Results 111 to 120 of about 34,743 (255)

A Review of Green's Function Methods for Tracer Timescales and Pathways in Ocean Models

open access: yesJournal of Advances in Modeling Earth Systems, Volume 17, Issue 7, July 2025.
Abstract Understanding advective‐diffusive dispersal of trace substances in environmental fluids like the global ocean is a ubiquitous challenge in geophysics. Since the turn of the millennium, substantial progress has been made in the theory, implementation in models, and application of such tracers in oceanography.
Thomas W. N. Haine   +3 more
wiley   +1 more source

Dimensionality Reduction in Full‐Waveform Inversion Uncertainty Analysis

open access: yesGeophysical Prospecting, Volume 73, Issue 6, July 2025.
ABSTRACT The uncertainty of model parameters obtained by full‐waveform inversion can be determined from the Hessian of the least‐squares error functional. A description of uncertainty characterisation is presented that takes the null space of the Hessian into account and does not rely on the Bayesian formulation.
W. A. Mulder, B. N. Kuvshinov
wiley   +1 more source

Spatial and spatiotemporal volatility models: A review

open access: yesJournal of Economic Surveys, Volume 39, Issue 3, Page 1037-1091, July 2025.
Abstract Spatial and spatiotemporal volatility models are a class of models designed to capture spatial dependence in the volatility of spatial and spatiotemporal data. Spatial dependence in the volatility may arise due to spatial spillovers among locations; that is, in the case of positive spatial dependence, if two locations are in close proximity ...
Philipp Otto   +4 more
wiley   +1 more source

A Video Dual-Domain Blind Watermarking Algorithm Based on Hadamard Transform

open access: yesMathematics
Addressing the compatibility challenges surrounding the robustness and reversibility of existing video watermarking techniques, this study introduces a novel video dual-domain blind watermarking algorithm leveraging the Hadamard transform.
Yucheng Liang   +4 more
doaj   +1 more source

Discrete Hartley matrix transform precoding-based OFDM system to reduce the high PAPR

open access: yesICT Express, 2019
The high peak-to-average power ratio (PAPR) is one of the major drawbacks of the orthogonal frequency division multiplexing (OFDM) systems that make non-linear distortion in practical implementation of high power amplifier (HPA).
Abbas Ali Sharifi
doaj  

Walsh–Hadamard Transform Based Non-Orthogonal Multiple Access (NOMA) and Interference Rejection Combining in Next-Generation HetNets [PDF]

open access: gold, 2021
Muhammad Rehan Usman   +6 more
openalex   +1 more source

The Robin problems for the coupled system of reaction–diffusion equations

open access: yesBoundary Value Problems
This article investigates the local well-posedness of Turing-type reaction–diffusion equations with Robin boundary conditions in the Sobolev space. Utilizing the Hadamard norm, we derive estimates for Fokas unified transform solutions for linear initial ...
Po-Chun Huang, Bo-Yu Pan
doaj   +1 more source

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