Materials Literature
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Infrared spectra of some poly(methylene terephthalates) and some poly(methylene 2,6-naphthalates) were compared. To interpret the spectral changes during drawing and heat treatment, the concept of rotational isomerism of the O-(CH2)M-O part, which was fairly successful in poly(ethylene terephthalate) (C2T), was trie…
The redox reaction of 1,1′‐diheptyl‐4,4′‐dipyridinium dibromide in water was investigated by means of linear potential sweep voltammetry. It was found that aging of the radical salt film or the occurrence of the second reduction step results in an additional oxidation peak. This additional oxidation peak is accompanie…
The tunnel splitting of the librational ground state of a NH+4 ion in (NH4)2 SnCl6 has been analyzed by ’’incoherent’’ inelastic neutron scattering. Ground state splittings of 2.96±0.04 and 1.51±0.03 μeV have been observed at T=6 K and are interpreted as transitions between A?T and T?E spin symmetry states, respective…
Dipole oscillator strength distributions (DOSDs) have been constructed for ground state Li, N, O, H 2 , N 2 , O 2 , NH 3 , H 2 O, NO, and N 2 O by using experimental and theoretical photoabsoiption and high energy electron inelastic scattering cross sections. Each DOSD is required to satisfy the Thomas–Reiche–Kuhn sum…
Abstract In most low‐strength applications, plastics offer cost, maintenance, and density advantages over metals. Major deficiencies of plastics, however, are low thermal and electrical conductivities. Various studies have dealt with these problems, and it has been found that thermal conductivity and electrical conduc…
Abstract The intensity distribution of the N K‐emission band of hexagonal boron nitride samples with partially oriented crystallites is found to be strongly dependent upon the take‐off angle of the emitted radiation. The obserbed emission bands can be separated unambiguously into a σ‐ and a ‐subband. On the basis of t…
Abstract Amorphous hydroxides of Al, Fe, Mn, Mg, Zn, Co, Ni, etc., are capable of coprecipitating SiO 2 even from very dilute (weathering) solutions. Silica minerals form only in those precipitates from solutions undersaturated with respect to amorphous silica (100 ppm SiO 2 at 20°C). With higher SiO 2 concentrations…
An electric-field-induced cholesteric-nematic transition on a sample containing a europium chelate guest molecule of little or no polarization shows contrast ratios as high as 9 : 1 for its brilliant red (612 nm) fluorescence.
Coefficients of linear thermal expansion are reported, in the range 60 K to room temperature, for eight optical materials: Polytran potassium chloride and Polytran calcium fluoride-Harshaw; chemical-vapor-deposited (CVD) zinc sulfide and zinc selenide-Raytheon; germanium (single-crystal and polycrystal); crystalline m…
Raman scattering in single crystals of ${\mathrm{V}}_{2}$${\mathrm{O}}_{3}$ has been studied in the range from \ensuremath{\sim}20 K to room temperature. Metal to insulator, crystallographic, and antiferromagnetic-ordering transitions take place concurrently at ${T}_{t}\ensuremath{\sim}150$ K. The observed spectra sho…
Charge transfer between two insulators, or between a metal and an insulator, is not influenced by previous identical contacts. Since it has recently been shown that material transfer occurs to a large extent on the first contact and to a much smaller extent on subsequent contacts, it can be concluded that material tra…
Abstract A mixing‐reaction model (MIRE) is used to develop criteria, readily accessible by experiment, which permit the chemist to decide whether and when mixing effects influence the product distribution in competitive consecutive or parallel reactions. The validity of these criteria is demonstrated by comparison of…
Radial expansion and subsequent fracture into segments of thin-walled cylindrical shells at large initial strain rates are studied analytically and experimentally. The theory of probability along with a description of relief wave propagation away from each fracture is used to formulate a theory which predicts the numb…
This book is intended to be both an advanced basic text and a state-of-the-art compendium on both clinical and research aspects of electrocochleography. It meets these aims of the editors very well indeed, except where a two-year delay in publication prevents a complete update. The collection of papers and discussions…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCloso boron hydrides with 13 to 24 boron atomsLeo D. Brown and William N. LipscombCite this: Inorg. Chem. 1977, 16, 12, 2989–2996Publication Date (Print):December 1, 1977Publication History Published online1 May 2002Published inissue 1 December 1977https://pubs.acs.org/doi/1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHomogeneous nucleation and glass formation in aqueous alkali halide solutions at high pressuresH. Kanno and C. A. AngellCite this: J. Phys. Chem. 1977, 81, 26, 2639–2643Publication Date (Print):December 1, 1977Publication History Published online1 May 2002Published inissue 1…
Abstract Polarisationsversuche an rotierenden Scheibenelektroden zeigten daß die Korrosion von unlegiertem Stahl (Werkstoff Nr. 1.1623) in sauerstoffreien Kohlensäurelosungen nicht durch Transportvorgänge, sondern durch kathodische Aktivierungspolarisation kontrolliert wird. Die gegenüber verdünnten Mineralsäuren glei…
Summary Kerolites from Goles Mountain (Yugoslavia), Wiry (Poland), Madison Co. (North Carolina), and Kremze (Czechoslovakia) are compared with talc and stevensite. Chemical analyses give a composition for kerolite near R 3 Si 4 O 10 (OH) 2 . n H 2 O with R mainly Mg and n about 0·8–1·2. Infra-red data and dehydration-…
Abstract The transport coefficients of macromolecular solutes are normally extrapolated to “infinite dilution” to remove the effects of concentration‐dependence terms, for which no satisfactory general treatment has been available. It is shown that a simple general treatment for the concentration‐dependence effect can…
The electrical and optical properties of rf-sputtered Sn-doped In2O3 (ITO) films have been found to depend strongly on the O2 partial pressure during deposition. For the sputtering conditions used, films with both low electrical resistivity (ρ ∼ 3 × 10−4 Ω cm) and high visible transmission (∼ 90%) were obtained only o…