Materials Literature
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The transmission of monochromatic light through the sandwich cell of MBBA (a typical n -type liquid crystal) with vertical alignment is investigated. When the cell is set in crossed Nicol and controlled by a.c. voltages, the transmissivity is zero at any voltage V below the threshold value V th . When V > V th , it sh…
Abstract Poly(ethylene terephthalate) oxidizes on heating at 300°C in an air stream. Various literature has cited crosslinking under such conditions through a butanetriol or a biphenyltricarboxylic acid. In this study gelled polymer was found to contain the latter trifunctional compound, but not the former. In additio…
When Byssochlamys is grown for production of ascospores, some of the asci break up into their constituent ascospores, whereas others do not. For heat resistance studies, it is desirable to prepare a uniform suspension of free ascospores. This was accomplished with the aid of a pressure cell, from which a suspension of…
Abstract The Raman spectrum of orthorhombic sulphur has been measured in the frequency range 0‐100 cm −1 for all polarisations. The A 1 g ( zz ) and B 1 g ( xy ) spectra have been clarified by later subtraction of unwanted scattering belonging to other polarisations. Definite assignments are made for all but one A 1 g…
The combined effect of film thickness and grain size diameter on the temperature coefficient of resistance of a uniform continuous polycrystalline metal film of thickness greater than the intrinsic mean free path has been theoretically investigated. It has been found that the value of the temperature coefficient of re…
Abstract The mechanical properties of gelatin films were studied in relation to the effect of water, and compared with those of collagen films. The S‐shaped sorption isotherm was separated into an adsorption curve C 1 and dissolution curve C 2 . From the C 2 curve, the interaction parameter χ 1 of Flory–Huggins' equat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of superstoichiometric poly(carbon monofluoride)R. J. Lagow, R. B. Badachhape, J. L. Wood, and J. L. MargraveCite this: J. Am. Chem. Soc. 1974, 96, 8, 2628–2629Publication Date (Print):April 1, 1974Publication History Published online1 May 2002Published inissue 1 A…
Abstract The photostabilizing effect of six Ni(II) chelates in films of polystyrene is compared with their efficiency in quenching triplet benzophenone and a correlation between the two established. In both polymer stabilizing and triplet quenching experiments, the diamagnetic chelates are more effective than the para…
Abstract Brillouin scattering of laser light has been used to study the temperature dependence of phonon velocity in a variety of amorphous polymeric systems, particularly internally and externally plasticized methacrylates. Discontinuities in the temperature coefficient of the hypersound velocities are observed at th…
The thermal conductivity vs temperature relation in deformed germanium single crystals is measured in the temperature range from 1.5 to 30 K. The results are analysed on the basis of the Callaway model. Klemens' theory on the scattering of phonons due to the static strain field of dislocations accounts for the experim…
Abstract The soils of the summit region of Mauna Kea are similar to the soils of the high mountain deserts and to the soils of cold deserts. Dramatic differences, however, exist between the soils of the summit and other neighboring cones and the soils of the glaciated terrain. The soils of some of the cones of the sum…
Two methods of calculation of indicatrices of diffuse X-ray scattering by globular proteins in a medium with a non-zero electron density are described. The methods are used in calculation of curves of scattering by sperm whale native myoglobin in different solvents. The indicatrices obtained are close to the experimen…
Article Notizen: Die Kristalldaten der Goldhalogenide AuBr3 und AuCl / The Lattice Parameters of the Gold Halogenides AuBr3 and AuCl was published on April 1, 1974 in the journal Zeitschrift für Naturforschung B (volume 29, issue 3-4).
Algal and fungal microfossils recovered from the type area of Matanomadh Formation (Palaeocene), in the district of Kutch, Gujarat have been described. The assemblage comprises 20 genera and 27 species. Out of these, 10 genera and 13 species belong to algae and 10 genera and 14 species belong to fungi. Of the algae, L…
Abstract Enzymatic properties of a purified Penicillium nuclease (designated as nuclease P1) were investigated. The enzyme activities for RNA, heat-denatured DNA, native DNA, 3′-AMP and 2′-AMP showed a great degree of similarity with respect to the following properties: a) Range of stable pH (5~8), b) temperature opti…
Abstract The effect of cold rolling on the Izod impact strength of amorphous polycarbonates has been studied. The impact strength is a function of the roll reduction as well as the original sheet thickness. Sheets varying from 0.125 to 0.645 inches in thickness have been studied and roll reductions up to 50 percent ha…
An investigation is described in which, by means of a two-dimensional model of the plain-knitted structure, load-extension curves for extension in the course direction were calculated theoretically. It was assumed initially that the only mechanism of fabric extension was elastic deformation of the loop shape. Account…
Tests and analysis show that containment of missile-like steel disk fragments by a steel cylindrical shell is a sequential two-stage process. Stage 1 involves inelastic impact and transfer of momentum to include an effective target mass. For nonperforation, the energy dissipated in plastic compression and shear strain…
Abstract Copolymers of poly(ethylene terephthalate) (PET) containing 1–24% poly(diethylene glycol)terephthalate (PDEGT) were prepared and characterized by infrared spectra. The energy and entropy of activation for the thermal degradation were measured for these copolymers and for the PDEGT. These activation energies a…
The mathematical analysis of the notched‐beam specimen for fracture‐energy determination considers a beam containing a zero‐volume crack, i.e. a crack with zero width. Such a configuration is difficult to reproduce in practice with ceramics, and artificially cut notches with widths large relative to the scale of the c…