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61.
Upper bounds axe derived for the efficiency factor of a class of resolvable incomplete block designs known as latinized designs. These designs are particularly useful in glasshouse and field trials, and can be readily extended to two-dimensional blocking structures. Existing bounds for resolvable designs axe also reviewed and a comparison is made between the third moment bounds discussed by Jarrett (1989) and the second moment bounds of Tjur (1990). 相似文献
62.
J. S. Evans L. R. Rhomberg P. L. Williams A. M. Wilson & S. J. S. Baird 《Risk analysis》2001,21(4):697-718
Ethylene oxide is a gas produced in large quantities in the United States that is used primarily as a chemical intermediate in the production of ethylene glycol, propylene glycol, non-ionic surfactants, ethanolamines, glycol ethers, and other chemicals. It has been well established that ethylene oxide can induce cancer, genetic, reproductive and developmental, and acute health effects in animals. The U.S. Environmental Protection Agency is currently developing both a cancer potency factor and a reference concentration (RfC) for ethylene oxide. This study used the rich database on the reproductive and developmental effects of ethylene oxide to develop a probabilistic characterization of possible regulatory thresholds for ethylene oxide. This analysis was based on the standard regulatory approach for noncancer risk assessment, but involved several innovative elements, such as: (1) the use of advanced statistical methods to account for correlations in developmental outcomes among littermates and allow for simultaneous control of covariates (such as litter size); (2) the application of a probabilistic approach for characterizing the uncertainty in extrapolating the animal results to humans; and (3) the use of a quantitative approach to account for the variation in heterogeneity among the human population. This article presents several classes of results, including: (1) probabilistic characterizations of ED10s for two quantal reproductive outcomes-resorption and fetal death, (2) probabilistic characterizations of one developmental outcome-the dose expected to yield a 5% reduction in fetal (or pup) weight, (3) estimates of the RfCs that would result from using these values in the standard regulatory approach for noncancer risk assessment, and (4) a probabilistic characterization of the level of ethylene oxide exposure that would be expected to yield a 1/1,000 increase in the risk of reproductive or developmental outcomes in exposed human populations. 相似文献
63.
64.
Trish Williams Jennifer Connolly Robert Cribbie 《Journal of research on adolescence》2008,18(1):145-172
The objectives of this research were to explore patterns of heterosexual activity in early adolescence and to examine the differential pathways to light and heavy heterosexuality. We utilized the National Longitudinal Survey of Canadian Children and Youth (NLSCY) in which heterosexual behaviors, as well as puberty, parenting processes, peer self‐concept, and problem behaviors were examined. The heterosexual activities of the majority of 12‐ and 13‐year‐old adolescents were largely confined to light activities of hugging, holding hands, and kissing. Heavy activities such as petting and sexual intercourse were reported less often. Using predictor variables from Cycle 1 of the NLSCY when participants were 10‐ and 11‐year‐olds, SEM analyses indicated that puberty and higher peer self‐concept shared significant direct pathways to both light and heavy heterosexuality. Heavy sexual activity, however, was uniquely associated with the risk factors of adolescent problem behaviors. Positive and hostile parenting styles were indirectly associated with light sexual activity through peer self‐concept. Positive and hostile parenting styles were also indirectly associated with heavy sexual activity through both peer‐oriented self‐concept and problem behaviors. Results support differential patterns and predictors of light and heavy sexuality in early adolescence. 相似文献
65.
J. Patrick Williams 《Sociology Compass》2007,1(2):572-593
The study of youth subcultures has rich histories in the USA and UK, yet has remained a marginal subfield within cultural sociology. In this article, I begin by reviewing the significance of the Chicago school, strain theory, Birmingham school and post-subcultural studies traditions of youth-cultural and youth-subcultural research. I then conceive of a series of significant analytic concepts that over time have proven themselves to be core components of youth-subcultural studies. These analytic concepts include subcultural style, resistance, subcultural space and media, societal reaction, and identity and authenticity. In each analytic section, I explore major conceptual frames and discuss significant empirical research, on youth subcultures including punk goth, straightedge, riot grrrl skateboarding, rave and club cultures, among others. 相似文献
66.
Abstract This study examines parents' decisions about educating some or all of their children beyond primary school in rural Thailand. Their strategies often involve choices between sons and daughters and between older versus younger children. We find that the more children there are in a family, the lower the proportion who are sent to secondary school. Parents send more sons than daughters and more youngest than eldest children. The decision is sometimes associated with a specific “investment” strategy, but it may also reflect parents' ability to afford to send children beyond primary school. Important economic factors include children's perceived earning potentials, anticipated opportunity costs, and parents' poverty status. However, the issues of access to schools and the safety of children, particularly girls, are also critically important. These concerns are often weighed as heavily, or more heavily, than economic considerations. 相似文献
67.
This paper addresses crisis communication shortcomings of oil companies working in the Nigerian delta region. The anticipatory model of crisis communication is blended with the public relations relational perspective to demonstrate how oil companies have responded to crises in the delta region in a manner contrary to what would be consistent with these perspectives. The result has been persistent turmoil in the region and significant distrust of the organizations. 相似文献
68.
Golnar A. Simpson Jay C. Williams Anne Brantley Segall 《Clinical Social Work Journal》2007,35(1):3-14
In response to a growing diversity of opinion regarding educational models and essential content in clinical social work education,
this paper offers a perspective concerning graduate clinical curricula. Part I, the foundational piece of the paper, discusses
the definition of clinical social work, social work’s core orientation and values, and influential contextual issues. The
interrelated core orientations guiding knowledge and skill development are identified as the person-in-situation perspective and the concept of relationship. Based on this foundation, Part II identifies elements of a contemporary biopsychosocial knowledge base and essential clinical
skills. This paper is intended to stimulate dialogue about a topic of importance to the profession and the clients it serves. 相似文献
69.
SenGupta (1987) proposed a locally most powerful test which is globally (one sided) unbiased, and an estimator of p, the equicorrelation coefficient of a standard symmetric multivariate normal (SSMN) distribution. Here we use the idea in Williams (1984) to illustrate the construction and use of ancillary statistics to make inference about p. The test and confidence intervals based on this construction are conditionally optimal. 相似文献
70.
Sandra Kensbock Janis Bailey Gayle Jennings Anoop Patiar 《Gender, Work and Organization》2015,22(1):36-50
Given the gendered power relations and the isolated nature of women hotel room attendants' working environments, guest‐initiated sexual harassment experienced by room attendants is a significant, under‐investigated problem. This study of women attendants' experiences of sexual harassment was conducted in 5‐star hotels located on the Gold Coast — a notable tourism destination — of Queensland, Australia. Adopting a socialist–feminist critical theory epistemological perspective, the study used a qualitative constructivist grounded theory methodology. The research reveals the pervasiveness of sexual harassment experienced by women hotel room attendants. In particular, this study illuminates the varied forms, meanings and consequences of sexual harassment in a particular organizational context. In focusing on the interacting effects of the gendered nature of the hotel workplace and the hotel workplace culture, the near‐complete ‘normalization’ of sexual harassment within the hotels is revealed. This outcome is a source of considerable concern, with implications for the industry, for employment relations institutions and for public policy. 相似文献