title: Turbulence transport throughout the heliosphere

authors: Breech, Ben

subjects: mathematics

abstract: We employ a turbulence transport model to compute distributions of turbulence throughout the heliosphere. The model determines the radial dependence of three (coupled) quantities that characterize interplanetary turbulence, the energy per unit mass, the cross helicity or Alfvénicity, and a similarity length scale. A fourth integrated quantity, the plasma temperature, is modified by heat deposition due to turbulent dissipation. The model includes advection, expansion, and reflection effects as well as the tendency toward dynamic alignment, and a von Kármán type dissipation function that represents decay of turbulence due to cascade to small scales. Two types of forcing are also featured, one a simple model of stream shear, and the other a driving in the outer heliosphere associated with wave energy injection due to pickup protons of interstellar origin. Parameters for the model have been tuned using observation data from Voyager and Ulysses. We analyze the constraining observations to provide boundary conditions and parameters that vary with heliocentric latitude, with some extrapolations. The fully assembled model permits the computation of the distribution of turbulence throughout the entire heliosphere, and we present solutions for several appropriate parameter sets.

text: Turbulence transport throughout the heliosphere We employ a turbulence transport model to compute distributions of turbulence throughout the heliosphere. The model determines the radial dependence of three (coupled) quantities that characterize interplanetary turbulence, the energy per unit mass, the cross helicity or Alfvénicity, and a similarity length scale. A fourth integrated quantity, the plasma temperature, is modified by heat deposition due to turbulent dissipation. The model includes advection, expansion, and reflection effects as well as the tendency toward dynamic alignment, and a von Kármán type dissipation function that represents decay of turbulence due to cascade to small scales. Two types of forcing are also featured, one a simple model of stream shear, and the other a driving in the outer heliosphere associated with wave energy injection due to pickup protons of interstellar origin. Parameters for the model have been tuned using observation data from Voyager and Ulysses. We analyze the constraining observations to provide boundary conditions and parameters that vary with heliocentric latitude, with some extrapolations. The fully assembled model permits the computation of the distribution of turbulence throughout the entire heliosphere, and we present solutions for several appropriate parameter sets.

year: 2007

title: Fa’afatāmanu talafeagai mo lesona fa’asaienisi: O le tu’ualalo mo a’oga a faia’oga saienisi fa’aōliōli. A culturally appropriate formative assessment in science lessons: Implications for initial science teacher education.

authors: Lee-Hang, Desmond Mene

subjects: culturally appropriate

abstract: This study set out to find the views of Samoan teachers on formative assessment and to document any cultural aspects of the fa’aSamoa (or Samoan culture) that could hinder the use of formative assessment in science classrooms. In addition, the research was also an opportunity for professional development of teachers on doing formative assessment. The culturally constructed le-tautala or pupil silence in the classrooms that was mentioned by teachers seemed to hinder formative interactions in classrooms. Written worksheets from this study seemed to be culturally appropriate for doing formative assessment because it provided a way to overcome le-tautala, since the worksheets solicited responses from all pupils. At the same time these written formative assessment worksheets have the potential to enhance Samoan pupils learning of science concepts because of the opportunity provided for feedback and feedforward.

text: Fa’afatāmanu talafeagai mo lesona fa’asaienisi: O le tu’ualalo mo a’oga a faia’oga saienisi fa’aōliōli. A culturally appropriate formative assessment in science lessons: Implications for initial science teacher education. This study set out to find the views of Samoan teachers on formative assessment and to document any cultural aspects of the fa’aSamoa (or Samoan culture) that could hinder the use of formative assessment in science classrooms. In addition, the research was also an opportunity for professional development of teachers on doing formative assessment. The culturally constructed le-tautala or pupil silence in the classrooms that was mentioned by teachers seemed to hinder formative interactions in classrooms. Written worksheets from this study seemed to be culturally appropriate for doing formative assessment because it provided a way to overcome le-tautala, since the worksheets solicited responses from all pupils. At the same time these written formative assessment worksheets have the potential to enhance Samoan pupils learning of science concepts because of the opportunity provided for feedback and feedforward.

year: 2011

title: Co-constructions of gender and ethnicity in New Zealand television advertising

authors: Michelle, Carolyn

subjects: television advertising

abstract: This paper reports key findings from a content analysis of gender and ethnic depictions in a sample of 2,120 New Zealand prime-time television advertisements screened in 2006. The study explored the following questions: With what product categories are male and female White, Māori/Pasifika and Asian characters most commonly associated? What are the most common occupational roles of male and female White, Māori/Pasifika and Asian characters? The results reveal highly stereotypical depictions of women and men within each ethnic category. White men dominated advertisements for foodstuffs, telecommunications and financial/corporate/legal services and were over-represented as professionals/white collar workers, while White women were over-represented in advertisements for household products, personal products, and medical products and featured predominantly as homemakers. Māori/Pasifika men were over-represented as athletes and service and sales workers. Non-White women featured prominently within multi-ethnic groups in advertisements for personal grooming products and most frequently featured as glamour models, while non-White men were over-represented as blue collar workers. Largely absent were Māori/Pasifika women and Asians of both genders, potentially exacerbating the multiple axes of subordination encountered by these groups in the New Zealand context.

text: Co-constructions of gender and ethnicity in New Zealand television advertising This paper reports key findings from a content analysis of gender and ethnic depictions in a sample of 2,120 New Zealand prime-time television advertisements screened in 2006. The study explored the following questions: With what product categories are male and female White, Māori/Pasifika and Asian characters most commonly associated? What are the most common occupational roles of male and female White, Māori/Pasifika and Asian characters? The results reveal highly stereotypical depictions of women and men within each ethnic category. White men dominated advertisements for foodstuffs, telecommunications and financial/corporate/legal services and were over-represented as professionals/white collar workers, while White women were over-represented in advertisements for household products, personal products, and medical products and featured predominantly as homemakers. Māori/Pasifika men were over-represented as athletes and service and sales workers. Non-White women featured prominently within multi-ethnic groups in advertisements for personal grooming products and most frequently featured as glamour models, while non-White men were over-represented as blue collar workers. Largely absent were Māori/Pasifika women and Asians of both genders, potentially exacerbating the multiple axes of subordination encountered by these groups in the New Zealand context.

year: 2011