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関連する概念動画

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...
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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
A photon is a discrete electromagnetic particle or bundle of energy. Photons are characterized by their frequency, wavelength, and amplitude, similar to the properties of a wave. Waves with higher frequencies transmit more energy and have shorter wavelengths than longer wavelengths that transmit...
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The Wave Nature of Light02:12

The Wave Nature of Light

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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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Photoreceptors and Plant Responses to Light02:00

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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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Control System Problem01:21

Control System Problem

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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.
When forming a closed-loop system, issues can arise if the poles cross into the unstable region, leading to potential...
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Blood Flow Imaging with Ultrafast Doppler
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サブサイクル制御による超高速電光灯

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.

Science (New York, N.Y.)
|September 29, 2018
PubMed
まとめ
この要約は機械生成です。

研究者らは超安定で低エネルギーフェムト秒パルスを 電気光学調節を用いて開発した. この技術は,モードロックなしでサブ光学サイクルのタイミングの精度を達成し,高度な量子と古典的なシステムの制御を可能にします.

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科学分野:

  • 物理学
  • 量子光学
  • レーザー技術

背景:

  • 超高速で超安定な光源は 量子と古典システムの 精密なタイミングと制御に不可欠です
  • モードロックレーザーは伝統的にこの能力を提供しますが,しばしば高いパルスエネルギーが必要です.

研究 の 目的:

  • 低エネルギーフェムト秒パルスの超安定制御のための適応可能な方法を実証する.
  • モードロックに頼らずにサブ光学サイクルのタイミングの精度を達成します.

主な方法:

  • 連続波レーザー光源の一般的な電光調節を使用します.
  • フェムト秒のパルス列を 高頻度で生成する

主要な成果:

  • 100ピコジュールのパルスレートを 30ギガヘルツまで達成しました
  • サブ・オプティカル・サイクルのタイミングの精度が証明された.
  • 近い赤外線領域にわたる有用な出力スペクトルを取得しました.

結論:

  • 開発された方法は,モードロックなしで数サイクル超高速パルスを生成するための新しいアプローチを提供します.
  • この高速で超安定な低エネルギー源は 非線形測定や 急速なトランジタの研究の可能性を広げています