Materials Literature
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The second-order nonlinear optical (NLO) properties of some bisdithiophene d8 metal complexes, for example, the donor–acceptor unsymmetrically substituted bisdithiophene nickel(II) complex shown in the Figure, are reported for the first time. The synthesis and characterization of the complexes are described and the re…
The genus Chaetoceros , one of the most important genera of diatoms in the marine plankton, has been investigated from 20 stations in Danish waters during the period 1991–1995. Thirty‐five taxa were identified, 18 of which were brought into culture for further morphological studies. Three taxa are reported for the fir…
The substitution of methionines with leucines within the interior of a protein is expected to increase stability both because of a more favorable solvent transfer term as well as the reduced entropic cost of holding a leucine side chain in a defined position. Together, these two terms are expected to contribute about…
We report the experimental observation and analysis of optical second-harmonic generation in the 3R and 2H polytypes of molybdenum disulfide (MoS2) by a fundamental excitation wavelength of 1064 nm. We include an extension from the literature to account for multiple reflections of the fundamental, anisotropic optical…
Mechanical properties of silicon nitride which was superplastically deformed in plane‐strain compression were investigated. Superplastically deformed silicon nitride exhibited a highly anisotropic microstructure, where rod‐shaped grains tended to be aligned along the extruding direction. The bending strength and fract…
The antifungal activity of chitosan, a biopolymer of beta-1-4 glucosamine, against Alternaria alternata f. sp. lycopersici , causal agent of black mold of tomato, was investigated. Chitosan was incorporated into potato-dextrose broth at concentrations of 100-6400 mug ml - 1, and the growth and toxin production by the…
Flexoelectric coupling gives rise to a linear electro-optic response in cholesterics (flexoelectrooptic effect) with a uniformly lying helix (ULH) structure and this electro-optic effect is strongly reliant on the homogeneity and quality of the texture. The ULH structure, unfortunately, is complicated in itself and ma…
Polarized Raman and infrared espectra of l-threonine crystals have been obtained at room temperature and an assignment of normal modes is proposed based on group theory analysis. The usefulness of these assignments comes from the fact that some modes are related to important vibrations that can show changes under diff…
Carbon nanotubes exhibit unusual electronic and mechanical properties which vary with subtle changes in microstructure, applied electromagnetic field and mechanical deformations, and introduction of topological defects. These novel properties offer unprecedent opportunities to study fundamental physics, fabricate adva…
The formation of a poorly crystalline layer‐lattice type of magnesium silicate has been demonstrated in mixtures of magnesium hydroxide with hydrated silicic acid that has been intimately combined via grinding and then aged at room temperature for six months. X‐ray diffractometry, Fourier transform infrared spectrosco…
Formation energies of oxygen and uranium vacancies, interstitials and Frenkel pairs as well as Schottky trio defect energies in uranium dioxide are calculated by means of the linear muffin-tin orbital supercell method in the atomic sphere approximation. These ab initio results are in qualitative agreement with experim…
The mesomorphic behaviour of a liquid crystalline sheet-shaped 2,4,6-triarylaminothe 1,3,5-triazine bearing six peripheral decyloxy chains has been investigated in binary mixtures with two-fold alkoxy substituted non-mesomorphic benzoic acids. Each investigated equimolar mixture exhibits an enantiotropic columnar phas…
Experimental studies were carried out on infrared-active phonons in the Aurivillius ferroelectric ${\mathrm{SrBi}}_{2}{\mathrm{Ta}}_{2}{\mathrm{O}}_{9}$ (SBT), using reflectivity measurements (down to $200{\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$) and transmission measurements (down to $100{\mathrm{cm}}^{\mathrm{\ensu…
Hot‐stage transmission electron microscopy studies of lanthanum‐modified lead zirconate titanate (Pb 1‐ x La x ‐(Zr 0.53 Ti 0.47 ) 1‐ x /4 O 3 (PLZT 100 x /53/47) have been performed for compositions close to the morphotropic phase boundary (MPB). These studies have revealed the coexistence of relaxor and normal ferro…
A nonbarotropic continuum bubbly mixture model is used to study the one-dimensional cavitating flow through a converging-diverging nozzle. The nonlinear dynamics of the cavitation bubbles are modeled by the Rayleigh-Plesset equation. Analytical results show that the bubble/bubble interaction through the hydrodynamics…
Abstract The network density in unfilled EPDM vulcanizates was studied by the following methods: low resolution, proton T 2 NMR relaxation, Mooney—Rivlin analysis of stress—strain curves, and equilibrium swelling experiments. For the vulcanizates as such, the NMR method measures the total network density, which is com…
Deposition of metallic iridium thin films has been achieved by sputtering an Ir target with argon. The deposition of the Ir films was investigated at argon gas pressures in the (10–40) mTorr range with various rf power densities. The stress, resistivity, and structure of the Ir films were systematically determined as…
The effect on the Hall hole concentration and the thermoelectric coefficient of various elemental impurities in SnTe containing excess Te and in some solid solutions based on it is investigated in the temperature interval 300–900 K. The variation of the kinetic parameters is treated on the basis of the concept of reso…
The Potts Monte Carlo simulation was used to simulate microstructural evolution in uranium dioxide fuel rods. During service, grain growth, pore migration, and thermal segregation of the pores and UO 2 occur in the rods in a thermal gradient. In this investigation, we developed a model which simulates simultaneous gra…
A composite oxide containing samaria‐doped ceria [SDC, ( CeO 2 ) 0.8 ( SmO 1.5 ) 0.2 ] and yttria‐stabilized zirconia [YSZ, ( ZrO 2 ) 0.92 ( Y 2 O 3 ) 0.08 ] was developed as an electrolyte for a solid oxide fuel cell (SOFC). A SOFC with a YSZ electrolyte was characterized by a high open‐circuit voltage (OCV) and a st…