nuclear magnetic relaxation

简明释义

核磁弛豫

英英释义

例句

1.The principles of nuclear magnetic relaxation 核磁弛豫 are applied in various fields including chemistry and physics.

《核磁弛豫核磁弛豫》的原理应用于化学和物理等多个领域。

2.In MRI, nuclear magnetic relaxation 核磁弛豫 times are crucial for image contrast.

在MRI中，核磁弛豫核磁弛豫时间对图像对比度至关重要。

3.The study of nuclear magnetic relaxation 核磁弛豫 helps in understanding molecular dynamics.

对核磁弛豫核磁弛豫的研究有助于理解分子动态。

4.Understanding nuclear magnetic relaxation 核磁弛豫 mechanisms can improve diagnostic imaging techniques.

理解核磁弛豫核磁弛豫机制可以改善诊断成像技术。

5.Researchers measured the nuclear magnetic relaxation 核磁弛豫 rates to analyze the sample's properties.

研究人员测量了核磁弛豫核磁弛豫速率以分析样品的特性。

作文

Nuclear magnetic relaxation is a fascinating phenomenon that plays a crucial role in the field of nuclear magnetic resonance (NMR) spectroscopy. To understand this concept, we first need to delve into what nuclear magnetic resonance entails. NMR is a powerful analytical technique used primarily in chemistry and medicine to determine the structure of molecules and to study various physical properties of materials. It relies on the magnetic properties of atomic nuclei, particularly those of hydrogen atoms, which are abundant in organic compounds. When a sample is placed in a strong magnetic field, the nuclei of certain isotopes resonate at specific frequencies. This resonance occurs because the magnetic field causes the nuclei to align with the field, and when they are disturbed by an external radiofrequency pulse, they absorb energy and transition to a higher energy state. After the pulse is turned off, the nuclei begin to return to their original state, releasing energy in the form of radio waves. This process of returning to equilibrium is known as nuclear magnetic relaxation (核磁弛豫). There are two main types of relaxation processes: T1 relaxation, also known as longitudinal relaxation, and T2 relaxation, or transverse relaxation. T1 relaxation refers to the time it takes for the magnetization vector to return to its equilibrium position along the direction of the magnetic field. This process is influenced by various factors, including the molecular environment and interactions between neighboring nuclei. On the other hand, T2 relaxation involves the loss of coherence among the spins of the nuclei, leading to a decay of the transverse magnetization. Understanding these relaxation mechanisms is essential for interpreting NMR spectra accurately.The significance of nuclear magnetic relaxation extends beyond mere academic interest. In medical imaging, particularly magnetic resonance imaging (MRI), the principles of NMR and relaxation are applied to create detailed images of the human body. By manipulating the relaxation times of different tissues, radiologists can distinguish between healthy and diseased tissues, making MRI an invaluable tool for diagnosis and treatment planning. Moreover, nuclear magnetic relaxation has applications in various scientific fields, including material science, biology, and even food science. Researchers utilize NMR to investigate the dynamics of proteins and other biomolecules, providing insights into their structure and function. In food science, NMR techniques can be employed to analyze the composition and quality of food products, ensuring safety and enhancing flavor. In conclusion, nuclear magnetic relaxation is a fundamental aspect of NMR that facilitates a deeper understanding of molecular behavior and interactions. Its applications are vast and varied, impacting not only scientific research but also practical fields such as medicine and food safety. As technology advances, the study of nuclear magnetic relaxation will undoubtedly continue to evolve, leading to new discoveries and innovations that can benefit society as a whole.

核磁弛豫是一个迷人的现象，在核磁共振（NMR）光谱学领域中扮演着至关重要的角色。要理解这个概念，我们首先需要深入了解核磁共振的含义。NMR是一种强大的分析技术，主要用于化学和医学领域，以确定分子的结构并研究材料的各种物理性质。它依赖于原子核的磁性特性，特别是氢原子的特性，这在有机化合物中非常丰富。当样品置于强磁场中时，某些同位素的核以特定频率共振。这种共振发生是因为磁场使核与场对齐，当它们受到外部射频脉冲干扰时，它们吸收能量并转变到更高的能量状态。当脉冲关闭后，核开始返回到其原始状态，以无线电波的形式释放能量。这个返回到平衡的过程被称为核磁弛豫。弛豫过程主要有两种类型：T1弛豫，也称为纵向弛豫，以及T2弛豫或横向弛豫。T1弛豫指的是磁化矢量沿磁场方向返回到其平衡位置所需的时间。这个过程受到多种因素的影响，包括分子环境和相邻核之间的相互作用。另一方面，T2弛豫涉及核自旋之间的相干性丧失，导致横向磁化的衰减。理解这些弛豫机制对于准确解释NMR光谱至关重要。核磁弛豫的重要性超出了单纯的学术兴趣。在医学成像中，特别是磁共振成像（MRI）中，NMR和弛豫的原理被应用于创建人体的详细图像。通过操控不同组织的弛豫时间，放射科医生可以区分健康组织和病变组织，使得MRI成为诊断和治疗计划中不可或缺的工具。此外，核磁弛豫在多个科学领域也有应用，包括材料科学、生物学，甚至食品科学。研究人员利用NMR研究蛋白质和其他生物分子的动态，为其结构和功能提供了深入的见解。在食品科学中，NMR技术可以用于分析食品产品的组成和质量，确保安全并增强风味。总之，核磁弛豫是NMR的一个基本方面，促进了对分子行为和相互作用的更深入理解。它的应用广泛而多样，影响不仅限于科学研究，还包括医学和食品安全等实际领域。随着技术的进步，核磁弛豫的研究无疑将继续发展，带来新的发现和创新，造福整个社会。