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439 results on '"Kageyama, Koji"'

11. In situ diagnostics of damage accumulation in Ni-based superalloy

Author

Kageyama, Koji, Reed, Roger, and Korsunsky, Alexander

Abstract

There has been a significant interest in capturing how the damage is initiated and accumulated in polycrystalline Ni-based superalloys while applying thermal and mechanical impact - tensile and creep loading at 800◦C. This is because the turbine component in jet propulsion or power generation these materials applied can experience such environments while in service and need to avoid unexpected degradation and failure causing severe accidents. In situ damage observation techniques required to be developed to understand the sequential mechanisms of damage growth even in such complicated environment. In this work, for the first time in this field, a design and operation of laboratory-scale X-ray computed tomography (XCT) arrangement is developed for the purpose of in situ damage observation. The in situ XCT technique covers high-temperature mechanical testing and improvements of tomography image processing for high resolution enables to capture the sequential damage growth during tensile or creep loading at 800◦C, in examples of polycrystalline Ni-based superalloys, Inconel 718 and Nimonic 80A. Furthermore, laser-based Acoustic Emission (AE) techniques are combined with the system to determine whether the object is damaged to be captured by XCT. The developed in situ observation technique was applied to high-temperature tensile and creep testing. Our results indicated that the damage growth could be captured with the resolution of 30 µm at 800◦C, and can be compared not only with strain rate and loading condition but with the stress state of the deformed testpiece, and that AE the technique can be the damage indicator of the object by observing the change in AE energy and frequency.

Published
2020

14. A rapid quarantine approach for the pathogenic and invasive Phytophthora species associated with imported fruits in China.

Author

Duan, Jiaying, Ma, Haiting, Wang, Wenxin, Li, Yaling, Shi, Xiaoyu, Chen, Xiaowei, Kageyama, Koji, Yan, Yaping, and Li, Mingzhu

Subjects
RESTRICTION fragment length polymorphisms, POLYMERASE chain reaction, PHYTOPATHOGENIC microorganisms, INTRODUCED species, FOOD safety
Abstract

BACKGROUND: Phytophthora spp. represent a pivotal genus of plant pathogens with a global distribution, exerting significant deleterious effects on food safety and forestry ecosystems. Numerous pathogenic and invasive Phytophthora species, introduced through imported fruits, have been frequently detected at Chinese ports. With the rise in global trade activities, the plant quarantine of imported fruits is becoming increasingly important but challenging. Fast, simple, and labor‐saving techniques are necessary and anticipated. RESUITS: A polymerase chain reaction restriction fragment length polymorphism capillary electrophoresis (PCR‐RFLP‐CE) technology‐based quarantine approach was developed for 16 Phytophthora species associated with the imported fruits in China. The Ypt1 gene, exhibiting abundant interspecific variations, was selected as the marker gene for PCR. The restriction endonuclease AluI was proven to be capable and compatible in simultaneously separating different Phytophthora species during CE. By combining with a fast and efficient DNA extraction kit, the developed PCR‐RFLP‐CE technique was successfully applied to identify Phytophthora species in artificially infested fruits. CONCLUSION: We provide a quick, practical, and high‐throughput detection approach for hazardous and invasive Phytophthora species associated with imported fruits in China. This strategy can give good convenience and technological support for carrying out massive quarantine activities at Chinese ports. © 2024 Society of Chemical Industry. [ABSTRACT FROM AUTHOR]

Published
2024
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34. Phytophthora niederhauserii sp. nov., a polyphagous species associated with ornamentals, fruit trees and native plants in 13 countries

Author

Abad, Z. Gloria, Abad, Jorge A., Cacciola, Santa Olga, Pane, Antonella, Faedda, Roberto, Moralejo, Eduardo, Pérez-Sierra, Ana, Abad-Campos, Paloma, Alvarez-Bernaola, Luis A., Bakonyi, József, Józsa, András, Herrero, Maria Luz, Burgess, Treena I., Cunnington, James H., Smith, Ian W., Balci, Yilmaz, Blomquist, Cheryl, Henricot, Béatrice, Denton, Geoffrey, Spies, Chris, Mcleod, Adele, Belbahri, Lassaad, Cooke, David, Kageyama, Koji, Uematsu, Seiji, Kurbetli, İlker, and Değirmenci, Kemal

Published
2014

35. A Novel Medium for Isolating Two Japanese Species in the Fusarium graminearum Species Complex and a Dipstick DNA Chromatography Assay for Species Identification and Trichothecene Typing

Author

Suga, Haruhisa, primary, Hayashi, Masahiro, additional, Kushiro, Masayo, additional, Miyano, Norichika, additional, Inoue, Hiroyoshi, additional, Nakajima, Kaori, additional, Kawakami, Taku, additional, Tonooka, Takuji, additional, Nakajima, Takashi, additional, Shimizu, Masafumi, additional, and Kageyama, Koji, additional

Published
2022
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38. A LAMP-based toolbox developed for detecting the major pathogens affecting the production and quality of the Chinese medicinal crop Aconitum carmichaelii Debx.

Author

Liu, Jingzhe, primary, Liang, Mengyi, additional, Lin, Tao, additional, Zhao, Qing, additional, Wang, Huiqin, additional, Yang, Shunyuan, additional, Guo, Qian, additional, Wang, Xinyi, additional, Guo, Hua, additional, Cui, Langjun, additional, Yan, Yaping, additional, Hieno, Ayaka, additional, Kageyama, Koji, additional, Suga, Haruhisa, additional, and Li, Mingzhu, additional

Published
2022
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