Optimal orthogonal block designs for four-mixture components in two blocks based on F-squares for Becker's models and K-model

Orthogonal block designs in mixture experiments have been extensively studied by various authors. Aggarwal et al. [M.L. Aggarwal, P. Singh, V. Sarin, and B. Husain, Mixture designs in orthogonal blocks using F-squares, METRON – Int. J. Statist. LXVII(2) (2009), pp. 105–128] considered the case of components assuming the same volume fractions and obtained mixture designs in orthogonal blocks using F-squares. In this paper, we have used the class of designs presented by Aggarwal et al. and have obtained D-, A- and E-optimal orthogonal block designs for four components in two blocks for Becker's mixture models and K-model, respectively. Orthogonality conditions for the considered models are also given.     

Allometry and photosynthetic capacity of poplar (Populus deltoides) along a metal contamination gradient in an urban brownfield

The value of urban green space has become an increasingly controversial issue. In particular, development of novel vegetative assemblages on vacant lands may have many formerly unrecognized benefits. However, questions remain regarding the functional impairment of these assemblages due to degraded soils. We investigated the effects of elevated concentrations of soil metals on allometry and photosynthetic capacity of naturally colonized poplars (Populus deltoides Michx.) growing at Liberty State Park, New Jersey. We found that allometries of harvested trees did not differ significantly between the low metal load (LML) and high metal load (HML) sites suggesting that metal contamination did not negatively affect carbon allocation patterns of the target species. Likewise, photosynthetic parameters did not differ significantly between the LML and HML sites, suggesting that soil metal contamination did not negatively affect photosynthetic capacity. However, trees from the LML site were significantly younger for a given size than trees from the HML site. Trees from the medium metal load site (MML) differed significantly in allometry and photosynthetic parameters from the other two sites suggesting other edaphic and ecological factors are a stronger driver for carbon allocation patterns and photosynthetic capacity in these trees. Taken together, this research suggests that sapling establishment and growth may be impaired by heavy metals and that trees in HML sites may incur more maintenance costs than trees in LML sites. However, given enough time, poplars can provide considerable rehabilitation of urban brownfields, particularly those that exhibit soil metal contamination.     

American families: policy issues

"Increases in the number of children living in single-parent (usually female-headed) households and in the proportion of mothers who work outside their homes have raised concern in the United States about the effects of these trends on the well-being of children and the possible need for policy intervention. This paper discusses the arguments for and against policies that affect families. We review a number of such policies and what research suggests about their likely effects. The policies discussed...include those concerning child support, welfare, income taxes, child and dependent care, family leave, family planning, programs to improve parenting skills and family function, and economic growth."     

Childhood sexual abuse patterns, psychosocial correlates, and treatment outcomes among adults in drug abuse treatment

This study reports on the effects of having a history of childhood sexual abuse (CSA) on treatment outcomes among substance abusing men and women (N = 2,434) in a national, multisite study of drug treatment outcomes. A history of CSA was reported by 27.2% of the women and 9.2% of the men. Controlling for gender, compared to patients without CSA, patients reporting CSA were younger at entry into the current drug treatment, were more likely to be White, were more likely to have a comorbid mental disorder, be alcohol or cocaine dependent, had higher levels of criminal activities, had a higher level of problem recognition, and had a more negative peer influence. Controlling for these correlates, a history of abuse was related to a lower likelihood of posttreatment abstinence.     

Prenatal Maternal Anxiety and Depression Predict Negative Behavioral Reactivity in Infancy

The effects of maternal antenatal and postnatal anxiety and depression on infant negative behavioral reactivity were examined in a sample of 22 mother‐infant pairs. Maternal anxiety and depression were assessed by standardized measures during the third trimester of pregnancy and postpartum. Infant negative behavioral responses to novelty were assessed using a previously validated measure at 4 months of age. Maternal anxiety and depression during the prenatal, but not the postnatal period, were related to infant negative behavioral reactivity to novelty. These data illustrate that prenatal maternal psychological state can exert persisting influences on human infant behavior.     

Orthogonally blocked mixture component–amount designs via projections of F-squares

Orthogonal block designs for Scheffé’s quadratic model have been considered previously by Draper et al. (1993), John (1984), Lewis et al. (1994) and Prescott, Draper, Dean, and Lewis (1993). Prescott and Draper (2004) obtained mixture component–amount designs via projections of standard mixture designs, viz., the simplex-lattice, the simplex-centroid and the orthogonally blocked mixture designs based on latin squares. Aggarwal, Singh, Sarin, and Husain (2009) considered the case of components assuming equal volume fractions and obtained mixture designs in orthogonal blocks using F-squares. In this paper, we construct orthogonal blocks of two and three mixture component–amount blends by projecting the class of four component mixture designs presented by Aggarwal et al. (2009).     

Qualitative Study on the Impact of Child Sexual Abuse: Perspectives of Children,Caregivers, and Professionals in Indian Context

ABSTRACT

With an alarming increase in reported cases of Child Sexual Abuse (CSA) in India, the present study was conceived in an attempt to unearth the impact of CSA from the perspective of children, their caregivers, and the professionals dealing with them using qualitative research methodology. The secondary objective of the study was to discuss the clinical implications of the obtained findings for conducting culturally sensitive psychological assessment and intervention for CSA in India. Thus, in-depth interviews with 11 children and 7 Focused Group Discussions (FGDs) with 21 caregivers and 27 professionals were conducted. A total of 59 sample participants were recruited, and a thematic analysis was done. Six broad themes were identified from 223 generated codes-impact on behavioral, emotional, cognitive functioning and academics, psychopathology, biological, and social functioning. Four essential recommendations were concluded from the study, i.e., multidimensional impact assessment as a mandatory clinical practice, developing and utilizing culturally sensitive assessment & intervention protocols, incorporation of family-focused approach and multidisciplinary treatment team approach to ensure the holistic well-being of each chilsd in India.     

Neoliberal disorientations: changing landscapes of disability and governance in India

This article delves into questions of neoliberal disorientations experienced by disabled people in the context of a participatory development self-help group project from the World Bank in south India. I explore ways in which neoliberal development regimes produce exclusionary forms of inclusion by producing subjects who are ‘able-disabled’. I ethnographically examine ‘who gets counted’ and ‘what gets counted’ within the neoliberal governance framework, and what remains outside. Deconstructing participatory development approaches from a critical disability perspective, the article sheds light on processes of inclusion through exclusion in the neoliberal framework of governance. It highlights what is at stake for disability futures in the context of austerity in the Global South.     

Cartographies of disease: Maps,mapping, and medicine

Although sociologists regard charisma as a social construct, few studies look at the explicit interactions that create and maintain this type of authority. This article examines one specific, but ubiquitous social interaction between leader and follower – the charismatic touch. The charismatic touch is a semi-formal interaction in which leader and followers exchange mutual recognition through verbal, visual and physical touch. Through touching each other this way, charisma becomes palpable, the bond with followers enlivened and the authority of the leader reconstituted. By analysing photographs from a visual ethnographic study of Diamond Mountain, a Western convert Buddhist community, and images of political leaders culled from mass media, one can observe a dynamic of intimacy and distance in maintaining and performing charisma. As data, visual representations of the charismatic touch capture evidence of its micro-interactional nature and offer a new approach to the field of charisma in the digital age.     

Decision knowledge sharing: flexible supply chains in KM context

Supply chain excellence has a real impact on business strategy. Building supply chains as flexible systems represents one of the most exciting opportunities to create value and one of the most challenging tasks for the policy makers. It requires integrated decision making amongst autonomous chain partners with effective decision knowledge sharing between them. The key to success lies in knowing which decision has more impact on the overall performance and this can be achieved by appropriate knowledge sharing. In this context, knowledge management (KM) can be used as an effective approach to achieve knowledge sharing and decision synchronisation in supply chains. Flexible supply chains (FSC_s) are more complex and involve multiple autonomous players with varying technical cultures (affects knowledge mindsets), managerial background (affects decision knowledge) and supply chain management (SCM) exposures (affects knowledge sharing attitudes). Thus there is a need to develop demo models that can encourage chain managers towards collaborative knowledge sharing in the supply chains. This paper presents the application of one such model based on decision knowledge sharing (DKS) for improved supply chain management. A simulation model of a flexible supply chain based on DKS framework is developed for demo purposes. The key results are highlighted along with industry implications. The cost based performance of DKS at different levels of flexibility is studied. Thus a careful analysis of the chain with a focus on collaborative decisions is useful to ensure success. This paper addresses this interesting and challenging domain.