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相关概念视频

Space-Time Curvature and the General Theory of Relativity01:17

Space-Time Curvature and the General Theory of Relativity

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In 1905, Albert Einstein published his special theory of relativity. According to this theory, no matter in the universe can attain a speed greater than the speed of light in a vacuum, which thus serves as the speed limit of the universe.
This has been verified in many experiments. However, space and time are no longer absolute. Two observers moving relative to one another do not agree on the length of objects or the passage of time. The mechanics of objects based on Newton's laws of...
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Space Trusses01:25

Space Trusses

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A space truss is a three-dimensional counterpart of a planar truss. These structures consist of members connected at their ends, often utilizing ball-and-socket joints to create a stable and versatile framework. The space truss is widely used in various construction projects due to its adaptability and capacity to withstand complex loads.
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State Space Representation01:27

State Space Representation

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The frequency-domain technique, commonly used in analyzing and designing feedback control systems, is effective for linear, time-invariant systems. However, it falls short when dealing with nonlinear, time-varying, and multiple-input multiple-output systems. The time-domain or state-space approach addresses these limitations by utilizing state variables to construct simultaneous, first-order differential equations, known as state equations, for an nth-order system.
Consider an RLC circuit, a...
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Space Trusses: Problem Solving01:29

Space Trusses: Problem Solving

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A space truss is a three-dimensional counterpart of a planar truss. These structures consist of members connected at their ends, often utilizing ball-and-socket joints to create a stable and versatile framework. Due to its adaptability and capacity to withstand complex loads, the space truss is widely used in various construction projects.
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Transfer Function to State Space01:23

Transfer Function to State Space

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State-space representation is a powerful tool for simulating physical systems on digital computers, necessitating the conversion of the transfer function into state-space form. Consider an nth-order linear differential equation with constant coefficients, like those encountered in an RLC circuit. The state variables are selected as the output and its n−1 derivatives. Differentiating these variables and substituting them back into the original equation produces the state equations.
In an RLC...
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State Space to Transfer Function01:21

State Space to Transfer Function

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The conversion of state-space representation to a transfer function is a fundamental process in system analysis. It provides a method for transitioning from a time-domain description to a frequency-domain representation, which is crucial for simplifying the analysis and design of control systems.
The transformation process begins with the state-space representation, characterized by the state equation and the output equation. These equations are typically represented as:
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Trajectory Data Analyses for Pedestrian Space-time Activity Study
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神经元在空间和时间上的特征

Isabel Holguera1, Claude Desplan2,3

  • 1Department of Biology, New York University, New York, NY 10003, USA.

Science (New York, N.Y.)
|October 13, 2018
PubMed
概括
此摘要是机器生成的。

了解神经元的多样性是解读功能电路的关键. 涉及转录因子和空间线索的保存发育程序指导了跨物种的神经元特征,单细胞RNA分析提供了新的见解.

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科学领域:

  • 神经科学
  • 发育生物学
  • 遗传学

背景情况:

  • 神经元的多样性对于功能电路组装至关重要.
  • 了解产生这种多样性的发展方案至关重要.

研究的目的:

  • 突出了神经元特异性的保存机制.
  • 描述这些机制是如何在不同的神经结构中使用的.
  • 确定神经元规范中的剩余问题.

主要方法:

  • 在神经元规范中保存发育原理的审查.
  • 突出转录因子和空间线索的作用.
  • 讨论单细胞RNA分析的可能性.

主要成果:

  • 在无脊椎动物和脊椎动物中存在神经元特征的共同发育原理.
  • 一系列的转录因子是时间模式的祖先.
  • 空间线索改变时间模式的结果.

结论:

  • 神经元规范依赖于保存的时间和空间模式机制.
  • 需要进一步的研究才能完全理解神经元的特征.
  • 单细胞RNA分析对表征神经元多样性和发育轨迹具有前景.