Materials Literature
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The crystal structure of lead tetraborate, PbO.2B 2 O 3 , has been refined using single-crystal X-ray diffraction data (Mo K α radiation, λ = 0.71069 Å). Crystal data at room temperature: M r = 362.43, orthorhombic, P 2 1 nm ( C 7 2 v ), a = 4.251 (2), b = 4.463 (3), c = 10.860 (3) Å, V = 206.04 Å 3 with Z = 2, μ = 40…
Assignment of the peaks near 485 em-I in vibrational spectra ofSi02-M7;:;Al02(where M = an alkali or alkaline earth element) glasses to v,(T-O-T) modes in four-membered rings was tested with molecular orbital calculations. Potential energy minima of cyclic (HsSimAln012)n- (where m + n = 4), Li2HsSi2A12012, Mg2HsA14012…
Dielectric and rheological measurements are reported on the effect of cure temperature on the water absorption of tris[(2,3-epoxypropoxy)phenyl] methane cured with a 1 : 1 stoichiometric ratio of 4,4′-diaminodiphenylsulphone. Analysis of the water absorption characteristics of these materials using a combination of di…
The Rodrigues parameterization of rotations offers an intuitively simple space which enables visualization of the geometric configuration of orientations and misorientations. Recent efforts have concentrated on promoting the use of Rodrigues vectors for orientation parameterization. In the present work a procedure for…
The transport behavior of aromatic hydrocarbons in crosslinked nitrile rubber (NBR) membranes has been studied in the temperature interval of 28°–70°C. NBR was cured by different vulcanizing techniques, viz., efficient, conventional, peroxide, and mixed. The peroxide system showed the lowest solvent uptake; and the co…
Abstract Copolymerization of γ‐butyrolactone (γBL) with ε‐caprolactone (εCL) initiated with aluminium isopropoxide trimer ([Al(O i Pr) 3 ] 3 , (A 3 )) is described. Copolymers with molecular weights ( M n ) up to 3 · 10 4 and containing up to 43 mol‐% repeating units derived from γBL are prepared. Their molecular weig…
Electrochemical oscillations at silicon electrodes anodized in hydrofluoric acid are a well known but poorly understood phenomena. It is less well known that potential oscillations are also observable during anodic oxidation in fluoride‐free electrolytes. In situ measurements of stress, as well as x‐ray reflectometry,…
Abstract Three natural spinels of different places of occurrence and compositions were investigated by means of microprobe chemical analysis, single crystal X-ray diffraction and Mössbauer spectroscopy. All cation distributions between T and M sites were calculated from microprobe and XRD experimental data, by means o…
Abstract The rotational molding processing method for plastics is steadily expanding its product range and market areas. However, a drawback of the process has always been the surface pin‐holes and internal bubbles that occur in the products because of the inherent nature of the process. In an attempt to alleviate thi…
Several new, more highly corrosion resistant titanium alloys containing a nominal 0.1 weight per cent of ruthenium have been developed and evaluated for industrial service in corrosive environments. These improved ruthenium-enhanced α, α-β and β titanium alloys are lower in cost than the corresponding palladium-contai…
Ammonium and borate substituents polarize π-electron systems, which then exhibit internal CT bands in the UV/Vis spectrum. These systems (for example 1) are distinctly more transparent than analogous push–pull-substituted compounds. Since their first-order hyperpolarizabilities are nevertheless similar to push–pull co…
The mean square displacement of protein hydration water has been found to increase nonlinearly in time, as observed for long times, by molecular dynamics simulations at low hydration levels and in proximity of the protein surface at full hydration. While such an anomalous diffusion is traced back to the more general p…
The crystal structure of FeAlO 3 has been determined at T = 298 K by neutron diffraction, using polycrystalline samples prepared in a high state of purity. The space group is Pna 2 1 , Z = 8; a = 4.9839 (1), b = 8.5544 (2), c = 9.2413 (2) Å. The structure, which is isomorphous to that of FeGaO 3 , can be described as…
The concentration dependence of optical phonons in the ${\mathrm{TiO}}_{2}$-${\mathrm{SnO}}_{2}$ system whose phase diagram exhibits a miscibility gap, has been studied by Raman scattering and Fourier-transform infrared spectroscopy. X-ray diffraction confirmed that the mixed oxides ${\mathrm{Ti}}_{1\mathrm{\ensuremat…
The wettability of glassy carbon by liquid silicon has been investigated at 1430°C in argon by using techniques of both in situ formation and capillary formation of sessile drops. Analyses of the results showed that there are three distinct contributions of reaction to wetting: (a) dissolution of solid substrate carbo…
Recently, a peroxidase-mediated amplification system has been described for immunofluorescence and fluorescence in situ hybridization studies. It is based on the deposition of hapten- or fluorochrome-labeled tyramide molecules. Although providing a significantly increased detection sensitivity compared to conventional…
Localized excitations (tunneling modes, soft harmonic vibrations) are believed to play a dominant role in the thermodynamics and transport properties of glasses at low temperature. Using instantaneous normal-mode (INM) analysis, we explore the role that such localization plays in determining the behavior of such syste…
Basic characteristics of basalt filaments are described. The main aim of this study is to explore tensile strength distribution based on experimental data. To select the appropriate failure risk function, the maximum likelihood method and methods based on order statistics are used. The use of basalt filaments in sewin…
A new type of restraint for the B factors of atoms in low- to-moderate resolution models of proteins is proposed. This restraint incorporates the knowledge that the B factors of two atoms bonded to each other may be systemically different. In addition, some bonded pairs of atoms will be more consistent from structure…
This paper deals with thermal insulation and thermal contact properties of woven fabric assemblies used to produce men's jackets. An important part of the paper is the description of the new computer-controlled instrument, the Alambeta, to measure insulation and thermal contact properties of fabrics. The heat flow pas…