Materials Literature
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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…
Measurements on the mechanical properties of copper-bismuth alloys show that the only effect of bismuth within the solid solution range is to reduce the true tensile strength of the alloys—there is no detectable effect on plastic behaviour or on the elastic limit. Intergranular fracture occurs by the formation of grai…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and structure of a hexanuclear nickel carbonyl dianion, bis(tri-.mu.2-carbonyl-tricarbonyltrinickel)(2-), and comparison with bis(tri-.mu.2-carbonyl-tricarbonyltriplatinum)(2-). Unprecedented case of a metal cluster system possessing different metal architectures f…
Abstract In hydrothermal reactions of lime and quartz with water or aqueous NaOH at 150 °C or 180 °C and Ca: Si = 0.83, the rate of reaction of the quartz increases with NaOH concentration. At 180 °C and Ca: Si = 0.83, the conversion into tobermorite of the semi‐crystalline calcium hydrosilicate initially formed occur…
The unified theory of absolute intensity measurements in small-angle X-ray scattering has been experimentally verified by determining a collimation system and wavelength-independent calibration constant for polyethylene (Lupolen). Consistent values of this constant were determined for three X-ray wavelengths (Ag Kα, M…
Abstract Isomeric homopolymers and random copolyesters based on sebacic acid and isomeric hexanediols were synthesized by condensation techniques and characterized by NMR, GPC, intrinsic viscosity, and DSC. Among the homopolymers, only the polyester derived from the linear 1,6‐hexanediol was found to be crystalline. T…
A general geometrical model, based on the assumption of a constant unit-cell configuration for a particular knitted construction and derived by the present author in a previous publication is applied to plain, interlock, and various rib-knitted constructions to enable simple relations to be derived for the effective d…
In order to illustrate the concepts of antibound ‘state’ and resonance, we present some simple examples of elastic scattering in one dimension. The phase shift, scattering probability, time delay, and wave amplitude are plotted as a function of energy for a particle incident on a square well (deuteron) and a square we…