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The aim of this paper is to present the particulars of new research in special numerical models of structures used for nanoapplications. These models can be advantageously used in the evaluation of electromagnetic parameters, thus helping researchers and designers to solve problems related to nanoelements and nanotechnology. The first numerical model of large periodic structure is designed to test electromagnetic wave propagation in a graphene composite structure. According to the interpretation of the results, the basic design will be prepared for experimental fabrication of the functional sample. [ABSTRACT FROM AUTHOR]

The authors discuss the application of broadband noise signal in the research of periodic structures and present the basic testing related to the described problem. The aim is to find a metrological method utilizable for the investigation of metamaterials in the frequency range between 100MHz and 10GHz; this paper therefore characterizes the design of a suitable measuring technique based on noise spectroscopy and introduces the first tests conducted on a periodic structure (metamaterial). In this context, the applied equipment is also shown to complement the underlying analysis. [ABSTRACT FROM AUTHOR]

The paper is concerned with a comparison of the properties of RF coils of three configurations for MRI measurements on small animals. In comparison with the classical saddle coil the proposed modification of slotted-tube coil exhibits identical homogeneity of B1 field in a larger space. The parallel-plate coil has a satisfactory homogeneity of B1 field over the whole internal space. The signal-to-noise ratio measured for all three coils is roughly the same and is given by the magnitude of RF pre-amplifier noise. As the slotted-tube and parallel-plate coils have a lower inductance compared with the saddle coil, they can be tuned to resonance on the 200 MHz frequency even at larger dimensions. The results show that the parallel-plate coil has very good properties for the measurement of small animals.

The aim of the overview study is to describe the currently used methods of primary median sternotomy closure in adult cardiac surgery. In the review of published literature, we draw on the data and focus on the methodology, indications, advantages, limitations, biomechanical and clinical results of the different methods in relation to the incidence of deep sternal wound complications after median sternotomy in adult cardiac surgery.Key words: sternum sternotomy adult cardiac surgery surgical procedures.