Abstract Rational design of low‐cost, highly efficient, and stable electrocatalysts for the hydrogen evolution reaction (HER) has attracted wide attention. Herein, 3D RuCu nanocrystals (NCs) are successfully synthesized by a facile wet chemistry method, in which amorphous nanosheets directly grown on crystalline Cu nanotubes (NTs). Importantly, obtained NCs only need 18 73 mV to deliver current density 10 mA cm −2 HER alkaline neutral media, respectively. Density functional theory...

Traditional investment casting (IC), also known as lost-wax casting, suffers from high tooling cost and long lead-time during fabrication of wax patterns. In recent years, rapid (RIC) based on AM has become widely accepted in foundries due to production patterns without any requirements. Direct is not only cost-efficient for low volume but capable creating freeform highly complex geometries that are otherwise extremely difficult or too expensive cast conventionally. Such advantages provide...

To ensure the safety of concrete dams, a large number monitoring instruments are embedded in bodies and foundations dams. However, data often missing due to failure equipment, human error other factors that cause difficulties diagnosis dam precisely predict their deformation. In this paper, new method for imputing deformation is proposed. First, since traditional increment speed distance index similarity does not take into account fact there little change deformations occurring two...

Strip tillage is a widely used land preparation approach for effective straw management in conservation agriculture. Understanding the dynamic throwing process during stubble-crushing operation has important implications seedbed preparation. However, airflow generated by high-speed rotation of blades yet to be considered. We established coupled DEM-CFD simulation model and explored motion soil particles varied with their initial depth (at 0, 20, 40, 60, 80 mm depth) surface under different...

The constitutive models of concrete often consider water desorption isotherms to be near-equilibrium and significantly affected by moderately high temperature, 40–80°C, typically through microstructural changes. However literature data suggest that adsorption, not desorption, is moderate temperatures do cause This work supports the latter theory, dynamic vapor sorption experiments on cement paste at 20–80°C. Samples were pre-conditioned 60% relative humidity 20°C, measured for several ranges...

There is a significant increase in the number of people with dementia, and demand for residential support facilities expected to increase. Providing an appropriate living environment residents which can cater their specific needs crucial. Residential aged care design impact quality life wellbeing residents. In this investigation, three recently constructed dementia Victoria, Australia are selected evaluation. Through fieldwork observation, evaluation space syntax analysis, aim investigation...

The issue of reducing tillage resistance and lowering energy consumption has become increasingly relevant. Strip a positive impact on soil protection reduction. This study analysed the components rotary blades their relationship with operating parameters developed mathematical between (power fuel consumption). We summarised into three parts: air resistance, lateral rotational friction (divided horizontal vertical resistance), shear force. By theoretical analysis coupled simulation tests 11...

Modular prefabricated buildings effectively improve the efficiency and quality of building design construction represent an important trend in development industrialization. However, there are still many deficiencies technology existing systems, especially terms integration architectural performance defects that cannot respond to occupants’ comfort, flexibility, energy‐saving requirements throughout building’s life cycle. This research takes modular steel structural systems as its object...

This paper evaluates the performance of Hybrid Kanban Constant Work-In-Process control strategy and Basestock operating Shared Allocation Policy (S-KAP) Dedicated (D-KAP) in a multi-product serial flow line. We explored effect an increase product types on WIP inventory system. A simulation-based optimisation technique was used determining optimal settings for strategies. The strategies were compared via pairwise comparison Nelson's ranking selection procedure. S-KAP responds quicker to...

Deformation is the most intuitive indicator of actual working status a concrete dam. Zoning variation regulation dam deformation one key parts safety evaluation and risk assessment. However, sample points reflecting characteristic information are non-uniformly distributed, thus it difficult to cluster data samples by traditional clustering methods. To solve this problem, spatio-temporal zoning method considering non-uniform distribution monitoring proposed. Firstly, preprocessed utilized...

A two-stage pre-aging (T4P2) treatment was conducted on Al–Mg–Si alloy, in order to obtain a rapid bake-hardening response (BHR), and single-stage (T4P) carried out for comparison. Effects of the second-stage temperature mechanical properties precipitation characteristics alloy were systematically investigated using tensile test, micro-hardness measurement, differential scanning calorimetry (DSC) tests transmission electron microscopy (TEM). The BH value ranged from 90 MPa 114 after...

To the authors' knowledge, very few filtering reflectarray antennas have ever been reported until now. A single-layer circularly polarized antenna (CPFRA) is presented in this paper. The phase compensation element of proposed CPFRA design adopted with a novel high frequency-selective polarization rotation reflective surface (PRRS). realized through rotating PRRS around its center under illumination feed antenna. bandpass periodic mainly composed rectangular ring and metallic ground....

The sensor‐based dam health monitoring (DHM) systems of concrete‐faced rockfill (CFRD) are easily affected by environmental factors, which inevitably causes sensor fault, and the measured value its effect quantities is nonlinear unstable. application machine learning in preprocessing safety data very extensive, mainly including two parts: gross error elimination missing completion. In this paper, support vector regression (SVR), a typical algorithm, chosen to accomplish these tasks, while...

Hybrid Aerial-Aquatic Vehicle (HAAV), which is a hybrid of underwater gliders and fixed-wing drone, energy-efficient, highly maneuverable suitable for marine observation large scale high spatial resolution. In this paper, novel scheme proposed autonomously sampling multiple water columns in relative short time with long distance complex obstacles between each other using (HAAV). The exploits energy-efficient spiral-down motion to sample column, followed by the pull-up propeller into sky fly...

Although the similarity laws were widely used in impact fields, scaling relations of anisotropic elastic structures often broken when geometric distortion (not equal different spatial directions) and material (different materials for scaled model full-size prototype) considered. To overcome difficulty distortion, a directional framework laws, termed as oriented-density-length-velocity (ODLV) system, is proposed structure under loads. Different from previous law systems using scalar...

For the vibration control problem and potential energy harvesting performance of suspension system, this paper proposes an active/semi-active strategy based on electromagnetic damper (EMD). Therein, three-vector-based model predictive current (TV-MPCC) for permanent magnet synchronous motor (PMSM) is developed to achieve fast tracking given torque. Furthermore, torque converted actuator force by drive ball screw. Based four-quadrant operation characteristic PMSM, EMD flow state analyzed...

Abstract A comprehensive understanding of uncertainty sources in experimental measurements is required to develop robust thermochemical models for use industrial applications. Due the complexity combustion process gas turbine engines, simpler flames are generally used study fundamental properties and measure concentrations important species validate improve modeling. Stable, laminar have increasingly been nitrogen oxide (NOx) formation lean-to-rich compositions low-to-high pressures assess...