Materials Literature
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The problem of the influence of concentrated heat flux on the dielectric dissipation factor (DDF) of synthetic ester is presented in this article. Some industrial practice has shown that in the result of action of concentrated heat flux of high intensity on the synthetic ester, the dielectric dissipation factor of thi…
Two approaches for the numerical solution of the full-wave Maxwell's equations, based upon the finite element method and the method of moments, are here used for the computation of lightning induced voltages on overhead distribution power lines. The methods are well suited to consider both induced and conductive coupl…
In the switched reluctance motor with segmental rotor (SRMS) the magnetic saliency of the rotor is due to a series of magnetic segments, which allow the magnetic flux to flow on short loops. In this paper, the study of this kind of SRM is carried out, and comparisons with a conventional switched reluctance motor (CSRM…
This paper proposes a technique for the estimation of the electrical parameters of the equivalent circuit of LIMs, taking into consideration the end effects, and focuses on the application of an algorithm based on the minimization of a suitable cost function. It proposes also a set of tests to be made in order to esti…
The problem of excitation of a finite thin plate made from a metamaterial with the electrodynamic parameters ɛ r ≈ −1, μ r ≈ −1 and ɛ r ≈ −1, μ r = 1 by a point source is considered. Resonance phenomena in the near field of plates are found that are caused by the interaction of the formed surface waves. It is shown th…
Abstract Eine Blase auf der Oberfläche eines mit Wasser gefüllten Gefäßes erzeugt bei geeigneter Beleuchtung am Boden eine kreuzförmige Kaustik. Dieses schon Leonardo da Vinci bekannte Phänomen lässt sich dadurch erklären, dass sich an der Innen‐ und Außenseite der Blase ein Wassermeniskus ausbildet. Zudem deformiert…
Earlier and continuous detection of potential failure points within electrical control equipment can facilitate a more proactive and complete arc fault prevention system. When these new sensor systems are interconnected to predictive protection systems communicating with SCADA or PLC systems, on-line predictive monito…
The spin-transfer torque motion of magnetic domain walls (DWs) in a CoB/Ni-based nanowire driven by a low current density of (1.12±0.8) × 10 11 A m -2 has been observed indirectly by magnetotransport measurements. A high DW velocity of 85±4 m/s at zero field was measured at the threshold current density. Upon increasi…
The use of induction furnaces for steel production is increasing day by day. Induction furnaces produces power quality problem as result of their operation. This paper deals with modelling of induction furnaces in ETAP software with real data. Extent of power quality problem caused by the furnaces is identified. Elimi…
The primary standard for low voltage, random wound, induction motors in North American countries is National Electrical Manufacturers Association (NEMA) MG 1-2011. In some other countries, the governing standard is International Electrotechnical Commission (IEC) 60034-1:2010. This paper compares performance, design an…
Like in any high voltage asset, knowledge about the presence of partial discharge in the insulation system can provide vital information about the health condition of HV apparatuses. For switchgears, a traditional PD measurement according to IEC 60270 requires the disconnection of power cables from the switchgear, and…
The objective of this study was to develop anti‐washout and fast‐setting calcium–magnesium phosphate cement (as‐ CMP ) by introducing white dextrin ( WD ) and magnesium phosphate cement ( MPC ) to CPC . The results showed that WD imparted anti‐washout to the as‐ CMP paste, whereas MPC simultaneously improved the paste…
We have controlled the curvature of silicon microlens by changing the amount of photoresist in order to microfabricate hemispherical silicon microlens which can improve the directivity and reduce substrate mode losses.
Abstract The development of economy and industry introducing new technologies and materials often means the increased threat of occurrence of factors harmful to humans and environment. Workers employed in foundries as mould pourers are the group of high professional risk. Foundry moulding sands when poured with liquid…
We derive expressions to calculate the charge density along the tower and lightning channel based on the assumptions of the transmission line model of the lightning strikes to a tall tower and a series point current source placed at the tower top. These expressions are used to calculate the very close-range electric f…
The crystal lattice vibrational frequencies in the center of the Brillouin zone have been determined with the Raman spectroscopy method. The lattice vibrational frequencies, the phonon density of states, elastic and piezoelectric moduli, Born dynamic charges, and high-frequency dielectric constant have been calculated…
Percolative BaTiO3/multiwalled carbon nanotube (MWNT) composite thick films were developed using an aerosol deposition (AD) process at room temperature. Well-dispersed mixed powders with various volume ratios were utilized as the starting powders for AD, and dense BaTiO3/MWNT composite thick films were successfully fa…
The locally twisted cube is a newly introduced interconnection network for parallel computing, which possesses many desirable properties. In this paper, the problem of embedding complete binary trees into locally twisted cubes is studied.Let LTQn(V;E) denote the n-dimensional locally twisted cube.We find the following…
The loss from cans is the main problem for canned machines especially at high speed. In this paper, different strategies are used to reduce can loss of a canned switched reluctance machine (SRM). Based on an ordinary SRM, the improvements includes investigating the rate of change of phase current, axial separation of…
We present experimental results for performance of the 2D hypermesh NoC topology, realized with the Altera Family of FPGAs. Hypermeshes are based on the concept of hypergraphs, which consist of a set of nodes and a set of hyper-edges, where the hyper-edges represent low-latency distributed switches. In a 2D hypermesh,…