Materials Literature
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This paper presents an improved direct torque control (DTC) method for permanent magnet synchronous motors. The proposed DTC method generates the diver signal with SVPWM for the fixed switching frequency and low torque ripple relative to conventional hysteresis controllers. Different with the popular SVM-DTC, the prop…
Performance of simultaneous desulfurization and denitrification from N2-NO-SO2simulated flue gas using sodium chlorite as the additive and urea as the reductant in a rotating packed bed was investigated. In RPB, various rotational speeds, the flow rates of SO2, the flow rates of NO and the liquid flow rates were studi…
A comparative study of the viscoelastic properties of melts of vinyl acetate-vinyl alcohol copolymers with equimolar compositions characterized by different statistical distributions of chain units has been performed. It has been shown that the principle of temperature-frequency superposition is obeyed by copolymers c…
Aluminum silicate/SiO2 sol composites are prepared by aluminum silicate fiber mats impregnated with different amount of silica sol. The effect of different impregnation process on impregnation amount of composites are compared, Thermal insulation performance and compression strength of composites are tested in this pa…
A spin coated LaB6 discontinuous film is covered on MgO protective layer to improve the discharge performance of alternating current plasma display panels. Under the premise of high transmittance of more than 90%, a very small amount of polycrystal LaB6 powders added in an organic solvent are chosen as the coating sol…
The statistical model of treatment of a polyurethane nanocomposite by low-energy ionic streams in RF plasma at pressure in the range 13.3–133 Pa is developed. The dependence of the permeability of a filled nanocomposite on the filler mass fraction, both before and after RF plasma treatment, is theoretically investigat…
A new approach to analysis of the phase diagrams of splitting systems is suggested. The approach is based on a graph theoretical examination of the topological structure of phase separation diagrams. The possible quaternary splitting systems have been analyzed using the new approach.
Using the PAW DFT-GGA method and numerical solving of master equation the diffusion rates of lithium atoms inside both crystal and amorphous silicon of LixSi (x= 0..0.5) composition have been calculated for different temperatures. It is shown the diffusion rate for amorphous silicon is ~10 times greater than that for…
Direct Torque Controlled Permanent Magnet Synchronous Motor (DTCPMSM) has become popular because of its high speed, accuracy and absence of coordinate transformation. In DTC technique, the torque and flux are directly controlled by selecting the optimum voltage vector. But the conventional DTC method has some disadvan…
This study uses a single screw extruder to make short coir (SC), an agricultural waste, high-strength short glass fiber (SGF), and polypropylene (PP) into pellets, which are then made into wood plastic composites (WPC) on an injection machine. During the process, maleic anhydride grafted polypropylene (PP-g-MA) is use…
Measurements of ion conductivity have been made for four nickel solutions used in metal finishing processes but not all commonly for electroplating: chloride, nitrate, acetate and nickel methanesulphonic acid (MSA). Using criteria such as conductivity and Arrhenius plots to compare them with sulphate, chloride and ace…
Spontaneous generation of the electrical voltage in a Pr0.6Ca0.4MnO3 single crystal has been found. The charge and orbital ordering in the crystal takes place at T CO = 240 K, while the antiferromagnetic ordering occurs at T N = 174 K. As the temperature lowers, spontaneous voltage U increases initially slowly (in the…
The L10ordered FePt-based medium with a novel thermal design for heat-assisted magnetic recording (HAMR) application has been demonstrated. The proposed seed-then-heat sink approach using the (001) textured Cu3N as the underlayer to induce the MgO (200) texture at room temperature. The high temperature process for FeP…
To help machine designers to make precise design of large permanent magnet (PM) machines, this paper presents a set of design considerations that are very often ignored by machine designers. These considerations are categorized into several aspects: electromagnetic (EM) performance, losses and efficiency, fault and st…
The development of new nano-biocomposites has been one of the main research areas of interest in polymer science in recent years, since they can combine the intrinsic biodegradable nature of matrices with the ability to modify their properties by the addition of selected nano-reinforcements. In this work, the addition…
Abstract The research presented in this paper concerns BaBi2Nb2O9 (BBN) which is the member of the Aurivillius family and seems to be interesting from the point of view of its potential applications in storage media. Our investigations focused on temperature dependence crystal structure and mechanical properties of th…
The influence of the electrode metal structure and the current blocking layer on the characteristics of blue GaN-based light-emitting diodes (LEDs) was investigated. The changes in the electrode metal structure, along with the current blocking layer (CBL) were found to enable control of the optical and the electrical…
Changes in the atomic structure and surface morphology of a recrystallized molybdenum foil under the action of uniaxial tension in ultrahigh vacuum have been studied by low -energy electron diffraction (LEED) and atomic-force microscopy (AFM). It is established that uniaxial tension of the foil surface, which consists…
We have synthesized heterometallic complexes based on a copolymer of acrylic acid with butyl methacrylate (BMAC) with a composition [Eu x Bi(1 − x)-BMAC]. These complexes have several emission bands in the visible range. At room temperature, in complexes with a content of Eu(III) of 30–40%, intense white luminescence…
Current paper concentrates on the wear resistance of a particle reinforced polymer matrix composite material. The composite material consists of unsaturated polyester resin that is filled with aluminum hydroxide. Aluminum hydroxide acts as hard phase and polyester as binding agent. The aim of the work was to understan…