On real-time word problems

It is proved that the word problem of the direct product of two free groups of rank 2 can be recognised by a 2-tape real-time but not by a 1-tape real-time Turing machine. It is also proved that the Baumslag–Solitar groups B(1,r) have the 5-tape real-time word problem for all r != 0

Investigation of smooth wave fronts using SLM-based phase retrieval and a phase diffuser

A phase retrieval technique using a spatial light modulator (SLM) and a phase diffuser for a fast reconstruction of smooth wave fronts is demonstrated experimentally. Diffuse illumination of a smooth test object with the aid of a phase diffuser (maximum phase shift, Df = 0.85p) results in a significant diversity in the intensity measurements which, in turn, is beneficial for a non-stagnating iterative phase reconstruction. The use of the SLM enables accurate and fast speckle intensity recording and active correction of misalignments in the setup. The effectiveness of the technique is demonstrated in the optical testing of lenses.Comment: The paper has been presented in 1st EOS Topical Meeting on Micro-and Nano-Optoelectronic Systems, Bremen, Germany, 7 - 9 December 201

The Impact of Terminal Values and Yellow Press on Consumer Behavior

We investigate if pluralistic consumption styles (like "frugality", or "indulgence in luxury") can be identified and are correlated with different terminal values and if values and consumption styles prove to be stable or can be changed by drastic events. The results of two polls (before and after the war in Iraq) are compared. Using content analyses, media influence on consumers' values and consumption patterns is also analyzed. Marketing relevance of the research is substantiated by investigating whether values and/or specific consumer trends have a significant impact on the preference of advertising campaigns showing different lifestyle themes. --