Materials Literature
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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…
Connective tissue, composed of approximately 80 % collagen, has been isolated from cardiac muscle. Physicochemical studies of the soluble collagen from this source revealed an α1:α2 ratio of 14:1, a ratio far in excess of that required for molecules of the chain composition [α1(I)]2α2, suggesting that at least some of…
In an investigation of the factors which determine the rate of electrolytic corrosion of the Al metallization in plastic-encapsulated ICs operated in a moist atmosphere, the surface conductivity of thermal SiO2 was measured as a function of relative humidity and temperature. Electrolysis in the water film adsorbed at…
If the coherency strain induced in an epitaxial crystal is a shear without dilatation it can be accommodated by a network of screw dislocations. If the crystal is rotated away from epitaxy about the normal to the interface plane, the misfit dislocations retain their screw orientation and the energy of the interface de…
When grown in medium containing urea and nitrate, wild type Aspergillus nidulans possesses approximately 2-fold higher activities of four enzymes of the pentose phosphate pathway and 3-fold higher activity of glucose phosphate isomerase than when grown in medium containing urea. The activities of one enzyme of the pen…
Abstract Four topics related to the cationic polymerization of cyclic acetals and mainly based on the author's results are reviewed. The kinetics of the H − transfer from linear and cyclic acetals and ethers to the triphenylmethyl cation were examined. A linear correlation between the 1 H‐NMR shift of the H‐atom to be…
The crystallization and amorphization of Te-As-Ge films with GaAs injection lasers has been investigated. Power density measurements for crystallization and amorphization are presented, and a reverse-mode write-read-erase cycle is demonstrated. The results show that direct bit storage is feasible with an injection las…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAcidites and partition coefficients of fluoromethanesulfonamidesR. D. Trepka, J. W. Belisle, and J. K. HarringtonCite this: J. Org. Chem. 1974, 39, 8, 1094–1098Publication Date (Print):April 1, 1974Publication History Published online1 May 2002Published inissue 1 April 1974h…
The cell wall of Sulfolobus acidocaldarius has been isolated. Cells were mechanically disrupted with a French press, and the cytoplasmic membrane was removed by extracting cell-envelope fragments with Triton X-100. The Triton-insoluble cell wall material retained the characteristic subunit structure when examined in t…
Abstract Semicrystalline polymers generally exhibit moduli well below their theoretical limit due to chain folding and to lack of crystal alignment. Modulus increases attainable through standard drawing procedures are limited by sample fracture before large draw ratios are reached. Using an Instron capillary rheometer…