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Superfast Line Spectral Estimation [PDF]

open access: yesIEEE Transactions on Signal Processing, 2018
16 pages, 7 figures, accepted for IEEE Transactions on Signal ...
Thomas Lundgaard Hansen   +2 more
openaire   +5 more sources

Triple Spectral Line Imaging of Whole-Body Human Skin: Equipment, Image Processing, and Clinical Data [PDF]

open access: yesSensors
Multispectral imaging can provide objective quantitative data on various clinical pathologies, e.g., abnormal content of bio-substances in human skin.
Janis Spigulis   +5 more
doaj   +2 more sources

Discrete time model of self-oscillations with spectral line widening

open access: yesФизика волновых процессов и радиотехнические системы, 2022
An algorithm for generating quasi-harmonic self-oscillations with a uniformly widened spectral line is presented. The algorithm is based on the equation of motion of the Thomson-type DT-oscillator, which introduced a random effect in the form of band ...
Valery V. Zaitsev   +2 more
doaj   +1 more source

Spectral Line VLBI Studies Using the ngEHT

open access: yesGalaxies, 2023
Spectroscopy in the mm/sub-mm wavelength range is a powerful tool to study the gaseous medium in various astrophysical environments. The next generation Event Horizon Telescope (ngEHT) equipped with a wide-bandwidth backend system has great potential for
Dong-Jin Kim, Vincent Fish
doaj   +1 more source

S-type Stars: Line List for the A2Π–X2Σ+ Band System of LaO

open access: yesThe Astrophysical Journal, 2023
LaO bands are found in the spectra of cool S-type stars. The bands of the A ^2 Π–X ^2 Σ ^+ transition with $v^{\prime} \leqslant 3$ and v ″ ≤ 4 are rotationally analyzed, providing spectroscopic constants for the A ^2 Π state.
P. F. Bernath   +2 more
doaj   +1 more source

Wavelengths and Energy Levels of the Upper Levels of Singly Ionized Nickel (Ni ii) from 3d 8(3 F)5f to 3d 8(3 F)9s

open access: yesThe Astrophysical Journal Supplement Series, 2023
Using high-resolution spectra of Ni ii recorded using Fourier transform (FT) spectroscopy of continuous, nickel–helium hollow cathode discharge sources in the region 143–5555 nm (1800–70,000 cm ^−1 , the analysis of 1016 Ni ii lines confirmed and ...
Christian P. Clear   +4 more
doaj   +1 more source

Spectral line extraction based on ant-colony algorithm

open access: yesEURASIP Journal on Advances in Signal Processing, 2021
A spectral-line-extraction algorithm based on the ant-colony algorithm is proposed to address the difficulty of extracting spectral lines in low signal-to-noise ratio conditions, and the problem that results from the optimal path algorithm falls into ...
Yusheng Cheng   +4 more
doaj   +1 more source

Review of Rydberg Spectral Line Formation in Plasmas

open access: yesAtoms, 2023
The present review is dedicated to the problem of an array of transitions between highly-excited atomic levels. Hydrogen atoms and hydrogen-like ions in plasmas are considered here. The presented methods focus on calculation of spectral line shapes. Fast
Andrey Yu. Letunov, Valery S. Lisitsa
doaj   +1 more source

Model parameter estimations of the multi-channel turbulence response from flutter flight tests based on autoregressive spectra

open access: yesJournal of Low Frequency Noise, Vibration and Active Control, 2023
Signal processing of flutter flight test data enables verification of aircraft flutter design, and the signal from a flutter flight test excited by atmospheric turbulence is a particularly important form of the flutter test.
Shiqiang Duan, Hua Zheng
doaj   +1 more source

Neural network-based image reconstruction in swept-source optical coherence tomography using undersampled spectral data

open access: yesLight: Science & Applications, 2021
Optical coherence tomography (OCT) is a widely used non-invasive biomedical imaging modality that can rapidly provide volumetric images of samples. Here, we present a deep learning-based image reconstruction framework that can generate swept-source OCT ...
Yijie Zhang   +7 more
doaj   +1 more source

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