Materials Literature
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Both the large linewidth of optical transitions as well as the sizeable “Stokes” shift seem to suggest strong localization effects in nitride quantum wells. In contrast, we clearly show that the “Stokes” shift can be easily understood in terms of the huge piezoelectric fields present in such structures. At the same ti…
The Gilmore formulation for bubble dynamics coupled with zeroth-order gas diffusion were used to investigate theoretically the cavitation activity produced by a modified XL-1 lithotripter [J. Acoust. Soc. Am. 105, 1997-2009 (1999)]. The model calculation confirms many of the basic features in bubble dynamics observed…
The tetratricopeptide repeat (TPR) motif is a protein-protein interaction module found in multiple copies in a number of functionally different proteins that facilitates specific interactions with a partner protein(s). Three-dimensional structural data have shown that a TPR motif contains two antiparallel α-helices su…
A quantitative model for pore growth during initial‐stage sintering is proposed. During initial‐stage sintering, neck formation leads to surface rounding of the pores, thereby causing a decrease in the surface area of the system. The decrease in surface area, without a concomitant decrease in pore volume, leads to a s…
The sensitization of ethane oxidation by NO above 800 K and the oxidation of HCN-natural gas blend (CH4-C2H6, 10:1) mixtures at 1050 to 1450 K, with and without NO, have been studied in a fused silica jet-stirred reactor (JSR) at 1 atm. A detailed chemical kinetic model developed for NO-reburning by natural gas (754 r…
N-(2-Hydroxypropyl)methacrylamide (HPMA) copolymer-adriamycin (ADR) conjugate (P-aconityl-ADR) was synthesized by the attachment of cis-aconityl-ADR to an HPMA copolymer precursor using 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide (EDC) as the condensing agent. The ADR release from the HPMA copolymer conjugate was pH…
The extent to which calcium carbonate deposition in an anaerobic reactor can be reduced by adding inhibitors (phosphate and iron) of calcium carbonate crystal growth was investigated. At several concentrations of the additive, the extent of precipitation was assessed in continuous experiments with laboratory-scale rea…
The Streptomyces lividans KcsA potassium channel, a homotetramer of 17.6 kDa subunits, was found to contain two nonproteinaceous polymers, namely, poly-(R)-3-hydroxybutyrate (PHB) and inorganic polyphosphate (polyP). PHB and polyP are ubiquitous cellular constituents with a demonstrated capacity for cation selection a…
A working group composed of 30 scientists representing 12 countries and three international organisations have prepared a comprehensive status and assessment report on the Partitioning and Transmutation (P and T) of actinides and fission products in the frame work of an advanced fuel cycle option and as an alternative…
The ${}^{29}\mathrm{Si}$ magic angle spinning NMR spectrum of ${\mathrm{Na}}_{8}{\mathrm{Si}}_{46}$ exhibits three resonances with large positive Knight shifts assigned to the inequivalent $(16i,$ $6c,$ and $24k)$ Si sites in the structure. The integrated intensities are in the ratio $[15.7\ifmmode\pm\else\textpm\fi{}…
IMPACT is the name of a program and of specific simulation software, which will perform full-scope and detailed calculations of various phenomena in a nuclear power plant for a wide range of event scenarios. The four years of the IMPACT project Phase 1 have been completed, and each analysis module of the prototype ver…
Metal-doped diamond-like carbon films were produced for the purpose of an electrochemical nanoelectrode. In this study we use Z-contrast scanning transmission electron microscopy to directly observe metal cluster formation and distributions within the chromium-doped carbon films. At low doping (∼6 at. % Cr), Cr is uni…
We report magnetization and electron-spin-resonance (ESR) measurements around the Curie temperature on single-crystal and ceramic colossal magnetoresistance manganites. The temperature dependence of the ESR linewidth below $\ensuremath{\approx}{1.1T}_{C}$ is well described in terms of a two-magnon scattering relaxatio…
Results of the idealized mode-coupling theory for the structural relaxation in suspensions of hard-sphere colloidal particles are presented and discussed with regard to recent light scattering experiments. The structural relaxation becomes nondiffusive for long times, contrary to the expectation based on the de Gennes…
Polyaniline films are studied by using potentiodynamic experiments simultaneously with the electrochemical quartz crystal microbalance. The influence of the chemical nature of different anions on the electropolymerization of aniline is investigated. Also, the role of ionic transport during redox reactions is emphasize…
An important aspect of molecular fluids is the relation between orientation and translation parts of the two-particle correlations. Especially, a detailed knowledge of the influence of orientation correlations is needed to explain and calculate in detail the occurrence of a nematic phase. The simplest model system tha…
In this paper, we present the results of studies on the synthesis and properties of a series of liquid–crystalline lanthanide complexes of imine ligands. We describe the liquid–crystalline behaviour as a function of the metal, ligand and anion employed and we report on the nature of the coordination between different…
A stable phase of relatively large hexagonal-wurtzite silicon crystals (up to 20 μm) was directly deposited at low pressure using ultraviolet laser ablation. The films were grown on a variety of substrates at room temperature from a single crystal, cubic silicon target. Crystallites of the hexagonal-wurtzite phase of…
Surface enhanced Raman (SER) spectra were acquired continuously with time during the galvanostatic reductive dissolution of the passive film grown on iron in borate buffer (pH 8.4) by anodic polarization at one of three different potentials, +1000, +600, and 0 mV (SCE). Complementary measurements of the SER spectra of…
This paper presents a procedure to characterize deformation behavior applicable to various engineering materials in machining processes. Orthogonal machining tests are used to obtain the relationship between shear stress, strain, strain rate and temperature. Shear plane temperature is measured by an infrared thermal i…