Materials Literature
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This paper presents a new theory to improve and assess the quality of electrical power. The theory is based on the tensor product between voltage vectors and n-phase currents. This new definition allows the estimate of reference currents for the control of active power filters “APFs” in multiphase systems and also det…
The paper presents the results of few numerical applications for sustaining the idea of unbalancing transversal capacitive compensation like a method for balancing the load of the electrical distribution networks and consequently to increase the voltage quality and the efficiency. The load balancing, analytical descri…
The domain-wall dynamics in the ferrite garnet films with the (111) orientation has been investigated by twofold high-speed digital photography in the presence of a magnetic field close in strength to the anisotropy field.
Electric AC arc furnaces used in steelmaking are nonlinear loads of large power. Due to chaotic nature of the electric arc and the melting process, such devices cause significant power quality problems in a supply network, mainly harmonics, inter-harmonics, unbalance, voltage dips and flickers. Limitation of this nega…
A stator turn fault in a symmetrical three-phase machine cause a large circulating current to flow and subsequently generated excessive heat in shorted turns, generate irregular control current of the three phase leads to demagnetization. The demagnetization of PM occurred distortion of air-gap magnetic flux distribut…
The transverse flux machine with a permanent magnet excited rotor is one of the most important machine topology for the application with electric driven vehicles. In particular with wheel hub drive systems, a machine design with an external rotor is favourably against an internal rotor. The paper discusses 3D finite e…
This paper investigates the cogging torque and torque ripple features of a permanent magnet flux switching (PMFS) integrated-starter-generator (ISG). The effects of the rotor pole arc width on cogging torque, torque ripple and output torque are first established using finite element analysis (FEA). Three torque ripple…
Based on the effective mass approximation, the ground-state donor binding energy of impurity located at the surface of the zinc-blende (ZB) GaN/AlGaN symmetric coupled quantum dots (SCQDs) is investigated variationally, considering the combined effects of the electric field to the right (along the growth direction) an…
We present an experimental study of the electron and hole charging and discharging processes in the direct tunneling regime of Ge nanocrystals (NCs) embedded in the SiO2 of metal/oxide/semiconductor transistors. A specific aim was to verify theoretical predictions of very long hole retention times for Ge NCs embedded…
Hysteretic magnetic properties and longitudinal magnetostriction of planar specimens of air-hardened 45 steel were measured as functions of elastic tensile stresses along and perpendicular to the applied loading using a closed magnetic circuit and attachable transducers. Parameters that exhibit monotonic variations wi…
Switched reluctance machines (SRMs) are usually excited by unipolar current by employing asymmetric bridge inverters. It is also possible to excite SRMs by bipolar current using a three-phase bridge inverter. The main objective of this paper is to derive general analytical expression of average torque in SRMs under bo…
Reliability issues of IGBT power inverters for multi-kilowatt traction motor drivers are investigated. Due to high power loss densities and different material properties any operation of the switching module is connected to internal stress. These forces are known as main causes of thermo mechanical fatigue. For lifeti…
In this paper, a novel control strategy based on combination of the Flatness based Control Technique (FCT) and the Fuzzy Logic Control (FLC) is developed and investigated to control an Electrical Hybrid Power Source (EHPS). The main property of this strategy is that the system power flow in different operating modes i…
Most used polymers show a visco-elastic behaviour. The significant change of the material properties is a function of time and temperature, and needs to be taken into consideration. When exposed to humid environments, epoxy resins can absorb water up to a 10 weight -%, depending on the chemical nature and structure, s…
Abstract The method of calculations of a thick plate on the two-parameter layered foundation by the finite element method is presented. The numerical model allows to add a few (number of) foundation layers. The expressions for the element stiffness matrices of the foundation are based on 18-node zero-thickness interfa…
A compact Si-nanowire-based reflective arrayed-waveguide grating (AWG) for dense wavelength-division multiplexing is proposed. At the end of each waveguide in the array, there is an individual photonic crystal (PhC) reflector, which makes the AWG layout design very flexible. All the PhC reflectors are with the same de…
The utility of natural dyes (chlorophyll, protoporphyrin, and their derivatives) as ecologically pure new-generation dyes that are safer than common synthetic arene-based dyes is discussed. New dyes were obtained from chlorophyll and protoporphyrin derivatives such as pheophorbide (a+b), chlorin e 6 , 6-N-(2-aminoethy…
Vector Control with Optimal Torque of a Salient-Pole Double Star Synchronous Machine Supplied by Three-Level Inverters This work relates to the study of the vector control of the salient-pole double star synchronous machine drive (DSSM) fed by three-level inverters which are controlled by PWM hysteresis strategy. Inde…
We have discovered that massive samples of solid zirconium (Zr)s are completely oxidized by supercritical water (SCW, T > 647 K, P > 22.1 MPa) with the formation of zirconium oxide nanoparticles (ZrO2) n . The particle size distribution, morphology, and features of the nanostructure formation depend on the process con…
The use of a biotrickling filter was investigated for a pilot field-scale elimination of NH 3 gas and other odorous gases from a composting plant in Tongzhou District, Beijing. The inlet gas flow rate was 3500 m 3 /h and NH 3 concentration fluctuated between 2.76–27.84 mg/m 3 , while the average outlet concentration w…