Materials Literature
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Physicochemical properties of the novel photosensitizer meso-tetraphenyl chlorin disulphonate (TPCS2a) and the chemically related meso-tetraphenyl porphyrin disulphonate (TPPS2a) were investigated in aqueous solutions as part of pharmaceutical preformulation. Inflection points were calculated to be 3.9 for both compou…
Trioctahedral micas from kamafugitic lavas of Presidente Olegario (Brazil) are Ti-Fe-bearing fluorophlogopites. They were investigated using a combination of electron probe microanalysis (EPMA), single-crystal X-ray diffraction (SCXRD), and Mössbauer spectroscopy. EPMA data yielded the following ranges: Al 2 O 3 (8.7-…
Due to the naturally high torque ripple and non-linear characteristics, the applications of Switched Reluctance Motors (SRM) drives are very limited. It is well known that the Torque Distribution Functions (TDFs) method is one of the most effective methods to reduce their torque ripple. This paper presents an analysis…
The presented thermal impedance spectroscopy of power modules simplifies significantly the failure analysis of power modules. It enables online observation of degradation within the cooling path with detailed information about failure mechanisms. The degradation of certain layer within the power module is detected by…
This paper focuses on influence of design parameters of permanent magnet machines with concentrated windings on cogging torque, torque ripple and mean torque. An efficient approach is presented to estimate the magnet width and slot opening width for minimizing cogging torque and/or maximizing mean torque. Two-dimensio…
This study presents a new torque ripple compensation for permanent magnet synchronous motors (PMSMs). The proposed method is based on instantaneous torque estimation by a mathematical model. The model is described in a new expression to estimate the torque with low volume offline data. The offline data is constructed…
The aim of the present work was to study the effect of flux, welding current, arc voltage, and travel speed on changes in microhardness and microstructure of the heat-affected zone (HAZ) and to optimize the process so that minimal changes occur in the material properties after completion of a submerged arc welding (SA…
Moisture absorption and hygroscopic swelling behavior of an underfill material were measured in-situ using the sorption TGA and the DMA-RH techniques, respectively. Results showed that moisture diffusion can be well described by Fick's law when the relative humidity (RH) is 60% or less, and the diffusivity exhibits an…
B.J. McParland New York, NY: Springer, 2010, 594 pages, $219 This is an interesting book of 17 chapters spanning 594 pages. After the introductory chapter, chapters 2–5 describe the theoretic bases from quantum theories and Dirac's equation to radioactive decay with respect to energies and half
ZrO2 nanoparticles were produced by high current electrical arc discharge of zirconium electrodes in deionized (DI) water. A mixture of nanocrystalline ZrO2 monoclinic and tetragonal phase form based on X-ray diffraction (XRD) analysis. Dynamic light scattering (DLS) result indicates that the size of the particles inc…
Topological invariants in terms of the Green’s function in momentum and real space determine properties of smooth textures within topological media. In space dimension d = 1 the topological invariant N 3 in terms of the Green’s function (ω, k x , x) determines the fermion number of the kink, while in space dimension d…
Photoreactions of 2,6-dimethyl-, 2,6-di- tert -butyl-, and 2,6-diphenyl-1,4-benzoquinones with alcohols, organic acids, thioalcohols, amines (primary, secondary, and tertiary), cyclic ethers, tri- and tetraethoxysilanes are accompanied by the effect of chemical polarization of nuclei (CINDP) and lead, along with the f…
The aim of this article is to study the internal stress evolution law of quenched specimens with complex phase transformation during the cooling process. The complex phase transformations were treated by analyzing the expansion coefficient evolution of steel 40Cr and the finite element method (FEM) was used to build t…
A direct comparison between two complete intensity datasets, collected on the same sample loaded in two identical diamond-anvil pressure cells equipped, respectively, with beryllium and diamond-backing plates was performed. The results clearly demonstrate that the use of diamond-backing plates significantly improves t…
The supercell Pd 16 H has been investigated in order to describe the hydrogen migration in the palladium lattice, where the hydrogen atom moves between symmetric interstitial sites. Ab initio calculations of the barriers for hydrogen diffusion in relaxed and unrelaxed metal lattices have been performed in the local de…
The market for electric motors in general machine applications and especially in electric driven vehicles has changed tremendously over the last years, as new materials and innovative electronics enable manufacturers to develop electric motors with highest energy densities in applications ranging from miniature up to…
The octenyl succinate starch is a stabilization-modified starch produced by esterification of native starch with octenyl succinic anhydride (OSA). When modified in this way the starch tends to improve its functional characteristics, can be used to tailor starch to specific food applications. Therefore, optimization of…
An effective mesa-isolation process using Cl-based gas chemistry and oxygen plasma post-treatment is investigated to minimize the effect of plasma-induced damage on AlGaN/GaN high-electron mobility transistor (HEMT) performance. Plasma-induced dc bias of the dry etching of AlGaN/GaN heterostructures is optimized using…
The process of the thermal oxidation of various carbon nanomaterials (multiwalled carbon nanotubes, carbon black, nanoporous carbon and graphite) used in the catalytic layers of electrochemical energy converters (electrolyzers, fuel cells) has been studied. The thermal stability of these materials has been determined.…
Abstract Summary: Poly[2‐(N,N‐dimethylamino)ethyl methacrylate] (PDMAEMA), copolymers of different compositions of styrene with 2‐(N,N‐dimethylamino)ethyl methacrylate (SDMAEMA) or methacrylic acid (SMA) were synthesized by free radical polymerization and characterized by several techniques. Different ternary mixtures…