Materials Literature
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The structure of eutectoid steel 80 has been studied at various stages of producing high-strength large-diameter reinforcing bars using transmission and scanning electron microscopy. Peculiar features of structural state have been revealed by the scale factor. It has been demonstrated that the stage of intensive stren…
This work presents a new interior rotor type permanent magnet synchronous motor with direct on line starting ability, which employs both circumferentially magnetized as well as radially magnetized magnets, and consequent pole concept resulting into better steady state performance. Two dimentional (2D) time-stepping fi…
Frozen modes arising in stacked subwavelength hole arrays are studied in detail. Their origin is proved to be connected with the interaction between the extraordinary transmission resonance and the Fabry--Perot cavity mode. The analysis is done for various situations that differ in metal plate thicknesses and sizes an…
This paper presents a comparative study of the electromagnetic performance of 6-stator/4-rotor pole switched reluctance (SR) machines having AC sinusoidal bipolar excitation which is equivalent to salient-pole synchronous reluctance (SynR) machines having different non-overlapping concentrated winding connections, i.e…
In this paper, the failure mechanisms of the direct bonding copper (DBC) substrate under the condition of temperature cycling are studied. The cyclic temperature considered ranges from -40°C to 200°C. Furthermore, finite element method is used to optimize the DBC substrate structure in order to reduce the thermal stre…
In this work a characterization system for high energy-density capacitors is described and demonstrated. Capacitors are being designed using thin-film technology in an attempt to achieve higher energy-density levels by operating the devices at a high voltage. These devices are fabricated from layers of 100 nm aluminum…
A comprehensive study of reliability failure modes in an advanced through-silicon via (TSV) mid process flow is presented in Part I of this paper. This is the first time unique TSV mid reliability failure modes at leading-edge TSV dimensions have been observed and reported. TSV Kelvin, comb and chain test structures w…
The paper proposes a novel configuration of a direct-drive single-side axial flux motor for hydraulic pump applications. The use of soft magnetic composites (SMC) for the rotor core and the stator poles enables a compact design, efficient and smooth operation, particularly profitable for home appliances. The electroma…
The gene encoding an NAD(+)-dependent, 3-hydroxyisobutyrate dehydrogenase (3HIBDH-IV) from Pseudomonas denitrificans ATCC 13867 was cloned and expressed in Escherichia coli BL 21 (DE3) and characterized to understand its physiological relevance in the degradation of 3-hydroxypropionic acid (3-HP). The deduced amino ac…
Hydrogen generation by water electrolysis is a renewable method of producing fuel and industrial feedstock. Ni-based H2-evolution catalysts in alkaline media are low-cost alternatives to the noble-metal-based electrode materials used in acidic media. However, Ni cathodes show a significant decrease in their hydrogen e…
V-gate GaN high-electron-mobility transistors (HEMTs) are fabricated and investigated systematically. A V-shaped recess geometry is obtained using an improved Si 3 N 4 recess etching technology. Compared with standard HEMTs, the fabricated V-gate HEMTs exhibit a 17% higher peak extrinsic transconductance due to a narr…
The carbon doped TiO2 nanoparticles with different amount of carbon content were prepared using starch as the carbon source. The physical properties of the as-prepared catalyst were determined using X-ray diffraction, transmission electron microscopy and UV-vis diffuse reflectance spectroscopy. The results showed that…
The difference in refractive indices of glass substrate and transparent conducting oxide (TCO) electrode causes optical reflection in thin film solar cells, which results in lower absorption of light for devices. An anti-reflection layer between glass and TCO is required to reduce the loss of light due to optical refl…
Ten small dictyostelids isolated from samples collected from the surface humus layer of seasonal rainforests of Belize and Guatemala were studied morphologically, and nine were found to represent distinct species, all with an average height of < 2 mm (0.5-3.5 mm). Although their fruiting bodies (sorocarps) closely res…
This paper proposes a bipolar excitation scheme for a 6-slot and 8-pole (6/8) mutually coupled switched reluctance motor (MCSRM) to reduce torque ripple. Under the proposed excitation scheme, the 6/8 MCSRM is operated as a 6-phase machine. The excitation scheme proposed includes two excitation modes. A shift angle bet…
Coreless substrate is a promising next generation substrate. Coreless substrate has very low z-height, which means such substrate will be lighter, smaller and it will have very short interconnection, fine linewidth, and good power integrity. But the major challenge for coreless substrate manufacturing and assembly pro…
PURPOSE: Articular Cartilage has limited potential for self-repair and tissue engineering approaches attempt to repair articular cartilage by scaffolds. We hypothesized that the combined hydroxyapatite and zirconia stabilized yttria would enhance the quality of cartilage healing. METHODS: In ten New Zealand white rabb…
New composite materials based on isotactic PP and fullerene were prepared via in situ polymerization with the use of an isospecific metallocene catalytic system. The stress-strain properties, thermophysical characteristics, and reactivities of composites in reactions of high-temperature decomposition, oxidation, and c…
CuZnSnSe thin films were deposited by thermal vacuum evaporation with and without argon gas stream at room temperature. Effect of argon gas on surface morphology and on photoelectrochemical (PEC) characteristics of the films was studied. The electrodes prepared under argon gas showed better enhanced characteristics, d…
The method of auxiliary sources is applied to solve problems of electromagnetic wave diffraction by certain metal-dielectric structures that are finite 3D periodic lattices embedded in an ordinary dielectric. On the basis of the structures under study, the possibilities of designing antenna devices with a desired patt…