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Related Concept Videos

Prismatic Beams: Problem Solving01:15

Prismatic Beams: Problem Solving

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In the design of a supported timber beam subjected to a distributed load, both the beam's physical dimensions and the timber's characteristics, such as its grade and species, are critical. These factors determine the allowable stress values, which are crucial for calculating the necessary beam depth to ensure structural integrity and safety.
The design begins with analyzing the beam as a free body to identify moments and force balances, thereby determining support reactions. Next, the...
179
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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Plastic Deformation in Circular Shafts01:20

Plastic Deformation in Circular Shafts

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When materials are subjected to forces that surpass their yield strength, they undergo a process known as plastic deformation. This results in a permanent alteration or strain in their structure. This concept can be specifically applied to circular shafts, where the deformation leads to a change in its shape. The precise evaluation of this plastic deformation requires understanding the stress distribution within the circular shaft, which is achieved by calculating the maximum shearing stress in...
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Angle of Twist: Problem Solving01:13

Angle of Twist: Problem Solving

351
An electric motor applies a torque of 700 N·m to an aluminum shaft, triggering a stable rotation. Two pulleys, B and C, are subjected to torques of 300 N·m and 400 N·m, respectively. The modulus of rigidity is provided as 25 GPa. With the knowledge of the length and diameter of each segment, the twist angle between the two pulleys can be computed. First, a section cut is made between pulleys B and C, and the cut cross-section is analyzed using a free-body diagram. Given that the...
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Deflection of a Beam01:19

Deflection of a Beam

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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.
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Potential Due to a Polarized Object01:29

Potential Due to a Polarized Object

439
A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
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Related Experiment Video

Updated: Jul 25, 2025

Scanning SQUID Study of Vortex Manipulation by Local Contact
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Particle manipulation with twisted circle Pearcey vortex beams.

Yongzheng Yang, You Wu, Xinqing Zheng

    Optics Letters
    |June 30, 2023
    PubMed
    Summary

    Researchers developed a new particle manipulation method using twisted circle Pearcey vortex beams. This technique enables precise control for efficient particle cleaning and trapping, offering a novel platform for scientific study.

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    Area of Science:

    • Optics and Photonics
    • Particle Physics
    • Microfluidics

    Background:

    • Traditional particle manipulation methods face limitations in speed and precision.
    • Controlling particle behavior in microscale environments is crucial for various scientific applications.

    Purpose of the Study:

    • To introduce a novel particle manipulation technique using twisted circle Pearcey vortex beams.
    • To demonstrate flexible control over particle rotation and trapping.
    • To enable rapid de-gathering and re-gathering of particles for efficient cleaning.

    Main Methods:

    • Utilizing twisted circle Pearcey vortex beams modulated by a noncanonical spiral phase.
    • Implementing a protective barrier for stable particle trapping.
    • Demonstrating the system's capability for dynamic particle manipulation.

    Main Results:

    • Achieved flexible adjustment of particle rotation characteristics and spiral patterns.
    • Successfully trapped particles with a protective barrier, preventing perturbation.
    • Demonstrated rapid de-gathering and re-gathering of multiple particles for effective cleaning.

    Conclusions:

    • The proposed method offers a new approach to particle manipulation and cleaning.
    • The system provides a versatile platform for controlling particle dynamics.
    • This innovation has potential applications in microscale cleaning and further scientific research.