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Related Concept Videos

Framing Effects03:26

Framing Effects

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Information is everywhere and its presentation—such as how and when items are presented—can impact our perceptions and decisions surrounding the info. This broad concept umbrellas framing effects—influences that occur due to the way information is framed in its appearance, whether it’s purely the order or the specific wording of a message. Let’s take a look at numerous ways in which two versions of something can objectively say the same thing, yet we respond in...
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Frames01:30

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Frames are essential components of various mechanical and structural systems used daily. These structures are known for their stability and ability to bear heavy loads. A frame is constructed using two-force and multi-force members, interconnected using pin joints. In contrast, trusses are made entirely of two-force members.
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Frames: Problem Solving I01:24

Frames: Problem Solving I

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Consider a jib crane with an external load suspended from the pulley. The dimensions of the crane members are shown in the figure. A systematic analysis of the frame structure is required to determine the reaction forces at the pin joints, assuming that the pulleys are frictionless.
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Frames: Problem Solving II01:26

Frames: Problem Solving II

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Consider a hydraulic hoist supporting a load of 1 kN. Assuming a simplified schematic representation of this frame structure, the force acting on BD and BF members can be determined.
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Inertial Frames of Reference01:03

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Newton’s first law is usually considered to be a statement about reference frames. It provides a method for identifying a special type of reference frame: the inertial reference frame. In principle, we can make the net force on a body zero. If its velocity relative to a given frame is constant, then that frame is said to be inertial. So, by definition, an inertial reference frame is a reference frame where Newton's first law holds valid. Newton's first law applies to objects with...
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Non-inertial Frames of Reference01:27

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A reference frame accelerating or decelerating relative to an inertial frame is a non-inertial frame. To help understand this, consider what taking off in an airplane, turning a corner in a car, riding a merry-go-round, and the circular motion of a tropical cyclone all have in common. All these systems are accelerating, decelerating, or rotating relative to the Earth; hence, they all are non-inertial frames. All these systems exhibit inertial forces, which merely seem to arise from motion,...
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Related Experiment Video

Updated: Jan 25, 2026

Blood Flow Imaging with Ultrafast Doppler
05:57

Blood Flow Imaging with Ultrafast Doppler

Published on: October 14, 2020

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The virtual frame technique: ultrafast imaging with any camera.

S Dillavou, S M Rubinstein, J M Kolinski

    Optics Express
    |May 5, 2019
    PubMed
    Summary
    This summary is machine-generated.

    The virtual frame technique (VFT) dramatically boosts camera frame rates, enabling detailed visualization of fast-moving events. This accessible imaging method surpasses high-speed cameras for capturing rapid physical processes.

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    Area of Science:

    • Physics
    • Materials Science
    • Imaging Technology

    Background:

    • Observing rapid natural and industrial phenomena often requires specialized, expensive cameras.
    • Existing imaging technologies face limitations in capturing high-speed events cost-effectively.

    Purpose of the Study:

    • To introduce and detail the virtual frame technique (VFT) for significantly enhancing camera frame acquisition rates.
    • To demonstrate the VFT's capability in visualizing rapid physical processes with high resolution.

    Main Methods:

    • The virtual frame technique (VFT) leverages a camera's dynamic range to increase its frame acquisition rate.
    • The technique is applied to analyze dynamics in binary state transitions during physical processes.

    Main Results:

    • The VFT demonstrated superior performance compared to commercial high-speed cameras in imaging rate and field of view.
    • Achieved a 65MHz frame rate at 4MPx resolution, exceeding conventional methods.
    • Potential for modern cell phones to reach over a million frames per second using VFT.

    Conclusions:

    • The virtual frame technique (VFT) offers a simple, accessible, and powerful solution for high-speed imaging.
    • VFT enables unprecedented visualization of rapid physical phenomena across various scientific and industrial applications.
    • This technique democratizes high-speed imaging, making it feasible with standard and mobile devices.