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相关概念视频

Computed Tomography01:10

Computed Tomography

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Tomography refers to imaging by sections. Computed tomography (CT) is a non-invasive imaging technique that uses computers to analyze several cross-sectional X-rays to reveal minute details about structures in the body.
The technique was invented in the 1970s and is based on the principle that as X-rays pass through the body, they are absorbed or reflected at different levels. In the technique, a patient lies on a motorized platform while a computerized axial tomography (CAT) scanner rotates...
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Positron Emission Tomography01:29

Positron Emission Tomography

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Positron emission tomography (PET) is a medical imaging technique involving radiopharmaceuticals — substances that emit short-lived radiation. Although the first PET scanner was introduced in 1961, it took 15 more years before radiopharmaceuticals were combined with the technique and revolutionized its potential.
One of the main requirements of a PET scan is a positron-emitting radioisotope, which is produced in a cyclotron and then attached to a substance used by the part of the body...
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Electron Microscope Tomography and Single-particle Reconstruction01:07

Electron Microscope Tomography and Single-particle Reconstruction

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Transmission electron microscopy (TEM) can be used to determine the 3D structure of biological samples with the help of techniques such as electron microscope tomography and single-particle reconstruction. While single-particle reconstruction can examine macromolecules and macromolecular complexes in vitro conditions only, tomography permits the study of cell components or small cells in vivo.
Electron Tomography
Electron tomography can be performed either in TEM or STEM (scanning transmission...
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相关实验视频

Updated: Mar 20, 2026

Author Spotlight: Integrating Ultrasound Imaging with Biochemical Markers for Thyroid Disease Diagnosis
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使用威尔逊线的布洛赫状态断层扫描

Tracy Li1, Lucia Duca1, Martin Reitter1

  • 1Fakultät für Physik, Ludwig-Maximilians-Universität München, Schellingstrasse 4, 80799 Munich, Germany. Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str. 1, 85748 Garching, Germany.

Science (New York, N.Y.)
|May 28, 2016
PubMed
概括
此摘要是机器生成的。

研究人员使用蜂格中的超冷原子直接观察电子带结构的几何结构. 这种方法揭示了带固态和拓不变量,推进了凝聚物质物理学.

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相关实验视频

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科学领域:

  • 凝聚物质物理学
  • 量子信息科学
  • 原子物理

背景情况:

  • 拓学和几何学是现代物理学的基础,影响了高能理论,量子信息和凝聚物质系统.
  • 带固态的几何学,编码在威尔逊线上,控制凝聚物质系统中的现象.

研究的目的:

  • 在可调节系统中实验地探测和可视化布洛赫波段的几何性质.
  • 展示一种完全表征带固态和拓不变的方法.

主要方法:

  • 在蜂巢光学晶格中使用超冷的原子气体.
  • 在威尔逊线描述的布洛赫波段内实现强力动力学.
  • 观察乐队种群的演变以推断乐队的几何形状.

主要成果:

  • 通过带种群的演变直接观察带的几何形状.
  • 成功确定带固态和贝里曲率.
  • 测量拓不变量,包括单带和多带的切尔恩和Z2数.

结论:

  • 实验技术为在凝聚物质系统中探索波段几何和拓提供了强大的工具.
  • 这项研究弥合了带状几何学理论与实验观测之间的差距.
  • 能够更深入地理解量子材料中的拓现象.