Results 21 to 30 of about 25,983,590 (298)

CRP, PCT, and D-dimer as Biomarkers for Disease Severity in COVID-19 Patients: A Retrospective Study in Kinshasa, Democratic Republic of Congo

open access: yesJournal of Biostatistics and Epidemiology, 2023
Background: The COVID-19 pandemic has had a significant impact on global health, resulting in more than 6 million reported deaths worldwide as of April 2023.
Tasnime Hamdeni   +3 more
doaj   +1 more source

Harmonic analysis and ultracontractivity [PDF]

open access: yesTransactions of the American Mathematical Society, 1993
Let ( T t
Cowling, M, MEDA, STEFANO
openaire   +3 more sources

Simultaneous Detection of Gas Concentration and Light Intensity Based on Dual-Quartz-Enhanced Photoacoustic-Photothermal Spectroscopy

open access: yesPhotonics, 2023
This research proposes a method for the simultaneous acquisition of the second harmonic (2f) signal of quartz-enhanced photoacoustic spectroscopy (QEPAS) and the first harmonic (1f) signal of quartz-enhanced photothermal spectroscopy (QEPTS) based on the
Hao Liu   +5 more
doaj   +1 more source

A new approach for harmonic detection based on eliminating oscillatory coupling effects in microgrids

open access: yesIET Renewable Power Generation, 2023
The primary goal of grid‐connected microgrids is to control the active and reactive power, which is reachable by the inner current control loop in the control structure of power converters.
Mojtaba Ahmadi   +3 more
doaj   +1 more source

Observations of Surface Currents and Tidal Variability Off of Northeastern Taiwan from Shore-Based High Frequency Radar

open access: yesRemote Sensing, 2021
A network of high-frequency radars (HFRs) has been deployed around Taiwan. The wide-area data coverage is dedicated to revealing near real-time sea-surface current information. This paper investigates three primary objectives: (1) describing the seasonal
Yu-Ru Chen   +4 more
doaj   +1 more source

Quantum Harmonic Analysis on Lattices and Gabor Multipliers [PDF]

open access: yesJournal of Fourier Analysis and Applications, 2019
We develop a theory of quantum harmonic analysis on lattices in $${\mathbb {R}}^{2d}$$ R 2 d . Convolutions of a sequence with an operator and of two operators are defined over a lattice, and using corresponding Fourier transforms of sequences and ...
Eirik Skrettingland
semanticscholar   +1 more source

Harmonic Analysis of Modular Multilevel Matrix Converter for Fractional Frequency Transmission System

open access: yesIEEE Transactions on Power Delivery, 2020
Fractional Frequency Transmission is a competitive technology for offshore wind power transmission. Modular Multilevel Matrix Converter (M3C) plays a key role in a Fractional Frequency Transmission System (FFTS) as the frequency changer.
Jiajie Luo   +4 more
semanticscholar   +1 more source

On bases from cosines in Lebesgue spaces with variable summability index

open access: yesJournal of Inequalities and Applications, 2016
In this paper the perturbed system of cosines is considered. Under certain conditions on the summability index p ( ⋅ ) $p (\cdot )$ and perturbation, the basicity of this system in Lebesgue spaces L p ( ⋅ ) ( 0 , π ) $L_{p (\cdot )} (0,\pi )$ with ...
Togrul Muradov, Chingiz Hashimov
doaj   +1 more source

Harmonic analysis and mean field theory [PDF]

open access: yesJournal of High Energy Physics, 2018
We review some aspects of harmonic analysis for the Euclidean conformal group, including conformally-invariant pairings, the Plancherel measure, and the shadow transform.
D. Karateev   +2 more
semanticscholar   +1 more source

»What power art thou?«. Zur Harmonik Henry Purcells am Beispiel der Arie des Cold Genius aus King Arthur [PDF]

open access: yesZeitschrift der Gesellschaft für Musiktheorie, 2006
Henry Purcell überrascht immer wieder durch ungewöhnliche harmonische Wendungen, so auch in der Arie »What power art thou« des Cold Genius aus seiner Oper King Arthur (1691): Bereits das Orchestervorspiel enthält einige Besonderheiten, die sich weder mit
Cornelius Bauer
doaj   +1 more source

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