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Related Concept Videos

Echo01:06

Echo

The human ear cannot distinguish between two sources of sound if they happen to reach within a specific time interval, typically 0.1 seconds apart. More than this, and they are perceived as separate sources.
Imagine the sound is reflected back to the ears. Assuming that the source is very close to the human, the difference between hearing the two sounds—the emitted sound and the reflected sound—may be more than the minimum time for perceiving distinct sounds. If this is the case, then the...
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Sampling Methods: Overview

A sample refers to a smaller subset representative of a larger population. In analytical chemistry, studying or analyzing an entire population is often impractical or impossible. Therefore, samples are used to draw inferences and generalize the whole population. The sampling method selects individuals or items from a population to create a sample. Standard sampling methods include random, judgemental, systematic, stratified, and cluster sampling. 
In analytical chemistry, the choice of sampling...
Sampling Methods: Sample Types01:18

Sampling Methods: Sample Types

Sampling materials are classified into three main types: solid, liquid, and gas.
Solid samples include a variety of substances, such as sediments from water bodies, soil, metals, and biological tissues. Two standard methods for extracting sediments from water bodies are grab sampling and piston coring. Grab sampling involves using a device to collect a discrete sediment sample from the bottom of a water body with minimal disturbance. Grab samples do not always represent the entire area due to...
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
Sampling Continuous Time Signal01:11

Sampling Continuous Time Signal

In signal processing, a continuous-time signal can be sampled using an impulse-train sampling technique, followed by the zero-order hold method. Impulse-train sampling involves the use of a periodic impulse train, which consists of a series of delta functions spaced at regular intervals determined by the sampling period. When a continuous-time signal is multiplied by this impulse train, it generates impulses with amplitudes corresponding to the signal's values at the sampling points.
In the...

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Multiple modulation multiple echoes: a one-shot method.

Yi-Qiao Song1

  • 1Schlumberger-Doll Research, 36 Old Quarry Road, Ridgefield, CT 06877, USA. ysong@slb.com

Magnetic Resonance Imaging
|April 19, 2005
PubMed
Summary
This summary is machine-generated.

A new Nuclear Magnetic Resonance (NMR) method determines diffusion constants in milliseconds. This fast NMR technique requires only a single scan, improving efficiency for diffusion measurements.

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Area of Science:

  • Physics
  • Chemistry
  • Materials Science

Background:

  • Diffusion is a fundamental process in various scientific disciplines.
  • Accurate measurement of diffusion constants is crucial for understanding material properties and chemical reactions.
  • Traditional methods for measuring diffusion constants can be time-consuming, often requiring multiple scans or complex experimental setups.

Purpose of the Study:

  • To review a novel Nuclear Magnetic Resonance (NMR) method for rapid diffusion constant determination.
  • To highlight the advantages of this technique, including speed and reduced scan requirements.
  • To discuss the applicability of the method with different magnetic field gradient configurations.

Main Methods:

  • The reviewed method utilizes Nuclear Magnetic Resonance (NMR) principles.
  • It employs a single-scan approach to measure diffusion.
  • The technique is compatible with both static and pulsed magnetic field gradients.

Main Results:

  • The NMR method can determine diffusion constants within milliseconds.
  • The need for multiple scans is eliminated, significantly enhancing measurement speed.
  • The method demonstrates versatility by working with both static and pulsed magnetic field gradients.

Conclusions:

  • This advanced NMR technique offers a rapid and efficient way to measure diffusion constants.
  • Its single-scan nature and compatibility with various gradient types make it a valuable tool for scientific research.
  • The method has the potential to accelerate studies in fields reliant on diffusion measurements.