that it is similar to that of background data.The instruments.principles of measurement and some of results were introduced,and the results are also discussed briefly in the paper.  相似文献   

VARIABILITY OF AEROSOL OPTICAL PROPERTIES OVER HEFEI DURING SEPTEMBER 1993 TO SEPTEMBER 1994   总被引：7，自引：0，他引：7       下载免费PDF全文

Zhou Jun  Wang Zhi''en  Han Jiecai  Hu Huanling  Li Guojie 《Acta Meteorologica Sinica》1996,10(1):81-95

An 8-wavelength sun-photometer has been operated at Hefei (31.31°N, 117.17°E) to monitoroptical properties of atmospheric aerosols. Altogether 133 solar spectral extinction data were ob-tained on clear days during the period from September 1993 through September 1994, In this pa-per, the feature of the sun-photometer is briefly described. A relative aureole method is intro-duced. which can be used to monitor temporal evolution of aerosol loading during the sun-pho-tometer calibration period. Temporal variabilities of spectral aerosol optical depths and Angstromturbidity parameters are presented. Relation of these variabilities with synoptic and local meteoro-logical conditions are analyzed and discussed, From measured spectral aerosol optical depths undersome representative atmospheric conditions, columnar aerosol size distributions have been retrievedby a linearly constrained inversion method. These typical columnar aerosol size distributions are al-so presented and discussed.  相似文献   

高分辨率光学遥感卫星反射点源像点提取方法     

徐伟伟  张黎明  李鑫  杨宝云 《测绘学报》1957,49(10):1295-1302

像点提取精度是高分辨光学遥感卫星几何定标精度的关键因素之一。本文提出一种基于轻小型、自动化反射点源的像点提取方法,以参数化高斯模型拟合获取点源影像的像点坐标。在轨试验结果初步表明,反射点源法所提取的像点坐标的共线误差小于0.001像素,比例常量的相对标准偏差优于5‰,与质心法等常用方法提取的点源像点坐标相比较,精度优于0.05像素。反射点源不仅能够实现高精度的像点提取,而且还能够实现高分辨率光学遥感卫星的高精度几何定标与像质评价,对提高我国航天遥感立体测绘精度具有重要意义。  相似文献   

前向散射式能见度仪测试方法研究     

王敏  方海涛  张世国  汪玮  王毛翠  褚进华  方欣 《气象科技》2021,49(1):12-17

针对气象行业前向散射式能见度仪检测标准缺失现状,开展了前向散射式能见度仪室内测试方法研究。文中介绍了前向散射式能见度仪的工作原理,阐述了测量标准设备的组成和技术要求,详细论述了前向散射式能见度仪的测试项目和测试方法,展示了多台前向散射式能见度仪室内实测结果。研究表明:利用试验舱模拟能见度进行测量范围和示值误差测试具有可行性,测量标准器可选择透射仪;响应时间可通过放置散射板或遮光板产生突变信号完成测试。  相似文献   

自研透射式能见度测量系统性能分析     

汪玮  张世国  章超  方海涛  王敏 《气象科技》2020,48(2):163-170

从系统测量原理、组成结构、计算过程及测量效果等方面介绍了一种自行研制的透射式能见度测量系统。该系统使用白色LED光源,实现发散角为1mrad的平行光路;利用积分球进行分光监控以补偿光能量变化;使用非球面镜实现全光斑接收。系统与积分浊度计在2～10km量程内能见度测试误差小于10%。从透射式能见度测量原理与计算过程,分析了影响系统测量性能的因素。结果显示定标准确性、测量线性度与系统稳定性是影响系统测量性能的主要因素,同时给出了该系统的定标准确性、测量线性度与系统稳定性的评估方法及评估数据,验证了该系统的测量性能。  相似文献   

郯庐断裂带安徽段现代地震活动及应力场特征   总被引：7，自引：6，他引：7       下载免费PDF全文

刘东旺  夏瑞良  刘泽民  沈小七  李敏莉  闫素萍 《地质科学》2006,41(2):278-290

分析了郯庐断裂带安徽段地震活动特征,利用近震直达波最大振幅比方法反演了99次中-小地震震源机制,并作了统计和聚类分析。现代地震活动整体上继承了历史地震分布格局,未显示增强趋势;断裂带及邻区应力场P轴和T轴优势方位大致呈近东西向和近南北向分布,现今承受的作用力以近水平或斜向为主,但也存在部分其它方向的应力场和近垂直方向的作用力。震源断层的破裂类型,带内以逆冲(或正断),或近逆冲(或正断)型为主。带附近较明显地呈现出走滑型或近走滑型破裂的优势;北、南亚段应力场有明显差异,即北压南张,其分界大约在北纬32°附近,北西西走向的桥头集—东关断裂是两者间的构造变换带。  相似文献