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相关概念视频

Time and frequency -Domain Interpretation of Phase-lag Control01:21

Time and frequency -Domain Interpretation of Phase-lag Control

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Phase-lag controllers are widely used in control systems to improve stability and reduce steady-state errors. A dimmer switch controlling the brightness of a light bulb serves as a practical example of phase-lag control, gradually adjusting the bulb's brightness. Mathematically, phase-lag control or low-pass filtering is represented when the factor 'a' is less than 1.
Phase-lag controllers do not place a pole at zero, but instead influence the steady-state error by amplifying any...
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Time and frequency -Domain Interpretation of Phase-lead Control01:24

Time and frequency -Domain Interpretation of Phase-lead Control

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Phase-lead controllers are commonly used in various control systems to enhance response speed and stability. Adjusting the brightness on a television screen offers a practical example of phase-lead control. When contrast is enhanced, a phase-lead controller is employed. Mathematically, phase-lead control is identified when the first parameter is smaller than the second.
The design of phase-lead control involves the strategic placement of poles and zeros to balance steady-state error and system...
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An idealized LC circuit of zero resistance can oscillate without any source of emf by shifting the energy stored in the circuit between the electric and magnetic fields. In such an LC circuit, if the capacitor contains a charge q before the switch is closed, then all the energy of the circuit is initially stored in the electric field of the capacitor. This energy is given by
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Limits with Oscillating Discontinuities01:19

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An oscillating discontinuity is a type of discontinuity in which a function’s values fluctuate infinitely often as the input approaches a particular point. Unlike jump discontinuities, where the function suddenly shifts between two values, or infinite discontinuities, where the function diverges without bound, an oscillating discontinuity arises from rapid back-and-forth variation. Because the function never stabilizes toward a single value, no finite limit exists at that point.One of the...
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Phase-lead and Phase-lag Controllers01:22

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Understanding the working function of different types of controllers can be illustrated with practical analogies, such as adjusting a stereo's volume equalizer. Cranking up the bass involves a phase-lead controller, which functions as a high-pass filter, while increasing the treble uses a phase-lag controller, which acts as a low-pass filter. PD controllers, similar to high-pass filters, enhance the system's response to high-frequency components. PI controllers, akin to low-pass...
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In the real world, oscillations seldom follow true simple harmonic motion. A system that continues its motion indefinitely without losing its amplitude is termed undamped. However, friction of some sort usually dampens the motion, so it fades away or needs more force to continue. For example, a guitar string stops oscillating a few seconds after being plucked. Similarly, one must continually push a swing to keep a child swinging on a playground.
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在分段时钟中控制合延迟同步振荡

Kumiko Yoshioka-Kobayashi1,2, Marina Matsumiya1,3, Yusuke Niino4

  • 1Institute for Frontier Life and Medical Sciences, Kyoto University, Kyoto, Japan.

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概括
此摘要是机器生成的。

疯狂边缘 (Lfng) 基因对于同步小鼠胚胎中的Hes7基因振荡至关重要. 通过Notch信号,Lfng调节细胞间的通信,确保适当的细胞细分,并防止发育缺陷.

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科学领域:

  • 发育生物学
  • 细胞振荡
  • 基因调控

背景情况:

  • 细胞活动通过细胞-细胞合在种群层面上得到协调.
  • 索米特细分时钟依赖于前索米特中皮 (PSM) 中同步的Hes7基因振荡.
  • 痕信号对于同步这些振荡至关重要,其抑制导致索米特融合.

研究的目的:

  • 阐明Notch信号调节Hes7振荡的同步机制.
  • 调查Notch调节器疯狂边缘 (Lfng) 在PSM细胞同步中的作用.

主要方法:

  • 使用与Hes7合的新型光报道器 (Achilles) 开发现场成像系统.
  • 在小鼠PSM中监测Hes7振荡的单细胞分辨率.
  • 野生类型和Lfng-nullPSM细胞的比较分析,包括分离和混合培养.
  • 视觉痕信号记者测试和数学建模.

主要成果:

  • 野生型细胞表现出Hes7振荡相位波动的快速纠正.
  • Lfng-null PSM 细胞显示非同步和减弱的 Hes7 振荡,表明 Lfng 在细胞-细胞合中的作用.
  • Lfng会延迟细胞间的Notch信号传输,而它的缺失会缩短这种合延迟.
  • 一种延长合延迟的化合物在Lfng-null PSM中部分挽救了Hes7振荡幅度和同步.

结论:

  • 通过控制细胞间合延迟, Lunatic fringe (Lfng) 对于保持PSM中的同步Hes7振荡至关重要.
  • 这项研究揭示了振荡网络中的延迟控制机制,对于部分细分至关重要.
  • 适当的细胞间合延迟对于发育过程中的同步振荡至关重要.