Results 71 to 80 of about 105,617 (259)

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  

Comparative Analysis of Interpolation Techniques for FFT-Based Frequency Estimation [PDF]

Journal of Universal Computer Science
Fast 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, Ali Degirmenci, Omer Karal   +2 more
doaj   +3 more sources

Optical Signature of Moiré Superlattices Formed by Twisted SrTiO3 Membranes

Advanced Functional Materials, EarlyView.
We discover optical signatures from bonded interfaces in twisted SrTiO3 moiré superlattices, including low‐frequency Raman vibrational modes and strong second‐harmonic generation, consistent with strong interlayer coupling inferred from cross‐sectional electron microscopy and ab initio calculations. ABSTRACT Moiré superlattices formed at the interfaces
T. A. M. Ragib Shahriar, Fumikazu Murakami, Xing He, Konnor Koons, Xinyan Li, Bumseop Kim, Shihan Qin, Varun Harbola, Jochen Mannhart, Yimo Han, Ruijuan Xu, Shengxi Huang, Andrew M. Rappe, Hanyu Zhu   +13 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

Bioinspired Hierarchically Interconnected Supermacroporous Hydrogels via Dual‐Templating for Rapid Atmospheric Water Harvesting

Advanced Functional Materials, EarlyView.
Inspired by lung alveolar architecture, a dual‐templating strategy combining CO2 bubble and ice templating creates mechanically robust super‐macroporous hydrogels with highly interconnected transport pathways. The resulting material achieves 3.37× faster moisture sorption and 1.72× higher solar‐driven water release than single‐templated counterparts ...
Pan Huang, Weiyan Zhu, Yuanyuan Wang, Hanxiao Zhang, Ying Hu, Siyuan Yang, Wenshuai Yang, Hongbo Zeng   +7 more
wiley   +1 more source

From Photoalignment to Structured Light: Liquid Crystal Platforms for Beam Shaping and Complex Wavefronts

Advanced Functional Materials, EarlyView.
Photoaligned and photopatterned liquid crystal platforms provide programmable control of optical phase, polarization, and spin‐orbit interactions, enabling compact generation of structured light and complex wavefronts. This review highlights how tailored molecular orientations transform simple beams into designed optical fields, opening versatile ...
Le Zhou, Tingjun Zhong, Sijie Liu, Pouya Nosratkhah, Ke Xu, Yuzhen Zhao, Kristiaan Neyts   +6 more
wiley   +1 more source

Is the algorithm used to process heart rate variability data clinically relevant? Analysis in male adolescents

Einstein (São Paulo)
Objective To analyze whether the algorithm used for the heart rate variability assessment (fast Fourier transform versus autoregressive methods) influenced its association with cardiovascular risk factors in male adolescents.
Antonio Henrique Germano Soares, Breno Quintella Farah, Gabriel Grizzo Cucato, Carmelo José Albanez Bastos-Filho, Diego Giulliano Destro Christofaro, Luiz Carlos Marques Vanderlei, Aluísio Henrique Rodrigues de Andrade Lima, Raphael Mendes Ritti-Dias   +7 more
doaj   +1 more source

Experimental Research on Adaptive 128/64QAM DFT-Spread IFFT/FFT Size Efficient OFDM With a High SE in VLLC System

IEEE Photonics Journal, 2017
In this paper, an adaptive inverse fast Fourier transform and fast Fourier transform (IFFT/FFT) size efficient orthogonal frequency division multiplexing (OFDM) modulation scheme with 128/64-quadrature amplitude modulation (QAM) and ...
Qinghui Chen, Jing He, Rui Deng, Ming Chen, Fangliu Zhang, Min Dai, Fengting Long, Lin Chen   +7 more
doaj   +1 more source

A Novel Modified Petroresin Particle (MPRP) With Enhanced Oil–Water Selectivity for Cold Production in Heavy Oil Reservoirs

Advanced Functional Materials, EarlyView.
A novel oil–water selective conformance control agent, MPRP, is prepared via hydrophilic grafting and mechanical granulation. MPRP uniformly disperses in water, cohesively expands upon aging, and readily dissolves in the oil phase. During conformance control, it selectively aggregates in water channeling pathways to form effective plugs without ...
Guang Zhao, Dongfang Lv, Chang Liu, Changxu Wu, Yifei Liu, Caili Dai, Huazhou Li   +6 more
wiley   +1 more source

A new Flap-top window FFT algorithm for energy metering based on quasi-synchronous sampling

Diance yu yibiao
In order to further improve the accuracy of energy metering algorithms for standard electricity meters, this paper provides a comprehensive review of the principles and performance of quasi-synchronous sampling algorithms and fast Fourier transform (FFT)
ZHANG Zhiying, DU Zhengzhou, LI Longlong, LIU Jian, ZHAO Wei, LI Shisong   +5 more
doaj   +1 more source