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相关概念视频

Time and frequency -Domain Interpretation of Phase-lead Control01:24

Time and frequency -Domain Interpretation of Phase-lead Control

82
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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Phase-lead and Phase-lag Controllers01:22

Phase-lead and Phase-lag Controllers

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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...
169
Electro-mechanical Systems01:19

Electro-mechanical Systems

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Electromechanical systems are intricate configurations that effectively combine electrical and mechanical elements to achieve a desired outcome. Central to many of these systems is the DC motor, a device that converts electrical energy into mechanical motion, enabling various applications ranging from simple fans to complex robotic mechanisms.
A key component of the DC motor is the armature, a rotating circuit positioned within a magnetic field. As an electric current passes through the...
946
Phase Changes01:19

Phase Changes

4.3K
Phase transitions play an important theoretical and practical role in the study of heat flow. In melting or fusion, a solid turns into a liquid; the opposite process is freezing. In evaporation, a liquid turns into a gas; the opposite process is condensation.
A substance melts or freezes at a temperature called its melting point and boils or condenses at its boiling point. These temperatures depend on pressure. High pressure favors the denser form of the substance, so typically, high pressure...
4.3K
Non-ohmic Devices00:51

Non-ohmic Devices

1.1K
In most substances, the current flow is proportional to the voltage applied to it. A simple relationship between the values of current, voltage, and resistance is known as Ohm's law. Nonohmic devices do not exhibit a linear relationship between voltage and current. One such device is the semiconducting circuit element known as a diode. A diode is a circuit device that allows current flow in only one direction.
Consider a simple circuit consisting of a battery, a diode, and a resistor. A...
1.1K
Time and frequency -Domain Interpretation of Phase-lag Control01:21

Time and frequency -Domain Interpretation of Phase-lag Control

88
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...
88

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Updated: Jun 27, 2025

Double Emulsion Generation Using a Polydimethylsiloxane PDMS Co-axial Flow Focus Device
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在设备上进行相位工程.

Xiaowei Liu1, Junjie Shan1, Tianjun Cao1

  • 1National Laboratory of Solid State Microstructures, School of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, China.

Nature materials
|April 25, 2024
PubMed
概括
此摘要是机器生成的。

设备上相位工程使两维材料中的新材料固态度成为可能. 该方法允许通过直接在设备上控制材料相和组成,在电子,量子和能源应用中定制性能.

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相关实验视频

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科学领域:

  • 材料科学 材料科学 材料科学
  • 凝聚物质物理学 凝聚物质物理学
  • 纳米技术纳米技术

背景情况:

  • 定制二维 (2D) 材料的相对于先进的应用至关重要.
  • 目前的相位过渡方法仅限于具有相同化学成分的材料.
  • 在相位转换过程中控制静电测量仍然是一个重大挑战.

研究的目的:

  • 引入设备上相位工程技术,用于在2D材料中创建具有不同化学固态度的多种晶格相.
  • 为了证明二化 (PdSe2) 转化为不同的固态相 (Pd17Se15和Pd4Se).
  • 展示这种方法在各种应用中的多功能性,包括超导,低接触电阻和电催化.

主要方法:

  • 使用和化物作为2D材料的模型系统.
  • 使用预先设计的电极在PdSe2通道内的化学成分比率的热量定制.
  • 精确控制电极厚度和间距,以实现不同的相位配置.

主要成果:

  • 通过调整化学成分比率,成功地将PdSe2转化为Pd17Se15和Pd4Se相.
  • 证明了在现场设计设备功能的能力,包括超导和超低接触电阻.
  • 展示了使用工程阶段的电催化剂的定制合成.

结论:

  • 设备上相位工程提供了一种新的途径,以在2D材料中实现多种化学固态度.
  • 这种方法提供了一种适用于29种金属-素组合的通用机制.
  • 该技术可以利用基本的材料特性用于多功能电子,量子和能源应用.