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関連する概念動画

Precipitation Gravimetry01:03

Precipitation Gravimetry

Precipitation gravimetry is based on converting an analyte into a sparingly soluble precipitate, which is separated by filtration and weighed. An ideal precipitate should be pure, insoluble, of known composition, and easily filtered from the reaction mixture.
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
Coriolis Force01:23

Coriolis Force

An accelerating particle experiences a force equal to the mass multiplied by the acceleration in an inertial frame of reference. Consider a particle in a non-inertial frame of reference, such as a sliding ball on a rotating table. The acceleration of the ball in this rotating reference frame is different than in the intertial frame, which modifies its equation of motion. The fictitious forces acting additionally on a rotating frame of reference alter Newton's Second Law expression. Centripetal...
Resistivity01:22

Resistivity

When a voltage is applied to a conductor, an electrical field is generated, and charges in the conductor feel the force due to the electrical field. The current density that results depends on the electrical field and the properties of the material. In some materials, including metals at a given temperature, the current density is approximately proportional to the electrical field. In these cases, the current density can be modeled as:
Types of Global Positioning System Surveys01:30

Types of Global Positioning System Surveys

GPS surveying methods vary in application, accuracy, and data collection techniques, catering to diverse surveying and mapping needs. Static GPS, kinematic GPS, and real-time kinematic (RTK) surveying are widely used. Each technique offers distinct advantages.Static GPS involves placing one receiver at a known reference point and another at the target point. It collects exact positional data by observing multiple satellite ranges over an extended period, achieving centimeter-level accuracy for...
Magnetic Field Of A Current Loop01:16

Magnetic Field Of A Current Loop

Consider a circular loop with a radius a, that carries a current I. The magnetic field due to the current at an arbitrary point P along the axis of the loop can be calculated using the Biot-Savart law.
Magnetostatic Boundary Conditions01:28

Magnetostatic Boundary Conditions

An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...

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関連する実験動画

Updated: Jul 11, 2026

Investigating the Relationship between Sea Surface Chlorophyll and Major Features of the South China Sea with Satellite Information
10:28

Investigating the Relationship between Sea Surface Chlorophyll and Major Features of the South China Sea with Satellite Information

Published on: June 13, 2020

海流のリモートセンシング

R M Goldstein, H A Zebker, T P Barnett

    Science (New York, N.Y.)
    |December 8, 1989
    PubMed
    まとめ

    新しい合成開口レーダー (SAR) メソッドは,海洋表面電流を正確に測定します. このリモートセンシング技術により,世界の海流のモニタリングの可能性が示されています.

    科学分野:

    • 海洋学 海洋学とは
    • リモートセンシング (リモートセンサー)
    • 地質物理学 地質物理学とは地質物理学です.

    背景:

    • 海流の正確な測定は,海洋のダイナミクスと気候を理解するために不可欠です.
    • 表面電流を測定するための従来の方法は,労働集約的で,限られた空間的カバーを提供します.

    研究 の 目的:

    • 合成開口レーダー (SAR) を使用して,地表近くの海流を測定するための新しいリモートセンシング技術を導入し,検証する.

    主な方法:

    • 単一のSAR送信機と2つの受信アンテナを使用して,インターフェロメトリックSAR画像シーンを撮影しました.
    • SARシーン間の相差を分析して,表面電流速度に正比例するインターフェログラムを生成しました.

    主要な成果:

    • フィールドテストでは,SARテクニックの精度が実証され,平均フロー27-56cm/s (約20%の精度) の平均フローで5-10cm/sの平方根平均誤差が示されました.

    結論:

    • 開発されたSARインターフェロメトリー方法は,海洋表面電流を測定するための有望で正確な遠隔アプローチを提供します.
    • 宇宙での実装の可能性があり,この技術は,海洋表面電流の日常的なグローバルなモニタリングを可能にします.

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