Materials Literature
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The refolding of thermally denatured model collagen-like peptides was studied for a set of 21 guest triplets embedded in a common host framework: acetyl-(Gly-Pro-Hyp)3-Gly-Xaa-Yaa-(Gly-Pro-Hyp)4-Gly-Gly-amide. The results show a strong dependence of the folding rate on the identity of the guest Gly-Xaa-Yaa triplet, wi…
This paper extends the work of the first four parts of this series to apply the image analysis methods we have developed to characterize the fiber orientation of real non woven fabrics. The "real" fabrics chosen as typical are a carded crimped fiber web, two relatively dense overall or area bonded fabrics, a pattern o…
Summary The aim of this study was to investigate the surface composition and morphology of Chemithermomechanical pulp (CTMP) fibers from spruce. The fibers were exposed to a sequence of mild treatments such as washing, peroxide bleaching and extraction. The effects of treatments on fiber bulk composition and surface p…
Abstract This article reviews that clay literature from the last ten years, which is devoted to the applications of clay minerals in the interpretation of geological processes in sedimentary basins. The results, selected by the author as being of particular interest, are presented, arranged according to the successive…
In this paper we report coincident anomalies in both dielectric response and sound velocities in strontium titanate around three temperatures 16, 37, and 65 K. The anomalies occur in both single-crystal specimens and ceramics, so they cannot be related to grain boundary mechanisms, but they are enhanced by bismuth dop…
Numerous factors can modify the visibility or the actual dimensions of the skin microrelief and wrinkles. To quantify these changes, several methods, including clinical and non-invasive ones, have been proposed. This article reviews the advantages et drawbacks of all of them and lists some experimental recommendations…
Abstract Subsoil acidity is a serious constraint to crop production, and is difficult to correct by conventional liming practices. Thus, different approaches to ameliorating acid subsoils are needed. A column leaching study was conducted to compare the effects of chicken manure and sewage sludge amendments, each at 20…
Binary hard disc mixtures show eutectic freezing when the diameters differ by more than 30% and near the eutectic composition glasses can be formed without complications due to freezing. The glasses are characterized by measuring their equation of state and entropy. The glass transition is described by including the f…
This paper addresses the modeling of hysteresis in ferroelectric materials through consideration of domain wall bending and translation. The development is considered in two steps. First, dielectric constitutive relations are obtained through consideration of Langevin, Ising spin and preferred orientation theories wit…
The photoluminescence properties of porous silicon have been recently investigated through the attachment of a variety of alkenes and alkynes to the surface using hydrosilylation reactions. As an example, the photograph in the Figure shows the photoluminescence of a silicon surface that has been photopatterned by reac…
The frequency dependence of the complex dielectric constant of liquid crystal materials doped with tetra-n-butylammonium iodide (TBAI) is investigated in the low-frequency region, and the experimental results are analyzed in terms of space charge polarization. The contribution from an electric double layer is also tak…
A new gelcasting system based on aqueous‐based alumina‐poly(vinyl alcohol) (PVA) suspensions cross‐linked by an organotitanate coupling agent has been developed. The chemorheological properties of this system exhibited a strong compositional dependence. A sol‐gel phase diagram was established, which yielded the critic…
The natural orbitals and their corresponding occupation numbers are constructed for several interesting problems to demonstrate that the existence of negative natural orbital occupation numbers for single reference correlation methods provides a simple diagnostic for the need for a multiconfigurational description of…
The effect of polydispersity on the freezing transition of hard spheres is examined within a moment description. At low polydispersities a single fluid-to-crystal transition is recovered. With increasing polydispersity we find a density above which the crystal melts back into an amorphous phase. The range of densities…
The literature proposes some thermal models needed for the electrothermal simulation of power electronic systems. This paper gives a useful analysis about the choice of the thermal model circuit networks, equivalent to a discretization of the heat equation by the finite difference method (FDM) and the finite-element m…
Sintered submicrometer powder mixtures of strontium‐substituted lanthanum manganite and yttria‐stabilized zirconia have been studied in order to investigate the chemical stability of these materials as respectively electrode and electrolyte in solid oxide fuel cells. Formation of secondary phases was observed after 1…
Slow strain rate tests (SSRT) and fractographic examination of X-80 and X-52 pipeline steels showed transgranular stress corrosion cracking (TGSCC) could occur in a dilute aqueous solution with near-neutral pH. SCC intensity increased as the applied electrochemical potential and strain rates decreased. Hydrogen precha…
Polycrystalline Si 3 N 4 samples with different grain‐size distributions and a nearly constant volume content of grain‐boundary phase (6.3 vol%) were fabricated by hot‐pressing at 1800°C and subsequent HIP sintering at 2400°C. The HIP treatment of hot‐pressed Si 3 N 4 resulted in the formation of a large amount of ß‐S…
The sol−gel process from titanium alkoxide monomer to titanium oxide polymer was remarkably enhanced by salt catalysts containing basic anions and acidic cations. An ammonium carbonate catalyst promoted the precipitation of spherical titanium oxide particles at low concentrations of titanium alkoxide and water at room…
Optical thermometry based upon infrared excited upconversion fluorescence emission in Er/sup 3+/- and Er/sup 3+/-Yb/sup 3+/- doped Ga/sub 2/S/sub 3/-La/sub 2/O/sub 3/ chalcogenide glasses excited at 1.54 and 1.06 /spl mu/m, respectively, is presented. Temperature sensing in the region of 20/spl deg/C-220/spl deg/C wit…