title: Conditions for sustainment of magnetohydrodynamic turbulence driven by Alfvén waves

authors: Dmitruk, Pablo

subjects: Alfvén waves

abstract: In a number of space and astrophysical plasmas,turbulence is driven by the supply of wave energy. In the context of incompressible magnetohydrodynamics (MHD) there are basic physical reasons, associated with conservation of cross helicity, why this kind of driving may be ineffective in sustaining turbulence. Here an investigation is made into some basic requirements for sustaining steady turbulence and dissipation in the context of incompressible MHD in a weakly inhomogeneous open field line region, driven by the supply of unidirectionally propagating waves at a boundary. While such wave driving cannot alone sustain turbulence, the addition of reflection permits sustainment. Another sustainment issue is the action of the nonpropagating or quasi-two dimensional part of the spectrum; this is particularly important in setting up a steady cascade. Thus, details of the waveboundary conditions also affect the ease of sustaining a cascade. Supply of a broadband spectrum of waves can overcome the latter difficulty but not the former, that is, the need for reflections. Implications for coronal heating and other astrophysical applications, as well as simulations, are suggested.

text: Conditions for sustainment of magnetohydrodynamic turbulence driven by Alfvén waves In a number of space and astrophysical plasmas,turbulence is driven by the supply of wave energy. In the context of incompressible magnetohydrodynamics (MHD) there are basic physical reasons, associated with conservation of cross helicity, why this kind of driving may be ineffective in sustaining turbulence. Here an investigation is made into some basic requirements for sustaining steady turbulence and dissipation in the context of incompressible MHD in a weakly inhomogeneous open field line region, driven by the supply of unidirectionally propagating waves at a boundary. While such wave driving cannot alone sustain turbulence, the addition of reflection permits sustainment. Another sustainment issue is the action of the nonpropagating or quasi-two dimensional part of the spectrum; this is particularly important in setting up a steady cascade. Thus, details of the waveboundary conditions also affect the ease of sustaining a cascade. Supply of a broadband spectrum of waves can overcome the latter difficulty but not the former, that is, the need for reflections. Implications for coronal heating and other astrophysical applications, as well as simulations, are suggested.

year: 2001

title: An overview of mining in the Te Aroha mining district from the turn of the twentieth century until the start of the depression

authors: Hart, Philip

abstract: Apart from the mines owned by Edwin Henry Hardy, mining at Waiorongomai stagnated in the early twentieth century. During its first decade attention largely switched to the Tui district, with new treatment processes promising better results, but, as usual, raising capital was difficult and the government was asked to assist. A mining revival was constantly anticipated, especially by the local newspaper, and for the first time base metals were also investigated. Prospecting encompassed new areas, with the Mangakino Valley and the top of the mountain being investigated more thoroughly than previously.
In 1913, the battery was destroyed in a fire but was replaced. During that decade and the subsequent one, mining faded away to almost nothing, and only the onset of the Depression caused any revival.

text: An overview of mining in the Te Aroha mining district from the turn of the twentieth century until the start of the depression Apart from the mines owned by Edwin Henry Hardy, mining at Waiorongomai stagnated in the early twentieth century. During its first decade attention largely switched to the Tui district, with new treatment processes promising better results, but, as usual, raising capital was difficult and the government was asked to assist. A mining revival was constantly anticipated, especially by the local newspaper, and for the first time base metals were also investigated. Prospecting encompassed new areas, with the Mangakino Valley and the top of the mountain being investigated more thoroughly than previously.
In 1913, the battery was destroyed in a fire but was replaced. During that decade and the subsequent one, mining faded away to almost nothing, and only the onset of the Depression caused any revival.

year: 2016

title: Māori and pacific infant and toddler cultural pedagogy: Reclaiming a cultural lens

authors: Glasgow, Ali

abstract: An Indigenous cultural renaissance emerged in the 1980’s in Aotearoa New Zealand. Communities established early childhood programmes that reflected native spirituality, values, and Indigenous knowledge, with instruction in local, Indigenous languages (Hunkin-Tuiletufuga, 2001). Indigenous communities sought ownership over the education of their children, within a culturally driven framework that focussed on retention of knowledge, language, and cultural identity.
These strong early stages have lost traction, with increasing numbers of Māori and Pacific community services unable to meet the rigorous regulatory criteria, assurance auditing processes, funding restraints, and other considerations that have impacted the numbers of families using these services. Nowadays, a mere percentage of those once in operation remain, with the majority of Māori and Pacific children and their families enrolling in mainstream early childhood education services (Ministry of Education, 2013).
Central to the educational success for Māori and Pacific children is an understanding that they are culturally located and the acknowledgement that effective education must encompass their culture. A cultural discourse gaining prominence reveals the need for culturally sound pedagogical practice for Māori and Pacific communities (Rameka & Glasgow, 2016; Rau & Ritchie, 2011). This trend is gaining impetus in the wider Pacific region (Glasgow, 2012), thus driving a movement for reclaiming and reframing education for Pacific peoples (Sanga, 2012).

text: Māori and pacific infant and toddler cultural pedagogy: Reclaiming a cultural lens An Indigenous cultural renaissance emerged in the 1980’s in Aotearoa New Zealand. Communities established early childhood programmes that reflected native spirituality, values, and Indigenous knowledge, with instruction in local, Indigenous languages (Hunkin-Tuiletufuga, 2001). Indigenous communities sought ownership over the education of their children, within a culturally driven framework that focussed on retention of knowledge, language, and cultural identity.
These strong early stages have lost traction, with increasing numbers of Māori and Pacific community services unable to meet the rigorous regulatory criteria, assurance auditing processes, funding restraints, and other considerations that have impacted the numbers of families using these services. Nowadays, a mere percentage of those once in operation remain, with the majority of Māori and Pacific children and their families enrolling in mainstream early childhood education services (Ministry of Education, 2013).
Central to the educational success for Māori and Pacific children is an understanding that they are culturally located and the acknowledgement that effective education must encompass their culture. A cultural discourse gaining prominence reveals the need for culturally sound pedagogical practice for Māori and Pacific communities (Rameka & Glasgow, 2016; Rau & Ritchie, 2011). This trend is gaining impetus in the wider Pacific region (Glasgow, 2012), thus driving a movement for reclaiming and reframing education for Pacific peoples (Sanga, 2012).

year: 2017