Results 61 to 70 of about 99,796 (273)

On the numerical solutions of some Volterra equations on infinite intervals

Journal of Numerical Analysis and Approximation Theory, 1976
The paper discusses long time behavior and error bounds for discretized Volterra equations. A key property is positivity of the quadrature which is combined with monotonicity properties of the nonlinearities in the equations.
Olavi Nevanlinna
doaj   +2 more sources

Fractional Partial Differential Equation Modeling for Solar Cell Charge Dynamics

Fractal and Fractional
This paper presents a groundbreaking numerical approach, the fractional differential quadrature method (FDQM), to simulate the complex dynamics of organic polymer solar cells.
Waleed Mohammed Abdelfattah, Ola Ragb, Mohamed Salah, Mohamed S. Matbuly, Mokhtar Mohamed   +4 more
doaj   +1 more source

The application of the differential quadrature method based on a piecewise polynomial to the vibration analysis of geometrically nonlinear beams

Computer Assisted Methods in Engineering and Science, 2022
The paper deals with the application of the differential quadrature method based on a piecewise polynomial to the nonlinear vibration analysis of beams. The initial-boundary-value problem is solved to study the computational stability of the method. The
Artur Krowiak
doaj  

Matrix-free weighted quadrature for a computationally efficient isogeometric $k$-method

, 2018
The $k$-method is the isogeometric method based on splines (or NURBS, etc.) with maximum regularity. When implemented following the paradigms of classical finite element methods, the computational resources required by the $k-$method are prohibitive even
Sangalli, Giancarlo, Tani, Mattia
core   +1 more source

Self‐Similar Blowup for the Cubic Schrödinger Equation

Communications on Pure and Applied Mathematics, EarlyView.
ABSTRACT We give a rigorous proof for the existence of a finite‐energy, self‐similar solution to the focusing cubic Schrödinger equation in three spatial dimensions. The proof is computer‐assisted and relies on a fixed point argument that shows the existence of a solution in the vicinity of a numerically constructed approximation.
Roland Donninger, Birgit Schörkhuber
wiley   +1 more source

Digital Rights Activism in Multilevel Governance

European Policy Analysis, EarlyView.
ABSTRACT Multilevel governance (MLG) without a clear hierarchical structure can create power imbalances among various actors, particularly in settings with overlapping jurisdictions and policy areas. This dynamic is especially pronounced in Internet governance, which faces a complex interplay of domestic laws, state interdependence, and heightened ...
Alison Harcourt
wiley   +1 more source

Statistics of non-linear stochastic dynamical systems under L\'evy noises by a convolution quadrature approach

, 2011
This paper describes a novel numerical approach to find the statistics of the non-stationary response of scalar non-linear systems excited by L\'evy white noises.
Cottone G Di Paola M Marino F, Dybiec B, Gikhman I I, Giulio Cottone, Grigoriu M, Lin Y K, Masud A, Metzler R, Protter Philip E, Risken H, Roberts J B, Samko S G, Sobczyk K, Wedig W V, Young D M   +14 more
core   +1 more source

Sustainable Optimization of Emissions and Performance in Hydrogen Port Injection Diesel Engines Through Port Timing and Injection Duration Modulation

Energy Science &Engineering, EarlyView.
Optimizing hydrogen port injection in diesel engines significantly improves efficiency and reduces emissions, demonstrating a sustainable dual‐fuel strategy for cleaner transportation solutions and lower environmental impact. ABSTRACT This study evaluates a single‐cylinder hydrogen port injection (HPFI) Diesel engine by systematically varying the ...
Kaustubh R. Kapadani, Nithyananda B S, Shrishail B. Sollapur, Rajesh K, Ashish M. Dharme, Hemant K, Nagaraj Ashok, Abhijit Bhowmik   +7 more
wiley   +1 more source

Robust Control Using a Matrix Converter to Enhance Wind Turbine Systems

Energy Science &Engineering, EarlyView.
This study uses a more efficient and effective solution to improve the operational performance of a wind turbine‐based power system. This system uses a doubly fed induction generator and relies on a matrix converter and fractional‐order proportional–integral controller.
Sihem Ghoudelbourk, Habib Benbouhenni, Adil Yahdou, Zakaria Mohamed Salem Elbarary, Nicu Bizon   +4 more
wiley   +1 more source

A note on a family of quadrature formulas and some applications [PDF]

Opuscula Mathematica, 2008
In this paper a construction of a one-parameter family of quadrature formulas is presented. This family contains the classical quadrature formulas: trapezoidal rule, midpoint rule and two-point Gauss rule.
Bogusław Bożek, Wiesław Solak, Zbigniew Szydełko   +2 more
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