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相关概念视频

Polar and Cylindrical Coordinates01:22

Polar and Cylindrical Coordinates

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The Cartesian coordinate system is a very convenient tool to use when describing the displacements and velocities of objects and the forces acting on them. However, it becomes cumbersome when we need to describe the rotation of objects. So, when describing rotation, the polar coordinate system is generally used.
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Equations of Motion: Rectangular Coordinates and Cylindrical Coordinates01:21

Equations of Motion: Rectangular Coordinates and Cylindrical Coordinates

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Understanding the motion of particles is a fundamental aspect of classical mechanics, and the choice of the coordinate system plays a pivotal role in unraveling the complexities of their dynamics.
When a particle moves relative to an inertial frame, the equations of motion can be expressed using rectangular components. If the motion is confined to the x-y plane, the equations having the x and y coordinates only can be used to simplify the mathematical representation.
However, when particles...
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Deformation in a Circular Shaft01:10

Deformation in a Circular Shaft

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One of the distinctive characteristics of circular shafts is their ability to maintain their cross-sectional integrity under torsion. In other words, each cross-section continues to exist as a flat, unaltered entity, simply rotating like a solid, rigid slab. To understand the distribution of shearing stress within such a shaft, consider a cylindrical section inside this circular shaft. This section has a length of L and a radius of R, with one end fixed. The radius of the cylindrical section is...
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Centroid for the Paraboloid of Revolution01:16

Centroid for the Paraboloid of Revolution

646
The paraboloid of revolution is an axially symmetric surface generated by rotating a parabola around its axis. This shape has several applications in mechanical engineering due to its advantageous structural properties, such as strength against stress concentration points and rotational symmetry.
The centroid for the paraboloid of revolution is the point where all the mass of the paraboloid is concentrated. This centroid is important for engineering applications, as it determines how forces are...
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Curvilinear Motion: Polar Coordinates01:27

Curvilinear Motion: Polar Coordinates

482
In polar coordinates, the motion of a particle follows a curvilinear path. The radial coordinate symbolized as 'r,' extends outward from a fixed origin to the particle, while the angular coordinate, 'θ,' measured in radians, represents the counterclockwise angle between a fixed reference line and the radial line connecting the origin to the particle.
The particle's location is described using a unit vector along the radial direction. Deriving the particle's position...
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Gauss's Law: Cylindrical Symmetry01:20

Gauss's Law: Cylindrical Symmetry

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A charge distribution has cylindrical symmetry if the charge density depends only upon the distance from the axis of the cylinder and does not vary along the axis or with the direction about the axis. In other words, if a system varies if it is rotated around the axis or shifted along the axis, it does not have cylindrical symmetry. In real systems, we do not have infinite cylinders; however, if the cylindrical object is considerably longer than the radius from it that we are interested in,...
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Structure of HIV-1 Capsid Assemblies by Cryo-electron Microscopy and Iterative Helical Real-space Reconstruction
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精确的螺旋式参数估计基于圆柱式解滚.

Mingtao Huang1, Jinying Ma2, Xiaoyu Fu2

  • 1Key Laboratory for Protein Sciences of Ministry of Education, School of Life Sciences, Tsinghua University, Beijing 100084, China; Tsinghua-Peking Joint Center for Life Sciences, Beijing 100084, China; Beijing Frontier Research Center for Biological Structure, Beijing 100084, China; State Key Laboratory of Membrane Biology, School of Life Sciences, Tsinghua University, Beijing 100084, China; School of Life Sciences, Tsinghua University, Beijing 100084, China; Department of Electronic Engineering, Tsinghua University, Beijing 100084, China; Beijing National Research Center for Information Science and Technology, Tsinghua University, Beijing 100084, China.

Structure (London, England : 1993)
|July 18, 2025
PubMed
概括
此摘要是机器生成的。

一种新方法,HELIS,准确地估计了宏分子组件的螺旋参数. 该工具简化了通过冷电子断层扫描可视化的柔性和异质螺旋结构的结构确定.

关键词:
冷电子断层扫描 (Cryo-electron tomography) 是一种电子断层扫描技术.螺旋式参数 螺旋式参数螺旋结构的螺旋结构.参数估计的参数估计.

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科学领域:

  • 结构生物学是结构生物学.
  • 生物物理学的生物物理.
  • 生物化学 生物化学

背景情况:

  • 螺旋结构对于诸如脚手架和信号传输等细胞功能至关重要.
  • 精确估计螺旋参数对于确定这些组件的结构至关重要.
  • 现有的基于层线的方法面临着灵活和异质螺旋结构的挑战.

研究的目的:

  • 引入一种新的方法,HELIS (螺旋是简单的),用于精确的螺旋参数估计.
  • 为实际应用提供实施HELIS方法的软件包.
  • 提供一个全面的工具来分析由冷电子断层扫描可视化的螺旋组件.

主要方法:

  • 赫利斯采用圆柱形解卷方法,将螺旋结构视为制的二维晶体.
  • 它从简化的二维反向格子测量得出螺旋式参数估计.
  • 包括辅助算法,用于追踪曲线丝,确定极性,以及在现场螺旋重建.

主要成果:

  • 在估计螺旋式参数方面,HELIS表现出高精度.
  • 该方法适用于各种螺旋组件,包括具有灵活性和异质性的螺旋组件.
  • 软件包HELIS可方便对螺旋结构进行全面的确定.

结论:

  • HELIS为螺旋式参数估计提供了强大而准确的解决方案.
  • 这种方法克服了传统方法的局限性,特别是对于具有挑战性的生物样本.
  • 赫利斯 (HELIS) 是一个有价值的工具,可以促进宏分子组件的结构分析.