Materials Literature
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In this paper, a theoretical analysis of an axial magnetic coupling is presented, leading to a simple expression of the electromagnetic torque. This expression is obtained by using a two-dimensional (2-D) approximation of the magnetic coupling geometry (mean radius model). The analytical model is based on boundary val…
The effort to simulate the nitriding process has been ongoing for the last 20 years. Most of the work has been done to simulate the nitriding process of pure iron. In the present work, the compound layer growth model has been developed to simulate the nitriding process of AISI 4140 steel. In this paper, the fundamenta…
The band offsets for a Zn 1− x in Mg x in Se/Zn 1− x out Mg x out Se quantum well heterostructure are determined using the model solid theory. The heavy hole exciton binding energies are investigated with various Mg alloy contents. The effect of mismatch between the dielectric constants between the well and the barrie…
This work presents experimental results on the effect of a flow of atomic hydrogen on the quality of vacuum insulation with electrodes made of stainless steel and copper. Electrodes with the class of roughness 1.6, and electrodes, the surface of which previously was polished by means of the electron beam, were tested…
A crystal plasticity finite element method (CPFEM) model has been developed to study the texture evolution of Al single crystal pressed through a bent channel with equal cross-section for the first time. The equivalent strain rate distribution in the billet shows two major plastic deformation zones at the entry and ex…
Samples of natural and acid-modified basalt tuff and also of the Pd(II)-Cu(II)/N-BT catalyst were characterized by the methods of thermogravimetry and water vapor adsorption. It was shown that at the water contents in the samples of the catalyst from 1.6 up to 7.2 wt % their activity in the reaction of low-temperature…
Single event upset (SEU) is mainly caused by neutrons in the terrestrial environment. In addition, SEU effects become more and more problematic as technology scales. It is, therefore, important to understand the SEU behaviors of semiconductor devices under neutron reactions. ANITA (atmospheric-like neutrons from thick…
SiO2hollow spheres and K-SiO2insulation paper handsheets composed of these SiO2hollow spheres with different weight percentages were synthesized. SiO2hollow spheres with a low content were uniformly dispersed. However, the SiO2hollow spheres locally aggregated with increased concentration. The relative permittivities…
In many ways, the Smart Grid represents the next big thing. It encompasses not only the public electricity network but potentially all things that connect to the network. Changes in the network and changes in equipment connected to it are intertwined, and along the way unintended consequences may happen. One of those…
"On the use of Hopkinson bar-bending apparatus to study soft impact on porcine ribs." Computer Methods in Biomechanics and Biomedical Engineering, 15(sup1), pp. 311–312
This paper presents a generic Magnetic Equivalent Circuit model applied to a flux focusing permanent magnet synchronous machine. The proposed model is based on a 2D reluctance mesh, where the circumferential reluctances number can be modified automatically. So, the designer can choose to increase precision or decrease…
The value of an indentation load on the Vickers indenter in measuring hardness of composite superhard materials has been substantiated. It has been shown that in hardness testing a 5N-load provides optimal chances for precise measuring the indent without damages around it.
Using the poly-acrylic acid ester modified porous silica as fillers, the E-44 epoxy resin as matrix, ethylene diamine as curing agent prepared the sound absorption coating, and the sound absorption properties of and wear resistance were tested. The results showed that: the coating wear resistance increased with the ad…
External insulation strength assessment of contaminated insulator is proposed in this paper using the acoustic emission signals generated when the polluted insulator flashover discharges. Systematic artificial contamination experiments were done. The acoustic emission signals generated from the polluted insulator were…
Polarized absorption and dielectric spectra of poly (N-carbazole) (PVK) blend with poly(vinylidene fluoride-co-hexafluoropropene) (PVDF-HFP) and polyvinylpyrrolidone (PVP) in the same composition ratio were investigated. Polymer coating was carried out using doctor blade technique on a glass substrate. In order to inv…
The statistical data show lightning strike is the major cause of the floating oil tanks ignition and the actual tank stroke-ignition process is still not completely known. The effects of direct lightning stroke on floating oil tank have been studied a lot in previous works and there is little research on the influence…
This paper presents the development and experimental verification of a high-speed permanent magnet motor simulation model. The used motor has maximal speed 42000 RPM, nominal speed 25000 RPM, nominal torque 1,2 Nm and nominal current 11 A. The verification is based on the motor start-up and spin down measurement. Spec…
Using the quantum chemical method PBE0/cc-pVTZ, we determined structural parameters and dipole moments of bullvalene (tricyclo[3.3.2.0 4.6 ]deca-2,7,9-triene), 1-, 2-, 3-, and 4-hydroxytricyclo[3.3.2.0 4.6 ]-deca-2,7,9-trienes, and isomeric 2- and 3-ketones transforming into each other through the keto-enol tautomeris…
Impulse voltage tests are essential to inspect and test insulation integrity of high voltage apparatus. On the other hand, generated impulse currents are used for different test applications such as investigation of high current effects, electromagnetic interference (EMI) testing, etc. Obtained voltage and current wav…
Abstract Summary: In this study it is presented the synthesis and the characterization of Fluorescent‐Magnetic Nanostructures based on polymer‐quantum dots conjugates. Polyvinyl alcohol (PVA) was used as the capping‐ligand for the preparation of CdxMn1‐xS semiconductor nanocrystals via aqueous colloidal chemistry. Dif…