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関連する概念動画

Distribution and Dispersion00:54

Distribution and Dispersion

Ecology is the study of how organisms interact with their environment and with one another. An important aspect of ecology is understanding where species are found and how individuals are distributed within those areas. The geographic range of a species refers to the total area where its members are located, while dispersion describes the pattern of spacing of individuals within that range.Geographic Range and Dispersion PatternsWithin a species’ geographic range, individuals may be distributed...
Electronic Distance Measuring Instruments01:30

Electronic Distance Measuring Instruments

Electronic Distance Measuring Instruments (EDMs) are essential tools in modern surveying, offering precise distance measurements by emitting electromagnetic signals and calculating the time required for these signals to travel to a target and return. Two primary types of signals are used in EDMs — light waves and microwaves — each suited to specific environmental and distance requirements. Light-wave-based EDMs utilize either infrared or laser light, providing high accuracy over short distances...
Design Example: Measuring Distance Between Two Points with Obstructions01:10

Design Example: Measuring Distance Between Two Points with Obstructions

When measuring distances in areas with physical obstructions, such as a lake in a field, surveyors must employ techniques to calculate accurate lengths without direct line measurements. One effective method is the offset technique, which allows for precise distance estimation over inaccessible stretches.In this scenario, a surveyor must measure a side of an area that crosses a lake. Since the measuring tape cannot span the lake, the surveyor begins by establishing a baseline that aligns with...
Distance Problem01:29

Distance Problem

When an object's velocity changes over time, the total distance traveled can be determined by summing small displacement intervals over short increments. This approach approximates the true distance through numerical summation and the use of integral calculus. An estimate of the total displacement can be obtained by measuring velocity at regular intervals and multiplying each value by the corresponding time step.If a runner accelerates over the first three seconds of a race, speed measurements...

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関連する実験動画

Updated: Jul 21, 2026

Measuring Spatially- and Directionally-varying Light Scattering from Biological Material
11:57

Measuring Spatially- and Directionally-varying Light Scattering from Biological Material

Published on: May 20, 2013

複数の方向で拡散を同時に測定する.

Xiao-Ping Tang1, Eric E Sigmund, Yi-Qiao Song

  • 1Department of Physics, University of Nevada, Reno, Nevada 89557, USA.

Journal of the American Chemical Society
|December 17, 2004
PubMed
まとめ

この研究は,完全な拡散テンソールを同時に測定するための新しい核磁気共振 (NMR) 方法を示しています. この技術は,複数の方向で同時に拡散測定を可能にし,材料の動態に関する洞察を提供します.

科学分野:

  • 物理 物理学 物理学とは
  • 化学 化学は化学です.
  • マテリアルサイエンス 材料科学

背景:

  • 拡散テンソールの測定は,材料の性質を理解するために非常に重要です.
  • 拡散テンサー画像 (DTI) の現在の方法は,時間がかかる可能性があります.
  • 拡散におけるアニゾトロピーは,価値ある構造的および動的情報を提供します.

研究 の 目的:

  • 完全拡散テンソール測定を同時に行うための新しい核磁気共振 (NMR) アプローチを導入する.
  • 単一のスキャンで複数の方向に沿って拡散データを取得するための効率的な方法を開発する.

主な方法:

  • 様々な方向の磁場グラディエントを利用して,核スピン磁化の複数の調節を誘導した.
  • 単一の実験スキャンで異なる調節を持つ複数のエコーを取得しました.
  • 同位体およびアニソトロピクの両方の実験システムで技術を実証しました.

主要な成果:

  • 完全拡散テンソールの同時測定のための新しいNMRアプローチを成功裏に実装し,検証しました.
  • 実験結果は,異なる方向に沿った拡散を同時に測定する能力を確認しました.
  • この方法は,イソトロピー系とアニソトロピー系の両方で有効であることが証明されました.

さらに関連する動画

Measuring Spray Droplet Size from Agricultural Nozzles Using Laser Diffraction
08:14

Measuring Spray Droplet Size from Agricultural Nozzles Using Laser Diffraction

Published on: September 16, 2016

A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
08:23

A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings

Published on: September 30, 2019

関連する実験動画

Last Updated: Jul 21, 2026

Measuring Spatially- and Directionally-varying Light Scattering from Biological Material
11:57

Measuring Spatially- and Directionally-varying Light Scattering from Biological Material

Published on: May 20, 2013

Measuring Spray Droplet Size from Agricultural Nozzles Using Laser Diffraction
08:14

Measuring Spray Droplet Size from Agricultural Nozzles Using Laser Diffraction

Published on: September 16, 2016

A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
08:23

A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings

Published on: September 30, 2019

結論:

  • 開発されたNMRアプローチは,完全な拡散テンソールの同時測定を提供します.
  • このテクニックは,液晶と電解質をメタステーブル状態でモニタリングする際に潜在的に応用できます.
  • また,多孔性ネットワークやin vivo生物学的システムにおける流動性に関する in situ 研究にも価値があります.