Liquid crystal VAN tilt bias by surface relief patterning

Liquid Crystal Displays require controlled alignment of the liquid crystal molecular director at its confining surfaces. These surfaces may be coated glass or in the case of 'Liquid Crystal On Silicon' (LCOS) technology, a silicon backplane. In the case of Vertically Aligned Nematic (VAN) cells an initially vertical orientation is used and from this the director may tilt in any direction. Some means is required to bias the tilt in a consistent direction to avoid the occurrence of differently oriented domains. For VAN cells one tilt bias method is oblique deposition of silicon oxide. An alternative method which eliminates concerns over consistency of deposition angle over a large substrate area is the use of surface relief structures to induce tilt bias. This is attractive for LCOS devices. Liquid crystal modelling tools [1] have been used to simulate the effects of rectangular and triangular shaped 'bumps' and 'dips' protruding from and extending into the LC's enclosing surfaces respectively. The director orientation and optical transmission of the LC pixels biased in this way are examined as a function of time during the switching cycle and spatially across the pixel to show that the combination provides controllable tilt bias

Protecting against school-based victimisation: the role of children's friendship

Given the detrimental short- and long-term effects of peer-victimisation (Hawker & Boulton, 2000), it is not surprising that bullying has become a central topic for multiple parties; including stake-holders, the media, educators, and researchers. In addition to examining the effect that peer-victimisation can have on a child, researchers have also focused on associated risk and protective factors (e.g., Ttofi & Farrington, 2012) that exacerbate or ameliorate the effects of peer-victimisation respectively. Over the last few decades a wide-range of risk and protective factors have been identified, including poor academic achievement (Spriggs, Iannotti, Nansel, & Haynie, 2007), mental health issues (Sourander, Helstelä, Helenius, & Piha, 2000; Yang, Kim, Kim, Shin, & Yoon, 2006), exposure to child abuse and domestic violence (Bowes et al., 2009) and lack of parental involvement (Shields & Cicchetti, 2001). The following chapter will focus on one protective factor that has received increasing attention: friendship. This chapter will begin by briefly presenting an overview as to the function of friendship in childhood before discussing evidence that suggests for some children, friendship can serve to protect against the experience of victimisation, and alleviate symptoms associated with peer-victimisation. In particular, the chapter will focus upon the different facets of friendship including: (1) the number of friends a child has, (2) the quality of these friendships, and (3) the individual characteristics of friends. The extent to which each of these three facets of friendship serve as a protective factor against peer-victimisation will be explored in turn. Paradoxically, friendship does not always function as a protective factor, but rather a child can be bullied by their friends. The 'darker' side of friendship will also be discussed, including why some children choose to stay friends with their perpetrator. Finally, this chapter will debate the effectiveness of peer support programs in schools and highlight areas that require further empirical focus

The Genetic Basis of Phenotypic Heterogeneity in the Neuronal Ceroid Lipofuscinoses

The neuronal ceroid lipofuscinoses (NCLs) are a group of inherited neurodegenerative disorders that affect children and adults. They share some similar clinical features and the accumulation of autofluorescent storage material. Since the discovery of the first causative genes, more than 530 mutations have been identified across 13 genes in cases diagnosed with NCL. These genes encode a variety of proteins whose functions have not been fully defined; most are lysosomal enzymes, or transmembrane proteins of the lysosome or other organelles. Many mutations in these genes are associated with a typical NCL disease phenotype. However, increasing numbers of variant disease phenotypes are being described, affecting age of onset, severity or progression, and including some distinct clinical phenotypes. This data is collated by the NCL Mutation Database which allows analysis from many perspectives. This article will summarise and interpret current knowledge and understanding of their genetic basis and phenotypic heterogeneity

Older adults' experiences and perceptions of digital technology: (dis)empowerment, wellbeing, and inclusion

As more and more of the business of society is transferred and conducted online, older adults frequently find themselves without the skills to participate effectively. This is frequently confounded by limited physical mobility and a decrease in their social network and contact. This paper examines the lived reality of that process and how digital technology could be used to enhance the life activity of older adults and their wellbeing by increasing their social network. Seventeen older adults (10 female, 7 male Mage = 71.67, SDage = 10.05) participated in two focus groups that each lasted approximately 90 min. Interpretative phenomenological analysis yielded two main themes: digital technology serving as a tool to disempower and empower. Findings support evidence of a digital divide and how that divide is evolving from the ideographic perspective of digitally-engaged older adults and for society. Discussions also surround barriers to digital technology use for older adults, the codification of digital technology use within society, and how older adults use digital technology in a facilitative and inclusive way to empower themselves and protect them from the negative effects of the digital divide

We are safe but you are not: exploring comparative optimism and cyber bullying

Individuals tend to believe that when comparing themselves to others they are less vulnerable to potential risks. This is referred to as comparative optimism, whereby individuals believe that they are immune from negative experiences that can happen to others. The current study examined comparative optimism judgements for the likelihood of experiencing cyber bullying. Comparative optimism was examined in three age groups: older adolescents (n = 130, 57% female, Mage = 16.82, SDage = .38), emerging adults (n = 355, 92% female, Mage = 19.26, SDage = .27), and adults (n = 147, 66% female, Mage = 33.24, SDage = 9.77). All participants reported the likelihood that they, their friends, other students [forum users] younger than them, other students [forum users] their age, people older than them, and strangers would experience cyber bullying. Participants displayed an optimistic bias, reporting that they were less likely to experience cyber bullying than others. However, the relative risk of experiencing cyber bullying varied according to comparator group. Comparator groups that were socially close to the participants (e.g. friends) were generally rated as less likely to experience cyber bullying than socially distant comparator groups (e.g. strangers). Also, comparator groups that were younger than the participants were consistently judged to be most at risk of experiencing cyber bullying. Together, the findings have implications for the design of anti-cyber bullying interventions and campaigns to promote digital safety

Effect of the early-life nutritional environment on fecundity and fertility of mammals.

The early-life developmental environment is instrumental in shaping our overall adult health and well-being. Early-life diet and endocrine exposure may independently, or in concert with our genetic constitution, induce a pathophysiological process that amplifies with age and leads to premature morbidity and mortality. Recently, this has become known as 'programming' but is akin to 'maternal effects' described for many years in the biological sciences and is defined as any influence that acts during critical developmental windows to induce long-term changes in the organisms' phenotype. To date, such delayed maternal effects have largely been characterized in terms of susceptibility to cardiovascular or metabolic disease. Here, we review evidence from experimental animal species, non-human primates and man for an effect of the early-life nutritional environment on adult fecundity and fertility. In addition, using a database of pedigree sheep, we also specifically test the hypothesis that being born small for gestational age with or without post-natal growth acceleration directly programmes fertility. We conclude that there is a lack of compelling evidence to suggest pre-natal undernutrition may directly reduce adult fecundity and fertility, but may exert some effects secondarily via an increased incidence of 'metabolic syndrome'. Possible effects of being born relatively large on subsequent fecundity and fertility warrant further investigation

Examining adults' participant roles in cyberbullying

Adults’ participant roles in cyberbullying remain unclear. Two hundred and sixty-four (163 female and 87 male) 18- to 74-year-olds from 31 countries completed measures to assess their experiences of, and engagement in, 5 cyberbullying types for up to 9 media. Cluster analysis identified two distinct groups: rarely victim and bully (85%) and frequently victim and occasional bully. Sex and age predicted group membership: Females and older participants were more likely to belong to the rarely victim and bully group, whereas males and younger participants were more likely to belong to the frequently victim and occasional bully group. The findings have implications for anti-cyberbullying interventions and how behaviors are interpreted online

Room temperature, continuous-wave coupled-cavity InAsP/InP photonic crystal laser with enhanced far-field emission directionality

We demonstrate room temperature, continuous-wave lasing with enhanced far field emission directionality in coupled-cavity photonic crystal lasers, made with InAsP/InP quantum well material. These surface-emitting lasers can have a very low effective threshold power of 14.6 µW, with a linewidth of 60 pm, and 40% of the surface emitted power concentrated within a small divergence angle of ±30°

Coping with school-based peer-victimisation: the role of peers

The focus of the thesis was to investigate the concurrent and longitudinal effects of friendship for coping with school-based peer-victimisation in late childhood. This addressed a gap in the literature pertaining to the role of friendship in children's endorsement of coping behaviour and the buffering effect of friendship on the experience of school loneliness following reports of expected maladaptive coping behaviour. Specifically, the thesis addressed two research questions: (1) What is the role of friendship for coping with school-based peer-victimisation? and (2) Does friendship buffer against the negative effects of maladaptive peer-victimisation coping? These research questions were addressed via a three-wave longitudinal study that examined the concurrent (Chapter 6) and longitudinal (Chapter 7) relationships between peer-victimisation, friendship (quantity and quality), expected peer-victimisation coping behaviour (internalising, retaliation, avoidance, peer support, adult support, and problem solving) and school loneliness (as an indicator of psychosocial adjustment). Longitudinal social network models (Chapter 8) were also applied to examine the co-evolution between friendship and children's expected peer-victimisation coping behaviour. The sample used throughout the thesis was drawn from a population of primary school children aged between 9 to 11 years old (England Year 5 and Year 6). A total of 529 children were invited to take part in the study from across eight schools, this resulted in a final sample of 443 children (55.7% female) at Time 1, 334 children (55.5% female) at Time 2, and 354 children (57.9% female) at Time 3. Findings from across the thesis indicate that children's friendship experiences are concurrently and longitudinally related to expected peer-victimisation coping behaviour. However, these relationships were dependent upon the type of friendship experience (quantity and quality) and the type of expected coping behaviour. Furthermore, negative friendship experiences (conflict within friendships and low levels of reciprocated friendships) were found to exacerbate the negative effects of expected maladaptive (internalising) coping. This was associated with increased feelings of school loneliness in children and continued experiences of verbal peer-victimisation. Through longitudinal and network data, the empirical research presented in this thesis highlights the important contribution of friends and peers for peer-victimisation coping (or expected coping) in children

Room temperature, continuous-wave coupled-cavity InAsP/InP photonic crystal laser with enhanced far-field emission directionality

We demonstrate room temperature, continuous-wave lasing with enhanced far field emission directionality in coupled-cavity photonic crystal lasers, made with InAsP/InP quantum well material. These surface-emitting lasers can have a very low effective threshold power of 14.6 μW, with a linewidth of 60 pm, and 40 of the surface emitted power concentrated within a small divergence angle of ±30°. © 2011 American Institute of Physics.The authors would like to acknowledge support from the Defense Advanced Research Projects Agency under the Nanoscale Architecture for Coherent Hyperoptical Sources programme under Grant No. #W911NF-07-1-0277 and from the National Science Foundation through NSF CIAN ERC under Grant No. #EEC-0812072. J. G. would like to acknowledge support from NSF Research Experience for Teachers (RET) program through NSF CIAN ERC. P. A. P. would like to acknowledge financial support from Spanish MICINN and CAM through grants NANINPHO-QD (TEC2008- 06756-C03-01/03), CAM2010 Q&C Light (S2009ESP-1503) and Consolider-Ingenio 2010 QOIT (CSD2006-0019).Peer Reviewe