Results 71 to 80 of about 2,551,833 (237)
Disentangling Bulk and Surface Contributions to Charge and Discharge Fading in High‐Voltage LiCoO2
Advanced Functional Materials, EarlyView.High‐voltage operation of LiCoO2 accelerates capacity fading through bulk and surface degradation. By introducing a LiTaO3 coating to selectively suppress surface degradation, bulk and surface contributions to charge and discharge fading are decoupled.
Hyungjoon Moon +6 more
wiley +1 more source
Theoretical and Experimental Study of Signal Processing Techniques for Measuring Hermetic Compressor Speed through Pressure and Current Signals [PDF]
, 2012 Measuring means extracting information from acquired signals. Either in the frequency or in the time, mathematical processing tools are applied to get information from measurement signals. It is usual, when processing measurement signals in the frequency
Rosa, André P. +4 more
core +1 more source
Advanced Functional Materials, EarlyView.Polarity‐matched Zr–MOFs program Nafion's nanoscale morphology during solution casting. Hydrophilic UiO‐66 preserves hydrated pathways, while hydrophobic UiO‐67 increases the proton hopping sites by densifying ionic clusters. Combining both fillers yields a membrane that delivers 176 mS cm−1 conductivity, reaches 1.46 W cm−2 under 200 kPa, and triples ...
Yonghwi Cho +13 more
wiley +1 more source
Generator Sinyal Electromyographic Dengan Menggunakan Metode Fast Fourier Transform
Semesta Teknika, 2016 Generator Sinyal mempunyai peranan penting dalam identifikasi sinyal biomedik. Salah satu sinyal biomedik adalah sinyal Electromyographic (EMG). Sinyal Electromyographic merupakan sinyal yang dihasilkan oleh otot dan dapat dianalisis dengan mengamati ...
Nur Kholis
doaj
Computation of the Fourier transform for a continuous integrable function via NFFT
Frontiers in Applied Mathematics and StatisticsWe investigate the approximation of continuous Fourier transforms by trigonometric sampling polynomials and their efficient evaluation by the non-equispaced fast Fourier transform (NFFT).
Daniel Potts, Manfred Tasche
doaj +1 more source
Chitin‐Derived Carbon‐Metal Functional Materials
Advanced Functional Materials, EarlyView.Functional carbon materials are synthesized from combination of biopolymer (chitin) and iron precursors. The resultant material exhibits superior surface area and adsorptive properties compared to carbon materials synthesized directly from pure chitin.
Herry Fang +7 more
wiley +1 more source
Applicability of a Fast Fourier Transform for a harmonic analysis
MATEC Web of Conferences, 2018 Applicability for Fast Fourier Transform of signals with low entropy are discussed in this article. Firstly, FFT is studied for case of a harmonics set shifted relative to samples of FFT. A theoretical basis is analysed. A conclusion is that the error is
Gritsutenko Stanislav, Korovkin Nikolay
doaj +1 more source
Comparative Analysis of Interpolation Techniques for FFT-Based Frequency Estimation [PDF]
Journal of Universal Computer ScienceFast Fourier transform (FFT) is a widely used method for frequency estimation in electronic support systems. However, when the intermediate frequency (IF) of the radar signal is not an exact multiple of the FFT resolution, the correct frequency value ...
Gamze Cabadag +2 more
doaj +3 more sources
Advanced Functional Materials, EarlyView.A mechanically programmable hydrogel for tissue engineering is developed by modulating the molecular threading density of poly(ethylene glycol) diacrylate‐β‐cyclodextrin (PEGDA‐β‐CD) polyrotaxane and combining it with β‐CD‐modified gelatin. The polyrotaxane‐guided transition from disordered pores to laminar microstructures enables precise tuning ...
Shiyi Chen +10 more
wiley +1 more source
Projection of acoustic fields using the Fourier transform [PDF]
, 1985 A method is presented for projecting acoustic fields using the Fourier transform. It is shown that the source velocity distribution can be represented by a number of sinusoids.
Yudelman, Errol
core +1 more source