Silicone is a common dielectric elastomer material. Actuators made from it show excellent activation properties including large strains (up to 380%), high energy densities 3.4 J g−1), efficiency, responsive speed, good reliability and durability, etc. When voltage applied on the compliant electrodes of elastomers, polymer shrinks along electric field expands in transverse plane. In this paper, silicone synthesized area are tested under different fields. Pre-strain certain driving film...

In this letter, we propose an efficient hybrid sampling method for microwave component modeling and optimization. The adaptively chooses samples from global local to form a data set. are obtained using greedy-like exploit potential optimal solutions. chosen random with minimum distance rejection ensure the uniformity of in design space. set is used establish surrogate model artificial neural networks (ANNs), parameters by optimizing ANN model. A bandstop microstrip filter taken as example...

This communication presents a novel surrogate-assisted quasi-Newton enhanced global optimization (SA-QNEGO) algorithm. In this proposed method, the heuristic hypersphere sampling (HHS) method is used to obtain representative samples. The surrogate model built based on low-fidelity model. differential evolution (DE) designed optimize Finally, optimal design of high-fidelity obtained through space mapping procedure. algorithm verified two antenna examples including dipole with balun and an SIW...

We studied a typical failure model of Mooney-Rivlin–type silicone energy harvester, illustrated the allowable area under equal-biaxial and unequal-biaxial conditions, calculated generated in one cycle an designed new conducted its primary tests. When ratio between principal planar stretches p=1 (λ2=pλ1) material constant k=0.1 (C2=kC1), density by harvester is 6.81 J/g. think that these results can be used to facilitate design manufacture dielectric elastomer harvesters.

Yield optimization aims at finding microwave filter designs with high yield under fabrication tolerance. The electromagnetic (EM) simulation-based methods are computationally expensive because a large number of EM simulations is required. Moreover, the design usually requires several performance objectives to be met, which not considered by current for filters. In this paper, an efficient yield-constrained using polynomial chaos surrogates (YCOPCS) employed filters considering multiple...

Reconfigurable intelligent surfaces (RISs) are of potential use in wireless communication systems due to their ability perform beam steering, harmonic wave manipulation, and polarization conversion. However, the main challenge designing RISs is obtain electromagnetic (EM) responses, which time-consuming computationally prohibitive. In this work, an efficient modeling method proposed for fast evaluation reflection coefficient far-field patterns RISs. The utilizes microwave network theory...

Dual-atom catalysts featuring synergetic dinuclear active sites, have the potential of breaking linear scaling relationship well-established single-atom for oxygen reduction reaction; however, design dual-atom with rationalized local microenvironment high activity and selectivity remains a great challenge. Here we bisalphen ladder polymer well-defined densely populated binuclear cobalt sites on Ketjenblack substrates. The strong electron coupling effect between fully-conjugated structure...

Abstract The planning and effectiveness analysis of air-to-air missile interception missions is a key link to improve national air defence combat capability. In this paper, new type carrier-aircraft accompanying flight strategy designed, where the carrying missiles will not withdraw after entering battlefield, but continue accompany flight. Combining dynamic performance missiles, real-time tracking evaluation enemy target, kind improved particle swarm optimization method proposed, an...

Most existing microwave filter yield optimization methods target a small number of sensitive design variables (e.g., around 5). However, for many real-world cases, more than ten need to be considered. Due the complexity, quality and efficiency become challenges. Hence, new method, called filters based on surrogate model-assisted evolutionary algorithm (YSMA), is proposed. The fundamental idea YSMA construct single high-accuracy model offline, which fully replaces electromagnetic (EM)...

Global climate change has become a major environmental threat and development challenge facing humanity. Controllable nuclear fusion is globally recognized ideal solution for clean energy, but its required high-energy triggering conditions intense energy release prevent existing technologies from achieving safe, stable, long-term continuous operation. Here, inspired by the traditional Chinese firecrackers, we propose pulsed reaction flywheel storage multi-reactor relay operation to drive...

Microwave filters are indispensable passive devices for modern wireless communication systems. Nowadays, electromagnetic (EM) simulation-based design process is a norm filter designs. Many EM-based methodologies microwave have emerged in recent years to achieve efficiency, automation, and customizability. The majority of methods exploit low-cost models (i.e., surrogates) various forms, artificial intelligence techniques assist the surrogate modeling optimization processes. Focusing on...

Conventional single-ended traveling wave fault location methods, which commonly depend on partial features of wavefronts, may lead to failure, especially for weak-signal faults such as high impedance or zero-crossing and close-in faults. To tackle it, this article presents a method according the extracted panoramic full waveform (TWFW) in time-frequency domains. Firstly, two rules TWFW are probed, that is, wavefront arrival sequence is varied from sections, well frequency distribution...

<title>Abstract</title> Dual-atom catalysts (DACs) with synergetic dinuclear active sites, have the potential to break linear scaling relationship of well-established single-atom for oxygen reduction reaction (ORR); however, design DACs rationalized local microenvironment high activity and selectivity remains a blind area is great challenge. Herein, we reported bisalphen ladder polymer well-defined densely populated binuclear cobalt sites that in suit growth on Ketjenblack substrates...

Performance evaluation of optimization-based antenna design methods is essential. It desirable to develop an efficient test suite with characteristics structures replace the high computational cost electromagnetics (EM)-based evaluation. In this article, four typical antennas respect objectives based on EM <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$S$ </tex-math></inline-formula> -parameter...

Pixel antennas provide a straightforward method for antenna design that can meet given set of specifications. A key step in the pixel is optimization hardwire connections between pixels antenna. Due to very large number possible connection combinations, this needs be performed by heuristic algorithms. In work, sensitivity analysis proposed efficient antennas. approach, each individual perturbed turn obtain vector objective function. The at efficiently through use algebraic simplification...

As an alternative renewable energy, upgraded biogas by separating CH₄ and CO₂ can be used to replace natural gas in automobiles power grids.

Dielectric elastomers (Des) are a type of EAPs with unique electrical properties and mechanical properties: high actuation strains stresses, fast response times, efficiency, stability, reliability durability. The excellent figures merit possessed by dielectric make them the most performing materials which can be applied in many domains: biomimetics, aerospace, mechanics, medicals, etc. In this paper, we present kind electroactive polymer composites based on silicone constant. Novel DEs could...

An optimization approach for multiport pixel antenna design using <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">${N}$ </tex-math></inline-formula> -port characteristic mode analysis (CMA) and sequential feeding port selection is proposed. CMA utilized to characterize the maximum number of independent or orthogonal resonant modes that can be formed in limited space constrained by size antenna. Once...

Reconfigurable and programmable metasurfaces have shown promising potential in a variety of fields because their remarkable ability to control electromagnetic (EM) waves. However, the design metasurface elements requires extensive high-cost EM simulations obtain certain functionalities, limiting developments applications. In this work, we propose novel two-stage optimization framework active based on microwave network theory methods. proposed framework, low-cost multiport model is first...

In this paper, an expression for the permittivity of electro-active silicone undergoing large deformation with high particles filled uniformly has been proposed. Two expressions are proposed permittivity, one based on experimental tests and other theory composite material. By applying thermodynamic model incorporating linear dielectric nonlinear hyperelastic performance, mechanical performance electromechanical stability coupling system constituted by PMN–PT have studied. The results show...