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関連する概念動画

Relative Motion Analysis using Rotating Axes-Problem Solving01:29

Relative Motion Analysis using Rotating Axes-Problem Solving

855
Consider a crane whose telescopic boom rotates with an angular velocity of 0.04 rad/s and angular acceleration of 0.02 rad/s2. Along with the rotation, the boom also extends linearly with a uniform speed of 5 m/s. The extension of the boom is measured at point D, which is measured with respect to the fixed point C on the other end of the boom. For the given instant, the distance between points C and D is 60 meters.
Here, in order to determine the magnitude of velocity and acceleration for point...
855
Angular Momentum about an Arbitrary Axis01:11

Angular Momentum about an Arbitrary Axis

513
Imagine a rigid body with a mass denoted as 'm', which has its center of mass at point G and is rotating around an inertial reference frame. The angular momentum at an arbitrary point P can be calculated by taking the cross product of the position vector and linear momentum vector for each individual mass element.
The velocity of a mass element comprises its translational velocity and the relative velocity instigated by the body's rotation. Substituting the velocity equation into...
513
Relative Motion Analysis using Rotating Axes01:25

Relative Motion Analysis using Rotating Axes

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Consider a component AB undergoing a linear motion. Along with a linear motion, point B also rotates around point A. To comprehend this complex movement, position vectors for both points A and B are established using a stationary reference frame.
However, to express the relative position of point B relative to point A, an additional frame of reference, denoted as x'y', is necessary. This additional frame not only translates but also rotates relative to the fixed frame, making it...
1.1K
Rotation with Constant Angular Acceleration - I01:37

Rotation with Constant Angular Acceleration - I

9.2K
If angular acceleration is constant, then we can simplify equations of rotational kinematics, similar to the equations of linear kinematics. This simplified set of equations can be used to describe many applications in physics and engineering where the angular acceleration of a system is constant.
Using our intuition, we can begin to see how rotational quantities such as angular displacement, angular velocity, angular acceleration, and time are related to one another. For example, if a flywheel...
9.2K
Angular Momentum01:21

Angular Momentum

998
Angular momentum characterizes an object's rotational motion and is defined as the moment of its linear momentum about a specified point O. When a particle moves along a curved path in the x-y plane, the scalar formulation calculates the magnitude of its angular momentum, utilizing the moment arm (d), representing the perpendicular distance from point O to the line of action of the linear momentum. Despite being scalar in formulation, angular momentum is inherently a vector quantity. Its...
998
Rotation with Constant Angular Acceleration - II01:16

Rotation with Constant Angular Acceleration - II

7.8K
Kinematics is the description of motion. The kinematics of rotational motion discusses the relationships between rotation angle, angular velocity, angular acceleration, and time. One can describe many things with great precision using kinematics, but kinematics does not consider causes. For example, a large angular acceleration describes a very rapid change in angular velocity without any consideration of its cause. Thus, rotational kinematics does not represent the laws of nature.
The first...
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MPI CyberMotion Simulator: Implementation of a Novel Motion Simulator to Investigate Multisensory Path Integration in Three Dimensions
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ランドマークの指向と角度経路の統合のためのニューラルダイナミクス

Johannes D Seelig1, Vivek Jayaraman1

  • 1Janelia Research Campus, Howard Hughes Medical Institute, 19700 Helix Drive, Ashburn, Virginia 20147, USA.

Nature
|May 15, 2015
PubMed
まとめ
この要約は機械生成です。

フルーツフライは,視覚的なランドマークと経路の統合を使用してナビゲートし,これらのシグナルを脳の形体で組み合わせます. このニューラルネットワークは,暗闇でも方向感覚を維持し,短期記憶を助ける可能性があります.

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Deep-Learning Based Multi-Joint Synchronous Tracking for Objective Quantification of Hindlimb Locomotor Kinematics in Rats
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科学分野:

  • 神経科学は神経科学である.
  • 動物の行動 動物の行動
  • 計算神経科学とは

背景:

  • 動物は,視覚的なランドマークとパスの統合を使用してナビゲートします.
  • 哺乳類のヘッド・ディレクション・セルは,地標と自己運動のシグナルを統合して方向性を決定する.
  • ドロソフィラ・メラノガスターの円形体は,脳の中央構造である.

研究 の 目的:

  • ドロソフィラ・メラロノガスターが,ランドマークベースの指向と角形の経路統合をどのように組み合わせているかを調査する.
  • ハエの空間的指向の基礎となる神経機構を特定する.
  • ナビゲーションと記憶における体体の役割を探求する.

主な方法:

  • 頭を固定したドロソフィラ・メラノガスターの2フォトンカルシウムイメージング.
  • 歩くボールを使った仮想現実のアリーナを利用する.
  • エリプソイド体ニューロンの集団反応を分析する.

主要な成果:

  • エリプソイド体のニューラル集団は,地標と自己運動のシグナルを統合して方向性を決定する.
  • 神経群は,その環境に対するハエのアジムスをコードする.
  • このネットワークにおける持続的な活動は,暗示が欠けるときの短期記憶における役割を示唆している.
  • ニューロンのダイナミクスと配置は,リングアトラクターネットワークの特性を示唆しています.

結論:

  • エリプソイドの体は,ハエの空間的指向のための視覚的および自己運動のシグナルを統合します.
  • このネットワークは,持続的な活動を通じて方向表現を維持し,短期記憶を潜在的にサポートします.
  • この発見は,リングアトラクターネットワークメカニズムがフライナビゲーションに関与していることを示唆している.