Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Principal Stresses in a Beam01:11

Principal Stresses in a Beam

758
In prismatic beams subject to arbitrary transverse loading, It is essential to analyze the interaction between shear forces and bending moments in order to understand stress distribution and ensure structural integrity. The highest normal or bending stress occurs at the outer fibers of the beam, decreasing linearly to zero at the neutral axis. In contrast, shear stress peaks at the neutral axis and diminishes toward the outer surfaces.
Analyzing principal stresses is crucial, especially in...
758
Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview01:13

Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview

1.3K
Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
The ATR process begins by directing a beam...
1.3K
Diffusion01:12

Diffusion

222.0K
Diffusion is the passive movement of substances down their concentration gradients—requiring no expenditure of cellular energy. Substances, such as molecules or ions, diffuse from an area of high concentration to an area of low concentration in the cytosol or across membranes. Eventually, the concentration will even out, with the substance moving randomly but causing no net change in concentration. Such a state is called dynamic equilibrium, which is essential for maintaining overall...
222.0K
Diffusion01:21

Diffusion

6.7K
Diffusion is a type of passive transport. In passive transport, a substance tends to move from an area of high concentration to an area of low concentration until the concentration is equal across the space. For example, take the diffusion of substances through the air. When someone opens a perfume bottle in a room filled with people, the perfume is at its highest concentration in the bottle and is at its lowest at the edges of the room. The perfume vapor will diffuse, or spread away, from the...
6.7K
Principal Moments of Area01:14

Principal Moments of Area

1.7K
In mechanics, the product of inertia and moments of inertia of area help to calculate the stability and performance of various structures and components. The coordinate transformation relations are used to calculate the moments and products of inertia for an area about the inclined axes. Further, the moments and products of inertia with respect to the principal axes can be determined using the moments and products of inertia about the inclined axes.
The principal moment of inertia axes are the...
1.7K
Principal Stresses01:24

Principal Stresses

865
The graphical depiction of normal and shearing stress equations is represented by a circle, demonstrating the interplay between these stresses under different angular conditions. The center of this circle C, located on the vertical axis, represents the average normal stress, while its radius shows the range of stress variations. At points A and B, where the circle intersects the horizontal axis, the maximum and minimum normal stresses are observed, occurring without shearing stress. These...
865

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Calcium/calmodulin-dependent protein kinase II links ER stress with Fas and mitochondrial apoptosis pathways.

The Journal of clinical investigation·2009
Same author

Cripto-1 overexpression is involved in the tumorigenesis of nasopharyngeal carcinoma.

BMC cancer·2009
Same author

Range of motion and orientation of the lumbar facet joints in vivo.

Spine·2009
Same author

[Silencing of COX-2 in nasopharyngeal carcinoma cells with a shRNAmir lentivirus vector].

Nan fang yi ke da xue xue bao = Journal of Southern Medical University·2009
Same author

The risk of melamine-induced nephrolithiasis in young children starts at a lower intake level than recommended by the WHO.

Pediatric nephrology (Berlin, Germany)·2009
Same author

Adult scoliosis in patients over sixty-five years of age: outcomes of operative versus nonoperative treatment at a minimum two-year follow-up.

Spine·2009

Related Experiment Video

Updated: Feb 14, 2026

Agarose-based Tissue Mimicking Optical Phantoms for Diffuse Reflectance Spectroscopy
09:25

Agarose-based Tissue Mimicking Optical Phantoms for Diffuse Reflectance Spectroscopy

Published on: August 22, 2018

13.3K

Principal frequency component analysis based on modulate chopper technique used in diffuse reflectance spectroscopy

Shaoxiu Song, Gang Li, Xingwei Hou

    Applied Optics
    |February 23, 2018
    PubMed
    Summary

    We developed a Principal Frequency Component Analysis (PFCA) method to improve diffuse reflectance spectroscopy (DRS) measurements. This technique effectively eliminates ambient light and instrument interference, enhancing accuracy for spectral analysis.

    More Related Videos

    Diffuse Reflectance Spectroscopy: Getting the Capillary Refill Test Under One's Thumb
    06:50

    Diffuse Reflectance Spectroscopy: Getting the Capillary Refill Test Under One's Thumb

    Published on: December 2, 2017

    9.7K
    Use of Principal Components for Scaling Up Topographic Models to Map Soil Redistribution and Soil Organic Carbon
    09:44

    Use of Principal Components for Scaling Up Topographic Models to Map Soil Redistribution and Soil Organic Carbon

    Published on: October 16, 2018

    10.7K

    Related Experiment Videos

    Last Updated: Feb 14, 2026

    Agarose-based Tissue Mimicking Optical Phantoms for Diffuse Reflectance Spectroscopy
    09:25

    Agarose-based Tissue Mimicking Optical Phantoms for Diffuse Reflectance Spectroscopy

    Published on: August 22, 2018

    13.3K
    Diffuse Reflectance Spectroscopy: Getting the Capillary Refill Test Under One's Thumb
    06:50

    Diffuse Reflectance Spectroscopy: Getting the Capillary Refill Test Under One's Thumb

    Published on: December 2, 2017

    9.7K
    Use of Principal Components for Scaling Up Topographic Models to Map Soil Redistribution and Soil Organic Carbon
    09:44

    Use of Principal Components for Scaling Up Topographic Models to Map Soil Redistribution and Soil Organic Carbon

    Published on: October 16, 2018

    10.7K

    Area of Science:

    • Analytical Chemistry
    • Spectroscopy

    Background:

    • Diffuse reflectance spectroscopy (DRS) is susceptible to ambient light and instrument dark current interference.
    • Existing methods using optical choppers face limitations due to spectrometer sampling rates and energy distribution inefficiencies.

    Purpose of the Study:

    • To introduce a Principal Frequency Component Analysis (PFCA) method for DRS to overcome current limitations.
    • To enhance measurement precision and accuracy in DRS by effectively eliminating interference signals.

    Main Methods:

    • Proposed a novel Principal Frequency Component Analysis (PFCA) method based on modulate chopper technology for DRS.
    • Verified optical chopper function in eliminating ambient light interference through experiments.
    • Measured 64 mixture solutions (intralipid, India ink, rhodamine B) using DRS with PFCA, Fourier transform, and no-chopper methods.
    • Utilized partial least square regression for concentration prediction.

    Main Results:

    • The PFCA method effectively eliminated ambient light and instrument dark current interference.
    • DRS with chopper and PFCA demonstrated superior performance compared to Fourier transform and no-chopper methods.
    • PFCA improved analysis accuracy by extracting maximum useful information from spectral data.

    Conclusions:

    • The proposed PFCA method significantly enhances the accuracy and reliability of diffuse reflectance spectroscopy.
    • PFCA offers a robust solution for mitigating interference and improving spectral analysis precision.