Catalytic Carbon Monoxide Oxidation Using Bio-Templated Platinum Clusters

The catalytic properties of highly dispersed, bacterial surface layer supported nanoscale platinum clusters immobilized at alumina particles are studied with respect to carbon monoxide oxidation. Compared to samples prepared from platinum impregnated alumina, the templated metal clusters are catalytically active at lower temperatures. The catalytic behaviour of the samples is discussed with respect to their cluster morphology studied by TEM.     

Das städtische Mikroklima: Analyse für die Stadt‐ und Gebäudeplanung

In the face of global warming, human thermal comfort has become an increasing important aspect in applied urban planning. As the urban heat island is not a homogenous factor the microclimate conditions play an important role also for single buildings and the situation inside. For a better consideration of this aspect in the planning process, qualitative and especially quantitative assessment tools are required. To get a better knowledge about the quantitative dimension of urban climates investigations on thermal comfort in outdoor and indoor spaces are carried out in selected city quarters in the city of Kassel in Germany. These studies consist of experimental investigations including field interviews about usage of urban open spaces and thermal sensation and numerical simulations on thermal comfort under recent as well as future regional climate conditions. The added‐value of the interdisciplinary research project is based on the correlation of findings from human‐biometeorology with the outcomes from sociologic questionnaires and building physics, which will be used to plan and design structures in a high spatial resolution. The thermal conditions outside continue inside the building, a combination of internal and external climate considerations must be made. The aim of a research at the University of Kassel is the examination and presentation of different microclimate and its influence on the thermal behavior of buildings.     

An Experimental Local PCM-Switching System

This paper discusses a local PCM switching network. The characteristics of this network are demonstrated with a model of three local exchanges. All subscribers are connected with the exchange via concentrators. An exchange is controlled by a central processor with a stored program. This processor interacts with the peripheral switching units, represented by the central switching network and two types of control circuits, located within the exchange. These control circuits control either the concentrators or they communicate with counterparts, situated in other local exchanges. All control functions that are not executed by programs of the central processor are realized by microprograms in a wired read-only storage (ROS) in these peripheral control circuits.