Materials Literature
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Crystalline catalysts of orthorhombic MoO 3 have been prepared via a vapor phase deposition method, and their crystallographic structure has been affirmed by XRD and FTIR investigations. A chemical etching method has been developed for restructuring these thermally processed catalysts. Using a 0.1 M NaOH etchant, {001…
Two series of linear homo- and heterotrinuclear complexes, Mn III M II Mn III and Mn IV M II Mn IV, where M II represents Mn II ( 1 and 5), Ni II ( 2 and 6), Cu II ( 3 and 7), or Zn II ( 4 and 8), containing three dimethylglyoximato dianions (dmg 2 - ) as bridging ligands and 1,4,7-trimethyl-1,4,7-triazacyclononane (L…
Following the complete sequencing of the Escherichia coli genome, it has been shown that the proposed second citrate synthase of this organism, recently described by the authors, is in fact a 2-methylcitrate synthase that possesses citrate synthase activity as a minor component. Whereas the hexameric citrate synthase…
The piezoelectric shear strain S5 of several commercial lead zirconate titanate (PZT) piezoceramics was evaluated under the nonresonant condition in a sinusoidal ac-field E1(t) applied perpendicular to the poling direction. Results obtained on donor doped (soft PZT) and acceptor doped (hard PZT) ceramics are compared.…
Atomic-resolution transmission electron microscope (TEM) images reveal that IIbb (β = 97°) Mg,Al,Fe-chlorite from Koongarra, Australia, transforms to vermiculite via a range of intermediate chemical and structural states. Semi-quantitative analysis of contrast in atomic-resolution images of layer silicates with ∼1.4 n…
The encapsulation (decoration) of Rh nanoparticles supported on a TiO 2 (110) surface was studied by X-ray photoelectron spectroscopy (XPS) and scanning tunneling microscopy (STM). In the case of a stoichiometric and well-ordered TiO 2 (110)-(1 × 1) surface covered by 3 monolayers (ML) of rhodium, there is no indicati…
Comparisons of the predictions of stochastic diffusion kinetic calculations using electron track structures with experimental scavenger data show that the precursor to the hydrated electron, e pre -, plays a role in determining the total yield of electrons scavenged in a number of systems. The significance of e pre -…
This study examines the interaction between water and a range of fabrics because of claims that synthetic fibers such as polypropylene do not pick up moisture and so when made into active wear, leave the wearer warm and dry. We have found that all fiber types, when made into fabrics, pick up water, with a strong corre…
It is shown that the addition of an azimuthal detector rotation to a (2 + 2)-type diffractometer makes it fully equivalent to a z-axis type. Using this equivalence, the geometric correction factors for this (2 + 3)-type diffractometer, which are needed to obtain structure factors from measured integrated intensities,…
The spectral complex optical constants in the visible and the near-infrared region of VO(2) and V(1-x)W(x)O(2) films deposited on glass substrates were determined from observed reflectance and transmittance spectra for which the least-squares method was used. In the metallic phase, the optical properties were characte…
The magnetization and resistivity of single crystals of the Zintl compound ${\mathrm{Eu}}_{14}{\mathrm{MnBi}}_{11}$ are measured as functions of temperature and applied magnetic field. The magnetization data show an apparent antiferromagnetic transition at ${T}_{N}=32\mathrm{K}$ even though the high-temperature suscep…
The interfacial characteristics of SiC/C/SiC composites with different fiber‐coating bond strengths have been investigated using single‐fiber push‐out tests. Previous studies have shown that weak or strong bonds can be obtained by using as‐received or treated fibers, respectively, and that the stress‐strain behavior i…
The dielectric dispersion and influence of a.c. electric field strength on electric permittivity as well as the hysteresis loops for Na0.5Bi0.5TiO3 ceramics were investigated. The dipolar relaxation of Cole—Cole type below 1 MHz is observed. This relaxation significantly evolves with temperature and is connected with…
Effects of hydrogen in alloys on their anodic polarization curves and the dissolution behavior of types 304 and 310 (UNS 30400 and UNS 31000) stainless steels (SS) in 0.5 M sulfuric acid (H2SO4) + 0.1 M hydrochloric acid (HCl) solution were studied. Electrochemical polarization curves obtained from both alloys showed…
The effect of NaCl in combination with and on the atmospheric corrosion of copper was investigated. Corrosion products formed after 4 weeks exposure were characterized qualitatively by X‐ray diffraction and quantitatively by gravimetry and ion chromatography of leaching solutions. Studies of deposition and consumption…
Nucleophilic reactions between mercapto-substituted amphiphiles and carbosilane dendrimers bearing (chloromethyl)silyl groups on their terminal branches gave, in high yields, amphiphilic dendrimers with hydrophobic carbosilane cores and alcohol, dimethylamino, or sodium sulfonate amphiphilic groups at the periphery. T…
Amorphous nitrogenated carbon (a-CN:H) films are prepared from a mixture of methane and nitrogen in an electron cyclotron resonance plasma at a pressure of 2 mTorr and applying a substrate bias of −300 V. Based on the characterization done by x-ray photoelectron spectroscopy (XPS) and Raman spectroscopy on the films c…
Hydro-Quebec's experience with polymer insulators began in 1977. A sixteen km section of a 735 kV transmission line near Quebec City was then re-insulated with 282 composite insulators of three different makes in equal proportions. The objective was to study them under real service conditions in order to evaluate thei…
The isothermal oxidation of pure CVD SiC and Si 3 N 4 has been studied for 100 h in dry, flowing oxygen from 1200° to 1600°C in an alumina tube furnace. Adherent oxide formed at temperatures to 1550°C. The major crystalline phase in the resulting silica scales was alpha‐cristobalite. Parabolic rate constants for SiC w…
Abstract The droplet‐size evolution in polymer blends, due to flow‐driven coalescence, is nvestigated both experimentally and theoretically. In the experiments, preshearing at a high rate is applied to generate a fine morphology in the blend; subsequently, the shear rate is suddenly decreased to induce coalescence, an…