title: Effect of microwave sintering parameters on the physical and mechanical properties of pure Ti and blended elemental Ti alloys

authors: Raynova, Stiliana (Stella) Rousseva

subjects: Microwave sintering

abstract: Microwave sintering (MWS) was used to consolidate hydride de-hydride Ti powder and blended elemental Ti6Al4V, Ti5Fe and Ti5Al5Mo5V3Cr (Ti5553) powder mixtures. The amount of powders used to prepare the powder compacts was scaled up to 500g.The effect of the MWS conditions on the relative density, porosity distribution, microstructure and tensile properties were studied. Furthermore, uniformity in distribution of the alloying elements was checked. For most of the materials considered, a combinations of sintering temperature of 1200ºC and 1300ºC and holding time of 5 to 30 min resulted in significantly improved density. Nevertheless sintering temperature of at least 1300ºC was required for pore coalescence and high tensile properties.

text: Effect of microwave sintering parameters on the physical and mechanical properties of pure Ti and blended elemental Ti alloys Microwave sintering (MWS) was used to consolidate hydride de-hydride Ti powder and blended elemental Ti6Al4V, Ti5Fe and Ti5Al5Mo5V3Cr (Ti5553) powder mixtures. The amount of powders used to prepare the powder compacts was scaled up to 500g.The effect of the MWS conditions on the relative density, porosity distribution, microstructure and tensile properties were studied. Furthermore, uniformity in distribution of the alloying elements was checked. For most of the materials considered, a combinations of sintering temperature of 1200ºC and 1300ºC and holding time of 5 to 30 min resulted in significantly improved density. Nevertheless sintering temperature of at least 1300ºC was required for pore coalescence and high tensile properties.

year: 2018

title: Explicitly correlated intermolecular distances and interaction energies of hydrogen bonded complexes

authors: Lane, Joseph R.

subjects: chemistry

abstract: We have optimized the lowest energy structures and calculated interaction energies for the H2O–H2O, H2O–H2S, H2O–NH3, and H2O–PH3 dimers with the recently developed explicitly correlated CCSD(T)-F12 methods and the associated VXZ-F12 (where X=D,T,Q) basis sets. For a given cardinal number, we find that the results obtained with the CCSD(T)-F12 methods are much closer to the CCSD(T) complete basis set limit than the conventional CCSD(T) results. In general we find that CCSD(T)-F12 results obtained with the VTZ-F12 basis set are better than the conventional CCSD(T) results obtained with an aug-cc-pV5Z basis set. We also investigate two ways to reduce the effects of basis set superposition error with conventional CCSD(T), namely, the popular counterpoise correction and limiting diffuse basis functions to the heavy atoms only. We find that for a given cardinal number, these selectively augmented correlation consistent basis sets yield results that are closer to the complete basis set limit than the corresponding fully augmented basis sets. Furthermore, we find that the difference between standard and counterpoise corrected interaction energies and intermolecular distances is reduced with the selectively augmented basis sets.

text: Explicitly correlated intermolecular distances and interaction energies of hydrogen bonded complexes We have optimized the lowest energy structures and calculated interaction energies for the H2O–H2O, H2O–H2S, H2O–NH3, and H2O–PH3 dimers with the recently developed explicitly correlated CCSD(T)-F12 methods and the associated VXZ-F12 (where X=D,T,Q) basis sets. For a given cardinal number, we find that the results obtained with the CCSD(T)-F12 methods are much closer to the CCSD(T) complete basis set limit than the conventional CCSD(T) results. In general we find that CCSD(T)-F12 results obtained with the VTZ-F12 basis set are better than the conventional CCSD(T) results obtained with an aug-cc-pV5Z basis set. We also investigate two ways to reduce the effects of basis set superposition error with conventional CCSD(T), namely, the popular counterpoise correction and limiting diffuse basis functions to the heavy atoms only. We find that for a given cardinal number, these selectively augmented correlation consistent basis sets yield results that are closer to the complete basis set limit than the corresponding fully augmented basis sets. Furthermore, we find that the difference between standard and counterpoise corrected interaction energies and intermolecular distances is reduced with the selectively augmented basis sets.

year: 2009

title: "More than bloods and obs" - Whānau Māori discuss health and hospital care

authors: Masters-Awatere, Bridgette

abstract: The impact of colonisation on Māori, the Indigenous people of Aotearoa New Zealand, combined with negative interactions with health workers, has contributed to insufficient resources and reduced access to primary health care. The purpose of this report is to share narratives of whānau Māori who have experienced a child’s hospital admission in order to highlight the common aspects (good and bad) of their stay at Waikato Hospital. The overarching aim of the Harti Hauora Tamariki (HHT) tool trial, within which this report is located, is to demonstrate the measurable impact of a developed screening tool (referred to throughout as the Harti tool). The Harti tool is a comprehensive approach to assessing and addressing holistic health needs for hospitalised children and their whānau. Our recruitment strategy gave priority to those whose kōrero would capture the realities of those living in situations of few resources. This report presents findings from conversational interviews with whānau of tamariki Māori admitted to the paediatrics ward of Waikato Hospital. We have purposefully presented the interview findings as narratives to allow the reader to engage in their own interpretation of commonalities of experiences. Each case study follows the same format: an overview, their hospital experience, and their description of everyday health. Across all the cases, similarities of experience emerge; financial stressors and strain; hunger and isolation; concern for their child(ren); and families that are actively engaged in caring for their children’s health and well-being. The Harti tool, when administered by a culturally competent Harti Research Assistant (Harti RA), appears to work to counteract previous alienating experiences. Being treated with dignity, respect and value had a positive impact. Participants spoke at length regarding how wonderful it was to be able to engage with the Harti RA’s as Māori and in a culturally appropriate way.

text: "More than bloods and obs" - Whānau Māori discuss health and hospital care The impact of colonisation on Māori, the Indigenous people of Aotearoa New Zealand, combined with negative interactions with health workers, has contributed to insufficient resources and reduced access to primary health care. The purpose of this report is to share narratives of whānau Māori who have experienced a child’s hospital admission in order to highlight the common aspects (good and bad) of their stay at Waikato Hospital. The overarching aim of the Harti Hauora Tamariki (HHT) tool trial, within which this report is located, is to demonstrate the measurable impact of a developed screening tool (referred to throughout as the Harti tool). The Harti tool is a comprehensive approach to assessing and addressing holistic health needs for hospitalised children and their whānau. Our recruitment strategy gave priority to those whose kōrero would capture the realities of those living in situations of few resources. This report presents findings from conversational interviews with whānau of tamariki Māori admitted to the paediatrics ward of Waikato Hospital. We have purposefully presented the interview findings as narratives to allow the reader to engage in their own interpretation of commonalities of experiences. Each case study follows the same format: an overview, their hospital experience, and their description of everyday health. Across all the cases, similarities of experience emerge; financial stressors and strain; hunger and isolation; concern for their child(ren); and families that are actively engaged in caring for their children’s health and well-being. The Harti tool, when administered by a culturally competent Harti Research Assistant (Harti RA), appears to work to counteract previous alienating experiences. Being treated with dignity, respect and value had a positive impact. Participants spoke at length regarding how wonderful it was to be able to engage with the Harti RA’s as Māori and in a culturally appropriate way.

year: 2019