Materials Literature
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The preparation history of Al2O3 strongly determines its properties for the application as a catalyst support. The interaction of calcination heating rate and temperature and its influence on the structural, textural, and acidic properties of alumina were studied. Commercial-alumina was calcined at 800C, 900C, 1000…
Increasingly growing trend towards usage of green and eco friendly electrical devices has lead to research development in Brushless DC (BLDC) motors. The BLDC motors exhibit better performance in terms of higher efficiency, higher torque under low speed range, higher power density, lower maintenance and lesser noise t…
A procedure is proposed for an analysis of the data on the decomposition of inorganic carbonates (MgCO3, CaCO3, SrCO3, MnCO3, CoCO3) on the basis of results of thermogravimetric studies. The activation energy and the rate constant for carbonate decomposition are calculated taking into account the main points of the he…
Three copper triarylcorroles containing a [Formula: see text]-pyrrole nitro substituent were synthesized and characterized as to their spectral and electrochemical properties in nonaqueous media. The examined compounds are represented as [Formula: see text]-NO2(YPh)3CorCu, where Cor is the trianion of a triphenylcorro…
Bimetallic Co–Cu polyaniline composites were produced by oxidative polymerization of aniline, with ammonium peroxydisulfate and hydrogen peroxide as oxidizing agents. Co(II) and Cu(II) chlorides were introduced into the polymer by the in situ method. It was found that the phase constitution of the composites is affect…
The paper presents a theoretical view of the discrete-analytical method to solving a heat conduction transfer problem. For variation formulation of the process is a functional on the scalar function of temperature u under given boundary conditions was used. Discrete-analytical method, allows us to turn out the mathema…
Partial discharge (PD) measurement as a non-destructive diagnostic tool is a proven technique that has served in both design improvement and condition monitoring of insulation systems. An understanding and interpretation of the physical phenomena and influencing parameters of PD in AC systems have been established thr…
Partial discharge location can find insulation defects to avoid insulation deterioration and dielectric breakdown. Most of current PD location is implemented based on TDOA principle and the location accuracy is improved through multiple measurements. In this article, a novel location method is proposed using Monte-Car…
The aim of this study was to investigate the difference in the pulse sequence analysis (PSA) plots of partial discharge (PD) data obtained from electrode-bound voids and electrical trees in epoxy resin samples. Electrical discharge tests were performed on a set of epoxy resin samples containing needle voids, which wer…
The stator motor windings of low voltage rotating electrical machines are usually insulated by organic enamel. When the motors are supplied by power electronic converters, the stator insulation system is subjected to pulsed voltage waveform and a fast degradation of the insulating system could occur. In fact, it is po…
Self-healing materials (SHMs) are capable of autonomously repairing minor damages, thereby restoring the pre-damage characteristics of the material. Such materials are of great interest for high-voltage assets, particularly those that are difficult or prohibitively expensive to access such as underground or subsea cab…
Due to the growing use of high-voltage direct current (HVDC) for power transmission, it is of interest whether the diagnostic tools introduced in the past for insulation condition assessment of high-voltage alternating current (HVAC) apparatus are also applicable for quality assurance tests of HVDC equipment. This ref…
The goal of the present paper is to apply control techniques to determine the Blake cavitation threshold for adiabatic bubbles. Considering state space representation of Rayleigh-Plesset (RP) equation, a stability condition is derived to predict the threshold for cavitation which was determined beforehand by mechanica…
Dimethyl methylphosphonate (DMMP) has been used as a flame retardant containing phosphorus to decrease the flammability of the polyurethane foam material (PUF). Flame retardancy and thermal degradation of PUF samples have been investigated by the LOI tests and thermal analysis. The results show that LOI values of all…
This work reports evidence of the synthesis of zeolite A at two different temperatures (60 °C and 105 °C) from kaolin. XRD spectral analysis revealed percent crystallinity of 74 ± 2 and 71 ± 3 in LTA60 and LTA105 respectively. The average crystallize size of LTA60 and LTA105 was also estimated using Scherrer’s equatio…
The method of impedance spectroscopy is used to study the electrochemical behavior of (H 2 + H 2 O + Ar), Pt|La 0.9 Sr 0.1 ScO 3–δ system depending on the temperature (500–700°C) and gas phase composition in the range of hydrogen gas pressures of–1.3 < log( p H 2 ) <–0.01 and water vapor gas pressures of–1.3 < log( p…
The structure and transport and diffusion properties of film matrices based on polyamide and polyhydroxybutyrate blends obtained from solutions and melts are studied. Quantitative analysis of the diffusion and sorption of water shows that the dependence of the diffusion mobility of water increases exponentially with i…
Zur Reduzierung des Verzugs und der Zugeigenspannung in Schweißnähten an Kohlenstoff‐Mangan‐Stählen wurden Low‐Transformation‐Temperature Werkstoffe (LTT) konzipiert. Sie bedienen sich des Volumenexpansionseffekts während einer martensitischen Umwandlung, diese Volumenexpansion wirkt der Volumenschrumpfung während der…
A synapse-emulating electronic device based on organometal halide perovskite thin films is described by T.-W. Lee and co-workers on page 5916. The device successfully emulates important characteristics of a biological synapse. This work extends the application of organometal halide perovskites to bioinspired electroni…
The results of experiments on studying the perlite–ferrite structure in steels under short-term negative pressures are described. It is shown that in the localized deformation bands formed in the zone of interference of unloading waves, where the tension stress is lower than the dynamic strength of the material, the c…