The 198Au beta-half-life in the metal Au revisited

The half-life of the beta-decay of 198Au has been measured for room temperature and 12 K. The resulting values of T(RT) = 2.684 +- 0.004 d and T(12 K) = 2.687 +- 0.005 d agree well within statistical uncertainties. An evidence for a temperature dependence of the half-life was not observed.Comment: accepted for publication in Eur. Phys. J.

Messungen an Kühlturmfahnen Teil 3: Dreidimensionale Vermessung von Kühlturmfahnen

In this paper an extended field experiment is described in which cooling tower plumes were investigated by means of three-dimensional in situ measurements. The goal of this program was to obtain input data for numerical models of cooling tower plumes. Of special interest were data for testing or developing assumptions for sub - grid parametrizations. Utilizing modern systems for high-resolution aerology and small aircraft four measuring campaigns were conducted: two campaigns (1974) at the cooling towers of the RWE power station Neurath and also two (1975) at the single cooling tower of the RWE power station Meppe . Because of the broad spectrum of weather situations it can be assumed that the results are representative with regard to the interrelationship between structure of cooling tower plume and large -scale meteorological situation. A large number of flights with a powered glider ASK 16 (more than 100 flight hours) crossing the plumes on orthogonal tracks was performed. All flights showed that the plume could be identified up to large downwind distances by discontinuous jumps of temperature and vapour pressure. Therefore a definite geometry of the plume could always be defined. In all cross sections a vertical circulation could be observed. At the plumes boundary which could be defined by the mentioned jumps of temperature and vapour pressure a maximum of downward vertical motion could be observed in most cases. Entrainment along the boundary of a cross section seems to be very small, except at the lower part of the plume. There, the mass entrainment is maximum and is responsible for plume rise as well as for enlargement of the cross section. The visible part of the plume (cloud) was only a small fraction of the whole plume. The discontinuities of temperature and vapour pressure show that the plume fills the space below the visible plume down to the ground. However, all effects decrease rapidly approaching the ground. It turned out that high-resolution aerology is necessary in order to explain the structure and behaviour of such plumes. This is especially the case in investigations regarding the dynamic break-through of temperature inversions. Such cases were observed quite frequently under various meteorological conditions and are described in this paper

Messungen an Kühlturmfahnen Teil 4: Ergebnisse von Meßkampagnen an den Kühltürmen der RWE-Krafiwerke Neurath und Meppen

A review of the meteorological measurements at plumes of different cooling towers managed by the "Institut für Physik der Atmosphäre (DFVLR Oberpfaffenhofen) " in four measurement campaigns is given in this paper. The meteorological measurements have been accomplished as part of a more extended programme "Microclima of Cooling Towers". The theoretical and technical base of these field experiments have already been presented in part 3 of this set of reports. Out of the great, number of measuring results two complete sets of datas are exemplarily picked out. In the general part of this paper function and utilization of the measurement equipment is described. The progress of the measurement campaign achieved by the co-operation between different systems of measurement equipment is described. In the appendix the measuring results of two days of the campaign are presented completely. The possibility of using these datas is stated for those who are interested