Materials Literature
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Available data on embrittlement of duplex stainless steels (DSS) under cathodic protection (CP) in seawater, including some data previously unpublished, was reviewed. Results show hydrogen enters duplex alloys at typical protection potentials (–1 VSCE), but that the risk of failure is very low. The austenite phase ten…
ABSTRACT Browning and changes in the composition of sliced and whole carambola ( Averrhoa carambola L.) fruit during storage were investigated. Susceptibility to browning after slicing, packaging and storage for 4 wk at 4.4°C varied considerably between four cultivars and five selections. There was no difference in br…
This paper theoretically explores possible phase diagrams of the associating polymers in which macro- and microphase separation transitions coexist. Our model binary mixture consists of long chains (A) carrying f associative groups and short chains (B) carrying one associative group on their ends. Comb-shaped block co…
In a nematic liquid crystal where the director field has a splay-bend deformation mediated by the boundary conditions there is a certain intrinsic polarization density distribution characteristic of the flexoelectric properties of the medium. By application of an electric field perpendicular to the director, a twist i…
Formation of lead magnesium niobate (PMN) perovskite phase using a columbite type of precursor together with the addition of excess MgO has been investigated. When MgO and Nb 2 O 5 are reacted with 1:1 stoichiometry, a minor amount (}2%) of Mg 4 Nb 2 O 9 is formed along with the columbite‐type phase which in turn coul…
High-resolution transmission electron microscopy observations are presented of the motion of grain-boundary dislocations within an aluminium Σ = 3[011] bicrystal. The observations show the glide of dissociated a/3[111] grain-boundary dislocations on the incoherent Σ = 3(211) boundary. These dislocations are subsequent…
Leslie E. Sieburth, Elliot M. Meyerowitz, Molecular Dissection of the AGAMOUS Control Region Shows That cis Elements for Spatial Regulation Are Located Intragenically, The Plant Cell, Vol. 9, No. 3 (Mar., 1997), pp. 355-365
High voltage dc is required in a wide range of consumer, commercial, and military applications. Presently available PD analysis for dc systems can extend far beyond the old-fashioned "not more than 'n' PD pulses per minute over a given magnitude".
The development of advanced structural ceramics , which are used in specific components working under extreme conditions, require their microstructural analysis. The microscopy of structural ceramics is reviewed, beginning with various imaging techniques. The important microstructural features of three ceramics—alumin…
The semiconductor–metal phase change in VO 2 at approximately 67°C, which results in great changes in its optical, electrical, and magnetic properties, is described in detail. The synthesis of VO 2 thin films by the sol‐gel method is outlined and the structure and optical properties are characterized, including hyster…
A new analytic model, based on the interference of waves, and numerical calculations are exploited for analyzing the spectral behavior of the transmitted and reflected intensities from metal-based grating–waveguide structures. The results reveal that strong intensity changes can occur near resonance with resonance ban…
The best models available in the literature to analyze gelation in the diepoxide−cyclic anhydride copolymerization are based on the mean-field approach. A kinetic model was developed to account for the nonrandom steps of the copolymerization. Two kinetic schemes were employed with one including chain transfer steps. P…
All eukaryotic protein kinases share a conserved catalytic core. In the catalytic (C) subunit of cAMP-dependent protein kinase (cAPK) this core is preceded by a myristylation motif followed by a long helix with Trp 30 at the end of this A-helix filling a hydrophobic cavity between the two lobes of the core. To underst…
In order to better understand the gelation process associated with collagen assembly, and the mechanism of the in vitro morphogenetic phenomenon of "matrix-driven translocation" [S.A. Newman et al. (1985) Science, 228, 885-889], the viscosity and elastic modulus of assembling collagen matrices in the presence and abse…
Broad-band conductive spectroscopy covering a 10 mHz–1 GHz frequency range has been employed to examine the ionic motions in polypropylene oxide (PPO) complexed with 0–1% LiClO 4 at temperatures from -60 °C to 100 °C. The dc conduction appears as a plateau of the conductive spectra in their medium frequency range. As…
The present work showed a significant antinociceptive activity in the tannin fraction (TF) extracted from the bark of Myracrodruon urundeuva Fr. All. This inhibitory effect was demonstrated not only against abdominal contractions but also in the formalin test in mice. In the first case, at doses of 0.1 and 1 mg/kg, i.…
Upon reaction with osmium tetraoxide a series of porphyrins and chlorins were converted into the corresponding vic- dihydroxychlorins and bacteriochlorins. The presence of an electron-withdrawing substituent at a peripheral position on the porphyrins or chlorins deactivated that particular pyrrole unit toward oxidatio…
The electrochemical oxidation of several oligopyrroles, either unprotected, partially blocked, or totally blocked on their α-terminal positions or N-substituted, has been investigated in acetonitrile by cyclic voltammetry. For all the studied oligopyrroles, reversible voltammograms have been obtained at moderate to hi…
Six polyurethanes containing coumarin dimer components in the main chain have been prepared by polyaddition of diisocyanates with anti head-to-head 7-hydroxycoumarin dimer or anti head-to-tail 7-hydroxy-4-methylcoumarin dimer. 7-Acetoxycoumarin and 7-acetoxy-4-methylcoumarin were first prepared and then photodimerized…
Self-diffusion coefficients obtained by the NMR spin-echo method are reported for water at temperatures below 0 °C and at pressures up to 350 MPa in the liquid region bounded by the ice I and ice III phases. The data are compared with other measurements in this region.