Stability Dust-Ion-Acoustic Wave in Dusty Plasmas With Stream -Influence of Charge Fluctuation of Dust Grains

There is a quickly increasing wealth of experimental data on so-called dusty plasmas i. e. ionized gases or usual plasmas that contain micron sized charged particles. Interest in these structures is driven both by their importance in many astrophysical as well as commercial situations. Among them are linear and nonlinear wave phenomena. We consider the influence of dust charge fluctuations on stability of the ion-acoustic waves when the stream of particles is present. It is assumed that all grains of dust have equal masses but charges are not constant in time-they may fluctuate in time. The dust charges are not really independent of the variations of the plasma potentials. All modes will influence the charging mechanism, and feedback will lead to several new interesting and unexpected phenomena. The charging of the grains depends on local plasma characteristics. If the waves disturb these characteristic, then charging of the grains is affected and the grain charge is modified, with a resulting feedback on the wave mode. In case considering here, when temperature of electrons is much greater then the temperature of the ions and temperature of electrons is not great enough for further ionization of the ions, we show that stability of the acoustic wave depends only one phenomenological coefficient.Comment: 4 pages,Plasma 2005,Opole-Turawa, Poland, 6-9 september 200

Charge Fluctuation of Dust Grain and Its Impact on Dusty-Acoustic Wave Damping

We consider the influence of dust charge fluctuations on damping of the dust-ion-acoustic waves. It is assumed that all grains have equal masses but charges are not constant in time - they may fluctuate in time. The dust charges are not really independent of the variations in the plasma potentials. All modes will influence the charging mechanism, and feedback will lead to several new interesting and unexpected phenomena. The charging of the grains depends on local plasma characteristics. If the waves disturb these characteristic, then charging of the grains is affected and the grain charge is modified, with a resulting feedback on the wave mode. In the case considered here, when the temperature of electrons is much greater than the temperature of the ions and the temperature of electrons is not great enough for further ionization of the ions, we show that attenuation of the acoustic wave depends only on one phenomenological coefficientComment: 4 pages, 4th International Conference on the Physics of Dusty Plasmas, Orleans-Franc

Exploring the perspectives of practitioners on the needs and experiences of young refugees settling in regional Australia

Across the world large numbers of people are displaced every year and seek asylum in other countries. For example, in 2010 ‘…there were an estimated 43.7 million forcibly displaced people worldwide, including 15.4 million refugees, 837 500 asylum seekers and 27.5 million internally displaced persons’ (Phillips, 2011, p. 1). This number is increasing with the United Nations High Commission for Refugees stating that there are currently over 52 million refugees and displaced people worldwide (UNCHR, 2016). The number of refugees settled in Australia is comparatively small–in the five-year period, 2011-2015, 70,721 humanitarian refugees were settled in Australia (Department of Social Services, 2017c). This paper focuses on the findings of a qualitative exploratory study examining the perceptions of professionals working with young refugees resettled in Townsville, a regional city in northern Australia with a population of just under 200,000. Themes presented include emotional well-being, adapting to a new environment, schooling experience, and living in poorer areas

Management styles of Polish managers

Management style is distinctive and relatively stable behaviour of the manager affecting the employees of the subordinate group. Management style involves personal interactions as well as in a large extent a manager spontaneous reaction in a direct contact with the subordinates. The theoretical part of this work has aimed at presenting problems of management styles and discussed the factors influencing the choice of management style. Furthermore, it provides the leader with the selected concepts and management styles. Particular attention was paid to the Blake Mounton Managerial Grid and W.J. Redline Concepts. The research part presents of the author’s own research and the results obtained by graduates preparing their works under the direction of the author, which are based on the Blake Mounton Managerial Grid. The surveys were conducted among managers of All types of companies (small, medium, large) and different types of public institutions (Police, City Council, Fire Station). These results were contrasted with the results of the management styles presented in the works of other Polish authors. The analysis of the own results and other writers indicates that the most identified style is democratic style. While the studies of other authors show the frequent use of this style but also pay attention to using participation and firefighter management styles.peer-reviewe

Five years after Carmody: practitioners' views of changes, challenges and research in child protection

Child protection work is a complex and difficult area of practice, one that is closely scrutinised and criticised, and impacts on the lives of many children. In Australia, child protection systems are overloaded and increasing numbers of children and families receive child protection interventions each year. This study explored the views of North Queensland practitioners who work in the child protection field, examining changes and challenges in this field of practice, and their suggestions for the future research that is needed in child protection. The study took place five years after the 2013 Queensland Carmody inquiry into child protection intervention, which recommended sweeping changes to the child protection system. Twenty-two practitioners participated in this study. Respondents reported an increase in the complexity of cases, a gap in legislation change/practice frameworks and practice, and the application of trauma-informed practice. They highlighted the intersection of child protection, domestic violence and family law and observed that women and children continue to be exposed to violence because of Family Law Court orders. Respondents identified a number of areas where research is needed

Getting to know the context: the complexities of providing off-site supervision in social work practice learning

Field education is central to social work education, facilitating the development of practice skills, professional identity and a professional practice framework. External supervision in social work field education is becoming more prevalent due to economic, social and political changes at a global level and is likely to continue to be a feature of field education. This article provides findings from current Australian qualitative research exploring 'social work student placements with external supervision', focusing on the experiences and views of external field educators. It explores the research findings in light of international social work education research, particularly with reference to experiences and contexts in England, UK. A range of themes emerge from this study, including a focus on supervision, relationships, roles, placement preparation and assessment. Findings suggest that knowledge and understanding of the placement context is a dominant consideration in social workers' reflections on their experience of providing external supervision to social work students. External supervisors apply a range of strategies to build the understanding of the context of the students' experience and the nature of host agency policies, practices and culture. This can lead to an active engagement of students in their learning, but has implications for resourcing