title: Texture and chemistry of pyrite from the Waihi epithermal system, Hauraki Goldfield, New Zealand

authors: Eames, Anna G.

subjects: pyrite

abstract: The Waihi epithermal system is a low sulfidation epithermal system that hosts one of the largest epithermal Au-Ag deposits in the Southern Hemisphere. Various sulfide minerals are present within the system, including pyrite (FeS2), one of the most abundant sulfide minerals on Earth. Pyrite is an archive for hydrothermal fluid chemistry due to its crystal structure enabling incorporation of other elements such as Co, Ni, Se, As, Te. The presence or absence of these elements reflects the changes in the hydrothermal fluid chemistry throughout the growth of the grain. The textural variations in the grains indicates changes in growth conditions for each grain at the time of formation. The chemistry of each different zone, coupled with stages of growth, indicates the chemical influences on the pyrite in the Waihi system at that time. 

The use of petrographic, EPMA and LA-ICPMS analyses demonstrates distinctive textural zones within pyrite grains, varying in chemistry and appearance. Some zones contain elevated concentrations of Au and Ag, and varying concentrations of Cu, Pb or Zn. The textural observations indicate pyrite growth was interrupted by periods of dissolution before the grain continued growing. Most grains begin growth with high trace element concentrations. The lowest concentrations of trace elements occur in the outer growth phase. Inclusions are rich in Pb, Ca, Se, Zn, Au and Ni, and cause the ‘dirty’ texture observed in grains. The distinctive textural features are attributed to the varying concentrations in Au, As, Cu, Zn, Ag and Te. 

This research showcases the dynamics of hydrothermal fluid flow at Waihi, revealing that the gold-forming hydrothermal system at Waihi are more complex than initially thought. There is both evidence for periods of low gold pyrite growth, and periods of high pyrite growth.

text: Texture and chemistry of pyrite from the Waihi epithermal system, Hauraki Goldfield, New Zealand The Waihi epithermal system is a low sulfidation epithermal system that hosts one of the largest epithermal Au-Ag deposits in the Southern Hemisphere. Various sulfide minerals are present within the system, including pyrite (FeS2), one of the most abundant sulfide minerals on Earth. Pyrite is an archive for hydrothermal fluid chemistry due to its crystal structure enabling incorporation of other elements such as Co, Ni, Se, As, Te. The presence or absence of these elements reflects the changes in the hydrothermal fluid chemistry throughout the growth of the grain. The textural variations in the grains indicates changes in growth conditions for each grain at the time of formation. The chemistry of each different zone, coupled with stages of growth, indicates the chemical influences on the pyrite in the Waihi system at that time. 

The use of petrographic, EPMA and LA-ICPMS analyses demonstrates distinctive textural zones within pyrite grains, varying in chemistry and appearance. Some zones contain elevated concentrations of Au and Ag, and varying concentrations of Cu, Pb or Zn. The textural observations indicate pyrite growth was interrupted by periods of dissolution before the grain continued growing. Most grains begin growth with high trace element concentrations. The lowest concentrations of trace elements occur in the outer growth phase. Inclusions are rich in Pb, Ca, Se, Zn, Au and Ni, and cause the ‘dirty’ texture observed in grains. The distinctive textural features are attributed to the varying concentrations in Au, As, Cu, Zn, Ag and Te. 

This research showcases the dynamics of hydrothermal fluid flow at Waihi, revealing that the gold-forming hydrothermal system at Waihi are more complex than initially thought. There is both evidence for periods of low gold pyrite growth, and periods of high pyrite growth.

year: 2017

title: The relative effectiveness of alternative treatments for young children with attention deficit hyperactivity disorder

authors: Heriot, S.A.

abstract: The objective of this study was to evaluate the relative effectiveness of pharmacological and behavioural interventions for young children diagnosed with Attention Deficit Hyperactivity Disorder. A randomised between-groups (2 x 2) double blind design was used to compare four treatment conditions: (a) 0.3mg/kg methylphenidate and parent training programme; (b) 0.3mg/kg methylphenidate and parent support group; (c) placebo medication and parent training; and (d) placebo medication and parent support group. Treatment duration was approximately 8 weeks. The 16 families who completed the study involved children aged from 3 to 5 years and their parents (typically their mothers). All children met stringent diagnostic criteria for Attention Deficit Hyperactivity Disorder and five children also met diagnostic criteria for Oppositional Defiant Disorder. Changes were assessed on parent and teacher rating scales that measured problems with attention, activity and impulse control and oppositional/defiant behaviours, direct observation during compliance and attention tasks, cognitive measures (Continuous Performance Task), and parenting and family factors. Analysis of results showed that either active treatment component (i.e., methylphenidate versus parent training) was not better than the other. The combination of active treatment components however led to significant improvements in teacher ratings of behaviour associated with Attention Deficit Hyperactivity Disorder and oppositional defiant behaviour with a similar, although generally statistically nonsignificant, trend in parent ratings. There was a significant and large degree of variability in performance on the cognitive measures and statistical analysis of group differences was not feasible; however, examination of individual data indicated increases in sustained attention and ability to inhibit behaviour for all children receiving combined active treatments. During a compliance task, the number of repeat commands issued by mothers decreased and levels of child compliance increased significantly from pre- to post-intervention levels for the total sample, irrespective of treatment condition. The quality of family relationships also improved for the total sample. At post-intervention, 7 out of 16 children no longer met diagnostic criteria for Attention Deficit Hyperactivity Disorder and 2 out of 5 no longer met criteria for Oppositional Defiant Disorder. Several independent variables, such as gender, marital status, co-existing disorder, severity of behavioural problems, and level of parental warmth and family relationships, were found not to be predictive of post-intervention status. Findings are discussed within the framework of a transactional model. Analysis of the current data set indicates that successful outcomes for young children, at least in the short term, are more likely following combined treatments. Outcomes however may depend less upon the type of treatment per se than on whether treatment leads to changes in critical child-parent interactions, such as improvement in parental attitudes and positive attention towards the child.

text: The relative effectiveness of alternative treatments for young children with attention deficit hyperactivity disorder The objective of this study was to evaluate the relative effectiveness of pharmacological and behavioural interventions for young children diagnosed with Attention Deficit Hyperactivity Disorder. A randomised between-groups (2 x 2) double blind design was used to compare four treatment conditions: (a) 0.3mg/kg methylphenidate and parent training programme; (b) 0.3mg/kg methylphenidate and parent support group; (c) placebo medication and parent training; and (d) placebo medication and parent support group. Treatment duration was approximately 8 weeks. The 16 families who completed the study involved children aged from 3 to 5 years and their parents (typically their mothers). All children met stringent diagnostic criteria for Attention Deficit Hyperactivity Disorder and five children also met diagnostic criteria for Oppositional Defiant Disorder. Changes were assessed on parent and teacher rating scales that measured problems with attention, activity and impulse control and oppositional/defiant behaviours, direct observation during compliance and attention tasks, cognitive measures (Continuous Performance Task), and parenting and family factors. Analysis of results showed that either active treatment component (i.e., methylphenidate versus parent training) was not better than the other. The combination of active treatment components however led to significant improvements in teacher ratings of behaviour associated with Attention Deficit Hyperactivity Disorder and oppositional defiant behaviour with a similar, although generally statistically nonsignificant, trend in parent ratings. There was a significant and large degree of variability in performance on the cognitive measures and statistical analysis of group differences was not feasible; however, examination of individual data indicated increases in sustained attention and ability to inhibit behaviour for all children receiving combined active treatments. During a compliance task, the number of repeat commands issued by mothers decreased and levels of child compliance increased significantly from pre- to post-intervention levels for the total sample, irrespective of treatment condition. The quality of family relationships also improved for the total sample. At post-intervention, 7 out of 16 children no longer met diagnostic criteria for Attention Deficit Hyperactivity Disorder and 2 out of 5 no longer met criteria for Oppositional Defiant Disorder. Several independent variables, such as gender, marital status, co-existing disorder, severity of behavioural problems, and level of parental warmth and family relationships, were found not to be predictive of post-intervention status. Findings are discussed within the framework of a transactional model. Analysis of the current data set indicates that successful outcomes for young children, at least in the short term, are more likely following combined treatments. Outcomes however may depend less upon the type of treatment per se than on whether treatment leads to changes in critical child-parent interactions, such as improvement in parental attitudes and positive attention towards the child.

year: 1999

title: Using gamification to support positive health behaviour change: A kaupapa Māori approach

authors: Jefferies, Dannette (Dannie) Louise

subjects: Gamification

abstract: As our lives become increasingly technology-dependent, healthcare practitioners and researchers recognise the opportunities to deliver effective digital healthcare initiatives to improve patient outcomes. Gamification is one such technological approach to consider. While some important work has been done in gamification, to date, there have been few gamified healthy lifestyle intervention studies undertaken within an Indigenous or minority population. Therefore, this research extends the current knowledge of gamification with a focus on an Indigenous population.
Māori are the Indigenous People of New Zealand, and as in many other colonised countries, Māori are over-represented in obesity statistics; a factor which contributes to significant health inequities, such as a higher incidence of chronic illness among Māori people. Gamification may be an effective means of supporting positive lifestyle choices (e.g., increased physical activity) to reduce the prevalence of chronic illness. This research takes a Kaupapa Māori approach to address the research question: How can gamification support positive health behaviour change? Kaupapa Māori is a philosophical Māori-centric approach that ensures tino rangatiratanga (the right to self-determination). The research approach follows Māori tikanga (customary practices) and recognises the importance of Te Reo Māori (Māori language) and Te Ao Māori (a Māori worldview).
This research followed a design science research (DSR) process and consisted of two phases: Phase One was a prototype design phase, and Phase Two evaluated the prototype. Phase One involved a series of co-design hui (focus groups) to explore the social context and health aspirations of Māori and to ideate potential solutions. Phase One found that normative beliefs strongly influence effective gamification design preference for Māori and that culturally-tailored design is effective for Māori; a notion that contradicts previous Western-oriented gamification implementations. Phase Two consisted of a cross-sectional survey and regression analysis to evaluate the prototype designed during Phase One. Major findings from Phase Two show that three critical factors predict whether Māori users would use the gamified intervention: Perceived Ease-of-Use; Māori-Centric Design; and the use of Whakataetae (competitive) persuasive design strategies.  
This research contributes to gamification literature by identifying the gamification elements that most significantly impact behavioural intention toward gamified health applications for Māori; knowledge that may be transferable to other Indigenous populations. The importance of implementing a competitive strategy contradicts previous literature on collectivist cultures and guides the development of future gamified interventions. This research also contributes to theoretical and practical knowledge by demonstrating that effective persuasive strategies are not universal; Māori-centric design is a self-determined approach that keeps the needs of the target audience central to the design of a solution. This research provides theory-driven practical guidelines for design processes and design decisions that are driven by the needs and aspirations of Māori.

text: Using gamification to support positive health behaviour change: A kaupapa Māori approach As our lives become increasingly technology-dependent, healthcare practitioners and researchers recognise the opportunities to deliver effective digital healthcare initiatives to improve patient outcomes. Gamification is one such technological approach to consider. While some important work has been done in gamification, to date, there have been few gamified healthy lifestyle intervention studies undertaken within an Indigenous or minority population. Therefore, this research extends the current knowledge of gamification with a focus on an Indigenous population.
Māori are the Indigenous People of New Zealand, and as in many other colonised countries, Māori are over-represented in obesity statistics; a factor which contributes to significant health inequities, such as a higher incidence of chronic illness among Māori people. Gamification may be an effective means of supporting positive lifestyle choices (e.g., increased physical activity) to reduce the prevalence of chronic illness. This research takes a Kaupapa Māori approach to address the research question: How can gamification support positive health behaviour change? Kaupapa Māori is a philosophical Māori-centric approach that ensures tino rangatiratanga (the right to self-determination). The research approach follows Māori tikanga (customary practices) and recognises the importance of Te Reo Māori (Māori language) and Te Ao Māori (a Māori worldview).
This research followed a design science research (DSR) process and consisted of two phases: Phase One was a prototype design phase, and Phase Two evaluated the prototype. Phase One involved a series of co-design hui (focus groups) to explore the social context and health aspirations of Māori and to ideate potential solutions. Phase One found that normative beliefs strongly influence effective gamification design preference for Māori and that culturally-tailored design is effective for Māori; a notion that contradicts previous Western-oriented gamification implementations. Phase Two consisted of a cross-sectional survey and regression analysis to evaluate the prototype designed during Phase One. Major findings from Phase Two show that three critical factors predict whether Māori users would use the gamified intervention: Perceived Ease-of-Use; Māori-Centric Design; and the use of Whakataetae (competitive) persuasive design strategies.  
This research contributes to gamification literature by identifying the gamification elements that most significantly impact behavioural intention toward gamified health applications for Māori; knowledge that may be transferable to other Indigenous populations. The importance of implementing a competitive strategy contradicts previous literature on collectivist cultures and guides the development of future gamified interventions. This research also contributes to theoretical and practical knowledge by demonstrating that effective persuasive strategies are not universal; Māori-centric design is a self-determined approach that keeps the needs of the target audience central to the design of a solution. This research provides theory-driven practical guidelines for design processes and design decisions that are driven by the needs and aspirations of Māori.

year: 2023