We suggest a hypothesis of the Multiverse which, contrary to other similar hypotheses, can be verified experimentally already at the present time. This Multiverse allows for bidirectional visits of inhabitants from different parallel Universes through portals which have nothing to do with the so-called ‘wormholes’. However, since portal borders are invisible and portals themselves may appear an...

Travelling waves are the physical basis of frequency discrimination in many vertebrate and invertebrate taxa, including mammals, birds, and some insects. In bushcrickets (Tettigoniidae), the crista acustica is the hearing organ that has been shown to use sound-induced travelling waves. Up to now, data on mechanical characteristics of sound-induced travelling waves were only available along the ...

When there are no strikes or natural disasters, travelling usually is a pleasure. Some of us have returned from the annual conference of the American Society for Bioethics and Humanities in San Diego, while others have good memories of the 10th World Congress of Bioethics in Singapore last summer. But not only bioethicists are travelling, bioethics itself is as well, following the globalization...

We present a general framework for the homogenisation theory of space-time metamaterials. By mapping to frame co-moving with modulation, we derive analytical formulae effective material parameters travelling wave modulations in low frequency limit: electric permittivity, magnetic permeability and magnetoelectric coupling. Remarkably, show that is exact at all frequencies absence back-reflection...

seismic waves travelling through inelastic media are attenuated by the conversion of elastic energy into heat. upon being attenuated, the travelling wave changes: amplitude is reduced, travelling waveform is modified due to high-frequency content absorption, and phase is delayed. attenuation is usually quantified through the quality factor q: the ratio between the energy stored and lost in each...

The algorithm of Ant Colony System (ACS) has been found attractive for solving combinatorial optimization problem such as Travelling Salesman Problem (TSP). The run-time for this algorithm increases with increase in number of nodes. In this paper, we propose an efficient method that reduces the run-time for very large-scale Euclidean TSP problem and yet conserve the quality of solution for cert...

Introduction: The number of travellers from Greece who travel to sub-Saharan Africa has increased during the last decade. Our aim in this research was to study vaccination patterns for travellers travelling to sub-Saharan Africa.Methods: A cross-sectional study was conducted from January 2011 until December 2014 in all (57) public health departments in Gr...

We develop mathematical models to examine the formation, growth and quorum sensing activity of bacterial biofilms. The growth aspects of the model are based on the assumption of a continuum of bacterial cells whose growth generates movement, within the developing biofilm, described by a velocity field. A model proposed in Ward et al. (2001) to describe quorum sensing, a process by which bacteri...

An e cient way of obtaining travelling waves in a periodic uid system is described and tested. We search for steady states in a reference frame travelling at the wave phase velocity using a rst-order pseudospectral semi-implicit time scheme adapted to carry out the Newton’s iterations. The method is compared to a standard Newton–Raphson solver and is shown to be highly e cient in performing thi...