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The narrative coherence of witness transcripts in children on the autism spectrum
Background and Aims. Autistic children often recall fewer details about witnessed events than typically developing children (of comparable age and ability), although the information they recall is generally no less accurate. Previous research has not examined the narrative coherence of such accounts, despite higher quality narratives potentially being perceived more favourably by criminal justice professionals and juries. This study compared the narrative coherence of witness transcripts produced by autistic and typically developing (TD) children (ages 6-11 years, IQs 70+).
Methods and Procedures. Secondary analysis was carried out on interview transcripts from a subset of 104 participants (autism=52, TD=52) who had taken part in a larger study of eyewitness skills in autistic and TD children. Groups were matched on chronological age, IQ and receptive language ability. Coding frameworks were adopted from existing narrative research, featuring elements of ‘story grammar’.
Outcomes and Results. Whilst fewer event details were reported by autistic children, there were no group differences in narrative coherence (number and diversity of ‘story grammar’ elements used), narrative length or semantic diversity.
Conclusions and Implications. These findings suggest that the narrative coherence of autistic children’s witness accounts is equivalent to TD peers of comparable age and ability
Helicopter low-speed yaw control
A system for improving yaw control at low speeds consists of one strake placed on the upper portion of the fuselage facing the retreating rotor blade and another strake placed on the lower portion of the fuselage facing the advancing rotor blade. These strakes spoil the airflow on the helicopter tail boom during hover, low speed flight, and right or left sidewards flight so that less side thrust is required from the tail rotor
Electrically tuneable exciton-polaritons through free electron doping in monolayer WS microcavities
We demonstrate control over light-matter coupling at room temperature
combining a field effect transistor (FET) with a tuneable optical microcavity.
Our microcavity FET comprises a monolayer tungsten disulfide WS
semiconductor which was transferred onto a hexagonal boron nitride flake that
acts as a dielectric spacer in the microcavity, and as an electric insulator in
the FET. In our tuneable system, strong coupling between excitons in the
monolayer WS and cavity photons can be tuned by controlling the cavity
length, which we achieved with excellent stability, allowing us to choose from
the second to the fifth order of the cavity modes. Once we achieve the strong
coupling regime, we then modify the oscillator strength of excitons in the
semiconductor material by modifying the free electron carrier density in the
conduction band of the WS. This enables strong Coulomb repulsion between
free electrons, which reduces the oscillator strength of excitons until the
Rabi splitting completely disappears. We controlled the charge carrier density
from 0 up to 3.2 10 cm, and over this range the Rabi
splitting varies from a maximum value that depends on the cavity mode chosen,
down to zero, so the system spans the strong to weak coupling regimes.Comment: Accepted for publicatio
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