LED建筑物景观照明设计综述（上）

本文详细论述了LED建筑物景观照明设计中的主要问题。     

Auslegung keramischer Präzisionsgleitlager mit textiler Verstärkungskomponente

Design of ceramic high‐accuracy bearings containing textile fabrics In order to determine the thermo‐elastic behaviour of slide bearings with a bearing sleeve of textile structured ceramic matrix composites (CMC), a new method for computation of the material properties of the composite material was implemented. Therefore a small cut‐out from the regular fabric structure was discretised with the finite element method (FEM). The woven rowings were thereby regarded as unidirectional long‐fiber‐reinforced composites, for which assured calculation methods are available. Additionally pores can be considered in the model. The computed material properties were examined and used as input data for a further FEM‐Model describing the slide bearing with CMC sleeve. By means of this model the thermo‐elastic behaviour of the bearing is determined. The main problem using CMCs as bearing surface (bearing sleeve) in a steel box are the different thermal coefficients of expansion. During the warm up phase the outline of the bearing surface changes. Applying constructional changes based on the simulation the dissipation loss of the bearing sinks substantially and the bearing is prevented from galling.     

Enhanced performance of microbial electrolysis cells using microstructured electrodes

A microbial electrolysis cell is set up with the purpose to realize an efficient power-to-gas process. Both hydrogen production by electrolysis and biomethanization proceed in the same reactor cell. In particular, the formation of hydrogen bubbles is strongly governed by the surface properties of the used stainless steel electrodes. Here, we introduce surface topography modifications on the micron-scale to enhance the electrical transport in the cell and support charge conversion into hydrogen. Furthermore, it is analyzed if hydrogen bubble detachment can be supported to form smaller bubbles that can be efficiently converted into methane. A positive influence on the electrical transport is found and explained by a surface-controlled suppression of bio-film passivation.