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

Hypothalamic-Pituitary Axis01:37

Hypothalamic-Pituitary Axis

66.7K
The response to stress—be it physical or psychological, acute or chronic—involves activation of the Hypothalamic-Pituitary-Adrenal (HPA) axis. The HPA axis is part of the neuroendocrine system because it involves both neuronal and hormonal communication. Its function is to regulate homeostatic systems—metabolic, cardiovascular, and immune—providing the necessary means to respond to a stressor.
66.7K
Perpendicular-Axis Theorem01:16

Perpendicular-Axis Theorem

4.6K
The perpendicular-axis theorem states that the moment of inertia of a planar object about an axis perpendicular to its plane is equal to the sum of the moments of inertia about two mutually perpendicular concurrent axes lying in the plane of the body.
Consider a circular disc of mass M and radius R lying along an x-y plane. The origin lies at the center of the disc, and the z-axis is perpendicular to the disc's plane. All three axes coincide at the disc's center. The moment of inertia of this...
4.6K
Parallel-axis Theorem01:06

Parallel-axis Theorem

8.3K
The parallel-axis theorem provides a convenient and quick method of finding the moment of inertia of an object about an axis parallel to the axis passing through its center of mass. Consider a thin rod as an example. There is a striking similarity between the process of finding the moment of inertia of a thin rod about an axis through its middle, where the center of mass lies, and about an axis through its end using the conventional method. In the conventional method, the concept of linear mass...
8.3K
Load along a Single Axis01:29

Load along a Single Axis

650
In structural engineering, the analysis of beams subjected to varying loads is a critical aspect of understanding the behavior and performance of these structural elements. A common scenario involves a beam subjected to a combination of different load distributions.
Consider a beam of length L subjected to a varying load, which is a combination of parabolic and trapezoidal load distribution along the x-axis. In this case, it is essential to determine the resultant loads, their locations, and...
650
Parallel-Axis Theorem for an Area01:12

Parallel-Axis Theorem for an Area

3.1K
The moment of inertia is a fundamental concept in mechanical engineering that plays a significant role in designing rotationally symmetric objects such as flywheels, gears, and other mechanical systems. In this context, we will discuss the moment of inertia of a flywheel rotating about its centroidal axis and how it relates to the moment of inertia about an axis parallel to it.
For a flywheel approximated as a solid disc, consider an infinitesimal differential element with an arbitrary distance...
3.1K
Moment of a Force About an Axis: Scalar01:28

Moment of a Force About an Axis: Scalar

719
The moment of a force about an axis is a crucial concept in mechanics that helps determine an object's rotational motion around a specific point or axis. The moment of force can be calculated using scalar analysis, which involves considering the perpendicular distance between the axis of rotation and the line of action of the force or simply the moment arm.
To better understand the concept of moment of force, consider the example of a cyclist riding a bicycle. When the cyclist applies force on...
719

You might also read

Related Articles

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

Sort by
Same author

Coronagraph-based wavefront sensors for the high Strehl regime.

Optics express·2025
Same author

Pupil segmentation in the light-field camera and its relation to 3D object positions and the reconstructed depth of field.

Applied optics·2019
Same author

Meningitis, Associated with Local Paralysis and Gastric Ulcer.

The Indian medical gazette·2017
Same author

Discovery and spectroscopy of the young jovian planet 51 Eri b with the Gemini Planet Imager.

Science (New York, N.Y.)·2015
Same author

Demonstration of coherent imaging through a phased array of single-mode optical fibers.

Optics letters·2013
Same author

Characterization of a submillimeter high-angular-resolution camera with a monolithic silicon bolometer array for the Caltech Submillimeter Observatory.

Applied optics·2010

Related Experiment Video

Updated: Feb 15, 2026

Construction of a High Resolution Microscope with Conventional and Holographic Optical Trapping Capabilities
09:12

Construction of a High Resolution Microscope with Conventional and Holographic Optical Trapping Capabilities

Published on: April 22, 2013

12.6K

Resolution optimization of an off-axis lensless digital holographic microscope.

E Serabyn, K Liewer, J K Wallace

    Applied Optics
    |January 13, 2018
    PubMed
    Summary
    This summary is machine-generated.

    This study optimizes compact lensless digital holographic microscopes (DHM) for extreme environments. Researchers achieved sub-micrometer resolution, paving the way for detecting cellular life on ocean moons.

    More Related Videos

    Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization
    10:28

    Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization

    Published on: July 5, 2016

    10.7K
    Quantifying Microorganisms at Low Concentrations Using Digital Holographic Microscopy DHM
    07:27

    Quantifying Microorganisms at Low Concentrations Using Digital Holographic Microscopy DHM

    Published on: November 1, 2017

    10.9K

    Related Experiment Videos

    Last Updated: Feb 15, 2026

    Construction of a High Resolution Microscope with Conventional and Holographic Optical Trapping Capabilities
    09:12

    Construction of a High Resolution Microscope with Conventional and Holographic Optical Trapping Capabilities

    Published on: April 22, 2013

    12.6K
    Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization
    10:28

    Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization

    Published on: July 5, 2016

    10.7K
    Quantifying Microorganisms at Low Concentrations Using Digital Holographic Microscopy DHM
    07:27

    Quantifying Microorganisms at Low Concentrations Using Digital Holographic Microscopy DHM

    Published on: November 1, 2017

    10.9K

    Area of Science:

    • Astrobiology
    • Microscopy
    • Optical Engineering

    Background:

    • Detecting extraterrestrial cellular life requires high-resolution, compact, and robust microscopes.
    • Space exploration missions to ocean moons necessitate advanced imaging capabilities.

    Purpose of the Study:

    • To optimize the resolution of a compact off-axis lensless digital holographic microscope (DHM).
    • To identify optimal configurations for high-resolution imaging in extreme environments.

    Main Methods:

    • Analysis of resolution regimes in lensless DHM configurations.
    • Experimental validation using a 2kx2k pixel array DHM in a high-magnification regime.
    • Application of standard aberration correction software.

    Main Results:

    • Identified two optimal high-resolution regimes: low-magnification (sample near detector) and high-magnification (sample near source).
    • Achieved a spatial resolution of ~0.95 µm, significantly smaller than the pixel size (5.5 µm).
    • Demonstrated that resolution improves with detector array size in the high-magnification regime.

    Conclusions:

    • Lensless DHM can achieve near wavelength-scale resolution with larger detector arrays.
    • The optimized DHM design is suitable for detecting cellular life in extraterrestrial extreme environments.
    • Sub-micrometer resolution is achievable with compact, lensless holographic microscopy.