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相关概念视频

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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相关实验视频

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

同时测量多个方向的扩散.

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
概括

本研究提出了一种新的核磁共振 (NMR) 方法,用于同时测量完整的扩散张力. 这种技术可以同时在多个方向进行扩散测量,为材料动力学提供了洞察力.

科学领域:

  • 物理 物理学 物理
  • 化学 化学 化学
  • 材料科学 材料科学 材料科学

背景情况:

  • 扩散张力测量对于理解材料特性至关重要.
  • 目前用于扩散张力成像 (DTI) 的方法可能耗时.
  • 扩散中的 anisotropy 提供了有价值的结构和动态信息.

研究的目的:

  • 引入一种新的核磁共振 (NMR) 方法,用于同时进行全扩散张力测量.
  • 开发一种有效的方法,在单个扫描中沿多个方向获取扩散数据.

主要方法:

  • 利用不同方向的磁场梯度来诱导核自旋磁化的多个调制.
  • 在单个实验扫描中获得了不同调制的多个回声.
  • 在同otropic 和 anisotropic 实验系统中展示了该技术.

主要成果:

  • 成功实施和验证了一种新的NMR方法,用于同时进行全扩散张力测量.
  • 实验结果证实,可以同时测量不同方向的扩散.
  • 该方法在同otropic 和 anisotropic 系统中都被证明是有效的.

结论:

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  • 开发的NMR方法可以同时测量完整的扩散张量.
  • 这种技术在监测超稳定的液晶和电解质中具有潜在的应用.
  • 它也可能对孔隙网络和体内生物系统的流动性实地研究有价值.