Results 31 to 40 of about 4,950,422 (249)

On the convergence of Fourier series

open access: yesInternational Journal of Mathematics and Mathematical Sciences, 1984
We define the space Bp={f:(−π,π]→R,   f(t)=∑n=0∞cnbn(t),   ∑n=0∞|cn|
Geraldo Soares de Souza
doaj   +1 more source

dynoGP: Deep Gaussian Processes for Dynamic System Identification

open access: yesInternational Journal of Adaptive Control and Signal Processing, EarlyView.
This work introduces a novel class of deep models for system identification, dynamical deep Gaussian processes, which combine the strengths of data‐driven methods, such as those based on neural network architectures, with the ability to output a probability distribution for uncertainty representation.
Alessio Benavoli   +3 more
wiley   +1 more source

Mechanochemical Synthesis and Characterization of Nanostructured ErB4 and NdB4 Rare‐Earth Tetraborides

open access: yesAdvanced Engineering Materials, Volume 27, Issue 6, March 2025.
ErB4 and NdB4 nanostructured powders are produced by mechanochemical synthesis. 5 h mechanical alloying and 4 M HCl acid leaching are used in the production. ErB4 and NdB4 powders exhibit maximum magnetization of 0.4726 emu g−1 accompanied with an antiferromagnetic‐to‐paramagnetic phase transition at about TN = 18 K and 0.132 emu g−1 with a maximum at ...
Burçak Boztemur   +5 more
wiley   +1 more source

Weak behaviour of Fourier-Jacobi series [PDF]

open access: yes, 1990
Necessary conditions for the weak convergence of Fourier series in orthogonal polynomials are given. It is shown that the partial sum operator associated with the Jacobi series is of restricted weak type, but not of weak type, for the endpoints of the ...
Guadalupe, J.   +2 more
core  

Fourier Series and Twisted C*-Crossed Products [PDF]

open access: yes, 2015
This paper is an invitation to Fourier analysis in the context of reduced twisted C*-crossed products associated with discrete unital twisted C*-dynamical systems. We discuss norm-convergence of Fourier series, multipliers and summation processes.
Bedos, Erik Christopher   +2 more
core   +1 more source

Harmonic Quantitative Analysis for Dead-Time Effects in SPWM Inverters

open access: yesIEEE Access, 2019
Dead-time is commonly designed to avoid shoot-through phenomenon within each arm in voltage source converter. The presence of dead-time tends to cause a power quality issue.
Ning Jiao   +4 more
doaj   +1 more source

Controlling Grain Growth in Powder Bed Fusion of Yttria‐Stabilized Zirconia Using Femtosecond Lasers: Challenges and Methodological Insights

open access: yesAdvanced Engineering Materials, EarlyView.
Binder‐free laser powder bed fusion of 8YSZ with a femtosecond laser is used to map process windows linking scan strategy, heat accumulation, and grain growth. Time‐resolved thermography and simulations reveal thermal regimes that enable continuous, vitrified, and fine‐grained 8YSZ surface layers without absorptive additives and demonstrate ...
Markus Kühn   +5 more
wiley   +1 more source

Impact of Hydrogen Incorporation on Electronic and Magnetic Structure of X2CrNi18‐9 Stainless Steel

open access: yesAdvanced Engineering Materials, EarlyView.
Hydrogen uptake in austenitic stainless steel alters both its electronic and magnetic structure. Seebeck measurements reveal hydrogen‐induced shifts in the electronic density of states, while neutron scattering uncovers nanoscale inhomogeneities that grow upon hydrogen incorporation, with the most pronounced effect observed in the PBF as‐built state ...
Torben Tappe   +9 more
wiley   +1 more source

On the Efficacy of Fourier Series Approximations for Pricing European Options [PDF]

open access: yes, 2014
This paper investigates several competing procedures for computing the prices of vanilla Euro-pean options, such as puts, calls and binaries, in which the underlying model has a characteristic function that is known in semi-closed form.
A. J. Mcclell   +5 more
core   +1 more source

On (𝑁,𝑝,𝑞)(𝐸,1) Summability of Fourier Series

open access: yesInternational Journal of Mathematics and Mathematical Sciences, 2009
A new theorem on (𝑁,𝑝,𝑞)(𝐸,1) summability of Fourier series has been established.
H. K. Nigam, Ajay Sharma
doaj   +1 more source

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