Materials Literature
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Hydroplaning potential of pavement is defined as the inability of the accumulated water to escape from the tire-pavement contact area. The potential is measured in terms of the speed above which hydroplaning occurs; that is, the vehicle tires are lifted off the pavement and supported by a water wedge formed between ti…
Diffusion coefficients of hydrogen in the Group V transition metals, i. e. vanadium, niobium and tantalum, and those in vanadium alloys containing chromium, iron, niobium and titanium were measured in the temperature range of 500∼1100°C by the absorption method. The following results were obtained:(1) Diffusion data a…
Pure RMgH compounds have been prepared, as stable tetrahydrofuran solutions at room temperature, by the reaction of the corresponding R2Mg compound with an active form of MgH2 in THF; in this way MeMgH, EtMgH, PriMgH, and CpMgH have been prepared and characterized (Cp = cyclopentadienyl).
The Vk centre in halide crystals is often described in terms of an X2− molecule ion. Recent molecular calculations for the halogen molecule negative ions have enabled a detailed comparison to be made between the theoretical anion and the results from optical and spin resonance studies on the crystals. The optical abso…
The liquidus temperature of the Al2O3-Nd2O3 system was measured from the cooling curve of specimens by the specular reflection method with a heliostat type solar furnace. Quenched specimens from the melt were examined by X-ray diffraction technique, petrographic microscopy and chemical analysis.The single phase of NdA…
Article Thermodynamic and Kinetic Investigation of the Thermal Isomerization of Cis-azobenzene was published on January 1, 1977 in the journal Zeitschrift für Physikalische Chemie (volume 107, issue 1).
Abstract A new quantitative X‐ray diffraction technique has been developed by examining the theoretical basis of X‐ray diffraction originally outlined by Alexander and Klug. The new technique is based on the assumption that all components are identifiable and are to be analysed for, and avoids the use of internal stan…
Experiments were performed in an attempt to make thin n+ contacts on high-purity germanium by the solid phase1 epitaxial regrowth of arsenic doped amorphous germanium. After cleaning the crystal surface with argon sputtering and trying many combinations of layers, it was not found possible to induce recrystallization…
The phase transition between the isotropic and the anisotropic phase of the hard plate fluid has been described by the numerical solutions of the Onsager virial approximation theory. The results are presented in a phase diagram which indicates regions of stability for each phase. The model results may be used to descr…
When the organic precursors to coke and manufactured graphite (petroleum and coal-tar pitches) are carbonized, large, flat, polynuclear aromatic molecules are formed by the reactions of aromatic polymerization. As the molecular weights approach 1500, usually near 450 C, the molecules condense to form a liquid crystal…
The stress-induced ferroelectricity in KTa${\mathrm{O}}_{3}$ is investigated by means of Raman scattering at 2 K. In the (010)-stress-induced ferroelectric phase, the transverse soft ${A}_{1}$, ${B}_{1}$, and ${B}_{2}$ modes have been observed as a first-order Raman scattering and are found to increase their frequenci…
The temperature dependence of the magnetic circular dichroism spectrum of matrix-isolated [Fe(CO)4] shows that the molecule is paramagnetic.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCritical Permeation Size of Dextran MoleculesW. HallerCite this: Macromolecules 1977, 10, 1, 83–86Publication Date (Print):January 1, 1977Publication History Published online1 May 2002Published inissue 1 January 1977https://pubs.acs.org/doi/10.1021/ma60055a016https://doi.org…
Studies were made with an artificial pit in the side of a flow channel to determine quantitative hydrodynamic effects on pitting rate. Experiments were conducted under potentiostatic conditions with iron, titanium, and aluminum in chloride, bromide, and iodide solutions. Two modes of pitting were observed: (1) a high…
Abstract New iron(III) complexes containing quadridentate Schiff bases, [Fe(L)AB]n+, were prepared, where H2L represents a quadridentate Schiff base, and A and B, unidentate ligands, such as imidazole, pyridine derivatives, and cyanide ions. The magnetic moments of the complexes are in the range of 1.9–6.0 B.M. at roo…
Abstract
The flashover characteristics of pressboard, polycarbonate, polyphenylene oxide, Permali and Perspex have been measured under ramp function pseudoimpulse voltage application conditions in clean, dry, degassed liquids with permittivities varying over the range εr = 2–5. The solid materials were tested in the form of 5×…
Nyerereite has the idealized composition (Na 0.82 K 0.18 ) 2 Ca(CO 3 ) 2 with significant minor substitution of SO 4 2− , PO 4 3− , F − for CO 3 2− , optical properties α = 1.5112, β = 1.5333, γ = 1.5345, 2 V α = 29°, and density 2.541 g cm −3 . The average unit cell has space group Cmc 2 1 , dimensions a = 5.044, b =…
Conference International Conference on Non-Aqueous Solutions, International Conference on Non-aqueous Solutions, ICNAS, Non-aqueous Solutions , Fifth, University of Leeds, England, 1976-07-05–1976-07-09 Published Online: 2009-01-01 Published in Print: 1977-01-01 © 2013 Walter de Gruyter GmbH, Berlin/Boston
The structure of NaTaO3 has been determined from X-ray powder diffraction spectra by measuring the intensities of the difference reflexions caused by the deviations from the ideal cubic perovskite structure. The structure is compared with that determined on the basis of single-crystal measurements.