Results 21 to 30 of about 150 (120)

A Comparison of Spatial and Nonspatial Methods in Statistical Modeling of NO2: Prediction Accuracy, Uncertainty Quantification, and Model Interpretation

Geographical Analysis, Volume 55, Issue 4, Page 703-727, October 2023., 2023
NO2$$ {\mathrm{NO}}_2 $$ is a traffic‐related air pollutant. Ground NO2$$ {\mathrm{NO}}_2 $$ monitoring stations measure NO2$$ {\mathrm{NO}}_2 $$ concentrations at certain locations and statistical predictive methods have been developed to predict NO2$$ {\mathrm{NO}}_2 $$ as a continuous surface. Among them, ensemble tree‐based methods have shown to be
Meng Lu, Joaquin Cavieres, Paula Moraga
wiley   +1 more source

Extending the Application of Connectivity Metrics for Characterizing the Dynamic Behavior of Water Distribution Networks

Water Resources Research, Volume 59, Issue 8, August 2023., 2023
Abstract Water distribution networks (WDNs) are complex combinations of nodes and links, and the current tendency is to modify their topological structure through the closure of isolation valves for monitoring and water quality reasons. For their analysis, several approaches based on graph theory have recently been proposed, mainly considering steady ...
V. Marsili, S. Alvisi, F. Maietta, C. Capponi, S. Meniconi, B. Brunone, M. Franchini   +6 more
wiley   +1 more source

A Note on the Estrada Index of the A_α-Matrix

Mathematics, 2021
Let G be a graph on n vertices. The Estrada index of G is an invariant that is calculated from the eigenvalues of the adjacency matrix of a graph. V. Nikiforov studied hybrids of A(G) and D(G) and defined the Aα-matrix for every real α∈[0,1] as: Aα(G)=αD(
Jonnathan Rodríguez, Hans Nina
doaj   +1 more source

Mean first‐passage time of cell migration in confined domains

Mathematical Methods in the Applied Sciences, Volume 46, Issue 6, Page 7435-7453, April 2023., 2023
A number of key biological processes involving cell migration in which cells traverse boundaries separating well‐defined tissues can be modeled in terms of mean first‐passage time (MFPT) problems in confined domains. Motivated by this scenario, we consider suitable three‐dimensional domains Ω$$ \Omega $$ on which MFPT functions T$$ T $$, fulfilling a ...
Hélia Serrano, Ramón F. Álvarez‐Estrada, Gabriel F. Calvo   +2 more
wiley   +1 more source

Potential Vorticity Dynamics Explain How Extratropical Oceans and the Arctic Modulate Wintertime Land‐Temperature Variations

Earth's Future, Volume 11, Issue 2, February 2023., 2023
Abstract Temperature variations across the continental northern hemisphere at the interdecadal scale are thought to be remotely modulated by oceanic internal climate variability and the Arctic. Nevertheless, further elucidating the dynamics is essential for clarifying ongoing debates.
Yongkun Xie, Jianping Huang, Guoxiong Wu, Yimin Liu   +3 more
wiley   +1 more source

Computation of Benzenoid Planar Octahedron Networks by Using Topological Indices

Mathematical Problems in Engineering, Volume 2023, Issue 1, 2023., 2023
Chemical descriptors are numeric numbers that contain a basic chemical structure and describe the structure of a graph. A graph’s topological indices are linked to its chemical characteristics. Biological activity of chemical compounds can be predicted using topological indices.
Didar Abdulkhaleq Ali, Haidar Ali, Qurat Ul Ain, Syed Ajaz K. Kirmani, Parvez Ali, Mohamed Sesay, Gohar Ali   +6 more
wiley   +1 more source

A New Graphical Representation of the Old Algebraic Structure

Journal of Mathematics, Volume 2023, Issue 1, 2023., 2023
The most recent advancements in algebra and graph theory enable us to ask a straightforward question: what practical use does this graph connected with a mathematical system have in the real world? With the use of algebraic approaches, we may now tackle a wide range of graph theory‐related problems.
Muhammad Nadeem, Imran Siddique, Md. Ashraful Alam, Waqas Ali, Xuanlong Ma   +4 more
wiley   +1 more source

Graph Energy Variants and Topological Indices in Platinum Anticancer Drug Design: Mathematical Insights and Computational Analysis with DFT and QTAIM

Journal of Mathematics, Volume 2023, Issue 1, 2023., 2023
In this paper, we present a new approach that explores the application of graph energy variants in chemistry, specifically in the development of platinum anticancer drugs. While previous energy variants have been proposed without considering their direct relevance to chemistry, our study focuses on two key aspects. First, we investigate the correlation
Suha Wazzan, Nurten Urlu Ozalan, Stanislaw Migorski   +2 more
wiley   +1 more source

Time‐Varying Consensus Control Method of Hybrid Hierarchical Distributed Formation

International Journal of Aerospace Engineering, Volume 2022, Issue 1, 2022., 2022
Aiming at the problem of formation control, a hybrid hierarchical distributed formation structure based on the virtual leader, centralized, and distributed structure is proposed and named active agent AA. Based on the established formation structure, a time‐varying formation consensus control model and the changed model with no collision condition ...
Hongyun Wang, Min Gao, Dan Fang, Whenzhao Li, Zihua Kong, Francisco Ronay Lopez Estrada   +5 more
wiley   +1 more source

Edge feature enhancement approach using hilbert transform of Cauchy distribution and its applications

IET Image Processing, Volume 15, Issue 12, Page 2891-2909, October 2021., 2021
Abstract Building on past work showing that the Hilbert transform can be used for edge feature enhancement, a new edge feature enhancement method is developed using a two‐dimensional (2D) isotropic Hilbert transform of the Cauchy distribution. First, both the shape of the Hilbert kernel and the Hilbert transform of edge feature models (step and delta ...
Ke Wang, Gustavo K. Rohde, Jian Xiao
wiley   +1 more source