Materials Literature
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Tubular specimens of oxygen-free, high-conductivity copper have been deformed by hot torsion at 800° C (1073 K) (O.8T m ) or at 950° C (1323 K) (0.9T m ) at strain rates of 3.7–11.1 S−1 to true strains of ∼ 30. The specimens were quenched to room temperature in 3 s under one of two conditions: stopping the deformation…
The vibrational spectra of a number of transition metal tetra-oxo-complexes are reported for the first time, including those of salts containing the anions [RuO4]–; [MO4]2–(M = Mn, Fe, or Ru); [MO4]3–(M = Cr, Mn, Re, or Fe); and [MO4]4–(M = Ti, V, Cr, Mo, W, Fe, or Co). From these measurements and published data on th…
Abstract The temperature dependence of the isothermal growth rate of spherulites and overall crystallization kinetics of different fractions of poly (ethylene oxide) over the range of molecular weight from 300 to 20,000 were studied by calorimetry, dilatometry, and polarized light microscopy, in order to establish the…
The temperature behavior of the TO-phonon frequencies and line shapes in NaN${\mathrm{O}}_{2}$, as observed by Raman spectroscopy, is reported for temperatures from 20 to 250\ifmmode^\circ\else\textdegree\fi{}C. The Raman spectra of the ferroelectric phase obeyed the selection rules of the ${C}_{2V}^{20}$ space group.…
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Despite many attempts over the years to rationalise stress corrosion cracking in terms of a single mechanism, it is proposed that the growing body of evidence more readily supports a continuous spectrum of mechanisms. Thus, it is suggested that in those systems of metal and environment where the conditions are between…
Differential thermal analysis (DTA) is an instrumental technique used for studying the physical and chemical changes that occur in materials as they are heated or cooled. When a material undergoes a physical change, such as melting or crystalline transformation, or when a chemical reaction occurs, energy is either abs…
Abstract The thermal decomposition of a polyester and a polyether flexible foam in a nitrogen atmosphere has been studied by gas chromatography, mass spec‐trometry and elemental ultramicroanalysis. It is shown that the decomposition behaviours of the two foams are similar. At low temperatures (200 to 300 °C) there is…
The shape memory effect, by which a material, apparently plastically deformed, reverts to its original shape upon heating to some higher temperature, has been reviewed and discussed from the point of view of the crystallography of martensitic transformations. Considering the general characteristics of martensitic mate…
Scanning electron microscopy of the dentinal tubules and the odontoblast processes was performed on young premolars that had been fractured to open the tubules in the crown dentine parallel to theiraxis. The tubules were viewed in an outward direction, starting from the attached pulp tissue at the buccal pulp horn. Th…
Design parameters are presented for various geometrical arrangements of the cylindrical mirror electron energy analyzer. The theory and operation of this high quality instrument are discussed and compared with an experimental device. Similar properties of a parallel plate analyzer with second order focusing are review…
Es wurde die Verwendbarkeit von Acetat, Glucose, Fructose, Galactose, Saccharose und Lactose als Kohlenstoffquelle fur das Wachstum von 72 Chlorella-Stammen, die 10 autotrophen Taxa angehoren, untersucht. Im Dunkeln zeigen mit Acetat 34 Stamme und mit Glucose 37 Stamme gutes Wachstum (Chlorella kessleri, die meisten S…
A more realistic, two-phase structural model is proposed for the amorphous solid state of polymers. The model is based on structural evidence reported to date, in particular the evidence from our own electron diffraction and microscopy studies of crystallizable and non-crystallizable amorphous polymers, including near…
The 1,4-dioxan (dx) complexes NaClO4,3dx, NaBF4,3dx and NaI,3dx have the cubic structure of AgClO4,3dx. The metal ion is octahedrally co-ordinated by oxygen atoms from dioxan with Na–O distance 2·43—2·46 Å, identical to those found in Na(OH2)6 octahedral Size and shape requirements limit the anions found in complexes…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation Edward B. Graper; Deposition of Aluminum from an Electron Beam Source. J. Vac. Sci. Technol. 1 Ja…
Abstract Thermodynamic functions for mixing of a solvent with a crosslinked (branched) polymer are derived by considering the primary chains as copolymers of crosslinked and uncrosslinked units. Primary chains and solvent molecules are placed on a lattice with coordination number z. The crosslinked units bear one cros…
The conformational behaviour of 1,1′-disubstituted tetra benzopentafulvalene is strongly substituent-dependent; in the 2,2′-difluoro-derivative, the energy barriers associated with the cis–trans-isomerization did not prove to be low.
Abstract The optical rotatory dispersion of solutions of cellulose acetates with different degrees of acetylation in a series of solvents is studied. Increasing the degree of esterification of the cellulose acetate results in a shift of the optical rotation to more negative values. These changes have been explained on…
The transformation between a long‐period antiferro‐magnetic and a triangular‐type weak ferromagnetic phase was investigated by magnetic, x‐ray and neutron diffraction methods on polycrystalline and single‐crystal samples of non‐stoichiometric Mn3Sn with hexagonal DO19 structure. The transition is of first‐order, being…
Abstract : The TPRC Data Series published in 13 volumes plus a Master Index volume constitutes a permanent and valuable contribution to science and technology. This 17,000 page Data Series should form a necessary acquisition to all scientific and technological libraries and laboratories. These volumes contain an enorm…