Materials Literature
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Abstract In stainless steels, microstructural damage is caused by precipitation of chromium carbides or sigma phase. These microconstituents are detrimental in stainless steel welds because they lead to weld decay. Nevertheless, they are prone to appear in the heat affected zone (HAZ) microstructure of stainless steel…
This paper presents one of the methods for estimation of the electromagnetic excitation force of the motor. In order to identify the excitation force of the motor, vibration data was obtained using phase reference spectrum to overcome a number of channels of the DAQ instrument. FE model of the 200kW motor was made to…
This paper investigates the effect of rotating eccentricity fault on a 10/12 Flux Switching Permanent Magnet (FSPM) machine. Main characteristics of the studied machine such as air-gap flux density, magnetic force between rotor and stator and torque profile are calculated by using finite element analysis (FEA) which i…
In this paper, we present a recessed-gate normally-off Al2O3/AlN/GaN MISFET with stable threshold voltage based on selective area growth (SAG) of AlGaN/GaN heterostructure on AlN/GaN/Si template. By in-situ growth of a thin AlN space layer (SL) in MOCVD, GaOxcan be blocked fundamentally and a high-quality Al2O3/AlN/Ga…
Coaxial magnetic gears with permanent magnets have a very simple structure and performance comparable to that of mechanical gears. The paper describes an analytical simplified approach for the analysis and design procedure. The mathematical model is one-dimensional: only the variation of electromagnetic quantities as…
This article presents the experience of partial discharges monitoring inside high voltage oil power transformers under operation obtained in two last years. The presence of partial discharges inside paper insulation is one of the crucial phenomena in high voltage transformers influencing their lifetime. The applied ul…
In this paper, average modeling of a dual-supercapacitor bank, actively balanced by a bidirectional buck-boost converter is presented. In such a system, natural balancing is achieved when the converter is operated in open loop with 50% duty cycle, eliminating the need for measuring the voltage of each storage device.…
This paper demonstrates the impact of exposing undoped ZnO films to the air. Lateral resistance of ZnO films annealed in O2ambient increases with the time spent and then decreases at over one hundreds hours, while that of ZnO films annealed in N2ambient is almost insensitive to such exposure.
We propose a technique to build artificial anisotropic dielectrics by using periodic insertions of a homogeneous material in a homogeneous substrate, characterized by a different dielectric constant. We calculate the effective dielectric constants corresponding to the three principal directions by means of dispersion…
An optical quantum magnetometer with submicron spatial resolution is proposed that is based on the phenomenon of optical response in a solid-state spin system under conditions of spin sublevel anticrossing without using a resonance frequency. The system operation is demonstrated by example of spin defects in silicon c…
Layered CdTe nanoparticles were deposited on surfaces of n-on-p crystalline Si solar cells. Their short-circuit current and conversion efficiency were enhanced due to the nanoparticle deposition. Measurements of reflectance and external-quantum-efficiency spectra as well as atomic-force-microscope observations implied…
In this paper, a photonic crystal waveguide with point defects and lattice constant perturbations of +5%, -5% are being investigated. Firstly waveguide structures with constant and specific parameters are being studied and photonic band gap diagrams for TE/TM modes are depicted; then pulse propagation in the frequenci…
This paper is aimed to the research of the thorium purification processes at monazite refinement processes. We have investigated different solution containing thorium with different mix of rare-earth elements. It was found that the application of cation resin is well- recommended if we want to reach the highest yields…
The radionuclide composition and the activity level of the irradiated zirconium alloy E110, the radionuclide immobilization strength and the retention properties of the mixed clay barrier material with respect to the radionuclides identified in the alloy were investigated to perform the safety assessment of handling s…
Side reactions in the course of esterification of methacrylic acid with triethyleneglycol methyl ether in the presence of homogeneous acid catalyst have been studied. Chromato-mass spectrometry and authentic synthesis have revealed the chemical structure of the products; pathways of their formation have been suggested.
Resumen Los aceros API X70 son aplicados en fabricación y construcción de tuberías para el transporte de hidrocarburos, sin embargo, a un lapso de tiempo se degradan debido al medio ambiente al cual están expuestos; influyendo en la velocidad y tipo de corrosión sobre las superficies del metal base (MB), zona afectada…
High-speed machines are gaining interest, especially in traction applications because of their ability to produce high power density with a reduced size. Flux-switching permanent magnet (FSPM) machines are ideal for such applications since they have a simple rotor structure that can operate at very high speeds and uti…
Generalization of experimental results and mathematical models of the effect of ultra-high-frequency (UHF) electromagnetic radiation on details fabricated from energetic polymer materials are presented. Different types of phenomena in irradiated details are dependent on the size of the detail, free path radiation leng…
Transverse thermoelectric effect is a thermal to electric energy conversion, where the direction of electric field is perpendicular to the direction of heat flow. This phenomenon makes it possible to decouple thermal and electric current paths and provides design flexibility of thermoelectric devices. This paper descr…
Using thermal desorption time-of-flight mass spectrometry and thermionic methods, it is shown that oxygen does not intercalate under a graphene monolayer grown correctly on iridium, at least at temperatures of T = 300–400 K and exposures below 12000 L. However, if the graphene film on iridium is preliminary intercalat…