scholarly journals Characterization of MIPS in a suspension of repulsive active Brownian particles through dynamical features

2021 ◽  
Vol 154 (16) ◽  
pp. 164901
Author(s):  
José Martin-Roca ◽  
Raul Martinez ◽  
Lachlan C. Alexander ◽  
Angel Luis Diez ◽  
Dirk G. A. L. Aarts ◽  
...  
Keyword(s):  
Brownian Particles ◽  
Dynamical Features

Characterization of fibromyalgia using sleep EEG signals with nonlinear dynamical features

2019 ◽  
Vol 111 ◽  
pp. 103331 ◽  
Author(s):  
Jose Kunnel Paul ◽  
Thomas Iype ◽  
Dileep R ◽  
Yuki Hagiwara ◽  
JoelE.W. Koh ◽  
...  
Keyword(s):  
Sleep Eeg ◽  
Eeg Signals ◽  
Nonlinear Dynamical ◽  
Dynamical Features

scholarly journals Characterization of aqueous cellulose nanofiber dispersions from microscopy movie data of Brownian particles by trajectory analysis

2019 ◽  
Vol 1 (1) ◽  
pp. 421-429 ◽  
Author(s):  
Reiji Motohashi ◽  
Itsuo Hanasaki
Keyword(s):  
Rheological Properties ◽  
Trajectory Analysis ◽  
Colloidal Particles ◽  
Cellulose Nanofibers ◽  
Cellulose Nanofiber ◽  
Dynamical Characteristics ◽  
Brownian Particles

Cellulose nanofibers (CNFs) are not directly visible by microscopes when dispersed in water, but the dynamical characteristics of suspended colloidal particles tells us the texture as well as the rheological properties of CNF dispersions beyond the viscosity.

scholarly journals Dynamics landscape for acoustic superradiance

2020 ◽  
Vol 378 (2177) ◽  
pp. 20200003 ◽  
Author(s):  
Cisco Gooding
Keyword(s):  
Born Approximation ◽  
Acoustic Scattering ◽  
Microscopic Level ◽  
Rotating Fluid ◽  
Analogue Gravity ◽  
Theoretical Predictions ◽  
Dynamical Features ◽  
Vortex Beams ◽  
Similarities And Differences

We analyse the behaviour of acoustic vortex beams interacting with rotating, fluid-saturated porous materials. Regions of the parameter space that exhibit distinct dynamical features are identified, with a focus on features that are relevant to the characterization of rotational superradiance. We discuss the similarities and differences between two recent proposals to observe acoustic superradiance with rotating, air-saturated sound absorbers. Finally, theoretical predictions for macroscopic acoustic scattering, obtained by averaging over interactions between the fluid and the porous material at the microscopic level, are compared with predictions of the first-Born approximation. This article is part of a discussion meeting issue ‘The next generation of analogue gravity experiments’.

scholarly journals A Coarse Grained Model for DNA and Polymer Packaging: Statics and Dynamics

2005 ◽  
Vol 6 (2) ◽  
pp. 115-117 ◽  
Author(s):  
I. Ali ◽  
D. Marenduzzo ◽  
C. Micheletti ◽  
J. M. Yeomans
Keyword(s):  
Coarse Grained ◽  
Viral Capsids ◽  
Coarse Grained Model ◽  
Flexible Polymer ◽  
Numerical Characterization ◽  
Bacteriophage Genome ◽  
Statics And Dynamics ◽  
Dynamical Features ◽  
Semi Flexible Polymer

We present a numerical characterization of the statics and dynamics of the packaging of a semi-flexible polymer inside a sphere. The study is motivated by recent experiments on the packaging of DNA inside viral capsids. It is found that the force required to confine the coarse-grained polymer is in fair agreement with that found in experiments for the packaging of the phi29 bacteriophage genome. Despite its schematic nature, the model is capable of reproducing the most salient dynamical features of packaging experiments such as the presence of pauses during individual packaging processes and the trend of the resisting force as a function of chain packed fraction.

scholarly journals Self-Organization through the Inner Heliosphere: Insights from Parker Solar Probe

Atmosphere ◽  
2021 ◽  
Vol 12 (3) ◽  
pp. 321
Author(s):  
Mirko Stumpo ◽  
Virgilio Quattrociocchi ◽  
Simone Benella ◽  
Tommaso Alberti ◽  
Giuseppe Consolini
Keyword(s):  
Phase Transition ◽  
Self Organization ◽  
Dynamical Phase Transition ◽  
Dynamical Phase ◽  
Solar Wind Magnetic Field ◽  
Field Fluctuations ◽  
Dynamical Features ◽  
Scaling Features ◽  
Inner Heliosphere

The interplanetary medium variability has been extensively studied by means of different approaches showing the existence of a wide variety of dynamical features, such as self-similarity, self-organization, turbulence and intermittency, and so on. Recently, by means of Parker solar probe measurements, it has been found that solar wind magnetic field fluctuations in the inertial range show a clear transition near 0.4 AU, both in terms of spectral features and multifractal properties. This breakdown of the scaling features has been interpreted as the evidence of a dynamical phase transition. Here, by using the Klimontovich S-theorem, we investigate how the process of self-organization is under way through the inner heliosphere, going deeper into the characterization of this dynamical phase transition by measuring the evolution of entropic-based measures through the inner heliosphere.

scholarly journals Observation of strato-mesospheric CO above Kiruna with ground-based microwave radiometry – retrieval and satellite comparison

2011 ◽  
Vol 4 (11) ◽  
pp. 2389-2408 ◽  
Author(s):  
C. G. Hoffmann ◽  
U. Raffalski ◽  
M. Palm ◽  
B. Funke ◽  
S. H. W. Golchert ◽  
...  
Keyword(s):  
Middle Atmosphere ◽  
Total Error ◽  
Microwave Radiometer ◽  
Optimal Estimation ◽  
Kernel Functions ◽  
Error Assessment ◽  
High Bias ◽  
Dynamical Features ◽  
Satellite Instruments

Abstract. CO serves as a tracer for dynamics in the polar winter middle atmosphere. This work presents the retrieval and the characterization of ground-based CO measurements from the winters 2008/2009 and 2009/2010 by the Kiruna microwave radiometer KIMRA, located in northern Sweden (67.8° N, 20.4° E). Furthermore, the dataset is used for an extensive comparison to the recent satellite instruments MLS on Aura, ACE-FTS, and MIPAS on Envisat. The vmr profiles are retrieved using the optimal estimation approach. A detailed analysis of the averaging kernel functions is carried out, showing sensitivity of the measurements between 40 and 80 km altitude, a vertical resolution of 16 to 22 km, as well as a residual influence of the region up to 130 km altitude. An error assessment reveals a total error of the retrieved profile that increases with altitude and is approx. ±0.1 ppmv at 50 km altitude and ±3 ppmv at 80 km altitude. The main contributions to this total error arise from the measurement noise and the uncertainty of the used temperature profiles. The expected dynamical features of the polar winter middle atmosphere are qualitatively identified in the retrieved time series, but are not quantitatively analyzed here. The dense MLS dataset is used to investigate the influence of the collocation criteria on the satellite comparison, showing that relaxing the distance criterion causes a high bias for MLS. The comparison including the other instruments is difficult because of the small number of coincidences. However, it suggests that there is a general agreement between KIMRA and the satellite instruments below 65 km altitude, but a high bias for KIMRA above this altitude. Furthermore, the shape of the KIMRA profile appears to be systematically different from the satellite profiles.

False bifurcations in chemical systems: canards

1991 ◽  
Vol 337 (1646) ◽  
pp. 275-289 ◽  
Keyword(s):  
Phase Plane ◽  
Oscillatory System ◽  
Van Der Pol Oscillator ◽  
Variable Model ◽  
Stable And Unstable Manifolds ◽  
Chemical Systems ◽  
Dynamical Features ◽  
Theoretical Considerations

A canard is a false bifurcation in which the amplitude of an oscillatory system may change by orders of magnitude while the qualitative dynamical features remain unchanged. Recent theoretical considerations suggest that canards are characteristic of fast-slow dynamical systems and are associated with the stable and unstable manifolds of the phase plane. An alternative characterization of canard behaviour is proposed involving the crossing of an inflection line by a limit cycle growing out from an unstable stationary state. The inflection line comprises the locus of points at which the curvature of any phase plane trajectory is zero. The role of the inflection line in the onset of canard behaviour as well as in the continuity of the transition is examined in a two-variable model for the oscillatory EOE reaction, the Auto-catalator, and the two-variable Oregonator. The approach is also applied to the van der Pol oscillator, the system in which canard behaviour was first examined.

scholarly journals COGNITIVE NETWORK STRUCTURE: AN EXPERIMENTAL STUDY

2012 ◽  
Vol 15 (06) ◽  
pp. 1250084 ◽  
Author(s):  
ANDREA GUAZZINI ◽  
DANIELE VILONE ◽  
FRANCO BAGNOLI ◽  
TIMOTEO CARLETTI ◽  
ROSAPIA LAURO GROTTO
Keyword(s):  
Semantic Analysis ◽  
Virtual Community ◽  
Experimental Results ◽  
Theoretical Studies ◽  
Cognitive Network ◽  
Private And Public ◽  
Dynamical Features ◽  
The Difference ◽  
The One

In this paper, first we present the experimental results about a small group of people exchanging private and public messages in a virtual community. Our goal is to study the cognitive network that emerges during a chat seance. We used the Derrida coefficient and the triangle structure under the working assumption that moods and perceived mutual affinity can produce results complementary to a full semantic analysis. The most outstanding outcome is the difference between the network obtained considering publicly exchanged messages and the one considering only privately exchanged messages: In the former case, the network is very homogeneous, in the sense that each individual interacts in the same way with all the participants, whilst in the latter the interactions among different agents are very heterogeneous, and are based on "the enemy of my enemy is my friend" strategy. Finally, a recent characterization of the triangular cliques has been considered in order to describe the intimate structure of the network. Experimental results confirm recent theoretical studies indicating that certain three-vertex structures can be used as indicators for the network aging and some relevant dynamical features.

Phase behaviour and dynamical features of a two-dimensional binary mixture of active/passive spherical particles

Soft Matter ◽  
2020 ◽  
Vol 16 (5) ◽  
pp. 1162-1169
Author(s):  
Diego Rogel Rodriguez ◽  
Francisco Alarcon ◽  
Raul Martinez ◽  
Jorge Ramírez ◽  
Chantal Valeriani
Keyword(s):  
Binary Mixture ◽  
Phase Behaviour ◽  
Spherical Particles ◽  
Two Dimensional ◽  
Brownian Particles ◽  
Dynamical Features ◽  
Bidimensional Mixtures

In this work we have characterized the phase behaviour and the dynamics of bidimensional mixtures of active and passive Brownian particles.

scholarly journals Observation of strato-mesospheric CO above Kiruna with ground-based microwave radiometry – retrieval and satellite comparison

2011 ◽  
Vol 4 (4) ◽  
pp. 4209-4267 ◽  
Author(s):  
C. G. Hoffmann ◽  
U. Raffalski ◽  
M. Palm ◽  
B. Funke ◽  
S. H. W. Golchert ◽  
...  
Keyword(s):  
Middle Atmosphere ◽  
Total Error ◽  
Microwave Radiometer ◽  
Optimal Estimation ◽  
Kernel Functions ◽  
Error Assessment ◽  
High Bias ◽  
Dynamical Features ◽  
Satellite Instruments

Abstract. CO serves as a tracer for dynamics in the polar winter middle atmosphere. This work presents the retrieval and the characterization of ground-based CO measurements from the winters 2008/2009 and 2009/2010 by the Kiruna microwave radiometer KIMRA, located in northern Sweden (67.8° N, 20.4° E). Furthermore, the dataset is used for an extensive comparison to the recent satellite instruments MLS on Aura, ACE-FTS, and MIPAS on Envisat. The vmr profiles are retrieved using the Optimal Estimation approach. A detailed analysis of the averaging kernel functions is carried out, showing sensitivity of the measurements between 40 and 80 km altitude, a vertical resolution of 16 to 22 km, as well as a residual influence of the region up to 130 km altitude. An error assessment reveals a total error of the retrieved profile that increases with altitude and is approx. ±0.1 ppmv at 50 km altitude and ±3 ppmv at 80 km altitude. The main contributions to this total error arise from the measurement noise and the uncertainty of the used temperature profiles. The expected dynamical features of the polar winter middle atmosphere are qualitatively identified in the retrieved time series, but are not quantitatively analyzed here. The dense MLS dataset is used to investigate the influence of the collocation criteria on the satellite comparison, showing that relaxing the distance criterion causes a high bias for MLS. The comparison including the other instruments is difficult because of the small number of coincidences. However, it suggests that there is a general agreement between KIMRA and the satellite instruments below 65 km altitude, but a high bias for KIMRA above this altitude. Furthermore, the shape of the KIMRA profile appears to be systematically different from the satellite profiles.

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