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Viskositäts-Temperatur-Verhalten von Elektrotauchlacken / Viscosity-Temperature Behavior of Electrodeposition Paints
Sacramento da Capo: Fortsetzung des Tagungsberichtes ,67th Annual Meeting of the Society of Rheology" / Sacramento da Capo: Continuation of the Conference Report "67th Annual Meeting of the Society of Rheology"
Firmenseminare / Company Seminars
Neue Normen und Normentwurfe / New Standards and Draft Standards
Rheometrische und tensi ometrische Untersuchungen an lösemittelarmen Lackharzlösungen / Rheometric and Surface Energy Characterization of Varnish Resin Soluti ons with Low Solvent Content
Ticker / Ticker
AULACOSEIRA SKVORTZOWII SP. NOV. (BACILLARIOPHYTA), A POORLY UNDERSTOOD DIATOM FROM LAKE BAIKAL, RUSSIA1
ABSTRACT Aulacoseira skvortzowii sp. nov. is a diatom taxon present in modern plankton assemblages and sedimentary deposits from Lake Baikal, Russia. It has been previously reported as A. islandica (O. Müll.) Simonsen, A. islandica ssp. helvetica (O. Müll.) Simonsen, a sporangial frustule of A. baicalensis (K. Meyer)…
Effect of the Composition of Polypyrrole Substrate on the Electrodeposition of Copper and Nickel
Electrodeposition of copper and nickel on a variety of substrates including conductive polymer films with two different compositions has been studied. The enhancement of the copper and nickel electrodeposition rate was observed for composite polypyrrole films with cation‐exchange properties in comparison to undoped po…
Anionic polymerization of oxirane in the presence of the polyiminophosphazene base t‐Bu‐P4
Abstract The use of the polyiminophosphazene base t ‐Bu‐P 4 (1) for the anionic polymerization of ethylene oxide is described. Polymerization initiated by a monoalkoxide of the protonated base leads to well‐defined poly(ethylene oxide)s with low polydispersity ( M w / M n ≈ 1.1). Furthermore, graft copolymers of poly[…
A single source approach to the synthesis of CdSe nanocrystallites
Synthetic routes to semiconductor nanocrystallites have become of particular interest since nanoparticle devices have been constructed. The route reported here for CdSe uses a single source in tri‐ n ‐octylphosphine oxide instead of the hazardous metal alkyls conventionally employed. The characterization of the nanocr…
Determination of the centroid or `the best centre' of a coordination polyhedron
The geometric parameters related to the point in the coordination polyhedron having the minimum variation of distances to the vertices (`the centroid of the coordination polyhedron') are proposed as a measure of polyhedral irregularity or deformation. The numerical method for the determination of the centroid coordina…
Some Nonionic Surfactants as Inhibitors of the Corrosion of Iron in Acid Chloride Solutions
The inhibition effect of the surfactants 1,2-hexanediol (HD), 1,2,3-octanetriol (OT); 1,2,3-nonanetriol (NT); and 3,7-dimethyl-1,2,3,6,7-octanepentol (DOP) on the corrosion of iron in 1 M hydrochloric acid (HCl) was studied. Results obtained from gravimetric methods showed inhibition efficiencies increased with increa…
EFFECTS OF HARVEST STAGE AND LIGHT ON THE BIOCHEMICAL COMPOSITION OF THE DIATOM THALASSIOSIRA PSEUDONANA1
ABSTRACT The marine diatom Thalassiosira pseudonana (Hustedt, clone 3H) Hasle and Heimdal was cultured under three different light regimes: 100 μmol photon · m −2 · s −1 on 12:12 h light : dark (L:D) cycles; 50 μmol photon · m −2 · s −2 on 24:0 h L:D; and 100 μmol photon · m −2 · s −1 on 24:0 h L:D. It was harvested d…
A new model for {1012} twin growth in hcp metals
Computer simulation has been used to study the interaction of a perfect, basal dislocation with a {1012} twin boundary in a hcp metal for the situation where the 1/3{1120} Burgers vector is inclined at 60° to the interface. It is found that slip is not transferred from one crystal to the other with a residual dislocat…
An Improved Mean Atomic Number Background Correction for Quantitative Microanalysis
Quantitative EPMA (electron probe microanalysis) intensity measurements require an accurate correction for the X-ray continuum (or background) created by the Bremsstrahlung effect from the primary electron beam. This X-ray continuum, as measured on a wavelength-dispersive spectrometer at any particular wavelength, is…
The Correction for Attenuation
This article examines the statistical correction for attenuation and the controversies surrounding the procedure. Although originally developed for test construction purposes, the correction for attenuation is also used in meta-analysis and assessments of validity generalization. Since Spearman's classic article in 19…