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Related Concept Videos

Development of Analytical Methods01:21

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An analytical methodology can be divided into four sequential steps: technique, method, procedure, and protocol. A technique is a scientific principle that rationalizes a specific phenomenon through chemical measurements. Adapting a technique for analyzing a sample of interest is termed a method. The procedure outlines the directions for performing the analysis via an analytical method. The protocol is the detailed guidelines on the procedure, which should be strictly followed to obtain the...
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Method validation is a crucial process in analytical chemistry designed to confirm that a given method consistently produces reliable and high-quality results. This process is essential when a method is applied to different sample matrices or when procedural modifications are made, ensuring that the results meet acceptable standards across various applications.
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The Y-to-Y Circuit01:19

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In a balanced four-wire wye-to-wye system, the arrangement involves wye-connected sinusoidal voltage sources and loads, connected through a neutral wire that links the neutral nodes of the source and load. The load impedance is connected across each phase of the load. The wye-connected source can be connected to the wye-connected load in four-wire and three-wire arrangements. A three-phase system is considered balanced when the load on each phase is equal, leading to uniform current flow and...
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Source Transformation for AC Circuits01:11

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The process of source transformation in the frequency domain entails the conversion of a voltage source, positioned in series with an impedance, into a current source that is parallel to an impedance, or the other way around. It is essential to maintain the following relationships while transitioning from one source type to another.
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Three-phase systems have two configurations: the wye and delta. A star configuration can be three or four wires; in a delta configuration, the components are connected in a closed loop. Instantaneous power refers to the power value at a precise moment, and in a balanced three-phase system, it is constant. This is because the sum of the instantaneous powers in the three phases remains steady over time, despite individual fluctuations, due to the symmetry and phase relationship. The total...
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Fault Types01:18

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When analyzing a single line-to-ground fault from phase A to ground at a three-phase bus, it is important to consider the fault impedance. This impedance is zero for a bolted fault, equal to the arc impedance for an arcing fault, and represents the total fault impedance for a transmission-line insulator flashover. To derive sequence and phase currents, fault conditions are translated from the phase domain to the sequence domain.
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Related Experiment Video

Updated: Feb 20, 2026

Phase Diagram Characterization Using Magnetic Beads as Liquid Carriers
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Phase Diagram Characterization Using Magnetic Beads as Liquid Carriers

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Establishing and validating a new source analysis method using phase.

Vc Chirumamilla, G Gonzalez-Escamilla, S Kumar

    Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
    |October 25, 2017
    PubMed
    Summary
    This summary is machine-generated.

    This study demonstrates that phase estimation from electroencephalogram (EEG) data reliably identifies deep brain sources. The method successfully located epilepsy origins in patients, aiding neurological disorder diagnosis.

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    Cortical Source Analysis of High-Density EEG Recordings in Children
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    Area of Science:

    • Neuroscience
    • Biophysics
    • Medical Imaging

    Background:

    • Electroencephalogram (EEG) non-invasively measures brain activity.
    • Accurate localization of deep brain sources is crucial for understanding brain function and neurological disorders.
    • Current source analysis methods face challenges in precisely identifying deep electrical generators.

    Purpose of the Study:

    • To evaluate the reliability of phase estimation from scalp EEG data for identifying the number of dipoles in source analyses.
    • To assess the efficacy of this method in localizing deep brain activity and its application in neurological patient data.

    Main Methods:

    • Simulated auto-regressive oscillatory signals with white and colored noise at varying signal-to-noise ratios.
    • Modeled multiple brain dipoles at different locations.
    • Estimated dipole numbers using phase difference calculations from simulated scalp EEG data.
    • Applied the developed source analysis method to real EEG data from temporal lobe epilepsy (TLE) patients.

    Main Results:

    • The analytical framework accurately identified the number and orientation of simulated dipoles.
    • The method successfully pinpointed the epileptogenic zone in TLE patients.
    • Findings in TLE patients were corroborated by post-surgical pathological studies.

    Conclusions:

    • Phase estimation from scalp EEG is a reliable technique for deep brain source localization.
    • This method offers a valuable tool for understanding neuronal function and diagnosing neurological disorders like TLE.
    • The successful application to real patient data validates its clinical potential.