title: Instability of a plane conducting free surface submitted to an alternating magnetic field

authors: Fautrelle, Y.

abstract: This paper considers the stability of a horizontal liquid-metal free surface in the presence of a horizontal alternating magnetic field. A weak formulation is used to derive a generalized Mathieu–Hill equation for the evolution of surface perturbations. Previous studies which rely on time-averaging the electromagnetic force over one field cycle have predicted a generally weak instability, but we find much larger growth rates near the resonances, where the surface wave frequency is an integral multiple of the field frequency. The method can be extended to include viscous and ohmic damping; the former has little effect, while the latter damps all waves except those whose frequency is close to the field frequency. Growth rates can be closely approximated by simple algebraic formulae, as can the critical magnetic field strength for the onset of instability.

text: Instability of a plane conducting free surface submitted to an alternating magnetic field This paper considers the stability of a horizontal liquid-metal free surface in the presence of a horizontal alternating magnetic field. A weak formulation is used to derive a generalized Mathieu–Hill equation for the evolution of surface perturbations. Previous studies which rely on time-averaging the electromagnetic force over one field cycle have predicted a generally weak instability, but we find much larger growth rates near the resonances, where the surface wave frequency is an integral multiple of the field frequency. The method can be extended to include viscous and ohmic damping; the former has little effect, while the latter damps all waves except those whose frequency is close to the field frequency. Growth rates can be closely approximated by simple algebraic formulae, as can the critical magnetic field strength for the onset of instability.

year: 1998

title: Doctoral supervision practice models: Where to from here?

authors: Johnson, E. Marcia

abstract: The aim of this session is to present and discuss a framework for supervisor professional development, including aspects that could contribute to the skills needed in the current supervisory environment. Supervisors face a variety of challenges, and a central issue is how to best prepare and support them. However, an examination of supervisor professional development programmes across the sector indicates unevenness in their depth and breadth. While some universities offer comprehensive supervisor training, others focus on regulatory matters such as completions and progress reports. Of course supervisors must be aware of regulations, but there is also a need for more comprehensive supervisor preparation, particularly in such areas as research writing development. The research underpinning this presentation synthesised a range of literature about the doctoral curriculum, general professional development of higher degree research (HDR) candidates, writing as a mediating tool for academic development, and the consequent implications that all these factors have for supervisor professional development. Five key themes (with accompanying sub-themes) were identified and extended those proposed by Hammond, Ryland, Tennant, and Boud (2010). They include: regulations and compliance issues, developing an understanding of a doctoral epistemology, dealing with problems and issues beyond supervision, specific issues involved in the supervision of international students, and developing cross-disciplinary communities of professional practice. This presentation will describe composite elements of the themes and seek participants’ views on how they could be enhanced and evaluated.

text: Doctoral supervision practice models: Where to from here? The aim of this session is to present and discuss a framework for supervisor professional development, including aspects that could contribute to the skills needed in the current supervisory environment. Supervisors face a variety of challenges, and a central issue is how to best prepare and support them. However, an examination of supervisor professional development programmes across the sector indicates unevenness in their depth and breadth. While some universities offer comprehensive supervisor training, others focus on regulatory matters such as completions and progress reports. Of course supervisors must be aware of regulations, but there is also a need for more comprehensive supervisor preparation, particularly in such areas as research writing development. The research underpinning this presentation synthesised a range of literature about the doctoral curriculum, general professional development of higher degree research (HDR) candidates, writing as a mediating tool for academic development, and the consequent implications that all these factors have for supervisor professional development. Five key themes (with accompanying sub-themes) were identified and extended those proposed by Hammond, Ryland, Tennant, and Boud (2010). They include: regulations and compliance issues, developing an understanding of a doctoral epistemology, dealing with problems and issues beyond supervision, specific issues involved in the supervision of international students, and developing cross-disciplinary communities of professional practice. This presentation will describe composite elements of the themes and seek participants’ views on how they could be enhanced and evaluated.

year: 2016-04-22

title: Countering gentrification in Tāmaki Makarau: Towards a framework for urban environmental justice

authors: Terruhn, Jessica

abstract: This policy brief argues for urban policies that actively aim to end gentrification.

Gentrification is intimately tied to state-led processes of urban renewal. Though historically understood as the displacement of low-income households as an unfortunate byproduct of socioeconomic and demographic neighbourhood change, contemporary gentrification is constituted by profit-driven investment decisions that erase undervalued neighbourhoods and their communities in the name of urban renewal (variously referred to as redevelopment, regeneration, renaissance, or revitalisation).

These processes of gentrification fundamentally contribute to environmental injustice. At the same time as creating ‘zones of abundance’, neighbourhood regeneration projects simultaneously (re-)create ‘zones of neglect and sacrifice’, which are burdened with environmental risks. As low-income and ethnic minority households are more likely to either reside in or to be displaced into these neighbourhoods, they are disproportionately exposed to environmental risk factors.

Moreover, gentrification enables and legitimises the exclusion of marginalised communities in multiple ways: 1) it devalues existing places and their residents in favour of regeneration, 2) it displaces longtime residents from regenerated neighbourhoods because of increasing property values, and/or 3) it alienates longtime residents as neighbourhood aesthetics, amenities and services change and become unaffordable and/or irrelevant.

As gentrification contributes to low-income households’ experiences of precarity and severs community ties and place attachments, it generates significant costs to personal and community health and wellbeing as well as social cohesion. The recommendations articulated in this brief emphasise the importance of transformative policy solutions that actively counter gentrification.
These include:
• Equitable investment in urban infrastructure
• Prioritising affordable housing
• Ensuring accessible transportation
• Empowering local communities
• Implementing a Te Tiriti o Waitangi approach to policy development

text: Countering gentrification in Tāmaki Makarau: Towards a framework for urban environmental justice This policy brief argues for urban policies that actively aim to end gentrification.

Gentrification is intimately tied to state-led processes of urban renewal. Though historically understood as the displacement of low-income households as an unfortunate byproduct of socioeconomic and demographic neighbourhood change, contemporary gentrification is constituted by profit-driven investment decisions that erase undervalued neighbourhoods and their communities in the name of urban renewal (variously referred to as redevelopment, regeneration, renaissance, or revitalisation).

These processes of gentrification fundamentally contribute to environmental injustice. At the same time as creating ‘zones of abundance’, neighbourhood regeneration projects simultaneously (re-)create ‘zones of neglect and sacrifice’, which are burdened with environmental risks. As low-income and ethnic minority households are more likely to either reside in or to be displaced into these neighbourhoods, they are disproportionately exposed to environmental risk factors.

Moreover, gentrification enables and legitimises the exclusion of marginalised communities in multiple ways: 1) it devalues existing places and their residents in favour of regeneration, 2) it displaces longtime residents from regenerated neighbourhoods because of increasing property values, and/or 3) it alienates longtime residents as neighbourhood aesthetics, amenities and services change and become unaffordable and/or irrelevant.

As gentrification contributes to low-income households’ experiences of precarity and severs community ties and place attachments, it generates significant costs to personal and community health and wellbeing as well as social cohesion. The recommendations articulated in this brief emphasise the importance of transformative policy solutions that actively counter gentrification.
These include:
• Equitable investment in urban infrastructure
• Prioritising affordable housing
• Ensuring accessible transportation
• Empowering local communities
• Implementing a Te Tiriti o Waitangi approach to policy development

year: 2025