- Published on 11 September 2019
The understanding of wetting presents formidable challenges due to a multi-scale nature of the problem, where macroscopic behavior can be directly related to non-trivial microscopic and/or mesoscopic interactions. The aim of this topical issue is to provide to the community recent advances, unresolved problems, contemporary computational techniques and the state-of-the-art theoretical and experimental developments in the field of wetting phenomena in general. Probing the wetting phenomena down to the nano-scale can help to understand the physical processes involved in the interaction of a liquid with a solid surface and therefore the center of recent intense activities with the advent of new nano-materials. We aim to draw attention to some of key questions:
- What are the range of length and time scales characterizing the interaction of the substrate with the two-phase flow?
- Which computational tools are more amenable to a multiscale organization?
- Can matching hydrodynamic theories to a molecular description of the contact line be done seamlessly?
- What are the most appropriate existing or to be developed experiments for benchmarking computational results?
- Can we make more educated suggestions when to use which computational tools for a particular wetting system?
This special issue will invite original contributions and review-type articles to further foster and encourage synergetic discussions. Publications in such special issue should in principle contain, for example, one or more of the following topics, but not limited to:
- New modeling, experimental and computational approaches of wetting phenomena on small scales.
- Challenges in methodologies, numerical, theoretical and experimental, for probing wetting phenomena on nanoscales.
- New opportunities in multiscale modeling, bridging the dynamics of the contact line at the mesoscopic length scales to the macroscopic flow.
- Alternative observations/assessments of the wetting phenomena.
Guest Editors: Tatiana Gambaryan-Roisman, Shahriar Afkhami and Len Pismen
For any queries please contact Shahriar Afkhami.
Call for papers:
The Guest Editors invite authors to submit their original research and short reviews on the theme of the Special Issue of the European Physical Journal Special Topics. Articles should be submitted to the Editorial Office of EPJ ST by selecting the "Challenges in Nanoscale Physics of Wetting Phenomena" as a special issue at: https://articlestatus.edpsciences.org/is/epjst/home.phpAuthors submitting to the issue should follow submission guidelines here. Manuscripts should be prepared using the latex template of EPJ ST, which can be downloaded here.
- Published on 10 September 2019
- Published on 13 May 2019
For many years, researchers have believed that the formation of strange attractors in a dynamical system is related to a saddle point in its structure. Many well-known systems with chaotic attractors such as Lorenz, Rossler, and Chen system have a saddle point equilibria. This category of chaotic attractors is familiar and finding their chaotic attractors are easy since they are formed near the saddle points. In other words, most chaotic systems have a strange attractor around their saddle point equilibria and can be easily designed. In 2011, Sprott presented some standards to propose new systems with strange attractors. He proposed that a new chaotic system should satisfy at least one of the following three conditions: First, the proposed systems should model some important unsolved problem in nature. Second, the systems should exhibit some behavior previously unobserved. Finally, the system should be simpler than all other known examples exhibiting the observed behavior. For example, the Lorenz system satisfy all of those conditions in its first publication in 1963.
In the last decade, some novel dynamical systems with chaotic attractor have been found that did not have any saddle point equilibria. Till now many new chaotic systems have been proposed in this category. We call those systems “special”. In other words, chaotic systems which satisfy the novelty conditions and are not common, are in this category. Chaotic systems without any equilibria, chaotic systems with a line of equilibria, chaotic systems with curve of equilibria, and with surfaces of equilibria are in this category.
The dynamic of chaotic systems depends on the initial conditions as well as parameters. So a system can show different coexisting attractors in the constant parameters just by varying initial conditions. Such a system is called “multi-stable”. A system which has countable infinity of coexisting attractors are called “mega-stable”, while systems with uncountable infinity of coexisting attractors are called “extreme multi-stable”. Chaotic systems with different multi-stabilities can satisfy the novelty conditions of the standard of proposing chaotic systems. Another interesting dynamic in the special chaotic systems is the coexistence of symmetric attractors.
Chaotic attractors can be categorize into self-excited or hidden attractors. Self-excited attractors are those attractors which their basin of attraction contains an unstable equilibrium while the basin of attraction in hidden attractors are not related to any equilibrium point. Hidden chaotic attractors are one of the hottest topics in the study of special chaotic systems. Many novel systems have been proposed with hidden attractors. Rare attractors are those attractors in which their basins of attraction are very small. Chaotic systems with rare attractors has attracted lots of attentions. Systems with multi-scroll chaotic attractors are other interesting dynamical systems. However, in the study of novel chaotic attractors with any special property, it is very important that the system be the simplest one with that feature.
Chaotic systems can be categorized based on their dissipation. A system is called conservative if its dissipation is zero. Some systems are “nonuniformly conservative”. It means that they are globally conservative, but they have some regions of state space in which the system is dissipative and some other regions which is anti-dissipative. Also, there are some other features which are worth in the study of new chaotic systems.
Call for papers: We would like to cordially invite further authors to submit their original research papers for this special issue along the lines described above. An extended description of the critical aspects/open problems of the methods presented will be a stringent criterion of pre-selection of papers to be sent to referees. Articles may be one of four types: (i) minireviews (10-15 pages), (ii) tutorial reviews (15+ pages), (iii) original paper v1 (5-10 pages), or (iv) original paper v2 (3-5 pages). More detailed descriptions of each paper type can be found here. Manuscripts should be prepared using the latex template of EPJ ST, which can be downloaded here. Articles should be submitted to the Editorial Office of EPJ ST by selecting "Special Chaotic Systems" as a special issue at:https://articlestatus.edpsciences.org/is/epjst/home.php
Guest Editors: Tomasz Kapitaniak (Division of Dynamics, Technical University of Lodz, Lodz, Poland) and Sajad Jafari (Biomedical Engineering Department, Amirkabir University of Technology, Tehran, Iran)
Submission Deadline: 31 October 2019
EPJ ST Special Issue: Nonextensive Statistical Mechanics, Superstatistics and Beyond: Theory and Applications in Astrophysical and Other Complex Systems
- Published on 07 September 2018
After more than 140 years of impressive success there is no reasonable doubt that the Boltzmann-Gibbs (BG) entropy is the correct one to be used for a wide and important class of physical systems, basically those whose (nonlinear) dynamics is strongly chaotic i.e., for classical systems with positive maximal Lyapunov exponent, which are mixing and ergodic. However, a plethora of physical complex systems exists for which such simplifying dynamical hypotheses are violated; typical examples are those for which the maximal Lyapunov exponent vanishes, leading to sub-exponential sensitivity to the initial conditions, which can of course occur in a variety of mathematical ways.
Corresponding anomalies are found in a variety of quantum systems as well. In order to statistically describe the dynamics of such systems, various generalised forms of statistical mechanics have been proposed such as those using the nonadditive entropies Sq (where q is a real number which, for q=1, recovers the BG entropy), kappa distributions (also known as q-Gaussians, where kappa is simply related to q), superstatistical approaches, among various others. In the last decades, these new generalised statistical mechanical formalisms have found a large variety of very successful applications, even beyond the realm of physics. This special issue aims to cover the most recent analytical, experimental, observational and computational aspects and examples where these new extended formalisms have found fruitful applications.
Topics include, but are not limited to:
- Generalised Central Limit theorems
- Generalised Large deviation theory
- Low-dimensional nonlinear conservative and dissipative dynamical systems near the edge of chaos
- Long-range-interacting many-body classical Hamiltonian systems
- Complex networks
- Area-law-like quantum systems
- Applications in astrophysics, space and other plasma physics, geophysics, high energy physics, cosmology, granular matter, cold atoms, econophysics, theoretical and structural chemistry, biophysics, social systems, power grids, image and time series processing, among others.
Guest Editors: Andrea Rapisarda, Constantino Tsallis, Christian Beck, George Livadiotis, Ugur Tirnakli, and Giorgio Benedek.
Call for papers:
The Guest Editors invite authors to submit their original research and short reviews on the theme of the Special Issue of the European Physical Journal - Special Topics. Articles should be submitted to the Editorial Office of EPJ ST by selecting the "Nonextensive Statistical Mechanics, Superstatistics and Beyond" as a special issue at: https://articlestatus.edpsciences.org/is/epjst/home.php