Materials Literature
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Subcritical crack growth in terms of velocity–stress intensity factor ( v – K ) curves in lead zirconate titanate (PZT) were experimentally characterized on poled and unpoled compact tension specimens. The poled specimens were tested under open‐ and short‐circuit electrical boundary conditions, which resulted in an in…
Among all the transition metal sulfides, ruthenium sulfide (RuS2) has been shown to be the most active catalyst for the hydrodesulfuriztion processes. Using X-ray photoemission spectroscopy (XPS) and scanning tunneling microscopy (STM), we have found a novel approach for the preparation of RuS2 nanoislands on an Au(11…
The momentum and energy dependence of the weight distribution in the vicinity of the one-electron spectral-function singular branch lines of the 1D Hubbard model is studied for all values of the electronic density and on-site repulsion U . To achieve this goal, we use the recently introduced pseudofermion dynamical th…
A vacuum arc plasma evaporation (VAPE) method using both oxide fragments and gas sources as the source materials is demonstrated to be very effective for the preparation of multicomponent oxide thin films. Highly transparent and conductive Al-doped ZnO (AZO) thin films were prepared by the VAPE method using a ZnO frag…
A web application for inferring potentially stabilizing non-bonding interactions in macromolecular structures from input atomic coordinate data is described. The core software, called Monster, comprises a PERL wrapper that takes advantage of scripts developed in-house as well as established software in the public doma…
Abstract New trends of electron paramagnetic resonance (EPR) are reviewed in studies of the electronic excited states conducted during this decade. The studies include EPR of excited triplet states in fluid solution and excited multiplet states in a triplet–radical pair system. Together with these new areas, advanced…
Several hot‐pressed and sintered SiC variants were impacted with tungsten‐carbide (WC) spheres at velocities up to 1700 m/s. Ballistic response curves of areal density penetrated as a function of impact velocity were generated to compare ceramics for ballistic applications. Observed response curve features are shown t…
The extremely thermophilic bacterium Thermus thermophilus HB27 synthesizes lysine through alpha-aminoadipate (AAA). In this study, a T. thermophilus gene encoding the enzyme that catalyses transamination of AAA was cloned as a mammalian kynurenine/AAA aminotransferase (Kat2) gene homologue. A T. thermophilus mutant wi…
The aqueous, lyotropic liquid-crystalline phase behavior of the alpha-helical polypeptide, poly(N(epsilon)-2-[2-(2-methoxyethoxy)ethoxy]acetyl-lysine) (1), has been studied using optical microscopy and X-ray scattering. Solutions of optically pure 1 were found to form cholesteric liquid crystals at volume fractions th…
We report results on the observation of energy transfer between CdTe nanocrystals and AlexaFluor dye molecules. The nanocrystals were attached to the surface of polystyrene latex beads of 450 nm in diameter by means of the layer-by-layer technique. Energy transfer was observed as signal enhancement in confocal imaging…
Indium molybdenum oxide (IMO) films were made from an oxidized target with In2O3 and MoO3 in a weight proportion of 99:1 by using a high density plasma evaporation with the substrate maintained at room temperature. Effects of the oxygen contents of 1%–28.6% on the structural and optoelectronic properties of the IMO fi…
We report electronic structure calculations within density functional theory for the hydrated superconductor and compare the results with the parent compound . We find that the intercalation of water into the parent compound has little effect on the Fermi surface outside of the predictable effects of expansion, in par…
The present study elucidates the local structure and formation mechanism of a hybrid system based on poly(isoprene- block -ethylene oxide) diblock copolymers (PI- b -PEO) as structure directing agents for organically modified ceramic (ormocer) precursors, (3-glycidyloxypropyl)trimethoxysilane (GLYMO), and aluminum sec…
Abstract ATI 425 was originally developed for hot-rolled armor plate to provide ballistic protection comparable to Ti-6Al-4V and has been evaluated against a variety of projectile threats for use as armor. While processing the alloy for armor plate applications, it was observed that the material exhibited very good ho…
Nano‐crystalline PbSnO 3 was synthesized by a sol–gel route. It was an anion‐deficient pyrochlore ( a = b = c = 1.0677 nm) with space group Fd3m. TEM images confirmed the nano‐size of particles as ∼10 nm, aggregated into larger clusters up to 1 μm. DSC‐TGA investigation revealed that the PbSnO 3 was unstable >800°C…
Nanocrystalline powders of Lu2O3:Eu with activator content varying between 0.2%-10% were prepared using four different methods of synthesis. The products differed in their microstructure and crystallites sizes. Combustion of Lu(NO3)3 with urea produced strongly agglomerated material, most probably with significantly n…
Mechanism of the cationic ring opening polymerization of cyclosiloxanes is still not fully understood. For example, the role of tertiary silyloxonium ions as the intermediates in this process is still controversial. Formation of trisilyloxonium ions generated from hexamethylcyclotrisiloxane, D3, and octamethylcyclotet…
This work is to study the element distribution and microstructure of Sm-Co 2:17 permanent magnets with Ni, Pr, and Ti substitution using TEM/STEM and nanoprobe EDS techniques. Pr substituting for Sm does not affect the microstructure but can prompt the diffusion of Cu into cell walls. Ti is almost uniformly distribute…
Abstract A great number of stable and metastable structures associated with the Al—Ni—Co decagonal phase were observed in a continuous range from binary Al—Co to binary Al—Ni. Two independent basic binary compounds forming the continuous row of the decagonal solid solutions are argued for Al—Ni—Co. The formation of di…
The corrosion resistance of polymer bonded nanocrystalline NdFeB magnets with Nd-rich, stoichiometric, and Fe-rich compositions and that of their main constituent single phases is assessed in aqueous environments. For the evaluation of corrosion properties, gravimetric tests as well as potentiodynamic polarization mea…