Results 1 to 10 of about 1,143,033 (294)

Sea Spectral Estimation Using ARMA Models [PDF]

Sensors, 2021
This paper deals with the spectral estimation of sea wave elevation time series by means of ARMA models. To start, the procedure to estimate the ARMA coefficients, based on the use of the Prony’s method applied to the auto-covariance series, is presented.
Marta Berardengo, Giovanni Battista Rossi, Francesco Crenna   +2 more
doaj   +3 more sources

Generative hypergraph models and spectral embedding

Scientific Reports, 2023
Many complex systems involve interactions between more than two agents. Hypergraphs capture these higher-order interactions through hyperedges that may link more than two nodes.
Xue Gong, Desmond J. Higham, Konstantinos Zygalakis   +2 more
doaj   +4 more sources

Comparison of Imaging Models for Spectral Unmixing in Oil Painting

Sensors, 2021
The radiation captured in spectral imaging depends on both the complex light–matter interaction and the integration of the radiant light by the imaging system.
Federico Grillini, Jean-Baptiste Thomas, Sony George   +2 more
doaj   +3 more sources

Singular-spectral climate models [PDF]

E3S Web of Conferences
In this paper, the singular spectrum analysis method is used to construct data models for the Onega Lake basin: time series of air temperature, precipitation, and runoff of the Shuya, Suna, and Vodla rivers.
Belashev Boris
doaj   +2 more sources

Computational Technology for the Basis and Coefficients of Geodynamo Spectral Models in the Maple System

Mathematics, 2023
Spectral models are often used in the study of geodynamo problems. Physical fields in these models are presented as stationary basic modes combinations with time-dependent amplitudes. To construct a model it is necessary to calculate the modes parameters,
Gleb Vodinchar, Liubov Feshchenko
doaj   +1 more source

Satellite Imagery to Map Topsoil Organic Carbon Content over Cultivated Areas: An Overview

Remote Sensing, 2022
There is a need to update soil maps and monitor soil organic carbon (SOC) in the upper horizons or plough layer for enabling decision support and land management, while complying with several policies, especially those favoring soil carbon storage.
Emmanuelle Vaudour, Asa Gholizadeh, Fabio Castaldi, Mohammadmehdi Saberioon, Luboš Borůvka, Diego Urbina-Salazar, Youssef Fouad, Dominique Arrouays, Anne C. Richer-de-Forges, James Biney, Johanna Wetterlind, Bas Van Wesemael   +11 more
doaj   +1 more source

Spectral Method in Epidemic Time Series: Application to COVID-19 Pandemic

Biology, 2022
Background: The age of infection plays an important role in assessing an individual’s daily level of contagiousness, quantified by the daily reproduction number.
Jacques Demongeot, Pierre Magal
doaj   +1 more source

Physics-Capturing Discretizations for Spectral Wind-Wave Models

Fluids, 2021
This paper discusses the discretization methods that have been commonly employed to solve the wave action balance equation, and that have gained a renewed interest with the widespread use of unstructured grids for third-generation spectral wind-wave ...
Marcel Zijlema
doaj   +1 more source

Differentiable Measures for Speech Spectral Modeling

IEEE Access, 2022
Autoregressive models for the envelope of speech power spectral densities (PSDs) are refined by the self-supervised spectral learning machine (S3LM) provided with differentiable spectral objective functions, including the Itakura-Saito divergence (ISD ...
Miguel Arjona Ramirez, Wesley Beccaro, Demostenes Zegarra Rodriguez, Renata Lopes Rosa   +3 more
doaj   +1 more source

Spectral form factor in sparse SYK models

Journal of High Energy Physics, 2022
We investigate the spectral form factor of the sparse Sachdev-Ye-Kitaev model. We use numerical methods to establish that at intermediate times the connected part of the spectral form factor is the dominant one.
Elena Cáceres, Anderson Misobuchi, Amir Raz   +2 more
doaj   +1 more source