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関連する概念動画

Moment of a Couple: Problem Solving01:30

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The moment of couple is an essential concept in physics and engineering, used to calculate the rotational force, or torque, that is created when a couple —two equal and opposite forces—acts on an object.
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When in group settings, we are often influenced by the thoughts, feelings, and behaviors around us. Groupthink is another phenomenon of conformity where modification of the opinions of members in a group aligns with what they believe is the group consensus (Janis, 1972). In such situations, the group often takes action that individuals would not perform outside the group setting because groups make more extreme decisions than individuals do. Moreover, groupthink can hinder opposing trains of...
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Consider a truss structure with frictionless joints fixed to a wall and roller support. If a force of 150 N is applied to joint A, the forces in each member of the truss can be determined using the method of joints.
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The method of joints is a commonly used technique to analyze the forces in structural trusses. The method is based on the principle of equilibrium, which assumes that the truss members are connected by frictionless pins. The forces at each joint can be determined by considering the equilibrium of the forces acting on that joint. Consider a truss structure with two forces of 20 N and 10 N acting at joints C and D, respectively. The method of joints can be used to determine the forces FCB, FDC,...
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頭をつなぐこと

Derek E G Briggs1,2, Luke A Parry3

  • 1Department of Earth and Planetary Sciences, Yale University, New Haven, CT, USA.

Science (New York, N.Y.)
|November 24, 2022
PubMed
まとめ
この要約は機械生成です。

カンブリア紀の化石は 節足類の脳の進化の起源を明らかにしています この発見は これらの成功した無脊椎動物の 古代の神経解剖学に関する 重要な洞察を与えてくれます

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科学分野:

  • 古生物学
  • 神経科学
  • 進化生物学

背景:

  • 節足類は非常に多様で古代の無脊椎動物を代表しています
  • 神経系と 特に脳の進化を理解することは 生態学的な成功の鍵です

研究 の 目的:

  • 節足類の脳構造の初期進化を調査する
  • カンブリア化石の証拠と 既存の節足類の神経解剖学的発達との関係を確立する.

主な方法:

  • カンブリア期に保存された 節足類化石の分析
  • 化石と現代の節足類の脳を比較する神経解剖学
  • 脳の進化の遺伝的再構築

主要な成果:

  • 化石の証拠は カンブリア期における 祖先の節足類の脳における 分割を示している.
  • 化石で見られる分断された脳構造は,現存する節足類に見られるものと同型である.
  • このセグメンテーションは,関節足の重要な進化の放射に先立ちます.

結論:

  • 分断された脳は 節足類の進化における 古代からある特徴です
  • カンブリア紀の化石は 節足類の神経系が 初期に組織されていたことを 直接証明しています
  • この発見は現代の節足類の神経生物学につながる 発達と進化の経路の理解を深めるものです