Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCollagen structure in solution. IV. Conformational properties of refolded cross-linked chainsPeter V. Hauschka and William F. HarringtonCite this: Biochemistry 1970, 9, 19, 3745–3754Publication Date (Print):September 15, 1970Publication History Published online1 May 2002Publ…
The 93Nb nuclear magnetic resonance has been studied in sintered powders of the solid-solution system LiNbO3–LiTaO3. The Nb nuclear quadrupole coupling constant decreases linearly with an increase in LiTaO3 concentration and this behavior agrees with the calculated electric field gradient. A variation of the 93Nb NMR…
The self-diffusion coefficients of copper in copper-zinc alloys containing 0-4-at.% zinc have been measured at 894.4 and 946.7\ifmmode^\circ\else\textdegree\fi{}C. These results, together with the correlation factor for the diffusion of zinc in copper as determined from measurements of the isotope effect, are used to…
The absorption coefficients of Al, Si, and SiO were determined in the extreme uv with high spectral resolution, using synchrotron radiation. A detailed comparison of the ${L}_{\mathrm{I}\mathrm{I},\mathrm{I}\mathrm{I}\mathrm{I}}$ edge in the metal and in the semiconductor shows important differences. The spikes observ…
The electrical resistivities of iron-base alloys with Cr, W, Mn, Ru, Co, Ni, Si, or Ge solutes, and of nickel-base alloys with Cr, Fe, Cu, or Pd solutes were measured from 4.2 \ifmmode^\circ\else\textdegree\fi{}K to above the Curie temperatures $\ensuremath{\theta}$. The solute resistivities ${\ensuremath{\rho}}_{r}(T…
Measurements of the temperature variation of x-ray diffraction peak intensities have been used to show that the mean-square thermal displacement of Pb in PbTe is approximately twice that of Te. This phenomenon is explained, using a calculation of the mean-square displacements from vibrational eigenvalues and eigenvect…
A table of additive covalent radii for tetrahedrally coordinated crystals is obtained by simple quantum-mechanical considerations using the bond lengths of the four diamond-type crystals and only two free parameters. The 39 bond lengths so obtained agree with experiment with an rms error of less than 1%. The extension…
The electronic band structure and optical constants of diamond are calculated using the empirical-pseudopotential method with an additional $\ensuremath{\ell}=1$ nonlocal term ${V}_{\mathrm{NL}}(\stackrel{\ensuremath{\rightarrow}}{r})$ added to account for the strong potential experienced by $p$ electrons in the core…
The dielectric loss factor and dielectric permittivity of 8–16 mol% solutions of chlorobenzene, o-dichlorobenzene, and 1-chloronaphthalene in cis-decalin; 50–60 mol% mixtures of pyridine with chlorobenzene, bromobenzene, 1-chloronaphthalene, and toluene; 50–60 mol% mixtures of tetrahydrofuran with bromobenzene and 1-c…
EPR spectra of $\mathrm{F}\mathrm{e}\ensuremath{-}{V}_{\mathrm{O}}$ pairs were used to study how the order parameter of SrTi${\mathrm{O}}_{3}$ varies with uniaxial stress applied to a (111) face. A second-order cubic-trigonal phase boundary appears above the stress-free transition temperature ${T}_{a}$. A first-order…
Measurement of the tilt angle of the smectic $C$ phase of terephthal-bis-($4\ensuremath{-}n\ensuremath{-}\mathrm{b}\mathrm{u}\mathrm{t}\mathrm{y}\mathrm{l}\mathrm{a}\mathrm{n}\mathrm{i}\mathrm{l}\mathrm{i}\mathrm{n}\mathrm{e}$) has been made using conoscopic observation and circularly polarized light. The new phenomen…
We measured optical absorption and magnetic susceptibility of amorphous ${\mathrm{As}}_{2}$${\mathrm{S}}_{3}$ as a function of temperature. An exponential variation of absorption constant with photon energy was found in the range $0.09<\ensuremath{\alpha}<0.5$ ${\mathrm{cm}}^{\ensuremath{-}1}$. A Curie term in t…
The anomalous behaviour of chalcogenide-glass switches, in the thin-film limit, is incorporated into the electrothermal switching model by taking account of both temperature and field dependences of the electrical conductivity. Calculations of the critical field as a function of temperature and thickness are compared…
Abstract The chain‐scission reaction which occurs in copolymers of styrene and acrylonitrile has been studied at temperatures of 262, 252, and 240°C. Under these conditions volatilization is negligible, and chain scission can be studied in virtual isolation. At 262°C three kinds of chain scission are discernible, name…
x-ray line broadening techniques have been used to determine both a - and c -direction crystallite sizes for a range of pyrolytic graphite samples whose effective formation temperature lay between 2330 and 3020°C. x-ray line profiles were analysed using the variance method. It is shown that if the proper allowance is…
Summary The‘precipitated‐calcium/precipitated‐phosphorus’ mole ratio approached a limiting value of 1 as the amount of phosphate, added to a suspension of calcareous soil in 0·01m CaC1 2 , was increased, indicating the precipitation of dicalcium phosphate. The phosphate and lime potentials provided further evidence th…
The moisture responses of plain jersey and 1 X 1 rib fabrics constructed from synthetic fiber-cotton blend yarns have been studied. The fabric responses include water vapor transmission, moisture imbibition, moisture regain, and air permeability. Measurements of the fabric strength and shrinkage are also reported. The…
ABSTRACT Native and cross-linked rat tail tendon collagen was irradiated with high energy electrons up to a maximum dose of 100 × 104 J kg − 1 (100 Mrd). Fibres irradiated dry showed greater damage when examined in the electron microscope using negative staining techniques than those irradiated wet. Cross-linking with…
Electron paramagnetic resonance (EPR) provides a sensitive tool by which microscopic bond rupture can be monitored simultaneously with observations of macroscopic deformation and failure. Past techniques for studying fracture in semicrystalline polymers have been extended to investigate degradation of unfilled ruber i…
Summary Many of the oxides and chalcogenides formed by the 3d transition metals and 4f rare-earth metals are antiferro-, ferri-and ferromagnetic semiconductors. In this review, several theoretical aspects of these materials are discussed, including electron correlation in narrow bands and the formation of electrostati…