On the sampling strategies and models for measuring diffusion exchange with a double diffusion encoding sequence
August 2023
Water exchange between the different compartments of a heterogeneous specimen can be characterized via diffusion magnetic resonance imaging (dMRI). Many analysis frameworks using dMRI data have been...
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The NMR core analyzing tomograph: a multi-functional tool for non-destructive testing of building materials
August 2023
NMR is becoming increasingly popular for the investigation of building materials as it is a non-invasive technology that does not require any sample preparation nor causes damage to the material. Depending...
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Dipolar NMR relaxation of adsorbates on surfaces of controlled wettability
August 2023
In reservoir rocks, the term “ageing” refers to extended exposition to crude oil; a typically water-wet sandstone will then gradually become oil-wet as a consequence of the deposition of insoluble fractions...
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Functional group resolved NMR relaxation of 3-carbon adsorbates in mesoporous alumina
August 2023
NMR relaxation analysis provides a unique and non-invasive probe of fluid dynamics within porous materials, and may be applied to the interpretation of a wide variety of material and interfacial characteristics....
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A potential NMR-based wettability index using free induction decay for rocks
August 2023
The wettability of reservoir rocks saturated with oil and water is one of the most important factors influencing petrophysics and oil recovery. Minerals with different wettability constitute the overall...
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RF power design optimization in MRI system
August 2021
Magnetic resonance image quality and patient safety have been the focus of engineering and research ever since the invention of equipment in the early 1970s. In high field (or ultrahigh field) MRI systems,...
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Solid-state NMR spectroscopy at ultrahigh resolution for structural and dynamical studies of MOFs
May 2023
To characterize the structure and dynamics of metal–-organic frameworks (MOFs) in-depth at the molecular level, it is necessary to pursue high-resolution solid-state magic angle spinning (MAS) nuclear...
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Low-field, high-gradient NMR shows diffusion contrast consistent with localization or motional averaging of water near surfaces
May 2023
Nuclear magnetic resonance (NMR) measurements of water diffusion have been extensively used to probe microstructure in porous materials, such as biological tissue, however primarily using pulsed gradient...
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Probing electronic structures of transition metal complexes using electron paramagnetic resonance spectroscopy
February 2023
Electron paramagnetic resonance (EPR) or electron spin resonance (ESR) has been widely employed to characterize transition metal complexes. However, because of the high degree of complexity of transition...
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Overview and progress of X-nuclei magnetic resonance imaging in biomedical studies
November 2023
Proton nuclear (1H) is the observed nucleus on which most magnetic resonance imaging (MRI) applications depend. Most traditional 1H MRI can provide structural and functional information about organisms,...
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A review of functional MRI application for brain research of Chinese language processing
February 2023
As one of the most widely used languages in the world, Chinese language is distinct from most western languages in many properties, thus providing a unique opportunity for understanding the brain basis...
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23Na relaxometry: An overview of theory and applications
May 2023
23Na is a nuclear magnetic resonance (NMR)-active isotope with a nuclear spin quantum number of 3/2. 23Na relaxation phenomenon is at the core of 23Na NMR measurement and analysis. Due to the dominance...
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Solid-state NMR in the field of drug delivery: State of the art and new perspectives
August 2021
In the last decades, a variety of nuclear magnetic resonance (NMR) techniques have been applied with success in the field of advanced functional materials, including the important area of drug delivery....
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Radicals on the silica surface: probes for studying dynamics by means of fast field cycling relaxometry and dynamic nuclear polarization
August 2023
Determining the dynamics of adsorbed liquids on nanoporous materials is crucial for a detailed understanding of interactions and processes on the solid-liquid interface in many materials and porous...
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Amide proton transfer imaging of Alzheimer's disease and Parkinson's disease
February 2023
Amide proton transfer (APT) magnetic resonance imaging (MRI) is an important molecular imaging technique at the protein level in tissue. Neurodegenerative diseases have a high likelihood of causing...
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Recent progress in fragment-based drug discovery facilitated by NMR spectroscopy
May 2022
Considerable developments have been observed in fragment-based lead/drug discovery (FBLD/FBDD) recently, with four drugs approved and many others under investigation. Nuclear magnetic resonance (NMR)...
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Brain structural plasticity in rats subjected to early binocular enucleation characterized by high resolution anatomical magnetic resonance imaging and diffusion tensor imaging
February 2023
Visual deprivation leads to structural neuroplasticity in the blind subjects, including gray matter (GM) and white matter (WM) atrophy and alterations in structural connectivity. The rat model of binocular...
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1H and 13C NMR spectral assignments for low-concentration bile acids in biological samples
November 2023
Bile acids are the main body of enterohepatic circulation in vivo. They have essential functions such as emulsifying fat, bacteriostasis and regulating multiple metabolic pathways as signal molecules....
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Evaluation of injuries caused by coronavirus disease 2019 using multi-nuclei magnetic resonance imaging
August 2021
The ongoing pandemic of coronavirus disease 2019 (COVID-19) has been a great burden for the healthcare system in many countries because of its high transmissibility, severity, and fatality. Chest radiography...
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Recent advances on surface metal hydrides studied by solid-state nuclear magnetic resonance spectroscopy
February 2023
Metal hydrides (M–H) on solid surfaces, i.e., surface M–H, are ubiquitous but critical species in heterogeneous catalysis, and their intermediate roles have been proposed in numerous reactions such...
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Prospects of borehole NMR instruments and applications
November 2022
Borehole nuclear magnetic resonance (NMR) is a powerful technology to characterize the petrophysical properties of underground reservoirs in the petroleum industry. The rising complexity of oil and...
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Using NMR-detected hydrogen-deuterium exchange to quantify protein stability in cosolutes, under crowded conditions in vitro and in cells
November 2023
We review the use of nuclear magnetic resonance (NMR) spectroscopy to assess the exchange of amide protons for deuterons (HDX) in efforts to understand how high concentration of cosolutes, especially...
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Numerical simulation study on the effect of temperature on the restricted diffusion in porous media
May 2023
It is of great significance to study how temperature affects the restricted diffusion in pores for an accurate evaluation of reservoir physical properties by using nuclear magnetic resonance (NMR) diffusion-transverse...
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The parallel-plate resonator: An RF probe for MR and MRI studies over a wide frequency range
November 2023
We explore the use of the parallel-plate resonator for the study of thin cuboid samples over a wide range of magnetic resonance frequencies. The parallel-plate resonator functions at frequencies from...
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Active shim coils design for Halbach magnet based on inverse boundary element method
August 2022
With advantages of small volume, high field strength, and compact stray field, the Halbach array magnet is of great potential in desktop NMR applications. However, field inhomogeneity poses a main obstacle...
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