Materials Literature
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Phonon dispersion relations in ${\mathrm{Cu}}_{2}$O have been studied at 20\ifmmode^\circ\else\textdegree\fi{}C using inelastic neutron scattering. Seven acoustic branches and twelve optical branches have been studied in detail in the three symmetry directions [$00\ensuremath{\zeta}$], [$\ensuremath{\zeta}\ensuremath{…
We approximate liquid water as a lone-pair amorphous semiconductor. Since electronic orbital times are short compared to the periods of atomic and molecular motion, properties dependent on electronic states can be interpreted to determine short-time intermediate range order. An anomalous temperature dependence of the…
Using molecular dynamics techniques, low temperature properties of a 500-particle amorphous system of Lennard-Jones particles have been studied. The system was prepared by rapid quenching of an originally liquid sample. The structural properties are similar to those of random close-packed hard spheres. Propagating lon…
Vibrational modes of trigonal Se and Te are analyzed to determine the character of the interchain (secondary) forces. The dispersion of low-frequency modes clearly demonstrates the directional (covalent) character of these forces. The interference of secondary interactions with the intrachain (primary) bonding is evid…
The authors have calculated defect energies for MgO using both a simple central-force shell model and the central-force breathing shell model proposed by Sangster (1973). Such an extension is required to account for the large Cauchy violation C 44 >>C 12 found for this material. A critical comparison has been made of…
Abstract A series of resol‐type phenol‐formaldehyde resins was investigated by infrared spectroscopy and differential scanning calorimetry. The molar ratio of phenol to formaldehyde was determined from the absorbance ratio D 1010 /D 1610 . Differences between the reactivities of resins were confirmed by the molar phen…
Synthetic titanomagnetites ((1−x)Fe3O4, - xFe2TiO4, 0 ≤ × ≤ 0.6) were prepared by the ceramic oxide method and the equilibrium atmosphere method, and two size fractions were separated out. The first contained particles of size >150 μm, while the second, which was ground in a water slurry, had a mean particle size of a…
Abstract In early 1969 I was invited by the then Minister of Technology to be Chairman of a committee to investigate and assess the cost per annum in the U. K. of corrosion and the means available for its alleviation. We had the services of a small secretariat seconded from the United Kingdom Atomic Energy Authority,…
Transient hole transport in $a$-Se below 180 K is shown to be a stochastic process. The transition from the well-defined high-temperature transport with Gaussian dispersion to the low-temperature stochastic transport is not paralleled by a change in the activation energy of the hole drift velocity.
<div class="htmlview paragraph">The effect of combustion time and combustion variability on performance and emissions was investigated with a single cylinder CFR spark ignition engine using gaseous fuel (propane). A system was developed which allowed the collection of the products of combustion of individual eng…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochemistry of 2,2,4,4-tetraphenyloxetan-3-one. Intermediates in the photofragmentation of aryl substituted oxiranesJ. P. Wasacz, M. M. Joullie, U. Mende, I. Fuss, and G. W. GriffinCite this: J. Org. Chem. 1976, 41, 3, 572–574Publication Date (Print):February 1, 1976Publi…
An energy analyser of the uniform magnetic sector type has been built for a 100 kV conventional transmission electron microscope (CTEM), which is equipped with a scanning transmission (STEM) attachment. The analyser has an energy resolution of 2.5 eV and does not degrade the STEM spatial resolution. It is intended pri…
Article Changes of Excess Free Energies in the Crystal Growth Processes of Calcite and Aragonite Due to the Presence of Mg2+ Ions in Solution was published on February 1, 1976 in the journal Zeitschrift für Physikalische Chemie (volume 99, issue 4-6).
Magnetoresistance measurements on single crystals of holmium are reported for the helical antiferromagnetic and conical ferromagnetic phases. Longitudinal and transverse measurements were made with the magnetic field applied in the $a$, $b$, and $c$ planes, including nine different field-current configurations. Data w…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structure of a condensed phosphatosilicate, oxovanadium(IV) diphosphatomonosilicate, VO(SiP2O8)Catherine E. Rice, William R. Robinson, and Bruce C. TofieldCite this: Inorg. Chem. 1976, 15, 2, 345–348Publication Date (Print):February 1, 1976Publication History Publish…
A scanning-laser-induced voltage (SLIV) technique is used to obtain a high-resolution map or image of the thermovoltage at the surface of thin films of high-melting-point transition metals. The image is produced by displaying, on a cathode ray tube, the surface thermovoltage produced by a pulsed laser beam scanned acr…
The moisture-related properties of a series of cotton-polyester blend broadcloths and sheetings were investigated. The composition of the broadcloth ranged from all-cotton to 68% polyester and 32% cotton, and the sheeting varied from all-cotton to 50% polyester and 50% cotton. The moisture properties measured were dro…
Ceric ammonium nitrate, in aqueous acetic acid buffered with sodium acetate, rapidly oxidizes 2,2′-dipyrromethanes to the corresponding 2,2′-dipyrroketones.
A single measurement of twist is insufficient to typify open-end yarns because the twist (tpi) of the fibers comprising the yarn core is different from those comprising the outer sheath, and both are usually lower than the machine value. The differences may be expressed in terms of a twist gradient which is a function…
The tautomerism of phenylpyruvic acid (PPA) and its sodium salt was investigated. The 1H and 13C spectra of PPA in aprotic solvents and in methanol show almost complete prevalence of the enol form, whereas the keto form prevails only in water. The Z configuration was assigned to the sole enol tautomer present on the b…