Results 101 to 110 of about 83,771 (308)

A Geometric Interpretation for the Algebraic Properties of Second‐Order Ordinary Differential Equations

Mathematical Methods in the Applied Sciences, Volume 48, Issue 6, Page 6912-6917, April 2025.
ABSTRACT Nowadays, a substantial portion of investigations concerning the symmetry analysis of differential equations predominantly adhere to a framework comprising the following key procedures: (i) the derivation of symmetries, (ii) the determination of an optimal system, (iii) the utilization of these symmetries to construct invariants or ...
A. Paliathanasis, S. Moyo, P. G. L. Leach   +2 more
wiley   +1 more source

Falling into the Past: Geodesics in a Time Travel Metric

Universe
We investigate timelike and null geodesics within the rotating “time machine” spacetime proposed by Ralph, T.C.; et al. Phys. Rev. D 2020, 102, 124013. This is a rotating analogue of Alcubierre’s warp drive spacetime.
Colin MacLaurin, Fabio Costa, Timothy C. Ralph   +2 more
doaj   +1 more source

Abstract Boundary Delay Systems and Application to Network Flow

Mathematical Methods in the Applied Sciences, EarlyView.
ABSTRACT This paper investigates the well‐posedness and positivity of solutions to a class of delayed transport equations on a network. The material flow is delayed at the vertices and along the edges. The problem is reformulated as an abstract boundary delay equation, and well‐posedness is proved by using the Staffans–Weiss theory.
András Bátkai, Marjeta Kramar Fijavž, Abdelaziz Rhandi   +2 more
wiley   +1 more source

How sensitive are Sahelian mesoscale convective systems to cold‐pool suppression?

Quarterly Journal of the Royal Meteorological Society, EarlyView.
Cold pools are a ubiquitous feature of mesoscale convective systems (MCSs) with important upscale impacts on West African climate, but their role in the maintenance of tropical MCSs remains debated. Using a 40‐day model with explicit convection and no rainfall evaporation, we show that cold pools do not play a primary role in Sahel MCS development or ...
Ben Maybee, James Bassford, John H. Marsham, Huw Lewis, Paul Field, Cornelia Klein, Douglas J. Parker   +6 more
wiley   +1 more source

A visualization of null geodesics for the bonnor massive dipole

Revista de Matemática: Teoría y Aplicaciones, 2015
In this work we simulate null geodesics for the Bonnor massive dipole metric by implementing a symbolic-numerical algorithm in Sage and Python. This program is also capable of visualizing in 3D, in principle, the geodesics for any given metric. Geodesics
G. Andree Oliva Mercado, Javier Bonatti González, Iván Cordero García, Francisco Frutos Alfaro   +3 more
doaj   +1 more source

The Generalized Beltrami Problem Concerning Geodesic Representation [PDF]

, 1903
Edward Kasner
openalex   +1 more source

Contrasting impacts of two mesoscale cyclones on the South Shetland Islands' glaciers, northern Antarctic Peninsula

Quarterly Journal of the Royal Meteorological Society, EarlyView.
This study analyzed the impact of two mesoscale cyclones on the meteorology and glaciology of South Shetland Islands (SSI) glaciers, using in‐situ observations, ERA5 reanalysis data, and high‐resolution weather and glacier mass balance models. Mesoscale cyclones drive temperature drops, heavy snowfall, and strong winds over the SSI, significantly ...
Christian Torres, Deniz Bozkurt, Michael Matějka, Kamil Láska, Sibin Simon, Ricardo Jaña, Jorge Arigony‐Neto   +6 more
wiley   +1 more source

Smooth and Energy Saving Gait Planning for Humanoid Robot Using Geodesics

Applied Bionics and Biomechanics, 2012
A novel gait planning method using geodesics for humanoid robot is given in this paper. Both the linear inverted pendulum model and the exact Single Support Phase (SSP) are studied in our energy optimal gait planning based on geodesics.
Liandong Zhang, Changjiu Zhou
doaj   +1 more source

Land data assimilation of satellite‐based surface soil moisture: Impact on atmospheric simulations over the contiguous United States

Quarterly Journal of the Royal Meteorological Society, EarlyView.
Soil Moisture Active Passive soil moisture retrievals are assimilated into a land surface model and the resulting land reanalysis product is used to initialise the land component of coupled land‐atmosphere experiments. We show that the local impact of land data assimilation on the atmosphere is influenced by two factors: the magnitude by which it ...
Zdenko Heyvaert, Michel Bechtold, Wouter Dorigo, Jonas Mortelmans, Daniel Hagan, Joseph Santanello, Gabriëlle De Lannoy   +6 more
wiley   +1 more source

Compact Riemannian Manifolds with Homogeneous Geodesics

Symmetry, Integrability and Geometry: Methods and Applications, 2009
A homogeneous Riemannian space (M = G/H,g) is called a geodesic orbit space (shortly, GO-space) if any geodesic is an orbit of one-parameter subgroup of the isometry group G. We study the structure of compact GO-spaces and give some sufficient conditions
Dmitrii V. Alekseevsky, Yurii G. Nikonorov   +1 more
doaj   +1 more source