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

Angular Momentum about an Arbitrary Axis01:11

Angular Momentum about an Arbitrary Axis

388
Imagine a rigid body with a mass denoted as 'm', which has its center of mass at point G and is rotating around an inertial reference frame. The angular momentum at an arbitrary point P can be calculated by taking the cross product of the position vector and linear momentum vector for each individual mass element.
The velocity of a mass element comprises its translational velocity and the relative velocity instigated by the body's rotation. Substituting the velocity equation into...
388
Conservation of Angular Momentum: Application01:18

Conservation of Angular Momentum: Application

12.0K
A system's total angular momentum remains constant if the net external torque acting on the system is zero. Examples of such systems include a freely spinning bicycle tire that slows over time due to torque arising from friction, or the slowing of Earth's rotation over millions of years due to frictional forces exerted on tidal deformations. However in the absence of a net external torque, the angular momentum remains conserved. The conservation of angular momentum principle requires a...
12.0K
Conservation of Angular Momentum01:09

Conservation of Angular Momentum

15.6K
A system's total angular momentum remains constant if the net external torque acting on the system is zero. Considering a system that consists of n tiny particles, the angular momentum of any tiny particle may change, but the system's total angular momentum would remain constant. The principle of conservation of angular momentum only considers the net external torque acting on the system. While there are internal forces exerted by different particles within the system that also produce...
15.6K
Angular Momentum and Principle Axes of Inertia01:09

Angular Momentum and Principle Axes of Inertia

428
The concept of angular momentum for a solid structure is illustrated as the cumulative result of the cross-product of the position vector of the mass element and the cross-product of the body's angular velocity with the position vector.
To put this equation into simpler terms, it can be reconfigured using rectangular coordinates. This involves choosing an alternative set of XYZ axes that are arbitrarily inclined with respect to the reference frame. The process of deriving the rectangular...
428
Angular Momentum01:21

Angular Momentum

640
Angular momentum characterizes an object's rotational motion and is defined as the moment of its linear momentum about a specified point O. When a particle moves along a curved path in the x-y plane, the scalar formulation calculates the magnitude of its angular momentum, utilizing the moment arm (d), representing the perpendicular distance from point O to the line of action of the linear momentum. Despite being scalar in formulation, angular momentum is inherently a vector quantity. Its...
640
Angular Momentum: Single Particle01:10

Angular Momentum: Single Particle

7.4K
Angular momentum is directed perpendicular to the plane of the rotation, and its magnitude depends on the choice of the origin. The perpendicular vector joining the linear momentum vector of an object to the origin is called the “lever arm.” If the lever arm and linear momentum are collinear, then the magnitude of the angular momentum is zero. Therefore, in this case, the object rotates about the origin such that it lies on the rim of the circumference defined by the lever arm...
7.4K

You might also read

Related Articles

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

Sort by
Same author

The second extracellular domain of connexin 50 is important for in cell adhesion, lens differentiation, and adhesion molecule expression.

The Journal of biological chemistry·2023
Same author

Sertoli cells-derived exosomal miR-30a-5p regulates ubiquitin E3 ligase Zeb2 to affect the spermatogonial stem cells proliferation and differentiation.

Reproductive toxicology (Elmsford, N.Y.)·2023
Same author

Polymorphisms in TRIB2 and CAPRIN2 Genes Contribute to the Susceptibility to High Myopia-Induced Cataract in Han Chinese Population.

Medical science monitor : international medical journal of experimental and clinical research·2023
Same author

CoP@Ni core-shell heterostructure nanowire array: A highly efficient electrocatalyst for hydrogen evolution.

Journal of colloid and interface science·2023
Same author

Duck gasdermin E is a substrate of caspase-3/-7 and an executioner of pyroptosis.

Frontiers in immunology·2023
Same author

Vitamin B12 Ameliorates the Pathological Phenotypes of Multiple Parkinson's Disease Models by Alleviating Oxidative Stress.

Antioxidants (Basel, Switzerland)·2023

Related Experiment Video

Updated: Dec 23, 2025

Automated Deployment of an Internet Protocol Telephony Service on Unmanned Aerial Vehicles Using Network Functions Virtualization
07:49

Automated Deployment of an Internet Protocol Telephony Service on Unmanned Aerial Vehicles Using Network Functions Virtualization

Published on: November 26, 2019

8.4K

Orbit Angular Momentum MIMO with Mode Selection for UAV-Assisted A2G Networks.

Tao Hu1, Yang Wang1, Bo Ma2

  • 1School of Communication and Information Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, China.

Sensors (Basel, Switzerland)
|April 23, 2020
PubMed
Summary

Unmanned aerial vehicle (UAV) networks enhance wireless communications using orbit angular momentum (OAM) vortex beams. A new branch and bound search-based mode selection (BBS-MS) scheme optimizes spectrum efficiency in air-to-ground (A2G) channels.

Keywords:
air-to-ground (A2G)branch and bound search-based mode selection (BBS-MS)line-of-sight (LOS)orbit angular momentum (OAM)spectrum efficiency (SE)unmanned aerial vehicle (UAV)

More Related Videos

Time Multiplexing Super Resolving Technique for Imaging from a Moving Platform
06:25

Time Multiplexing Super Resolving Technique for Imaging from a Moving Platform

Published on: February 12, 2014

8.7K
Author Spotlight: UAV Remote Sensing for Efficient Invasive Plant Biomass Estimation
08:47

Author Spotlight: UAV Remote Sensing for Efficient Invasive Plant Biomass Estimation

Published on: February 9, 2024

2.0K

Related Experiment Videos

Last Updated: Dec 23, 2025

Automated Deployment of an Internet Protocol Telephony Service on Unmanned Aerial Vehicles Using Network Functions Virtualization
07:49

Automated Deployment of an Internet Protocol Telephony Service on Unmanned Aerial Vehicles Using Network Functions Virtualization

Published on: November 26, 2019

8.4K
Time Multiplexing Super Resolving Technique for Imaging from a Moving Platform
06:25

Time Multiplexing Super Resolving Technique for Imaging from a Moving Platform

Published on: February 12, 2014

8.7K
Author Spotlight: UAV Remote Sensing for Efficient Invasive Plant Biomass Estimation
08:47

Author Spotlight: UAV Remote Sensing for Efficient Invasive Plant Biomass Estimation

Published on: February 9, 2024

2.0K

Area of Science:

  • Wireless Communications
  • Optical Physics
  • Network Engineering

Background:

  • Unmanned aerial vehicles (UAVs) offer flexible wireless communication solutions, supplementing or replacing terrestrial base stations.
  • Conventional multiple-input-multiple-output (MIMO) systems face limitations in high-speed communications due to channel crosstalk and spectrum scarcity.
  • Orbit angular momentum (OAM) wireless networks enable multiple physical channels within the same frequency band, providing new degrees of freedom.

Purpose of the Study:

  • Investigate UAV-based air-to-ground (A2G) radio vortex wireless networks and their channel models.
  • Propose a novel scheme to optimize spectrum efficiency (SE) in these networks.
  • Enhance communication performance and reduce complexity compared to existing systems.

Main Methods:

  • Developed a branch and bound search-based mode selection (BBS-MS) scheme.
  • Utilized the spatial distribution characteristics of vortex beams for optimization.
  • Conducted theoretical derivations and numerical simulations to validate the scheme.

Main Results:

  • The proposed BBS-MS scheme achieves optimal performance in UAV-based A2G radio vortex wireless networks.
  • Demonstrated superior spectrum efficiency compared to conventional OAM-based MIMO systems.
  • Showcased lower computational complexity than exhaustive search methods.

Conclusions:

  • The BBS-MS scheme effectively optimizes spectrum efficiency in UAV-based A2G radio vortex networks.
  • This approach offers a significant performance improvement over existing OAM-based MIMO systems.
  • The proposed method presents a computationally efficient solution for dynamic network deployments.