Materials Literature
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Abstract Electrochemical measurements (steady‐state current‐voltage curves and AC impedance) were coupled with mass‐loss measurements, SEM examinations, and EDSX analyses to investigate the inhibition of corrosion of a carbon steel by a mixture of phosphonic acid HEDP (acid 1, hydroxyethylene, 1‐1 diphosphonic) and so…
AA 5182 aluminium alloy with a strong cube texture was cold rolled to different reductions along the following directions: firstly, the original rolling direction; secondly, at angles of 22.5 and 45° to the original rolling direction. The evolution of texture in the cold-rolled samples with different initial textures…
Glutamine-binding protein (GlnBP) from Escherichia coli is a monomeric protein localized in the periplasmic space of the bacterium. It is responsible for the first step in the active transport of L-glutamine across the cytoplasmic membrane. The protein consists of two similar globular domains linked by two peptide hin…
Low-pressure low-frequency NH3 plasmas have been used for the surface modification of bulk polyethylene films and of octadecyltrichlorosilane (OTS) self-assembled monolayers deposited on oxidized silicon wafers. The incorporation of nitrogen-containing groups by the plasma treatment has been followed by contact angle…
A new technique of fluidized-bed metal–organic chemical vapour deposition (FB-MOCVD) is developed as a one-step method to prepare highly dispersed metal-supported catalysts for carbon nanotube synthesis. By using ultrafine powder of gamma-alumina (70 nm Sauter mean in size) as the support with Fe(CO)5 and Mo(CO)6 as t…
In a recent paper, Koshny, Markos, Smith, and Soukoulis [Phys. Rev E 68, 065602 (2003)] report that their computations show that the product of imaginary parts of electric permittivity and magnetic permeability in a passive media is negative. They also criticize a well-known theorem that both imaginary parts are posit…
Abstract The solubility of butane and isobutane in molten polypropylene (PP) and polystyrene (PS) was measured at pressures up to 3 MPa and along four isotherms from 438 to 483 K for PP and from 348 to 473 K for PS. The solubility increased with increasing pressure and decreasing temperature. At 438 K and 2 MPa, the s…
Abstract For Abstract see ChemInform Abstract in Full Text.
Abstract New nanocomposites based on a vinylester resin (VER) and the organo‐montmorillonites (ODA‐M, BHL‐M, DEM‐M, BHLV‐M) modified with octadecylammonium, bis(2‐hydroxyethyl)lauryl ammonium, diethyl[2‐(methacryloyloxyl)ethyl]ammonium, and bis(2‐hydroxyethyl)lauryl(vinylbenzyl)‐ammonium chlorides, respectively, were…
Neutron powder diffraction (NPD), ac susceptibility and electron magnetic resonance (EMR) techniques were employed for studying the crystallographic structure and magnetic ordering in $\mathrm{Ca}{\mathrm{Mn}}_{1\ensuremath{-}x}{\mathrm{Ru}}_{x}{\mathrm{O}}_{3}$ $(x\ensuremath{\leqslant}0.40)$ manganite system. It is…
Based on the Kubo formalism, electronic transport in macroscopic quasiperiodic systems is studied by means of an efficient renormalization method, and the convolution technique is used in the analysis of two- and three-dimensional lattices. For the bond problem, we found a transparent state located at a center of self…
One of the key criteria in measuring the effectiveness of position sensitive detectors (PSDs) is that of sensitivity—how large an electrical signal can be produced for a given change in the incident light position. The larger the signal produced, then the less additional electronics for amplification required. In this…
The effect of the pretreatment on the interaction between NO and Au−TiO 2 was examined using DRIFTS as a monitoring tool. For calcined and reduced Au−TiO 2, adsorption of NO on the TiO 2 support is not promoted under the conditions employed. Au(NO) 2 is the predominant species on oxidized and reduced Au−TiO 2 with ini…
We combine classical and quantum-mechanical simulations to study the structural changes in $\mathrm{Ca}\mathrm{Ti}{\mathrm{O}}_{3}$ under irradiation. We identify common defects, and suggest that their stability is related to the covalent character of Ti-O bonding. We address the issue of resistance to amorphization b…
We present photoconductivity and Raman scattering data obtained from composite films of poly(paraphenylene vinylene) (PPV) and single-walled carbon nanotubes at different weight concentrations from 0% to 64%. It is found that the introduction of nanotubes in the PPV precursor polymer solution, heated at $300\ifmmode^\…
We report a high-pressure Raman scattering investigation of $(1\ensuremath{-}x)\mathrm{Pb}({\mathrm{Mg}}_{1∕3}{\mathrm{Nb}}_{2∕3}){\mathrm{O}}_{3}\text{\ensuremath{-}}x\mathrm{Pb}\mathrm{Ti}{\mathrm{O}}_{3}$ $(\mathrm{PMN}\text{\ensuremath{-}}{\mathrm{PT}}_{x})$, which is considered as a prototype relaxor-based piezoe…
We present new and refined data for the magnetic field $(H)$ and temperature $(T)$ dependence of the proton spin-lattice relaxation rate $(1∕{T}_{1})$ in antiferromagnetic molecular rings as well as a new explicit scaling formula that accurately reproduces our data. The key ingredients of our formulation are (1) a red…
Optical spectroscopy and x-ray diffraction were used to study the behavior of polycrystalline samples of pure monoclinic zirconia irradiated by low energy ions. A microscopic model based on these experiments is proposed to explain the displacive phase transition observed in this material after irradiation. Defects, pr…
Thin Nd-Fe-B films have been prepared by pulsed laser deposition on sapphire substrates. A Ta buffer layer has been used to promote epitaxial growth. The deposition temperature has been varied between 400 \ifmmode^\circ\else\textdegree\fi{}C and 700 \ifmmode^\circ\else\textdegree\fi{}C and proved to be an important pa…
Abstract Polyamide 6 (PA6)/organo‐montmorillonite nanocomposites prepared by melt compounding using a co‐rotating twin‐screw extruder were intercalated nanocomposites. The modulus, bending strength and heat distortion temperature of these nanocomposites increased with increasing clay content, and tensile strength incr…