Results 71 to 80 of about 52,376 (308)

Ionic Transportation Induced Electric Field Modulation in Porous Ecoflex/PTFE with Confined Liquid for High‐Performance Contact Electrification Power Generation

open access: yesAdvanced Functional Materials, EarlyView.
Porous Ecoflex/PTFE composite with encapsulated liquid generates electricity through ionic migration induced by dynamic pore deformation, creating non‐uniform electric fields that drive charge induction on electrodes. This mechanism enhances charge transfer and ensures stable contact electrification performance, achieving 12 V and 4 nC with consistent ...
Xiangkun Bo   +5 more
wiley   +1 more source

A High Order Theory for Linear Thermoelastic Shells: Comparison with Classical Theories

open access: yesJournal of Engineering, 2013
A high order theory for linear thermoelasticity and heat conductivity of shells has been developed. The proposed theory is based on expansion of the 3-D equations of theory of thermoelasticity and heat conductivity into Fourier series in terms of ...
V. V. Zozulya
doaj   +1 more source

Polarity‐Reversible Photoresponse–Driven Autonomous Wavelength Discrimination in Quantum Dot–Tellurium Thin‐Film Photodetectors via Engineered Energy‐Band Alignment

open access: yesAdvanced Functional Materials, EarlyView.
A quantum dot–tellurium thin‐film photodetector autonomously discriminates visible and infrared wavelengths through polarity‐reversible photoresponses. Engineered carrier separation and gain modulation enable filter‐free multispectral sensing within a single‐device architecture.
Yong Min Lee   +7 more
wiley   +1 more source

Emergence of Non-Fourier Hierarchies

open access: yesEntropy, 2018
The non-Fourier heat conduction phenomenon on room temperature is analyzed from various aspects. The first one shows its experimental side, in what form it occurs, and how we treated it.
Tamás Fülöp   +7 more
doaj   +1 more source

On the Fourier expansion of stationary random processes [PDF]

open access: yesProceedings of the American Mathematical Society, 1953
The purpose of this note is to demonstrate that in the Fourier expansion of a quasistationary random continuous process with continuous covariance function, the amplitudes of the frequency components do not possess the desirable property of being mutually uncorrelated unless the process degenerates to a single random variable in its range of definition.
openaire   +1 more source

Optimal fourier-hermite expansion for estimation

open access: yesStochastic Processes and their Applications, 1986
The purpose of the paper is to present a systematic method for developing an approximate recursive estimator which is optimal for the given structure and approaches the best estimate, when the order of approximation increases. The minimal variance estimate is projected onto the Hilbert subspace of all Fourier-Hermite (FH) series, driven by the ...
Ting-Ho Lo, James, Ng, Sze-Kui
openaire   +2 more sources

Fourier series expansion method for gain measurement from amplified spontaneous emission spectra of Fabry-Perot semiconductor lasers

open access: yes, 2004
A gain measurement technique, based on Fourier series expansion of periodically extended single fringe of the amplified spontaneous emission spectrum, is proposed for Fabry-Perot semiconductor lasers.
Lu, QY   +4 more
core  

Fractional transformations of generalised functions

open access: yes, 2009
A distributional theory of fractional transformations is developed. A constructive approach, based on the eigenfunction expansion method pioneered by A. H.
Lamb, Wilson   +5 more
core   +1 more source

In Situ Crystalline‐Amorphous Composite Oxide Structure Suppressing Thermal Wear Instability for Refractory Multi‐Principal Element Alloy

open access: yesAdvanced Functional Materials, EarlyView.
An effective strategy is developed to overcome the medium temperatures wear resistance degradation in refractory multi‐principal element alloys. By utilizing chemical short‐range ordering to trigger oxygen‐induced amorphization, a composite oxide structure is formed, which combines high hardness with robust stiffness.
Xuhui Pei   +7 more
wiley   +1 more source

Using Fourier and Taylor series expansion in semi-analytical deformation analysis of thick-walled isotropic and wound composite structures

open access: yesApplied and Computational Mechanics, 2016
Thick-walled tubes made from isotropic and anisotropic materials are subjected to an internal pressure while the semi-analytical method is employed to investigate their elastic deformations.
Jiran L., Mares T.
doaj  

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