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The fingerprint character and high sensitivity of 3D
UV-vis fluorescence spectra offer special advantages for identification of
dyes in a museum or forensic setting. However, the extraction process is likely
to affect the pH of the medium and, in some cases, may alter the dye itself. We
report a study of 65 dyes extracted from wool fibers that are part of the
Schweppe Collection of Important Synthetic Dyes. The 3D fluorescence spectra of
the dye extracts at pH 1 and pH 14 are compared with the same dyes from the Schweppe solution
library, run under the same conditions, as well as with the 3D fluorescence
spectra of the dyes taken directly from the solution library without pH
control. This analysis leads to guidelines for the use of such spectra in
identifying unknown dye samples.
This study looks at how people rate specific non-verbal cues (NVC) with
regard to the presence and persuasiveness of the speaker. The first study (N =
1500) was conducted to attempt to isolate specific non-verbal signals (hands
and feet) that were related to ratings on influence and persuasiveness. In the
second study, over 600 people rated a high quality video of an actor speaking.
A sex by age by race by NVC ANOVA on six ratings, a total score and a question
about voting showed a very consistent pattern with strong main effects for NVC,
especially in ratings of confidence and persuasiveness. There were few
significant interactions. Implications for training public speakers are
considered. Limitations of the research are also noted.