Materials Literature
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A linear-to-circular polarization conversion transmitter is proposed using 3 × 3 periodic metallic strips, which are twisted 900 in the upper and bottom layers. The metallic strips are printed on both sides of the dielectric substrate that are subjected to enhance the axial ratio bandwidth at resonance frequencies. Th…
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Kazuhiro Kumahai, Akira Kurokawa; Development of a Reference Material for Image Sharpness Evaluation in Scanning Electron Microscopy, Microscopy and Microa
Nowadays the massive adoption of electronic converters to supply induction motors leads to critical problems during the normal operation. One of the most investigated problem is the unexpected early failure of the stator winding insulation. When the motors are supplied by electronic converters, the stator insulating s…
Common small-amplitude dielectric spectroscopy (DS) is restricted to linear response. We discuss here two concepts of DS at high voltages for characterizing nonlinear insulation behavior relevant for HVDC equipment. The first method uses the higher harmonics of the current, which are naturally generated by nonlinearit…
Polyimide/silver composite films were successfully prepared by in situ polymerization. A precursor, AgNO 3 was used as the source of the silver nanoparticles. The structure and morphology of resulting films were characterized by FTIR spectroscopy, X-ray diffraction (XRD) and scanning electron microscopy (SEM). Consequ…
A basic technique for manufacturing and processing polycrystalline diamond as a promising material for heatsinks of high-power microwave semiconductor devices is proposed. The fabrication of polycrystalline diamond wafers by chemical vapor deposition is investigated. The choice of a method for fragmenting polycrystall…
The space industry requires strong lightweight alloys to decrease launching costs and to increase the reliability of components. One promising technique is the application of ultrasound to a solidifying melt, which has been demonstrated to enhance the thermo-physical qualities of the treated sample through grain refin…
There are more and more converter transformers, bushings, smoothing reactors use epoxy resin or epoxy/insulating paper composite materials as the main insulating medium, in the UHVDC transmission projects. In practice, there are many interfaces between epoxy and insulating paper exist in paper/paper insulation system.…
Polyethylene is often used as insulation in HVDC cables. In order to reduce charge injection and thus increase cable time life, various interface barriers, such as fluorination, or bulk barriers, such as nano-filler compounds, can be used to modify the material properties at the atomic scale. At the atomic scale, the…
A new experimental test bed has been designed, built, and tested to evaluate the effect of the system’s parameters on a reciprocating Active Magnetic Regenerator (AMR) near room temperature. Bulk gadolinium was used as the refrigerant, silicon oil as the heat transfer medium, and a magnetic field of 1.3 T was cycled.…
The electric field distribution within a cable joint can be strongly distorted due to its complicated structure, which possibly leads to interface discharge between the primary insulation of cable and the insulation of cable joint. Polypropylene (PP) with excellent electrical performance is considered as a promising m…
The heat capacity of band magnets Fe2 MeAl (Me = Ti, V, Cr, Mn, Fe, Co, Ni) ordered in crystal structure L21 has been measured in the range 2 K ≤ T ≤ 50 K. The dependences of the Debye temperature ΘD, the Sommerfeld coefficient γ, and the temperature-independent contribution to heat capacity C 0 on the number of valen…
The polarized Raman spectra of SrB4O7 (SBO) single crystals are studied in detail in the temperature range of 300–1273 K. The TO, LO, and IO phonon lines of A 1, A 2, B 1, and B 2 symmetries of rhombic SBO at 300 K are identified. The behavior of the Raman spectra of SBO crystals is studied upon heating up to their me…
A method has been proposed for studying the reorientation dynamics of the nematic liquid crystal (NLC) director using the results of measurements of the electric response of an LC cell. The simulation of the time dependences of the current in an LC cell with a homogeneous orientation is carried out upon variation of t…
Growth and structural properties of thin a-C films prepared by the 60 MHz very-high-frequency (VHF) magnetron sputtering were investigated. The energy and flux of ions impinging the substrate were also analyzed. It is found that the thin a-C films prepared by the 60 MHz sputtering have a lower growth rate, a smooth su…
It was found in this study, that radiation crosslinking has a positive effect on the mechanical properties of selected type polyamide. In recent years, there have been increasing requirements for quality and cost effectiveness of manufactured products in all areas of industrial production. These requirements are best…
A consistency between the Darken method and the Onsager representation for cross diffusion in multicomponent system is shown. The justification is made by defining new sets of forces and fluxes linearly interrelated by a symmetric matrix of phenomenological coefficients. For the first time, the system of the component…
In Textile industry, production is mostly key concern for Industry owner. This always has attracted researchers and machines manufacturers to make new developments in process and machines. Air-jet is one of the leading and successful highest productive weaving machines. However, it is now well established that due to…
Yimo Han, Saien Xie, Benjamin Savitzky, Robert Hovden, Hui Gao, Lena F Kourkoutis, Jiwoong Park, David A Muller; Strain Accommodation and Coherency in Late