Materials Literature
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Using combined ${\mathrm{Er}}^{3+}$ absorption spectroscopy and bulk magnetization measurements, the magnetic properties of ErCr${\mathrm{O}}_{3}$ in the ${\ensuremath{\Gamma}}_{1}$, ${\ensuremath{\Gamma}}_{2}$, and ${\ensuremath{\Gamma}}_{4}$ phases have been studied as a function of temperature and external field. T…
An empirical correlation shows that the activation energy for plastic flow in covalent solids equals twice the energy gap. This provides evidence that the flow rate is controlled by the rate of tunneling of bonding electrons into nonbonding states under the influence of the applied stress. The model yields an explicit…
The correlation between low-shear Newtonian melt viscosity and polymer molecular weight distribution in the high molecular weight region is inspected via the viscosity of homologous binary blends. It is confirmed that viscosity depends uniquely upon the weight average molecular weight and no other moment. The work of…
Abstract In the melt crystallization of isotactic polypropylene, poly(ethylene oxide) and poly(butene‐1) in contact with substrates, the existence of a fixed number of nucleating sites on the substrate surfaces has been established. When these sites become active successively (the transient in the number of nuclei is…
Abstract An attempt to determine protein denaturing potency of typical surfactants has been made by measuring specific rotation of bovine serum albumin. The potencies obtained were examined in relation to the intensities of skin roughness in vivo caused by the surfactants, and a noticeable correlation was found betwee…
SUMMARY Cyclotella atomus Hust., C. meneghiniana Kütz., C. comta (Ehr.) Kütz., C. antiqua W. Sm., C. michiganiana Skv., C. ocellata Pant., C. glomerata Bachmann, C. pseudostelligera Hust., and C. stelligera (Cleve et Grun.) V. H., were selected for ultrastructure investigations on the basis of their ready availability…
Electron microscopy reveals a characteristic structural organization consisting of poorly organized spherulites with an open fibrous texture in which the strands appear to be built up from microfibils. X-ray and birefringence results are also discussed.
Insoluble collagen was prepared from bovine periodontal ligament. Isolation and characterization of CNBr peptides originating from the alpha1(I), alpha2, and alpha1(III) chains showed that the tissue contained both type I and type III collagens. Further evidence for the presence of type III collagen was obtained by th…
Abstract Melt crystallization of isotactic polypropylene (iPP), poly(ethylene oxide), poly(butene‐1), and polycaprolactone in contact with various substrates (mostly polymeric) has been studied by hot stage polarizing microscopy. Nucleating abilities of surfaces have been characterized qualitatively by examining the s…
Abstract The starting material of a continuous silicon carbide fiber with very high tensile strength is a polycarbosilane. It begins to decompose from 300°C in vacuum and is gradually converted into a β-silicon carbide fiber by the heat-treatment at the temperature above 800°C.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComparison of linear nitrosyl and singly bent aryldiazo complexes of ruthenium. Structures of trichloronitrosylbis(triphenylphosphine)ruthenium, RuCl3(NO)(P(C6H5)3)2, and trichloro(p-tolyl)diazobis(triphenylphosphine)ruthenium-dichloromethane, RuCl3(p-NNC6H4CH3)(P(C6H5)3)2.C…
Measurements of the peak counting rate in the angular correlation curve of positron annihilation radiation have been performed in the solid and liquid phase of indium, lead, and aluminum, and in the solid phase of magnesium, as a function of temperature. In the solid phase In, Pb, and Al show at low temperatures the t…
Abstract The crystal field splitting of the 3 H 4 ground state of the Pr ion in PrFeO 3 and PrGaO 3 has been investigated by inelastic scattering of thermal neutrons. At several temperatures the transitions have been measured by TAS and TOF methods for polycrystalline PrFeO 3 and by the TOF method for polycrystalline…
A d-dimensional zonotope Z in Ed which is the vector sum of n line segments is linearly equivalent to the image of a regular n-cube under some orthogonal projection. The zonotope in En-d which is the image of the same cube under projection on to the orthogonal complementary subspace is said to be associated with Z. In…
An expression is derived for the "primary" pyroelectric coefficient. In contrast to currently accepted theory, it is proportional to ${T}^{3}$ near absolute zero, and it depends on the anharmonic potential in the same way as on the second-order dipole moment.
Single crystals of NdCr${\mathrm{O}}_{3}$ were studied by means of bulk magnetization, susceptibility, and optical-absorption spectroscopy measurements. This compound orders at ${T}_{N}=214$ \ifmmode^\circ\else\textdegree\fi{}K in a ${\ensuremath{\Gamma}}_{2}({F}_{x})$ canted antiferromagnetic spin structure which per…
The Onsager theory of dissociation, based upon the solution of Brownian equations of motion of charge carriers interacting through a Coulomb potential in an applied electric field, is shown to account for the electric-field-enhanced conductivity in solids. In contradistinction to often quoted one-dimensional macroscop…
Photoemission spectra of the second-row hydrides CH4, NH3, H2O, and HF, as well as Ne, obtained with ultrasoft (132.3 eV) x rays from the yttrium Mζ line and with soft x rays are compared and discussed. The 2s-derived 2a1 or 2σ orbitals show large relaxation energies, as do the 2s orbitals in the free atoms. The high…
The application of a static magnetic field to a single crystal of synthetic magnetite (${\mathrm{Fe}}_{3}$${\mathrm{O}}_{4}$) at 4.2\ifmmode^\circ\else\textdegree\fi{}K is found to induce a static electric polarization which is a nonlinear function of the components of the magnetic field and exists even in the absence…
Abstract The ability of corona treatment to render polyethylene film self‐adherent has been previously reported and the mechanism explained. A similar effect has now been found with corona‐treated poly(ethylene terephthalate) film which adheres strongly to itself when joined under conditions of heat and pressure that…