19 research outputs found
Patterns in German /ʃC/-cluster acquisition
This study reports on the developmental patterns of /ʃC/ clusters in 145 normally developing monolingual German-speaking children between 2;00 and 2;11. All children completed a picture naming task to allow a systematic qualitative analysis of the production patterns. Children’s reductions of target /ʃC/clusters are examined and are evaluated with respect to two models, ‘factorial typology’ and ‘headedness’, to account for them. The results reveal expected patterns of C2 retention for ‘/ʃ/+[−continuant]’ (e.g. ‘/ʃ/+stop’ and ‘/ʃ/+nasal’) targets, and a rather indeterminate pattern for /ʃl/ and /ʃʁ/. The results for /ʃv/, a clear-cut preference of C2 retention, were rather unexpected, as the C2 is a [+continuant]. The explanation offered for the retention of /v/ is related to a place constraint. The study also examines the data from children who reached an advanced stage of cluster formation with differential targets. More specifically, in several children, one target, /ʃv/, is found to have stayed behind in the reduction phase while all others have advanced to the ‘cluster stage’. Neither the type nor the token frequencies seem satisfactory in accounting for the specific behaviour of /ʃv/. The explanation offered for the uniqueness of this target may be its non-abidence to the Sonority Sequencing Principle (SSP) because of its flat sonority and the Obligatory Contour Principle (OCP) [continuant], because of the unchanging ‘continuance’ which is demanded by the OCP. Theoretical and clinical implications are discussed
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Modelling the AGN broad line region using single-epoch spectra - I. The test case of Arp 151
We show that individual (single-epoch) spectra of active galactic nuclei (AGNs) can constrain some of the geometry and dynamics of the AGN broad line region. Studies of the cosmic influence of supermassive black holes are limited by the current large uncertainties in the determination of black hole masses. One dominant limitation is the unknown geometry, dynamics, and line-of-sight inclination of the broad line region, used to probe the central black hole mass. Recent progress has been made to constrain the spatial and kinematic structure of the broad line region using dynamical modelling of AGN monitoring data and an underlying physical model for the broad line region. In this work we test the ability of a modified version of this dynamical modelling code to constrain the broad line region structure using single-epoch spectra.We test our modelling code on single-epoch spectra of nearby Arp 151 by comparing our results with those obtained with monitoring data of this same object. We find that a significant fraction of the broad line region parameters can indeed be adequately constrained, with uncertainties that are comparable to, or at most a factor of approximately a few higher than those obtained from modelling of monitoring data. Considering the wealth of available single-epoch spectroscopic observations, this method is promising for establishing the overall AGN population trends in the geometry and dynamics of the broad line region. This method can be applied to spectra of AGNs at low and high redshift making it valuable for studies of cosmological black hole and AGN evolution