Machac J.,Czech Technical University |
Polivka M.,Czech Technical University |
Zemlyakov K.,St Petersburg Electrotechnical University
IEEE Transactions on Antennas and Propagation | Year: 2013
This communication presents the results of an investigation of a new version of a leaky wave antenna designed on a CRLH substrate integrated waveguide. The antenna operates in two frequency bands and its main beam can be steered from backward to forward direction by changing the frequency. The antenna structure is planar and can be fabricated by a standard PCB technology, so it is suitable for mass production. An efficient method for determining the complex dispersion characteristic of periodic 1D structure is proposed. © 1963-2012 IEEE.
Demidovich V.B.,St Petersburg Electrotechnical University |
Rastvorova I.I.,St. Petersburg State Mining Institute
Russian Electrical Engineering | Year: 2014
A combined method for numerical computation of the electromagnetic field in induction-heating systems is proposed and used. The method consists in a combination of methods of integral equations for the computation of the electromagnetic field in the area outside the load and methods of finite elements or finite differences for the computation of the electromagnetic field inside the load. A method of simulation of electrotechnical systems with simultaneous solving of circuit and field problems is proposed based on this method. Using the example of induction-heating devices, an external problem associated with the computation of circuit inductors, power supplies, and balancing capacitors and an internal problem related to the computation of the electromagnetic field and internal heat sources inside the load are formulated. The simulation of induction heaters is considered taking into account features of thyristor frequency converters with a parallel inverter. © 2014, Allerton Press, Inc.
Mukhin N.V.,St Petersburg Electrotechnical University
Glass Physics and Chemistry | Year: 2014
A one-dimensional model describing the diffusion of intrinsic defects in lead zirconate titanate (LZT) films of nonstoichiometric composition during their high-temperature treatment is proposed. The model includes the diffusion of vacancies by lead and oxygen, the formation and decay of their associates, interaction with extensive defects (dislocations in LZT films and the near-surface layer), interstitial inclusions, and LZT film contact with air leading to lead oxide evaporation from LZT film and its saturation by oxygen. The dependences of LZT film composition on the temperature and time of treatment are calculated. The possibility the concentration's oversaturation by lead in a near-surface layer of LZT film, which can lead to the release of lead oxide, is shown. © 2014 Pleiades Publishing, Ltd.
Agency: GTR | Branch: EPSRC | Program: | Phase: Research Grant | Award Amount: 151.22K | Year: 2007
The functional electroceramics market is multibillion pounds in value and growing year by year. Electroceramic components are vital to the operation of a wide variety of home electronics, mobile communications, computer, automotive and aerospace systems. The UK ceramics industry tends to focus on a number of specialist markets and there are new opportunities in sensors, communications, imaging and related systems as new materials are developed. To enable the UK ceramics community to benefit from the new and emerging techniques for the processing and characterisation of functional electroceramics a series of collaborative exchanges will be undertaken between the three UK universities (Manchester, Sheffield and Imperial College) and universities and industry in Europe (Austria, Germany, Russia, Czech Republic), the USA and Asia (Japan, Taiwan and Singapore). These exchanges will enable the UK researchers (particularly those at an early stage of their careers) to learn new experimental and theoretical techniques. This knowledge and expertise will be utilised in the first instance in the new bilateral collaborative projects, and transferred to the UK user communities (UK universities and UK industry). A number of seminars and a two day Workshop will be held to help the dissemination of knowledge.
Tong W.,Colorado State University |
Tong W.,Chinese Academy of Sciences |
Wu M.,Colorado State University |
Carr L.D.,Colorado School of Mines |
Kalinikos B.A.,St Petersburg Electrotechnical University
Physical Review Letters | Year: 2010
This Letter reports experimental results on random temporal dark solitons. One excites an incoherent large-amplitude propagating spin-wave packet in a ferromagnetic film strip with a repulsive, instantaneous nonlinearity. One then observes the random formation of dark solitons from this wave packet. The solitons appear randomly in time and in position relative to the entire wave packet. They can be gray or black. In spite of the randomness of the initial wave packets and the random formation processes, the solitons show signatures that are found for conventional coherent dark solitons. © 2010 The American Physical Society.