Results 21 to 30 of about 2,463,017 (252)

Continuous Time Frequency Domain Analysis of Ф-OTDR Nonstationary Signals

open access: yesJournal of Harbin University of Science and Technology, 2021
Most of the natural vibration signals are stationary and modulated by the interference light signal of the distributed optical fiber vibration sensing system.
XU Tao, LI Li
doaj   +1 more source

Blind Receiver Design for OFDM Systems Over Doubly Selective Channels [PDF]

open access: yes, 2007
We develop blind data detectors for orthogonal frequency-division multiplexing (OFDM) systems over doubly selective channels by exploiting both frequency-domain and time-domain correlations of the received signal. We thus derive two blind data detectors:
Cui, Tao, Tellambura, Chintha
core   +1 more source

Nonparametric frequency domain analysis of nonstationary multivariate time series [PDF]

open access: yes, 2002
We analyse the properties of nonparametric spectral estimates when applied to long memory and trending nonstationary multiple time series. We show that they estimate consistently a generalized or pseudo-spectral density matrix at frequencies both close ...
Velasco, Carlos
core   +3 more sources

Synchronous machine parameter identification in frequency and time domain [PDF]

open access: yesSerbian Journal of Electrical Engineering, 2007
This paper presents the results of a frequency and time-domain identification procedure to estimate the linear parameters of a salient-pole synchronous machine at standstill.
Hasni M.   +5 more
doaj   +1 more source

Frequency-Domain Streak Camera And Tomography For Ultrafast Imaging Of Evolving And Channeled Plasma Accelerator Structures [PDF]

open access: yes, 2010
We demonstrate a prototype Frequency Domain Streak Camera (FDSC) that can capture the picosecond time evolution of the plasma accelerator structure in a single shot. In our prototype Frequency-Domain Streak Camera, a probe pulse propagates obliquely to a
Dong, P.   +5 more
core   +1 more source

Broadband Beamspace DOA Estimation: Frequency-Domain and Time-Domain Processing Approaches

open access: yesEURASIP Journal on Advances in Signal Processing, 2007
Frequency-domain and time-domain processing approaches to direction-of-arrival (DOA) estimation for multiple broadband far field signals using beamspace preprocessing structures are proposed.
Yan Shefeng
doaj   +2 more sources

Time-Domain and Monostatic-like Frequency-Domain Methods for Bistatic SAR Simulation

open access: yesSensors, 2021
In recent years, an increasing interest has been devoted to bistatic SAR configurations, which can be effectively used to improve system performance and/or to increase the amount of physical information retrievable from the observed scene.
Gerardo Di Martino   +3 more
doaj   +1 more source

Time-Domain Implementation and Analyses of Multi-Motion Modes of Floating Structures

open access: yesJournal of Marine Science and Engineering, 2022
The study of wave-structure interactions involving nonlinear forces would often make use of the popular hybrid frequency–time domain method. In the hybrid method, the frequency-domain analysis could firstly provide the reliable and accurate dynamic ...
Wanan Sheng   +6 more
doaj   +1 more source

Transient coherent Raman scattering in the time and frequency domain [PDF]

open access: yes, 1980
A new type of Raman spectroscopy is presented: After transient excitation of molecular modes coherently scattered Raman spectra are investigated in a depayed probing experiment.
Akhmanov   +13 more
core   +1 more source

Effect of duration of hypertension on heart rate variability

open access: yesNational Journal of Physiology, Pharmacy and Pharmacology, 2019
Background: Hypertension is the most prevalent noncommunicable disease. It is a multisystem disorder that affects many organs of the body including cardiovascular system, and it markedly increases both morbidity and mortality in the population ...
Jyothi S, Mangala Gowri S R
doaj   +1 more source

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