Existence and Uniqueness of Q-Processes with a Given Finite μ-Invariant Measure

Let Q be a stable and conservative Q‐matrix over a countable state space S consisting of an irreducible class C and a single absorbing state 0 that is accessible from C. Suppose that Q admits a finite μ‐subinvariant measure m on C. We derive necessary and sufficient conditions for there to exist a Q‐process for which m is μ‐invariant on C, as well as a necessary condition for the uniqueness of such a process.     

Postmodern synergistic knowledge creation: extending the boundaries of disability studies

The tensions between the competing discourses of the medical and the social models of disability have traditionally provided a platform for discussion and research in the fields of disability studies and special needs education. Over the last 30 years a wealth of literature has consolidated the debate and produced particular knowledge of impairment and disability. In this paper we argue that by privileging notions of ‘deficit’ within these medical or social model perspectives the richness of the lived experience of people with impairments is denied. The individual becomes lost within a framework of medical symptoms or social inequalities. This paper considers alternative approaches which reveal a fuller picture of the lives of people with impairments. The authors conducted two separate empirical studies, one employing a Deleuzo‐Guattarian perspective, the other a Bourdieusian perspective. In this paper we illustrate how these theories of practice can reveal situated understandings of the individual with impairments and his/her daily life. By embracing new understandings and different theoretical perspectives we show how new knowledge can emerge to illuminate the fluid and ever‐changing notions of ‘disability’, ‘inclusion’ and ‘exclusion’, which form elements of the individual lived experience of the research participants.     

Fitting and comparing seed germination models with a focus on the inverse normal distribution

This paper reviews current methods for fitting a range of models to censored seed germination data and recommends adoption of a probability‐based model for the time to germination. It shows that, provided the probability of a seed eventually germinating is not on the boundary, maximum likelihood estimates, their standard errors and the resultant deviances are identical whether only those seeds which have germinated are used or all seeds (including seeds ungerminated at the end of the experiment). The paper recommends analysis of deviance when exploring whether replicate data are consistent with a hypothesis that the underlying distributions are identical, and when assessing whether data from different treatments have underlying distributions with common parameters. The inverse normal distribution, otherwise known as the inverse Gaussian distribution, is discussed, as a natural distribution for the time to germination (including a parameter to measure the lag time to germination). The paper explores some of the properties of this distribution, evaluates the standard errors of the maximum likelihood estimates of the parameters and suggests an accurate approximation to the cumulative distribution function and the median time to germination. Additional material is on the web, at http://www.agric.usyd.edu.au/staff/oneill/ .     

Outcasts…Outliers…Oppressed: Civic Advocates in U.S. History Worth Investigating

As de Tocqueville recognized, the U.S. democratic system relies on the advocacy of civic-minded individuals. Although U.S. history is replete with persons using different means to advance one or more democratic principles, VanSledright and Hess argued that secondary history education reinforces a persistent national narrative, one characterized by progress toward achieving national goals, an emphasis on ethnic success stories and avoidance of ethnic struggles and conflicts, and a quest for freedom. Such an approach results in a celebratory story of success, rarely one of struggle or failure. This approach silences those seemingly on the fringes of democratic society, denying students access to a richer, more nuanced narrative and to diverse ways to become civically engaged. To address this situation, we suggest first enabling students to contemplate what influences how individuals become civically engaged, next to apply their thinking to contemporary public policy matters, and finally to compare their decisions to those of historical figures, such as Bayard Rustin, often overlooked in the national narrative.     

The Epistemic Integrity of NASA Practices in the Space Shuttle Program

This article presents an account of epistemic integrity and uses it to demonstrate that the epistemic integrity of different kinds of practices in NASA's Space Shuttle Program was limited. We focus on the following kinds of practices: (1) research by working engineers, (2) review by middle-level managers, and (3) communication with the public. We argue that the epistemic integrity of these practices was undermined by production pressure at NASA, i.e., the pressure to launch an unreasonable amount of flights per year. Finally, our findings are used to develop some potential strategies to protect epistemic integrity in aerospace science.     

The wisdom of family therapists

This qualitative research study explored the ways in which family therapists (MSWs) perceive the family treatment process. A purposive sample of eight practicing clinical social workers were selected for face to face interviews which explored the workers' perceptions of the family treatment process. Findings revealed that although certain consistent themes appear to exist among family therapists, family therapy practice may well be much more idiosyncratic than commonly believed.     

Investigating the impact of Hurricane Maria on an ongoing birth cohort in Puerto Rico

Population and Environment - Prior to Hurricane Maria, Puerto Rico already had 200+ hazardous waste sites, significant contamination of water resources, and among the highest rates of preterm birth...