Materials Literature
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Mechanisms of the combustion of reagent mixtures that form complex oxide ferrimagnets (hexaferrites with M structure) are investigated. The phase composition of the end product is found, depending on technological conditions that include self-propagating high-temperature synthesis with preliminary mechanical activatio…
Causes for deposition of defective galvanized coating (lumpy deposition of coating during hot dip galvanizing) of carbon-steelwire have been investigated. It is established that the lumpy deposition is caused due to segregation of silicon on the surface of steel wire. Due to this change in composition of the steel at…
SrBi(4)Ti(4)O(15) (SBTi) and CaBi(4)Ti(4)O(15) (CBTi) dielectric films of bismuth layered-structure dielectrics (BLSD) are prepared on Pt(100) film for constructing stacked-type dielectric capacitors; it is observed that they are c-axis singleoriented crystalline films. Compared with the perovskite barium titanate fam…
Requirements for thermodynamic models for heating tests of asynchronous motors used in electric drives operating under intense heating conditions are discussed.
The ZnO thin films have been produced on p-type Si by the dip-coating method and after deposition were heated at different temperatures in the range from 650K to 850K. The photoluminescence (PL) and cathodoluminescence (CL) measurements were carried out at temperature range 12K-350K. I-V, C-V, Q-DLTS measurements were…
This paper presents the study of the transients for a multi-speed induction motor with toroidal stator winding and external rotor. The results prove the superiority of the toroidal winding for external rotor structures since it offers an easier way to change the coil ends connection in order to obtained more synchrono…
Time-resolved X-ray-induced photoluminescence (PL) of LaBr 3 :Ce scintillation spectrometer crystals excited by synchrotron radiation with photon energies within 45–290 eV has been studied at 7.5 and 295 K. It is established that the PL response is essentially nonproportional to the exciting photon energy in the regio…
Abstract This paper presents the reasons for the differences in interface tension and emulsion stability of Span60, Tween20, Tween60, Tween80 from the perspective of the molecular structure. For a surfactant emulsion, there is no complete correlation between interfacial tension and emulsion stability. Interface tensio…
A diffusion model of the development of concentration heterogeneities of a photopolymerizable composite that takes into account the transition of the monomer-polymer system from the homophase state to the heterophase state with an increase in conversion is proposed. Numerical simulation shows that a significant increa…
This paper proposes a multi domain physical model of permanent magnet synchronous machines, considering electrical, magnetic, thermal and mechanical effects. For each component of the model, the main wave as well as lower and higher harmonic wave components of the magnetic flux and the magnetic potential difference ma…
This paper presents a study of buried (i.e., interior) permanent-magnet (PM) synchronous machines (IPMSM) performances. Three IPMSM with distributed windings are designed and compared. They have identical: output power, stator and rotor outer diameter, air-gap, axial length, PMs volume.... Comparison of the back elect…
We experimentally demonstrate self-phase modulation based all-optical regeneration of a 40 Gbit/s serial data signal in a silicon nanowire. Bit error rate characterization shows 2 dB receiver power improvement.
We investigated the charge activity on alumina dielectrics in the development process of impulse surface discharge in vacuum. We clarified the charge activity in pre-discharge stage by ultra-high speed and high sensitivity measurement. We also measured the fast-framing images of surface flashover propagation synchrono…
The western part of the state of Rio Grande do Sul, in South Brazil, is characterized by high ground flash densities. In the period 2003-2011, lightning overvoltages accounted for about 47 % of the total number of distribution transformer failures observed in the service area of the power company AES Sul. This paper p…
A new algorithm for multiple partial discharge sources separation is proposed in this paper. ST is firstly employed to obtain the time-frequency representation of original PD pulses. Then, PD pulses similarity matrix is computed based on ST amplitude matrix. By using the pulses similarity matrix, affinity propagation…
In order to achieve 1~14μm infrared stealth, the forbidden band of photonic crystal (PC) must be broaden. In this paper, we systematically studied several parameters affect the forbidden bandwidth of PC, such as refractive index ratio, thickness and periodic number of two medium layers. Numeric calculation results sho…
Pure and Yb-doped Ca9Y(VO4)7(CYVO) single crystals were grown using the Czochralski method. Their crystal structure was determined using powder diffraction and the defect structure was characterized using high-resolution diffraction. The undoped crystal is found to be composed of a transparent and an opaque parts. In…
The subject matter of the paper focuses on evaluating the possible application of time-frequency analysis of vibroacoustic signals of transformers to assess the technical condition of their cores. The paper presents the results of the research related to development of a non-invasive diagnostic method for transformers…
A particular Cathode-like luminescence (CLL) phenomenon occurring on vacuum-dielectric interface under high DC electrical field before or accompanied with flashover is reported, which is widely existed in vacuum-dielectric system. It is considered that the CLL presented in this paper is initialized by field electron e…
Based on the corrected carbonation depth prediction model, this study develops a time-dependent structural reliability model to predict the probability of serviceability failure subject to carbonation-induced corrosion, using the latest time-dependent CO2 concentration data. Probabilistic methods are used significant…