Materials Literature
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Thin films of VOxFy were made by rf magnetron sputtering of V in Ar+O2+CF4. They were analyzed by Rutherford backscattering spectrometry and transmission electron microscopy. Optical and electrical properties changed within narrow temperature ranges. These results resemble those of thermochromic VO2, although VOxFy ha…
Abstract Reductions in tin coatings and thickness of tinplate affect the properties of the tinplate surfaces. Computer‐aided electrochemical test methods, impedance spectroscopy and X‐ray microanalytical studies show that corrosion behaviour is influenced by the base material properties. This paper will give some info…
This paper describes some of the results of a two and a half year, Congressionally-mandated effort to identify cigarettes with properties that would reduce their propensity to ignite soft furnishings (upholstered furniture and mattresses). For this purpose, the ignition propensities of 41 specially designed and 5 pate…
Abstract Tetrakis(1H,1H-perfluoroethyl) titanate, Ti(OCH2CF3)4, tetrakis(1H,1H-perfluoropropyl) titanate, Ti(OCH2CF2CF3)4, tetrakis(2,2,2-trifluoro-1-methylethyl) titanate, Ti[OCH(CH3)CF3]4, tetrakis(2,2,2-trifluoro-1,1-dimethylethyl) titanate, Ti[OC(CH3)2CF3]4, tetrakis((1H,1H,3H-perfluoropropyl) titanate, Ti(OCH2CF2…
Abstract The crystal structures of glycyl-l-alanine hydrobromide monohydrate, 1, and glycyl-l-alanine hydroiodide monohydrate, 2, were determined and the temperature dependence of the 127 I NQR frequencies was investigated in the temperature range 77 <̳T/K <̳ 370. The 127 I NQR frequencies are strongly influence…
Abstract The Pace–Datyner theory for diffusion of penetrant molecules in polymers has been analyzed. It has been found that the correct solution of the problem they pose is possible only at 0 K, since then the separation of two chains at x = ∞ is equal to the minimum of the DiBenedetto potential for their interaction.…
Abstract In alkaline electroless copper solutions with formaldehyde as reducing agent, side reactions between formaldehyde and hydroxide occur. In solutions of formaldehyde and sodium hydroxide below 70°C the only reaction found is the Cannizzaro reaction. The rate constant of this reaction was determined at different…
The two-dimensional Coulomb gas is studied in a particular case where the positive charges (or ``ions'') are smeared over disks of radius \ensuremath{\sigma}, and held fixed on the sites of a triangular lattice, while the opposite point charges (the ``electrons'') move freely in the periodic field of the ions. At low…
Abstract Hemin was solubilized in neutral and acidic aqueous solutions by complexing with poly(N-vinylpyrrolidone) (PVP), polyethylene glycol (PEG), poly(vinyl alcohol) (PVA) and dextran. In neutral aqueous solutions, hemin in the PVP, PEG, and PVA complexes was monomeric and that in the dextran complex was dimeric. T…
Abstract In the examination by scanning electron microscopy of hair and polyester fabric that had been shot with a 9-mm pistol at muzzle-to-target distances from 10 to 70 cm, it was discovered that part of the gunshot residue (GSR) deposited on the target is molten at impact. Impact of these molten GSR particles resul…
A review is given on the structural phase transition of hexagonal type BaTiO3 at 222 K and on the ferroelectric · ferroelastic phase transition at ∼ 70 K. X-ray studies and Raman studies have disclosed that an E2u phonon mode condenses below 222 K where crystal changes from hexagonal P63/mmc to orthorhombic C2221-D5 2…
A generalized approach based on numerical evaluation of the Fourier coefficients is used to determine the performance of three-phase phase-controlled thyrode AC voltage controllers. Balanced resistive and inductive loads of different power factors are considered. Various electrical properties are computed and compared…
We have investigated orientational behaviors of nematic liquid crystals of phenylcyclohexane derivatives and their solutions of Ti(OBu)4—AlEt3 catalyst under a magnetic field by means of optical transmission measurements. Magnetic field required to achieve an ultimate orientation of the liquid crystal is found to be 1…
Abstract The structures of conglomerate crystals, p-chlorobenzenesulfonic acid salt of l-alanine, p-toluenesulfonic acid salt of l-serine, and benzenesulfonic acid salt of l-leucine, were determined by X-ray analysis. The crystals are built up of repeating units consisting of two amine components and two acid componen…
The field dependence of magnetization, which is a serious handicap for a straightforward application of magnetizable materials in the process of basic field correction, is discussed. The principles for compensation of this dependence by an appropriate choice of magnetic material, the operating point on the hysteresis…
Abstract Thermosetting resins composed of triarylmethane structure were prepared by heating a mixture of a polycyclic aromatic compound and an aromatic aldehyde in the presence of an acid catalyst. The resin prepared from the mixture of pyrene and terephthalaldehyde exhibited scarcely any weight loss up to 530 °C unde…
Abstract Basic aluminium chloride gels and the crystalline salt AlCl 3 · 2 Al(OH) 3 · 6 H 2 O are thermally decomposed to an amorphous product in a first step at low temperatures. If the reaction gas is rapidly removed the amorphous decomposition product directly transforms to corundum at increased temperature. Starti…
An ultrastructural study of the embryonic and larval shell of Anodonta cygnea was carried out by light, polarization, and scanning electron microscopy, and X-ray diffraction analysis. A thin outer layer (cuticle), composed of β-keratin fibrils organized in parallel rows and enveloped by chitin material, was observed.…
The presence of degenerate graphite in heavy section ductile iron causes a significant decrease in its mechanical properties. In this paper, two types of degenerate graphite are classified: large non-spheroidal graphite and small chunky graphite. The formation processes of degenerate graphite have been investigated by…
We report experimental results on the kinetics of the electron-beam-induced reduction of WO3 by in situ high-resolution electron microscopy. Electron-beam irradiation of WO3 results in complete reduction to W. The process is surface-initiated through desorption of oxygen from the crystal surface, and the subsequent gr…