Details of a Researcher - OKAZAKI Shinji

Papers - OKAZAKI Shinji

about 93

Earthquake Damage Evaluation of Organic Coatings Applied to Inner Bottom Plates of Oil

Kasai Naoya, Okazaki Shinji, Tokutake Koya, Zama Shinsaku, Yoshida Shoichi

Journal of Japan Society for Safety Engineering 64 ( 1 ) 45 - 53 2025.2 [Reviewed]

DOI CiNii Research

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japan Soceiety for Safety Engineering Joint Work

<p>In the event of an unprecedented catastrophe such as a Nankai trough earthquake, there is a risk that various related equipment and facilities would severely degrade. Therefore, it is extremely important to build a soundness assessment system that enables the early restoration of functions of oil storage tank. In this study, repeated stress tests for vinyl ester resin-based glass flake coatings which are typically applied to bottom plates of tanks were conducted in order to estimate the degree of damage to the coating during an earthquake. In the case of testing the coating at average film thickness of 400 μm, physical damages such as cracking or delamination occurred as the strain on the coating surface reached about 1.38%. Furthermore, it is found that physical damage was also caused by repeated strain below this limit, and the tendency showed an S-N curve similar to that seen in metal fatigue fracture. In addition, field survey on corrosivity of sedimented waters on inner bottom plate of actual oil-storage tanks and long-term immersion tests for damaged coating samples were conducted. As results, the corrosivity is almost same that in marine environments and severe corrosion of steel under physical damage of coating were not detected. Based on these results, a flowchart for determining the next overhaul inspection time considering the aging of the performances of anti-corrosive coatings was proposed. The analysis following this chart enable us to estimate the soundness of the coating immediately after an earthquake without removing oil for overhaul inspection and can provide a rational criterion for emergency response.</p>

Evaluation of Corrosion Potential Stability of Stainless Steels in Dilute Electrolyte Solution for Application to a Quasi-Reference Electrode Used in Electrochemical Sensing System

Sawada, K; Okazaki, S; Inaba, T; Sakuma, M; Azuma, K

CHEMOSENSORS 13 ( 1 ) 2025.1 [Reviewed]

DOI Web of Science

Language：The in addition, foreign language Publishing type：Research paper (scientific journal) Joint Work

Hydrogen sensing performance and stability of WO3-SiO2 composite film doped with Pt catalyst

Tajima, C; Sawada, K; Okazaki, S; Kasai, N

JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY 2024.12 [Reviewed]

DOI Web of Science

Language：English Publishing type：Research paper (scientific journal) Joint Work

Development of an optode-type chloride ion sensor utilizing optical fiber with silver film

Trung, L; Kawai, A; Kasai, N; Okazaki, S

OPTICAL FIBER TECHNOLOGY 87 2024.10 [Reviewed]

DOI Web of Science

Language：English Publishing type：Research paper (scientific journal) Joint Work

Development of Fiber-Optic Hydrogen Sensor Using Platinum-Supported Tungsten Trioxide-Silica Composite Film

S. Okazaki, E. Ishii, Y. Nishijima, and T. Arakawa

ECS Transactions 114 ( 7 ) 13 - 23 2024.10 [Invited]

Authorship：Lead author Language：English Publishing type：Research paper (international conference proceedings) Single Work

Development of an optical fiber core sensor integrated with silver film for chloride ion measurement

Trung, LQ; Amano, M; Kasai, N; Okazaki, S

OPTICAL MATERIALS 154 2024.8 [Reviewed]

DOI Web of Science

Language：English Publishing type：Research paper (scientific journal) Joint Work

Characteristics of highly sensitive hydrogen gas sensor based on Pt-SiO<sub>2</sub>/Si microring resonator

Igarashi, J; Okazaki, S; Nishijima, Y; Higo, A; Arakawa, T

JAPANESE JOURNAL OF APPLIED PHYSICS 63 ( 5 ) 2024.5 [Reviewed]

DOI Web of Science

Language：English Publishing type：Research paper (scientific journal) Joint Work

Extraction of atmospheric corrosion monitoring sensor signals using MSSA and corrosion progress prediction with an LSTM model

Trung, LQ; Kasai, N; Le, M; Okazaki, S; Purwasih, N

SENSORS AND ACTUATORS A-PHYSICAL 366 2024.2 [Reviewed]

DOI Web of Science

Language：English Publishing type：Research paper (scientific journal) Joint Work

Evaluation of anti-corrosion performance of carbon steels mecanically plated with zinc alloy

SAWADA Kyosuke, KATO Akane, OKAZAKI Shinji, KASAI Naoya, KAMINO Tomohiro, HIRAI Kuninori

Journal of High Pressure Institute of Japan 62 ( 5 ) 217 - 227 2024 [Reviewed]

DOI CiNii Research

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：HIGH PRESSURE INSTITUTE OF JAPN(HPI) Joint Work

Determination of Chemical Species Dominating the Corrosivity of Japanese Tap Water by Multiple Regression Analysis

Nakamura, Y; Matsukawa, Y; Okazaki, S; Asakura, S

WATER 15 ( 24 ) 2023.12 [Reviewed]

DOI Web of Science

Language：English Publishing type：Research paper (scientific journal) Joint Work

アニオン交換処理による水道水の非腐食性化

中村勇二, 松川安樹, 岡崎慎司, 朝倉祝治

全国会議（水道研究発表会）講演集 2023 ( 0 ) 472 - 473 2023.9

DOI CiNii Research

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：公益社団法人日本水道協会 Joint Work

Service Life of the Ductile Iron Pipes

USUKI Katsuya, OTSUKI Naotaka, FUKUOKA Chihiro, TANAKA Takuya, SEKITA Masanobu, FUJIKAWA Kazuhisa, … Show more authors

Journal of Japan Water Works Association 92 ( 9 ) 12 - 19 2023.9

DOI CiNii Research

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japan Water Works Association Joint Work

The water distribution pipelines managed by the Bureau of Waterworks of the Tokyo Metropolitan Government
are approximately 27,000 kilometers long, and upgrading all of the pipelines to earthquake-resistant joint pipes is
expected to take many years and require great expense. Therefore, it is necessary to implement the renewal of
pipelines in an effective and systematic manner from a medium-to long-term perspective. On the other hand, the
legal durable years of water pipelines is 40 years, but the results of past surveys have confirmed that there had
been many pipelines with durability of more than 40 years. In this study, we focused on the fact that the main cause
of deterioration is pitting corrosion, and attempted to analyze the prediction of deterioration of ductile iron pipes
based on the results of investigations of the pipe bodies and surrounding soil. The results of this analysis indicate
that ductile iron pipes have service life of 50 to 90 years, which exceed the legal service life.

Effects of additive and substrate on hydrogen sensing performances of sol-gel derived platinum doped tungsten trioxide gasochromic films

Yamasak Naoki, Okazaki Shinji, Nishijima Yoshiaki, Arakawa Taro

THIN SOLID FILMS 779 2023.8 [Reviewed]

DOI Web of Science

Language：English Publishing type：Research paper (scientific journal) Joint Work

Catalytic combustion type optical fiber Bragg grating hydrogen gas sensor using platinum-loaded fumed silica powder

Okazaki Shinji, Kawada Hiroyuki, Koshiba Yusuke, Kasai Naoya, Maru Yusuke, Mizutani Tadahito, Takes … Show more authors

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 48 ( 25 ) 9512 - 9527 2023.3 [Reviewed]

DOI Web of Science

Language：English Publishing type：Research paper (scientific journal) Joint Work

Production of Non-corrosive Water by Anion Exchange Treatment :Applicability of This Process to 71 Different Tap waters with Actual Proof

Techinical Papers of Annual Meeting the Society of Heating,Air-conditioning and Sanitary Engineers of Japan 2023.01 ( 0 ) 85 - 88 2023

DOI CiNii Research

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Society of Heating,Air-Conditioning&Sanitary Engineers of Japan Joint Work

Application of Machine Learning for Data with an Atmospheric Corrosion Monitoring Sensor Based on Strain Measurements

Okura Taisei, Kasai Naoya, Minowa Hirotsugu, Okazaki Shinji

METALS 12 ( 7 ) 2022.7 [Reviewed]

DOI Web of Science

Language：English Publishing type：Research paper (scientific journal) Joint Work

Corrosion Countermeasure for Building Equipment in Water Piping System

NAKAMURA Yuji, YAMADA Ikuhiro, MATSUKAWA Yasuki, OKAZAKI Shinji, ASAKURA Shukuji

Transactions of the Society of Heating,Air-conditioning and Sanitary Engineers of Japan 47 ( 303 ) 19 - 28 2022.6 [Reviewed]

DOI CiNii Research

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Society of Heating, Air-Conditioning & Sanitary Engineers of Japan Joint Work

<p>The authors are proceeding with a series of studies on corrosion countermeasures for building equipment in water piping systems. In the previous paper (Part1), the authors showed that treatment of tap water with anion exchange resin reduced corrosivity drastically. In practice, carbon steel did not corrode for 720h in the treated water. This paper (Part2) aimed to elucidate the mechanism of this reduction in corrosivity. First, the trajectory of corrosion potential vs. pH over time was discussed on the Pourbaix Diagram. The trajectory indicated that the passive film became tough in the treated water, while it collapsed in untreated water. The corrosion indexes supported this mechanism. Second, the change of water composition before and after the corrosion test was studied. The concentrations of Ca<sup>2+</sup> and ionic SiO<sub>2</sub>, which were thought to be main constituents of the deposits, changed slightly. This indicated that no deposits was formed at the metal surface. From these results, the authors concluded that the key mechanism of corrosion prevention of the treated waters was the sustenance of passive film. </p>

Investigation of Accelerated Degradation Methods to Cause Blisters for Non-Defective Vinyl Ester Resin Glass Flake Organic Coatings

Tokutake Koya, Okazaki Shinji, Kodama Shintaro

COATINGS 12 ( 1 ) 76 2022.1 [Reviewed]

DOI Web of Science

Language：English Publishing type：Research paper (scientific journal) Joint Work

Corrosion Countermeasure for Building Equipment in Water Piping System

NAKAMURA Yuji, YAMADA Ikuhiro, MATSUKAWA Yasuki, OKAZAKI Shinji, ASAKURA Shukuji

Transactions of the Society of Heating,Air-conditioning and Sanitary Engineers of Japan 46 ( 297 ) 57 - 65 2021.12

DOI CiNii Research

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Society of Heating, Air-Conditioning & Sanitary Engineers of Japan Joint Work

<p>Tap waters contain both the corrosive anions like SO<sub>4</sub><sup>2－</sup>，Cl<sup>－</sup> and corrosion inhibitive ions such as HCO<sub>3</sub><sup>－</sup>. An anion exchange resin can replace SO<sub>4</sub><sup>2－</sup> and Cl<sup>－</sup> with HCO<sub>3</sub><sup>－</sup>. Thus， the treatment of tap waters by the anion exchange resin， which regenerated with NaHCO<sub>3</sub>， could produce the corrosion preventive water. This paper aimed at verifying the above idea. The results were as follows; 1) Corrosion tests of carbon steel in the tap waters collected in three areas in Japan were made. At the same time, the corrosion was tested in the waters treated with the anion exchange resin. 2) Corrosion in the treated waters did not appear for 720 hrs. 3) Corrosion potential in the treated water moved rapidly to the positive side. The corrosion potential in the untreated water migrated to the negative side. 4) The corrosion prevention mechanism appeared to result from the formation of passive layer on carbon steel. The authors recommend the application of this technique from the initial operating stages of water piping system. Elongation of piping system was highly expected. </p>

Corrosion Countermeasure for Building Equipment in Water Piping System(Part 1)Corrosion Prevention Nature for Carbon Steel in Tap Waters Treated with Anion Exchange Resin

Transactions of the Society of Heating, Air-Conditioning and Sanitary Engineers of Japan ( 297 ) 57 - 65 2021.12 [Reviewed]

Language：Japanese Publishing type：Research paper (scientific journal) Joint Work

Potentiometric Free Chlorine Detection without Using Conventional Reference Electrodes

Okazaki Shinji, Yoshida Kazuyuki, Kodera Natsumi, Ujiie Shuntaroh, Nishimatsu Yukino, Tanaka Yoshit … Show more authors

JOURNAL OF THE ELECTROCHEMICAL SOCIETY 168 ( 11 ) 117516 2021.11 [Reviewed]

DOI Web of Science

Language：English Publishing type：Research paper (scientific journal) Publisher：The Electrochemical Society Joint Work

Corrosion of Carbon Steel in Tap Water (Ⅱ) : -Growth of Rusted Area on Metal Surface in Relation to Corrosion Potential-

Nakamura Yuji, Matsukawa Yasuki, Okazaki Shinji, Asakura Shukuji

Zairyo-to-Kankyo 70 ( 9 ) 295 - 301 2021.9 [Reviewed]

DOI CiNii Research

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japan Society of Corrosion Engineering Joint Work

<p>This research was focused on the growth of rusted areas on the surface of carbon steel in tap waters, which were collected at 66 locations in Japan.</p><p>Rusted area ratio （θ） was defined as θ＝A<sub>rust</sub>/A, where A was total surface area and A<sub>rust</sub> was the area covered with corrosion products. The changes of θ and corrosion potential （<i>E</i><sub>corr</sub>） with time were investigated.</p><p>The followings （1）-（6） were resulted.</p><p>（1）As immersion time elapsed, θ increased and <i>E</i><sub>corr</sub> became less noble.</p><p>（2）The abrupt changes in θ and <i>E</i><sub>corr</sub> with time appeared simultaneously. Stagnations of both θ and <i>E</i><sub>corr</sub> followed the above. The time of the abrupt change depended on quality of the tap water.</p><p>（3）The relationship between log{θ/（1－θ）} and <i>E</i><sub>corr</sub> was similar regardless of water quality.</p><p>This meant that the rusted area could be estimated only by measuring <i>E</i><sub>corr</sub>.</p><p>（4）The abrupt change was in θ seen from 0.2 to 0.5 and <i>E</i><sub>corr</sub> from －300 to －500 mV vs.SSE, the time at which <i>E</i><sub>corr</sub> reached －400 mV was defined as <i>t</i><sub>initial</sub>. For larger <i>t</i><sub>initial</sub>, the corrosion at small θ rusted longer.</p><p>（5）Both average and maximum localized corrosion rates were closely related to <i>t</i><sub>initial</sub>. Insight into those relations surmised the following mechanisms;</p><p>（a）When θ＜0.2, the anodes were fixed, inducing localized corrosion.</p><p>（b）When θ＞0.5, anodic and cathodic reactions were distributed even on the whole surface, resulting in then uniform corrosion.</p><p>（6）The authors found that the maximum localized corrosion rate, <i>v</i><sub>max</sub>（mm y<sup>－1</sup>） was a function of <i>t</i><sub>initial</sub> as <i>v</i><sub>max</sub>＝0.32×<i>t</i><sub>initial</sub><sup>1/3</sup>. The unit of <i>t</i><sub>initial</sub> in this equation was hour.</p>

Pulsed laser deposition of Pt-WO3 of Hydrogen sensors under atmospheric conditions

Yoshiaki Nishijima, Kenya Enomonoto, Shinji Okazaki, Taro Arakawa, Armandas Balčytis, Saulius Juodk … Show more authors

Applied surface science 534 147568-1 - 147568-6 2020.12 [Reviewed]

DOI Web of Science

Language：English Publishing type：Research paper (scientific journal) Joint Work

Corrosion of Carbon steel in Tap Water (Ⅰ)New Corrosion Index Based on Water Quality

Nakamura Yuji, Matsukawa Yasuki, Okazaki Shinji, Asakura Shukuji

Zairyo-to-Kankyo 69 ( 10 ) 271 - 276 2020.10 [Reviewed]

DOI CiNii Research

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japan Society of Corrosion Engineering Joint Work

<p>A new method to evaluate the corrosivity of tap water to carbon steel has been proposed. Corrosion tests for the tap waters sampled at 49 locations throughout Japan were conducted. Average corrosion rate <i>v</i><sub>w</sub> and maximum one <i>v</i><sub>max</sub> were measured. Relatively close relationship of <i>v</i><sub>w</sub> and <i>v</i><sub>max</sub> to concentration of SiO<sub>2</sub> and SO<sub>4</sub><sup>2－</sup> were found. On the other hand, the corrosion rates showed slight dependence on concentrations of Cl<sup>－</sup> and HCO<sub>3</sub><sup>－</sup>. These facts are contradictory to the conventional knowledge. Furthermore, the authors surmised that [SO<sub>4</sub><sup>2－</sup>]/[SiO<sub>2</sub>], named SS ratio, was an effective Corrosion Index. SS ratio showed closer relationship to <i>v</i><sub>w</sub> and <i>v</i><sub>max</sub> than Langelier Index, Ryznar Stability Index and Larson-Skold Index. The authors succeeded in expressing <i>v</i><sub>w</sub> and <i>v</i><sub>max</sub> as a function of only SS ratio.</p>

Improvement and stabilization of optical hydrogen sensing ability of Au-Pd alloys

Nishijima Yoshiaki, Kurotsu Takuma, Yamasaku Naoki, Takahashii Hajime, Kurihara Keisuke, Beni Takaa … Show more authors

OPTICS EXPRESS 28 ( 17 ) 25383 - 25391 2020.8 [Reviewed]

DOI Web of Science

Language：English Publishing type：Research paper (scientific journal) Joint Work

Atmospheric Corrosion Sensor Based on Strain Measurement with Active-Dummy Fiber Bragg Grating Sensors

Purwasih Nining, Shinozaki Hiroki, Okazaki Shinji, Kihira Hiroshi, Kuriyama Yukihisa, Kasai Naoya

METALS 10 ( 8 ) 1076 2020.8 [Reviewed]

DOI Web of Science

Language：English Publishing type：Research paper (scientific journal) Joint Work

Other Link： https://www.mdpi.com/2075-4701/10/8/1076

Applicability of Electrical Equivalent Circuit Analysis Based on Voigt Model to Electrochemical Degradation Diagnosis of Heavy-duty Coating on Inner Surface of Oil-strage Tank and its Validation Using Depth Profile Analysis by IR and Raman Spectroscopy

Tokutake Koya, Okazaki Shinji, Sasaki Shohei

Zairyo-to-Kankyo 69 ( 3 ) 66 - 72 2020.3

DOI CiNii Research

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japan Society of Corrosion Engineering Joint Work

<p>To investigating the long-term degradation of a heavy-duty coating, Fourier transform infrared spectroscopy （FT-IR） and Raman spectroscopy along the depth direction of a vinyl ester resin organic coating containing glass flakes was conducted. The organic coating sample was applied to the inner surface of the bottom plate of the oil storage tank, and used for approximately seventeen years. In addition, the degradation evaluation using the electrical equivalent circuit （EEC） model considering depth direction distribution of R//C time-constant （Voigt measurement model） was examined in detail.</p><p>In the FT-IR along the coating depth direction, no clear peak shift and/or disappearance of the spectrum was observed. On the other hand, the baseline of the Raman shift of the coating gradually increased from near the steel substrate interface toward coating surface. These results suggest that the long-term coating degradation appears as a difference in physical change along the depth direction, and supports the result that the impedance characteristics of the coating can be well-analyzed by Voigt measurement model. Furthermore, it is expected that the DC resistance value can be estimated accurately by the EEC analysis using Voigt measurement model.</p>

Applicability of electrical equivalent circuit analysis based on Voigt model to electrochemical degradation diagnosis of heavy-duty coating on inner surface of oil-storage tank and its validation using depth profile analysis by IR and Raman spectroscopy

69 ( 3 ) 66 - 72 2020.3 [Reviewed]

Language：Japanese Publishing type：Research paper (scientific journal) Joint Work

Temperature characteristics of hydrogen gas sensor based on Pt-WO3/Si microring resonator

Matsuura Sosuke, Yamasaku Naoki, Nishijima Yoshiaki, Okazaki Shinji, Arakawa Taro

JSAP Annual Meetings Extended Abstracts 2020.1 ( 0 ) 1176 - 1176 2020.2

DOI CiNii Research

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japan Society of Applied Physics Joint Work

Characteristics of Highly Sensitive Hydrogen Sensor Based on Pt-WO3/Si Microring Resonator

Matsuura Sosuke, Yamasaku Naoki, Nishijima Yoshiaki, Okazaki Shinji, Arakawa Taro

SENSORS 20 ( 1 ) 2020.1 [Reviewed]

DOI Web of Science

Language：English Publishing type：Research paper (scientific journal) Joint Work

シリコン微小リングリング共振器の高感度センサへの応用

岡崎慎司, 西島喜明

光アライアンス 4 14 - 19 2020

Language：The in addition, foreign language Publishing type：Research paper (scientific journal) Joint Work

Real-time aerosol chloride deposition measuring device using a conductivity sensor

Ngoc Duc Pham, Shinji Okazaki, Yukihisa Kuriyama, Naoya Kasai, Katsuyuki Suzuki

Atmospheric Environment Vol.213 757 - 766 2019.9 [Reviewed]

Language：English Publishing type：Research paper (scientific journal) Publisher：Science Direct Joint Work

Other Link： https://doi.org/10.1016/j.atmosenv.2019.06.018

Metamaterial for Hydrogen Sensing

Takaaki Beni, Naoki Yamasaku, Takuma Kurotsu,Naoki To, Shinji Okazaki,Taro Arakawa, Armandas Balcyt … Show more authors

2019 American Chemical Society 4 ( 9 ) 2389 - 2394 2019.8

Language：English Publishing type：Research paper (scientific journal) Publisher：ACS Publications Joint Work

Atmospheric Corrosion Sensor Based on Strain Measurement with an Active Dummy Circuit Method in Experiment with Corrosion Products

Nining Purwasih, Naoya Kasai, Shinji Okazaki, Hiroshi Kihira, Yukihisa Kuriyama

Journals Vol. 9 ( 5 ) 2019.5

Language：English Publishing type：Research paper (scientific journal) Publisher：MDPI Joint Work

Other Link： https://doi.org/10.3390/met9050579

A new analysis of wind on chloride deposition for long-term aerosol chloride deposition monitoring with weekly sampling frequency

Ngoc Duc Pham,Yukihisa Kuriyama,Naoya Kasai,Shinji Okazaki,Katsuyuki Suzuki,Duy Thao Nguyen

Atmospheric Environment 198 46 - 54 2019.2 [Reviewed]

Language：English Publishing type：Research paper (scientific journal) Joint Work

Response Characteristics of Silicon Microring Resonator Hydrogen Gas Sensor

Naoki Yamasaku, Sosuke Matsuura, Yoshiaki Nishijima, Taro Arakawa, Shinji Okazaki

電気学会論文誌Ｅ（センサ・マイクロマシン部門誌） 139 ( 1 ) 2 - 6 2019.1 [Reviewed]

Language：English Publishing type：Research paper (scientific journal) Joint Work

Effect of jumping current on corrosion behaviors of stainless-steel and steel water pipeline separated by insulating joint

Keita Ishibashi, Shinji Okazaki, Masahiko Takahashi, Akihito Kibushi, Moriyasu Kitano

Engineering Failure Analysis 92 278 - 288 2018.10 [Reviewed]

Language：English Publishing type：Research paper (scientific journal) Joint Work

Potential Response of Passive Metal Electrodes to Free Chlorine in Tap Water

K. Okamura, N. Hirano, N. Yamasaku, S. Okazaki, Y. Tanaka, I. Hori, T. Gomei

17th International Meeting on Chemical Sensors - IMCS 2018 2018.7 [Reviewed]

Language：English Publishing type：Research paper (international conference proceedings) Joint Work

A Robust Fiber Bragg Grating Hydrogen Gas Sensor Using Platinum-Supported Silica Catalyst Film

Marina Kurohiji, Seiji Ichiriyama, Naoki Yamasaku, Shinji Okazaki, Naoya Kasai, Yusuke Maru, Tadahi … Show more authors

Journal of Sensors 2018 5810985 2018.2 [Reviewed]

DOI Web of Science

Language：English Publishing type：Research paper (scientific journal) Publisher：HINDAWI LTD Joint Work

Development of Amplifier Circuit by Active-Dummy Method for Atmospheric Corrosion Monitoring in Steel Based on Strain Measurement

Nining Purwasih, Naoya Kasai, Shinji Okazaki, Hiroshi Kihira

Metals 8 ( 1 ) 5 2017.12 [Reviewed]

DOI Web of Science

Language：English Publishing type：Research paper (scientific journal) Publisher：MDPI Joint Work

Optical readout of hydrogen storage in films of Au and Pd

Yoshiaki Nishijima, Shogo Shimizu, Keisuke Kurihara, Yoshikazu Hashimoto, Hajime Takahashi, Armanda … Show more authors

Optics Express 25 ( 20 ) 24081 - 24092 2017.10 [Reviewed] [Invited]

DOI Web of Science PubMed

Language：English Publishing type：Research paper (scientific journal) Publisher：OPTICAL SOC AMER Joint Work

Plasmonic Hydrogen Sensor at Infrared Wavelengths

Yoshiaki Nishijima, Armandas Balčytis, Gediminas Seniutinas, Saulius Juodkazis, Taro Arakawa, Shin … Show more authors

Sensors and Materials 29 ( 9 ) 1269 - 1274 2017.6 [Reviewed]

DOI Web of Science

Language：English Publishing type：Research paper (scientific journal) Publisher：MYU, SCIENTIFIC PUBLISHING DIVISION Joint Work

Optimization of Hydrogen Sensing Performance of Pt/WO3 Gasochromatic Film Fabricated by Sol-Gel Method

Hajime Takahashi, Shinji Okazaki, Yoshiaki Nishijima, Taro Arakawa

Sensors and Materials 29 ( 9 ) 1259 - 1268 2017.5 [Reviewed]

Language：English Publishing type：Research paper (scientific journal) Publisher：MYU K.K. Joint Work

Other Link： https://myukk.org/SM2017/article.php?ss=1585

Development of an all-solid-state residual chlorine sensor for tap water quality monitoring

Naoki Kato,Natsumi Hirano,Shinji Okazaki,Satoru Matsushita,Tomoo Gomei

Sensors and Actuators B:Chemical 248 1037 - 1044 2017.3 [Reviewed]

DOI Web of Science

Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER Joint Work

Atmospheric corrosion sensor based on strain measurement

N. Kasai, M. Hiroki, T. Yamada, H. Kihira, K. Matsuoka, Y. Kuriyama, S. Okazaki

Measurment science and technology 28 ( 1 ) 015106(7pp) 2017.1 [Reviewed]

DOI Web of Science

Language：English Publishing type：Research paper (scientific journal) Publisher：IOP PUBLISHING LTD Joint Work

In this paper, an in situ atmospheric corrosion sensor based on strain measurement is discussed. The theoretical background for measuring the reduction in thickness of low carbon steel is also presented. Based on the theoretical considerations, a test piece and apparatus for an atmospheric corrosion sensor were designed. Furthermore, in a dry-wet cyclic accelerated exposure experiment, the measured strain indicated thinning of the test piece, although the corrosion product generated on the surface of the test piece affected the results. The atmospheric corrosion sensor would be effective for evaluating atmospheric corrosion of many types of infrastructure.

Mechanism for corrosion prevention by mechanical plating of uniform zinc-iron alloy

N. Kasai, Y. Kaku, S. Okazaki, K. Hirai

Journal of materials engineering and performance 25 ( 11 ) 4680 - 4685 2016.11 [Reviewed]

DOI Web of Science

Language：English Publishing type：Research paper (scientific journal) Publisher：SPRINGER Joint Work

In situ electrochemical monitoring with a three-electrode cell was applied to investigate the anti-corrosion properties of a mechanical zinc-iron alloy plating. Several electron probe microanalyses were also conducted to identify the chemical elements in the plating. The results indicated the formation of a Zn-Fe intermetallic compound, which allowed a mechanism for corrosion prevention to be proposed. In the proposed mechanism, Zn(OH)(2) plays a significant role in the corrosion prevention of steel alloys.

Experimental investigation of the fire extinguishing capability of ferrocene-containing water mist

Koshiba, Yusuke Okazaki, Shinji Ohtani, Hideo

Fire Safety journal 83 90 - 98 2016.7 [Reviewed]

DOI Web of Science

Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER SCI LTD Joint Work

Evaluation of Electrical Properties of Organic Coating on Internal Bottom Plate of Oil Storage Tank:-Interpretation of Impedance Spectra Using Constant-Phase Element-

Koya Tokutake, Haruki Nishi, Daisuke Ito, Shinji Okazaki, Yukitaka Serizawa

zairyo-to-kankyo 65 ( 1 ) 24 - 30 2016.6 [Reviewed]

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japan Society of Corrosion Engineering Joint Work

Other Link： https://www.jstage.jst.go.jp/article/jcorr/65/1/65_24/_article/-char/ja/

Monitoring of Degradation Process of Heavy-Duty Coating on Internal Bottom Plate of Oil Storage Tank:-Quantitative Evaluation of Blister Growth under Temperature Gradient-

Daisuke Ito,Koya Tokunaga,Shinji Okazaki,

Pressure engineering : journal of Japan High Pressure Institute 54 ( 1 ) 25 - 34 2016.2 [Reviewed]

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japan High Pressure Institute Joint Work

Other Link： https://www.jstage.jst.go.jp/article/hpi/54/1/54_25/_article/-char/ja/

Application of Extreme Value Analysis for Degradation Characteristics Evaluation of Organic Coating on Internal Bottom Plate of Oil Storage Tank

TOKUNAGA Koya,NISHI Haruki,KASAI Naoya,OKAZAKI Shinji

Pressure engineering : journal of Japan High Pressure Institute 53 ( 5 ) 274 - 281 2015.10 [Reviewed]

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japan High Pressure Institute Joint Work

Other Link： https://www.jstage.jst.go.jp/article/hpi/53/5/53_274/_article/-char/ja/

Preparation and electrical properties of sintered bodies composed of CrxMn1.5Co(1.0-x)Ni0.5O4 with a cubic spinel structure

T. Yokoyama, A. Hirose, T. Meguro, D. Itoh, Y. Koshiba, S.Okazaki

J. Electroceram. 37 ( 1-4 ) 1 - 7 2015.10 [Reviewed]

DOI Web of Science

Language：English Publishing type：Research paper (scientific journal) Publisher：SPRINGER Joint Work

Relationship between degradation characteristics of organic coatingon internal bottom plate of oil storage tank and constant-phase element parameter values

K. Tokutake, H. Nishi, D. Itoh, S. Okazaki, Y. Serizawa

Progress in Organic Coatings 87 69 - 74 2015.10 [Reviewed]

Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER Joint Work

Catalyst-type-an optical fiber sensor for hydrogen leakage based on fiber Bragg gratings

Satoshi Masuzawa, Shinji Okazaki, Yusuke Maru, Tadahito Mizutani

Sensors and Actuators B: Chemical 217 151 - 157 2015.10 [Reviewed]

DOI Web of Science

Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER Joint Work

Other Link： http://www.sciencedirect.com/science/article/pii/S0925400514012362

Constant-phase element characteristics caused by resistivity distribution in high performance anti-corrosion organic coating applied to oil storage tank

K. Tokutake, H. Nishi, D. Itoh, S. Okazaki, Y. Serizawa

ECS Transaction 69 ( 26 ) 1 - 8 2015.10 [Reviewed]

Language：English Publishing type：Research paper (international conference proceedings) Publisher：The Electrochemical Society Joint Work

Other Link： http://ecst.ecsdl.org/content/69/26/1

Temperature dependence and degradation of gasochromic response behavior in hydrogen sensing with Pt/WO3 thin film

S. Okazaki, S. Johjima

Thin Solid Films 558 411 - 415 2014.5 [Reviewed]

DOI Web of Science

Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER Joint Work

Development of an antenna coil type sensor device for hydrogen leakage detection

K. Tokutake and S. Okazaki

Sensors & Actuators B:Chemical 191 165 - 170 2014.2 [Reviewed]

DOI Web of Science

Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER Joint Work

Preparation and electrical properties of sintered oxide composed of MnFeNiO4 with cubic spinel structure

T. Yokoyama, T. Meguro, S. Okazaki, D. Itoh, J. Tatami, T. Wakihara, K. Komeya

J. Electroceram. 31 ( 3-4 ) 353 - 359 2013.12 [Reviewed]

DOI Web of Science

Language：English Publishing type：Research paper (scientific journal) Publisher：SPRINGER Joint Work

Development of a fiber Bragg grating sensor for hydrogen leak detection using noble metal catalyst

S. Masuzawa, S. Okazaki, Y. Maru, T. Mizutani

The 10th Asian Conference on Chemical Sensors, Abstract book 188 2013.11 [Reviewed]

Language：English Publishing type：Research paper (other science council materials etc.) Joint Work

Optimization of hydrogen sensing performance of Pt/WO3 gasochromic film derived by sol-gel method

The 10th Asian Conference of Chemical Sensors, Abstract book 115 2013.11 [Reviewed]

Language：English Publishing type：Research paper (other science council materials etc.) Single Work

Improvement of Structural Integrity of Pressure Vessels by Peening

K. Takahashi, K. Houjou, H. Abe, K. Ando, S. Okazaki

Journal of the Japan Boiler Association 381 15 - 22 2013.10 [Reviewed]

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japan Boiler Association Joint Work

Evaluation of degradation of high performance organic coatings under outdoor salt spray test

D. Itoh, Y. Akira, Y. Miyata, T. Yokoyama, S. Okazaki

ECS Transaction 50 ( 50 ) 37 - 42 2013.10 [Reviewed]

DOI Web of Science

Language：English Publishing type：Research paper (international conference proceedings) Publisher：ELECTROCHEMICAL SOC INC Joint Work

Anomalous Gasochromic Response Behavior in Hydrogen Sensing with Pt/WO3 Film at Low Temperature Range

S. Okazaki , R. Yamasaki, S. Johjima

IMCS 2012 The 14th International Meeting on Chemical Sensors 729 - 731 2012

Language：English Publishing type：Research paper (scientific journal) Joint Work

Development of a distributed hydrogen gas sensor using bismuth oxide based optical fiber

OKAZAKI Shinji

Pressure engineering : journal of Japan High Pressure Institute 50 ( 4 ) 170 - 176 2012 [Reviewed]

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japan High Pressure Institute Single Work

Other Link： https://www.jstage.jst.go.jp/article/hpi/50/4/50_170/_article/-char/ja/

An activated sludge treatment of toluene diamine (TDA): Evaluation of inhibition behavior and effect of aniline as a co-substrate

Shinji Okazaki, Kazuho Nakamura

Separation process engineering 42 ( 6 ) 387 - 394 2012 [Reviewed]

Language：English Publishing type：Research paper (scientific journal) Publisher：Separation process engineering Association Joint Work

Sensing characteristics of a fiber Bragg grating hydrogen gas sensor using sol-gel derived Pt/WO3 Film

S. Okazaki, Y. Maru, T. Mizutani

ECS Transactions 50 ( 12 ) 289 - 294 2012 [Reviewed]

DOI Web of Science

Language：English Publishing type：Research paper (scientific journal) Publisher：ELECTROCHEMICAL SOC INC Joint Work

A distributed hydrogen gas sensor using high refractive index optical fiber

S. Okazaki, H. Nakagawa, K. Murata, and K. Fukuda

Sensor letters 9 ( 2 ) 638 - 690 2011 [Reviewed]

DOI Web of Science

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER SCIENTIFIC PUBLISHERS Joint Work

Development of an Electrical-Type Distributed Hydrogen Gas Sensor Using Pt/WO₃ Thin Film for Detection of Leakage Locations

Shinji Okazaki,Sayaka Yamashita

The transactions of the Institute of Electrical Engineers of Japan 130 ( 2 ) 53 - 58 2010 [Reviewed]

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Institute of Electrical Engineers of Japan Joint Work

Other Link： https://www.jstage.jst.go.jp/article/ieejsmas/130/2/130_2_53/_article/-char/ja/

Development of a durable fiber-optic oxygen sensor for harsh underground environments

Yusuke Koshiba, Yuki Nakamura, Daisuke Ito, Takashi Yokoyama, Shinji Okazaki, Hidemoto Nakagawa, Ta … Show more authors

Talanta 82 ( 4 ) 1495 - 1499 2010 [Reviewed]

DOI Web of Science PubMed

Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER Joint Work

Novel Method for Detection of Hydrogen Gas Leak Sites Using Pt/WO₃ Imaging Devices

S.Okazaki,N. Kasai, S. Yamashita

Journal of the Japan Petroleum Institute 53 ( 3 ) 130 - 134 2010 [Reviewed]

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japan Petroleum Institute Joint Work

Other Link： https://www.jstage.jst.go.jp/article/jpi/53/3/53_3_130/_article/-char/ja/

Anodic Polarization Properties of Intermetallic Compounds FeAl and FeAl(Cr) in HCl solution

Masahide Tomaru,Shinji Okazaki

The journal of the Surface Finishing Society of Japan 61 ( 7 ) 541 - 545 2010 [Reviewed]

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Surface Finishing Society of Japan Joint Work

Other Link： https://www.jstage.jst.go.jp/article/sfj/61/7/61_7_541/_article/-char/ja/

A fiber-optic hydrogen gas sensor with low propagation loss

S.Okazaki, T. Watanabe, H. Nakagawa, K. Murata, K. Fukuda

Sensors and Actuators B: Chemical 145 ( 2 ) 781 - 787 2010 [Reviewed]

DOI Web of Science

Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER Joint Work

Response kinetics of a fiber-optic gas sensor using Pt/WO3 thin film to hydrogen

Matsuyama, N; Okazaki, S; Nakagawa, H; Sone, H; Fukuda, K

Thin Solid Films 517 ( 16 ) 4650 - 4653 2009 [Reviewed]

DOI Web of Science

Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER Joint Work

Development of a fiber-optic oxygen sensor for lont-term corrosion monitoring of radioactive-waste repository

S. Okazaki, Y. Nakamura, D. Ito, Y. Yokoyama, H. Nakagawa, T. Arai

Sensor letters 6 ( 6 ) 951 - 955 2008 [Reviewed]

Language：English Publishing type：Research paper (scientific journal) Joint Work

Electrical properties of Mn-Co-Ni Oxides Prepared at Low Temperature

T.Yokoyama, T.Megro, S.Okazaki, H.Fujiwara, T.Ishikawa, J.Tatami, T.Wakihara, K.Komeya and T.Sasamo … Show more authors

Advanced Materials Research 29-30 359 - 362 2007 [Reviewed]

DOI Web of Science

Language：English Publishing type：Research paper (international conference proceedings) Publisher：TRANS TECH PUBLICATIONS LTD Joint Work

Distributed hydrogen determination with fiber-optic sensor

S.Sumida, S.Okazaki, S.Asakura, H.Nakagawa, H.Murayama, and T.Hasegawa

Sensors and Actuators 108 508 - 514 2005 [Reviewed]

DOI Web of Science

Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER Joint Work

A room-temperature operated hydrogen leak sensor

H. Nakagawa, N. Yamamoto, S. Okazaki, T. Chinzei, S. Asakura

Sensors and Actuators 93 ( 1-3 ) 468 - 474 2003 [Reviewed]

DOI Web of Science

Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER Joint Work

Sensing characteristics of an optical fiber sensor for hydrogen leak

S. Okazaki, H. Nakagawa, S. Asakura, Y. Tomiuchi, N. Tsuji, H. Murayama, M. Washiya

Sensors and Actuators 93 ( 1-3 ) 142 - 147 2003 [Reviewed]

DOI Web of Science

Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER Joint Work

Sensing characteristics of a newly developed ozone sensor

Hidemoto NAKAGAWA, Shinji OKAZAKI, Shukuji ASAKURA, Isamu IWAMOTO, Hiroshi SHIMIZU

Analytical Science 17 i253 - i256 2001 [Reviewed]

Language：English Publishing type：Research paper (scientific journal) Publisher：The Japan Society for Analytical Chemistry Joint Work

Other Link： https://www.jstage.jst.go.jp/article/analscisp/17icas/0/17icas_0_i253/_article

A temperature-compensated sensor system for ozone detection

Hidemoto Nakagawa, Shinji Okazaki, Shukuji Asakura, Hironori Shimizu, Isao Iwamoto

The transactions of the Institute of Electrical Engineers of Japan 121-E ( 4 ) 199 - 203 2001 [Reviewed]

Language：English Publishing type：Research paper (scientific journal) Publisher：The Institute of Electrical Engineers of Japan Joint Work

Other Link： https://www.jstage.jst.go.jp/article/ieejsmas1995/121/4/121_4_199/_article

A novel method of temperature compensation for a stable combustion-type gas sensor

S Okazaki, H Nakagawa, S Asakura, H Shimizu, I Iwamoto

Sensors and Actuators 77 ( 1-2 ) 322 - 325 2001 [Reviewed]

DOI Web of Science

Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER Joint Work

A new ozone sensor for an ozone generator

Authors: H Nakagawa, S Okazaki, S Asakura, H Shimizu, I Iwamoto

Sensors and Actuators 77 ( 1-2 ) 543 - 547 2001 [Reviewed]

DOI Web of Science

Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER Joint Work

A prudent automated car ventilation system and driving data

Hidemoto Nakagawa, Shinji Okazaki, Shukuji Asakura, Hideo Akimoto, Jun Kubo

The transactions of the Institute of Electrical Engineers of Japan 121 ( 5 ) 237 - 242 2001 [Reviewed]

Language：English Publishing type：Research paper (other science council materials etc.) Publisher：The Institute of Electrical Engineers of Japan Joint Work

An automated car ventilation system

H. Nakagawa, S. Okazaki, S. Asakura, K. Fukuda, H. Akimoto, S. Takahashi, S. Shigemori

Sensors and Actuators B-CHEMICAL 65 ( 1-3 ) 133 - 167 2000 [Reviewed]

DOI Web of Science

Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER Joint Work

A fiber-optic evanescent-wave hydrogen gas sensor using palladium-supported tungsten oxide

S Sekimoto, H Nakagawa, S Okazaki, K Fukuda, S Asakura, T Shigemori, S Takahashi

Sensors and Actuators B-CHEMICAL 66 ( 1-3 ) 142 - 145 2000 [Reviewed]

DOI Web of Science

Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER Joint Work

Re-activation of an amperometric organophosphate pesticide biosensor by 2-pyridinealdoxine methochloride

S Okazaki, H Nakagawa, K Fukuda, S Asakura, H Kiuchi, T Shigemori, S Takahashi

Sensors and Actuators B-CHEMICAL 66 ( 1-3 ) 131 - 134 2000 [Reviewed]

Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER Joint Work

Other Link： https://www.sciencedirect.com/science/article/pii/S0925400500003221

A Re-usable Biosensor for Organophosphate Pesticides

OKAZAKI Shinji,NAKAGAWA Hidemoto,ASAKURA Shukuji,FUKUDA Kenzo,KIKUCHI Hiromi,TAKAHASHI Sachio,SHIGE … Show more authors

DENKI KAGAKU 66 ( 6 ) 615 - 619 1998 [Reviewed]

Language：English Publishing type：Research paper (scientific journal) Publisher：Electrochemical Society of Japan Joint Work

Reduction of Nitrate Ions by Iron Powder Coated with Copper in Neutral Solutions

OKAZAKI Shinji,SASAKI Hisashi,NAKAGAWA Hidemoto,ASAKURA Shukuji,FUKUDA Kenzo

DENKI KAGAKU 66 ( 6 ) 620 - 624 1998 [Reviewed]

Language：English Publishing type：Research paper (scientific journal) Publisher：Electrochemical Society of Japan Joint Work

A Single Mode Optical Fiber Pressure Sensor for Gas Insulated Equipments

Hidemoto Nakagawa, Shinji Okazaki, Shukuji Asakura, Kenzo Fukuda, Norio Takeuchi, Tetsuo Hayashi

The transactions of the Institute of Electrical Engineers of Japan 117-E ( 2 ) 100 - 104 1997 [Reviewed]

Language：English Publishing type：Research paper (scientific journal) Publisher：The Institute of Electrical Engineers of Japan Joint Work

Other Link： https://www.jstage.jst.go.jp/article/ieejsmas1995/117/2/117_2_100/_article

Biodegradation of toluene diamine(TDA) in activated sludge acclimated with aniline and TDA

S. Asakura, S. Okazaki

Chemosphere 30 ( 11 ) 2209 - 2217 1995 [Reviewed]

DOI Web of Science PubMed

Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER Joint Work

Nitrate-sensitive corroding metal electrode

Shukuji Asakura, Shinji Okazaki, Hidemoto Nakagawa, Kenzo Fukuda

Sensors and Actuators B-CHEMICAL 24 ( 1-3 ) 291 - 295 1995 [Reviewed]

DOI Web of Science

Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER Joint Work

Reduction of Nitrate Ions by Iron Powder Coated with Copper in Neutral Solutions

OKAZAKI Shinji,SASAKI Hisashi,NAKAGAWA Hidemoto,ASAKURA Shukuji,FUKUDA Kenzo

DENKI KAGAKU 62 ( 4 ) 354 - 355 1994 [Reviewed]

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Electrochemical Society of Japan Joint Work

Cathodic Reduction of Nitrate Ions at Copper Electrode in Neutral Solutions

OKAZAKI Shinji,et.al

DENKI KAGAKU 62 ( 4 ) 356 - 367 1994 [Reviewed]

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Electrochemical Society of Japan Joint Work

Reduction of Nitrate Ions with Devarda's Alloy

OKAZAKI Shinji,et.al

DENKI KAGAKU 62 ( 4 ) 358 - 359 1994 [Reviewed]

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Electrochemical Society of Japan Joint Work

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