Articles

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  Low-field NMR VS High-field NMR: Same root and same source

  June 28, 2020 Blog

  The NMR family is huge and complex, including NMR spectroscopy, MRI, and relaxation NMR. Frequently heard are NMR spectroscopy, human body MRI, low field NMR, electron paramagnetic resonance, variable field NMR, and so on. Among the many nuclear magnetic brothers, NMR spectroscopy and human MRI are undoubtedly the "big brother" of the nuclear magnetic family. Whether it ...

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  Study on wettability of coal pores-Part 2

  June 19, 2020 Blog

  In-situ analysis of changes in the wetting ratio of different pore moisture Figure 4. Wetting rate of different types of pores at different treatment times The formula of coal wettability: Pt represents the measured porosity of coal pores, and P represents the total porosity of raw coal samples NMR Analyzer. The water wettability of coal pores directly refl ...

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  Study on wettability of coal pores-Part 1

  June 13, 2020 Blog

  Introduction As we know the principle of NMR test pore distribution, the first step is to fully saturate the sample with water, and then measure the original porosity and pore size distribution of the sample according to the correspondence between the relaxation time of the water in the pore and the pore radius. For samples such as pulverized coal and soil, the origin ...

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  Changes in the pore structure of expansive soil under the action of dry-wet cycle-Part3

  June 4, 2020 Blog

  Discussion Expansion characteristics discussion Water absorption and swelling is a process in which pores are gradually filled with water, NMR Analyzer and a process of gradually transitioning from an unsaturated state to a saturated state. ①In the initial expansion stage, the saturation is low. Due to the small soil-water contact angle, a small amount of water en ...

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  Changes in the pore structure of expansive soil under the action of dry-wet cycle-Part2

  May 29, 2020 Blog

  Expansion curves under different cycles Figure 2 shows the soil sample expansion curve under 0-4 dry and wet cycles. NMR Analyzer Because the soil sample is laterally restricted by the ring knife, only vertical deformation occurs. The vertical expansion is the volume expansion of the soil sample. The volume expansion increases by about 20% after the first cycle, and the ...

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  Changes in the pore structure of expansive soil under the action of dry-wet cycle-Part1

  May 21, 2020 Blog

  Introduction Expansive soil is a special clay with high expansion, multi-cracks, and over-consolidation characteristics, distributed in more than 40 countries including China, the United States and Canada. NMR Analyzer Due to rainfall and evaporation, this soil will undergo a dry-wet cycle. Since expansive soil contains hydrophilic minerals such as montmorillonite and i ...

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