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  • 無衝突プラズマに対する変分原理を応用した磁気リコネクションの非線形解析

    廣田 真 , Morrison P. J.

    流体に対するオイラー方程式ではケルビンの循環定理によって、渦度の保存則が成り立つが、プラズマ(電離気体)の運動を記述する理想電磁流体方程式においても同様な磁束の保存則が成り立つ。一方、太陽表面や磁気圏、実験室プラズマでは磁気リコネクション(磁力線のつなぎ換え)が起きており、このような保存則の破れを説明するには、方程式に何らかの特異摂動を加える必要がある。しかし、荷電粒子の衝突による散逸効果(電気抵 …

    理論応用力学講演会 講演論文集 61(0), 35-35, 2012

    J-STAGE DOI

  • C104 四輪駆動電気自動車におけるスリップ率均等化トルク配分と航続距離延長(OS11 自動車の運動制御2)

    西原 修 , 熊澤 卓真

    … Electric power conservation technologies for electric vehicles have been an active area of research mainly for purpose of cruising range extensions. … In the present study, the energy loss owing to dissipation by slippage during acceleration is studied and analytical solutions are derived. … The energy conservation method via driving force distribution for an accelerating four-wheel drive vehicle is investigated. …

    「運動と振動の制御」シンポジウム講演論文集 2011(12), 157-162, 2011-06-28

  • 330 制駆動力配分による電気自動車の低消費電力化(車両駆動系の解析と制御,OS-16 運動と振動の制御,総合テーマ「伝統を,未来へ!」)

    西原 修 , 熊澤 卓真

    … It is important to increase the cruising range of electric vehicles, and therefore, electric power conservation technologies are being actively researched. … In the present study, the energy loss due to dissipation by slippage during acceleration is evaluated and analytical solutions are derived. … The conservation of energy via driving force distribution in an accelerating four-wheel drive vehicle is investigated. …

    Dynamics & Design Conference 2010, "330-1"-"330-6", 2010-09-14

  • スイッチング電源におけるMOSFETのオン抵抗の周波数特性とパルス損失計算の研究

    山村 英穂 , 佐藤 了平 , 岩田 剛治

    … Global efforts toward energy conservation, increasing data centers, and the increasing use of IT equipments are leading to a demand in reduced power consumption of equipments, and power efficiency improvement of power supply units is becoming a necessity. … As semiconductor technology reduces the ON-resistance of MOSFETs, frequency dependency due to the skin effect or proximity effect is anticipated.<br>In this study, ON-resistance of MOSFETs are measured and frequency dependency is confirmed. …

    電気学会論文誌. D, 産業応用部門誌 = The transactions of the Institute of Electrical Engineers of Japan. D, A publication of Industry Applications Society 130(5), 625-631, 2010-05-01

    J-STAGE DOI 参考文献24件

  • エネルギー保存・散逸を保証する段数4または9で構成される6次の差分スキーム

    石森 勇次

    力学系に対する数値計算法として,エネルギー関数の性質であるエネルギー保存や散逸性を壊さないような方法で,精度が6次の差分スキームを提案する。このスキームは2次のスキームを組み合わせることにより構成でき,段数4または9の陰解法となっている。

    富山県立大学紀要 16, 1-10, 2006-03-31

    CiNii PDF - オープンアクセス 

  • Spatially Accurate Dissipative or Conservative Finite Difference Schemes Derived by the Discrete Variational Method

    MATSUO Takayasu , SUGIHARA Masaaki , FURIHATA Daisuke , MORI Masatake

    Japan journal of industrial and applied mathematics 19(3), 311-330, 2002-10-01

    参考文献9件 被引用文献2件

  • Equivalent Representation of Mode Coupling in Two-Dimensional Bulk Waves Using Unitary Matrix with $4 \times 4$ Elements

    Ohki Michio , Toda Kohji

    … this differs from the conventional methods which involve a coupling between $N$ resonance systems solved as an eigenvalue problem of an $N \times N$ matrix, which becomes complicated when the loss phenomenon is included or when the value of $N$ increases. … The coupling is dealt with by considering the energy distribution between the two modes with unitarity or energy conservation. …

    Japanese journal of applied physics. Pt. 1, Regular papers & short notes 40(5B), 3505-3510, 2001-05-30

    応用物理学会 参考文献11件

  • 音響エネルギーの保存則に関する研究

    西岡 明

    … To explain the mechanism of sound generated by flow field, this paper proposes an equation of acoustic energy conservation which consists in general flow field. … The equation of conservation expresses law of acoustic energy conversions. … From this equation, it bacame clear that following things generate or dissipate sound. …

    日本機械学会論文集. C編 00067(00657), 1230-1234, 2001-05-25

    参考文献11件

  • Equivalent Representation of Mode Coupling in Two-Dimensional Bulk Waves Using Unitary Matrix with 4*4 Elements.

    Ohki Michio , Toda Kohji

    … matrix, which becomes complicated when the loss phenomenon is included or when the value of <I>N</I> … The coupling is dealt with by considering the energy distribution between the two modes with unitarity or energy conservation. …

    Japanese Journal of Applied Physics 40(5B), 3505-3510, 2001

    J-STAGE DOI

  • 音響利用技術  音響情報・音響エネルギー  音響エネルギーの保存則に関する研究

    西岡 明

    … To explain the mechanism of sound generated by flow field, this paper proposes an equation of acoustic energy conservation which consists in general flow field. … The equation of conservation expresses law of acoustic energy conversions. … From this equation, it bacame clear that following things generate or dissipate sound. …

    日本機械学会論文集 C編 67(657), 1230-1234, 2001

    J-STAGE DOI

  • Numerical Simulation of Combustion and Nongray Radiative Heat transfer in a Furnace and Its Comparison with Experiments

    Yoshimoto Takamitsu , Okamoto Tatsuyuki , Takagi Toshimi [他] , KATSUKI Masashi

    … The numerical computations were conducted based upon the conservation equations of mass, momentum, energy and species together with the k-ε turbulence model and the eddy dissipation model for estimating the combustion rate and the effective viscosity. … Radiative heat transfer was computed using the radiant heat ray method in combination with a weighted-sum-of-gray-gas model or a wide-band model. …

    JSME international journal. Ser. B, Fluids and thermal engineering 42(4), 752-759, 1999-11-01

    参考文献16件

  • Finite difference schemes for 〓=(〓)^α〓 that inherit energy conservation or dissipation property

    FURIHATA D.

    J. Comput. Phys. 156, 181-205, 1999

    被引用文献7件

  • Numerical Simulation of Combustion and Nongray Radiative Heat Transfer in a Furnace and Its Comparison with Experiments.

    YOSHIMOTO Takamitsu , OKAMOTO Tatsuyuki , TAKAGI Toshimi , KATSUKI Masashi

    … The numerical computations were conducted based upon the conservation equations of mass, momentum, energy and species together with the k-ε turbulence model and the eddy dissipation model for estimating the combustion rate and the effective viscosity. … Radiative heat transfer was computed using the radiant heat ray method in combination with a weighted-sum-of-gray-gas model or a wide-band model. …

    JSME International Journal Series B Fluids and Thermal Engineering 42(4), 752-759, 1999

    J-STAGE DOI

  • 炉内の燃焼と非灰色性を考慮した輻射伝熱の数値解析

    吉本 隆光 , 岡本 達幸 , 高城 敏美 [他] , 香月 正司

    … The numerical computations were conducted based upon the conservation equations of mass, momentum, energy and species together with k-ε turbulence model and eddy dissipation model for estimating combustion rate. … Radiative heat transfer was computed with the radiant heat ray method in combination with a weighted-sum-of-gray gas model or a wide-band model. …

    日本機械学会論文集. B編 00064(00626), 3391-3398, 1998-10-25

    参考文献15件 被引用文献2件

  • 場によって励起される音の研究 (第2報,Rijke管に対する解析)

    西岡 明

    … For a thermoacoustic refrigerator or combustion oscillation, the secondary effect of oscillation is a ruling factor. … The effects of excitation and dissipation for a Rijke tube are evaluated quantitatively. … An equation of acoustic energy conservation which is a ruling equation for local area is integrated, then each term is solved. …

    日本機械学会論文集. B編 00064(00624), 2444-2449, 1998-08-25

    参考文献8件 被引用文献1件

  • 炉内の燃焼と非灰色性を考慮したふく射伝熱の数値解析

    吉本 隆光 , 岡本 達幸 , 高城 敏美 , 香月 正司

    … The numerical computations were conducted based upon the conservation equations of mass, momentum, energy and species together with k-ε turbulence model and eddy dissipation model for estimating combustion rate. … Radiative heat transfer was computed with the radiant heat ray method in combination with a weighted-sum-of-gray gas model or a wide-band model. …

    日本機械学会論文集 B編 64(626), 3391-3398, 1998

    J-STAGE DOI

  • 場によって励起される音の研究 2  Rijke管に対する解析

    西岡 明

    … For a thermoacoustic refrigerator or combustion oscillation, the secondary effect of oscillation is a ruling factor. … The effects of excitation and dissipation for a Rijke tube are evaluated quantitatively. … An equation of acoustic energy conservation which is a ruling equation for local area is integrated, then each term is solved. …

    日本機械学会論文集 B編 64(624), 2444-2449, 1998

    J-STAGE DOI

  • ステップ型リ-フ先端部での反射境界条件および砕波限界

    筒井 茂明 , 座間味 健 , Tsutsui Shigeaki , Zamami Ken

    … According to the computational results of wave height distribution near the step-type reef by adopting the mild-slope equation with the conservation law of energy flux across the bathymetric discontinuity, reflection and transmission coefficients give suitable values for long period waves, but the reflection coefficient is underestimated for moderately shorter period waves. …

    琉球大学工学部紀要 (46), p63-74, 1993-09

    機関リポジトリ

  • A Global Gridpoint General Circulation Model

    Qing-cun Zeng , Chong-guang Yuan , Xue-hong Zhang , Xin-zhong Liang , Ning Bao

    … This leads the energy equation to a very compact form and the grid to a more flexible arrangement. … energy conservation (if the dissipation is omitted), and is free from computational modes. … <br> (4) The formulation and calculation of boundary terms or boundary conditions at the interfaces of atmosphere-ocean and atmosphere-land are physically consistent. …

    気象集誌. 第2輯 64A(0), 421-430, 1986

    DOI

  • On the vector optimization of heat exchange.

    NISHITANI HIROKAZU , KUNUGITA EIICHI , FAN LIANG T.

    … The possibility of improving the match between an energy source and an energy sink in an energy exchange system has been investigated to maximize both energy conservation and economic benefit. … Trade-off curves between the total dissipation of available energy (exergy) and the total area of heat exchangers in the system have been obtained under three situations. …

    JOURNAL OF CHEMICAL ENGINEERING OF JAPAN 15(6), 475-480, 1982

    J-STAGE DOI

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