Current reversals of active particles in time-oscillating potentials

Soft Matter ◽  
2018 ◽  
Vol 14 (38) ◽  
pp. 7850-7858 ◽  
Author(s):  
Jing-jing Liao ◽  
Xiao-qun Huang ◽  
Bao-quan Ai
Keyword(s):  
Two Dimensional ◽  
Active Particles ◽  
Oscillating Potential

Rectification of interacting active particles is numerically investigated in a two-dimensional time-oscillating potential.

scholarly journals Universality class of the motility-induced critical point in large scale off-lattice simulations of active particles.

Soft Matter ◽  
2021 ◽  
Author(s):  
Claudio Maggi ◽  
Matteo Paoluzzi ◽  
Andrea Crisanti ◽  
Emanuela Zaccarelli ◽  
Nicoletta Gnan
Keyword(s):  
Phase Separation ◽  
Critical Point ◽  
Computer Simulations ◽  
Large Scale ◽  
Universality Class ◽  
Critical Behaviour ◽  
Two Dimensional ◽  
Dimensional Model ◽  
Active Particles ◽  
Two Dimensional Model

We perform large-scale computer simulations of an off-lattice two-dimensional model of active particles undergoing a motility-induced phase separation (MIPS) to investigate the systems critical behaviour close to the critical point...

scholarly journals Mixing and demixing of binary mixtures of polar chiral active particles

Soft Matter ◽  
2018 ◽  
Vol 14 (21) ◽  
pp. 4388-4395 ◽  
Author(s):  
Bao-quan Ai ◽  
Zhi-gang Shao ◽  
Wei-rong Zhong
Keyword(s):  
Binary Mixture ◽  
Boundary Conditions ◽  
Binary Mixtures ◽  
Periodic Boundary ◽  
Periodic Boundary Conditions ◽  
Two Dimensional ◽  
Active Particles

We study a binary mixture of polar chiral (counterclockwise or clockwise) active particles in a two-dimensional box with periodic boundary conditions.

scholarly journals Fabricating large two-dimensional single colloidal crystals by doping with active particles

Soft Matter ◽  
2016 ◽  
Vol 12 (14) ◽  
pp. 3406-3411 ◽  
Author(s):  
B. van der Meer ◽  
L. Filion ◽  
M. Dijkstra
Keyword(s):  
Colloidal Crystals ◽  
Two Dimensional ◽  
Active Particles

scholarly journals Unusual Bound or Localized States

2001 ◽  
Vol 56 (1-2) ◽  
pp. 48-60 ◽  
Author(s):  
M. A. Cirone ◽  
G. Metikas ◽  
W. P. Schleicha
Keyword(s):  
Quantum Mechanics ◽  
Ground State ◽  
Schrodinger Equation ◽  
Three Dimensional ◽  
Equation Of Motion ◽  
Localized States ◽  
Two Dimensional ◽  
Zero Energy ◽  
Classical Physics ◽  
Oscillating Potential

Abstract We summarize unusual bound or localized states in quantum mechanics. Our guide through these intriguing phenomena is the classical physics of the upside-down pendulum, taking advantage of the analogy between the corresponding Newton’s equation of motion and the time independent Schrödinger equation. We discuss the zero-energy ground state in a three-dimensional, spatially oscillating, potential. Moreover, we focus on the effect of the attractive quantum anti-centrifugal potential that only occurs in a two-dimensional situation.

scholarly journals Dynamics on the web: spiders use physical rules to solve complex tasks in mate search and competition

2021 ◽  
Author(s):  
Amir Haluts ◽  
Sylvia F. Garza Reyes ◽  
Dan Gorbonos ◽  
Alex Jordan ◽  
Nir S. Gov
Keyword(s):  
Animal Behaviour ◽  
Two Dimensional ◽  
Effective Interactions ◽  
Complex Tasks ◽  
Active Particles ◽  
Mate Search ◽  
Seismic Vibrations ◽  
Daunting Challenge ◽  
Standing Question ◽  
The Web

ABSTRACTA long-standing question in animal behaviour is how organisms solve complex tasks. Here we explore how the dynamics of animal behaviour in the ubiquitous tasks of mate-search and competition can arise from a physics-based model of effective interactions. Male orb-weaving spiders of the genus Trichonephila are faced with the daunting challenge of entering the web of a much larger and potentially cannibalistic female, approaching her, and fending off rival males. The interactions that govern the dynamics of males within the confined two-dimensional arena of the female’s web are dominated by seismic vibrations. This unifying modality allows us to describe the spiders as interacting active particles, responding only to effective forces of attraction and repulsion due to the female and rival males. Our model is based on a detailed analysis of experimental spider trajectories, obtained during the approach of males towards females, and amidst their interactions with rival males of different sizes. The dynamics of ’spider particles’ that emerges from our theory allows us to explain a puzzling relationship between the density of males on the web and the reproductive advantages of large males. Our results provide strong evidence that the simple physical rules at the basis of our model can give rise to complex fitness related behaviours in this system.

Directional transport of active particles in the two-dimensional asymmetric ratchet potential field

2020 ◽  
Vol 34 (12) ◽  
pp. 2050125 ◽  
Author(s):  
Yu-Qing Wang ◽  
Cheng Huang ◽  
Chao-Fan Zhou ◽  
Chang Xu ◽  
Sheng-Jie Qiang ◽  
...  
Keyword(s):  
Friction Coefficient ◽  
Potential Field ◽  
Statistical Physics ◽  
The Self ◽  
Critical Parameters ◽  
Two Dimensional ◽  
Active Particles ◽  
Brownian Particles ◽  
Directional Transport ◽  
Ratchet Potential

Relationship between matter and energy transport has always been one of the key issues that researchers have been searching for in statistical physics and complexity science. In many transport phenomena, the active transport with zero or even no external force in life activities has attracted extensive attention of scholars. As a special kind of active particles, active Brownian particles have received the attention of physicists and biophysicists. These active particles are natural or artificially designed particles, whose scale is in the order of micrometer or nanometer. Different from the traditional passive Brownian particles driven by the equilibrium heat wave generated by the random collision of the surrounding fluid molecules, active Brownian particles can extract energy from their own environment to drive their own motion. Here, directional transport process of active particles in the two-dimensional asymmetric ratchet potential field is analyzed. Both the overdamped medium and the critically damped one are emphasized. Langevin equations with inertia term are introduced to describe the impacts of the self-driven force, friction coefficient, etc. on the directional motion. Then, the average particle speed is found. Thereafter, the relationships between the speed and critical parameters like self-driven force, friction coefficient, etc. are obtained. Two different dynamical domination mechanisms are found, which are expressed as the random collision domination and the self-driven force domination, respectively. Furthermore, the random collision domination is found to correspond to the much higher peak of the two-dimensional asymmetric Brownian rachet potential field, while the self-driven force domination is found to correspond to the much lower peak of the introduced potential. The study will be helpful for discovering the stochastic thermodynamics mechanisms in nonlinear dynamics and nonlinear properties of such multibody interaction system in statistical physics and complex system science.

Spectrophotometric measurements of objective-prism spectra

1966 ◽  
Vol 24 ◽  
pp. 118-119
Author(s):  
Th. Schmidt-Kaler
Keyword(s):  
Progress Report ◽  
Two Dimensional ◽  
Objective Prism ◽  
Made In

I should like to give you a very condensed progress report on some spectrophotometric measurements of objective-prism spectra made in collaboration with H. Leicher at Bonn. The procedure used is almost completely automatic. The measurements are made with the help of a semi-automatic fully digitized registering microphotometer constructed by Hög-Hamburg. The reductions are carried out with the aid of a number of interconnected programmes written for the computer IBM 7090, beginning with the output of the photometer in the form of punched cards and ending with the printing-out of the final two-dimensional classifications.

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