title: A symmetric and interconnected skeleton structural (SISS) model for predicting thermal and electrical conductivity and Young’s modulus of porous foams

authors: Wang, Jianfeng

subjects: modelling

abstract: A symmetric and interconnected skeleton structural (SISS) model is proposed for predicting the thermal and electrical conductivities and Young’s modulus of open-cell foams with hollow and solid struts. The model predicted the effective thermal and electrical conductivities of solid-strut aluminium foams and other open-cell foams for the entire porosity range. The SISS model provided upper and lower bounds for the effective thermal conductivity and Young’s modulus of hollow-strut open-cell nickel foams. The SISS model was also found to predict the effective thermal conductivity of closed-cell graphite foams, and the effective electrical conductivity and Young’s modulus of closed-cell aluminium foams with reasonable accuracy. By analogy, the SISS model might also be applied to other physical properties.

text: A symmetric and interconnected skeleton structural (SISS) model for predicting thermal and electrical conductivity and Young’s modulus of porous foams A symmetric and interconnected skeleton structural (SISS) model is proposed for predicting the thermal and electrical conductivities and Young’s modulus of open-cell foams with hollow and solid struts. The model predicted the effective thermal and electrical conductivities of solid-strut aluminium foams and other open-cell foams for the entire porosity range. The SISS model provided upper and lower bounds for the effective thermal conductivity and Young’s modulus of hollow-strut open-cell nickel foams. The SISS model was also found to predict the effective thermal conductivity of closed-cell graphite foams, and the effective electrical conductivity and Young’s modulus of closed-cell aluminium foams with reasonable accuracy. By analogy, the SISS model might also be applied to other physical properties.

year: 2008

title: The challenge of integrating non-continuous processes-milk powder plant case study

authors: Atkins, Martin John

subjects: milk production

abstract: The integration of non-continuous processes such as a milk powder plant present a challenge for existing process integration techniques. Current techniques are generally based on steady and continuous operation which for some industries is not the case. Milk production varies considerably during the year as dairy cows in New Zealand are grazed on pasture, which affects the scheduling and operation of plants on site. The frequency and duration of cleaning cycles and non-productive operating states can have a major affect on energy demand and the availability of heat sources and heat sinks. In this paper the potential for indirect heat transfer between the several plants using a heat recovery loop and stratified tank at a typical New Zealand dairy factory is investigated. The maximum amount of heat recovery is calculated for a range of recirculation loop temperatures. The maximum amount of heat recovery can be increased considerably if the temperature of the hot fluid in the recirculation loop is varied depending on which condition the site is operating under.

text: The challenge of integrating non-continuous processes-milk powder plant case study The integration of non-continuous processes such as a milk powder plant present a challenge for existing process integration techniques. Current techniques are generally based on steady and continuous operation which for some industries is not the case. Milk production varies considerably during the year as dairy cows in New Zealand are grazed on pasture, which affects the scheduling and operation of plants on site. The frequency and duration of cleaning cycles and non-productive operating states can have a major affect on energy demand and the availability of heat sources and heat sinks. In this paper the potential for indirect heat transfer between the several plants using a heat recovery loop and stratified tank at a typical New Zealand dairy factory is investigated. The maximum amount of heat recovery is calculated for a range of recirculation loop temperatures. The maximum amount of heat recovery can be increased considerably if the temperature of the hot fluid in the recirculation loop is varied depending on which condition the site is operating under.

year: 2009

title: Beyond Pākehā paralysis: Exploring the journeys & experiences of Pākehā allyship in psychology

authors: Stolte, Ottilie Emma Elisabeth

abstract: The monocultural foundation of psychology is interwoven with the colonial history of Aotearoa New Zealand. Not all of the mahi of decolonising psychology is the responsibility of Māori. In Aotearoa, there is currently less literature around the development of racial justice allyship and how Pākehā (as the dominant majority) can work towards honouring Te Tiriti o Waitangi. This paper draws on interviews with three Pākehā allies who have taken actions towards greater inclusion of Māori and raising awareness of systemic injustices and racial disparities. The objective of this paper is to document the understandings shared by these ‘reluctant allies’, focusing on the challenges, possibilities, and suggestions for a more culturally relevant psychological education and practice for Aotearoa New Zealand.

text: Beyond Pākehā paralysis: Exploring the journeys & experiences of Pākehā allyship in psychology The monocultural foundation of psychology is interwoven with the colonial history of Aotearoa New Zealand. Not all of the mahi of decolonising psychology is the responsibility of Māori. In Aotearoa, there is currently less literature around the development of racial justice allyship and how Pākehā (as the dominant majority) can work towards honouring Te Tiriti o Waitangi. This paper draws on interviews with three Pākehā allies who have taken actions towards greater inclusion of Māori and raising awareness of systemic injustices and racial disparities. The objective of this paper is to document the understandings shared by these ‘reluctant allies’, focusing on the challenges, possibilities, and suggestions for a more culturally relevant psychological education and practice for Aotearoa New Zealand.

year: 2025