Analysis of work hardening and recrystallization during the hot working of steel using a statistically based internal variable model

A mathematical model has been developed which describes the hot deformation and recrystallization behavior of austenite using a single internal variable: dislocation density. The dislocation density is incorporated into equations describing the rate of recovery and recrystallization. In each case no distinction is made between static and dynamic events, and the model is able to simulate multideformation processes. The model is statistically based and tracks individual populations of the dislocation density during the work-hardening and softening phases. After tuning using available data the model gave an accurate prediction of the stress–strain behavior and the static recrystallization kinetics for C–Mn steels. The model correctly predicted the sensitivity of the post deformation recrystallization behavior to process variables such as strain, strain rate and temperature, even though data for this were not explicitly incorporated in the tuning data set. In particular, the post dynamic recrystallization (generally termed metadynamic recrystallization) was shown to be largely independent of strain and temperature, but a strong function of strain rate, as observed in published experimental work.

Three-dimensional Finite Element modelling of laser shock peening process

Laser shock peening (LSP) is an innovative surface treatment technique for metal alloys, with the great improvement of their fatigue, corrosion and wear resistance performance. Finite element method has been widely applied to simulate the LSP to provide the theoretically predictive assessment and optimally parametric design. In the current work, 3-D numerical modelling approaches, combining the explicit dynamic analysis, static equilibrium analysis algorithms and different plasticity models for the high strain rate exceeding 106s-1, are further developed. To verify the proposed methods, 3-D static and dynamic FEA of AA7075-T7351 rods subject to two-sided laser shock peening are performed using the FEA package–ABAQUS. The dynamic and residual stress fields, shock wave propagation and surface deformation of the treated metal from different material modelling approaches have a good agreement.

Not just for romance: applications of speed dating in social work education

In this article we address how a contemporary adaptation of the 'speed dating' model was used for educational purposes with two cohorts of social work students. We outline the dimensions of 'speed dating' as a contemporary social phenomenon, then address how this model relates specifically to groupwork process, and can be used to facilitate social work student learning. The curriculum for two classroom group activities using the 'speed dating' model are outlined, the first to develop university level study skills, the second for debriefing field placement learning experiences. Finally we examine why the 'speed dating' metaphor was successful in provoking a playful yet constructively creative space for students to engage in groupwork process.

Discussing sex at work can be a costly business: Translating the science, language and law behind M v A & U (2007) QADT 8...

On 16 March 2007, in the matter of M v A & U [2007] QADT 8, the Anti-Discrimination Tribunal of Queensland found that a complaint of discrimination in the supply of goods and services had been made out by the complainant on two grounds: her female sex and lawful sexual activity. The decision would have been quite unremarkable except that ‘M’, as the complainant was known for the purposes of the hearing, is a woman of difference, one who had unusually arrived at her legal female state by completing the sex reassignment process now more commonly described as ‘sex affirmation’.

This article seeks to elaborate on the language and law of transsexualism used by the Tribunal. Its aim is to enhance practitioners’ understanding of the legal and social issues peculiar to those who affirm a sex opposite that first assigned to them so that those practitioners may better interpret the law to their clients. As the instant decision shows, the failure by an employer to take reasonable steps to avoid infringing the Anti-Discrimination Act 1991 (Qld), either on its own part or by the actions of its employees, can prove a costly business indeed.

The author offers a brief synopsis of the current medical viewpoint regarding transsexualism and reviews recent Australian legal developments in the jurisprudence. She reminds practitioners that the Anti-Discrimination Act 1991 (Qld) has since been further strengthened by the inclusion of ‘gender identity’ as a protected attribute, and concludes by proposing the existence of a heightened duty on the part of practitioners to ensure business clients are aware of the full extent of their legal obligations to not discriminate against employees or clients.

Returning to work: exploring the experiences of women with acute coronary syndromes

Aims: The aim of this study was to explore the transition experiences of Australian women in resuming paid employment after an acute coronary syndrome (ACS) event. Background: Until recently cardiovascular research has focused predominantly on men but this is changing and research exploring women’s experiences of ACS has increased. Despite knowing that many women do not resume paid employment following an ACS event, little is known about the experience of those women who do, even though it is understood that returning to the previous level of employment after an ACS event is a positive outcome. Design: An exploratory qualitative approach underpinned by naturalistic inquiry was undertaken. Methods: A purposive sample of seven women who had experienced their first ACS event 12 months ago was selected. Each woman was interviewed using a semi–structured format and their interviews were transcribed verbatim. Thematic analysis of the transcript set and conceptual mapping were employed to formulate key themes. Findings: All women (mean age 52.6 years) resumed paid employment at various stages during their recovery, but reported similar transition processes. Three key themes representing this process were identified: primary motivation; influence through guidance and support; and resuming paid employment. Conclusions: Study findings revealed that these women required substantial support from family, friends and employers, with ongoing guidance from health professionals to return to paid work. The time frames for their return varied and some modified their roles within the workforce to enable them to return to paid work. However, formal cardiac rehabilitation did not appear to have a significant impact on these participants' decisions to return to work. They felt that more information about this decision may have been helpful if given at the time of cardiac rehabilitation.

Beyond the power of one : redesigning the work of school principals

There is mounting international research evidence that the work of school principals is increasingly difficult, time consuming and more unattractive to prospective applicants. We suggest that the solution to this situation lies in redesigning the work that principals do. Using the New London Group’s (1996) definition of design as both process and product and as a hybrid of existing resources, we offer five cases of redesign: distributed pedagogical leadership, co-principalship, shared principalship, multi-campus principalship, and community-based principalship. We argue that these examples show that redesigns that focus on the school, rather than on the work of the principal, have more far-reaching effects, but are also much more vulnerable to context. We propose three emerging principles for redesign viz. developing a strong warrant for redesign, attending to infrastructure and building organic relations between school and community.

Aluminium powder forging process using a rotating platen

A torsional upset forging process is analysed on the basis of plasticity theory for powder metal forging. Torsional upset forging is a process to be performed by rotating a lower die with a punch travelling along the longitudinal direction of a work-piece. In this study, an upper bound analysis considering bulging effect, finite element method simulation (DEFORM3D), and experimental research have been performed for the process. A simple kinematically admissible velocity field for a three dimensional deformation is presented for the torsional upset forging of a cylindrical billet. Distributions of stress, strain, and forging load in the process have been obtained, and compared with those in conventional upset forging. In the process, an increase in a friction factor and rotation speed results in a decrease in magnitude of upset force, dead metal zone, and non-homogeneous deformation. This process can reduce forming load, which leads to improvement of die life, and also reduce bulging effect. In addition, the initial sintered-structure and density distribution is improved by the process and surface defect due to high deformation is decreased.

Mothers and sons : using memory-work to explore the subjectivities and practices of profeminist men

In this chapter I will outline the application of memory-work to understanding the subjectivities and practices of profeminist men. Profeminism for men involves a sense of responsibility to our own and other men's sexism, and a commitment to work with women to end men's violence (Douglas, 1993). It acknowledges that men benefit from the oppression of women, drawing men's attention to the privileges we receive as men and the harmful effects these privileges have on women (Thome-Finch, 1992). The research was undertaken as my PhD thesis and it began with questions that have been a personal challenge in my search· to understand my place as a white, heterosexual man who is committed to a profeminist position 1. What does it mean to be a profeminist man? What is the experience of endeavoring to live out a profeminist commitment? What do these experiences tell us about reforming men's subjectivities and practices towards gender equality? I believe that men's subjectivity is crucial to the maintenance and reproduction of gender domination and hence to its change. The purpose of the research was thus to theorize men's subjectivities and practices to inform a profeminist men's practice and to enact strategies that will, in themselves, promote the process of change. So the research was driven by practical concerns as well as by the imperatives of intellectual inquiry.

Designing, implementing and evaluating a social work practice skills course: a case example

Practice skills, such as communication and interviewing skills, are an integral part of every undergraduate course that aims to provide professional qualification for social workers. While there is substantial literature about the skills required to be a proficient social work practitioner, there is a dearth of literature about how to teach such skills and particularly how students experience such a course. By critically reflecting on the design, implementation and evaluation of a social work practice skills course, this article is offered as a contribution toward filling an identified gap in social work education literature. The course evaluation particularly highlights the importance of face to face interaction between students and teachers to the process of learning.

Ghosts in the machine : student participation and grade attainment in a web-assisted social work course

For many social work educators, the debate about whether social work education should be delivered using online technology has, as a result of institutional imperatives, moved on to how best this can be done. In this article, the process of designing and delivering part of a social work course using asynchronous online discussion is described and reflected upon. Student participation in the online environment is also compared with final course grades and the findings discussed in relation to existing literature. Recommendations for the future delivery of social work courses using online technology emerging from this discussion are offered.

Vietnamese-born health professionals : negotiating work and life in rural Australia

Introduction: Australia is a culturally diverse nation due to migrants from a wide variety of countries creating a multicultural society. The health professions are highly valued by the younger generation of overseas-born migrants who have acculturated into Australian society; many have chosen health care as their profession in Australia. However, most migrants settle in metropolitan areas and young health professionals may find working in rural or remote Australia culturally and professionally highly challenging. The present study of migrant health professionals examined the life experiences and acculturation strategies of Vietnamese-born health professionals working and living in rural Australia. Objectives: The two main study objectives were to: (1) examine aspects of the acculturation of overseas-born and Australian-trained health professionals in the Australian health discourse; and (2) identify key coping strategies used by them when in working in the rural context.

Methods: Six overseas-born, Australian-trained health professionals were invited to participate in this qualitative study using a snowball sampling technique. The participants were all born in Vietnam and had experienced working in rural Australia. They included three medical doctors, a dentist, a physiotherapist and a nurse. The interviews were recorded and four participants also provided additional written responses to some of the open-ended interview questions. The interview data were transcribed and later coded for thematic analysis. Topics and themes that emerged focused on the issues and strategies of acculturation to the rural health context.

Results: The study showed that the acculturation process was affected by the participants’ views about and attitudes towards working in an Australian rural context. The study identified these essential strategies used by the participants in adapting to a new workplace: collaborating, distancing, adjusting, repairing, and accommodating.

Conclusion: The study provides insights into the lives of these health professionals in a rural context, and particularly their experience of cultural shock and the coping strategies they may use. A need is identified for a larger study to inform recruitment and retention of these health professionals to rural Australia, and to assist universities to prepare such students and their clinical supervisors for rural placements.

Integral approach and numerical improvement to calculate the carbon concentration profiles in carburising process

In the present work, the carbon diffusion in steel, where the carbon diffusivity varies with the carbon content, was solved with the integral methods under the third boundary condition. The variation of carbon diffusivity in steel with the carbon content was described with two different functions ie. linear dependence and exponential dependence. The integral approximation for both cases was improved with the numerical computation to more accurately predict the carbon profiles. The integral solution is more accurate than the formulation based on the assumption of a constant diffusivity or those based on the assumption of a constant diffusivity and/or constant carbon content at part surface. It is also more easily used in practice than the numerical method to describe the carburising process and predict the carbon content at steel surface and carbon profiles in treated layer.

Spatial ecology of a root parasite : from pattern to process

Occurrence patterns of parasitic plants are constrained by the distribution of suitable hosts and movement patterns of seed vectors and, accordingly, represent a simplified system to study many aspects of spatial ecology and determinants of distribution. Previous work has focused on the aerially hemiparasitic mistletoes, and it is unclear whether root parasites are affected by similar factors. Here, we evaluate spatial patterns in the root parasitic Santalum lanceolatum in an arid shrubland in north-western New South Wales, central Australia. In this region, the principal host is a long-lived nitrogen fixing shrub Acacia tetragonophylla closely associated with ephemeral creek-lines. The location of 765 individuals of both species was mapped along a 250-m section of creek-line using a total survey station, and occurrence patterns of the root parasite related to host distribution and landscape context. We used Ripley's K-function and the O-ring statistic to determine whether the distribution of S. lanceolatum was random, aggregated or regular; the spatial scales at which these patterns occurred; and to quantify any spatial associations between the parasite and its host, A. tetragonophylla. While acacias were closely associated with the creek-line, S. lanceolatum plants were more tightly clustered, displaying significant clustering at two spatial scales (1.2 m and 8.8 m). We suggest that host quality may act as an important constraint, with only those acacias growing in or near the creek-line being physiologically capable of supporting a parasite to maturity. Insights gained from spatial analysis are used to guide ongoing research in this system, and highlight the utility of the O-ring statistic for understanding patterns of distribution affected by multiple processes operating at critical scales.

Understanding educational process in leadership development

This thesis is a case study of educational process in the leadership development program of the Australian Defence Force Academy. The intention is to determine the relative emphasis in educational process on the conventional command and managerial compliance (Type A) style and the emergent contingent and creative (Type B) style of leadership. The Type A style is theorised as emphasizing hierarchy and control, whereas the emphasis in a Type B style is on adaptive and entrepreneurial behaviour. This study looks at the learning process in a cultural and structural context rather than focus on curriculum and instructional design. Research in this wider context is intended to enable development processes to successfully bridge a gap between theory and practice, implicit in studies that identify theories 'in-operation' as different from the theories 'espoused' (Argyris 1992, Savage 1996). In terms of espoused and in-use theory, the study seeks to produce a valid and reliable result to the question: what is the relative emphasis on the two leadership styles in the operation of the three educational mechanisms of curriculum, pedagogy (teaching practice) and assessment? The quantitative analysis of results (n = 114) draws attention to both leadership styles in terms of two and three-way relationships of style, cadet or work group and service type. The data shows that both Type A and Type B leadership styles are evident in the general conversation of the organisation. This trend is present as espoused theory in the curriculum of the Defence Academy. However, the data also confirm a clear and strong emphasis towards command and managerial compliance as theory-in-use, particularly by cadets. This emphasis is noticeably evident in the teaching and assessment practice of the Defence Academy. Other research outcomes include the observation that: Contextually, while studies show it is difficult to isolate skills from their cultural and biographical context (Watkins, 1991:15), this study suggests that it is equally difficult to isolate skills development from this context. There is a strong task or instrumental link identified by cadet responses in terms of content and development process at the Defence Academy, in contrast to the wider developmental emphasis in general literature and senior officer interviews. There is a lack of awareness of teaching strategies and development activity consistent with espoused Type B leadership theory and curriculum content. This gap is compounded by the use in the Defence Academy of personnel without teaching expertise or suitable developmental experience. The socialisation of cadets into the military workplace is the primary purpose of training. This purpose appears taken for granted by all concerned - staff, cadets and senior officers. Defence Academy development processes appear to be faced with a dilemma. Arguably, training and learning from experience are limited approaches to development. Training, which involves learning by replication, and learning from experience, which is largely imitative, are both of little use when people are faced with novel and ambiguous situations. This study suggests that in order to support the development of capabilities that go beyond training based competence a learning and development approach is needed. This more expansive approach requires educational planners to consider the cultural and social context that can inadvertently promote the status quo in practice over espoused outcomes.

Negotiating curriculum work in ESL

Conducting applied research in workplace settings on and/or with colleagues raises a host of ethical and procedural issues about research. Empiricist, interpretive, and critical approaches all have a place in understanding, describing and changing curriculum perceptions. As one moves from one paradigm to the other the voices of the agents in the curriculum process become increasingly prominent. With reference to some of my own workplace research under the three paradigms mentioned above, I describe ways in which educational research in workplace settings represents curriculum reality and can act as an engine of change.