論文
マイクロ波入射部最適化による マイクロ波探傷技術の高度化
著者:
佐々木 幸太,Kota SASAKI,遊佐 訓孝,Noritaka YUSA,若井 隆純,Takashi WAKAI,橋爪 秀利,Hidetoshi HASHIZUME
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Abstract: This study reports the development of a new microwave probe for the nondestructive testing of a pipe. Three-dimensional finite element simulations are carried out to optimize the profile of a microwave probe, whose results show that a probe with elliptic profile enables smaller reflection at the probes as well as much better single-mode propagation inside the pipe than conventional ones. Experimental validations are carried out using a straight brass pipe with an inner diameter of 39 mm and...
英字タイトル:
Enhancement of microwave nondestructive testing method for the inspection of pipes by optimizing the microwave probe profile
論文
ラオス国高校生の原子力エネルギーに対する知識調査
著者:
遊佐 訓孝,Noritaka YUSA
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This study conducted a survey to gather information on the knowledge of Laotian high school students on nuclear energy. This study prepared an original 11-pages textbook that briefly introduced nuclear energy and related matters in Lao. One hundred high school students belonging to a public high school with a good reputation in Savannakhet Province were requested to read the textbook approximately in a half day to tell subjective impression on the amount of prior knowledge on the contents of each sect...
英字タイトル:
Survey on the Knowledge of Laotian High School Students on Nuclear Energy
論文
固相接合を用いた 電磁非破壊検査のための模擬応力腐食割れ試験体製作技術
著者:
遊佐 訓孝,Noritaka YUSA,内一 哲哉,Tetsuya UCHIMOTO,高木 敏行,Toshiyuki TAKAGI,橋爪 秀利,Hidetoshi HASHIZUME
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This study proposes a method to fabricate an artificial defect that is almost identical to stress corrosion cracking from the viewpoint of electromagnetic nondestructive evaluations. The key idea is to realize a region having electrical resistance embedded inside a conductive materials using solid state bonding. A rough region is introduced into the surface of the materials to be bonded so that the region is partially bonded to realize electrical resistance. Experimental demonstrations are carried out...
英字タイトル:
Fabrication of imitative stress corrosion cracking specimens suitable for electromagnetic nondestructive evaluations using solid state bonding
論文
国民のエネルギー受容性に対する影響因子評価に向けたラオス国学生のエネルギーに対する意識調査
著者:
遊佐 訓孝,Noritaka YUSA,宋 海成,Haicheng SONG
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This study reports the results of questionnaire survey to evaluate the attitudes of Laotian students towards energy. The survey was conducted at four high schools in three cities, including Vientiane capital, in Lao PDR in 2017, and also at the Faculty of Engineering, National University of Laos, in 2015-2017. The results of the survey were compared with earlier publications reporting the results of similar surveys targeting Japanese university students. The results revealed that Laotian students plac...
英字タイトル:
Questionnaire survey of the attitude of Laotian students aiming at the discussion on the factors affecting the public attitudes toward energy
論文
沸騰水型炉内構造物インコネル溶接部に対する渦電流探傷逆解析技術の適用可能性評価
著者:
遊佐 訓孝,Noritaka YUSA,町田 栄治,Eiji MACHIDA,ラディスラブ ヤノーセック,Ladislav JANOUSEK,ミハイ レビカン Mihai REBICAN,陳 振茂,Zhenmao CHEN,宮 健三,Kenzo MIYA
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This paper evaluates the applicability of eddy current inversion techniques to the sizing of defects in Inconel welds with rough surfaces. For this purpose, a plate Inconel weld specimen, which models the welding of a stub tube in a boiling water nuclear reactor, is fabricated, and artificial notches machined into the specimen. Eddy current inspections using six probes in weld inspection evaluated. It is revealed that if suitable probes are applied, an Inconel weld does not provide large noise signals in ed...
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Applicability of eddy current inversion techniques to the sizing of defects in Inconel welds of BWR internals
論文
渦電流探傷試験における熱疲労割れの数値モデリング
著者:
遊佐 訓孝,Noritaka YUSA,橋爪 秀利,Hidetoshi HASHIZUME,Iikka VIRKKUNEN,Mika KEMPPAINEN
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Abstract. This study discusses a suitable numerical modeling of a thermal fatigue crack from the viewpoint of eddy current testing. Five artificial thermal fatigue cracks, introduced into type 304L austenitic stainless steel plates with a thickness of 25 mm, are prepared; and eddy current inspections are carried out to gather signals using an absolute type pancake probe and a differential type plus point probe. Finite element simulations are then carried out to evaluate a proper numerical model of the...
英字タイトル:
Numerical modeling of thermal fatigue cracks from the viewpoint of eddy current testing