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Development of Space Charge Measurement System for Full-Scale Extruded Power Cables and its Application to Insulation Performance Evaluation
Get PDF豊橋技術科学大学博士（工学）doctoral thesi
A Holistic Evaluation Framework for Air-Front Smart Cities: Integrating Quality of Life and Quality of Business via Accessibility Modeling
Get PDFThis study introduces a novel concept of air-front smart cities, and an innovative framework integrating Quality of Life (QOL) and Quality of Business (QOB) concepts to evaluate urban policies and scenarios in Air-Front Smart Cities. These accessibility-based evaluation models examine the correlation and interaction between QOL and QOB, with a focus on sustainable urban development and decarbonization goals. By connecting transportation and digital accessibility to essential services and resources, the framework enables holistic assessments of urban ecosystems. Key QOL and QOB component indicators are identified and selected, tailored to startups and post-harvest agriculture, representing diverse economic sectors. The study links transportation planning with urban policy evaluations, focusing on human well-being, economic growth, and decarbonization, applying the framework to real-world cases in Japan (Aichi) and the Philippines (Baguio). The findings demonstrate the utility of the framework in optimizing urban policies to align economic growth, livability, and sustainability in Air-Front Smart Cities.journal articl
Calibration Method for Space Charge Measurement of Ultra-High Voltage Insulation Systems
Get PDF豊橋技術科学大学博士（工学）doctoral thesi
Highly conductive Na5YSi4O12 ceramic solid electrolyte by controlling Na deficiency in the precursors
Get PDFNa5YSi4O12 (NYSO) is known as a fast sodium-ion conductive oxide with both high ionic conductivity above 1 mS cm−1 at room temperature and excellent electrochemical stability against sodium metal anode, making it promising for solid-state sodium battery application. In this study, we investigated the influence of non-stoichiometry in the precursor composition on the crystal phase, microstructure and ionic conducting property of NYSO. It is found that NYSO prepared from the precursor with slight sodium-deficient composition showed the highest total (bulk + grain boundary) conductivity of 2.8 mS cm−1 at room temperature, which is superior to NYSO with stoichiometric precursor composition (∼ 1 mS cm−1). Although excess Na deficiency in the precursor results in the formation of Na3YSi3O9 phase, it does not influence so much on the sinterability and grain-boundary resistance of NYSO. Mitigation of Na9YSi6O18 phase formation during the fabrication is very important for the densification and reduction of grain-boundary resistance in NYSO ceramic electrolyte.journal articl
