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相关概念视频

Beams with Symmetric Loadings01:15

Beams with Symmetric Loadings

469
The moment-area method is an analytical tool used in structural engineering to determine the slope and deflection of beams under various loads. Consider a cantilever with a concentrated load and moment at the free end. The first step is constructing a free-body diagram to calculate the reactions at the fixed end. Next, the bending moment diagram is plotted to visualize how the bending moment varies along the beam's length, focusing on points where the bending moment equals zero.
The M/EI...
469
Deflection of a Beam01:19

Deflection of a Beam

854
Accurately determining beam deflection and slope under various loading conditions in structural engineering is crucial for ensuring safety and structural integrity. Singularity functions offer a streamlined approach to analyzing beams, especially when multiple loading functions complicate the bending moment equation.
Singularity functions, described in an earlier lesson, are powerful mathematical tools that represent discontinuities within a function commonly encountered in structural loading...
854
Beams with Unsymmetric Loadings01:17

Beams with Unsymmetric Loadings

473
Analyzing a supported beam under unsymmetrical loadings is essential in structural engineering to understand how beams respond to varied force distributions. This analysis involves calculating the deflection and identifying points where the slope of the beam is zero, which are crucial for ensuring structural stability and functionality.
The first moment-area theorem determines the slope at any point on the beam. This theorem indicates that the change in slope between two points on a beam...
473
Angular Momentum about an Arbitrary Axis01:11

Angular Momentum about an Arbitrary Axis

497
Imagine a rigid body with a mass denoted as 'm', which has its center of mass at point G and is rotating around an inertial reference frame. The angular momentum at an arbitrary point P can be calculated by taking the cross product of the position vector and linear momentum vector for each individual mass element.
The velocity of a mass element comprises its translational velocity and the relative velocity instigated by the body's rotation. Substituting the velocity equation into...
497
Shear on the Horizontal Face of a Beam Element01:16

Shear on the Horizontal Face of a Beam Element

587
To understand shear on the flat side of a prismatic beam element, consider the vertical and horizontal shearing forces, and the normal forces, acting on the element. The element's upper (U) and lower (L) sections, which are divided by the beam's neutral axis, are examined. The equilibrium of these forces is determined by applying the equilibrium equation, which helps identify the horizontal shearing force. This force is directly related to the bending moments and the cross-section's...
587
Eccentric Axial Loading in a Plane of Symmetry01:16

Eccentric Axial Loading in a Plane of Symmetry

673
Eccentric axial loading occurs when an axial load is applied away from the centroidal axis of a structural member. This scenario is common in engineering, where structural elements may not be directly aligned due to various design or functional requirements.
673

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相关实验视频

Updated: Mar 15, 2026

Author Spotlight: Introduction to Active Probe Atomic Force Microscopy with Quattro-Parallel Cantilever Arrays
05:04

Author Spotlight: Introduction to Active Probe Atomic Force Microscopy with Quattro-Parallel Cantilever Arrays

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通过角光谱工程的多个自由度的辐射自加速束.

Wenyi Ji, Wenxiang Yan, Yiyu Zhao

    Optics letters
    |March 13, 2026
    PubMed
    概括

    研究人员开发了一种新方法来控制多个自由度的辐射自加速束 (RSAB). 这允许对它们的旋转,强度,轨迹和轨道角动量 (OAM) 进行可编程控制,用于先进的光学应用.

    科学领域:

    • 光学和光子学 在光学和光子学.
    • 束传播动力学 束传播动力学
    • 轻物质相互作用 轻物质相互作用

    背景情况:

    • 辐射自加速束 (RSAB) 具有独特的旋转传播和轨道角动量 (OAM) 特性.
    • 应用包括光学微操作和计量学.
    • 传统的RSAB具有固定的传播,限制了它们在复杂场景中的使用.

    研究的目的:

    • 提出并展示一个灵活的框架来设计和控制多个自由度的RSAB (Multi-DoF RSAB).
    • 为了实现对关键光束特征的可编程控制.

    主要方法:

    • 基于富里埃光学的角度光谱工程方法.
    • 多DoF RSAB的设计和实验验证.

    主要成果:

    • 证明了四个自由度的独立调整:角度速度,纵向强度,3D轨迹和OAM.
    • 实验结果与理论预测一致.

    结论:

    • 拟议的方法为设计先进的RSAB提供了一个灵活的框架.
    • 突出了光学操纵和微型制造中的应用潜力.

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    The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
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