Communication satellite systems for Alaska

Technical and cost factors for implementation of Alaskan communication satellite syste

DC-assisted microwave quenching of YBa2Cu3O7-{\delta} coplanar waveguide to a highly dissipative state

The paper reports on finding the effect of a strong change in the microwave losses in an HTS-based coplanar waveguide (CPW) at certain values of the input power Pin and direct current Idc. CPW on the basis of 150 nm thick YBa2Cu3O7-{\delta} epitaxial film on a single crystal MgO substrate was studied experimentally. A sharp and reversible transition of the CPW into a strongly dissipative state at the certain meanings of Pin and Idc depending on temperature was observed. Apparently the effect can be explained by self-heating of HTS structure caused by magnetic flux flow under the joint influence of MW and DC.Comment: 9 pages, 5 figures, 17 reference

Multiresonances of quasi-trapped modes in metasurfaces based on nanoparticles of transition metal dichalcogenides

The features of polarization control of multiple multiresonances for quasi-trapped modes excited by synchronization of bianisotropic dipole responses in MoS$_2$ disks with a hole are considered. Using the numerical calculations with analytical multipole analysis, we showed that the presence of a strong optical anisotropy of MoS$_2$ nanoparticles provides an additional degree of freedom and allows to observe several resonances of electric and magnetic dipoles at once in a narrow spectral range. Based on the simulation results, we obtained the frequency dependences for the dipole polarizabilities of the MoS$_2$ disk with a hole, which allow one to distinguish the contributions of the nonlocal and bianisotropic dipole responses and possessing several features in the near infrared range. Using the polarizability spectra of single nanoparticles and applying the tuning strategy, the design of the MoS$_2$ metasurface supporting three resonances of quasi-trapped modes at once in a narrow spectral range was developed. One of these resonances corresponds to the telecom wavelength of 1550 nm. The spectrum of light reflection for MoS$_2$ metasurface is characterized by three narrowband dips corresponding to the wavelengths of the quasi-trapped modes. It was shown that a change in the polarization of a wave normally incident on the metasurface to orthogonal one leads to a change in the type of bianisotropic response excited in each MoS$_2$ disk and to the excitation of three other features in the reflection spectra of the metasurface at wavelengths close to the initial values.Comment: 8 pages, 5 figure

Cluster Analysis of the Innovative Potential of Russian Regions

One of the main directions of economic development of the Russian Federation is the increasing of the role of innovative production and reorganization of the economic system needed to accelerate the pace of formation of the innovative economy. Despite the tasks set by the strategy of innovative development of the Russian Federation for the period up to 2020, the pace of innovative development of the state economy, and accordingly regional economies, is extremely low, and the share of foreign technologies in production processes exceeds 60%. The reformation of the vision of strategic development of innovation economy in Russia is directly connected with defining the actual level of innovative development of regions and formation of mechanisms for the creation of regional and interregional scientific-technical research and innovation infrastructure, which in the long term will provide the current trends of innovative development. Today, the vast majority of regional economies have a high need for new technologies and the formation of the domestic base of scientific and technical production. The needs of the regions are determined not only by the obsolescence of production bases and technological resources, but also by the growing imbalance between the levels of development of regional economies and their isolation. One of the possible options for strategic management of innovative development is the creation the mechanisms of formation regional and interregional innovation and scientific and technical clusters, and, as a consequence, production clusters. However, in order to apply the advantages of cluster development, it is necessary to study the innovative potential of the subjects of the Russian Federation, which will ensure an effective combination of regional economies. This article presents the results of the cluster analysis of the subjects of the Russian Federation on one of the indicators of the innovative potential of the regional economy, as well as the key trends of innovative development of the subjects of the Russian Federation included in the identified clusters