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Related Concept Videos

Passive Filters01:27

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Passive filters are utilized to shape the frequency spectrum of signals across a diverse array of applications. These filters, using only passive elements like resistors (R), inductors (L), and capacitors (C), are capable of selectively allowing or blocking certain frequency ranges without the need for external power sources.
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During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA.  Marilyn Kozak discovered that the sequence RCCAUGG (where R...
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The simplest mechanical waves are associated with simple harmonic motion and repeat themselves for several cycles. These simple harmonic waves can be modeled using a combination of sine and cosine functions. Consider a simplified surface water wave that moves across the water's surface. Unlike complex ocean waves, in surface water waves, water moves vertically, oscillating up and down, whereas the disturbance of the wave moves horizontally through the medium. If a seagull is floating on the...
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Passive Millimeter Wave Imaging System Based on Helical Scanning.

Yang Meng1, Anyong Qing2,3, Chuan Lin4

  • 1University of Electronic Science and Technology of China, Chengdu, 610054, China. mengy.1003@163.com.

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|May 20, 2018
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Summary
This summary is machine-generated.

A new passive millimeter wave (PMMW) imaging system offers fast, 3-second security screening. This innovative system achieves high angular resolution and an adjustable field of view for effective concealed item detection.

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Area of Science:

  • Applied Physics
  • Imaging Technology
  • Security Systems

Background:

  • Traditional security screening methods can be time-consuming and lack advanced detection capabilities.
  • Passive millimeter wave (PMMW) imaging offers potential for non-ionizing, all-weather security screening.

Purpose of the Study:

  • To develop and evaluate a simple, fast, single-channel PMMW imaging system for public security applications.
  • To demonstrate the system's capability in detecting concealed items on the human body.

Main Methods:

  • An innovative scanning mechanism was employed in the single-channel PMMW imaging system.
  • Indoor experiments were conducted using the system to image human subjects with and without concealed items.
  • The system's angular resolution and field of view (FOV) were assessed.

Main Results:

  • The PMMW imaging system successfully completed imaging in 3 seconds.
  • An angular resolution of approximately 0.7° was achieved.
  • The system demonstrated an adjustable FOV suitable for various target sizes.

Conclusions:

  • The developed PMMW imaging system is a simple and fast solution for public security screening.
  • The innovative scanning mechanism contributes to efficient concealed item detection.
  • The system's adjustable FOV enhances its adaptability for diverse security scenarios.