Materials Literature
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This paper proposes a novel scheme based on current signature analysis to estimate the severity of dynamic eccentricity fault independent of saturation in salient-pole synchronous machines (SPSM). The detection technique uses short circuit test data and exploits the presence of inherent static eccentricity in a machin…
The photoluminescence of process-induced tensile strained nanostructures fabricated using Ge on Si is reported. 100 nm pillars were etched and embedded in a silicon nitride thin film demonstrating photoluminescence emission up to ~2.5 μm.
Research results of the weld chemical composition and mechanical properties at pulsed arc welding are discussed. It is established that the pulsed power supply favours mechanical properties of the welded joint.
Cutting tooth especially due to the poor quality of the shearer brazing, caused great pick consumption and delayed hours. The tooth body wear of the whole shearer picks accounts for half of its overall failure. In this experiment, the cutting pick jiont which was welded by induction brazing was strengthened by plasma…
Reactions of AgReO 4 and AgCH 3 SO 3 with L = 2-amino-4-methylpyrimidine (Ampym, C 5 H 7 N 3 ) in a ratio of 1: 2 in acetonitrile gave the complexes [AgL 2 (ReO 4 )] ( I ) and [AgL 2 (CH 3 SO 3 )] ( II ). Their structures were determined. The crystals of complex I are monoclinic, space group C 2/ c , a = 5.985(1), b =…
The action of laser radiation with wavelength = 10.6 µm causes substantial λ phase and structural changes in photosensitive glass as a consequence of the processes of induced crystallization and secondary amorphisation, which are reversible. Obtained polycrystalline phases were investigated by means of X-ray diffracto…
BACKGROUND: To determine the incidence of contrast-induced nephropathy (CIN) among diabetic patients treated with Metformin who underwent computerized tomography (CT) scan with iodinated contrast media. METHODS: Prospective study of diabetic patients enrolled in a lactic acidosis prevention protocol in whom clinical a…
Variants of the up-to-date composite engineering materials. A process of cutting plates production is suggested and consists in rotating of a mould around its figural axis with changeable angular speed while a powder is loaded layer-by-layer into a mould
We propose a new use of an RF-MEMS (radio frequency - micro electro mechanical systems) capacitive switch to construct a tunable terahertz filter. The built-in capacitor within a split-ring resonator is electrostatically actuated to shift the resonant frequency, providing a behavior as an ON/OFF switch for a particula…
This paper suggests an effective step-skew method to reduce the cogging torque of a surface-mounted permanent magnet synchronous motor (SPMSM). The main concept of the proposed method is to adjust each step length by considering the non-uniform air gap flux density distribution in the axial direction. The results show…
Automotive heat exchangers are manufactured using brazed thin aluminium tubes and are submitted to pressure pulses, thermal shocks and corrosion. Thermal shocks induce low cycle thermo-mechanical fatigue that leads to failure after several thousand cycles. We propose a thermo-mechanical fatigue design approach for aut…
Reduction in electrical energy consumption requires power utilities to employ most efficient ways of electrical energy delivery from generation to distribution infrastructures. For bulk power transfer over long distances improved transmission efficiency is a primary target to ensure less electrical energy losses and c…
Over the last several decades, HASL (hot air solder level) coating has been one of the most robust finishes. During the HASL process, the copper surfaces of bare boards are first cleaned and coated with flux, the boards continue to be dumped into a lead or lead-free solder pot and finally the extra solder is blew out.…
Dielectric Ceramics (DRs) have revolutionized the microwave wireless communication industry globally. The three key properties of ceramic dielectrics that determine their functionality at microwave and millimetrewave frequencies include relative permittivity (εr), unloaded quality factor Qu - the inverse of the dielec…
Warm dense matter (WDM) is a state of a substance with a solid-state density and temperature from 1 to 100 eV. Researchers believe that such a state exists in the cores of giant planets. Investigation of WDM is important for some applications, such as surface treatment on the nanometer scale, laser ablation, and the f…
The elastic–plastic fracture mechanics parameter J and its analogous creep fracture parameter C* are widely used to measure the fracture resistance of a material. The non-linear component of the J and C* parameters can be evaluated experimentally using the η factor. For weldments, the η factor is dependent on the rela…
Thermally stressed high-density multi-tier copper wire bonded IC packages are the most challenging tasks in IC package decapsulation. For acid decapsulation, the hardening of epoxy in molding compound after stress tests requires much longer etching duration. As a result, copper bond wires suffer severe corrosion damag…
We have investigated the influence of a stray field on a magnetic domain wall (DW). The depinning fields of a DW in a perpendicularly magnetized Co/Ni nanowire with partly-stacked Ni 81 Fe 19 /SiO 2 islands on it was measured. The depinning field for the wire with Ni 81 Fe 19 /SiO 2 was found to be higher than that fo…
The kinetics which explained the Copper Super-filling by electrodepostition was investigated since the copper deposition became the standard technique for TSV. A simple numerical model is built to explain the copper deposition process. Consider with the effect of the accelerator, a linear equation is built to explain…
Geopolymer cements present a unique opportunity to make concrete binders almost entirely out of waste stream materials. Geopolymers made from fly ash, a waste product of coal power generation, as the aluminosilicate source and caustic activating solution were the focus of this study. However, the use of waste stream m…