The pitfalls of enjoying the electronics game: or The case for an interdisciplinary science of psychoengineering: Comment on the special issue on instrumentation in psychology.

Encourages more psychologists to seek collaboration with engineers. Occasionally psychologists have spent substantial time and funds only to reinvent techniques, methods, and electronic instruments that were common knowledge to skilled engineers, but were unknown to the psychologists. (0 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Chiroptical Properties of Phorbol-12, 13, 20-triacetate and Some Other Phorbol Derivatives

The CD spectra of phorbol and of some of its derivatives, such as its 12, 13, 20-triacetate 1, show at least four bands. Three of them (called I, III, and IV) correspond to the R-, K-, and (perhaps) second n → π*-transition, respectively, of the enone system; the fourth band around 260 nm (band II) is of π → π*-origin and could be ascribed to an interaction of the lone pair of electrons on the oxygen atom at C(4) with the C=C-C=O system. The signs of the R-band as well as the K-band Cotton effects are very sensitive to chemical modifications around the chromophoric system in the cyclopentenones investigated. The absolute configuration of phorbol may be derived from the CD spectra of some of its derivatives, and, in particular, from the application of the “dibenzoate rule” to 12, 13-di-O-benzoyl phorbol-20-acetate (4).     

Electrochemiluminescence of rubrene at a zinc oxide electrode

The electrochemiluminescence (ecl of rubrene at a zinc oxide electrode has been studied with regard to the possibility of the formation of excited species via a heterogeneous electron-transfer reaction. Electrochemiluminescence has actually been observed, the spectrum of which coincides with the fluorescence spectrum of rubrene. However, the emitted light does not occur at potentials where rubrene radical cations are reduced but at potentials where radical anions are formed at the ZnO electrode. From this fact it is concluded that the emission observed originates from homogeneous electron transfer between radical cations and anions but not from formation of excited species via heterogeneous electron transfer. On the base of an energy diagram derived from the flat-band potential of ZnO in contact with a non-aqueous electrolyte and from electrochemical and photochemical data of rubrene the underlying processes are discussed qualitatively.     

Entwicklung einiger mathematischer digitaler Winderhitzermodelle – Zweidimensionale Modelle

Forderungen an die mathematischen Winderhitzermodelle. Berücksichtigung der Wandverluste durch eine Wärmedurchgangszahl der Wandverluste. Annahmen und Differentialgleichungen der ein- und zweidimensionalen Winderhitzermodelle. Zwei verschiedene Lösungswege für das Differentialgleichungssystem des zweidimensionalen Winderhitzermodells.     

Die Entschwefelung über die Gasphase bei der Stahlerzeugung im Lichtbogenofen

Stoffbilanzen beim Einblasen von Feststoffen mit Sauerstoff in Stahlschmelzen. Ermittlung verschiedener Einflüsse auf die Entschwefelung über die Gasphase. Nachweis des Schwefels in der Gasphase als COS.     

Polyimides as precursors for artificial carbon

The pyrolysis behavior of different commercially available polyimides has been studied by means of thermoanalysis, dilatometry and analysis of the gaseous pyrolysis products. Based on the results of these measurements the chemistry of the thermal degradation is discussed. The carboneous residues have been investigated by X-ray, nitrogen adsorption and elemental analysis. The polyimides were successfully applied as binder precursor for C/C-composites.