Results 41 to 50 of about 2,530 (205)

Sailing Route Planning Method Considering Various User Categories

Polish Maritime Research, 2020
The article describes the methodology related to determining the multi-criteria routes for sailing ships. Details of sea area discretisation and discretisation of the description of the sailing vessel properties and manoeuvring principles are shown. User
Życzkowski Marcin
doaj   +1 more source

Sensitivity of Risk‐Based Demand Curves to Analytical Fragility Function Fitting Using Multiple‐Stripe Analyses

Earthquake Engineering &Structural Dynamics, EarlyView.
ABSTRACT Risk‐based seismic assessments using demand curves that provide mean annual exceedance rates for various system demand levels are increasingly being adopted. Such assessments combine the seismic hazard curve with fragility functions for each demand level, serving as a basis to quantify the average annual losses from system damage. Constructing
Zeyad Khalil, Peter J. Stafford, Ahmed Y. Elghazouli   +2 more
wiley   +1 more source

Discretising Keyfitz' entropy for studies of actuarial senescence and comparative demography

Methods in Ecology and Evolution, 2023
Keyfitz' entropy is a widely used metric to quantify the shape of the survivorship curve of populations, from plants to animals and microbes. Keyfitz' entropy values 1 correspond to species with a decreasing mortality rate with age (negative senescence),
Charlotte deVries, Connor Bernard, Roberto Salguero‐Gómez   +2 more
doaj   +1 more source

Local Polynomial Regression and Filtering for a Versatile Mesh‐Free PDE Solver

International Journal for Numerical Methods in Fluids, EarlyView.
A high‐order, mesh‐free finite difference method for solving differential equations is presented. Both derivative approximation and scheme stabilisation is carried out by parametric or non‐parametric local polynomial regression, making the resulting numerical method accurate, simple and versatile. Numerous numerical benchmark tests are investigated for
Alberto M. Gambaruto
wiley   +1 more source

Bending Analysis of Thickness‐ and Shear‐Deformable Materially Imperfect Composite Shells With von Kármán‐Type Geometric Nonlinearities

International Journal of Mechanical System Dynamics, EarlyView.
ABSTRACT Geometrically nonlinear static analysis of materially imperfect composite doubly curved shells is investigated via the generalised differential quadrature method. The effects of both shear and thickness deformation are considered through a thickness‐ and shear‐deformable third‐order theory formulated in curvilinear coordinates, while the ...
Behrouz Karami, Mergen H. Ghayesh, Shahid Hussain, Marco Amabili   +3 more
wiley   +1 more source

Elements of computer modelling: 12 studies for beginners. Study 2: Main stages of modelling

Science Education Quarterly
This paper is a continuation of our foundational series on computer modelling [1] and presents the main stages of the modelling process, from initial problem formulation through computational experimentation to model validation.
Illia O. Teplytskyi, Serhiy O. Semerikov
doaj   +1 more source

A conservative penalisation strategy for the semi-implicit time discretisation of the incompressible elastodynamics equation

Advanced Modeling and Simulation in Engineering Sciences, 2018
The principal aim of this work is to provide an adapted numerical scheme for the approximation of elastic wave propagation in incompressible solids. We rely on high-order conforming finite element with mass lumping for space discretisation and implicit ...
Federica Caforio, Sébastien Imperiale
doaj   +1 more source

Stability Switching in Lotka-Volterra and Ricker-Type Predator-Prey Systems with Arbitrary Step Size

Axioms, 2023
Dynamical properties of numerically approximated discrete systems may become inconsistent with those of the corresponding continuous-time system. We present a qualitative analysis of the dynamical properties of two-species Lotka-Volterra and Ricker-type ...
Shamika Kekulthotuwage Don, Kevin Burrage, Kate J. Helmstedt, Pamela M. Burrage   +3 more
doaj   +1 more source

When invasions go unnoticed: Public perception of the freshwater jellyfish Craspedacusta sowerbii in Europe

People and Nature, EarlyView.
Abstract Biological invasions are a major driver of biodiversity loss, yet inconspicuous or “cryptic” species often escape detection and public awareness, limiting management responses. We investigated the freshwater jellyfish Craspedacusta sowerbii, likely native to China and now present on six continents, through a 22‐month multilingual online survey
Guillaume Marchessaux, Kristína Slovák Švolíková, Barbora Števove, Ali Serhan Tarkan, Daniela Giannetto, Cristina Preda, Belma Kalamujić Stroil, Maciej K. Mańko, András Abonyi, Álmos Becz, Massimo Morpurgo, Evgeny A. Pakhomov, Levan Mumladze, Mar Bosch‐Belmar, Aino Hosia, Patricia Ventura, Jamileh Javidpour, Florian Lüskow   +17 more
wiley   +1 more source

Does All or Nothing Always Work Best? In Search of Advantageous Representation of Attributes

Applied Sciences
Discretisation is a processing step often included in the preliminary data preparation. Typically, when the input features have continuous domains and their discrete forms are needed, all are translated into categorical type at the same time, before data
Urszula Stańczyk, Grzegorz Baron
doaj   +1 more source