研究者詳細 - 長尾　征洋

機械学習モデルを用いた画像認識による建設資材ストック推計

Two-stage electrolysis of H2O and CO2 to methanol: CO2-to-methane reduction at the cathode and subsequent methane-to-methanol oxidation at the anode 査読有り

Hibino Takashi, Kobayashi Kazuyo, Nagao Masahiro, Dongwen Zhou, Siyuan Chen

JOURNAL OF MATERIALS CHEMISTRY A 10 巻 ( 42 ) 頁： 22718 - 22729 2022年11月

長尾征洋, 竹内詢喜, 玉崎美結, 森田大登, 北栄輔, 白川博章, 谷川寛樹

土木学会論文集Ｇ（環境） 78 巻 ( 6 ) 頁： II_19 - II_25 2022年

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：公益社団法人土木学会

都市部における建設資材ストックを把握することは資源のリサイクルや適正処理のために重要である．正確なストック推定には建築物構造を推定する必要があるが，既往研究では近年増加しているカーテンウォールを備えた鉄骨造は分類されてこなかった．本研究では機械学習モデルを用い建物壁面画像からガラスと壁を判定し，各ピクセル数から壁面ガラス率を算出した．このガラス率67％を閾値として判別に用いるとカーテンウォールを備えた鉄骨造を適切に分類できることが分かった．名古屋駅周辺の262棟を対象に建物構造を分類しストック推計を行った結果，従来の分類方法と比較してコンクリートは18%減少，鋼材は325%増加することが示された．

DOI： 10.2208/jscejer.78.6_ii_19

Ionic conductive and photocatalytic properties of cementitious materials: calcium silicate hydrate and calcium aluminoferrite 国際共著

Nagao, M; Kobayashi, K; Jin, YC; Maruyama, I; Hibino, T

JOURNAL OF MATERIALS CHEMISTRY A 8 巻 ( 30 ) 頁： 15157 - 15166 2020年8月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Journal of Materials Chemistry A

Few studies have reported the ionic conductive and photoactive properties of cementitious materials, owing to the compositional and structural variations of cement paste. The present report focuses on calcium silicate hydrate (C-S-H) and tetracalcium aluminoferrite (C4AF), prepared individually from pure constituent elements. C-S-H is an ionic conductor with a conductivity ranging from 10-4 to 10-3 S cm-1 in humidified air at temperatures between 60 and 100 °C. The hydroxide ions present in the mesopores of C-S-H as basic O-H groups were determined to be the major charge carriers, and the faradaic efficiency for the water oxidation reaction was estimated to be approximately 100%. C4AF is a mixed ionic n-type electronic conductor, particularly at high oxygen partial pressures. The conductivity of this compound was several times lower than that of C-S-H under the same humidity and temperature conditions, not only because of the bulk resistance but also the grain boundary resistance. C4AF and the hydrates exhibited photovoltaic and photocatalytic responses for water splitting and methylene blue degradation, respectively. These results indicate the important contribution of C-S-H and hydrated C4AF to the electrochemical and photochemical properties of cement paste.

DOI： 10.1039/d0ta04866f

Fuel cell and electrolyzer using plastic waste directly as fuel

Hori, T; Kobayashi, K; Teranishi, S; Nagao, M; Hibino, T

WASTE MANAGEMENT 102 巻頁： 30 - 39 2020年2月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Waste Management

The effective utilization of plastic waste, including its use as an energy or chemical resource, has attracted much attention. Nevertheless, energy recovery from plastics via incineration generates air pollutants and toxic compounds, while chemical conversion requires significant energy inputs, especially in the case of gasification. Herein, we report the electrochemical conversion of plastics into electricity or hydrogen without the use of special procedures. When a mixture of plastic solid combined with an acidic solution was fed into an electrochemical cell, the solid was found to dissolve in the solution at 100 °C or higher, followed by the release of protons from the anode to the cathode according to a multi-electron oxidation reaction. This oxidation reaction required an anode that was sufficiently porous so as to allow transport of the reactants. Taking the sponge sample as an example, the dissolved polyurethane had a molecular weight of 2000 or higher, the transport of which was facilitated using a carbon support with a pore diameter of approximately 10 nm. In addition, carbon black having an ordered porous structure exhibited better reagent transport compared to a disordered porous carbon black with similar pore diameters. As a consequence, this cell continuously provided power densities on the order of mW cm−2 in the fuel cell mode and generated hydrogen at a low cell voltage of 0.55 V in the electrolyzer mode, using plastics as fuels at an operational temperature of 200 °C.

DOI： 10.1016/j.wasman.2019.10.019

PubMed

A Cellulose Electrolysis Cell with Metal-Free Carbon Electrodes 国際共著

Li, YR; Nagao, M; Kobayashi, K; Jin, YC; Hibino, T

CATALYSTS 10 巻 ( 1 ) 2020年1月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Catalysts

Biomass raw materials, including agricultural residues, collected weeds, and wood chips, are important feedstocks for hydrogen production. Numerous attempts have been made to electrolyze biomass directly or indirectly to hydrogen because these processes allow for the production of hydrogen with less power consumption than water electrolysis. However, expensive metal-based electrocatalysts are needed, especially for the cathode reaction, in the electrolysis cells. Results from the present study demonstrate the production of hydrogen directly from cellulose, using an optimal mesoporous carbon as the cathode in addition to a partially oxygenated carbon anode at a temperature of 150 °C, with an electrolysis onset voltage of ca. 0.2 V, a current density of 0.29 A cm–2 at an electrolysis voltage of 1 V, and a current efficiency of approximately 100% for hydrogen production. These characteristics were comparable to those recorded when using a Pt/C anode and cathode under the same conditions. The sp2 planes of the carbon allowed π electrons to be donated to protons at the cathode. In addition, the mesoporous structure provided a sufficient amount of sp2 planes on the surface of the cathode.

DOI： 10.3390/catal10010106

Humidity Driven Transition from Insulator to Ionic Conductor in Portland Cement

Nagao, M; Kobayashi, K; Hori, T; Li, YR; Hibino, T

MATERIALS 12 巻 ( 22 ) 2019年11月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Materials

This work aims to assess ionic conduction in anhydrous cement particles and hydrated cement pastes with aging periods of 5-25 days. When a cement sample was humidified (relative humidity = 100%) over the range of 50-100 0C, it exhibited bulk conductivities of 10-3-10-2 S cm-1, regardless of the hydration level, whereas the interfacial conductivities varied in the range of 10-7-10-3 S cm-1, depending on the structural defects or conduction pathways of the sample. Both the bulk and interfacial conductivities were increased to 0.01 S cm-1 or higher at 100 0C, although the sample required previous moistening with water mist. The major charge carrier in the sample was determined to be hydroxide ions, and the total ion transport number was approximately 1. Exposing the sample to a mixture of carbon dioxide and water vapor caused a decrease in the bulk and interfacial conductivities; however, the bulk conductivity was returned to the initial value by treatment with an acid.

DOI： 10.3390/ma12223701

Addition of Docetaxel to Oral Fluoropyrimidine Improves Efficacy in Patients With Stage III Gastric Cancer: Interim Analysis of JACCRO GC-07, a Randomized Controlled Trial

PubMed

Kazuhiro Yoshida, Yasuhiro Kodera, Mitsugu Kochi, Wataru Ichikawa, Yoshihiro Kakeji, Takeshi Sano, Narutoshi Nagao, Masazumi Takahashi, Akinori Takagane, Takuya Watanabe, Masahide Kaji, Hiroshi Okitsu, Takashi Nomura, Takanori Matsui, Takaki Yoshikawa, Jin Matsuyama, Makoto Yamada, Seiji Ito, Masahiro Takeuchi, Masashi Fujii

Journal of Clinical Oncology 37 巻 ( 15 ) 頁： 1296 - 1304 2019年5月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：American Society of Clinical Oncology (ASCO)

<jats:sec><jats:title>PURPOSE</jats:title><jats:p> S-1 is a standard postoperative adjuvant chemotherapy for patients with stage II or III gastric cancer in Asia. Neoadjuvant or perioperative strategies dominate in Western countries, and docetaxel has recently shown significant survival benefits when combined with other standard regimens in advanced cancer and perioperative settings. </jats:p></jats:sec><jats:sec><jats:title>PATIENTS AND METHODS</jats:title><jats:p> This randomized phase III study was designed to prove the superiority of postoperative S-1 plus docetaxel over S-1 alone for R0 resection of pathologic stage III gastric cancer. The sample size of 1,100 patients was necessary to detect a 7% increase in 3-year relapse-free survival as the primary end point (hazard ratio, 0.78; 2-sided α = .05; β = .2). </jats:p></jats:sec><jats:sec><jats:title>RESULTS</jats:title><jats:p> The second interim analysis was conducted when the number of events reached 216 among 915 enrolled patients (median follow-up, 12.5 months). Analysis demonstrated the superiority of S-1 plus docetaxel (66%) to S-1 (50%) for 3-year relapse-free survival (hazard ratio, 0.632; 99.99% CI, 0.400 to 0.998; stratified log-rank test, P < .001), and enrollment was terminated as recommended by the independent data and safety monitoring committee. Incidences of grade 3 or greater adverse events, particularly neutropenia and leukopenia, were higher in the S-1 plus docetaxel group, but all events were manageable. </jats:p></jats:sec><jats:sec><jats:title>CONCLUSION</jats:title><jats:p> Addition of docetaxel to S-1 is effective with few safety concerns in patients with stage III gastric cancer. The present findings may also be applicable in countries in which perioperative adjuvant chemotherapy or chemoradiation is not standard. </jats:p></jats:sec>

DOI： 10.1200/jco.18.01138

Electrolysis of humidified methane to hydrogen and carbon dioxide at low temperatures and voltages

Hori, T; Ma, Q; Kobayashi, K; Nagao, M; Teranishi, S; Hibino, T

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 44 巻 ( 5 ) 頁： 2454 - 2460 2019年1月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：International Journal of Hydrogen Energy

Considerable amounts of hydrogen are produced from fossil fuels. In recent years, natural gas and biogas have received attention as important feedstocks for hydrogen production, because methane, their main component, is hydrogen rich and readily available. Methane steam reforming is the major industrial route for hydrogen production, but requires high temperature due to endothermic nature of the reaction. This report presents a new green technology for the efficient and ecological production of hydrogen from methane. A humidified methane was electrolyzed to hydrogen and carbon dioxide at low onset cell voltages (ca. 0.3–0.4 V), depending on the temperature (150–250 °C). Almost all currents were used for the production of hydrogen and carbon dioxide. Hydroxyl radicals generated from water vapor during the electrolysis played an important role as an active oxygen for the methane oxidation reaction at the anode. This is the first report on the production of hydrogen from methane at both low temperatures and voltages.

DOI： 10.1016/j.ijhydene.2018.12.044

Intermediate-temperature electrolysis of energy grass Miscanthus sinensis for sustainable hydrogen production

Ito, M; Hori, T; Teranishi, S; Nagao, M; Hibino, T

SCIENTIFIC REPORTS 8 巻 ( 1 ) 頁： 16186 2018年11月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Scientific Reports

Biohydrogen produced from the electrolysis of biomass is promising because the onset voltages are less than 1.0 V and comparable to those of water and alcohol-water electrolysis. The present study focuses on Miscanthus sinensis as a model grass because of its abundance and ease of cultivation in Japan. The electrochemical performance and hydrogen formation properties of electrolysis cells using grass as a biohydrogen source were evaluated at intermediate temperature to achieve electrolysis. The components, such as holocellulose, cellulose, lignin, and extractives, were separated from Miscanthus sinensis to understand the reactions of Miscanthus sinensis in the electrolysis cell. The relatively high resistivity and low current-voltage performance of an electrolysis cell using lignin were responsible for degradation of the electrolysis properties compared to those with pure cellulose or holocellulose as biohydrogen resources. Biohydrogen was formed according to Faraday’s law and evolved continuously at 0.1 A cm−2 for 3,000 seconds.

DOI： 10.1038/s41598-018-34544-y

Direct electrolysis of waste newspaper for sustainable hydrogen production: an oxygen-functionalized porous carbon anode

PubMed

Hibino, T; Kobayashi, K; Ito, M; Nagao, M; Fukui, M; Teranishi, S

APPLIED CATALYSIS B-ENVIRONMENTAL 231 巻頁： 191 - 199 2018年9月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Applied Catalysis B: Environmental

Biomass electrolysis enables hydrogen (H2) production at onset voltages of less than 1 V, depending on the fuel species. However, biofuel derived from biomass not categorized as food and produced from environmentally friendly processes is needed for the development of sustainable strategies. In addition, the biofuel should not require special and expensive procedures for processing. The present report describes the direct electrolysis of waste newspaper for H2 production. Cellulose and lignin included in the newspaper were subject to dissolution and hydrolysis in a phosphoric acid solvent at the anode in a temperature range of 100–175 °C. The resulting decomposition products were electrolyzed to H2 and carbon dioxide (CO2), at low onset voltages (ca. 0.2 V) and high current efficiencies (H2: 1.0, CO2: 0.9). Carbon black functionalized with carbonyl groups showed greater catalytic activity than a Pt/C catalyst for the anode reaction. H2 yield reached ca. 0.2 g per 1 g of newspaper in a batch cell. H2 was produced continuously in a current-density range of 0.15–0.25 A cm−2 while maintaining plateau-like voltage behavior in a flow cell. The energy consumed for electrolysis at a current density of 0.15 A cm−2 was as low as 1.27 kWh (Nm3)−1.

DOI： 10.1016/j.apcatb.2018.03.021

Efficient Hydrogen Production by Direct Electrolysis of Waste Biomass at Intermediate Temperatures

Hibino, T; Kobayashi, K; Ito, M; Ma, O; Nagao, M; Fukui, M; Teranishi, S

ACS SUSTAINABLE CHEMISTRY & ENGINEERING 6 巻 ( 7 ) 頁： 9360 - 9368 2018年7月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ACS Sustainable Chemistry and Engineering

Biomass has been considered as an alternative feedstock for energy and material supply. However, the lack of high-efficiency and low-cost processes for biomass utilization and conversion hinders its large-scale application. This report describes electrochemical hydrogen production from waste biomass that does not require large amounts of energy or high production costs. Hydrogen was produced by the electrolysis of bread residue, cypress sawdust, and rice chaff at an onset cell voltage of ca. 0.3 V, with high current efficiencies of approximately 100% for hydrogen production at the cathode and approximately 90% for carbon dioxide production at the anode. The hydrogen yields per 1 mg of the raw material were 0.1-0.2 mg for all tested fuels. Electrolysis proceeded continuously at plateau voltages that were proportional to the current. These characteristics were attributable to the high catalytic activity of the carbonyl-group functionalized mesoporous carbon for the anode reaction, and that the major components of biomass such as cellulose, starch, lignin, protein, and lipid were effectively utilized as fuels for hydrogen production.

DOI： 10.1021/acssuschemeng.8b01701

Hydrogen Production by Direct Lignin Electrolysis at Intermediate Temperatures

Hibino, T; Kobayashi, K; Nagao, M; Teranishi, S

CHEMELECTROCHEM 4 巻 ( 12 ) 頁： 3032 - 3036 2017年12月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ChemElectroChem

Hydrogen is produced conventionally by electrolyzing water or water vapor at onset voltages greater than 1 V, providing motivation for the development of more efficient electrolysis processes for a hydrogen economy. Numerous attempts have been made to use ethanol as a fuel for hydrogen production because this process reduces the electrolysis onset voltage significantly. However, ethanol feedstock from lignocellulose requires greater amounts of energy and results in higher production costs compared to those using starch as the feedstock. The current study describes direct lignin electrolysis at an onset voltage of ca. 0.25 V, with high current efficiencies of approximately 100 % for hydrogen production at the cathode and approximately 85 % for carbon dioxide production at the anode. Addition of H3PO4-impregnated lignin to the anode of a PtFe/C|Sn0.9In0.1P2O7 (150 μm)|Pt/C cell enabled hydrogen production at a temperature of 150 °C.

DOI： 10.1002/celc.201700917

High Performance Anode for Direct Cellulosic Biomass Fuel Cells Operating at Intermediate Temperatures

Hibino, T; Kobayashi, K; Lv, P; Nagao, M; Teranishi, S

BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 90 巻 ( 9 ) 頁： 1017 - 1026 2017年9月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Bulletin of the Chemical Society of Japan

The catalytic activity of the Pt/C anode in a fuel cell was improved by alloying Pt with other metals, followed by optimization of the alloy in terms of its atomic raio and content. The resulting PtFe/C anode yielded higher power densities and energy densities at 250°C for fuels composed of cypress, tissue paper, and cotton compared to those obtained using the Pt/C anode, despite its smaller Pt loading. The resulting fuel cell successfully produced energy using different fuel materials. The addition effect of Fe on the anode reaction was discussed based on the characterization kinetics.

DOI： 10.1246/bcsj.20170163

An Intermediate-Temperature Biomass Fuel Cell UsingWood Sawdust and Pulp Directly as Fuel

Grammatical evolution using two-dimensional gene for symbolic regression: an advanced improvement with conditional statement grammar 査読有り

Hideyuki Sugiura, Masahiro Nagao, Yi Zuo, Eisuke Kita

International Journal of Computational Intelligence Studies 5 巻 ( 3-4 ) 頁： 237-251 2017年4月

Balancing setup workers' load of flexible job shop scheduling using hybrid genetic algorithm with tabu search strategy 査読有り

Yasuhiko Morinaga, Masahiro Nagao, Mitsuru Sano

International Journal of Decision Support Systems 2 巻 ( 1-3 ) 頁： 71-90 2017年1月

Hibino, T; Kobayashi, K; Lv, P; Nagao, M; Teranishi, S; Mori, T

JOURNAL OF THE ELECTROCHEMICAL SOCIETY 164 巻 ( 6 ) 頁： F557 - F563 2017年

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Journal of the Electrochemical Society

Biomass is of significant interest in the field of advanced energy engineering, including the use of woody biomass as an energy source. However, because cellulose—the major component of wood—is insoluble in most solvents, an excessive amount of energy and special procedures are required to convert woody materials into liquid and gaseous fuel. This report describes a biomass fuel cell that provides power densities on the order of 10 mW cm−2 by direct utilization of wood sawdust and pulp as fuel. The fuel cell is simple, with H3PO4-impregnated raw materials located at the anode, and is operated at temperatures between 75 and 250°C. Cellulose or its decomposition products reacted with H2O to form CO2, where the coulombic yield was approximately 95% at 150°C or higher. Notably, the cell performance was superior to that of fuel cells with fuels (partially oxidized or dehydrated mono-to tetrasaccharides) obtained by an external treatment of cellulose with H3PO4.

DOI： 10.1149/2.0511706jes

NOx Sensing Characteristics of Semiconductor Gas Sensors under Controlled Oxygen Activity Conditions Using a Proton-Conducting Electrolyte

Nagao, M; Kobayashi, K; Lv, PL; Teranishi, S; Hibino, T

JOURNAL OF THE ELECTROCHEMICAL SOCIETY 164 巻 ( 9 ) 頁： B397 - B402 2017年

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Journal of the Electrochemical Society

The formation of highly oxidative and reductive states within and around WO3 and In2O3 during detection of NOx (NO and NO2) was investigated by attaching the metal oxide electrode to a proton-conducting Sn0.9In0.1P2O7 electrolyte, followed by electrode polarization at 200°C. Proton insertion and release occurred at the WO3 electrode, while metal-ion redox reactions proceeded at the In2O3 electrode. Although the hydrogen tungsten bronze formed under cathodic polarization was insensitive to NO and NO2, the WO3 operating under anodic polarization possessed sensitivity toward NO and NO2. Addition of these gases increased the ohmic, charge-transfer, and gas-diffusion resistances in a similar manner. The In2O3 underwent significant changes in NOx sensing ability upon changes in polarity and magnitude of the applied voltage. In particular, under cathodic polarization, the sensor resistance decreased upon addition of NO and NO2 in the range of -0.5 to -1.5 V, but increased upon addition at -2.0 V, due to reduction of In3+ to lower valence states, which selectively absorbed NO2 beginning at -1.7 V. The WO3 and In2O3 sensing abilities were not significantly affected by interference from O2, H2, CO, or n-C4H10, and the sensors became more sensitive toward NO2 as the WO3 and In2O3 particle size decreased.

DOI： 10.1149/2.0361709jes

Grammatical Evolution Using Tree Representation Learning

Maruta, S; Zuo, Y; Nagao, M; Sugiura, H; Kita, E

NEURAL INFORMATION PROCESSING (ICONIP 2017), PT IV 10637 巻頁： 346 - 355 2017年

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)

Grammatical evolution (GE) is one of the evolutionary computations, which evolves genotype to map phenotype by using the Backus-Naur Form (BNF) syntax. GE has been widely employed to represent syntactic structure of a function or a program in order to satisfy the design objective. As the GE decoding process parses the genotype chromosome into array or list structures with left-order traversal, encoding process could change gene codons or orders after genetic operations. For improving this issue, this paper proposes a novel GE algorithm using tree representation learning (GETRL) and presents three contributions to the original GE, genetic algorithm (GA) and genetic programming (GP). Firstly, GETRL uses a tree-based structure to represent the functions and programs for practical problems. To be different from the traditional GA, GETRL adopts a genotype-to-phenotype encoding process, which transforms the genes structures for tree traversal. Secondly, a pointer allocation mechanism is introduced in this method, which allows the GETRL to pursue the genetic operations like typical GAs. To compare with the typical GP, however GETRL still generates a tree structure, our method adopts a phenotype-to-genotype decoding process, which allows the genetic operations be able to be apply into tree-based structure. Thirdly, due to each codon in GE has different expression meaning, genetic operations are quite different from GAs, in which all codons have the same meaning. In this study, we also suggest a multi-chromosome system and apply it into GETRL, which can prevent from overriding the codons for different objectives.

DOI： 10.1007/978-3-319-70093-9_36