The quasi-Z source (qZS) cascaded multilevel inverter (CMI) (qZS-CMI) presents attractive advantages in application to photovoltaic (PV) power system. Each PV panel connects an H-bridge qZS (qZSI) form a generation module. distributed maximum point tracking and all modules' dc-link peak voltage balance can be achieved. However, it is the same with conventional CMI that second-harmonic (2ω) current ripples exist each qZSI It crucial for qZS-CMI design reasonable network parameters limit...

Due to the widespread use of mobile devices, it is essential authenticate users on devices prevent sensitive information leakage. In this paper, we propose TouchID, which combinedly uses touch sensor and inertial for gesture analysis, provide a based user authentication scheme. Specifically, TouchID utilizes analyze on-screen while using device's motion caused by gesture, then combines unique features from authentication. To mitigate intra-class difference reduce inter-class similarity,...

Multiple-port dc–dc converters are characterized by a variety of kinds and large number circuit topologies. In this article, we aim to reveal the intrinsic relationship among topologies multiple-port propose topology derivation method. First, voltage- current-type ports summarized from basic converters, approach converting into voltage-type is discussed. Then, according Kirchhoff's law, four types multiple-input multiple-output named input-port-series output-port-series,...

A space-shift phase-coherent cancellation acoustic metasurface is developed, which can achieve broadband low-frequency sound absorption via ultra-thin integrated structure composed of multiple units with weak capability. Through a design the channel length, large-size required in thickness direction for transferred into an extremely space layer. The gradient length are compactly arranged layer through folding, coplanar component working bandwidth exceeding octave and only λ/25 to λ/57...

The capacity and error probability of orthogonal space-time block codes (STBCs) are considered for pulse-amplitude modulation/phase shift keying/quadrature-amplitude modulation (PAM/PSK/QAM) in fading channels. approach is based on an equivalent scalar additive white Gaussian noise channel with a gain proportional to the Frobenius norm matrix STBC. Using this effective channel, expressions derived PSK/PAM/QAM coding. Rayleigh-, Ricean-, Nakagami-fading channels considered. As application,...

Industrial wireless sensor networks (IWSNs) have the potential to contribute significantly in areas such as cable replacement, mobility, flexibility, and cost reduction. Nevertheless, industrial environment that IWSNs operate is very challenging because of dust, heat, water, electromagnetic interference, interference from other devices, which make it difficult for current guarantee reliable real-time communication. In this paper, we present a novel method based on segmented slot assignment,...

This paper presents a transverse mode suppression theory and its experimental verification through aluminum nitride Lamb wave resonators (LWRs) operating at 142 MHz. An effective 2-D approximation model of the LWR is proposed, based on which origin modes in investigated. The displacement distribution, resonant frequencies, electromechanical coupling coefficients (k <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> <sub...

Abstract An interesting alternate attractor chimeralike state can self-organize to emerge on rings of chaotic Lorenz-type oscillators. The local dynamics any two neighboring oscillators spontaneously change from the butterfly-like attractors symmetric and converse ones, which forms ring. This is distinctly different traditional chimera states with unique attractor. effective driven-oscillator approach proposed reveal mechanism in forming this new oscillation mode predict critical coupling...

The properties of chaos time delay signature (TDS) in a ring network consisting three mutually coupled semiconductor lasers (MCSLs) are investigated numerically, where heterogeneous coupling delays proposed to obtain the TDS concealment from intensity wide parameter regions. evolution patterns, which quantified via autocorrelation function, for with identical as well that is compared. By analyzing effects strength, frequency detuning, and injection current on TDS, regions successful...

In this Letter, a single-cavity underwater acoustic metasurface unit with sub-wavelength thickness was designed for simultaneously realizing the high refractive index in water environment. By arraying several units gradient distribution radial direction, gradient-index three-dimensional planar lens constructed. Moreover, fewer to reduce size by nearly half original one while maintaining excellent broadband focusing capability unchanged. addition, adding back cavity on side of lens,...

<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> In this paper, the slow-scale instability in a boost PFC converter under average current mode control is studied via harmonic balance method and Floquet theory. Systematic general numerical algorithm of technique developed. The objective to identify system. If exists, type bifurcation boundaries parameter space system can be found for facilitating design such converters. Firstly, based on fact...

A novel Z-source dual-bridge matrix converter (ZSDBMC) topology and its control strategy are proposed to overcome two main drawbacks of conventional converters: low immunity abnormal input voltage disturbance transfer ratio. The boost characteristic network is utilized improve the system ratio make it immune with shoot-through duty cycle self-adjusted. Meanwhile, nonlinear PID controller employed eliminate effects caused by nonminimum-phase presented in dynamic performance robustness....

Multiple-input converters (MICs) and multiple-output (MOCs) are attractive solutions for interfacing various voltage levels. In order to reveal the intrinsic relationships among diverse topologies provide as many viable possible practical applications, this article aims analyze topology construction principles propose a systematic approach derive MICs MOCs. To begin with, general principle of derivation is analyzed according circuit network theory. Inspired by idea design controllable...

A novel active backstepping control method is presented for synchronizing two identical Rössler hyperchaotic systems with each other and extended to achieve the generalized synchronization of Chua chaotic system system. It a systematic design approach consists recursive procedure interlacing choice Lyapunov function control. In particular, this technique gives flexibility in constructing law. Numerical experiments verify feasibility effectiveness proposed technique.

For finned-tube heat exchangers, owing to the extremely different refrigerant pressure drop characteristics between condensation and evaporation processes, optimum circuits of these two conditions are different. However, for a typical pump type air conditioner, circuit conventional exchanger (CHX) is fixed no matter what operation condition conducted. To solve this problem, modified variable-circuit (VCHX) developed conditioner outdoor unit applications. The VCHX, which can be easily...

For most actual power applications, power-factor correction (PFC) converters usually operate in the stable continuous conduction mode (CCM), but input current distortion will occur as long these oscillatory condition. This manifests itself a local oscillation within one line cycle. Typically, Zeta PFC converter under general pulse-width modulated (GPWM) control possesses high performance, and requires simpler circuitry with fewer external components. However, due to large-signal nonlinearity...