Materials Literature
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Modelling of copolymerization of a monounsaturated monomer and a bisunsaturated monomer with equal and independent reactivities of double bonds is described. No rings are assumed to be formed before the gel point, and uncorrelated circuit closing beyond the gel point is allowed. These assumptions are approximately met…
A process was developed for the utilization of biotite mica, as a source of potassium, for the production of potassium chloride. The investigation was done in two stages. In the first stage, the kinetics of the reaction between biotite and HCl was studied and various kinetic parameters were evaluated. The reaction app…
Two cotton fabrics printed with two pigment types in six designs have been analyzed by a trained descriptive panel to evaluate the effects of pattern design, color, and fabric type on seventeen hand characteristics. The six designs include a 3.2 mm wide stripe, a paisley, a 6.4 mm diameter dotted design, a 25.4 mm wid…
Abstract The corrosion behavior or commercial Fe ana Co base alloys and Fe‐Cr model alloys with different contents of Co and/or Mn was investigated by continuous exposure tests in the presence of a thin carbonate film. All alloys studied form multi‐layered corrosion scales consisting of outer Li containing oxides and…
The structure, electron spin resonance, and electrical properties of potassium-loaded zeolite L have been studied as a function of metal loading up to a concentration of nine additional potassium atoms per unit cell. The incorporation of extra potassium into the dehydrated zeolite resulted in an increase in the room-t…
NiTi is only one of many alloy systems that exhibit the shape memory effect. The reason of his success is only the fact that it is the best in many aspects. His large market share created a significant price reduction so that in combination with its good properties, it became a preferential alloy even when compared wi…
As a one-step approach to the safe destruction of chlorocarbons, the reactions of trichloroethene, chloroform, and tetrachloroethene with ultrafine particles of calcium oxide have been studied. Calcium oxide prepared by an aerogel/hypercritical drying method (AP-CaO) is generally superior to conventionally prepared (C…
By polarized laser selective excitation, two single ${\mathrm{Tm}}^{3+}$ ion centers of tetragonal ${(C}_{4v})$ and trigonal ${(C}_{3v})$ symmetry have been identified in ${\mathrm{CaF}}_{2}{:0.05%\mathrm{T}\mathrm{m}}^{3+}.$ Both of these centers exhibit blue, violet, and ultraviolet upconversion fluorescence under r…
Abstract Slow crack growth (SCG) in a wide variety of polyethylenes has been investigated by a constant tensile load test (the PENT test) for a single edge notched specimen. The PENT test is very sensitive to the changes in molecular structure and morphology of polyethylene. The resistance to SCG depends on the densit…
This paper discusses the effect of penetrant-induced conditioning on the gas transport properties of four fluorine- containing polyimide isomers. The effects of substitution of bulky groups within the dianhydride residue of the polyimide and isomerism of the diamine residue on the penetrant-induced hysteresis of CO 2…
We have cloned the gene cluster encoding three subunits of membrane-bound gluconate dehydrogenase (GADH) from Erwinia cypripedii ATCC 29267 in Escherichia coli by performing a direct-expression assay. The positive clone converted D-gluconate to 2-keto-D-gluconate (2KDG) in the culture medium. Nucleotide sequence analy…
Based on the research of Niklasson et al. [Appl. Opt. 20, 26-30 (1981)], two effective medium theories, namely, the Maxwell-Garnett and the Bruggeman, for two-component systems are directly extended to three-component systems, and so theories for many-component systems can be obtained further. Note that one of these t…
In the first part of this work a simple model for the description of the radiant field in heterogeneous photoreactors was developed, based on the assumption of zero reflectance of the particles. In this second part of the investigation a limiting model is developed in which the above hypothesis is removed. In this las…
The dielectric properties and the effect of hydrostatic pressure on the successive phase transitions have been studied for single crystal CH3NH3PbX3 (X: Cl, Br, I). Anisotropic anomalies in dielectric constant at phase transitions are obtained. The pressure (p)-temperature (T) phase diagrams are shown for the three CH…
The results of an x-ray diffraction study of dc-magnetron sputtered tungsten thin films are reported. It is shown that the phase transformation from the β to α W can cause multilayered single-phase films where the layers have very different stress states even if the films are in the 500 nm thickness range.
A new crystalline polymorph of Bombyx mori silk, which forms at the air–water interface, has been characterized. A previous study found this structure to be trigonal, and to be distinctly different than the two previously observed silk crystal structures, silk I and silk II. This new structure was named silk III. Iden…
Thin films of a simple organosilane, propyltrimethoxysilane (PTMS), on polycrystalline aluminium and iron oxide substrates have been investigated using XPS. Comparison of the adsorption isotherms for the two substrates reveals significant differences between them. Although PTMS on iron oxide exhibits a Langmuir-like i…
Phosphorylcholine groups attached to polymer surfaces are known to improve hemocompatibility. A photochemical method is presented to couple phosphorylcholine-containing aryl azides to poly(etherurethane) surfaces (PEUs). Two aryl azides that consist of a photoactivatable 4-azidobenzoyl group, a short spacer chain, and…
The pressure dependence of the Raman spectra of SrTiO3 was investigated up to 15.5 GPa. The anti-ferrodistortive cubic–tetragonal phase transition (phonon condensation at the R point of the Brillouin zone) occurs at about 6 GPa. The strong, broad bands, present under ambient conditions, sharpen and change their profil…
The development of a process for the synthesis of methyl methacrylate (MMA) from coal-derived syngas can alleviate the environmental hazards associated with the current commercial MMA technology, the acetone cyanohydrin (ACH) process. A three-step syngas-based process consisted of synthesis of a propionic acid, its co…