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International audience; Various Yb ion, Sr lattice and Cs fountain clocks at INRiM, LNE-SYRTE, NPL and PTB had been compared simultaneously over a 3-week campaign using satellite-based techniques. With full 20 MChip/s modulation bandwidth TWSTFT links and PPP/iPPP analysis of GPS link data,instabilities of a few 1E-16 could be achieved for both techniques. For the calculation of the clock-to-clock ratios and their uncertainties, gap-tolerant weighted averaging with differentoptimized weighting functions was employed.

Re-contouring in the repair process of aircraft engine blades and vanes is a crucial task. Highest demands are made on the geometrical accuracy as well as on the machined surface of the part. Complexity rises even more due to the unique part characteristic originating from the operation and repair history. This requires well-designed processes and machine tool technologies. In this paper, approaches for coping with these challenges and improving the re-contouring process are described and discussed. This includes an advanced process simulation with its capabilities to accurately depict different material areas and predict process forces. Beyond, experimental investigations on workpiece-tooldeflection are presented. Finally, a machine tool prototype with a novel electromagnetic guiding system is introduced and the benefits of this technology in the field of repair are outlined. DFG/CRC/871

Internationally infrastructure is ageing rapidly and there is increased utilisation of infrastructure due to urbanisation and globalisation. Significant amounts are invested globally to address this issue, although funding fluctuates from year to year. One response to this situation is to position the construction industry with advanced technological solutions. However, the construction industry is renowned for low levels of innovation and the South African government has also underfunded research into infrastructure. There is a need to stimulate innovation in the construction industry to develop the uniquely South African technological solutions required to provide and maintain economic and social infrastructure. An investment in construction innovation should be based on a review of the current state of construction technology and the industry and an analysis of the drivers and trends that will shape the future construction industry landscape. Technology foresight studies are recognised as one way to determine the future factors that will influence a specific economic sector. This article describes a new approach to conducting a technology foresight study within the South African construction industry. The methodology, as well as initial results from it, is reported. A review is provided of the current state of the construction industry and its potential drivers and trends. Future work will include scenario development and the development of pathways and interventions to take the industry forward from its current position to a desired future state.