Abstract This study introduces a novel strategy to enhance the high‐temperature electrical performance of silicone elastomer (SE), while ensuring control over its thermal and mechanical properties for SiC device packaging insulation application. For same, ultra‐low‐content inorganic/organic SE nanocomposites are prepared tested (at room temperature 150°C) by grafting polyhedral oligomeric silsesquioxane (POSS) nanofillers doping organic semiconductors. It is found that POSS enhances SE's...

Abstract Super-resolution deep learning reconstruction (SR-DLR) is a promising tool for improving image quality by enhancing spatial resolution compared to conventional (DLR). This study aimed evaluate whether SR-DLR improves microbleed detection and visualization in brain magnetic resonance imaging (MRI) DLR. retrospective included 69 patients (66.2 ± 13.8 years; 44 females) who underwent 3 T MRI with T2*-weighted 2D gradient echo 3D flow-sensitive black blood (reference standard) between...

This paper reports the effect of DC and pulse wave voltages on space charge characteristics polyimide material for high-frequency insulation. The pulsed electroacoustic method is used to measure distribution inside under with different amplitudes, polarities, frequencies duty ratios. Comparative results show that positive more likely accumulate polyimide. amount accumulated larger than voltages. With frequency, negative a frequency above 50 Hz, while it not 100 Hz maximum distortion electric...

Image classification is extensively used in various applications such as satellite imagery, autonomous driving, smartphones, and healthcare. Most of the images to train models can be considered ideal, i.e., without any degradation either due corruption pixels camera sensors, sudden shake blur, or compression a specific format. In this paper, we have proposed novel CNN-based architecture for image degraded based on intermediate layer knowledge distillation data augmentation approach cutout...

In this study, we attempted to detect partial discharge occurring between motor winding using the pulsed electroacoustic method. recent years, our research group has been conducting space charge distribution measurements a voltage application method via spatial gap for measurement samples. To verify detection of method, conducted under atmospheric pressure and vacuum environments. As result, drift due was not detected environment, whereas it occurred initial roughly corresponded Paschen's...

<div class="section abstract"><div class="htmlview paragraph">For better understanding, model development and its validation of in-cylinder soot formation processes Gasoline Direct Injection (GDI) engines, crank-angle-resolved mass size distribution during a GDI combustion cycle were investigated via optical measurements total cylinder sampling technique in an optically accessible Rapid Compression Expansion Machine (RCEM). A direct-injection, spark-ignited single-shot event was...

In this paper, we propose the new measurement method for measuring electron-hole pairs which were generated by electron beam irradiation. High voltage was applied through vacuum gap to prevent injecting charges from electrode. addition, compared amount of pair flux beam. As a result, observed in system, and didn’t change

Previously, the pulsed electroacoustic method could not separate true charge and polarization at sample-electrode interface. This is because positional resolution of measurement device sufficient. In this study, we attempted to by applying a pulse voltage DC sample through an air gap. The formed dielectric polarization, so permittivity can be calculated measuring amount charge. Therefore, in paper, measured polymeric insulating materials with different relative when step as initial study. As...

Recent electrical insulation designs for power electronics under severe environments such as high radioactive rays are required the applications to altitude and/or radiation environments. Under above environments, deteriorations of materials used due charging concerned. With respect exposure high-energy charged particles protons, electrons, etc. gives rise charge accumulations that may induce dielectric BD (breakdown) and make inoperable. Therefore, in this paper, we report feasibility study...

Spacecraft are exposed by radioactive rays, such as highly energetic electrons, protons, and plasma. The surface insulating materials of spacecraft charged because being high energy particles. This charging phenomenon is one the origins an electrostatic discharge may lead to a fatal error during those operations spacecraft. For improvement reliability operation, we should understand charge accumulation phenomena based on actual conditions. Therefore, our group other researchers have tried...

The pulsed electroacoustic (PEA) method could not evaluate the polarization charge and true separately due to positional resolution of measurement system. In this study, we attempt distinguish them by applying voltage through vacuum gap. We used various polymer insulating materials with different relative permittivity as a sample clarify relationship between amount charge. results show that signal reflecting was observed at sample-vacuum interface, output intensity increased increase applied...

In this study, we measured the polarization charge induced by DC and AC voltages measuring space distribution using improved PEA method in order to investigate whether amount of changes with frequency applied voltage. As a result, found that frequency, indicating possibility characteristics permittivity method.

The charging and discharge for insulation materials exposed to the charged particles are cause of spacecraft operation anomalies. We investigated space charge distribution material during electron beam irradiation using non-contact type electrode simulate environment. It was observed that accumulation rapidly decreases related discharge.

The accumulation of space charge in insulating material and its effect on the discharge inception voltage are investigated by measuring distribution formed it applying a dc to through air gap. In previous study, was observed contacted electrodes. However, an actual usage, is applied Therefore, we attempted conduct measurement sample with As result, found that enhanced discharge.

In inverter-driven motors, there is a small air layer between the windings and also grounded metal casing, so voltage applied to winding coating insulation material through gap. Furthermore, partial discharge phenomenon observed in motor seems be possibly affected by space charge accumulation material. Therefore, we have recently developed measurement technique using pulsed electroacoustic (PEA) method, which sample capacitance. this paper, investigated whether improved PEA method can used...

It is concerned that the recent expansion of application environment power electronics to high-altitude and/or high-radiation environments will cause deteriorations insulation materials used in due charging caused by cosmic ray irradiation. With respect environments, exposure high-energy charged particles such as protons, electrons, etc. gives rise charge accumulations, which dielectric BD (breakdown) and make equipment inoperable, changes characteristics materials. Therefore, this paper, we...

In this paper, an accumulation of space charge in insulating materials and its effect on the discharge inception voltage were investigated by measuring distribution formed applying a dc to it through air gap. previous studies, accumulations observed them contacted electrodes. However, is applied material gap actual usage some for motor windings. Therefore, we conducted measurement sample with The results showed that as accumulates inside material, increases, decreases.

The increasing use of power electronics equipment in various operating environments has raised concerns about the space charge accumulation insulation materials, especially high-radiation environments. In order to ensure more robust reliability equipment, it is important have a better understanding phenomena materials. this study, we investigated estimation material properties related through transport simulation using machine learning. As results, inverse analysis technique for estimating...

In this study, in order to evaluate the insulation performance of spacecraft surface insulating materials when they are irradiated with electron beams under charged conditions, space charge distribution was measured using pulsed electroacoustic method by applying a DC voltage while irradiating them beams. As result, accumulation within material observed immediately after beam irradiation, occurring at positions corresponding calculated penetration depth electrons. Consequently, localized...