Abstract Artificial intelligence (AI) holds immense promise for K-12 education, yet understanding the factors influencing students’ engagement with AI courses remains a challenge. This study addresses this gap by extending technology acceptance model (TAM) to incorporate cognitive such as intrinsic motivation (AIIM), readiness (AIRD), confidence (AICF), and anxiety (AIAX), alongside human–computer interaction (HCI) elements like user interface (UI), content (C), learner-interface...

Abstract Alloy catalyst is considered to be an important strategy solve the shuttle effect and sluggish kinetics of lithium‐sulfur batteries (LSBs). However, electronic structure alloy on sulfur conversion process has not been effectively analyzed. In this paper, based alloying strategy, such a FeCoNi regulated optimized, adsorption configuration catalytic are defined. The in situ Raman spectroscopy density functional theory (DFT) employed deeply understand mechanism conversion. A cell with...

Due to the critical characteristics and magnetic flux pinning phenomenon of high-temperature superconducting (HTS) material, electromagnetic calculation for HTS motor is more complicated than conventional motors. In this paper, equivalent electrical conductivity permeability are proposed represent phenomenon, respectively. Considering low-speed single-sided linear induction as an example, 2-D mathematical model established its boundary conditions given. The solved using time-step...

For surface mounted permanent magnet synchronous motor (PMSM), due to the large rotor rotational centrifugal forces, a sleeve is often used prevent damage magnets. However, eddy current losses appearing in can increase temperature of PMSM. If heat dissipation condition poor, high influence PMSM performance and even result thermal demagnetisation Thus, scheme designed with low loss very necessary. In this study, taking 12.5 kW, 2000 rpm 0.2 mm thickness stainless steel as an example, first,...

Out-of-phase synchronization (OPS) fault may occur to the turbine generator used in gas-steam combined cycle units, which seriously endanger operation stability of unit. To investigate influences rotor structure on field current and electromagnetic a under OPS, 2-D field-circuit-grid coupled model (FCGCM) 150-MW is established. By using established FCGCM, slot indexing number (RSIN) magnetic permeability wedge OPS 180° were studied. A no uniform coefficient (MNC) was proposed evaluate...

For permanent magnetic motors, the faults in inverter may cause serious mechanical vibration, winding overheating, and thermal demagnetisation for magnets. Thus, this study addresses problem of electromagnetic field temperature distributions magnet synchronous motor (PMSM) under open circuit fault (OCF) upper switch one phase. Firstly, taking a 12.5 kW 2000 r/min PMSM as an example, 2D transient field‐circuit coupling calculation model is established. Then flowing paths three‐phase currents...

The prism-like bimetallic (Ni–Co) alkaline carboxylate was successfully constructed as sensor based on an enzyme-free electrochemical platform towards glucose detection.

Population size is closely related to economic and social development change. It one of the primary essential elements overall urban planning formulate a population strategy scientifically through projections. Therefore, we propose an prediction model based on multi-objective lioness optimization algorithm system dynamics. The used optimize some critical parameters dynamics reduce subjectivity construction. Taking Xi'an as example, validity verified, from 2019 2050 predicted by model. In...

A scale-up model for photoreactors based on a comparative study of the photocatalytic efficiency suspended and immobilized systems was developed. The is independent reactor size configurations, it assumes that same when normalized per unit illuminated catalyst area in both systems. In all cases, phenol/TiO2 (Degussa P25) selected as photodegradation system. First, kinetic built an system corresponding experimental data, then predicted rates phenol degradation were calculated using above...

Abstract A series of Cu‐WO x ‐TiO 2 catalysts for heterogeneous catalysis with different molar ratios copper and tungsten species loadings were prepared by modified evaporation‐induced self‐assembly method. Their physical chemical properties characterized X‐ray diffraction, liquid N sorption, Py‐IR, Raman, inductive coupled plasma, photoelectron spectroscopy, scanning electron microscope‐energy dispersive spectroscopy transmission microscope techniques, their catalytic performances...

Urban carsharing schemes provide flexible, affordable and green mobility services where customers can pick up a car from one station return it to the same (round trip) or any other in car-sharing network (one-way). While one-way service offer higher degree of flexibility customers, may cause operational challenges such as fleet unbalance between multiple rental outlets increased management costs. Due this, operators employ various vehicle relocation techniques ensure availability sufficient...

For line start permanent magnet synchronous machines (LSPMSMs), the eddy current loss in rotor, which has of significant effects on rotor working temperature, may cause thermal demagnetization to magnet. Therefore, this paper addresses an investigation temperature distribution LSPMSM based a 6 kV, 315 kW prototype with solid starting cage bar. Firstly, distributions, obtained from 2-D transient electromagnetic field calculation, are determined as distributed heat source analyses. Then,...

Flywheel energy storage system (FESS) has been widely used in many fields, benefiting from the characteristics of fast charging, high density, and clean energy. Uncontrollable discharging can be some special occasions which doesn't have strict requirements on power quality, such as electric heaters, emergency supplies, etc. Taking a charging (C&D) 200 kW 15000 rpm high-speed Permanent Magnet Synchronous Motor/Generator (PMSM/G) for FESS an example, field-circuit coupling calculation model...

In order to reduce the cost of titanium alloys, a novel low-cost Ti-3Al-5Mo-4Cr-2Zr-1Fe (Ti-35421) alloy was developed. The influence heat treatment on microstructure characteristics and mechanical properties new investigated. results showed that Ti-35421 consists lamina primary α phase β after solution at + region. After aging treatment, secondary precipitates in matrix. precipitation is closely related parameters-the volume fraction size increase when increasing temperature or time. At...

We investigate two coupled oscillators, each of which shows an attracting heteroclinic cycle in the absence coupling. The cycles are nonidentical. Weak coupling can lead to elimination slowing-down state that asymptotically approaches for a single cycle, giving rise either quasiperiodic motion with separate frequencies from or periodic synchronized. synchronization transition, occurs via Hopf bifurcation, is not induced by commensurability but rather disappearance weaker frequency...

This article concentrates on the steady-state thermal characteristics of Axial-Radial Flux-Type Permanent Magnet Synchronous Motor (ARFTPMSM). Firstly, three-dimensional mathematical models for electromagnetic calculation and analyses are established, machine loss, including stator armature winding rotor axial structure loss is calculated by using time-step Finite Element Method (FEM). Then, distribution assigned as heat source calculation. Secondly, model also established. The assumptions...

We study the decay of Fourier modes solutions to two-dimensional Navier–Stokes System on a flat cylinder and unit square with slip boundary conditions. Under some suitable assumptions initial velocity, we obtain quantitative estimates modes.

A method of photocatalytic process intensification, which can be easily used for efficient photoreactor design, inspired by the mechanism natural photosynthesis was developed and possible proposed. Four model compounds (phenol, Cr(VI), acid orange 7 p-nitrophenol) with different reaction mechanisms, using a Kenics static mixer, were selected to perform experiments validation. Experimental results showed that mixer intensify indirect radical-mediated reaction, but had no effect on direct...

Genetic algorithm as intelligent optimization, There are important applications in many field, The genetic is applied to the tuning of PID parameters dynamic positioning ship, First, In this paper, a model three degree freedom ship motion and ocean environment disturbance wind, wave current established, Secondly, control system is, Difficulties debugging parameters, This paper focuses on use optimize To achieve purpose optimizing PID, Last, optimization simulated, Through analysis simulation...

Hydraulic pump direct control hydraulic cylinder has an advantage for the simplified structure and energy-saving. Whether it can be used servo system become one of hot issues current research. This paper analyses composition digital pump-control symmetrical position system, working principle performance, which establish simulation modeling analysis in AMEsim. The results showed that work well meets technical requirements engineering application using PID control; coefficients under condition...