Structurally bound water and surface characterization of amorphous silica
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The novel mixed-valence, exchange-coupled, class III dimer [L 2 Fe 2 (µ-OH) 3 ] 2+ (L =N,N′,N″-trimethyl-1,4,7-triazacyclononane)
The reaction of Fe(CIO4)2·6H2O with N,N′,N,″-trimethyl-1,4,7-triazacyclononane (L) in methanol affords, in the presence of a small amount of oxygen, the deep blue binuclear complex [L2Fe2(µ-OH)3](CIO4)2·2MeOH·2H2O which was characterized by EXAFS, e.s.r., u.v.-visible and Mössbauer spectroscopy to be a mixed valence i…
Kinetics of the thermal decomposition of methoxybenzene (anisole)
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of the thermal decomposition of methoxybenzene (anisole)J. C. Mackie, K. R. Doolan, and P. F. NelsonCite this: J. Phys. Chem. 1989, 93, 2, 664–670Publication Date (Print):January 1, 1989Publication History Published online1 May 2002Published inissue 1 January 1989ht…
Crystal Rotations Represented as Rodrigues Vectors
Rodrigues vectors are explored as a means of representing crystal orientation distributions. Relationships between the Rodrigues vectors and several more commonly utilized representations of rotations are presented. The restrictions which cubic material symmetry imposes on the Rodrigues space are examined and relation…
THE NUCLEATION OF MICROCELLULAR FOAMS IN SEMI CRYSTALLINE THERMOPLASTICS∗
The nucleation of microcellular foams in amorphous thermoplastics has been performed by supersaturation with gas at an elevated temperature. Pressure and temperature are then carefully reduced in the vicinity of the glass transition temperature of the material. The result is a foam structure with cells on the order of…
Control of charging in low‐voltage SEM
Abstract Charging of the specimen under electron beam irradiation is a common problem in scanning electron microscopy (SEM). It results in unstable imaging conditions and a loss in resolution due to defocus of the beam. In addition, it can cause permanent changes in some specimens from translocation of mobile ions und…
Tilings and patterns : an introduction
Tilings and Patterns: An Introduction presents in convenient paperback form the first half of Tilings and Patterns. Omitting the more specialized material of the earlier volume, this abbreviated edition make's the authors' contributions to tiling theory and its practical applications accessible to a wide audience. Til…
Starting of large motors-methods and economics
The authors evaluate the available starting methods for motors above 3000 HP, focusing on technical and economic aspects. The following starting schemes are discussed: direct online, reactor, autotransformer, capacitor, captive transformer, and frequency start. A review of the network conditions that favor a particula…
Ellipsometric studies of polyaniline growth and redox cycling
Ellipsometry has been used to characterise the growth of polyaniline films on platinum and gold electrodes by potential cycling. Analysis of the time evolution of the ellipsometric parameters allowed continuous monitoring of the growth process, and subsequent measurements of the changes in optical properties during ox…
Electrostriction of the cholesteric blue phases BPI and BPII in mixtures with positive dielectric anisotropy
The electrostriction of the cubic blue phases was investigated in the well known mixture CB15/E9. The results for BPI prove that a decrease of the lattice constant in the field direction with increasing field strength can occur in a system with positive dielectric anisotropy. In agreement with recent theoretical consi…
Morphological characteristics of the orthorhombic martensite in a shape memory Ti-Ni-Cu alloy.
Morphological characteristics of the orthorhombic martensite in a Ti–Ni–Cu shape memory alloy have been investigated and the following have been found:(1) In the cubic (B2) to orthorhombic transformation of the Ti–Ni–Cu alloy, no lattice invariant shear is needed. This is due to the fact that one of the principal dist…
The Performance of High-Temperature Reactor Fuel Particles at Extreme Temperatures
Coated particles embedded in graphitic elements are the fuel for the High-Temperature Reactor (HTR). Experimental investigations of the performance of particles at extremely high temperatures have been conducted to achieve an understanding of coating failure mechanisms and to establish the data base for safety and ris…
Tensile Stress-Strain Properties of Sifcon
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Effects of geomagnetically induced currents in the BC Hydro 500 kV system
Measurements are presented of increased harmonic currents in a 500 kV power system due to geomagnetically induced currents (GIC). The measurements were made of 60 Hz, 120 Hz, and 180 Hz currents and GIC in a 1200 MVA transformer. The recorded increases in the harmonic currents at times of GIC are consistent with compu…
Fine structure of point defects and soliton decay in nematic liquid crystals
On the basis of Landau-de Gennes-theory it is demonstrated that point defects in nematic liquid crystals may have a biaxial nonsingular core. From this result a critical diameter is derived for linear topological solitons in nematics. Solitons of smaller diameter can relax to the uniform nematic state without energy b…
The Theoretical Fundamentals of the Screen Printing Process
The basic parameters of screen printing are discussed, and an analytical model of the screen printing process is introduced. The ink roll in front of the squeegee is treated as a pump generating, close to the squeegee edge, high hydrostatic pressure which injects ink into the screen meshes. The shearing of the ink, th…
Collagens of Normal and Cirrhotic Human Liver
The collagens of normal and end-stage alcoholic cirrhotic human liver were investigated. Mild conditions of pepsin digestion were employed to preserved the more pepsin sensitive type IV collagen molecules while increasingly more harsh conditions were used which solubilized the type I and type III hepatic collagens. Th…
Chemistry of (.mu.-dithio)bis(tricarbonyliron), an inorganic mimic of organic disulfides. 3. Reaction with low-valent metal compounds and some interesting isolobal analogies involving the products
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemistry of (.mu.-dithio)bis(tricarbonyliron), an inorganic mimic of organic disulfides. 3. Reaction with low-valent metal compounds and some interesting isolobal analogies involving the productsMartin Cowie, Roger L. DeKock, Timothy R. Wagenmaker, Dietmar Seyferth, Richard…
Influence of Moisture on Corrosion of Pipeline Steel in Soils Using In Situ Impedance Spectroscopy
The interrelationships between the corrosion rate of pipeline steel and soil parameters have been investigated under both controlled laboratory and natural outdoor conditions. Both defect-(holiday)-free, polyethylene-coated samples and samples with intentional 1-cm2 holiday areas were studied. By using electrochemical…
On the stability and bonding in bis(η-arene)ianthanide complexes
Cocondensation of atoms of the lanthanide elements with 1,3,5-tri-t-butylbenzene gives the thermally stable bis(η-arene)lanthanide(0) sandwich compounds for the lanthanides Nd, Tb, Dy, Ho, Er, and Lu, thermally unstable complexes for La, Pr and Sm, and unisolable materials for Ce, Eu, Tm, and Yb; a simple bonding mode…