Materials Literature
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Enthalpies of proton dissociation δHa of poly(acrylic acid) at three different temperatures have been determined as a function of the degree of dissociation α. Despite the apparent increase in pKa with increasing α, the enthalpy of proton dissociation decreases with increasing α, reaching an almost constant value arou…
Developmental changes in the fine structure of the posterior silk gland cells were studied with a recessive mutant of Bombyx mori named flimsy cocoon (flc) whose cocoon-shell weight is much less than that of the normal strain of B. mori. The flc posterior silk gland develops normally until 60 h after the fourth ecdysi…
The synthesis of UN from UO2 through carbide by oxide-carbide-nitride process has been studied in an NH3 stream and a mixed H2 and N2 stream at temperatures 1,400-1,750° C. Uranium mononitride is produced from the carbide by the following four stages: (1) deposition of free carbon, (2) deposition and removal of free c…
Thick film conductors based on Al, Cu and Ni have been studied. Because of its high depth of field, a SEM was used to study the microstructures of the fired conductors. Because of the very small size of the particles in commercial Cu pastes the neck growth forms part of the grain growth mechanism. The bonding between…
The experimental literature on the phase equilibria of the Al-Fe-Ni system has been reviewed. Recommended projections of the solid-liquid equilibria are based upon a compromise between experimental data for the isothermal contours and established points for binary and ternary invariant reactions. The nature of the equ…
Zinc amalgam or electrochemical reduction of porphyrinatoniobium(V) oxide acetates leads to porphyrinatoniobium(IV) oxides, which are characterized by their e.s.r., i.r., and u.v.–vis. spectra.
Abstract Upon ultraviolet irradiation azobenzene and decafluoroazobenzene in cyclohexane and diethyl ether solutions decompose into phenylazo, phenylazomethylene and aniline radicals. The major products formed in cyclohexane solution are N ‐cyclohexylaniline, N ‐cyclohexylpentafluoroaniline, phenylazocyclohexane, pent…
The dynamic tensile modulii E' of cold-drawn and subsequently annealed polypropylene film samples were measured as a function of annealing temperature. The modulus E' at 23°C along the draw direction was found to decrease with an increase in the annealing temperature, but the degree of crystallinity of the samples bec…
Inelastic neutron scattering experiments have been performed upon the rhombohedral phase of Pb3 (P0,95V0,05.O4)2. The soft mode, observed at the L point of the rhombohedral Brillouin zone is found to belong to an acoustic anomalously low frequency phonon branch. A central peak is evidenced and investigated. The study…
The compatibility of SiC-coated carbon fiber with aluminum was investigated. The carbon fiber was coated with SiC by chemical vapour deposition. The elastic modulus and the tensile strength of the carbon fiber increased after the SiC coating treatment.The compatibility of carbon fiber with aluminum was assessed by str…
The effects of alloying elements on the atmospheric corrosion of stainless steel, the results of exposure tests in different environments in Japan and the evaluation methods of atmospheric corrosion resistance were discussed.
Dynamic viscoelastic properties of composite systems composed of polybutadiene particles and polystyrene melts have been measured. The temperature dependence of a viscoelastic function is well expressed by the WLF equation. The rubbery plateau modulus is less dependent of the particle content and the molecular weight…
ABSTRACT Treatment of either of the stable anhydrous crystalline forms of or‐lactose with potassium methoxide in methanol at reflux does not result in the formation of β‐lactose, whereas the latter is formed from α‐lactose monohydrate or hygroscopic anhydrous α‐lactose under these conditions. We find that when β‐lacto…
Electron spin resonance has been used for the study of the radical in gamma-irradiated single crystals of 5'-UMP (sodium salt). Six types of radicals have been identified at room temperature. They are formed by addition of H atoms to C5, C6, 02 and 04, and by an OH addition to C5 of the uracil ring. Five of these radi…
Abstract Single crystals of Sr 2 Ti 6 O 13 were prepared by heating a mixture of SrO·Ti 2 O 3 ·2TiO 2 in a vacuum furnace to 1800 °C for 6 hours. X-ray investigations show monoclinic symmetry (a = 1525,0, b = 376,9, c = 916,4 pm; β = 99,15°, space group C 3 2h -C2/m). Sr 2 Ti 6 O 13 is isotypic with Ba 2 Ti 6 O 13 .
Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text K. D. Cummings and D. B. Tanner, "Far-infrared ordinary-ray optical constants of quartz," J. Opt. Soc. Am. 70, 123-126 (1980) Export Citation BibTex En…
A series of [2.4]cyclophanetetraenes and closely related compounds has been shown to undergo reversible two-electron reduction at a mercury electrode in dimethylformamide solution. The cyclophanes which contain a conjugated periphery of 4nπ-electrons, thus being formally antiaromatic hydrocarbons, form dianions of pro…
The rates of hydrogen desorption from liquid iron and several liquid binary iron alloys were measured by the carrier gas method using argon. The results obtained are summarized as follows.1. The rate of hydrogen desorption from liquid iron is governed by a first order reaction for hydrogen content in iron.2. The rate…
Abstract The clay and sand mineralogy of old (possibly 750 000 years) rhyolitic tephras of two sections located in south‐west and west Waikato, New Zealand, has been investigated by X‐ray diffraction, differential thermal analysis, infrared spectroscopy, transmission electron microscopy, and the polarising microscope.…
Abstract The crystal structures of two lithium nickel borides were determined by single crystal X-ray investigations. Li 3 Ni 20 B 6 (cubic, Fm3m, a = 1047.8 pm, Z = 4) crystallizes in the Cr 23 C 6 structure type with partly random distribution of lithium and nickel. The centers of the cubo-octahedra are statisticall…