Optimized Stealth Design and Remolding of Target Unmanned Aerial Vehicle

In order to satisfy the imperious requirements of low-detectable target aircraft in the current test and evaluation of airborne radar and to remedy the numerous defects of magnetic microwave absorbing coating in the practical application, a new type of light-weight electric loss coating with the carbon nanotubes(CNTs) was proposed by the optimal design of the absorbent content and coating thickness. A type of target unmanned aerial vehicle(UAV) with representative non-stealth structure was remolded by the present type of coating, and the detection range of airborne radar to the remolded UAV was obtained in the flight test. The results reveal that the microwave absorbing coating with a thickness of 2.5mm has the optimized microwave absorbing properties at a CNTs content of 15wt.%, and the reflection loss value can be inferior to -8dB over the whole X band. The intensity level of scattering center of the UAV degrades after coated, and the radar cross section (RCS) of coated UAV decreases by 20dB in the flight test.

Additional electric loss in rural distribution networks 0.38 kV

The article presents calculations the additional electric loss in the case of three-phase voltage system unbalance in the real rural electrical distribution networks (0.38 kV). Measurements were carried out at substations that receive power from distribution substation “Petropavlovsk”. Measurements were carried out using a certified device “Resource-UF2M”. Also presented are graphs of changes in currents/voltages of the negative-sequence and zero-sequence, electric loss and other parameters. The results of the economic assessment of electricity losses are presented. As a result, the proposed method for reducing the power loss factor, that can reduce the losses of electricity.

Broadband microwave absorber constructed by reduced graphene oxide/La0.7Sr0.3MnO3 composites

High-performance microwave absorbing materials require optimized impedance matching and high attenuation ability. To meet these requirements, rGO/LSMO composites were prepared thereby incorporating electric loss with magnetic loss materials.

Properties and Practical Application of Nanoporous Silicate Matrices, Filled with Mixture of NaNO2 and BaTiO3 Ferroelectrics. influence of Co-Encapsulation

Results of research the characteristics of MCM-41 porous silica matrix, encapsulated into her pores by sodium nitrite and its mix with barium titanate were presented. Nature of changes the impedance frequency dispersion, electric loss tangent and dielectric permittivity of intercalates, synthesized under heating, lighting and magnetic field were identified. The conditions, under which the synthesized nanohibrydes can be interesting in terms of formation the structures of electric energy quantum battery and capacitive apexes for reading information from magnetic media, were found.

Novel Glass-free LTCC Material co-fired with Cupper-Electrodes

Low Temperature Co-fired Ceramics (LTCC) have excellent high-frequency characteristics and have widely been used for microwave electronic components. By lowering the sintering temperature of the ceramics used as insulating layers, LTCC was co-fired with a high-conductivity wiring conductor, such as Cu or Ag. LTCC substrate has been expected as one of the most promising technologies to realize miniaturization of RF circuits in the field of wireless communications. There is no limitation to demand for further downsizing of RF circuits, suppression of electric loss and high mechanical strength of the substrate. However, conventional LTCC materials for substrates contain glass frit which causes defects, such as pores or cracks, and low mechanical strength. In this work, we have developed a novel LTCC material system BaO-Al2O3-SiO2-MnO-TiO2, without any glass frits. The material was co-fired with cupper electrodes, which have low resistivity and show less diffusion than silver in LTCC, under a low-oxygen partial pressure atmosphere (mixture of N2 and H2) at 980°C. Thin layers (8μm) of the material showed high insulating resistivity and reliability due to few defects, such as pores, in LTCC. Its dielectric and mechanical properties were measured as 6.8 (low-εr), 350 at 3GHz (high-Q-value) and 341MPa (high mechanical strength) respectively. This LTCC material will contribute to further miniaturizing of microwave applications and integration of passive elements.