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相关概念视频

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.
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Light Acquisition02:16

Light Acquisition

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In order to produce glucose, plants need to capture sufficient light energy. Many modern plants have evolved leaves specialized for light acquisition. Leaves can be only millimeters in width or tens of meters wide, depending on the environment. Due to competition for sunlight, evolution has driven the evolution of increasingly larger leaves and taller plants, to avoid shading by their neighbors with contaminant elaboration of root architecture and mechanisms to transport water and nutrients.
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Light as Energy01:35

Light as Energy

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The energy required to carry out photosynthesis is light— typically electromagnetic radiation from the sun. The range of all possible wavelengths is known as the electromagnetic spectrum.
Photons
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The nature of light has been a subject of inquiry since antiquity. In the seventeenth century, Isaac Newton performed experiments with lenses and prisms and was able to demonstrate that white light consists of the individual colors of the rainbow combined together. Newton explained his optics findings in terms of a "corpuscular" view of light, in which light was composed of streams of extremely tiny particles traveling at high speeds according to Newton's laws of motion.
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Light plays a significant role in regulating the growth and development of plants. In addition to providing energy for photosynthesis, light provides other important cues to regulate a range of developmental and physiological responses in plants.
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In an open-loop system, such as a basic thermostat, the poles of the transfer function influence the system's response but do not determine its stability. However, when feedback is introduced to form a closed-loop system, such as an advanced thermostat that adjusts heating based on room temperature, stability is governed by the new poles of the closed-loop transfer function.
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Blood Flow Imaging with Ultrafast Doppler
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具有子循环控制的超快电光灯

David R Carlson1, Daniel D Hickstein2, Wei Zhang2

  • 1Time and Frequency Division, National Institute of Standards and Technology, 325 Broadway, Boulder, CO 80305, USA. david.carlson@nist.gov scott.papp@nist.gov.

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概括
此摘要是机器生成的。

研究人员开发了一种使用电光调制的超稳定,低能量的秒脉冲的新方法. 这种技术可以在没有模式锁定的情况下实现次光学周期定时精度,从而实现先进的量子和经典系统控制.

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科学领域:

  • 物理
  • 量子光学
  • 激光技术

背景情况:

  • 超快速和超稳定的光源对于精确的定时和控制量子和经典系统至关重要.
  • 模式锁定激光器传统上提供这种功能,但通常需要高脉冲能量.

研究的目的:

  • 展示一种可适应的低能量秒脉冲的超稳定控制方法.
  • 在不依赖模式锁定的情况下实现次光学周期定时精度.

主要方法:

  • 使用常见的连续波激光光源的电光调制.
  • 产生高重复率的五秒脉冲列车.

主要成果:

  • 在30千兆赫时达到100比克的脉冲.
  • 证明了次光学周期计时的精度.
  • 获得了近红外范围的有用输出光谱.

结论:

  • 开发的方法提供了一种创新的方法,可以在没有模式锁定的情况下产生少数周期的超快脉冲.
  • 这种高速,超稳定,低能耗的光源为非线性测量和研究快速变态提供了可能性.