Results 11 to 20 of about 333,963 (215)

Hybrid approximations via second order combined dynamic derivatives on time scales

Electronic Journal of Qualitative Theory of Differential Equations, 2007
This article focuses on the approximation of conventional second order derivative via the combined (diamond-$\alpha$) dynamic derivative on time scales with necessary smoothness conditions embedded.
Qin Sheng
doaj   +1 more source

On Derivative Free Multiple-Root Finders with Optimal Fourth Order Convergence

Mathematics, 2020
A number of optimal order multiple root techniques that require derivative evaluations in the formulas have been proposed in literature. However, derivative-free optimal techniques for multiple roots are seldom obtained.
Janak Raj Sharma, Sunil Kumar, Lorentz Jäntschi   +2 more
doaj   +1 more source

P-Stable Higher Derivative Methods with Minimal Phase-Lag for Solving Second Order Differential Equations

Journal of Applied Mathematics, 2011
Some new higher algebraic order symmetric various-step methods are introduced. For these methods a direct formula for the computation of the phase-lag is given. Basing on this formula, calculation of free parameters is performed to minimize the phase-lag.
Fatheah A. Hendi
doaj   +1 more source

Two different spectrophotometric methods for simultaneous determination of binary mixture of atenolol and amlodipine in commercial formulation

Zanco Journal of Pure and Applied Sciences, 2022
For the simultaneous determination of a binary mixture of amlodipine (AM) and atenolol (AT) in tablets, two approaches were accessible. The first method is the second derivative of the ratio spectra (2DD) that obtained via dividing the absorption ...
Shilan A. Omer, muharam Yassin Mohammad, mohammad Abdullah   +2 more
doaj   +1 more source

Estimation of the Value of Reverse Blood Flow in the Artery by the Second Derivative of the Pulse Pressure Wave [PDF]

Известия Саратовского университета. Новая серия: Физика, 2020
Background and Objectives: Previously, the diastolic section of the pulse wave was most often analyzed as the result of reflection of a direct wave from the elements of peripheral vessels.
Baatyrov, Rahim Taalaibekovich, Kalinkin, Mikhail Yurievich, Usanov, Andrey Dmitryevich, Dobdin, Sergey Iur'evich, Skripal, Anatoly Vladimirovich   +4 more
doaj   +1 more source

Second derivative two-step peer methods

Mathematical Modelling and Analysis
This paper is devoted to extending two-step peer methods, for the numerical solution of ordinary differential equations, for the case where the second derivative of the solution is incorporated into the formula of the methods.
Mohammad Sharifi, Ali Abdi, Michał Braś, Gholamreza Hojjati   +3 more
doaj   +1 more source

Two Derivative Spectrophotometric Methods for the Simultaneous Determination of 4-AminoAntipyrine in Presence of Its Acidic Products

Ibn Al-Haitham Journal for Pure and Applied Sciences, 2018
    Simple, economic and sensitive mathematical spectrophotometric methods were developed for the estimation 4-aminoantipyrine in presence of its acidic product.
Ruba Fahmi Abbas
doaj   +3 more sources

A class of explicit second derivative general linear methods for non-stiff ODEs

Mathematical Modelling and Analysis
In this paper, we construct explicit second derivative general linear methods (SGLMs) with quadratic stability and a large region of absolute stability for the numerical solution of non-stiff ODEs.
Mohammad Sharifi, Ali Abdi, Michal Braś, Gholamreza Hojjati   +3 more
doaj   +1 more source

Memory Protection Generative Adversarial Network (MPGAN): A Framework to Overcome the Forgetting of GANs Using Parameter Regularization Methods

IEEE Access, 2020
Generative adversarial networks (GANs) suffer from catastrophic forgetting when learning multiple consecutive tasks. Parameter regularization methods that constrain the parameters of the new model in order to be close to the previous model through ...
Yifan Chang, Wenbo Li, Jian Peng, Haifeng Li, Yu Kang, Yingliang Huang   +5 more
doaj   +1 more source

High-Order Special Two-Derivative Runge–Kutta Pairs

Mathematics
This paper presents the development and analysis of novel explicit special two-derivative Runge–Kutta (STDRK) pairs for the numerical integration of ordinary differential equations (ODEs), with a focus on achieving seventh-order accuracy and embedded ...
Ibraheem Alolyan, Theodore E. Simos, Charalampos Tsitouras   +2 more
doaj   +1 more source