Evaluation of Autoclave Induced Expansion of Some Iowa Carbonate Rocks

An autoclave environment of 110°C and a steam pressure of 25 psi. was used to develop a rapid method of determining the expansive characteristics of some carbonate rocks. The current procedure for such determinations requires several weeks treatment of the aggregate sample in a lN NaOH solution at room conditions. Application of the autoclave method indicates that the rate of expansion is greatly increased but that the actual mechanism of expansion is not changed. Only those samples placed in an alkaline solution in the autoclave expanded. Control samples in distilled water showed negligible expansion. The expansion data obtained by the autoclave method is correlative with that obtained by standard procedures, but the test time required is considerably less. Therefore, this rapid autoclave method is suggested as a valid and applicable test in the study of carbonate aggregates

Production studies, transformations in children’s television and the global turn

Moving away from the dominant discourse of US experience, this article looks at how the production of local content for children remains a central issue in many parts of the world, in spite of the growth of transnational media and the apparent abundance of content for children worldwide. Drawing on a pre-summit workshop on Children’s Content at the Core of Public Service Media, held at the 2014 World Summit on Media for Children, it considers the lack of academic perspectives on production, before exploring with workshop participants the regulatory and funding frameworks for quality children’s content, and the conditions for their successful implementation. There is a continuing problem about producing sustainable children’s content, and western models are not always the most appropriate at providing solutions, which need to be nuanced and tailored to different national, regional and local contexts

Measurement of Physical and Chemical Changes Induced During Weathering of A Carbonate Rock Unit

Changes which occurred during weathering of the Iowa Falls Member of the Mississippian Hampton Formation at Iowa Falls, Iowa were investigated quantitatively. The physical properties measured were: a) compressive strength, b) pore sized distribution, c) porosity and d) permeability. Chemically determined calcite and dolomite contents are related to the physical changes by utilization of an extensive sample sequence. The following changes are shown to be associated with the weathering process: 1) pore space and the degree of its interconnectedness increases with weathering, 2) calcite and dolomite are leached out during weathering, and 3) the rate of removal of calcite is twice that of dolomite

'Surely the most natural scenario in the world’: Representations of ‘Family’ in BBC Pre-school Television

Historically, the majority of work on British children’s television has adopted either an institutional or an audience focus, with the texts themselves often overlooked. This neglect has meant that questions of representation in British children’s television – including issues such as family, gender, class or ethnicity - have been infrequently analysed in the UK context. In this article, we adopt a primarily qualitative methodology and analyse the various textual manifestations of ‘family’, group, or community as represented in a selected number of BBC pre-school programmes. In doing so, we question the (limited amount of) international work that has examined representations of the family in children’s television, and argue that nuclear family structures do not predominate in this sphere

“I'm from Europe, but I'm not European”: Television and children's identities in England and Bulgaria

This is an Accepted Manuscript of an article published by Taylor & Francis in Journal of Children and Media on 5/11/2012 available online: http://wwww.tandfonline.com/10.1080/17482798.2012.740416This article examines the role television (TV) plays in the development of primary school children's European knowledge and identities in England and Bulgaria. It compares the media coverage on Europe and the European Union with pupils' European perceptions and identities. The article reports data from 174 qualitative interviews with children and the content analysis of seven TV programmes. It concludes that TV plays a strong role in collective identities when a topic is salient on the agenda. TV raises awareness and knowledge and sets the direction of understanding. Yet, despite the higher salience of Europe on the Bulgarian media agenda, Bulgarians feel less European than English children. The article provides an explanation to this phenomenon, thus filling an important gap in the literature about the media's role in collective identities formation from an early age. It also adopts an innovative approach in the study of agenda-setting theory by investigating its application among children

Media events and cosmopolitan fandom:"Playful nationalism' in the Eurovision Song Contest

Academic literature on media events is increasingly concerned with their global dimensions and the applicability of Dayan and Katz's (1992) theoretical concept in a post-national context. This paper contributes to this debate by exploring the Eurovision Song Contest as a global media event. In particular, we employ a perspective from 'inside the media event', drawing upon empirical material collected during the 2014 Eurovision final in Copenhagen and focusing on the experiences of fans attending the contest. We argue that the ESC as a media event is experienced by its fans as a cosmopolitan space, open and diverse, whereas national belonging is expressed in a playful way tied to the overall visual aesthetics of the contest. However, the bounded and narrow character of participation render this cosmopolitan space rather limited

In their own words: what bothers children online?

In an open-ended survey question to European 9- to 16-year-olds, some 10,000 children reported a range of risks that concern them on the internet. Pornography (named by 22% of children who mentioned risks), conduct risk such as cyber-bullying (19%) and violent content (18%) were at the top of children’s concerns. The priority given to violent content is noteworthy insofar as this receives less attention than sexual content or bullying in awareness-raising initiatives. Many children express shock and disgust on witnessing violent, aggressive or gory online content, especially that which graphically depicts realistic violence against vulnerable victims, including from the news. Video-sharing websites such as YouTube were primary sources of violent and pornographic content. The findings discussed in relation to children’s fear responses to screen media and the implications for the public policy agenda on internet safety are identified

Imagination and narrative : young people's experiences

Imagery generation in dramatized audio drama is still poorly understood with the majority of work having been done from a radio advertising perspective. This study sought to understand audio drama imagery generation by using teenage listeners. The study demonstrated that teenagers can follow purely auditory narrative with ease and can generate unique and vivid imagery through aural dramatic stimulation. The study also showed that listening in the dark and as a group are appealing for audiences

Adolescent Religiosity and Selective Exposure to Television

Relying on the Adolescent Media Practice Model and selective exposure theory, this study investigated whether religious adolescents watch less mature television entertainment programs than their less religious peers. Program maturity was measured using V-chip ratings, with higher maturity scores indicating content that included more sexuality, violence, and/or adult and sexual language. The responses from 1,335 16- to 18-year-olds who completed Wave 2 of the National Study of Youth and Religion (NSYR) survey were analyzed. Findings indicate that religiosity contributes to explaining the variance in television maturity means, with more religious adolescents indicating a preference for less mature television entertainment. Gender, race, income, and parents’ monitoring of teens’ media were also found to influence television maturity. Teens’ attitudes toward premarital sex appeared to mediate the effect of religiosity on their television entertainment choices

How and Why Parents Guide the Media Use of Young Children

Abstract Children use electronic screens at ever younger ages, but there is still little empirical research on howand why parents mediate this media use. In line with Vygotsky’s zone of proximal development, we explored whether children’s media skills and media activities, next to parents’ attitudes about media for children, and several child and parent-family characteristics, predicted parental mediation practices. Furthermore, we investigated children’s use and ownership of electronic screens in the bedroomin relationship to the child’s media skills. Data from an online survey among 896 Dutch parents with young children (0–7 years) showed that children’s use and ownership of TV, game consoles, computers and touchscreens, primarily depended on their media skills and age, not on parent’s attitudes about media for children. Only touchscreens were used more often by children, when parents perceived media as helpful in providing moments of rest for the child. In line with former studies, parents consistently applied co-use, supervision, active mediation, restrictive mediation, and monitoring, depending on positive and negative attitudes about media. The child’s media skills andmedia activities, however, had stronger relationshipswith parental mediation styles, whereas age was not related. Canonical discriminant analysis, finally, captured how the five mediation strategies varied among infants, toddlers, preschoolers, and early childhood children, predominantly as a result of children’s media skills, and media activities, i.e., playing educational games and passive entertainment use