Related Experiment Video
Updated: Aug 12, 2025
08:47
Automated Analysis of C. elegans Swim Behavior Using CeleST Software
Published on: December 7, 2016
12.8K
Different effects of external force fields on aging Lévy walk.
1College of Sciences, Nanjing Agricultural University, Nanjing 210095, People's Republic of China.
Chaos (Woodbury, N.Y.)
|February 1, 2023
Summary
A constant force field enhances aging Lévy walk diffusion, unlike a periodic force. This study explores how external forces impact aging phenomena in physical systems.
Area of Science:
- Physics
- Statistical Mechanics
- Complex Systems
Background:
- Aging phenomena are prevalent in various physical systems.
- Statistical quantities in aging anomalous diffusion depend on aging time (ta).
Purpose of the Study:
- To investigate the effect of external force fields on aging Lévy walks.
- To compare the influence of constant and time-dependent periodic forces.
Main Methods:
- Utilizing the Langevin picture of Lévy walks.
- Applying the generalized Green-Kubo formula.
- Analyzing ensemble- and time-averaged mean-squared displacements in weak (ta≪t) and strong (ta≫t) aging regimes.
Main Results:
- A constant force field is identified as crucial for inducing and enhancing aging phenomena in Lévy walks.
- Time-dependent periodic forces do not exhibit the same enhancing effect on aging Lévy walks.
- Theoretical analyses and numerical simulations confirm these distinct effects.
Conclusions:
- External force fields significantly modulate aging Lévy walk dynamics.
- Constant forces promote diffusion, while periodic forces do not, highlighting the importance of force characteristics.
More Related Videos
Related Concept Videos
01:19The Effect of Aging on Tissues
2.2K
Several body functions deteriorate with age. The external signs of aging are easily identifiable. For example, the skin becomes dry, less elastic, and thins out, forming wrinkles. The skin of the face begins to appear looser due to a decrease in the levels of elastic and collagen fibers in the connective tissue. Additionally, melanin production in the hair follicle decreases with age, resulting in gray hair. Moreover, the senses of sight and hearing decline, so glasses and hearing aids may...
2.2K
01:26Aging
133
Aging is a complex biological phenomenon influenced by various processes that affect cellular and systemic functions. Several prominent theories attempt to explain its mechanisms, highlighting cellular limitations, oxidative damage, and hormonal changes as central factors in aging.
Cellular Clock Theory
The cellular clock theory posits that the human lifespan is closely tied to the finite capacity of cells to divide, a phenomenon governed by telomeres, which are protective caps at the ends of...
Cellular Clock Theory
The cellular clock theory posits that the human lifespan is closely tied to the finite capacity of cells to divide, a phenomenon governed by telomeres, which are protective caps at the ends of...
133
01:17Non-conservative Forces
8.0K
Non-conservative forces are dissipative forces such as friction or air resistance. These forces take energy away from a system as it progresses. Unlike conservative forces, non-conservative forces do not have potential energy associated with them. This is because the energy is lost to the system and cannot be turned into useful work later.
Also unlike their conservative counterparts, they are path-dependent; where the object starts and stops does matter. For example, a grinding wheel applies a...
Also unlike their conservative counterparts, they are path-dependent; where the object starts and stops does matter. For example, a grinding wheel applies a...
8.0K
01:05Static and Kinetic Frictional Force
16.0K
One of the simpler characteristics of sliding friction is that it is parallel to the contact surfaces between systems, and is always in a direction that opposes the motion or attempted motion of the systems relative to each other. If two systems are in contact and moving relative to one another, then the friction between them is called kinetic friction. For example, kinetic friction slows a hockey puck sliding on ice.
However, if two systems are in contact and are stationary relative to one...
However, if two systems are in contact and are stationary relative to one...
16.0K
01:20Two-Dimensional Force System
970
A two-dimensional system in mechanical engineering involves the analysis of motion and forces in a plane. A two-dimensional force vector can be resolved into its components as:
970
01:12Internal and External Forces
13.3K
Newton's first law states that a net external force causes a change in motion. External forces act on an object or system, originating outside of the object or system. In contrast, internal forces originate inside the system of interest and do not lead to any acceleration. In simpler words, internal forces are forces that act on one part of an object and are exerted by another part of the same object. External forces are forces that act on an object due to some other object. Therefore, when...
13.3K