Computer Model of a Frequency-Selective Surface on Mushroom-Shaped Metamaterial
This paper presents a computer model of a FSS based on mushroom-shaped metamaterial. The model is based on the calculation of equivalent distributed inductance and distributed capacitance of the unit cell of the surface according to its geometric dimensions. The computer model is realized as the “META” program based on MathCAD ver.15 software and provides an opportunity to investigate the dispersion characteristics of the frequency-selective surface of a “Maltese cross” mushroom-shaped metamaterial.
The conference is co-organized by the Foundation for Research and Technology – Hellas (FORTH), one of the biggest and most successful research centres in Greece, and in particular by its Institute of Electronic Structure and Laser (IESL), which is an internationally recognized center of excellence in Lasers and Applications, Microelectronics and Devices, Materials Science and Theoretical and Computational Physics. Besides FORTH, Crete has other Institutions, with more recognized the University of Crete, centered at Heraklion, which was classified among the top 100 young (less than 50 years old) Universities worldwide, as well as the Technical University of Crete, located in Chania, with emphasis in Engineering Sciences. All these institutions are characterized by high quality research and education, making Crete a place that combines a glorious past with an inspiring present.
Multispecies bacterial communities such as the microbiota of the gastrointestinal tract can be remarkably stable and resilient even though they consist of cells and species that compete for resources and also produce a large number of antimicrobial agents. Computational modeling suggests that horizontal transfer of resistance genes may greatly contribute to the formation of stable and diverse communities capable of protecting themselves with a battery of antimicrobial agents while preserving a varied metabolic repertoire of the constituent species. In other words horizontal transfer of resistance genes makes a community compatible in terms of exoproducts and capable to maintain a varied and mature metagenome. The same property may allow microbiota to protect a host organism, or if used as a microbial therapy, to purge pathogens and restore a protective environment.
Virtual simulation method is developed in the work. It based on virtual 3D-models of the structures of on-board electronic means designs with superimposed heterogeneous fields of electrical, thermal, mechanical and other processes caused by united impacts of external factors. A distinctive feature of this method is the account of the close relationship of the flowing physical processes between themselves during the simulation.
The article discusses current issues related to the development and application of virtual simulation to ensure the reliability of the electronic equipment in the presence of vibrations on the on-board equipment of the object of its installation. The authors constructed an algorithm of the method of ensuring vibration reliability of developed structures of electronic equipment in the process of virtual simulation with receiving the vibration fields on the structures and mechanical loads on each electronic component.
In this paper, an overview of slow wave systems and metamaterials using in devices intended for application in the area of biomedical engineering is presented. Short characteristic of physical and engineering specifications of slow waves systems and metamaterials are listed. In addition, possible variants of upgrading an exciting engineering solution by dint of slow wave systems and metamaterials application are offered.
The 18th International Vacuum Electronics Conference (IVEC 2017) helded on 24-26 April 2017 in London, UK. With technical co-sponsorship from the IEEE Electron Devices Society (EDS), the conference provide a forum for scientists and engineers from around the globe to present the latest developments in vacuum electronics technology at frequencies ranging from the UHF to THz frequency bands. IVEC was originally created in 2000 by merging the U.S. Power Tubes Conferences and the European Space Agency TWTA Workshops. Now a fully international conference, IVEC is held every other year in the U.S., and in Europe and Asia alternately every fourth year.
We consider an equilibrium ensemble of large Erdos-Renyi topological random networks with fixed vertex ˝ degree and two types of vertices, black and white, prepared randomly with the bond connection probability p. The network energy is a sum of all unicolor triples (either black or white), weighted with chemical potential of triples μ. Minimizing the system energy, we see for some positive μ the formation of two predominantly unicolor clusters, linked by a string of Nbw black-white bonds. We have demonstrated that the system exhibits critical behavior manifested in the emergence of a wide plateau on the Nbw(μ) curve, which is relevant to a spinodal decomposition in first-order phase transitions. In terms of a string theory, the plateau formation can be interpreted as an entanglement between baby universes in two-dimensional gravity. We conjecture that the observed classical phenomenon can be considered as a toy model for the chiral condensate formation in quantum chromodynamics.
In this work, a class of metamaterials is proposed on the basis of ferromagnet/superconductor hybridization for applications in magnonics. These metamaterials comprise of a ferromagnetic magnon medium that is coupled inductively to a superconducting periodic microstructure. Spectroscopy of magnetization dynamics in such hybrid evidences formation of areas in the medium with alternating dispersions for spin wave propagation, which is the basic requirement for the development of metamaterials known as magnonic crystals. The spectrum allows for derivation of the impact of the superconducting structure on the dispersion: it takes place due to a diamagnetic response of superconductors on the external and stray magnetic fields. In addition, the spectrum displays a dependence on the superconducting critical state of the structure: the Meissner and the mixed states of a type II superconductor are distinguished. This dependence hints toward nonlinear response of hybrid metamaterials on the magnetic field. Investigation of the spin wave dispersion in hybrid metamaterials shows formation of allowed and forbidden bands for spin wave propagation. The band structures are governed by the geometry of spin wave propagation: in the backward volume geometry the band structure is conventional, while in the surface geometry the band structure is nonreciprocal and is formed by indirect band gaps.
The Book of Abstracts contains the abstracts of the papers presented at the biannual International Conference “Micro- and Nanoelectronics – 2018” (ICMNE-2018) including the extended Session “Quantum Informatics” (QI-2018). The Conference topics cover the most of the areas dedicated to the physics of integrated micro- and nanoelectronic devices and related micro- and nanotechnologies. The Conference is focused on recent progress in those areas. It continues the series of the AllRussian Conferences (since 1994) and the International Conferences (since 2003).