Schwingungserscheinungen in Chemieanlagen

Vibrational phenomena in chemical plant. This article draws on the practical experience of the author to provide a survey of vibrational problems in chemical plant and of their sources. Even though it is not always possible to eliminate all potential sources of vibration by appropriate calculation and design measures during the planning stage, they can usually be quickly identified subsequently by suitable measuring techniques and countermeasures adopted.     

Some optimal policies for management of wildlife

Using a linear programming model, we present some numerical results on optimal policies for management of wildlife populations. The results suggest that simultaneous harvest and addition to the herd is not generally economical.In this paper, we develop a model to control harvested wildlife populations. Some numerical results on optimal policies for control are presented. These results suggest that simultaneous harvesting and addition to the herd may be less preferred than either a harvest or addition policy alone.     

The Effects of Heat Treatments of Germanium on Resistivity, Photoconductive Decay and on Lithium Drift Properties

The effects of heat treatments on resistivity, photoconductive decay and Lithium drift properties of p-type germanium single crystals have been investigated. We found that, in contrast to literature thermally produced acceptors cannot be reconverted if vacuum is used instead of a gas during "anneal" treatments. Vacuum heat treatments also lead to a stronger decrease of the photoconductive decay time than a gas atmosphere does. Close to theoretical Lithium drift rates considerably decrease in heat treatments, poor drift rates can be improved. The effects of quenching differs distinctly from those of slow cooling. The surface exposed to vacuum can be assumed to be a more abundant source of single vacancies due to a lower density of sorption engagements. Single vacancies diffuse then rapidly into the bulk and become less mobile in interactions, possibly with (interstitial) copper, thus providing stable p-sites.     

Über alkalisch vernetzbare polymerisate mit reaktiven chlormethylcarbonyl-gruppen

Copolymers containing reactive compounds are cross-linkable under the influence of heat and shifting of the pH. In practice reactive groups, e. g. methylol-compounds, are mostly used, which react under the influence of acids. However cross-linking agents for alkaline media are often demanded. In the group of examined monomers with chloroacetic-groups olefinically unsaturated N-(chloroacetamidomethyl)-carboxylic amides show good cross-linking agent properties in their copolymers. Emulsions of these polymers have proved to be particularly suitable for use as binders for textile, leather, and paper.     

Die Vorbereitung der Probenoberfläche und ihr Einfluß auf das Ergebnis der Elektronenstrahl-Mikroanalyse

Modellversuche und Untersuchungen an Zweistoffsystemen und technischen Legierungen zur Feststellung der Beeinflussung der Mikrosondenanalysen durch verschiedene Ätzverfahren. Prüfung der Anwendbarkeit von Interferenzaufdampfschichten.