Materials Literature
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A phenomenological theory separating an isochronal data of temperature dispersion of the complex dynamic modulus function of PET into α, β, and γ relaxation mechanisms (αI, αII, β, γI, γII, and γIII) was proposed on the basis of the following three assumptions: (1) additivity for assessing the contribution of each rel…
The thermal decomposition and the glass transition temperature of poly-p-tert-butylstyrene (PptBuS) were studied with a (DSC-2) differential scanning calorimeter. The undecomposed and decomposed polymers were analyzed by gel permeation chromatography for molecular weight distributions and by DSC-2 for changes in the p…
A tripod field is used as model for a general anisotropic fluid. The elastic energy density is expanded as invariant polynomial in the components of the contortion tensor. Surface energy terms are derived from compatibility conditions for the tripod field. The model is applied to cholesteric liquid crystals of large a…
Skinfold thickness measurements on 626 normal subjects of both sexes between the ages of 5 months and 73 years demonstrated a tri-phasic relationship between loss of skin thickness and age. Measurements for infants of either sex were indistinguishable and high, falling rapidly to levels which only changed slightly ove…
In order to find a sulfide solid electrolyte with high ionic conductivity, the electrical conductivities of alkaline earth sulfides and CaS doped with a rare earth sulfide or a titanium group sulfide were measured by the ac bridge-complex impedance plot method at 1073–1673 K. From the dependence of the conductivity on…
Abstract
The circular dichroism (c.d.) spectra corresponding to 7F0→5D1.2 and 7F1→5D0,1,2 transitions of the europium oxydiacetate crystal are reported. The electric dipole and magnetic dipole contributions to the total transition moment are separated for the principally magnetic dipole allowed 7F0→5D1 transition as well as fo…
The susceptibility of polymeric insulating materials to breakdown by ‘treeing’ has impeded their utilisation as insulation for high voltage cables. This review surveys the results of tests used to investigate tree initiation and propagation and discusses factors which affect the resistance of materials to breakdown by…
Abstract Bei den Bemühungen um die Erschließung neuer, regenerierbarer Rohstoffquellen für die Chemie kann die Stärke eine besondere Rolle insofern spielen, als sie als natürliches Polymeres durch Konversion und Modifizierung den Anforderungen, die sich aus einer Verwendung als Rohstoff oder Zwischenprodukt biotechnis…
An algorithm to evaluate depth-dose distributions produced by plane-parallel electron beams normally incident on two- or three-layer slab absorbers has been developed. It is based on a simple model of electron penetration across the interface, and makes use of empirical equations previously formulated as well as ones…
By a PdSO4–heteropolyacid(H3PMo6W6O40)catalyst system in the liquide phase cyclo-olefins, particularly cyclopentene and cyclohexene, are oxidized to the corresponding ketones.
A comprehensive analysis is given for water proton relaxation rates, T–11. and T–12, measured in solutions of Mn–EDTA2–. Protons of water molecules hydrogen-bonded to co-ordinating carboxylate oxygen atoms of EDTA make a significant contribution to overall relaxation rates. After allowing for these secondary solvation…
Deformation behaviour of L10(3R) type Ni–Al martensite was observed by tensile testing, optical-and electron-microscopy and X-ray diffraction. When the specimen initially consisting of four pairs of internally twinned L10 variants is pulled along a 〈001〉β1 axis of the mother phase, it becomes a single crystal of L10 m…
The microscopic process of void formation and propagation has been investigated in hydrogen embrittlement of iron. Specimens of pure iron in bamboo structure as well as polycrystalline specimens were tested in tension under cathodic hydrogen charging in 3%NaCl aq. at a current density of 100 A/m2. Origins of fractogra…
Formation of 27 R-AlN polytype ceramics and their mechanical properties were investigated in the typical composition of the AlN-SiO2. Densified 27 R-AlN polytype ceramics consisted of plate like grains without low temperature melting compounds at grain-boundaries were obtained by 2000°C presintering and subsequent 210…
Measurements of the electric permittivities and the splay and bend elastic constants of the cyano bicyclohexanes (CCH) are reported as a function of temperature. Comparison of the ratio of the bend to splay constants with that of analogous compounds containing phenyl rings shows unexpected trends, and attention is dra…
Cadmium tetrabenzoporphyrin, tetrabenzoporphyrin, and the bispyridine complex of magnesium tetrabenzoporphyrin were synthesized. As judged from the visible absorption spectra these compounds are not contaminated with porphyrin-like impurities. 100-MHz 1H Fourier-transform n.m.r. spectra of the above mentioned compound…
The calcite-CaC${\mathrm{O}}_{3}$(II) phase transition is described within the framework of the Landau criteria for continuous phase transitions. The $\stackrel{\ensuremath{\rightarrow}}{\mathrm{F}}$ point is chosen to construct the irreducible representation driving the transition. All Landau conditions are satisfied…
This paper presents the results of extensive laboratory tests and experience in industrial applications to explain the effects of iron on the corrosion resistance of titanium. In the great majority of cases where titanium is being used in corrosive environments, the effect of iron at the levels normally found in unall…
Porcine tracheal and bronchial explant cultures exposed to log-phase cultures of Bordetella, Candida, Corynebacterium, Haemophilus, Klebsiella, Mycoplasma, Pasteurella, Proteus, Saccharomyces, Staphylococcus and Streptococcus were examined for surface sequential changes by scanning electron and light microscopy. Infec…