Materials Literature
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In Iron Core Motors, there are two types of ripple - i.e. position dependent, current dependent parasitic forces. One is only marginally dependent on current (the detent force) and the other is linear with current. Clearly, for formulating accurate detent force models for the purpose of successfully utilizing parametr…
This paper presents the origin of gallium (Ga) incorporation into AlN layers grown by metalorganic vapor phase epitaxy (MOVPE). We systematically investigated Ga incorporation from GaN deposits on the inner walls of a growth reactor and an underlying GaN layer. The Ga incorporation is not affected by the GaN deposits…
We investigate MR effect of GTO thin-film devices. It is found positive and negative MR effects. Something dramatically changes in GTO thin-film devices. Moreover, it is suggested that the GTO thin-film devices with oxygen of high concentration indicate negative MR effect. This may be due to the generation of random p…
In the multilevel interconnection process using the TEOS / SOG/ TEOS films planarization technology, the low refractive index TEOS film and the upper the Metal line layout have much affect the internal SOG film crack. Existence of the large area upper Metal line is indispensable for the occurrence of the SOG film crac…
Neat Epoxy, nano alumina composites, micro alumina composites and multi-nano alumina composites were prepared and experiment were performed to measure their partial discharge resistant characteristics. The partial discharge resistance obtained for the microcomposites, nanocomposites and multi-nanocomposites are compar…
Thin films of BaTiO3 and Co, Nb co-doped BaTiO3 on glass and Si (100) substrates were deposited by RF sputtering (at 350 ºC), and annealed. The amorphous and crystalline phases were observed for the as-deposited and annealed samples, respectively from the X-ray diffraction (XRD) studies. The magnetic behaviour of the…
Comparative evaluation of the physicochemical properties of samples of antioxidant 2,4,6-tri- tert -butylphenol, produced by different plants and used as a vulcanization inhibitor for butyl rubber-based composite material, has been carried out. An IR-spectroscopic examination of the antioxidant and its aqueous extract…
We added 0.0~0.5 wt% YBO3:Eu3+ nano powders to an electrolyte to improve the energy conversion efficiency (ECE) of a dye-sensitized solar cell (DSSC). TEM and XRD were used to characterize the microstructure and phases. Photoluminescence(PL) was used to determine fluorescence and the composition of the YBO3:Eu3+ Phosp…
Inter Bond Experimental Electron Density in Magnesium Ferrite Ceramic (MgFe2O4) Through XRD M.J. Viswanath, M. Aysha kani, S.V. Meenakshi, R. Saravanan The magnesium ferrite (MgFe2O4) sample is prepared with the solid state reaction method. It was characterized by Powder-XRD, UV-visible and SEM. The average crystallit…
We are researching Ga-Sn-O (GTO) thin film as a potential material for future semiconductor devices. In this study, we investigate the GTO thin film using Hall measurement. A GTO film is deposited using RF magnetron sputtering, and annealed using electric-furnace annealing in air at temperature of 350 °C. We utilize v…
InAs quantum dots (QDs) were grown on GaAs by molecular beam epitaxy using As2molecules (As2-QDs) and were structurally and optically characterized. Photoluminescence (PL) measurements revealed unique optical properties of the As2-QDs, which differ from InAs QDs grown with As4(As4-QDs). As2-QDs exhibited PL emission c…
This study investigated the effect of the changes in metal characteristics due to the hot forging on SCR420HB applied to ensure the optimal production of the hot-forging ratio on the mechanical properties of an automotive automatic transmission gear. The microstructural changes in the forging ratio were investigated b…
We have evaluated Ga-Sn-O (GTO) films fabricated using mist chemical vapor deposition (CVD). First, it is found that the GTO films are roughly transparent. Moreover, as the deposition temperature decreases, the transmittance becomes higher. Next, it is found that even if the carrier gas speed changes, the sheet resist…
Discharge in Long Air Gaps: Modelling and applications presents self-consistent predictive dynamic models of positive and negative discharges in long air gaps. Equivalent models are also derived to predict lightning parameters based on the similarities between long air gap discharges and lightning flashes. Macroscopic…
Eu doped GaN (GaN:Eu) shows a sharp line emission and thermal stability of the emission wavelength. To improve the optical properties, GaN:Eu nanocolumns were grown on GaN nanocolumn platform with high crystalline quality by rf-plasma-assisted molecular beam epitaxy. Although it was revealed that an increase of Eu con…
Discharge in Long Air Gaps: Modelling and applications presents self-consistent predictive dynamic models of positive and negative discharges in long air gaps. Equivalent models are also derived to predict lightning parameters based on the similarities between long air gap discharges and lightning flashes. Macroscopic…
ESD characteristics of the UHV resistors (UHVRs) has been studied. The UHVR under study suffers from a low ESD level. The failure analysis has been done with the aid of TLP measurements and simple equivalent circuit simulations. From the analysis, a transient large voltage difference on the field oxide due to the RC d…
The electrical properties of dispersions of a powdered ferroelectric nanocomposite based on ilmenite (FeTiO 3 ) and hollandite (K 1.46 Ti 7.2 Fe 0.8 O 16 ) in dioctyl phthalate have been studied by impedance spectroscopy techniques in a frequency range of 10 –1 –10 6 Hz. The influence of stabilizing additives of catio…
Summary form only given. Using MBE to grow extreme quantum confined heterostructures of 1-2 monolayers GaN/AlN as the active region on bulk AlN substrates, a DUV LED with room temperature electroluminescence at 250 nm MBE grown deep UV LED is demonstrated. LEDs on high quality bulk AlN substrates show significantly lo…
Pulse width modulation is a widely used technique for both DC to DC and DC to AC voltage conversion, with most modern-day DC and AC drives control systems exploiting this method. This paper presents a simple and versatile time domain method to determine the spectrum of a pulse width modulated converter output voltage…