Results 41 to 50 of about 945 (188)

2‐Conformal Vector Fields on the Model Sol Space and Hyperbolic Ricci Solitons

Journal of Mathematics, Volume 2025, Issue 1, 2025.
In this study, we present the notion of 2‐conformal vector fields on Riemannian and semi‐Riemannian manifolds, which are an extension of Killing and conformal vector fields. Next, we provide suitable vector fields in Sol space that are 2‐conformal. A few implications of 2‐conformal vector fields in hyperbolic Ricci solitons are investigated.
Rawan Bossly, Ghodratallah Fasihi-Ramandi, Mohd Danish Siddiqi, Antonio Masiello   +3 more
wiley   +1 more source

A Theoretical Investigation of Channel Wave Multipath Propagation in a Coal Seam

Mathematical Problems in Engineering, Volume 2019, Issue 1, 2019., 2019
This study investigates the mechanism of channel wave multipath propagation to determine features of a channel wave in a coal seam. For this purpose, deduction formulas were used for different time delays and propagation paths and, subsequently, a multipath fading channel wave pattern was built. MATLAB software was used to simulate the model.
Yinjing Guo, Jianhua Zhang, Yuanyuan Ju, Xiaohan Guo, Gareth A. Vio   +4 more
wiley   +1 more source

On collineation groups of translation planes of order q4

International Journal of Mathematics and Mathematical Sciences, 1986
Let P be an affine translation plane of order q4 admitting a nonsolvable group G in its translation complement. If G fixes more than q+1 slopes, the structure of G is determined.
V. Jha, N. L. Johnson
doaj   +1 more source

Assessing multi‐sensor hourly maize evapotranspiration estimation using a one‐source surface energy balance approach

Irrigation and Drainage, Volume 73, Issue 3, Page 988-1009, July 2024.
Abstract In this study, the performance of a one‐source surface energy balance (OSEB) remote sensing (RS) of actual crop evapotranspiration (ETa), incorporating data from different spaceborne, airborne and proximal multispectral data, was evaluated. The RS platforms in this study included Landsat‐8 (30 m pixel size), Sentinel‐2 (10 m), Planet CubeSat ...
Edson Costa‐Filho, José L. Chávez, Huihui Zhang   +2 more
wiley   +1 more source

Homotheties of a Class of Spherically Symmetric Space‐Time Admitting G3 as Maximal Isometry Group

Advances in Mathematical Physics, Volume 2018, Issue 1, 2018., 2018
The homotheties of spherically symmetric space‐time admitting G4, G6, and G10 as maximal isometry groups are already known, whereas, for the space‐time admitting G3 as isometry groups, the solution in the form of differential constraints on metric coefficients requires further classification. For a class of spherically symmetric space‐time admitting G3
Daud Ahmad, Kashif Habib, Kaliyaperumal Nakkeeran   +2 more
wiley   +1 more source

Riemann solitons on Egorov and Cahen-Wallach symmetric spaces

AIMS Mathematics
In this paper, we consider Egorov and Cahen-Wallach symmetric spaces and study the Riemann solitons on these spaces. We prove that Egorov and Cahen-Wallach symmetric spaces admit the Riemann solitons.
Shahroud Azami, Rawan Bossly, Abdul Haseeb   +2 more
doaj   +1 more source

A Co-Point Mapping-Based Approach to Drivable Area Detection for Self-Driving Cars

Engineering, 2018
The randomness and complexity of urban traffic scenes make it a difficult task for self-driving cars to detect drivable areas. Inspired by human driving behaviors, we propose a novel method of drivable area detection for self-driving cars based on fusing
Ziyi Liu, Siyu Yu, Nanning Zheng
doaj   +1 more source

Incremental Localization Algorithm Based on Regularized Iteratively Reweighted Least Square

Foundations of Computing and Decision Sciences, 2016
Incremental localization algorithm is a distributed localization method with excellent characteristics for wireless network. However, its estimated result is generally influenced by the heteroscedasticity arising from cumulative errors and the ...
Yan Xiaoyong, Yang Zhong, Liu Yu, Xu Xiaoduo, Li Huijun   +4 more
doaj   +1 more source

Matrix spread sets of p-primitive semifield planes

International Journal of Mathematics and Mathematical Sciences, 1997
In this article we present the matrix spread sets of the p-primitive planes of order p4 where p=3,5,7,11.
M. Cordero
doaj   +1 more source

Collineations of a symmetric 2-covariant tensor: Ricci collineations [PDF]

Journal of Mathematical Physics, 2013
The infinitesimal transformations that leave invariant a two-covariant symmetric tensor are studied. The interest of these symmetry transformations lays in the fact that this class of tensors includes the energy-momentum and Ricci tensors. We find that in most cases the class of infinitesimal generators of these transformations is a finite dimensional ...
openaire   +3 more sources