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相关概念视频

Lattice Centering and Coordination Number02:33

Lattice Centering and Coordination Number

9.7K
The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
Types of Unit Cells
Imagine taking a large number of identical...
9.7K
Trends in Lattice Energy: Ion Size and Charge02:54

Trends in Lattice Energy: Ion Size and Charge

24.0K
An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
24.0K
Bewley Lattice Diagram01:12

Bewley Lattice Diagram

771
The Bewley lattice diagram, developed by L. V. Bewley, effectively organizes the reflections occurring during transmission-line transients. It visually represents how voltage waves propagate and reflect within a transmission line, making it easier to understand the complex interactions that occur.
771
Structures of Solids02:22

Structures of Solids

14.3K
Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
14.3K
Long-term Potentiation01:25

Long-term Potentiation

2.8K
Long-term potentiation, or LTP, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTP is the process of synaptic strengthening that occurs over time between pre and postsynaptic neuronal connections. The synaptic strengthening of LTP works in opposition to the synaptic weakening of long-term depression (LTD) and together are the main mechanisms that underlie learning and memory.
Hebbian LTP
LTP can occur when...
2.8K
Metallic Solids02:37

Metallic Solids

18.5K
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
18.5K

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相关实验视频

Updated: Jul 25, 2025

Stable DNA Motifs, 1D and 2D Nanostructures Constructed from Small Circular DNA Molecules
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Stable DNA Motifs, 1D and 2D Nanostructures Constructed from Small Circular DNA Molecules

Published on: April 12, 2019

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在LATTICE治疗中优化格子位置.

Weijie Zhang1, Yuting Lin1, Fen Wang1

  • 1Department of Radiation Oncology, University of Kansas Medical Center, Lawrence, Kansas, USA.

Medical physics
|June 26, 2023
PubMed
概括
此摘要是机器生成的。

这项研究引入了一种新的LATTICE辐射疗法规划方法,该方法优化了格子顶点位置. 这种方法改善了瘤剂量覆盖率,并节省了处于危险的器官 (OAR),以获得更好的患者结果.

关键词:
这就是IMPT.在IMRT中,IMRT是IMRT.在LATTICE/GRID辐射疗法中.峰值到谷地剂量比 (PVDR)空间分数放射疗法 (SFRT) 是一种空间分数放射疗法.

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Visualizing Surface T-Cell Receptor Dynamics Four-Dimensionally Using Lattice Light-Sheet Microscopy
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Visualizing Surface T-Cell Receptor Dynamics Four-Dimensionally Using Lattice Light-Sheet Microscopy

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相关实验视频

Last Updated: Jul 25, 2025

Stable DNA Motifs, 1D and 2D Nanostructures Constructed from Small Circular DNA Molecules
09:32

Stable DNA Motifs, 1D and 2D Nanostructures Constructed from Small Circular DNA Molecules

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Indirect Fabrication of Lattice Metals with Thin Sections Using Centrifugal Casting
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Indirect Fabrication of Lattice Metals with Thin Sections Using Centrifugal Casting

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Visualizing Surface T-Cell Receptor Dynamics Four-Dimensionally Using Lattice Light-Sheet Microscopy
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Visualizing Surface T-Cell Receptor Dynamics Four-Dimensionally Using Lattice Light-Sheet Microscopy

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科学领域:

  • 辐射瘤学 辐射瘤学
  • 医学物理 医学物理
  • 计算生物学 计算生物学

背景情况:

  • 拉蒂斯 (LATTICE) 辐射疗法提供异质剂量,具有高峰值-谷值剂量比率 (PVDR) 对瘤.
  • 目前的LATTICE规划固定了顶点位置,限制了PVDR和危险器官 (OAR) 节省的优化.

研究的目的:

  • 开发和验证一种新的LATTICE处理规划方法,优化格子顶点位置.
  • 这是首次在LATTICE辐射治疗规划中优化格子位置的研究.

主要方法:

  • 这种新的方法共同优化了格子顶点位置和平面变量 (例如,光子流动,质子点重量).
  • 格子顶点是使用sigmoid函数进行近似的,以求可微分性,并受制于几何可行性.
  • 代凸放松 (ICR) 和ADMM解决了优化问题,通过准牛顿方法进行联合更新.

主要成果:

  • 新的LATTICE方法成功地确定了最佳的格子顶点位置,并与详尽的搜索地面真相进行了验证.
  • 与标准方法相比,在降低优化目标,增加目标PVDR和增强OAR节省方面取得了优异的结果.
  • 对于光子和质子LATTICE辐射疗法的有效性已被证明.

结论:

  • 提出并验证了一种新的LATTICE治疗规划方法,优化顶点位置.
  • 这种方法通过优化网格位置和计划变量来增强目标PVDR和OAR节省.
  • 代表了LATTICE辐射疗法规划的重大进展,以提高临床疗效.