Materials Literature
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Accumulation of interfacial charge creates local field distortion during insulation response measurement. Furthermore, such localized field enhancement affects the interaction between polar compounds present within oil-paper insulation and in turn affects its aging process. By getting sufficient trap energy (normally…
した金属酸化物薄膜を形成する技術をこれまでに培ってきた。 その中で特に注力したのが，固体基板上にこの多孔質薄膜を 形成する技術の確立である。Si 半導体基板やガラス基板上 に堆積したアルミニウム (Al) やチタン (Ti) の薄膜を電解液中 でアノード酸化することにより，数十 nm 間隔で酸化物ナノ チューブが基板に対して垂直に規則配列した金属酸化物薄膜 が自己組織的に形成できることを実証した 1) -3) 。図 1 上段は， Si 表面上に堆積した Al および Ti 金属薄膜をアノード酸化し
Abstract The actual load-bearing capacity of elements of a building system can be calculated by dynamic parameters, in particular by resonant frequency and compliance. The prerequisites for solving such a problem by the finite element method (FEM) are presented in the article. First, modern vibration tests demonstrate…
This paper proposes the constant switching frequency current control technique using carrier-based hysteresis modulation, for three-level inverter based Distribution Static Compensator (DSTATCOM). The proposed scheme ensures constant and reduced switching frequency operation of three-level voltage source inverter (VSI…
For last decades, the topic of polymer nanocomposites have been widely studied in the scientific literature since the material system promises a substantial dielectric properties enhancement even at low nanoparticles loading. Nevertheless, factors contributing to increased or decreased DC breakdown strength of nanocom…
In this article,the dissolution of Boric acid in different temperature conditions, with density functional theory (DFT) is studied. the Boric acid with chemical formula H3BO3 (sometimes written B(OH)3), and exists in the form of colorless crystals or a white powder that dissolves in water and produces Tetra hydroxy bo…
High electric field intensity in string isolators can trigger corona which results in premature aging of the insulator. One solution to overcome this problem is by installing the corona ring, the corona ring will uniform the electric field distribution of the insulator adjacent to the conductor. However, the dimension…
In recent years, quality evaluation of manufactured products By Non-Destructive Inspection (NDI) with X-ray has been attracting attention as this method analyzes the internal structure of manufactured products two-or three-dimensionally without destroying them. This inspection method has been used for various applicat…
Here, we show theoretically and numerically that gradient metasurfaces can be used for converting evanescent waves to propagating ones. This conversion is useful for far field subwavelength imaging, where information about subwavelength features of a target object is contained within the evanescent waves and can not b…
A phase-field-crystal (PFC) model is used to investigate the protrusion of blind TSVs under different strain states. The direction of loading applied to the TSVs has an effect on the protrusion, which is closely related to the copper grains and their orientations at the TSV edges. A nonlinear relation between protrusi…
Aiming at high forces at low space in linear direct drives, favorable heat transfer conditions and high copper filling factors of the coils are of central importance [1]. For this reasons coils are mainly made of round copper wire and subsequently casted with impregnating resins or epoxy resins to increase stability a…
This paper presents a wideband circularly-polarized slot array antenna based on metasurface. The proposed structure is a set of 2×2 array of CP-Metasurface with a feed network consists of a sequentially rotated transmission line. Each array of this structure is made up of 3×4 square patches with notched side, which pr…
We propose a method of calcium isotope sepration using a countercurrent plasma centrifuge with a hot wall, which separating the fractions by means of vapor deposition at the end faces of the device. The centrifugal force, providing the effect of radial separation, is excited due to acceleration of a weakly ionized cal…
Abstract The properties of surface layers can be formed by changing their structure using heat treatment and their composition and structure via the supply of an additional material to a treatment zone. The structural and phase transformations in the near-surface layer are determined by the thermal cycle in a treatmen…
In this research work poly(vinyl chloride)(PVC), ethylene vinyl acetate copolymer (EVA), and Maghnite nanoclay (MGT) were used to prepare PVC/EVA nanocomposites. The MGT clay was intercalated with octadecyltrimethylammonium chloride (ODTMA) and grafted with γ-aminopropyltriethoxysilane (APTES). The blend nanocomposite…
Abstract The dependences of the integral intensity and kinetics of mid-IR cathodoluminescence (CL) of Fe:ZnSe crystals on an iron concentration varying from 0.01 to 14 wt % are studied in the temperature range from 78 to 300 K. It is found that the maximum mid-IR CL intensity in Fe:ZnSe is observed at an Fe concentrat…
Abstract The results of electronic structure calculations of imperfect crystals—nonstoichiometric metal oxides (TiO2 – x, TiO1 – x, Al2O3 – x) are reviewed. All calculations were performed within the density functional theory in the coherent potential approximation with vacancies randomly distributed in metal and oxyg…
П.В. Сиротин, Б.Г. Гасанов
This paper reports for the first time a new kinetic model of thermal oxidation of Ge that considers both O-vacancy and atomic O diffusion as a function of O2pressure. The model is based on newly obtained results that Ge oxidation is described by kinetics completely different from the Deal-Grove model and that it exhib…
Schwarz-Christoffel conformal mapping method is widely used in modeling of air gap flux density distribution of electrical machines. It should not be as time consuming as definition and calculation of the finite element model but provides results with high accuracy. Also the improved saturation model can be applied to…