中国科学院机构知识库网格系统: 检索

A Revised Hilbert-Huang Transformation to Track Non-Stationary Association of Electroencephalography Signals 期刊论文 OAI收割
IEEE TRANSACTIONS ON NEURAL SYSTEMS AND REHABILITATION ENGINEERING, 2021, 卷号: 29, 页码: 841-851
作者: Shan, Xiaocai; Huo, Shoudong; Yang, Lichao; Cao, Jun; Zou, Jiaru

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收藏 | 浏览/下载：36/0 | 提交时间：2021/10/19

Electroencephalography Time-frequency analysis Transforms Wavelet transforms Oscillators Signal resolution Physiology EEG transient connectivity cross-spectrum Hilbert Huang transform

Simple and fast spectral domain algorithm for quantitative phase imaging of living cells with digital holographic microscopy 会议论文 OAI收割
conference on three-dimensional and multidimensional microscopy - image acquisition and processing xxiv, san francisco, ca, 2017-01-30
作者: Min, Junwei; Yao, Baoli; Ketelhut, Steffi; Kemper, Bjoern

收藏 | 浏览/下载：97/0 | 提交时间：2017/09/07

Digital holographic microscopy aberration compensation frequency spectrum analysis quantitative phase imaging quantitative live cell analysis

Three-dimensional numerical study of the acoustic properities of a highly underexpanded jet 会议论文 OAI收割
20th AIAA International Space Planes and Hypersonic Systems and Technologies Conference, 2015, Glasgow, United kingdom, July 6, 2015 - July 9, 2015
作者: Wu K(吴坤); Li XP(李晓鹏); Yao W(姚卫); Fan XJ(范学军)

收藏 | 浏览/下载：35/0 | 提交时间：2017/05/05

Frequency spectrum analysis High temporal resolution Instantaneous flow Noise generation mechanisms Theoretical modeling Three dimensional numerical studies Transport mechanism Under expanded jets

Numerical and experimental investigation on the stability of slopes threatened by earthquakes 期刊论文 OAI收割
ARABIAN JOURNAL OF GEOSCIENCES, 2015, 卷号: 8, 期号: 7, 页码: 4353-4364
作者: Jiao, Yu-Yong; Tian, Hu-Nan; Wu, Huo-Zhen; Li, Hai-Bo; Tang, Hui-Ming

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收藏 | 浏览/下载：21/0 | 提交时间：2018/06/05

Earthquake-induced landslide Resonance modal analysis Wenchuan earthquake Spectrum characteristics Intrinsic frequency

A Method to Automatic Detecting Coronal Mass Ejections in Coronagraph Based on Frequency Spectrum Analysis 会议论文 OAI收割
International Conference of Modern Computer Science and Applications (MCSA 2012), Wuhan, PEOPLES R CHINA, 2012-09-08
作者: Zeng Zhao-xian; Wei Ya-li; Liu Jin-sheng

收藏 | 浏览/下载：24/0 | 提交时间：2015/10/26

Coronal mass ejection Automatic detection frequency spectrum analysis

Evaluation of equivalent medium methods for stress wave propagation in jointed rock mass 期刊论文 OAI收割
INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS, 2013, 卷号: 37, 期号: 7, 页码: 701-715
作者: Ma, G. W.; Fan, L. F.; Li, J. C.

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收藏 | 浏览/下载：23/0 | 提交时间：2018/06/05

equivalent medium method jointed rock mass wave attenuation effective velocity frequency spectrum analysis

Phase-locked and non-phase-locked event-related oscillations and channel power spectra analysis during motor imagery with speed parameters for BCRI 会议论文 OAI收割
5th International Conference on Bioinformatics and Biomedical Engineering, iCBBE 2011, Wuhan, China, May 10-12, 2011
作者: Fu YF(伏云发); Xu BL(徐保磊); Pei LL(裴立力); Li HY(李洪谊)

收藏 | 浏览/下载：32/0 | 提交时间：2012/06/06

Bioinformatics Biomedical engineering Feature extraction Frequency bands Investments Power spectrum Robots Time domain analysis Wavelet transforms

Correction method for detection of the frequencies of railway fsk signals (EI CONFERENCE) 会议论文 OAI收割
2008 9th International Conference on Signal Processing, ICSP 2008, October 26, 2008 - October 29, 2008, Beijing, China
作者: Yu J.

收藏 | 浏览/下载：63/0 | 提交时间：2013/03/25

In order to acquire the information of railway binary frequency-shift keying signals which include upper/down side frequencies and base low-frequency with high-accuracy a novel frequency detection algorithm for France UM-71 system is proposed. Combining fast Fourier transform with the ratio correction method the carrier frequency and the base frequency are obtained. Furthermore the hardware consumption has been decreased. And it possesses the advantage of simple algorithm and fast operation speed. Comparing with the detection of the base frequency the upper/down side frequency of railway signal is more difficult. Based on spectrum analysis and the spectrum correction a new method which adopts the sliding window is put forward in this paper. The absolute differences between the upper side frequencies and the down side frequencies obtained are regarded as the criterion for judgment. Then the set of data in which the maximum absolute value is is to be the result of the upper/down side frequency. Because the sliding window will go through every stage when the upper/down side frequency changes therefore it is not sensitive enough to the position of data which need to be transformed. Using the method mentioned above the experiment results show that the accuracy requirement of the side frequency is satisfied well. 2008 IEEE.

A high-accuracy parameter estimation algorithm for jointless Frequency-shift track circuit (EI CONFERENCE) 会议论文 OAI收割
ISECS International Colloquium on Computing, Communication, Control, and Management, CCCM 2008, August 3, 2008 - August 4, 2008, Guangzhou, China
作者: Zheng X.

收藏 | 浏览/下载：24/0 | 提交时间：2013/03/25

FSK (Frequency Shift keying) signal which has advantages of narrow-bandwidth strong anti-interference ability long transmission distance and so on is used in jointless Frequency-shift track circuit to send different kinds of control signals. However as FSK is non-linearly modulated parameter estimation with high accuracy is hard to realize. Based on the spectrum analysis complement with time-frequency distribution a highaccuracy FSK signal parameter estimation algorithm is put forward in this paper. According to the signal characteristics under-sampling and ZFFT are used to improve the accuracy of spectrum analysis and the base frequency resolution meets system requirement of 0.02Hz. Wigner-Ville distribution has an excellent time-frequency concentration while serious cross-term interference at the same time. Through the design of kernel function the cross-terms are almost suppressed and the upper/down side frequency resolution meets the system requirement of 0.2Hz. The effectivities of all the methods mentioned above have been proved by MATLAB simulation which pave a solid way for the development of high-accuracy FSK signal parameter estimation devices. 2008 IEEE.

Design of high-resolution fourier transform lens (EI CONFERENCE) 会议论文 OAI收割
3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies, AOMATT 2007: Advanced Optical Manufacturing Technologies, July 8, 2007 - July 12, 2007, Chengdu, China
作者: Zhang L.; Zhang L.

收藏 | 浏览/下载：24/0 | 提交时间：2013/03/25

With the development of optical information processing high-resolution Fourier transform lens has often been used in holographic data storage system spatial filtering and observation of particles. This paper studies the optical design method of high-resolution Fourier transform optical lenses system which could be used in particles observation and holographic data storage system. According to Fourier transform relation between object and its frequency plane and the theory of geometrical optics the system with working wavelength 532nm and resolution 3 m was designed based on ZEMAX. A multi-configuration method was adopted to optimize the system's lenses. In the optical system a diaphragm was placed at the system's spectrum plane and the system demanded a low vacuum to cut down the influences of atmosphere and other particles. The result of finite element analysis indicated that the influences of vacuum pumping to optics spacing and mirror surface shape very minor and the imaging quality not being affected. This system has many advantages such as simple structure good image quality and a high resolution of 3 m. So it has a wide application prospect and can be used both in holographic data storage system and particles observation.