A high-efficiency broadband acoustic energy harvester consisting of a compliant-top-plate Helmholtz resonator (HR) and dual piezoelectric cantilever beams is proposed. Due to the high mechanical quality factor strong multimode coupling HR cavity, top plate beams, efficiency in broad bandwidth obtained. Experiment exhibits that proposed at 170-206 Hz has 28-188 times higher than conventional using with composite diaphragm. For input pressure 2.0 Pa, 0.137-1.43 mW output power corresponding...

The seismic performance of superimposed reinforced concrete (RC) shear walls is decreased by rocking behavior and damage concentration at the horizontal joint. An enhanced joint method proposed to improve corresponding performance. To validate reliability method, three full-scale a cast-in-place wall (for comparison) are designed tested under quasi-static load. test results indicate that phenomenon can be prevented using RC with joints comparable walls.

In this work, graphene-oxide-decorated porous ZnO nanosheets were prepared using a hydrothermal method. The graphene oxide/porous nanosheet (GO/ZnO nanosheet) composites characterized with SEM, HRTEM, XRD, Raman spectroscopy, XPS and BET. results indicate that the have porous, single-crystal structure. Thin GO closely cover surface of nanosheets. sensing performance GO/ZnO is investigated. At optimized temperature 300 °C, exhibit superior in n-propanol detection. wide range 5–200 ppm, linear...

In this work, the Mn-doped copper (II) oxide (CuO) nanoflower spheres (CuO-1% Mn spheres) are synthesized through a facile low-temperature hydrothermal method. The as-prepared sample is characterized by X-ray powder diffractometer (XRD), scanning electron microscope (SEM), transmission (TEM), energy dispersive spectroscopy (EDS), photoelectron (XPS), Raman and Brunauer–Emmett–Teller (BET) analysis. results indicate that with diameters of 5– <inline-formula...

To assess the energy saving and emission reduction effects of recycling technology, quantitative analysis consumption carbon recycled asphalt pavement is conducted mixture production, transportation, paving compaction. Firstly, calculation model for emissions established during construction stage. In addition, four technologies, including HCPR, HIR, CCPR CIR, were compared. Finally, FCE method used to evaluate actual effect from perspectives ecological benefit economic benefit. The research...

Hydrotalcite is an abundant mineral in nature and can be cost-effectively prepared the laboratory, but there almost no discussion about its application field of supercapacitors. Herein, hydrotalcite-like ternary NiMgAl LDHs with unique ultrathin nanosheets were designed fabricated by a facile hydrothermal method. The preparation conditions, such as Ni/Mg molar ratio reaction time, are evaluated carefully. physical chemical properties also various characterization techniques XRD, FIB/SEM,...

A high-Q cross-plate phononic crystal resonator (Cr-PCR) coupled with an electromechanical Helmholtz (EMHR) is proposed to improve acoustic wave localization and energy harvesting. Owing the strongly directional wave-scattering effect of corners, strong confinement waves emerges. Consequently, Cr-PCR structure exhibits ∼353.5 times higher Q value ∼6.1 greater maximum pressure amplification than (Cy-PCR) (consisting cylindrical scatterers) same size. Furthermore, harvester using EMHR has ∼22...

This paper presents an electric current sensor employing unsymmetrical magnetoelectric composite Metglas/Pb(Zr,Ti)O <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> (PZT) consisting of magnetostrictive Metglas and piezoelectric PZT. As the foils with excellent magnetic characteristics induce field around a current-carrying cable, output voltage is generated in Metglas/PZT. The influence numbers foil (L) on resonance (V...

The superimposed reinforced concrete wall in which both the walls and slabs are semi-precast components has been widely used to construct high-rise residential buildings some seismic regions of China. This article aims investigate performance reveal inherent damage mechanism this wall. Quasi-static tests two full-scale with I-shaped cross sections, consisting orthogonal directions T-shaped cast-in-place boundary elements, were conducted. Through test, behavior horizontal joints between...

Giant self-biased converse magnetoelectric (CME) effects with obvious hysteretic behaviors are systematically investigated in two-phase SmFe2/PZT [Pb(Zr1−x, Tix)O3] multiferroic laminates at room temperature. Taking advantage of the huge anisotropic field SmFe2 plate, large remnant CME coupling is provoked by this instead permanent magnets to bias laminate. Consequently, bitable magnetization status switching realized through a smaller ac voltage far below electric coercive absence magnetic...

Precast concrete sandwich panels (PCSPs) have been extensively used as a facade wall in buildings to improve thermal efficiency. The connectors that link the two wythes are mainly for in-plane shear transfer. In this study, cross-shaped glass-fibre-reinforced polymer with different section areas proposed, aim of achieving optimal performance and easy construction PCSPs. First, pull-out capacities were evaluated. Then four PCSPs reinforced solid panel counterparts fabricated tested under...

Cold recycling technology is a widely applied asphalt pavement rehabilitation technology. The properties of emulsified residues after water evaporates play an important role in the performance pavement. This paper investigates rheological and fatigue under different evaporation methods. Two matrix binders emulsifiers were selected to prepare asphalt. Moreover, direct heating method (DHM) EN13074 ASTM D7497‐09 methods used obtain residues. Furthermore, linear viscoelasticity, permanent...

In order to study the mechanical properties and effect of a regenerant on cold recycled mixture with asphalt emulsions (CRMEs), moisture susceptibility, high-temperature performance, low-temperature dynamic durability CRMEs were analyzed evaluated by immersion splitting strength tests, freeze-thaw rutting semi-circle bending uniaxial compression modulus tests indirect tensile tests. Scanning electron microscopy (SEM) was used analyze micromorphology modified regenerant. Finally,...

Tuning band structures of a magneto-mechanical phononic crystal (PnC) (containing elastic plates bonded with magnets) is demonstrated by applying small static magnetic field (Hdc). Due to torque effect, the markedly altered coupling between Bragg scattering (related lattice constants) and local resonances occurs. Consequently, significant tuning observed under greatly Hdc. Experiments show that an additional passband occurs in when Hdc ≥ 130 Oe. This threshold (130 Oe) ∼1/100 as large...

In present work, the hierarchical CuO hollow microspheres were synthesized through a facile hydrothermal method. The as-prepared samples characterized by X-ray diffraction, scanning electron microscopy and transmission microscopy. results show that with uniform size of 3 μ m are self-assembled hundreds primary nanorods diameters about 20 nm. wall thickness is 200 exhibit good sensing performance in H 2 S detection. optimal operating temperature 180 °C. And, large range, display excellent...

The high-temperature rheological properties of emulsified asphalt mastics have a significant impact on the service performance cold recycled mixtures with emulsions. In this paper, dynamic shear (DSR) test and multiple stress creep recovery (MSCR) are carried out to analyze influence tunneling coal gangue powder (TCGP), portland cement (PC), limestone (LP), four kinds filler binder ratio (F/B) before after rolling thin film oven (RTFOT) ageing. Based principle time–temperature equivalence...

We reported a giant self-biased converse magnetoelectric (CME) effect in laminated composites consisting of gradedmagnetostrictive FeCuNbSiB/FeGa/FeCuNbSiB layers sandwiched between two electro-parallel-connected PZT piezoelectric plates. The great different magnetic characteristics (such as permeability and coercivity) FeGa nanocrystalline foil FeCuNbSiB result large internal field remanent piezomagnetic coefficient FeCuNbSiB/FeGa/FeCuNbSiB, which account for the CME effect. experimental...

Accurately evaluating and characterizing the performance of emulsified asphalt is basis its application. The rheological properties modified residues material action mechanism were studied. To achieve this goal, styrene butadiene (SBS)- rubber (SBR)-modified prepared, prepared by direct heating method (DHM) two low-temperature evaporation methods (EN13074 ASTM D7497-09). Then, fatigue resistance characterized through dynamic shear rheometry tests. Finally, Fourier transform infrared...

Ethylene is the most common ripening phytohormone in fruits, and excess ethylene can overripen fruit. However, in-field detection of still limited. In this work, ultrafine Pd nanoparticles-decorated porous ZnO nanosheets (UPNP nanosheets) were conveniently synthesized through a facile solvent reduction method. The UPNP characterized using scanning electron microscopy, transmission energy dispersive spectrum, X-ray diffraction photoelectron spectroscopy. uniformly coated with nanoparticles....