title: The preparation and characterisation of monomeric and linked metal carbonyl clusters containing the closo-Si2Co4 pseudo-octahedral core

authors: Evans, Cameron

abstract: PhSiH3 reacts with [Co₄(CO)₁₂] at 50 °C in hydrocarbon solvents to give [(µ₄-SiPh)₂Co₄(CO)₁₁], 2c, shown by an X-ray crystal structure determination to have a pseudo-octahedral Si₂Co₄ core. Substituted aryl-silanes behaved similarly. Mixtures of PhSiH₃, H₃SiC₆H₄SiH₃ and [Co₄(CO)₁₂] in a ca. 2  1  2 ratio gave the dimeric cluster [{Co₄(µ₄-SiPh)(CO)₁₁Si}₂C₆H₄], 3a, which has the two Si₂Co₄ cores linked by a C₆H₄ group to give a rigid molecule which an X-ray structure analysis shows to be over 23 Å long. Related dimers linked by –(CH₂)₈– groups were isolated from mixtures of PhSiH₃, α ,ω-(H₃Si)₂(CH₂)₈ and [Co₄(CO)₁₂]. Electrochemical studies show the two cluster units in 3a do not interact electronically.

text: The preparation and characterisation of monomeric and linked metal carbonyl clusters containing the closo-Si2Co4 pseudo-octahedral core PhSiH3 reacts with [Co₄(CO)₁₂] at 50 °C in hydrocarbon solvents to give [(µ₄-SiPh)₂Co₄(CO)₁₁], 2c, shown by an X-ray crystal structure determination to have a pseudo-octahedral Si₂Co₄ core. Substituted aryl-silanes behaved similarly. Mixtures of PhSiH₃, H₃SiC₆H₄SiH₃ and [Co₄(CO)₁₂] in a ca. 2  1  2 ratio gave the dimeric cluster [{Co₄(µ₄-SiPh)(CO)₁₁Si}₂C₆H₄], 3a, which has the two Si₂Co₄ cores linked by a C₆H₄ group to give a rigid molecule which an X-ray structure analysis shows to be over 23 Å long. Related dimers linked by –(CH₂)₈– groups were isolated from mixtures of PhSiH₃, α ,ω-(H₃Si)₂(CH₂)₈ and [Co₄(CO)₁₂]. Electrochemical studies show the two cluster units in 3a do not interact electronically.

year: 2002-01-01

title: New Zealand’s National Standards policy: How should we view it a decade on?

authors: Thrupp, Martin

abstract: In this short article, I consider how teachers might judge the National Standards system these days and also how the policy might be understood more generally. These are important questions coming up to the 2017 election because the National Standards system has been such a central feature of the current Government’s approach to education. Teachers will be aware of teacher and principal colleagues who are supportive of National Standards while others are much less so. Conflicting views amongst teachers and principals about the value of the National Standards is also apparent from a recent New Zealand Council for Educational Research (NZCER) national survey (Bonne, 2016). School websites indicate diverse views as well. There are some primary school websites that reflect enthusiasm about National Standards and some that barely mention them.

text: New Zealand’s National Standards policy: How should we view it a decade on? In this short article, I consider how teachers might judge the National Standards system these days and also how the policy might be understood more generally. These are important questions coming up to the 2017 election because the National Standards system has been such a central feature of the current Government’s approach to education. Teachers will be aware of teacher and principal colleagues who are supportive of National Standards while others are much less so. Conflicting views amongst teachers and principals about the value of the National Standards is also apparent from a recent New Zealand Council for Educational Research (NZCER) national survey (Bonne, 2016). School websites indicate diverse views as well. There are some primary school websites that reflect enthusiasm about National Standards and some that barely mention them.

year: 2017

title: Prototypical gang recruits in New Zealand prisons

authors: Lett, Daniel

subjects: Gangs

abstract: Gangs have long been associated with antisocial behaviour and crime. To maintain themselves, gangs require a steady flow of new recruits. A better understanding of who is being recruited into gangs is the first step in preventing recruitment and lowering the impact of gangs on society. We asked what the prototypical gang recruit in New Zealand prisons is? To answer this, we needed to establish which factors are most likely to make someone more prototypical. Using these factors as our focus, we completed a series of difference of proportion analyses on archival data acquired through Te Ara Poutama. We found that the most prototypical factors for a gang recruit in New Zealand prisons were being a Māori, repeat offender, with a medium RoC*RoI, convicted of violent crimes, being held in a high security unit, and being between the ages of 20-39. These results suggest that prototypicality for gang recruits varies across settings.

text: Prototypical gang recruits in New Zealand prisons Gangs have long been associated with antisocial behaviour and crime. To maintain themselves, gangs require a steady flow of new recruits. A better understanding of who is being recruited into gangs is the first step in preventing recruitment and lowering the impact of gangs on society. We asked what the prototypical gang recruit in New Zealand prisons is? To answer this, we needed to establish which factors are most likely to make someone more prototypical. Using these factors as our focus, we completed a series of difference of proportion analyses on archival data acquired through Te Ara Poutama. We found that the most prototypical factors for a gang recruit in New Zealand prisons were being a Māori, repeat offender, with a medium RoC*RoI, convicted of violent crimes, being held in a high security unit, and being between the ages of 20-39. These results suggest that prototypicality for gang recruits varies across settings.

year: 2021