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Research on Metamaterial Technology for Microwave Wireless Power Transfer

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Research on Metamaterial Technology for Microwave Wireless P...

International Symposium on Antennas and Propagation (ISAP)

作者： Tsunayuki Yamamoto Takeo Kobashi Tamami Maruyama Department of Integrated Science and Technology National Institute of Technology Tsuyama College Tsuyama-shi Japan Advanced Electronics and Information System Engineering Course National Institute of Technology Tsuyama College Tsuyama-shi Japan Department of Production Systems Engineering Institute of Technology Hakodate College Hakodate-shi Japan

ISBN: (数字)9798350364774

ISBN: (纸本)9798350364781

In this paper, two technologies of metamaterial for microwave wireless power transfer are shown. One is a zeroth-order resonance for a microwave snow melting system, and another one is a focusing reflector for realizing of a highly efficient wireless power transfer space. A zeroth-order resonance leads a uniformed microwave heating and a flexibility of feeding in a snow melting system. Focusing reflector can make some electromagnetic hot and null points in a space. These are expected to be required technologies for highly efficient wireless power transfer.

关键词： Microwave antennas Microwave technology Electromagnetic heating Snow Focusing Wireless power transfer Resonance Metamaterials Electromagnetics Microwave propagation

Implementing Green Infrastructure for Urban Stormwater Management: A systematic Review to Identify Future Challenges for Japan

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SSRN 2023年

作者： Uchiyama, Shun Bhattacharya, Yasmin Nakamura, Hitoshi Course of System Engineering and Science Graduate School of Engineering and Science Shibaura Institute of Technology Fukasaku 307 Minuma-ku Saitama-shi Saitama-ken 330-0073 Japan Department of Planning Architecture and Environmental Systems Shibaura Institute of Technology Fukasaku 307 Minuma-ku Saitama-shi Saitama-ken 330-0073 Japan

In recent years, Green Infrastructure (GI) has been widely advocated as a measure against urban flooding due to urbanization and climate change. Decentralized small-scale GI in urban areas has been widely promoted as a measure for urban stormwater management for more than 20 years, mainly in Europe and the United States, and examples of its practice have gradually emerged in recent years. However, it is still a new concept in Japan and is pending wide-scale implementation. The purpose of this study is to identify the challenges and suggest a process of GI implementation for the purpose of urban stormwater management in Japan. This study consists of two phases: First, key factors and a basic process for GI implementation are identified based on the experiences of some countries (i.e., China, Australia, the United Kingdom, and the United States). Second, by comparing them with the current situation in Japan, we identified the challenges for GI implementation in Japan in the future. As a result, eight key factors, including "quantitative performance analysis", "land use policy/law", and "interdisciplinary approach/ watershed-scale stakeholder collaboration", were identified. Moreover, we propose a basic process for GI implementation with an interdisciplinary approach, which starts with "selection of GI implementation areas", followed by "determination of implementation strategy with technical and financial support to stakeholders", and "long-term operation". The most important part of the process is how to incorporate GI into the existing urban development strategy, taking into account the topographical and climatic characteristics, social challenges, urban planning systems, and existing stormwater management plans. © 2023, The Authors. All rights reserved.

关键词： Climate change

A Study on Giant Magnetostrictive Actuator for Interior Sound Control system of the Ultra-Compact Mobility: Fundamental Consideration on Formation of the Giant Magnetostrictive Phases Depending on Heat Treatment Condition

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A Study on Giant Magnetostrictive Actuator for Interior Soun...

International Conference on Electrical Machines and systems (ICEMS)

作者： Taro Kato Ryusei Naganuma Koki Bando Kentaro Sawada Wu Wenbao Ikkei Kobayashi Jumpei Kuroda Daigo Uchino Kazuki Ogawa Keigo Ikeda Ayato Endo Hideaki Kato Takayoshi Narita Mitusaki Furui Department of Mechanical Engineering Tokyo University of Technology Hachioji-shi Tokyo Japan Sustainable Engineering Program Graduate School of Engineering Tokyo University of Technology Hachioji-shi Tokyo Japan Course of Mechanical Engineering Tokai University Hiratsuka-shi Kanagawa Japan Course of Science and Technology Tokai University Hiratsuka-shi Kanagawa Japan Department of Mechanical Engineering National Institute of Technology (KOSEN) Numazu College Numazu-shi Shizuoka Japan Department of Electronic Robotics Aichi University of Technology Gamagori-shi Aichi Japan Department of Mechanical Engineering Hokkaido University of Science Sapporo Hokkaido Japan Department of Electrical Engineering Fukuoka Institute of Technology Fukuoka-shi Fukuoka Japan Department of Mechanical System Engineering Tokai University Hiratsuka-shi Kanagawa Japan

ISBN: (数字)9784886864406

ISBN: (纸本)9798350379105

An active noise control system using giant magnetostrictive actuator has been proposed as a countermeasure for interior noise of the ultra-compact mobilities, which is a new transportation tools. In this paper, as basic research toward the development of the proposed giant magnetostrictive actuator for active noise control, we conduct experiments on the material properties when terbium, dysprosium, and iron powder, which make up the giant magnetostrictive material, are mixed and the heat treatment conditions are changed. In this study, the heat treatment temperature was varied from $800^{\circ}\mathrm{C}$ to $1100^{\circ}\mathrm{C}$ in $100^{\circ}\mathrm{C}$ incrementsbased on the equilibrium state temperature of each material, and the heat treatment time was set in 30-minute increments from 1 hour to 3 hours. As a result, TbFe2 was confirmed after heat treatment at an electric furnace temperature of $1000^{\circ}\mathrm{C}$ for 3 hours, although its strength was insufficient.

关键词： Actuators Heat treatment Powders Temperature Magnetostriction Noise Terbium Iron Resistance heating Material properties

Optical Evanescent Field for Direct Observation of Sub-100nm Particle Motion on Glass Surface

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Optical Evanescent Field for Direct Observation of Sub-100nm...

Robotics, engineering, science, and Technology (RESTCON), International Conference on

作者： Panart Khajornrungruang Thitipat Permpatdechakul Keisuke Suzuki Aran Blattler Yutaka Terayama Daiki Goto Pipat Phaisalpanumas Natthaphon Bun-Athuek Amornphun Phunopas Dept. of Intelligent and Control System Faculty of Computer Science and Systems Engineering Mechanical Science and Technology Division Kyushu Institute of Technology Iizuka-Shi Fukuoka Japan Dept. of Interdisciplinary Informatics Graduate School of Computer Science and Systems Engineering Mechanical Information Science and Technology Division Kyushu Institute of Technology Iizuka-Shi Fukuoka Japan Dept. of Production and Robotics Engineering Faculty of Engineering King Mongkut’s University of Technology North Bangkok Bangsue Bangkok Thailand Dept. of Intelligent and Control System Graduate School of Computer Science and Systems Engineering Mechanical Science and Technology Course Kyushu Institute of Technology Iizuka-Shi Fukuoka Japan Dept. of Industiral Engineering Faculty of Engineering King Mongkut’s University of Technology North Bangkok Bangsue Bangkok Thailand Dept. of Mechanical Engineering Technology College of Industrial Technology King Mongkut’s University of Technology North Bangkok Bangsue Bangkok Thailand

To directly investigate the dynamic nanoscale phenomenon on the surface being processed in wet conditions such as precision polishing, and cleaning in semiconductor industrial, an optical method for visualization and observation of each sub-100 nm sized particle that is moving on an interface such as a silica glass surface by applying an evanescent field have been proposing. Subsequently, we developed an experimental apparatus equipped with an optical microscopy system for verifying the moving particle observation method in a laboratory scale. This article introduces some experimentally direct observation results of duplicated wet processes.

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Exploration of an Efficient Method for Removing Antibiotics from Water and Digested Sewage Sludge Using Fe(Vi): Kinetics and P Phytoavailability and Compostability in Treated Sludge

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SSRN 2023年

作者： Limmun, Warunee Ishikawa, Nao Maeda, Takeki Umeda, Takayuki Song, Jie Sasamoto, Makoto Umita, Teruyuki Ito, Ayumi Department of Frontier Matters and Function Engineering Graduate School of Engineering Iwate University Morioka020-8551 Japan Department of Engineering King Mongkut's Institute of Technology Ladkrabang Prince of Chumphon Campus 17/1 Chumko Pathio Chumphon86160 Thailand Course of Civil and Environmental Engineering Department of System Innovation Engineering Faculty of Science and Engineering Iwate University Morioka020-8551 Japan Department of Food Production and Environmental Management Faculty of Agriculture Iwate University 3-18-34 Ueda Morioka020-8550 Japan Technical Office Faculty of Science and Engineering Iwate University Morioka020-8551 Japan

Potassium ferrate (K2FeO4) containing hexavalent iron [Fe(VI)] is an environmentally friendly oxidant, which possesses strong oxidizing power to treat wastewater and sludge. Therefore, the present study investigated degradation of selected antibiotics, namely levofloxacin (LEV), ciprofloxacin (CIP), oxytetracycline (OTC), and azithromycin (AZI), in water and anaerobically digested sewage sludge samples using Fe(VI). The effects of different Fe(VI) concentrations and initial pH values on antibiotic removal efficiency were evaluated. Under the studied conditions, LEV and CIP were almost completely removed from water samples, following second-order kinetics. In addition, over 60% of the four selected antibiotics were removed from sludge samples using 1 g·L-1 Fe(VI). Furthermore, P phytoavailability and compostability of Fe(VI)-treated sludge were evaluated using different extraction reagents and a small composting unit. The extraction efficiency of phytoavailable P using 2% citric acid and neutral ammonium citrate was approximately 40% and 70%, respectively. The mixture of Fe(VI)-treated sludge and rice husk was self-heated in a closed composting reactor through the biodegradation of organic matter derived from the treated sludge. Therefore, Fe(VI)-treated sludge may be utilized as an organic material containing phytoavailable P for compost. © 2023, The Authors. All rights reserved.

关键词： Antibiotics

Exploration of an efficient method for removing antibiotics from water and digested sewage sludge using Fe(VI): Kinetics and P phytoavailability and compostability in treated sludge

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Chemosphere 2023年第1期336卷 139165页

作者： Limmun, Warunee Ishikawa, Nao Maeda, Takeki Umeda, Takayuki Song, Jie Sasamoto, Makoto Umita, Teruyuki Ito, Ayumi Department of Frontier Matters and Function Engineering Graduate School of Engineering Iwate University Ueda 4-3-5 Morioka020-8551 Japan Department of Engineering King Mongkut's Institute of Technology Ladkrabang Prince of Chumphon Campus 17/1 Chumko Pathio Chumphon 86160 Thailand Course of Civil and Environmental Engineering Department of System Innovation Engineering Faculty of Science and Engineering Iwate University Ueda 4-3-5 Morioka020-8551 Japan Department of Food Production and Environmental Management Faculty of Agriculture Iwate University Ueda 3-18-34 Morioka020-8550 Japan Technical Office Faculty of Science and Engineering Iwate University Ueda 4-3-5 Morioka020-8551 Japan

Potassium ferrate (K2FeO4) containing hexavalent iron [Fe(VI)] is an environmentally friendly oxidant, which possesses strong oxidizing power to treat wastewater and sludge. Therefore, the present study investigated degradation of selected antibiotics, namely levofloxacin (LEV), ciprofloxacin (CIP), oxytetracycline (OTC), and azithromycin (AZI), in water and anaerobically digested sewage sludge samples using Fe(VI). The effects of different Fe(VI) concentrations and initial pH values on antibiotic removal efficiency were evaluated. Under the studied conditions, LEV and CIP were almost completely removed from water samples, following second-order kinetics. In addition, over 60% of the four selected antibiotics were removed from sludge samples using 1 g L−1 Fe(VI). Furthermore, P phytoavailability and compostability of Fe(VI)-treated sludge were evaluated using different extraction reagents and a small composting unit. The extraction efficiency of phytoavailable P using 2% citric acid and neutral ammonium citrate was approximately 40% and 70%, respectively. The mixture of Fe(VI)-treated sludge and rice husk was self-heated in a closed composting reactor through the biodegradation of organic matter derived from the treated sludge. Therefore, Fe(VI)-treated sludge may be used as an organic material containing phytoavailable P for compost. © 2023 Elsevier Ltd

关键词： Antibiotics

Origin of precious opal revisited: Possible quick formation of precious opal

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Research Square

Research Square 2021年

作者： Okudera, Hiroki Takeda, Tetsuyoshi Course in Earth and Planetary Science Faculty of Geosciences and Civil Engineering Kanazawa University Ishikawa Japan School of Natural System Graduate School of Kanazawa University Ishikawa Japan

It has been well known that a sedimentary precious opal is composed of closely packed uni-size silica spheres with voids filled by an air or water, and that an interference among reflections from the boundaries of those spheres and filler yields play-of-colour (iridescence). So, occurrence of a play-of-colour means occurrence of natural selection in size of spheres, or suppression of further nucleation after initial outburst of spheres, during its formation process. We had been exploring the possibility if we can regard a Stöber process as an analogue of the formation process of precious opal. The key is the reason why variation in size is rarely found on both precious opal and Stöber colloid. To give a clue, we examined the internal structure of Stöber particles and how those particles were formed at very initial stage of the process. The answers for evenness in shape and size are a quick supersaturation of reactive silica species, consecutive formation of large and loose polymers by fast dehydration, and their quick aggregation as the initial burst of silica spheres in highly diffusive medium. These can be achieved in nature by quick but continuous decrease in temperature on "basic" (high pH) geothermal hot water moving upward through cracks in rocks. Sedimentary precious opal can thus be formed when such naturally occurring colloid is filtered by a permeable bed. © 2021, CC BY.

关键词： Spheres

Spatiotemporal Evolution and Influencing Mechanism of Urbanization and Ecological Environmental Quality in the Middle of China, 2000–2020

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SSRN 2023年

作者： Dong, Xinyu Xu, Kaijian Li, Wei Tian, Qingjiu Fan, Qingchu Fang, Siwen Shen, Jiayi Jia, Mengya Tian, Jia College of Surveying and Planning Shangqiu Normal University Shangqiu476000 China Henan Engineering Technology Research Center of Ecological Protection and Management of the Old Course of Yellow River Shangqiu Normal University Shangqiu476000 China School of Resources and Environmental Engineering Hefei University of Technology Hefei230009 China International Institute for Earth System Science Nanjing University Nanjing210023 China School of Instrumentation and Optoelectronic Engineering Beihang University Beijing100191 China

The coordinated development between ecological environmental quality and the urbanization process is key in enhancing regional sustainability. This study established a comprehensive regional spatiotemporal analysis and assessment framework that includes ecological environmental quality (EEQ) assessment, urbanization level (UL) evaluation, spatial correlation analysis, coupling coordination degree analysis, and impact factor analysis. Henan Province, China, was selected as the research area to comprehensively explore the spatiotemporal differentiation and influencing factors of the UL and EEQ from 2000 to 2020. The results indicate that during 2000–2020, the overall EEQ in Henan Province gradually improved with the average RSEI values increasing from 0.446 to 0.599, while the differences gradually diminished. During 2000–2020, the overall UL in the counties of Henan Province exhibited an upward trend. During 2000–2020, the coupling coordination degree values between EEQ and UL in the counties of Henan Province increasing from 0.469 to 0.580, approximately 89% of counties are exhibiting basic coordination or higher by 2020. The influencing factors of the coupling coordination degree between EEQ and UL in the counties of Henan Province varied significantly at different periods, with the demographic factor consistently acting as the prevailing determinant over the past two decades, its significance has been steadily increasing. And the economic factor shows a strengthening trend in its interaction with other factors. This research offers fresh perspectives and enhanced understanding for the comprehensive analysis of the coupled mechanisms between the regional ecological environment and urbanization. © 2023, The Authors. All rights reserved.

关键词： Remote sensing

Recovery of Phosphorus, Magnesium, and Potassium from Surplus Activated Sludge Using Existing Sludge Treatment Facilities and Thickened Primary Sludge

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SSRN 2022年

作者： Kamiyama, Yudai Shiraiwa, Takuya Ishikawa, Nao Takahashi, Shinji Sasamoto, Makoto Sasaki, Masayuki Watanabe, Toru Ito, Ayumi Division of Regional Development and Creativity Graduate School of Arts and Sciences Iwate University Ueda 4-3-5 Morioka020-8551 Japan Course of Civil and Environmental Engineering Department of System Innovation Engineering Faculty of Science and Engineering Iwate University Ueda 4-3-5 Morioka020-8551 Japan Graduate School of Engineering Tohoku University 6-6-11 Aramaki Aza Aoba Aobaku Sendai980-8579 Japan Technical Office Faculty of Science and Engineering Iwate University Ueda 4-3-5 Morioka020-8551 Japan Iwate Prefectural Sewerage Public Cooperation Higashi-Mirumae 3-10-2 Morioka020-0832 Japan Department of Food Life and Environmental Sciences Faculty of Agriculture Yamagata University Wakaba-machi 1-23 Tsuruoka997-8555 Japan

The separation of P, K, and Mg from surplus activated sludge (SAS) was investigated using existing sludge treatment facilities and the thickened primary sludge (TPS). P, Mg, and K were efficiently released from the SAS solid through anaerobic cultivation over 6 h after the addition of TPS to the SAS in an existing storage tank. Released elements were transferred from SAS to SL using an existing mechanical thickener. The addition of TPS and increased TS concentration in SAS increased the concentrations of P, K, and Mg in SL after anaerobic cultivation to 200, 58, and 37 mg/L, respectively. Moreover, the recovery of elements lowers the Mg content in the anaerobic digester and inhibits struvite formation. P in SL was recovered as a hydroxyapatite precipitate by adding CaCl 2 and NaOH solutions. The optimal pH and molar ratio of Ca to P were 9 and 1, respectively. However, Mg and K could not be precipitated together with P. © 2022, The Authors. All rights reserved.

关键词： Recovery