E. R. Heller

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When placing numbers along a number line with endpoints 0 and 1000, children generally space numbers logarithmically until around the age of 7, when they shift to a predominantly linear pattern of responding. This developmental shift of responding on the number placement task has been argued to be indicative of a shift in the format of the underlying(More)
Navigating the world requires attention to number; however, sets in real-world contexts are rarely homogeneous or presented in isolation, thus the task of determining what constitutes a relevant set for enumeration can be a difficult one. This contextual ambiguity increases the likelihood that irrelevant sets may bias our ability to accurately track number.(More)
Trichothiodystrophy (TTD) is a rare multisystem disorder, characterized by sulfur-deficient hair with alternating dark and light "tiger tail" banding on polarized light microscopy. TTD is caused by mutations in DNA repair/transcription genes XPD, XPB or TTDA, and in TTDN1, a gene of unknown function. Although most of the TTD patients are photosensitive,(More)
AlGaN/GaN HEMTs with a gate length of 0.125 µm were stressed at Class AB condition, 10 GHz under 3 dB compression for up to 350 hours. Devices exhibited excellent RF stability up to a drain bias of 20 V. Rapid degradation was observed for a drain bias of 25 V. Substantial Schottky contact degradation was observed for all three bias conditions.(More)
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