Abstract Rearranging the electronic orbitals of metal sites through interface engineering is breakthrough for achieving high efficiencies in hydrogen/oxygen evolution reactions (HER/OER) on bimetallic catalysts. Here, via a multistep liquid‐phase synthesis strategy, crystalline‐amorphous (c‐a) built by coating amorphous oxyhydroxide layer surface crystallized copper(II) sulfide (CuS@MOOH, M = iron (Fe), cobalt (Co) and nickel (Ni)) with an internal cavity. For HER, c‐a facilitates electron...

Additive manufacturing (AM) is an emerging and promising technology. In this manuscript, attempt made to simulate AM process via molecular dynamics simulations. Amorphous Cu pillars are built by bundling melting wires parallelly one one, with a particular temperature-controlling procedure through the use of 'mediate temperature'. Thus, volume fraction amorphous phase becomes adjustable. Uniaxial tests conducted on after free relaxation. The mediate temperature found play profound role in...

With the frequent occurrence of drone-related criminal cases, drone forensics has become a hot spot concern. During investigations, implicated drones are often forcibly brought down, which poses significant challenges in conducting forensic analysis. In order to restore truth it is necessary extract data not only from external TF card but also internal chip memory forensics. To address this issue, parser (DRDP) proposed and criminal-implicated drones. paper, we present comprehensive on DJI...

In recent decades, size effects caused by grain size, strain gradient, typical defects etc., have been widely investigated. Nevertheless, the dependence of tensile strength on specimen length, addressed Da Vinci around 500 hundred years ago, has received rather limited attention, even though it is one unavoidable question to answer if people attempt bring materials’ amazing nano-scale strengths up macro-level. Therefore, we make efforts study behaviors copper nanowires with a common...

We have investigated the influences of high-frequency vibration (HFV) superimposed onto monotonic uniaxial tension in single-crystal aluminum (Al) specimens by molecular dynamics simulations. It was found that HFV induces softening, i.e., reduction peak stress. Similar to previous experimental results, softening increases with increasing amplitude. Dependences on lattice orientation, tensile strain rate, and a preset notch are considered. Lattice orientation plays an important role stress...

ABSTRACT Components in aero‐engine are likely excited multiple resonance models dynamic loads. This paper proposes an accelerated fatigue testing method that combines the vibration test with ultrasonic loading to develop a feasible experimental system for combined cycle (CCF) and explore CCF characteristics high (HCF) associated very (VHCF) conditions. A thin plate specimen of 7075‐T6 aluminum alloy two natural frequencies 2 20 kHz is designed experiment. The stress waveform distribution...

During the material accumulation process derived from deposit of molten particles after impacting, flattening, cooling and solidification, transient temperature variation directly affects splatting behaviors forming quality. The history has received considerable attention in this field. LabVIEW by National Instruments is a user friendly powerful graphical development environment for signal acquisition, measurement analysis, data presentation. In paper, acquisition measuring system based on...

The DC-DC converter for server power supply requires wide range of the input voltage and load variation, it ought to have long hold-up time when failure, therefore, this paper takes LLC Resonant Full-bridge Circuit as base topology design converter. Firstly, using First Harmonic Approximation (FHA) calculate resonant parameters converter, Extension Describing Function (EDF) establish small-signal model. Secondly, applying Fractional Order PID (FOPID) controller Particle Swarm Optimization...

This paper presents a comparative study between active liquid cooling methods for lithium-ion battery module using experimental techniques. Three Kokam Nickel Manganese Cobalt cells connected in parallel were tested two modules, one with coolant flowing along the edge of and another cells. For tests, modules placed thermal chamber at 20°C was circulated through chiller set to 20°C. Several characterization including resistance fast charging tests up 5C, drive cycle designed performed on...

Transient temperature rise calculation is necessary for electrical engineers to obtain the accurate cable core under cyclic current condition and manage power load. A lumped parameter transient thermal circuit model has been developed evaluate real-time of in ducts. The each divided into self-heating caused by heat this mutual-heating nearby other cables. Because it difficult calculate value parameters model, all are obtained with generic algorithm. fitness function difference between...

The Fleck-Hutchinson theory on strain gradient plasticity (SGP), proposed in Adv. Appl Mech 33 (1997) 295, has recently been reformulated by adopting the strategy of decomposing second order presented Lam et al. J Pays Solids 51 (2003) 1477. newly built SGP satisfies non negativity plastic dissipation, which is still an outstanding issue other theories. Furthermore, it explicitly shows how elastic gradients and corresponding characteristic length scales come into play general elastic-plastic...

Abstract With the rapid development of Internet, mobile communication is moving towards 5G era, and application intelligent systems in ascendant. The corresponding system forensics has become one research highlights. By comparing differences between traditional electronic data forensics, this paper studies specific content proposes a stage model which mainly included seven stages: formulation strategy, safe collection media/equipment, equipment protection before laboratory preparation...

In this study, we have employed molecular dynamics (MD) simulations to examine plastic mechanisms of a 'supra-nanometer-sized dual-phase glass-crystal' (SNDP-GC) high entropy alloy (HEA) composite under cyclic loadings. This is produced by embedding CoCrFeNi HEA crystalline grains into softer CoCrFeNiAl 2 glass. Cyclic loadings different amplitudes are applied on one polycrystalline sample and two SNDP-GC samples mentioned above. For the sample, dislocation motion grain boundary...