Results 171 to 180 of about 205,970 (321)

General mechanisms for a top–down origin of the predator–prey power law

Oikos, EarlyView.
The ratio of predator‐to‐prey biomass density is not constant along ecological gradients: denser ecosystems tend to have fewer predators per prey, following a scaling relation known as the ‘predator–prey power law'. The origin of this surprisingly general pattern, particularly its connection with environmental factors and predator–prey dynamics, is ...
Onofrio Mazzarisi, Matthieu Barbier, Matteo Smerlak   +2 more
wiley   +1 more source

U.S. and U.K. Interest Rates 1890 - 1934: New Evidence on Structural Breaks [PDF]

This paper presents econometric evidence on whether the founding of the Federal Reserve in 1914 caused a structural change from level-stationarity to difference-stationarity in U.S. and U.K. short-term nominal interest rates.
M. E. Wohar, P. Newbold, R. Sollis, S. J. Leybourne   +3 more
core  

Unveiling the interconnectedness and volatility transmission between real assets and global stock market indices

Review of Financial Economics, EarlyView.
Abstract As economies and financial markets integrate, geopolitical tensions and global crises have fueled uncertainty and unpredictability in the financial markets, leading to increased risk and information transfer between and across asset classes. This study examines the dynamic interconnectedness and volatility spillover between commodity and G7 ...
Dhouha Mellouli, Beatrice D. Simo‐Kengne, Azza Bejaoui, Ahmed Jeribi   +3 more
wiley   +1 more source

A continuous-time GARCH process driven by a Lévy process: stationarity and second-order behaviour [PDF]

, 2004
Claudia Klüppelberg, Alexander Lindner, Ross Maller   +2 more
openalex   +2 more sources

A Physics‐Informed Learning Framework to Solve the Infinite‐Horizon Optimal Control Problem

International Journal of Robust and Nonlinear Control, EarlyView.
ABSTRACT We propose a physics‐informed neural networks (PINNs) framework to solve the infinite‐horizon optimal control problem of nonlinear systems. In particular, since PINNs are generally able to solve a class of partial differential equations (PDEs), they can be employed to learn the value function of the infinite‐horizon optimal control problem via
Filippos Fotiadis, Kyriakos G. Vamvoudakis   +1 more
wiley   +1 more source

Weak lumpability and pseudo-stationarity of finite markov chains

, 2000
James Ledoux, Patrice Leguesdron
openalex   +2 more sources

Ocean‐Atmosphere Feedback: Using the non‐stationarity in the climate system [PDF]

, 2002
B.J. Topliss
openalex   +1 more source

Robust Bounds on the Eigenvalues of Linear Systems With Delays and Their Applications in Stability Analysis

International Journal of Robust and Nonlinear Control, EarlyView.
ABSTRACT We review some known bounds on the eigenvalues of a matrix and use similar techniques to derive bounds for the class of nonlinear eigenproblems and, as a special case, the eigenvalues for LTI systems with delays. We present two classes of results.
Erik I. Verriest
wiley   +1 more source

Toward adaptive infrastructure: flexibility and agility in a non-stationarity age

, 2019
M. Chester, B. Allenby
semanticscholar   +1 more source

New Oil Price Crisis, and Health Costs: Impact on the OECD Economy: Insights From a Novel IV‐Quantile–Quantile Analysis

Sustainable Development, EarlyView.
ABSTRACT This study employs an innovative instrumental variable (IV) quantile regression approach to analyze the impact of oil price fluctuations and healthcare costs on economic growth across various income levels in OECD countries from 1970 to 2022. The analysis demonstrates that oil prices and healthcare expenditures significantly affect growth in ...
Hammed Oluwaseyi Musibau
wiley   +1 more source