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Related Concept Videos

Faraday's Law01:10

Faraday's Law

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Faraday's law state that the induced emf is the negative change in the magnetic flux per unit of time. Any change in the magnetic field or change in the orientation of the area of the coil with respect to the magnetic field induces a voltage (emf). The magnetic flux measures the number of magnetic field lines through a given surface area. Magnetic flux is estimated from the integral of the dot product of the magnetic field vector and the area vector. The negative sign describes the...
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Faraday Disk Dynamo01:23

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A Faraday disk dynamo is a DC generator, producing an emf that is constant in time. It consists of a conducting disk that rotates with a constant angular velocity in the magnetic field, perpendicular to the disk's plane. The rotation of the disk causes a change in magnetic flux, which induces an emf, causing opposite charges to develop on the rim and in the center of the disk. The polarity of the induced emf can be determined by the direction of the magnetic field and the direction of the...
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Self-Locking Screw01:16

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A square-threaded screw jack is a mechanical device widely used for lifting heavy loads or applying considerable force. One of the key features that can make a screw jack more effective and reliable is its self-locking capability.
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Oral Cavity01:11

Oral Cavity

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The oral cavity, or the mouth, is a complex structure in humans that plays a vital role in our day-to-day lives. Its role is not only in chewing and swallowing food; it also plays a role in speech and facial expressions.
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Nose and Nasal Cavity01:24

Nose and Nasal Cavity

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The nose is composed of an observable exterior segment (external nose) and an internal segment within the skull known as the nasal cavity (internal nose). The external nose, visible on the face, consists of a framework of bone and hyaline cartilage enveloped in skin and muscle and lined with a mucous membrane. This structure is supported by the frontal bone, nasal bones, and maxillary bone and is supplemented by a cartilaginous framework comprising the septal nasal cartilage, lateral nasal...
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Frequency-dependent Selection

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When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.
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Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
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Frequency-locked cavity ring-down Faraday rotation spectroscopy.

Jakob Hayden, Jonas Westberg, Charles Link Patrick

    Optics Letters
    |October 16, 2018
    PubMed
    Summary
    This summary is machine-generated.

    Cavity ring-down Faraday rotation spectroscopy (CRD-FRS) offers calibration-free trace gas analysis for paramagnetic species. This advanced technique achieves a low detection limit for oxygen, enhancing measurement accuracy and efficiency.

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    Area of Science:

    • Analytical Chemistry
    • Spectroscopy
    • Environmental Science

    Background:

    • Cavity ring-down Faraday rotation spectroscopy (CRD-FRS) is a precise method for detecting paramagnetic trace gases.
    • Existing methods often require redundant off-resonance measurements to correct for system losses.

    Purpose of the Study:

    • To develop a calibration-free CRD-FRS system for trace gas concentration retrieval.
    • To enhance the duty-cycle and efficiency of CRD-FRS measurements.
    • To demonstrate the system's performance for trace oxygen detection.

    Main Methods:

    • Implemented active line-locking to a molecular transition for inherent calibration.
    • Utilized a Pound-Drever-Hall laser lock to the cavity resonance for high ring-down rates (up to 9 kHz).
    • Leveraged the differential measurement's insensitivity to nonabsorber-related losses.

    Main Results:

    • Achieved calibration-free trace gas concentration retrieval.
    • Demonstrated high effective duty-cycle due to rapid ring-down rates.
    • Established a minimum detection limit at the ppmv/√Hz level for trace oxygen.

    Conclusions:

    • The developed CRD-FRS system provides accurate, calibration-free measurements of paramagnetic species.
    • The enhanced system design significantly improves measurement efficiency and detection limits.
    • This technique is highly promising for sensitive trace gas monitoring.