Can airborne ultrasound monitor bubble size in chocolate?

Aerated chocolate products consist of solid chocolate with the inclusion of bubbles and are a popular consumer product in many countries. The volume fraction and size distribution of the bubbles has an effect on their sensory properties and manufacturing cost. For these reasons it is important to have an online real time process monitoring system capable of measuring their bubble size distribution. As these products are eaten by consumers it is desirable that the monitoring system is non contact to avoid food contaminations. In this work we assess the feasibility of using an airborne ultrasound system to monitor the bubble size distribution in aerated chocolate bars. The experimental results from the airborne acoustic experiments were compared with theoretical results for known bubble size distributions using COMSOL Multiphysics. This combined experimental and theoretical approach is used to develop a greater understanding of how ultrasound propagates through aerated chocolate and to assess the feasibility of using airborne ultrasound to monitor bubble size distribution in these systems. The results indicated that a smaller bubble size distribution would result in an increase in attenuation through the product

The application of ultrasonic NDT techniques in tribology

The use of ultrasonic reflection is emerging as a technique for studying tribological contacts. Ultrasonic waves can be transmitted non-destructively through machine components and their behaviour at an interface describes the characteristics of that contact. This paper is a review of the current state of understanding of the mechanisms of ultrasonic reflection at interfaces, and how this has been used to investigate the processes of dry rough surface contact and lubricated contact. The review extends to cover how ultrasound has been used to study the tribological function of certain engineering machine elements

Fern spore extracts can damage DNA

The carcinogenicity of the vegetative tissues of bracken fern (Pteridium) has long been established. More recently, the carcinogenic effects of the spores of bracken have also been recognized. Both vegetative tissues and spores of bracken can induce adducts in DNA in animal tissues, but the possible genotoxic or carcinogenic effects of spores from fern species other than bracken are unknown. The single-cell gel electrophoresis (‘comet’) assay was used to investigate whether fern spores can cause DNA damage in vitro. Extracts of spores from six fern species were administered to cultured human premyeloid leukaemia (K562) cells. Spore extracts of five fern species: Anemia phyllitidis, Dicksonia antarctica, Pteridium aquilinum, Pteris vittata and Sadleria pallida, induced significantly more DNA strand breaks than those in the control groups. Only in one species, Osmunda regalis, was the effect no different from that in the control groups. Using extracts from A. phyllitidis and P. vittata, the extent of DNA damage was increased by increasing the original dose 10 times, whereas an experiment in which exposure times were varied suggested that the highest levels of strand breaks appear after 2 h exposure. Simultaneous incubation with human S9 liver enzyme mix ablated the damaging effect of the extracts. Our data show that fern spore extracts can cause DNA damage in human cells in vitro. Considering the strong correlation between DNA damage and carcinogenic events, the observations made in this report may well have some implications for human health. © 2000 Cancer Research Campaig

A women’s worker in court: A more appropriate service for women defendants with mental health issues?

Aims Court liaison services aim to reduce mental illness in prison through early treatment and/or diversion into care of defendants negotiating their court proceedings. However, liaison services may inadvertently contribute to gender inequalities in mental health in the prison system. This is because women often do not access liaison services. This is attributed to services failing to recognise that women have different needs from men. To address this, it is essential that the needs of women in contact with the criminal justice system (CJS) are clearly articulated. However, there is a dearth of research that considers women’s needs at this stage of their journey through the CJS. This paper aims to identify these needs before women enter prison. It does so through an analysis of a pilot Women’s Support Service based at a Magistrates’ Court, a response to concerns that women were not accessing the local liaison service. Characteristics of women defendants attending the service are described, specifically their home environments, general and mental health needs. Their support needs when in contact with the CJS and the links the service must forge with local community organisations to provide this, are also presented. This knowledge will develop/ tailor existing services available to women defendants to improve their access to these and optimise the benefits they can derive from them. Methods Proformas were completed by a women specialist worker for 86 women defendants assessed in 4 months. Information was collected on characteristics including education, domestic violence, accommodation, physical and mental health.. This specialist worker recorded the range of needs identified by defendants at assessment and the services to which women were referred. Results Access to the Women’s Support Service is high, with only 11.3% of women refusing to use the service. Women attending have high levels of physical and mental health issues. Their mental health issues have not being addressed prior to accessing the service. Women often come from single households and environments high in domestic abuse. Women have multiple needs related to benefits, finance, housing, domestic abuse, education and career guidance. These are more frequent than those that explicitly link to mental health. The women’s worker providing the service referred women to 68 services from a wide variety of statutory and voluntary organisations. Conclusions The Women’s Support Service is accessed by a higher number of women, many more than access the local liaison service. It is suggested that this is due to their multiple and gender specific needs being adequately addressed by the former service and the organisations to whom they are referred. Mental health needs may also be secondary to other more basic needs, that makes the generic service provided but the Women’s support Service more appropriate than a liaison service that deals with mental health support alone