基于电子显微学的原子级三维重构技术对揭示材料的微观结构,加深材料结构和性能关系的理解具有极为重要的意义。原子级电子断层成像技术(atomic electron tomography,AET)作为当前最先进的三维重构技术之一,已先后成功表征了纳米颗粒中...基于电子显微学的原子级三维重构技术对揭示材料的微观结构,加深材料结构和性能关系的理解具有极为重要的意义。原子级电子断层成像技术(atomic electron tomography,AET)作为当前最先进的三维重构技术之一,已先后成功表征了纳米颗粒中原子位置、晶体缺陷、早期形核过程中原子的动态变化及非晶态固体的三维原子结构。本文综述了AET的流程及应用的突破,以期望读者了解AET的基本原理流程和应用,并探讨未来AET在解决物理、化学、材料科学等领域基础问题的前景与挑战。展开更多
Inertia-gravity waves play an increasingly important role in the middle atmosphere dynamics. As a result, more attention has been paid to the study of inertia-gravity waves, especially to the middle atmosphere gravity...Inertia-gravity waves play an increasingly important role in the middle atmosphere dynamics. As a result, more attention has been paid to the study of inertia-gravity waves, especially to the middle atmosphere gravity waves. This paper presents some aspects of inertia-gravity waves with emphasis on the propagation. Two methods are used here, namely, geometric optical method and physical optical method. We can see from the study that inertia-gravity waves are similar to planetary waves in some respects and they are different from planetary waves in others.展开更多
The gravity wave breaking is crucial to the large-scale circulation of middle atmosphere. In this paper, we follow Lindzen (1981) to draw out the parameterization of two-dimensional gravity wave breaking including ine...The gravity wave breaking is crucial to the large-scale circulation of middle atmosphere. In this paper, we follow Lindzen (1981) to draw out the parameterization of two-dimensional gravity wave breaking including inertial effect. Also we present some properties of critical levels and inertial critical levels.展开更多
文摘基于电子显微学的原子级三维重构技术对揭示材料的微观结构,加深材料结构和性能关系的理解具有极为重要的意义。原子级电子断层成像技术(atomic electron tomography,AET)作为当前最先进的三维重构技术之一,已先后成功表征了纳米颗粒中原子位置、晶体缺陷、早期形核过程中原子的动态变化及非晶态固体的三维原子结构。本文综述了AET的流程及应用的突破,以期望读者了解AET的基本原理流程和应用,并探讨未来AET在解决物理、化学、材料科学等领域基础问题的前景与挑战。
文摘Inertia-gravity waves play an increasingly important role in the middle atmosphere dynamics. As a result, more attention has been paid to the study of inertia-gravity waves, especially to the middle atmosphere gravity waves. This paper presents some aspects of inertia-gravity waves with emphasis on the propagation. Two methods are used here, namely, geometric optical method and physical optical method. We can see from the study that inertia-gravity waves are similar to planetary waves in some respects and they are different from planetary waves in others.
文摘The gravity wave breaking is crucial to the large-scale circulation of middle atmosphere. In this paper, we follow Lindzen (1981) to draw out the parameterization of two-dimensional gravity wave breaking including inertial effect. Also we present some properties of critical levels and inertial critical levels.
