Spatial prediction of crystalline defects observed in molecular dynamic simulations of plastic damage

Molecular dynamic computer simulation is an essential tool in materials science to study atomic properties of materials in extreme environments and guide development of new materials. We propose a statistical analysis to emulate simulation output with the ultimate goal of efficiently approximating the computationally intensive simulation. We compare several spatial regression approaches including conditional autoregression (CAR), discrete wavelets transform (DWT), and principle components analysis (PCA). The methods are applied to simulation of copper atoms with twin wall and dislocation loop defects, under varying tilt tension angles. We find that CAR and DWT yield accurate results but fail to capture extreme defects, yet PCA better captures defect structure.     

Zora Neale Hurston’s visual and textual portrait of middle passage survivor Oluale Kossola/Cudjo Lewis

This article examines African American folklorist Zora Neale Hurston’s book-length biography and film of the last known Middle Passage survivor, Oluale Kossola/Cudjo Lewis, to explore her cinematic and literary engagement with slavery and to recover Lewis as a co-author of both documents. Hurston’s literary project, ‘Barracoon’, in which she situated herself merely as Kossola’s amanuensis and foregrounded the ‘inexpressible violence’ and ‘horror’ of his experience, represented an unusually frank twentieth-century record of enslavement and post-slavery life. Such work pre-dated and lacked the patronising tone of much of the WPA Slave Narrative Collection (1936–1938), whose investigators were mainly white and whose subjects’ accounts were often reconstructed loosely from field notes. Moreover, Hurston’s footage of Lewis circumvented literary mediation altogether to provide an Atlantic slavery survivor with an unprecedented visual outlet for self-expression.     

Real Gender: Identity,Loss, and the Capacity to Feel Real

This article concerns gender and feeling real. Beginning with Judith Butler’s deconstruction of gender as an ontological category, it argues that the subjective experience of gender as real has been underaccounted for. By reviewing Butler’s work on gender melancholy and then elaborating psychoanalytic theories of identification and reality, this article links feeling real to the dual capacities to both separate from and connect with the object. To illustrate the implications for thinking gender identity and transformation, it concludes with a reading of Miles Walser’s poem about the name discarded in a gender transition.     

Barriers to the implementation of medication-assisted treatment for substance use disorders: the importance of funding policies and medical infrastructure

Despite growing interest in the use of evidence-based treatment practices, adoption of pharmacotherapies for treating substance use disorders (SUDs) remains modest. Using data from telephone interviews with 250 administrators of publicly funded SUD treatment programs, this study estimated a model of adoption of medication assisted treatment (MAT) for SUDs and examined the relative importance of regulatory, cultural, medical resource, patient-level, and funding barriers to MAT implementation. MAT-adopting programs had significantly greater medical resources, as measured by the employment of physicians and nurses, than non-adopting programs. Administrators of non-adopting programs were asked to rate the importance of 18 barriers to MAT implementation. The most strongly endorsed barriers were regulatory prohibitions due to the program's lack of medical staff, funding barriers to implementing MAT, and lack of access to medical personnel with expertise in delivering MAT. Barriers related to insufficient information about MAT and unsupportive staff attitudes were not widely endorsed. These findings suggest that efforts to promote the implementation of MAT that are inattentive to funding barriers and weaknesses in medical infrastructure may achieve sub-optimal results.     

Gambling: The shaping of an opinion

Examining historical and contemporary writings, the authors show that many of the negative arguments about gambling spring from selfish interests in the business and political sectors. The stigma associated with gambling turns out to be a method of preventing competition from gambling, and leads to misguided social policies.The authors are, respectively, associate professor of economics at the Business School of the University of Montreal (HEC), and professor of economics in the department of economics of the University of Montreal. The paper draws on our recently published bookGambling and Speculation (Cambridge University Press, 1990), as well as on events that took place since we finished writing it. We thank Loto-Québec for its financial support.     

Social Desirability Bias in Self-reports of Physical Activity: Is an Exercise Identity the Culprit?

Like that of other normative behaviors, much of the research on physical exercise is based on self-reports that are prone to overreporting. While research has focused on identifying the presence and degree of overreporting, this paper fills an important gap by investigating its causes. The explanation based in impression management will be challenged, using an explanation based in identity theory as an arguably better fitting alternative. Respondents were randomly assigned to one of two conditions: (1) a web instrument using direct survey questions, or (2) a chronological reporting procedure using text messaging. Comparisons to validation data from a reverse record check indicate significantly greater rates of overreporting in the web condition than in the text condition. Results suggest that measurement bias is associated with the importance of the respondents’ exercise identity, prompted by the directness of the conventional survey question. Findings call into question the benefit of self-administration for bias reduction in measurement of normative behaviors.     

What do midwives fear?

BackgroundThere is evidence that a significant number of women are fearful about birth but less is known about the fears of maternity health providers and how their fear may impact on the women they care for.AimThe aim of this study was to determine the top fears midwives in Australia and New Zealand hold when it comes to caring for childbearing women.MethodFrom 2009 to 2011, 17 workshops were held in Australia and New Zealand supporting over 700 midwives develop skills to keep birth normal. During the workshop midwives were asked to write their top fear on a piece of paper and return it to the presenters. Similar concepts were grouped together to form 8 major categories.FindingsIn total 739 fears were reported and these were death of a baby (n = 177), missing something that causes harm (n = 176), obstetric emergencies (n = 114), maternal death (n = 83), being watched (n = 68), being the cause of a negative birth experience (n = 52), dealing with the unknown (n = 36) and losing passion and confidence around normal birth (n = 32). Student midwives were more concerned about knowing what to do, while homebirth midwives were mostly concerned with being blamed if something went wrong.ConclusionThere was consistency between the 17 groups of midwives regarding top fears held. Supporting midwives with workshops such as dealing with grief and loss and managing fear could help reduce their anxiety. Obstetric emergency skills workshops may help midwives feel more confident, especially those dealing with shoulder dystocia and PPH as they were most commonly recorded.