The rise in the numbers of pupils identified by schools with autism spectrum disorder (ASD): a comparison of the four countries in the United Kingdom ROY MCCONKEYAn annual school census is held in the four countries of the UK in which pupils with ASD are identified. This longitudinal study of the total UK school population compares increases in prevalence rates for pupils with ASD over a nine-year period from 2010/11. Northern Ireland had the highest prevalence throughout, reaching 3.20% by 2018/19 compared to 1.92% in Wales. The prevalence rates were higher in secondary than in primary schools. The increases in prevalence and intra-country variations may be linked to a greater appreciation of ASD occurring alongside other developmental difficulties. Greater reliance on school rather than statutory assessments may also contribute to increases in pupils with ASD. More in-depth research is needed to establish the reason for the variations across years and countries.

The bubble type, generated by an ultrasonic field, was studied in a batch and flow reactor using a multibubble sonoluminescence (MBSL) quenching technique with propanol and acetone. The influence of frequency and transducer configuration was evaluated using the same piezoelectric element in both setups. Results show that the bubble type not only depends on the frequency, but also on the input power or transducer configuration. Additionally, the effect of flow on sonoluminescence yield and bubble type was studied in the continuous setup at various frequencies. As the flow becomes turbulent, the sonoluminescence signal reaches a plateau for three out of four frequencies, and a transition from transient to stable cavitation occurs for frequencies below 200 kHz.