Induction motors are becoming crucial components in numerous industries. The daily usage of induction creates the demand for proper maintenance and slight fault detection to avoid serious damage motor shutdown Among various kinds faults motors, bearing failures, broken rotor bar short-circuit insulation failures most common. Thus, classification these attracting great attention. There conventional methods detecting such faults, as vibration method failure, self-organizing map case current...

Magnetic cores of passive components are required to have low hysteresis loss, which is dependent on the coercive force. Since it well known that force becomes zero at superparamagnetic regime below a certain critical size, we attempted synthesize Ni nanoparticles in size-controlled fashion and investigated effect particle size magnetic properties. were synthesized by reduction acetylacetonate oleylamine 220 °C with trioctylphosphine (TOP) as capping agent. An increase TOP/Ni ratio resulted...

Herein, we propose an analytical technique for use in designing a resistor capacitor (RC) snubber circuit suppressing ringing phase-leg configurations that are among the main components electric power converters. In our study, double pulse is used to examine effects of RC suppression because and configuration mechanisms same. First, high-frequency equivalent derived. Next, analytically designed by scrutinizing characteristic equations via root locus method. Prior using method, conducted...

Global energy shortage necessitates enhancing environmentally friendly and energy-saving technologies. This study demonstrates a smart thermal emitter (STE) with high visual transparency temperature-dependent emissivity to realize management in buildings or automobiles. The STE consisting of layered transparent conductive oxide (TCO), zinc sulfide (ZnS), thin vanadium dioxide (VO2) films was fabricated using the sputtering process. exhibited transmittance visible region owing extremely VO2...

Abstract In topological phases, localized edge states protected by the bulk number appear. This phenomenon is known as bulk-edge correspondence, which has been theoretically established in various systems including pumping. There have experimental works on states. However, direct observation of numbers remains challenging. Here, we experimentally observe both and Chern near phase transition a tunable electric circuit system. The admittance matrix system accurately engineered using variable...

We have developed a terahertz time-domain magneto-optical ellipsometry to deduce the effective mass, scattering time, density, and type (n or p) of free carriers independently. The parameters are derived from diagonal off-diagonal components complex dielectric tensor obtained by measurements Kerr effects under magnetic field 0.46 T using generalized Drude model. derivation these for n-type InAs wafers with different carrier densities is demonstrated. density dependence mass agrees well...

To achieve control of radiative emissivity a material, we propose and demonstrate vanadium dioxide (VO2)-based temperature-selective emitter. This emitter comprises layered VO2 thin W-doped with decreased metal-insulator transition temperature. Because metal–insulator–metal structure is realized only in the temperature range 46–61 °C, enhanced this range. We analytically calculated temperature-dependent spectra experimentally measured reflectance emissivity. Direct heat flux measurements...

Abstract Higher-order topological insulators are attracting attention from fundamental interest to fascinating applications, owing the properties with higher-order corner states. Breathing kagome lattice is a prospective platform which can support Here, we experimentally demonstrate that states supported in breathing consisting of magnetically coupled resonant coils. The winding direction each coil determined hold C 3 symmetry for triangle unit cell, enabling emerge In addition, and trivial...

Hyperbolic metamaterials (HMMs) with highly anisotropic metal nanowires exhibit unique optical properties arising from their extraordinary anisotropy. Although are often fabricated by embedding noble metals such as silver in an anodic alumina membrane dielectric host, the low melting point of limits utilization high-temperature applications, and there fabrication issues overfilling or discontinuous islands within host pores. Thus, a high for HMMs alternative techniques desired. In this...

TiN nanopillar was applied as a robust analytical substrate for the laser desorption/ionization mass spectrometry of various types analytes with wide range. Numerical simulation validated heat confinement effect pillar shape.

Suppressing parasitic ringing, unwanted oscillation caused by switching, sufficiently and reliably, is of great importance in wide bandgap semiconductor devices. RC-circuits inserted parallel with switching devices have been widely used to suppress such ringing power electronics circuits due simple configurations. However, short-circuit current would flow through lines if capacitors are broken. In this article, we show that can be damped an external RLC resonator implemented a bus bar. The...

We have newly developed a plating-free bumping process by Cu nanopaste with injection molded solder (IMS) technology. In the new process, pillars are fabricated filling photoresist openings followed pressure-free sintering. The in opening forms unique cup-shaped pillar after sintering due to evaporation of solution paste and aggregation nanoparticles. Molten is injected, IMS technology, into space created opening. layer then stripped for bump formation. this paper, we demonstrated...

The ability to sensitively detect trace quantities of substances is important in many practical applications. Herein, the use TiO2 nanopillar arrays, formed using oblique electron-beam deposition and thermal treatment at 800 °C, as substrates for laser desorption/ionization mass spectrometry (LDI-MS) reported. arrays effectively assist ionization various analytes, including small amino acids, a sugar, pesticides, peptides, proteins with molecular weights up 24,000. fabricated surface...

Scalable wavelength-selective solar absorbers with both high selectivity and thermostability are desired for efficient utilization of thermal energy. In this study, we present a refractory titanium nitride (TiN) moth-eye-like nanostructure, fabricated via oblique deposition, that provides solar-light absorptivity (0.9) low emissivity (0.17) at 100 °C under atmospheric conditions. The strong visible-light absorption the structure is complemented by Fabry-Pérot resonance broadens band into...

The demand for the condition monitoring of induction motors is increasing in various fields, such as industry, transportation, and daily life. Bearing faults are most common faults, many fault diagnosis methods have been proposed using artificial pitting factor cases. However, validity a method other kinds does not seem to be evaluated. Considering onsite scenarios possibilities this paper introduces scratches on outer raceways bearings. A study was performed detection several bearing that...

Topological artificial crystals can exhibit one-way wave-propagation along the boundary with wave being localized perpendicular to boundary. The control of localization such topological propagation is great importance for enhancing coupling or avoiding unwanted among neighboring boundaries toward integrated circuits. However, effect geometry on properties not yet fully clear. Here, we experimentally and numerically demonstrate valley-topological transport representative...

Motors arise as a heart of the mobility society, and wirelessly operated motors may improve our standard living. Wireless power transfer in kilohertz megahertz range has been extensively explored, finding various potential applications consumer electronics, electric vehicles, medical implants. However, stable operation powered remains challenging due to voltage fluctuations for occurring dynamic scenarios, e.g., rotating speed is varied. Here, we theoretically experimentally demonstrate...

A magnetically coupled three-coil system to have one transmitting and two receiving coils is considered. We show that the position of coil can be estimated from ratio received wave amplitudes its angular derivative when are strongly each other weakly coil, i.e., a Fano resonance phenomenon. mode theory developed elucidate midrange sensing mechanism, where inversely proportional coupling strengths at intrinsic frequency coils.

Induction motors play a crucial role in various industries owing to their high robustness. The demand for early fault detection is getting attention avoid serious damage the machines. Bearing most common failure induction and possibility of scratches has higher probability among classes bearing faults. Recently, effective diagnosis method considering progression orientation scratch by using machine learning algorithm have been reported. However, such faults with accuracy still required...

Abstract We have previously developed a novel plating-free bumping process using Cu nanopaste and Injection Molded Solder (IMS) technology. In the present study, we investigated further detail about microstructural mechanical properties of sintered nanoparticles formed into pillar shape. By analyzing cross-sections nanoparticle pillars in various conditions, clarified how sintering conditions affect features, including size numbers grains voids inside nanoparticles. addition, conducted shear...