著者
大庭 拓也 山田 幸一 岡田 信之 相馬 仁 谷藤 克也
出版者
一般社団法人 日本機械学会
雑誌
日本機械学会論文集 C編 (ISSN:03875024)
巻号頁・発行日
vol.75, no.757, pp.2459-2467, 2009-09-25 (Released:2017-06-09)
参考文献数
17
被引用文献数
3 2

Rolling stock has been generally inspected and maintained on the basis of the preventive maintenance. However, the reliability of the sensors and information technology has drastically improved, and with this background the objective of this research is to develop the condition monitoring system for the bogies of the Shinkansen cars. This paper describes an algorithm for detecting fault in some parts of bogies. This scheme is based on the statistic analysis of vibration acceleration during some period. This algorithm named peak average method detects the difference of the vibration peak distribution between fault cases and normal ones. For examining the possibility to detect fault in the bogie, experiments simulating some fault modes in bogie parts are conducted in the rolling stock test plant at Komaki Research Center of CJRC. From the results of these experiments, we can show the reliability and the validation of this scheme for monitoring conditions of Shinkansen bogies developed in this research.
著者
亀田 佳代子 松原 健司 水谷 広 山田 佳裕
出版者
The Ornithological Society of Japan
雑誌
日本鳥学会誌 (ISSN:0913400X)
巻号頁・発行日
vol.51, no.1, pp.12-28, 2002 (Released:2007-09-28)
参考文献数
43
被引用文献数
21 26

全国で増加傾向にあり,内水面漁業への食害が懸念されているカワウについて,これまで行われてきた調査や研究をもとに,日本のカワウの採食魚種,食物のサイズ構成と採食量,採食場所選択の特徴についてまとめた.カワウは多様な魚種を食物としており,採食可能な魚類の体長幅は約3~30cm,野外で一日に必要な食物量は約500gと推定された.カワウはまた,季節や生息場所の状況に応じて,淡水域,汽水域,海域の採食場所を柔軟に使い分けていた.安定同位体比分析の結果から,カワウには地域個体群としての採食場所選択のほかに,個体ごとの採食場所選択の特徴があることが示唆された.これらの結果から,カワウの食性解析の研究は,魚食性鳥類の採餌戦略という鳥類生態学の課題としても,食害問題など野生鳥獣の保護管理における課題としても,今後さらに発展させていく必要があると考えられた.
著者
山田 剛治 鈴木 俊之 高柳 大樹 藤田 和央
出版者
一般社団法人 日本航空宇宙学会
雑誌
日本航空宇宙学会論文集 (ISSN:13446460)
巻号頁・発行日
vol.57, no.670, pp.426-436, 2009 (Released:2009-11-25)
参考文献数
22
被引用文献数
1 1

A free piston double diaphragm shock tube with 70 × 70mm cross-section at test section was newly developed for the purpose of investigating nonequilibrium phenomena behind a shock wave. This paper presents the performance of the shock tube and the measurement system newly developed. Experimental investigation to clarify its characteristics was conducted for various operational parameters, such a rupture pressure of the first diaphragm and initial pressures of the low pressure tube, the high pressure tube, and the compression tube. Based on the characteristics experiment, a performance map of the shock tube was obtained by changing the operation parameters. The result shows that the shock tube is capable of generating the shock layer corresponding to the super orbital reentry flight conditions. The newly developed measurement system enables us to obtain the spatial distribution of spectra behind a shock wave with high spatial and time resolution. A description of the measurement system and typical examples of the measured spectra are presented.
著者
網田 和宏 大沢 信二 杜 建国 山田 誠
出版者
日本温泉科学会
雑誌
温泉科学 (ISSN:00302821)
巻号頁・発行日
vol.55, no.2, pp.64-77, 2005-09-30
参考文献数
33
被引用文献数
6
著者
南里 智之 槇納 智裕 米川 康 原田 憲邦 安藤 裕志 山田 孝
出版者
公益社団法人 砂防学会
雑誌
砂防学会誌 (ISSN:02868385)
巻号頁・発行日
vol.60, no.5, pp.23-30, 2008-01-15 (Released:2010-04-30)
参考文献数
24
被引用文献数
2

A volcanic mudflow chronology spanning the past 40, 000 years was developed for the Furano River, which is located on the foot of Mt. Tokachi, using stratigraphic analysis, radiocarbon dating, dendrochronology and historical archives. Mt. Tokachi is one of the most active volcanoes in Japan, and its volcanic eruptions have often caused large-scale mudflows like the 1926 event that caused 144 deaths along the Furano and Biei Rivers. To develop local programs for preventing volcanic disasters, knowledge of past disasters accompanied with volcanic mudflow chronologies are required. We have identified 14 total mudflows during the past 40, 000 years that occurred along the Furano River, including events in A.D. 1926, AD. 1857, AD. 1740, A.D. 1150-1690, A.D. 600-900, 1, 900 YBP, two in 2, 000-2, 300 YBP, 3, 200 YBP, 3, 500 YBP, 3, 700 YBP, 7, 500 YBP, 13, 500 YBP, and 39, 000 YBP. Some of them were also crosschecked with historical archives. Of the fourteen mudflows, a total of 11 occurred during the past 4, 000 years, and 8 occurred during the past 2, 000 years. These high-frequency mudflows aggraded the valley channel and riverbed to the elevation of Kami-Furano City's central part, which was not damaged by the 1926 mudflow. Therefore, the next mudflow will easily reach the city's center and increase overall damage. It is generally suggested that the frequency and magnitude of volcanic mudflows will work synergistically in increasing the risk of sediment disasters.
著者
吉田 和人 山田 耕司 玉城 将 内藤 久士 加賀 勝
出版者
一般社団法人 日本体育学会
雑誌
体育学研究 (ISSN:04846710)
巻号頁・発行日
pp.13068, (Released:2014-04-21)
参考文献数
19
被引用文献数
6 4

The rotation speed of the ball spin has been considered a key factor in winning table tennis matches. This study quantified the rotation speed (rotations per second, rps) of service balls delivered by quarter-finalists in the 2009 World Table Tennis Championships. Ball services were recorded during the quarter-finals of both the men's and women's singles, involving 4 matches and 8 players per gender, using a high-speed video camera (1000 fps) for calculation of the rotation speed, and a standard video camera (30 fps) for distinguishing players and aces (including those touched by the receiver). Eventually, the rotation speeds of 329 services were calculated, and these ranged from 13.7 to 62.5 rps. For men, 50-60 rps was the most frequent (40.0%) range of the rotation speeds, while for women, the corresponding range was 40-50 rps (43.8%); the average (±SD) rotation speed was significantly greater for men than for women (46.0±9.0 vs. 39.2±9.3 rps, p<0.001). The fastest rotation speed was 62.5 rps for both genders. Chinese men produced a slower rotation speed than did other men (43.5±8.9 vs. 51.0±6.8 rps, p<0.001). For women, however, the rotation speed was similar between Chinese players and the others (39.9±10.2 vs. 38.5±8.2 rps). The rotation speeds of aces were scattered over a wide range of 37.0-58.8 rps for men and 27.8-62.5 rps for women, implying a weak association between aces and fast rotation. These pioneering data may help clarify some of the technical and tactical aspects of table tennis, and can be used to develop training and game strategies for successful performance.
著者
山田 茂 田中 涼子 大橋 文 岩田 華苗
出版者
実践女子大学
雑誌
実践女子大学生活科学部紀要 = Bulletin of Jissen Women's University Faculty of Human Life Sciences (ISSN:13413244)
巻号頁・発行日
vol.54, pp.31-35, 2017-03-10

In this experiment, we investigated the effects of mechanical stimulation and caffeine on lipolysis in the adipocyte culture cell. Caffeine (0μg/mℓ, 50μg/mℓ, 100μg/mℓ) which promotes lipolysis, was added to the culture medium (10%FBS, DMEM) respectively. Adipocytes underwent repeated mechanical irritation by Flexer cell strain unit to observe the effect on the lipolysis of mechanical stimulation. We measured glycerol in a culture medium to confirm the lipolysis. Adipocyte were stained for lipolysis responses by Oil Red O. The effect of caffeine on lipolysis was slightly observed, but a significant effect statistically was not observed. On the other hand, mechanical stimulation increased lipolysis in the adipocyte culture cells. Influences of a combination of mechanical stimulation and caffeine on lipolysis were examined. The results of these experiments, the effect of mechanical stimulation on the lipolysis was outstanding, but was scarcely effected by caffeine. That is, direct mechanical stimulation was effective in increasing the burning of fat. Further research is required on the mechanisms of mechanical stimulation to promote lipolysis in adipose cells.
著者
山田 正栄
出版者
合成樹脂工業協会
雑誌
熱硬化性樹脂 (ISSN:03884384)
巻号頁・発行日
vol.13, no.3, pp.178-192, 1992-09-10 (Released:2012-08-20)
参考文献数
19
被引用文献数
1

自動車部品分野における軽量化, コストダウンを目的とした金属部品の樹脂化が進展する中で, この分野におけるガラス繊維強化フェノール樹脂成形材料の需要は目ざましい伸びを示している。過酷な条件下で長期の信頼性が要求される自動車部品に多く使用されているのは, ガラス繊維強化フェノール樹脂成形材料が持つ優れた耐熱性, 機械強度, 寸法安定性, 耐薬品性等が認められたことに他ならない。一方では熱硬化性樹脂に共通の「脆さ」, 金属と比較した場合の「摩耗」など改良すべき余地も残っており, 諸物性の向上, 新機能の付加などにより今後も用途拡大が図られよう。本稿では, 金属材料及び熱可塑性エンジニアリングプラスチックスと比較しながら, ガラス繊維強化フェノール樹脂成形材料の特長を主に概説する。
著者
山田 進 今村 俊幸 町田 昌彦
出版者
一般社団法人 日本計算工学会
雑誌
日本計算工学会論文集 (ISSN:13478826)
巻号頁・発行日
vol.2006, pp.20060027-20060027, 2006 (Released:2006-09-28)
参考文献数
16

In order to improve the convergence property of the preconditioned conjugate gradient (PCG) method for solving eigenvalue problems of the Hamiltonian matrix, we propose a new preconditioning method. The preconditioner utilizes not only an approximate eigenvalue which is obtained during the CG iterations but also its residual error. We demonstrate that the PCG method with the new preconditioner can solve the eigenvalue problem for the Hamiltonian matrix several times faster than the PCG method with the conventional preconditioner.
著者
安場 健一郎 藤尾 拓也 渡邊 勝吉 多根 知周 山田 竜也 内村 優希 吉田 裕一 後藤 丹十郎 田中 義行
出版者
農業情報学会
雑誌
農業情報研究 (ISSN:09169482)
巻号頁・発行日
vol.26, no.4, pp.155-163, 2017 (Released:2017-12-28)
参考文献数
22
被引用文献数
2

施設内外の夜間のCO2濃度の計測値を利用して,隙間換気回数と施設内でのCO2発生速度を推定するソフトウェアを開発した.開発したソフトウェアはパーソナルコンピュータ上で動作し,ユビキタス環境制御システム(UECS)に準拠したCO2計測ノードが導入された施設で利用可能である.冬期間締め切った施設では夜間,土壌や植物から発生するCO2によってCO2濃度が上昇する.隙間換気回数と施設内からのCO2発生によってCO2の上昇曲線が決まる.開発したソフトウェアで,隙間換気回数推定のためのデータ収集期間を設定すると,自動的にその期間のCO2濃度を記録する.その期間の終了時に,非線形回帰分析を利用して,隙間換気回数と施設のCO2発生速度を自動的に推定する.また,計算したこれらの推定値を利用して,日中,換気開始前までの施設内での光合成速度を推定する機能を実装した.また,電子メールによってこれらの計算結果をリアルタイムにユーザーに伝達する機能を実装し,推定値の把握を容易にした.本ソフトウェアを利用することでCO2測定ノードが導入されていれば,簡単に隙間換気回数,施設内でのCO2発生速度を推定可能で,施設内でのCO2環境や省エネルギなどの施設内環境の改善に活用できると考えられた.