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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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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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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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Frames: Problem Solving I01:24

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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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DefinitionComputed Tomography (CT) of the genitourinary (GU) tract is a non-invasive imaging modality that utilizes X-rays and computer processing to generate detailed cross-sectional images of the urinary system, encompassing the kidneys, ureters, bladder, and adjacent structures such as the adrenal glands.PurposeCT scans of the GU tract serve several diagnostic and therapeutic purposes, including:Diagnosis of Urinary Tract Diseases: Detects kidney stones, tumors, cysts, and congenital...
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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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High frame-rate computational ghost imaging system using an optical fiber phased array and a low-pixel APD array.

Chunbo Liu, Jingqiu Chen, Jiaxin Liu

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    A novel computational ghost imaging system uses an optical fiber phased array (OFPA) for faster speckle projection. This computational ghost imaging approach significantly boosts imaging frame rates compared to traditional methods.

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    Area of Science:

    • Optics
    • Computational Imaging
    • Photonics

    Background:

    • Traditional ghost imaging systems face limitations in achieving high frame rates.
    • Computational ghost imaging offers potential for faster imaging but requires efficient projection methods.

    Purpose of the Study:

    • To propose a computational ghost imaging system scheme utilizing an optical fiber phased array (OFPA).
    • To enhance the imaging frame rate of computational ghost imaging systems.

    Main Methods:

    • Implemented a computational ghost imaging system based on an optical fiber phased array (OFPA).
    • Employed high-speed electro-optic modulators for rapid, precomputed speckle projection.
    • Utilized a low-pixel avalanche photodiode (APD) array for signal reception to reduce data dimensionality and computational complexity.

    Main Results:

    • The OFPA enables significantly faster speckle projection compared to conventional techniques.
    • The low-pixel APD array reduces sampling requirements and avoids image aliasing.
    • Analysis and simulations confirm a substantial improvement in imaging frame rate.

    Conclusions:

    • The proposed OFPA-based computational ghost imaging system effectively increases imaging speed.
    • This method offers a viable solution for high-frame-rate ghost imaging applications.