Materials Literature
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Fabrication of a Ti 2 AlN MAX phase for contact applications to GaN--based devices is reported. Sample characterisation was done by means of X-ray diffraction and secondary ion mass spectroscopy. Successful Ti 2 AlN monocrystalline growth was observed on GaN and Al 2 O 3 substrates by annealing sputter-deposited Ti, A…
Room-temperature powder electron paramagnetic resonance (EPR) spectra of drusy quartz (i.e., euhedral quartz crystals as coatings on or infillings in cavities and fractures) from five uranium mineralized areas in the eastern Athabasca basin, Saskatchewan, Canada, reveal a suite of radiation-induced defects. These EPR…
Partial discharge (PD) online monitoring of transformers by ultra-high-frequency (UHF) approaches has been paid increasingly attention recently. High-qualified UHF antennas are focused on as one key technique. This paper presents two types of compact UHF antennas in small sizes, a Hilbert fractal antenna and a small l…
Heusler alloys with nickel rich nominal composition Ni2+xMn1-xGa (x = 0.16 - 0.26) were prepared by arc-melting and subsequent homogenization by annealing. A large magnetic entropy change around room temperature was observed in the alloy where martensite-austenite structural and ferro-para magnetic transition temperat…
The dynamic yield strength and tensile (spall) strength of the D16T aluminum alloy are measured when samples are loaded by submicrosecond plane shock waves. The initial (unannealed) and annealed material is studied, and alloy samples subjected to multiple forging at elevated temperatures are also examined. The loading…
The effect of various nanocrystalline plasma-electrolytic carbonitriding of a commercially pure titanium in a glycerol bath with various additives, such as carbamide, sodium nitrate, and triethanolamine, was studied. Effects of the bath composition on chemical composition and corrosion resistance of the PEC/N films we…
Electromigration is a major source of wire and via failure. Refueling undoes EM for bidirectional wires and power/ground grids—some of a chip's most vulnerable wires. Refueling exploits EM's self-healing effect by balancing the amount of current flowing in both directions of a wire. It can significantly extend a wire'…
Surface coatings of pseudo‐binary Al 2 O 3 –Zr 2 O 3 (Y 2 O 3 ) eutectic oxides were produced by laser melting of the surface of conventionally sintered materials using a high‐power diode laser. It was possible to obtain smooth, homogeneous, and crack‐free coatings up to 50 × 7 mm 2 in area by carefully controlling th…
Due to the recent strategic initiative adopted by the Ohio Department of Transportation (ODOT) to reduce highway crashes, there is a current need to determine if surface friction testing results can be correlated to wet weather crash data in Ohio. The establishment of such correlations would allot ODOT to develop a pr…
Although optically active defects in nanodiamond are being considered ad candidates for optical labeling in biomedical applications, development in this area is being hindered the fact that suitable defects are rarely seen in diamond nanoparticles in the size regime required. These defects usually form as a complex wi…
This paper presents a mathematical homogenization technique able to handle fine periodic structures in presence of magnetic saturable/hysteretic media. The modeling approach, based on the multiple scale expansion theory, enables the evaluation both of equivalent electric parameters and effective magnetization curves (…
The effect of the Coulomb scattering on graphene conductivity in field-effect transistor structures is discussed. Interparticle scattering (electron-electron, hole-hole, and electron-hole) and scattering on charged defects are taken into account in a wide range of gate voltages. It is shown that an intrinsic conductiv…
The structures of the ɛ-FeOOH, ɛ-FeOOD, and β-GaOOH phases, which belong to the InOOH structure type (the distorted TiO2 structure type), are determined using single-crystal X-ray diffraction analysis. The measurements are performed on Xcalibur CCD and CAD-4F diffractometers. The calculations are carried out in space…
Abstract Novel FeII complexes with N4O2 donor sets having extended π-conjugated aromatic rings, [Fe(qnal)2]·CH2Cl2 and [Fe(qnal)2], show abrupt spin transitions at 220 and 265 K, respectively. Both complexes show LIESST effects below 80 K.
A novel process of surface modification for multiwalled carbon nanotubes (MWCNTs) by using electron cyclotron resonance plasma is proposed. The process uses a H 2 /O 2 gas mixture as etching gas and applies a bias voltage of −250 DCV to the process stage to extract and accelerate hydrogen and oxygen cations. The gener…
The review summarizes the synthesis and study of properties of the bioconjugates of chlorophyll a and bacteriochlorophyll a with carbohydrates, carboranes and other moieties, focusing on the synthetic methods of obtaining conjugates and preliminary biological testing thereof. Boronated chlorins and bacteriochlorins ca…
Single-phase hexaferrite compounds were obtained in a novel series of Dy-substituted Ba hexaferrites with nominal formula (Ba1-xDyx)Omiddot5.25 Fe2O3( x=0-0.30). The samples were prepared by the chemical coprecipitation method from nitrate precursors and calcination at T= 900-1200degC for 2 h. Analysis of XRD powder p…
In this paper, we investigate eddy current loss in divided Nd-Fe-B sintered magnets for synchronous motors, from both sides of measurement and finite element analysis. First, the basic experiments with an exciting coil and divided magnets are carried out. The results are compared with the 3-D finite element analysis t…
Determining the breakdown strength of dielectric films is tedious, as the breakdown strength at 1% breakdown probability is more relevant to system insulation design than the Weibull characteristic breakdown strength, and obtaining reasonable confidence limits at 1% breakdown probability requires very large numbers of…
DFT calculations, using the PW91, OLYP, and B3LYP functionals, have provided some of the first estimates of the relative energies of the Ni(I) and Ni(II) ligand anion radical states of hydroporphyrin complexes. Although the three functionals chosen sometimes yield discordant results, the results of this study are esse…