POD Spectrum of the Wake behind a Circular Cylinder [PDF]
MATEC Web of Conferences, 2020 The wake dynamics behind a long circular cylinder in cross-flow was studied using the POD method. The temporal parts of POD modes, Chronoses, are subjected to frequency analysis. Five groups of modes are distinguished according to the frequency contents.
Uruba Václav, Procházka Pavel
doaj +1 more source
Quantitative analysis method of electromagnetic spectrum parameter leakage risk in fleet [PDF]
Zhihui kongzhi yu fangzhenIn order to prevent the leakage of electromagnetic spectrum parameters of frequency equipment used by fleet effectively and ensure the safety of frequency usage, a quantitative analysis method of electromagnetic spectrum parameter leakage risk based on ...
WANG Di, ZHAO Luda, LUO Sheng, WANG Lei
doaj +1 more source
Spectrum Analysis Attack Method of Physical Layer Encryption Algorithm [PDF]
Jisuanji gongcheng, 2018 Most of the existing physical layer encryption algorithms setting and security analysis are carried out on baseband,ignoring the threat of spectrum leakage to the security of the algorithm.On the basis of analyzing the spectrum characteristics of ...
GAO Baojian,HU Yun,HU Li’na
doaj +1 more source
Chaos in large-amplitude pulsators: application to the beta Cep star HD180642
, 2013 The CoRoT observations of the beta Cephei star HD180642 uncover an unexpectedly rich frequency spectrum, in addition to several heat-driven modes. So far, two processes have been proposed to explain this behaviour: the presence of stochastic oscillations,
Degroote, Pieter
core +1 more source
A correlation noise spectrometer for flicker noise measurement in graphene samples [PDF]
, 2019 We present a high-resolution digital correlation spectrum analyzer for the measurement of low frequency resistance fluctuations in graphene samples. The system exploits the cross-correlation method to reject the amplifiers' noise.
Callegaro, Luca +3 more
core +3 more sources
Channel Capacity Analysis of Spread Spectrum Watermarking in Radio Frequency Signals
IEEE Access, 2017 The carrier of the digital watermark expands from audio signals to radio frequency (RF) signals. Unlike audio signals, RF signals, such as the watermark transmission carrier, must be correctly demodulated with the watermark signals so that the distortion
Xu Xie, Zhengguang Xu, Hui Xie
doaj +1 more source
Optimization analysis of time frequency spectrum enhancement of tunnel blasting vibration signal
矿业科学学报, 2023 Aiming at the problem of insufficient time-frequency resolution of tunnel blasting vibration signal, a time-frequency image enhancement algorithm based on convolutional neural network is applied, through the time-frequency image enhancement of the ...
Fu Xiaoqiang +4 more
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The properties of output frequencies of nonlinear volterra systems [PDF]
, 2008 Nonlinear systems usually have complicated output frequencies in the frequency domain. For the class of nonlinear Volterra systems, some interesting properties for system output frequencies are studied in this paper.
Billings, S.A., Jing, X.J., Lang, Z.Q.
core
A new statistical test based on the wavelet cross-spectrum to detect time–frequency dependence between non-stationary signals: Application to the analysis of cortico-muscular interactions [PDF]
, 2011 The study of the correlations that may exist between neurophysiological signals is at the heart of modern techniques for data analysis in neuroscience.
Amarantini, David +3 more
core +4 more sources
Revealing the structure of land plant photosystem II: the journey from negative‐stain EM to cryo‐EM
FEBS Letters, EarlyView.Advances in cryo‐EM have revealed the detailed structure of Photosystem II, a key protein complex driving photosynthesis. This review traces the journey from early low‐resolution images to high‐resolution models, highlighting how these discoveries deepen our understanding of light harvesting and energy conversion in plants.
Roman Kouřil
wiley +1 more source