Materials Literature
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In this paper, we will discuss the use of the Lorentzian function as a possible candidate for the accurate approximation of the Preisach function in the modeling of scalar hysteresis for nonoriented grain steels. In particular we discuss here the identification procedure of the parameters of the function from measured…
Abstract Nonlinear optical vinyl polymers with high glass transition temperature ( T g ) were prepared by the functionalization of a fluorinated acrylate‐methyl vinyl isocyanate copolymer. A modified pathway to obtain a thiophene bridged chromophore was worked out. Poled films of the polymers show a fairly high and st…
This work presents the experimental results of the facing turning of an Al-Mg alloy. This aluminium alloy was mechanically and metallurgically modified, by means of cold rolling reduction and refining grain size previous to machining. The samples were cut and compared with samples in the as-received form, machined und…
Precipitation, growth, and coarsening of Si 3 N 4 crystals in (Si,Al,Mg,Y)(O,N) liquids at 1680°C has been studied. The initial nucleation of β‐Si 3 N 4 occurs mostly on α‐Si 3 N 4 because of the very high supersaturation of the liquid. After a brief period of growth, the crystals then undergo accelerated coarsening,…
The corrosion of aluminium in 1M HClO4 at 40° C has been investigated using the potentiodynamic polarisation technique. The effect of various inorganic additives has been investigated. It was found that NO3-, NO2- and SCN- anions exhibit an inhibiting action on acid corrosion of aluminium by reducing the general corro…
Surface potential of the H-terminated and locally oxidized diamond surfaces is investigated by Kelvin probe force microscope. Potential of H-terminated diamond surface is observed to be ∼0.1 V higher than that of oxidized diamond surface. Surface potential difference is attributed to the surface charge induced by the…
PURPOSE: For the effective internal radiation therapy of i.p. disseminated tumors, we developed avidin (Av)-dendrimer-chelate complex, which can be labeled with indium-111, emitting Auger and conversion electrons, with very high specific activity, and we studied its internalization, biodistribution, and therapeutic ef…
The effect of cooling rate on the coating microstructure and corrosion resistance of Zn - 4.5 wt-%Al alloy galvanising coatings applied to 0.7 mm gauge strip steel substrates is presented. Increasing the cooling rate by the use of a high powered air cooler does not significantly alter the volume fraction of primary zi…
Twin‐fluid atomization spray pyrolysis (SP) has been investigated for the production of lead zirconate titanate (PZT) powders, using aqueous solutions of lead acetate and zirconium and titanium alkoxide precursor reagents. The particle size distribution of the PZT powder showed a d 50 value of 0.3 μm, but with a small…
In this paper, a nonparametric identification algorithm of the Preisach distribution from the first-order reversal curve diagram is discussed. The method presented is important because no assumption is made on the shape of the Preisach distribution. The sensitivity and the limits of the method are also analyzed.
The crystal structure of the mitochondrial NAD-malic enzyme from Ascaris suum, in a quaternary complex with NADH, tartronate, and magnesium has been determined to 2.0-A resolution. The structure closely resembles the previously determined structure of the same enzyme in binary complex with NAD. However, a significant…
A perspective is given of the development and use of surface analysis, primarily by Auger-electron spectroscopy (AES) and x-ray photoelectron spectroscopy (XPS), for solving scientific and technological problems. Information is presented on growth and trends in instrumental capabilities, instrumental measurements with…
Abstract A structural comparison of three different crystalline forms of poly( β ‐propiolactone) (PPL) was carried out by wide‐angle X‐ray diffraction, Fourier‐transform infrared spectroscopy, and differential scanning calorimetry. The α ‐form in a hot‐drawn and annealed film represents a 2 1 helix conformation. The β…
Abstract In the present work, the effect of distribution of Carbon Black (CB) and rubber viscosity over the conductivity of rubber blend composites was studied. Preferential location of CB predicted by surface tension measurements and calculation of interfacial energy (wetting coefficient) was corroborated by dynamic…
Among unsymmetric oligomesogens, chiral dimers formed by connecting a cholesteryl ester fragment with various aromatic mesogenic cores through a polymethylene spacer have been attracting much attention due to their remarkable thermal behaviour. In particular, dimers containing a diphenylacetylene segment having an alk…
Abstract Poly(ethylene terephthalate) (PET) films have been functionalized with carboxyl groups by pulsed plasma polymerization of maleic anhydride (MA). The preserved anhydride groups of MA were converted to carboxyl groups by subsequent hydrolysis. Fourier‐transform infrared spectroscopy (FTIR) and X‐ray photoelectr…
X-ray reflectometry and GISAXS (grazing angle small angle scattering) are combined to investigate the morphology and structural parameters of a surfactant templated 2D hexagonal thin-film silica mesophase. It is shown that X-ray reflectivity measurements contain invaluable information about the radius of the cylindric…
Atomic force microscopy analysis of polyhydroxyalkanoate (PHA) inclusions isolated from sonicated Ralstonia eutropha cells revealed that they exhibit two types of surface structure and shape; rough and ovoid, or smooth and spherical. Smooth inclusions possessed linear surface structures that were in parallel arrays wi…
The effects of the physical aging on the vibrational density of states (VDOS) of a polymeric glass is studied. The VDOS of a poly(methyl methacrylate) glass at low energy ( < 15 meV), was determined from inelastic neutron scattering at low temperature for two different physical thermodynamical states. One sample was a…
In situ time-resolved small-angle X-ray and neutron scattering have been used to investigate the mechanism of a bulk precipitation of a hexagonally ordered ZrO 2 /surfactant mesophase. Using hexadecyltrimethylammonium bromide (CTAB) as a structure-directing agent, the precipitation results from the addition of sulfate…