The substantial voids of porous pavement materials permit light and exhaust pollutants to infiltrate a considerable depth. Consequently, utilizing mixtures as carriers for photocatalytic enables greater exposure an environment conducive the degradation reaction. This study employed asphalt cement concrete pavements. Various amounts TiO2 were incorporated photocatalysts produce eco-friendly with capability. Based on self-developed apparatus methodology, its performance was evaluated under...

Inspired by the "Salvinia effect", a novel method for fabricating magneto-responsive superhydrophobic surface coated with cluster-distributed cilia array (CC-MRSS) was reported. This features magnetically self-assembled nonuniform microcilia and demonstrates exceptional microdroplet hydrophobicity, magnetic-responsive wettability, corrosion resistance. The fabrication process involved mixing polydimethylsiloxane (PDMS) carbonyl iron powders (CIPs), followed dividing mixture into two parts....

A method of modeling and numerical simulation a brushless permanent-magnet dc motor using time-stepping finite-element technique is presented. In the proposed model, electromagnetic field equations, stator circuit equation, motion equation are solved simultaneously at each time step; thus, eddy-current effect, saturation rotor movement, nonsinusoidal quantities can all be taken into account directly in system equations. Dynamic conditions starting, step voltage variation, load torque changes...

A method to generate fractures with rough surfaces was proposed according the fractal interpolation theory. Considering particle-particle, particle-wall and particle-fluid interactions, a proppant-fracturing fluid two-phase flow model based on computational dynamics (CFD)-discrete element (DEM) coupling established. The simulation results were verified relevant experimental data. It proved that can match transport accumulation of proppants in well. Several cases numerical simulations carried...

Controlling the thermal conductivity of thermoelectric materials continues to be a goal for energy conversion applications. The Phonon Boltzmann Transport Equation is solved by using Discrete Ordinates Method numerically study phonon nano-structured silicon thin film with pores in this study. effects thickness, porosity, and porous structure are concerned. numerical results show that nano-pores able reduce sharply boundary scattering, scattering area has significant effect on conductivity....

The traditional power control schemes for induction heating device mainly focus on the pulse frequency modulation (PFM) and density modulation. But they cannot solve problems of control, efficiency, load-adaption well. This paper presents analyzes asymmetrical (AFM) scheme used in full-bridge series resonant inverter. With proposed AFM technique, output is controlled by two variables: operation division factor. Better efficiency performance can be achieved medium low range when compared with...

This paper presents a novel multiple-frequency resonant inverter for induction heating (IH) applications. By adopting center tap transformer, the proposed can give load switching frequency as twice isolated-gate bipolar transistor (IGBT) frequency. The structure and operation of topology are described in order to demonstrate how output is IGBTs. In addition this, IGBTs work zero-voltage during turn-on phase switches. new verified by experimental results using prototype IH Moreover, increased...

In the study, we introduced local mean free path of phonons with boundary effects. The thermal conductivity distribution from to film bulk region was obtained, and scattering effect examined by introducing a phonon Knudsen layer thickness. We calculated ratio effective one results are in agreement available data.

Permanent magnet synchronous motor (PMSM) has been widely applied in a pulse width modulation inverter‐fed adjustable speed drive (ASD) system. However, electromagnetic interference (EMI) become critical issue such Plenty of high‐frequency harmonic components, generated by high d v /d t or i the modern transistors, can be observed on line‐to‐line voltage across terminals. To study conducted EMI issues existed ASD system, an improved model PMSM is developed to represent behaviour, and...

The phonon Boltzmann transport equation with the frequency-dependent model is solved numerically to study thermal conductivity in nanoporous thin film and nanocomposite. Local angle between heat fluxes, defined as directions of flux component qx local q, introduced. At a fixed porosity or interface area, conductivity, distribution, average two-dimensional films circular, hexagonal, square, triangular pores are reported, decreases increase area porosity. Furthermore, relationship also...

Silicon carbide (SiC) metal oxide semiconductor field effect transistors (MOSFETs) are new generation of power devices with higher slew rates. During switching transient process, undesirable oscillations occurs in SiC MOSFET modules due to the parasitic elements, such as stray inductances and capacitances. Based on equivalent circuit models, this brief derives spectrum waveform ringing, investigates spectral bounds influence ringing content. Through LTSPICE simulation, comparison between...

This study presents a novel high‐frequency three‐phase permanent magnet synchronous motor (PMSM) model to predict the common‐mode (CM) current and CM voltage in pulse‐width modulation inverter‐fed adjustable speed drive systems. Parameters of are calculated based on measured impedance, applying vector fitting method. The model‐calculated impedance is compared with experimental 3 kW PMSM star‐winding connection, which has shown considerable accuracy at frequency range 100 Hz–10 MHz....

Silicon carbide (SiC) MOSFET has become a nice alternative to silicon (Si) IGBT and MOSFET. However, more serious electromagnetic interference (EMI) issues are brought by fast switching characteristics of SiC as well. In order understand the principle these EMI issues, an analytical model is proposed in this paper. With full consideration parasitic inductances non-linearities junction capacitances, describe transient Meanwhile, novel linear function used represent relationship between...

This paper concentrate on the numerical study and simulation experiment of bifurcation chaos in forward converter, which is different from previous investigated work DC-DC converter without power transformer. First, simplified model transformer built. Then, iterative map for derived. Based model, this provides stable condition. According to condition, we change parameters circuit, such as filter capacitor, inductance load resistance, investigate including time-domain waveforms, v-i phase...

The technologies for maintaining high recording density to suppress mechanical vibration and media flutter ultrahigh TPI hard disk drive (HDD) require advance spindle motor design technology against the traditional norms. To realize multimagnetic poles with limited stator slots, motors generally use concentrated windings which offer small end winding simple structure suitable mass production. There is a variety of ways construct different structures based on pole/slot combinations. Winding...