低场核磁共振：弛豫和扩散的多维实验

近年来，低场核磁共振日益展示其在弛豫与扩散测量中的有效应用。在材料研究领域，诸如催化剂的研制、水泥的水化、岩石及土壤中的液体输运等，以及地质勘探和医疗诊断学中的人体组织性质的表征方面，核磁共振的弛豫与扩散测量都十分重要。特别是此技术在多维度方法方面的发展，大大促进了其在多孔材料方面的应用。多孔材料在人们生活的环境中无所不在，其微结构（微米级至毫米级）对于其性质和应用方面，具有决定性的作用。该文概述低场核磁共振的弛豫及扩散的多维度技术的基本原理、核磁共振方法学及其应用的若干关键性进展。

Low Field Magnetic Resonance：Multi-Dimensional Experiments of Relaxation and Diffusion

In recent years, low-field magnetic resonance has increasingly demonstrated its application of relaxation and diffusion measurements for the study of materials, catalysts, cement hydration, fluid transport in rocks and soil, geological prospecting, and characterization of tissue properties for medical diagnosis. In particular, the application on porous materials has benefited tremendously from the development in the multi-dimensional methods. Porous media are ubiquitous in our environment and their microstructure (mm to mm scale) is essential in determining their properties and applications. This article will summarize a few key advances in basic physics and NMR methodology, and their applications.