Results 71 to 80 of about 89,842 (301)
Linear and jump frequency changes of a signal in a room
Archives of Acoustics, 2014 The paper discusses the deformation of the instantaneous frequency of signals with linear and jump frequency changes propagating in a room. The instantaneous frequency deformation in a room has been compared on the basis of theoretical and experimental ...
R. RUTKOWSKI, E. OZIMEK
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, 2002 An adaptive approach to the estimation of the instantaneous frequency (IF) of nonstationary mono- and multicomponent FM signals with additive Gaussian noise is presented. The IF estimation is based on the fact that quadratic time-frequency distributions (
Boashash, Boualem +3 more
core +1 more source
A Skin‐Like Strain Sensor for Real‐Time Human Motion Detection
Advanced Functional Materials, EarlyView.A skin‐like strain sensor with exceptional flexibility and breathability enables real‐time human motion detection. It offers continuous ECG monitoring and gesture recognition, ensuring high durability and comfort. This innovative design is ideal for wearable applications, combining reliable performance with seamless integration into dynamic ...
Shiqi Song +5 more
wiley +1 more source
, 2009 Increasing penetration of distributed generation within electricity networks leads to the requirement for cheap, integrated, protection and control systems.
Burt, G.M. +2 more
core +1 more source
Ultrasmall High‐Entropy Materials: Nanoscale Effects, Synthesis, and Mechanistic Insights
Advanced Functional Materials, EarlyView.This review article focuses on sub‐10 nm high‐entropy materials that combine nanoscale design with complex compositions for next‐generation applications. ABSTRACT Ultrasmall high‐entropy nanomaterials (USHENMs, <10 nm) merge multicomponent chemistry with size‐dependent effects, forming a distinct class of materials with unprecedented properties.
Yueyue He +5 more
wiley +1 more source
Problem of the instantaneous sound frequency measurement
Archives of Acoustics, 2015 This paper presents a method for the measurement of the so - called quasi-instantaneous frequency of acoustic signals, which is an approximation of the instantaneous frequency defined on the basis of theoretical considerations.
Edward OZIMEK +2 more
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IEEE Access, 2020 Various time-frequency analysis methods have been employed for the vibration signal processing of rotating machinery under time-varying speeds. However, most methods suffer from time-frequency blurriness, particularly for signals experiencing fast ...
Zehui Hua, Juanjuan Shi, Zhongkui Zhu
doaj +1 more source
Research of Instantaneous Frequency Measurement Receiver
2020 Dynamics of Systems, Mechanisms and Machines (Dynamics), 2020 В данной работе рассматривается двухканальный МИЧ-приемник с двумя линиями задержки. Проведя математическое моделирование МИЧ-приемника, были получены зависимости СКО оценки частоты от задержки при различных соотношениях С/Ш на входе. Также получена зависимость вероятности ошибочного определения зоны неоднозначности, приводящей к увеличению СКО оценки ...
M. A. Kvachev +2 more
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Advanced Functional Materials, EarlyView.This work developed a smart Janus wood membrane integrating asymmetric wettability with built‐in electrical sensing for oil‐water separation. The membrane achieved > 99.5% separation efficiency and high flux by leveraging wood's natural anisotropic pore structure.
Kaiwen Chen +10 more
wiley +1 more source
Advances in Mechanical Engineering, 2020 An improved instantaneous frequency estimation algorithm for rotating machines based on a kernel-based fuzzy C-means clustering (KFCM) algorithm used in association with a spectral centroid algorithm is proposed in this study. The clustering algorithm is
Zhai Hua +4 more
doaj +1 more source