Femtosecond double optical pulse experiments with nanosecond time delay were conducted in air. Terahertz pulses were generated from laser plasmas produced by the irradiation with the main pulses on shockwave excited by t ... more
This study investigated the dependence of ablation thresholds for Si on the incident angle of a P- or S- polarized XeCl excimer laser (0°, 15°, 30°, 45°, and 60°). As the incident angle increased, the ablation threshold ... more
Formation of Periodic Surface Structures on Semiconductors under Mid-Infrared Free-Electron Laser Irradiation
論文No: ページ数: 5 日付: 2023/10/02
著者: Shin-ichiro Masuno (Advanced Research Center for Beam Science, Institute for Chemical Research, Kyoto University), Masaki Hashida (Advanced Research Center for Beam Science, Institute for Chemical Research, Kyoto University/Research Institute of Science and Technology, Tokai University), Heishun Zen (Institute of Advanced Energy, Kyoto University)
キーワード : laser-induced periodic surface structures，laser ablation，mid-infrared laser，free-electron laser
In understanding the formation mechanism of laser-induced periodic surface structures (LIPSS), the dependence of the LIPSS formation threshold fluence F// on the material properties is crucial. In this work, the LIPSS ge ... more
In this laboratory, we have been studying the decomposition of methylene blue contained in aqueous solutions containing organic matter (methylene blue) when the solutions are atomized (misted) and irradiated with ultravi ... more
In recent years, research on the application of plasma treated water to agriculture or medicine has been actively carried out. For further application of plasma-treated water, it is desirable to understand the reaction p ... more
Development of Space Charge 2D-Simulation Technique for Composite Materials
論文No: ページ数: 2 日付: 2023/10/02
著者: 澤田 亨（三菱電機（株） 先端技術総合研究所），門脇 和丈（三菱電機（株） 先端技術総合研究所），宮路 仁崇（三菱電機（株） 先端技術総合研究所）
キーワード : 空間電荷，電荷輸送モデル，数値計算，有限要素法 space charge，charge transport model，numerical calculation，finite element method
When a high electric field is applied to an insulating material for a long time, space charge may be injected into the insulating material. Space charge distorts the electric field in the insulating material and reduces ... more
Developments of Inverters with Virtual Inertia Function which are Connected to Distribution Power Systems
論文No: ページ数: 4 日付: 2023/10/02
著者: 西田 悠介（東京電力ホールディングス（株））
キーワード : 配電系統，擬似慣性，インバータ電源 distribution power systems，virtual inertia function，IBR
To achieve carbon neutrality, variable renewable energy penetration will be desired. But installing the variable renewable energy invites decrease in the ratio of synchronous machines, because variable renewable energy i ... more
Study of Utilization of Demand-side Resources in Foreign Balancing Service Markets―Survey on Regulatory Systems and Business Cases of US, Germany and UK―
論文No: ページ数: 7 日付: 2023/10/02
著者: 山田 智之（（一財）電力中央研究所），坂東 茂（（一財）電力中央研究所）
キーワード : 需給調整市場，需要側資源，デマンドレスポンス，仮想発電所，海外事例 balancing service market，demand side resources，demand response，virtual power plant，foreign case study
It is necessary to understand the situation in Western balancing service markets where they established them ahead of Japan to extract future issues and suggestions for Japan's balancing service market. We took up PJM in ... more
Aged CVTs have been often used in substations, but the expected lifetime of CVTs is unclear, so that it is difficult to determine the appropriate renewal time. Therefore, in this paper, we focus on oil-impregnated paper ... more
This study proposes a new method to estimate the concentration of the furfural contained in the insulating oil of oil-filled transformer based on infrared spectroscopic spectrum of the insulating oil. In this study, firs ... more
In this paper, an education system for elementary and junior high school students to design analog LSI is proposed, and an analog LSI design course conducted using the education system is reported. In the proposed course ... more
In recent years, with the development of IoT, research and development of wireless sensor networks for monitoring has been advanced to monitor the condition of various devices in railway vehicles and notify train crews. ... more
Because hearing is restricted to one ear, people with unilateral hearing loss have difficulty in localizing sound sources and cannot recognize the direction of hazardous sounds, resulting in a delay in danger perception. ... more
In this paper, we analyze a generalized version of the Allan variance, referred to as a higher-order Allan variance, that can evaluate the frequency stability of multi-dimensional atomic clocks as a function of the measu ... more
Method to Generate Nori-tsukkomi Text by Considering the Context
論文No: ページ数: 2 日付: 2023/10/02
著者: 関 陽介（徳島大学）
キーワード : ユーモア生成，ノリツッコミ，対話システム making humor，nori-tsukkomi，dialog system
Dialog systems, providing users with quick and easy access to required information interactively, have been widely used in various fields such as airlines and online shopping sites. The formation of friendly relationship ... more
Analysis of Interference of Electromagnetic Noise in an Electric Compressor for Vehicle Air-Conditioning Systems with an Integrated Mechanical and Electrical Structure
Since a motor drive system contains an inverter (high-voltage circuit) and gate drive circuits (low-voltage circit) with a switching regulator, electromagnetic noise is generated in each of these two circuits, and noise ... more
The authors proposed a unidirectional isolated secondary-resonant single-active-bridge (SR-SAB) DC-DC converter. The proposed SR-SAB converter consists of an H-bridge circuit, a high-frequency transformer, and diode-rect ... more
For the purpose of reducing the electricity cost, we conducted a trial manufacturing of a device that switches the winding connection of a drive motor during operation, and performed a durability test on it. The contact ... more
To minimise the deterioration of acceleration/deceleration performance of railway vehicles under low adhesion conditions, various kinds of slip controls have been developed. However, the theoretical systematization of wh ... more
In recent years, environment perception systems have been developed to achieve autonomous operation of existing railways. To make the system reliable, fusing multiple sensor data is effective, and the sensors have to be ... more
In the fields of medical and sports science, it is required to evaluate muscle activity qualitatively and quantitatively. Currently, mechanomyogram (MMG) that can reflect the mechanical activity of muscle fibers is attra ... more
We have developed a low-power method of collecting sound and vibration in the ultrasonic band by applying the “bat detector”, which is used to detect bats by converting ultrasonic waves into low-frequency waves, to a wir ... more
In this study, the gas pressure dependence of optical and mechanical characteristics in reactive sputtered SiCO thin films for optical guided-wave pressure sensors was experimentally investigated. Thin films were fabrica ... more
This paper addresses monitoring human activity as a new way to use seismometers. We estimated the variation of the number of people running in the park by detecting the vibration associated with human steps using the per ... more
Artificial Neural Network (ANN) has achieved great success in many fields, such as image and voice recognition. Recently, ANN is also applied to solve inverse scattering problems, because of the advantages that it is abl ... more
In order to investigate the influence of charging cable arrangements on contact discharge waveforms, which is not specified in the IEC calibration environment of ESD generators, we measure contact discharge waveforms by ... more
To-achieve multi-band technology and MIMO (Multiple-Input and Multiple-Output) technology, technologies are needed to accommodate multiple frequency bands in the radio section to make the equipment more flexible and comp ... more
Trends in Mitigation of Grid Congestion using Distributed Energy Resources in Power System
論文No: ページ数: 4 日付: 2023/09/01
著者: 金子 曜久（早稲田大学），藤本 悠（早稲田大学），飯野 穣（早稲田大学）
キーワード : 配電系統，系統混雑，分散型エネルギーリソース distribution network，grid congestion，distributed energy resources
Recently, a utilization scheme of distributed energy resources (DERs) is discussed as a countermeasure for mitigation of congestion in distribution networks. This paper describes the technological trends in Japan and ove ... more
The paper proposes a method to select a power factor for an inverter of distributed power generation systems to keep appropriate voltage of a power system with the high penetration of inverter-interfaced generation. The ... more
