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49sick89hack's profile
言語を解する蛇
言語を解する蛇
言語を解する蛇
@49sick89hack

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言語を解する蛇

@49sick89hack

人の足元を這うだけの、何一つ誇れることのない蛇ですニョロ。素人なので優しくしてほしいニョロ。いい加減なことを言う時に変な語尾を付けるニョロ。

あんだーぐらうんど
trtmfile.com
Joined April 2011

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    言語を解する蛇‏ @49sick89hack Oct 20

    「筋肉はどうしてアイソメトリック(等尺)でも疲労するのか」については、「筋肉は長さの変化ではなく『張力』に対してエネルギーを支払っているから」という言い方が出来て、物理の人の納得しやすい言い方をするなら「筋肉の中の分子が微小な運動を繰り返すことで張力が生み出されているから」となる。

    5:20 PM - 20 Oct 2019
    • 44 Retweets
    • 212 Likes
    • 彼方 游浬沙 銀こんにゃく ぱきしる 〆コンコン🦊🍶💫@人権侵害 Makoto Moriphology がんす taaaaiki Re:que🇵🇱
    2 replies 44 retweets 212 likes
      1. 言語を解する蛇‏ @49sick89hack Oct 20

        『張力』というのは結局『収縮力』なのだけど、「収縮しなくてもエネルギーが消費される」という文脈を説明するためには『等尺性』の仮定を置いといた方が都合が良いのです。『等尺性』を仮定すると『収縮力』は『張力』と等価にみなせる。

        0 replies 14 retweets 34 likes
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      2. 言語を解する蛇‏ @49sick89hack Oct 20

        アイソメトリック(等尺性収縮)の例は「重いものを持った時」というのも一例だけど、「ボディビルダーのポージング」なんかはもっと分かりやすいニョロ。あの静止した姿勢にかなりのエネルギーが注がれている。人体は拮抗筋に等しく張力を生むことで「静止したまま全力を出す」事が可能。

        1 reply 14 retweets 45 likes
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      3. 言語を解する蛇‏ @49sick89hack Oct 20

        言い換えると、人体は「筋肉の長さの変化(≒肢位の変化)」とある程度独立に「張力の変化」をコントロールできることになる。これが好都合なのは「フィードバック」のコントロールが利くこと。力学的なフィードバックは「ロボットがドアを開けられない」こととも関連する問題。 https://img.gifmagazine.net/gifmagazine/images/700593/original.gif …

        1 reply 14 retweets 47 likes
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