Materials Literature
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A Σ = 11, {332} nickel bicrystal was grown by solidification. The aim of this paper is to show the evolution of the grain-boundary (GB) structure depending upon the position in the bicrystal of the extracted sample. Conventional transmission electron microscopy and high-resolution transmission electron microscopy (HRT…
A comprehensive model has been developed for the computation of corrosion rates of carbon steels in the presence of lithium bromide (LiBr)-based brines that are used as working fluids for absorption refrigeration cycles. The model combines a thermophysical module that provides realistic speciation of aqueous systems w…
Several banana-shaped liquid crystal materials with perfluorinated terminal chains have been synthesized. A dimorphism SmA-B2 was proved by X-ray studies and electro-optical measurements. The unusual ratio d/L (d = layer spacing, L = molecular length) and the unexpected behaviour of the layer spacing at the phase tran…
In this article a study on the melting behavior and microstructure of semicrystalline poly(ethylene naphthalene-2,6-dicarboxylate) (PEN) prepared by crystallization from the glass under different annealing conditions is presented. The influence of the annealing temperature (Ta), annealing time (ta), and the heating ra…
The (FePt)100−xCrx alloy thin films with x=0–16 at. % were fabricated on natural-oxidized Si(111) substrate by dc magnetron sputtering. The as-deposited films were annealed between 300 and 750 °C in order to transform the soft magnetic fcc γ-FePt phase to the hard magnetic fct γ1-FePt phase. The addition of Cr in the…
Abstract: Two additional cDNA clones containing genes which encode fucoxanthin chlorophyll a/c binding proteins (Fcps) of the centric diatom Cyclotella cryptica have been sequenced. The first cDNA clone containing fcp12 had an insert size of 871 base pairs (bp). The open reading frame (ORF) of 693 bp corresponds to a…
The dynamics of a single-air bubble trapped in a resonant sound field in water has been characterized by Mie scattering and a Streak camera with high spatial and temporal resolution. The streak images show that in the endphase of the cavitation collapse the scattered light intensity is no function of the bubble radius…
We have synthesized two forms of erbium tetracyanoplatinates, Er2[Pt(CN)4]3.21H2O (red form) and Er2[Pt(CN)4]2.SO4.11.5H2O (yellow form), and determined their crystal structures by X-ray diffraction. While the red form crystallizes in the orthorhombic space group Pbcn, with a = 15.4848(3) A, b = 13.8186(2) A, c = 19.0…
We present the results of molecular dynamics simulations of two-dimensional (2D) hard disk systems in the vicinity of melting. The simulations are used to calculate the elastic constants, which can be used to estimate the location of the Kosterlitz-Thouless dislocation unbinding transition. Simulations on defect-free…
The response of Al 2 O 3 and Al 2 O 3 /SiC nanocomposites to lapping and polishing after initial grinding was investigated in terms of changes in surface quality with time for various grit sizes. The surface quality was quantified by surface roughness ( R a ) and by the relative areas of smooth polished surfaces as op…
In this paper we present a modified ‘rotating analyser’ technique that allows rapid and continuous in situ measurements of the optical tilt angle (θ). Using this technique we will detail the tilt angle behaviour in mono-mesogen (AB) and bi-mesogen (ABA) low molar mass orga- nosiloxanes. The AB type molecules exhibit o…
In a recent paper [J. Opt. Soc. Am. A 16, 1108 (1999)] Logofatu et al. demonstrated by experimental and numerical evidence that the 0th-order cross-polarization (s to p and p to s) reflection coefficients of isotropic, symmetrical, surface-relief gratings in conical mount are identical. Here an analytical proof is giv…
Large scale atomistic simulations are used to investigate the properties of screw dislocation dipoles in copper. Spontaneous annihilation is observed for dipole heights less than 1 nm. Equilibrated dipoles of heights larger than 1 nm adopt a skew configuration due to the elastic anisotropy of Cu. The equilibrium split…
The asymptotic theory is used for evaluation of the cross section of resonant charge exchange for most elements of the periodical system. An analysis is given of the accuracy of the data obtained. The error for the cross sections at collision energies of the order of 1 eV varies from 1% for hydrogen and elements of th…
Using half-metallic ferromagnets in spin-dependent devices, like spin valves and ferromagnetic tunnel junctions, is expected to increase the device performance. However, using the half-metallic ferromagnet NiMnSb in such devices led to much less than ideal results. One of the possible sources for this behavior is atom…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSelf-Assembly of a Polypeptide Multi-Block Copolymer Modeled on Dragline Silk ProteinsYun Qu, Sonha C. Payne, Robert P. Apkarian, and Vincent P. ConticelloView Author Information Department of Chemistry, Oglethorpe University Atlanta, Georgia 30319 Integrated Microscop…
We describe polarizing films formed from the lyotropic liquid crystalline phases of dyes dissolved in water. The dye polarizers possess a high dichroic ratio close to that of conventional polarizers. In addition, the dried dye films provide a uniform homogeneous orientation for thermotropic nematic materials. Therefor…
Environmental conditions under which localized corrosion of carbon steel could take place in simulated groundwater were examined. Using specimens with crevices, it was determined that at potentials above the repassivation potential, the ratio of the chloride concentration to the total carbonate concentration, solution…
The synthesis of aluminum nitride (AlN) via self‐propagating high‐temperature synthesis (SHS) was attempted, using aluminum powder that was mixed with AlN powder as a diluent. The AlN content in the reactant was varied over a range of 30%–70%, and the nitrogen pressure was varied over a range of 0.1–1.0 MPa. The SHS r…
A mathematical model based on Frenkel's theory for charged defect segregation at interfaces is used to calculate the equilibrium grain boundary depletion layer widths and conductivity profiles in acceptor‐doped SrTiO 3 ceramics. The calculations examine the effect of oxygen vacancy equilibration during annealing at mo…