Materials Literature
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Abstract The degradation of ammonium polymethacrylate and polymethacrylamide has been studied by a combination of thermal analysis methods (TVA and TG) and examination of volatile and involatile products by infrared analysis. It is shown that total reaction comprises an initial cyclization and further fragmentation of…
An idealized composite model of a square biaxially loaded coated fabric is proposed. The model consists of straight linearly elastic yarns embedded in a thin layer of a linearly elastic isotropic coating material with the system loaded in the plane of the membrane. Governed by the assumptions of small strains, equatio…
Heat-capacity and magnetic-susceptibility measurements at low temperatures on single crystals of RbCo${\mathrm{Cl}}_{3}$\ifmmode\cdot\else\textperiodcentered\fi{}2${\mathrm{H}}_{2}$O are described here which indicate that this material is the first reported example of a magnet which can be formally described as having…
The coat protein of Bacillus subtilis spores comprises about 10% of the total dry weight of spores and 25% of the total spore protein. One protein with a molecular weight of 13,000 to 15,000 comprises a major portion of the spore coat. This mature spore coat protein has histidine at its NH2 terminus and is relatively…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT2,2,6,6-Tetramethyl-4-oxo-1-(1,1-diphenylethoxy)piperidine: synthesis and thermal stabilityJ. A. Howard and J. C. TaitCite this: J. Org. Chem. 1978, 43, 22, 4279–4283Publication Date (Print):October 1, 1978Publication History Published online1 May 2002Published inissue 1 Oct…
The compressive behavior of a rigid polyurethane foam reflects its geometric structure and the physical properties of the matrix polymer. Foam properties may be modified by the inclusion of silica particles in the polymer matrix. These silica particles alter the mechanical properties of the base polymer as well as the…
Bicrystals of niobium with symmetric tilt boundaries grown directly from the melt with bicrystal seeds have been used as a model system to measure the resistive critical current Ic as a function of the applied transverse magnetic field H and angle φ, between H and the grain boundary plane. The specimens were investiga…
Earlier Raman studies confirming the molecular dissolution of protium and Geuterium in silica have been extended to include room-temperature measurements of the vibra ional-rotational Raman bands and the temperature dependence (11-800 K) of the $Q$ bands. Observation of the $S$ bands provides evidence for ${\mathrm{H}…
The effects of deviations from an ideal lamellar structure (infinite-size clusters of parallel layers of alternating electron densities) on the small-angle scattering curve are treated with the aid of the correlation function. If surrounded by a matrix of the average electron density, reduction of the size of the clus…
Although the magnetic properties of Cr–Fe alloys have been widely studied, there are different interpretations of existing data in the literature, especially for alloys in the concentration range 10 to 25% Fe. The onset of ferromagnetism occurs somewhere in this concentration range, but there is little direct evidence…
Machine learning (ML) is transforming all areas of science. The complex and time-consuming calculations in molecular simulations are particularly suitable for an ML revolution and have already been profoundly affected by the application of existing ML ...Read More
The curious phenomenon of shell torsion arose independently among members of two separate lineages within the Pteriomorpha (Bivalvia), the Arcidae and the Bakevelliidae. In torted bivalves the shell is twisted about the hinge axis normal to the antero-posterior direction, and the usually two-dimensional plane containi…
Polycarbonate absorbs water in two stages: in the initial period of absorption at an elevated temperature all of the water was found in an unassociated state when cooled to room temperature; and, in the second stage, most of the additional water absorbed by the polymer was identified in a separate liquid phase (cluste…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrganometallic intercalates of the layered transition-metal dichalcogenides tantalum sulfide (TaS2) and zirconium sulfideRene P. Clement, Warwick B. Davies, Keith A. Ford, Malcolm L. H. Green, and Allan J. JacobsonCite this: Inorg. Chem. 1978, 17, 10, 2754–2758Publication Da…
Abstract The interfacial tension α between water and hexane solution of 1-octadecanol has been measured as functions of temperature T, pressure p, and mole fraction of 1-octadecanol in hexane x10 by the pendant drop method. The curves of γ vs. T, γ vs. p, and γ vs. x10 show noticeable break points. Calculated thermody…
Elastic-neutron-scattering experiments performed on the linear-chain mercury compound ${\mathrm{Hg}}_{3\ensuremath{-}\ensuremath{\delta}}\mathrm{As}{\mathrm{F}}_{6}$ are presented. On cooling, a progressive phase ordering between the Hg chains, randomly phased at room temperature, has been found and characterized. Sho…
Limited proteolysis of T4 helix destabilizing protein (gene 32 protein = gp32) produced three stable products, gp32*I, gp32*II, and gp32*III. Gp32*I and gp32*II produced by chymotrypsin digestion were purified by duplex DNA-cellulose column chromatography and their amino acid compositions, NH/sub 2/-terminal sequences…
Abstract X‐Ray diffraction pole figure measurements have been made on six films blown from high‐density polyethylene. Five were prepared on an experimental unit; the sixth, blown on commercial equipment, had a higher degree of overall orientation thus enabling more extensive results for the a‐, b‐ , and c ‐axis distri…
Epoxy network systems based on DGEBA (bisphenol-A-diglycidyl ether) and NMA (nadic methyl anhydride) systems modified with the low molecular weight CTBN (carboxyl-terminated butudiene-acrylonitrile copolymer) rubbers were prepared and studied. It was found that below the glass transition of the epoxy matrix these mate…
A novel mechanism for spin-pairing at defect centres in amorphous silicon is proposed and discussed in terms of simple chemical bond arguments. Unlike the case of chalcogenide glasses (or amorphous arsenic), the presence of non-bonding (lone-pair) orbitals is found to be unnecessary in producing a negative effective H…