Tim Van der Zee

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A sensitive and accurate stable isotope dilution assay was developed for the measurement of pipecolic acid in body fluids using capillary gas chromatography with electron-capture detection. The method utilizes [2H11]pipecolic acid as the internal standard. Sample preparation consisted of derivatization in aqueous solution (pH 11.5) of the amine moiety with(More)
Understanding why and how students interact with educational videos is essential to further improve the quality of MOOCs. In this paper, we look at the complexity of videos to explain two related aspects of student behavior: the dwelling time (how much time students spend watching a video) and the dwelling rate (how much of the video they actually see).(More)
Background: We present the results of a reanalysis of four articles from the Cornell Food and Brand Lab based on data collected from diners at an Italian restaurant buffet. Method: We calculated whether the means, standard deviations, and test statistics were compatible with the sample size. Test statistics and p values were recalculated. We also applied(More)
This study investigates the cumulative effect of (non-)native intonation, rhythm, and speech rate in utterances produced by Spanish learners of Dutch on Dutch native listeners’ perceptions. In order to assess the relative contribution of these language-specific properties to perceived accentedness and comprehensibility, speech produced by Spanish learners(More)
Learning at scale opens up a new frontier to learn about learning. MOOCs and similar large-scale online learning platforms give an unprecedented view of learners' behavior whilst learning. In this paper, we argue that the abundance of data that results from such platforms not only brings novel opportunities to the study of learning, but also bears novel(More)
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