Results 111 to 120 of about 19,826 (256)

A safe reinforcement learning approach for autonomous navigation of mobile robots in dynamic environments

open access: yesCAAI Transactions on Intelligence Technology, EarlyView., 2023
Abstract When deploying mobile robots in real‐world scenarios, such as airports, train stations, hospitals, and schools, collisions with pedestrians are intolerable and catastrophic. Motion safety becomes one of the most fundamental requirements for mobile robots.
Zhiqian Zhou   +7 more
wiley   +1 more source

Constraint structure of the generalized Proca model in the Lagrangian formalism

open access: yesHeliyon
We introduce a novel Lagrangian approach to analyze the dynamical structure of the generalized Proca theory (GP). This method incorporates the A-Z constraint structure of the model within the Lagrangian formalism, providing a precise determination of the
Zahra Molaee, Ahmad Shirzad
doaj   +1 more source

Generalized Lagrangian Path Approach to Manifestly-Covariant Quantum Gravity Theory

open access: yesEntropy, 2018
A trajectory-based representation for the quantum theory of the gravitational field is formulated. This is achieved in terms of a covariant Generalized Lagrangian-Path (GLP) approach which relies on a suitable statistical representation of Bohmian ...
Massimo Tessarotto, Claudio Cremaschini
doaj   +1 more source

Semi‐analytical solution for the stability of deep vertical shaft considering time‐dependent rock‐structure interaction

open access: yesDeep Underground Science and Engineering, EarlyView.
A novel cavity contraction solution and multilayer shaft wall model were developed to analyze deep shaft stability, considering rock viscosity, support structures, and water pressure, with successful validation through a Hulusu Coal Mine case study.
Bin Chen   +5 more
wiley   +1 more source

Fully differentiable Lagrangian convolutional neural network for physics-informed precipitation nowcasting

open access: yesApplied Computing and Geosciences
This paper presents a convolutional neural network model for precipitation nowcasting that combines data-driven learning with physics-informed domain knowledge.
Peter Pavlík   +3 more
doaj   +1 more source

From distant shores to an emerging island: the role of surface and subsurface transport in modeling seed dispersal

open access: yesEcography, EarlyView.
Long‐distance seed dispersal by ocean currents plays a critical role in structuring coastal plant communities. As direct observations of this phenomenon are infeasible, numerical modeling is a valuable tool. Here, we use Lagrangian particle tracking to examine the colonization of the newly forming island Norderoogsand (German Bight, Wadden Sea) by five
Jakob Rahner   +4 more
wiley   +1 more source

Relativistic Motion of Stars near Rotating Black Holes

open access: yesGalaxies, 2018
Formulation of the Lagrangian approach is presented for studying features of motions of stellar bodies with non-zero rest mass in the vicinity of fast-spinning black holes. The structure of Lagrangian is discussed.
Elizabeth P. Tito, Vadim I. Pavlov
doaj   +1 more source

The contour-advective semi-Lagrangian hybrid algorithm approach to weather forecasting and freely propagating inertia-gravity waves in the shallow-water system

open access: yes, 2009
This thesis is aimed at extending the spherical barotropic contour-advective semi-Lagrangian (CASL) Algorithm, written in 1996 by David Dritschel and Maarten Ambaum, to more complex test cases within the shallow-water context.
Smith, Robert K.
core  

Smoothed particle hydrodynamics modelling for failure in metals [PDF]

open access: yes, 2010
It is generally regarded to be a difficult task to model multiple fractures leading to fragmentation in metals subjected to high strain rates using numerical methods.
Strand, Russell K
core  

The Lagrangian multiform approach to integrable systems [PDF]

open access: yes, 2021
A Lagrangian multiform enables the multi-dimensional consistency of a set of PDEs to be captured at the variational level. We offer a new perspective on the multiform Euler-Lagrange equations in terms of the variational derivative of the exterior ...
Sleigh, Duncan George
core  

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