Materials Literature
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Continuous carbon fibre reinforced silicon carbide (C/SiC) composites were fabricated by precursor infiltration and pyrolysis (PIP) process, a mullite/yttrium silicate multilayer coating was prepared by plasma spray method as the oxidation protective coating. The efficiency of the coating against oxidation was charact…
In case of medium voltage cables, the main cause of the insulation breakdown is water treeing by referring to the report of national power utility of Malaysia, Tenaga Nasional Berhad (TNB). The inconsistent and unreliable nature brings out the importance of research towards water tree detection of polymeric insulating…
Investigation of precipitation eects in solution treated MgTb and MgTbNd alloy was performed. Solution treated alloys were compared with samples deformed by high pressure torsion to examine inuence of deformation on precipitation eects. Dislocations present in samples processed by high pressure torsion can serve as di…
Abstract This paper presents the results of microstructure and magnetic properties analysis for bulk amorphous samples of Fe36Co36B19Si5Nb4 alloy in the form of rods of 1 mm, 2 mm, and 3 mm diameters in the as-cast state, produced using the method of injecting liquid alloy into cooled copper mold. The main purpose of…
Les réacteurs de fusion imposeront aux matériaux situés face au plasma de forts flux de neutrons rapides, ainsi que des flux thermiques et des températures très élevés. Seuls des matériaux de structure cristalline adéquate, dont la composition chimique et la microstructure auront été conçues à dessein, pourront résist…
An approach of harmonics component analysis, portraying the presence of certain amount of harmonics at the inverter output terminal, has been indicated in this paper. Some unwanted impacts are caused by the harmonics such as unbalance and excessive neutral currents, interference in nearby communication networks and di…
Current harmonic filter is a unit connected in parallel with the load at the load itself which injects the total harmonic current demanded by the load, and thus preventing harmonic current going into the power system. This paper describes the basic design, control modeling and simulation of a single phase current harm…
Silver nanoparticles with continuous size distribution from 10 to 20 nm were incorporated into porous glass produced using solgel technique. Positron annihilation lifetime spectroscopy was used to compare obtained material with an undoped reference glass. The positron annihilation lifetime spectroscopy measurement wer…
Very Fast Transient Overvoltages (VFTOs) which are caused mostly due to disconnector operations in Gas Insulated substations (GIS) impose several problems on the insulation of the system and also to the connected high voltage equipment. Therefore, it is important to do a VFTO study in GIS. In this paper, VFTO for swit…
Ultrafast pump-optical probe spectroscopy was used to analyze carriers dynamics behavior in La0.7Sr0.3MnO3/YBa2Cu3O7 − δ/La0.7Sr0.3MnO3 heterostructure. Our results show the pump signal ΔR/R for higher laser power (such as 21 and 41 mW), below T c , first goes positive, then crosses zero and goes negative, before rela…
The feasibility of controlling the electronic properties of the semiconductor surface by varying conditions for its processing is considered. The study of electron transverse transport in heterostructures based on a (100)Si single crystal and a tunnel-thin film of hydrogenized amorphous silicon carbide shows that the…
Abstract The classic relationships concerning the harmonic content in the air gap field of three-phase machines are presented in form of series of rotating waves. The same approach is applied to modeling of permanent magnet motors with fractional phase windings. All main reasons of non-sinusoidal shape of flux density…
The synthesis and investigation of properties of N-[[bis(trimethylsilyl)amino](fluoro)boryl]-(trimethyl)-N-(trimethylsilyl)silanamine as a possible precursor for the preparation of SiB x C y N z films were carried out. The identity of the compound has been confirmed by elemental analysis, IR, and 1H NMR spectroscopy m…
In this study, glassy phase is formed by SiO2-K2O addition to serve as amorphous grain boundary transition layer. SiC (SiO2-K2O) / Cu composite material were prepared by two-step coating method and hot pressing sintered below 770°C, 30MPa for 1.5h, using α-SiC as main reinforced phase, SiO2-K2O as grain boundary and C…
Fabrication of the anodic metals nanorod, especially Ti (titanium) nanorod arrays (Ti‐NRAs), has attracted increasing attention in recent years. In this reported work, Ti‐NRAs were prepared by applying a constant current of 200 mA under different anodisation conditions. The field emission scanning electron microscopy…
Nanocomposites are becoming known as a class of materials that possess the capability to operate at high switching frequencies and handle high power levels. Understanding how their loss characteristics scale and thermal behaviors change as core geometries are altered is vital when designing for grid applications. This…
High hardness, high strength, high fracture toughness and low density are required for novel bulletproof materials. B4C/SiC composite ceramic is one of the most potential candidates. In this study, B4C/SiC composite ceramic was prepared by reaction sintering. The influence of B4C content, species and content of carbon…
The results of measurements of radiation energy for single-channel detection systems based on uncooled silicon planar detectors and spectrometric readout electronics, developed at the Kharkiv Institute of Physics and Technology National Scientific Center, are presented. Radiation sources of 55Fe, 241Am, 57Co, 137Cs, a…
The spectra of X-ray electrons emitted by a nonuniform layered target are calculated in the small-angle approximation using the discrete-coordinate method. The errors in the calculations based on the small-angle and transport approximations are determined.
To obtain low-Si/Al-ratio geopolymers and overcome the disadvantage of impure raw materials, amorphous Al2O3-SiO2 powder was first prepared using a sol-gel method in accordance with specially designed chemical compositions. The composition of the geopolymers was designed according to the NaA zeolite composition (Si/Al…