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関連する概念動画

Magnetic Declination01:19

Magnetic Declination

46
Magnetic declination is the angle between true north, which aligns with the Earth's rotational axis, and magnetic north, which follows the direction of the Earth's magnetic field. This discrepancy exists because the magnetic poles do not coincide with the geographic poles. The value of magnetic declination depends on the observer's location on Earth and is subject to changes over time due to the dynamic nature of the Earth's magnetic field.The declination is called eastern when magnetic north...
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Doppler Effect - II01:05

Doppler Effect - II

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The Doppler effect has several practical, real-world applications. For instance, meteorologists use Doppler radars to interpret weather events based on the Doppler effect. Typically, a transmitter emits radio waves at a specific frequency toward the sky from a weather station. The radio waves bounce off the clouds and precipitation and travel back to the weather station. The radio frequency of the waves reflected back to the station appears to decrease if the clouds or precipitation are moving...
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Meridians01:28

Meridians

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In surveying, meridians are vital reference lines to measure directions and establish accurate land orientations. Meridians run from the north to the south poles, providing a stable framework for angular measurements and mapping. Meridians are fundamental in survey design, with the primary types being astronomic, magnetic, and assumed meridians. Each type offers distinct benefits and limitations, selected based on the project's scale and precision needs.The astronomic meridian is aligned with...
379
Azimuths and Bearings01:19

Azimuths and Bearings

116
Azimuths and bearings are essential concepts in surveying, providing methods to express the direction of a line relative to a meridian. Azimuths refer to the clockwise angle measured from the north end of a reference meridian to the given line, ranging from zero to 360 degrees. This method gives a comprehensive directional reference within a full 360-degree circle, making it a straightforward way to communicate direction in various fields, including navigation, cartography, and...
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Doppler Effect - I00:56

Doppler Effect - I

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The Doppler effect and Doppler shift were named after the Austrian physicist and mathematician Christian Johann Doppler in 1842, who conducted experiments with both moving sources and moving observers. Consider an observer standing on a street corner, observing an ambulance with a siren sound passing by at a constant speed. The observer experiences two characteristic changes in the sound of the siren. Initially, the sound increases in loudness as the ambulance approaches and decreases in...
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Speed of a Transverse Wave01:13

Speed of a Transverse Wave

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The speed of a wave depends on the characteristics of the medium. For example, in the case of a guitar, the strings vibrate to produce the sound. The speed of the waves on the strings and the wavelength determine the frequency of the sound produced. The strings on a guitar have different thicknesses but may be made of similar material. They have different linear densities, and the linear density is defined as the mass per length.
One of the key properties of any wave is the wave speed. Light...
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Updated: Jun 28, 2025

Quasi-light Storage for Optical Data Packets
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海上の光学時計

Jonathan D Roslund1, Arman Cingöz2, William D Lunden2

  • 1Vector Atomic, Inc., Pleasanton, CA, USA. jon@vectoratomic.com.

Nature
|April 24, 2024
PubMed
まとめ
この要約は機械生成です。

研究者らは 携帯用のコンパクトな光学時計を開発しました この高度な時計は 高い精度と環境への無感性を備えており 航海や将来の計時ネットワークにとって 極めて重要です

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科学分野:

  • 物理学
  • メトロロジー
  • 量子技術

背景:

  • 実験室の光学時計は高精度 (10−18 分の不精度以下) を達成する.
  • 既存の輸送可能な光学時計は,サイズ,環境感度,コストの制限があり,その有用性を制限しています.
  • 正確なタイムキーピングは ナビゲーション,地質学的モニタリング,量子ネットワークに不可欠です.

研究 の 目的:

  • モバイルプラットフォームでの動作に適したコンパクトで環境に優しい光学時計を開発する.
  • 困難な海上環境で高度な光学時計の使用の実現可能性を実証する.

主な方法:

  • 分子ヨウ素スペクトロメーター,ファイバー周波数,制御電子を統合した35リットルの光学時計の開発.
  • 海軍の船で20日間,このような3つの時計の継続的な操作とテストを行いました.

主要な成果:

  • 開発された光学時計は環境条件に無感性を示し,海上で継続的に動作しました.
  • 時計の誤差は1日300ピコ秒未満でした.
  • この時計はアクティブ水素マザーに匹敵する性能を達成したが,その容量の10分の1にしか及ばなかった.

結論:

  • この研究は,光学クロック技術の重要な進歩であり,モバイルプラットフォームへの導入を可能にします.
  • 海上での成功例は,海上での高性能時計の運用に伴う歴史的な課題を克服しました.
  • これによって 将来の光学的時刻計測ネットワークと 強化されたナビゲーションシステムへの道が開けます