A review of environmental friendly green composites: production methods, current progresses, and challenges

In this work we formulate a generalized theoretical model to describe the nonlinear dynamics observed in combined frequency-amplitude modulators whose characteristic parameters exhibit a nonlinear dependence on the input modulating signal. The derived analytical solution may give a satisfactory explanation of recent laboratory observations on magnetic spin-transfer oscillators and fully agrees with results of micromagnetic calculations. Since the theory has been developed independently of the mechanism causing the nonlinearities, it may encompass the description of modulation processes of any physical nature, a promising feature for potential applications in the field of communication systems.

Combined frequency-amplitude nonlinear modulation: theory and applications

Fabrication of nano-In2O3 phase junction by pulse alternating current synthesis for enhanced photoelectrochemical performance: Unravelling the role of synthetic conditions

Recent advances on bast fiber composites: Engineering innovations, applications and perspectives

In many cases, the spectrum of the modulated signal is transferred to the low-frequency region, for example, when radio sound appears in active dielectrics or an acoustic signal appears on the beat frequency (the frequency of the change in the amplitude of the total signal) during information exchange signals from two ultrasonic sources. In the general case, the analysis of the process of converting the spectrum of a signal turns out to be a difficult task related to solving a system of nonlinear differential equations. In this case, the principle of superposition does not apply. Thus, the study and analysis of the signal with respect to simple methods, if the form of the current-voltage characteristic for the nonlinear element in the dynamic mode is the same as with a constant voltage in time (or in static mode). Consider the conversion of the spectrum when transmitting the amplitude-modulated signal to an active nonlinear element with nonlinear current-voltage characteristics. In the examples for the conversion of the signal spectrum, the amplitude-modulated signal and beats are considered. The use of amplitude modulation methods is necessary to transfer the signal spectrum to the low-frequency region. In this paper, we analyze the conversion of the signal spectrum to current when the amplitude-modulated voltage is applied to a nonlinear element. The carrier signal is presented in the form of harmonic trigonometric cosine functions.

Transformation of the Amplitude-Modulated Spectrum of a Signal on a Nonlinear Element

A rapid, facile, and environmentally benign strategy to electrochemical oxidation of metallic tungsten under pulse alternating current in an aqueous electrolyte solution was reported. Particle size, morphology, and electronic structure of the obtained WO3 nanopowders showed strong dependence on electrolyte composition (nitric, sulfuric, and oxalic acid). The use of oxalic acid as an electrolyte provides a gram-scale synthesis of WO3 nanopowders with tungsten electrochemical oxidation rate of up to 0.31 g·cm−2·h−1 that is much higher compared to the strong acids. The materials were examined as photoanodes in photoelectrochemical reforming of organic substances under solar light. WO3 synthesized in oxalic acid is shown to exhibit excellent activity towards the photoelectrochemical reforming of glucose and ethylene glycol, with photocurrents that are nearly equal to those achieved in the presence of simple alcohol such as ethanol. This work demonstrates the promise of pulse alternating current electrosynthesis in oxalic acid as an efficient and sustainable method to produce WO3 nanopowders for photoelectrochemical applications.

/pdf/electrochemical-synthesis-dependent-photoelectrochemical-16ajzxk9.pdf

Electrochemical Synthesis-Dependent Photoelectrochemical Properties of Tungsten Oxide Powders

Natural fiber reinforced biomass-derived poly(ester-urethane–acrylate) composites for sustainable engineering applications

Measurement of the modulation factor of amplitude-phase-frequency modulated oscillations

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Electrochemical Synthesis-Dependent Photoelectrochemical Properties of Tungsten Oxide Powders

Natural fiber reinforced biomass-derived poly(ester-urethane–acrylate) composites for sustainable engineering applications

Measurement of the modulation factor of amplitude-phase-frequency modulated oscillations