Results 91 to 100 of about 2,175,773 (278)

Weak solutions for anisotropic parabolic equations with low-integrability initial data

Advances in Nonlinear Analysis
We study an anisotropic nonlinear parabolic equation with initial data u 0 ∈ L r(Ω), for 1 < r < 2, and a general Carathéodory lower-order term. The zero-order term is allowed to grow with a coefficient b(x, t) belonging to a suitable Lorentz space ...
Li Zhongqing
doaj   +1 more source

Integrating Grain to Ground Motion Data for Critical Rock Bridge and Slope Failure Analysis

International Journal for Numerical and Analytical Methods in Geomechanics, EarlyView.
ABSTRACT Rock masses can fail catastrophically with little warning, yet their stability depends on hidden internal connections that channel forces and localise damage. Among these, rock bridges–a “known unknown” in slope mechanics–lock fractured rock and control how failure unfolds, but their concealed geometry and uncertain strength obscure where and ...
Antoinette Tordesillas, Shuo Zhou, Leonnardo Probst, Pat Bellett, Michal Nitka, Jacek Tejchman   +5 more
wiley   +1 more source

EnKF and expectation‐maximization based parameter estimation of a convective gravity‐wave parameterization using Strateole 2 constant‐level balloon data

Quarterly Journal of the Royal Meteorological Society, EarlyView.
An offline methodology is applied to estimate parameters of a convective gravity‐wave scheme using momentum flux (MF) observations from constant‐level balloons (left panels: pdfs of east and west MFs in green from observations and black from EnKF). The approach integrates an ensemble Kalman filter with an expectation‐maximization algorithm and permits ...
F. Lott, P. Tandeo, M. Pulido, D. Bardet
wiley   +1 more source

Feedback Linearisation with State Constraints

International Journal of Robust and Nonlinear Control, EarlyView.
ABSTRACT Feedback Linearisation (FBL) is a widely used technique that applies feedback laws to transform input‐affine nonlinear control systems into linear control systems, allowing for the use of linear controller design methods such as pole placement.
Songlin Jin, Yuanbo Nie, Morgan Jones
wiley   +1 more source

Sliding Motions on Non‐Euclidean State Spaces: A Differential‐Geometric Perspective

International Journal of Robust and Nonlinear Control, EarlyView.
ABSTRACT This paper extends sliding‐mode control theory to nonlinear systems evolving on smooth manifolds. Building on differential geometric methods, we reformulate Filippov's notion of solutions, characterize well‐defined vector fields on quotient spaces, and provide a consistent geometric definition of higher‐order sliding modes.
Fernando Castaños
wiley   +1 more source

Fixed Points of Self-Mappings with Jumping Effects: Application to Stability of a Class of Impulsive Dynamic Systems

Mathematics
This paper studies the boundedness and convergence properties of the sequences generated by strict and weak contractions in metric spaces, as well as their fixed points, in the event that finite jumps can take place from the left to the right limits of ...
Manuel De la Sen, Asier Ibeas, Aitor J. Garrido, Izaskun Garrido   +3 more
doaj   +1 more source

A note on almost sure convergence and convergence in measure [PDF]

, 2014
summary:The present article studies the conditions under which the almost everywhere convergence and the convergence in measure coincide.
Kříž, P., Štěpán, J.
core   +1 more source

Green Transition, Extractive Continuities: Lithium Mining and the Environmental Contradictions of Sustainability

Sustainable Development, EarlyView.
ABSTRACT Global decarbonization has positioned lithium as a strategic mineral for electric vehicles, battery storage, and low‐carbon development. Yet its extraction raises serious environmental, political, and justice concerns that complicate dominant narratives of clean energy progress.
Jacob Kwakye
wiley   +1 more source

A canonical entropy-based multiscale decomposition of functions

Journal of Physics Communications
We introduce a canonical entropy-based multiscale decomposition of nonnegative $L^1$ functions that yields both physically meaningful approximations and an injective representation.
Rajeev Rajaram, Nathan Ritchey
doaj   +1 more source

Wavelets: convergence almost everywhere

Mathematical Communications, 1996
It has been proved in [7], using the Carleson-Hunt theorem on the pointwise convergence of Fourier series, that the wavelet inversion formula is valid pointwise for all L^p -functions, and also without restrictions on wavelets.
openaire   +3 more sources