title: Proof of concept of diffuse optical tomography using time-of-flight range imaging cameras

authors: Hassan, Ahmad

subjects: diffuse optical tomography

abstract: Diffuse optical tomography is an optical technique to create 3-dimensional images of the inside of highly scattering material. Research groups around the world have been developing imaging systems using various source-detector arrangements to determine optical properties of biological tissue with a focus on medical applications. In this paper we investigate whether a range imaging camera can be used as a detector array. We used time-of-flight range imaging cameras instead of the conventional source-detector array used by others. The results provided in this paper show reconstructed images of absorption and reduced scattering of an object submerged in a tissue simulating phantom. Using the ranging camera XZ422 Demonstrator and the NIRFAST software package, we reconstructed 2D images of a 6 mm metal rod submerged in the centre of a 5 cm deep tank filled with 1% IntralipidTM. We have shown for the first time that range imaging cameras can replace the traditional detectors in diffuse optical tomography.

text: Proof of concept of diffuse optical tomography using time-of-flight range imaging cameras Diffuse optical tomography is an optical technique to create 3-dimensional images of the inside of highly scattering material. Research groups around the world have been developing imaging systems using various source-detector arrangements to determine optical properties of biological tissue with a focus on medical applications. In this paper we investigate whether a range imaging camera can be used as a detector array. We used time-of-flight range imaging cameras instead of the conventional source-detector array used by others. The results provided in this paper show reconstructed images of absorption and reduced scattering of an object submerged in a tissue simulating phantom. Using the ranging camera XZ422 Demonstrator and the NIRFAST software package, we reconstructed 2D images of a 6 mm metal rod submerged in the centre of a 5 cm deep tank filled with 1% IntralipidTM. We have shown for the first time that range imaging cameras can replace the traditional detectors in diffuse optical tomography.

year: 2010

title: Fragmentation pathways of [Re₂(μ-OR)₃(CO)₆]– (R = H, Me) and ligand exchange reactions with oxygen donor ligands, investigated by electrospray mass spectrometry

authors: Jiang, Chenghua

subjects: chemistry

abstract: The rhenium hydroxy and methoxy carbonyl complexes [Re₂(μOR)₃(CO)₆]⁻ (R = H or Me) have been studied by negative-ion electrospray mass spectrometry (ESMS). The complexes undergo facile exchange reactions with protic compounds, including alcohols and phenols. With dimethyl malonate, ester hydrolysis occurs giving carboxylate-containing complexes, and with H₂O₂ or ButOOH, oxidation to ReO₄⁻occurs. The feasibility and extent of these reactions can conveniently, rapidly, and unambiguously be determined by electrospray mass spectrometry, and is dependent on the acidity and steric bulk of the protic compound. The results also suggest that the complexes can be used as versatile starting materials for the synthesis of a wide range of analogous [Re₂(μ-OR)₃(CO)₆]⁻ complexes by simple reaction with an excess of the appropriate alcohol. By varying the applied cone voltage the fragmentation pathways have been investigated; the hydroxy complex undergoes dehydration followed by CO loss, whereas for the methoxy complex  -hydride elimination (and CO loss) is observed, with confirmation provided by deuterium labelling studies. Under ESMS conditions, the neutral complexes [Re₂(μ-OR)₂(μ-dppf )(CO)₆] [R = H or Me; dppf = 1,1 -bis(diphenylphosphino)ferrocene] undergo substantial solvolysis and hydrolysis to give mainly mononuclear species; simple parent ions (e.g. [M + H]⁺) are not formed in appreciable abundance, probably due to the lack of an efficient ionisation pathway.

text: Fragmentation pathways of [Re₂(μ-OR)₃(CO)₆]– (R = H, Me) and ligand exchange reactions with oxygen donor ligands, investigated by electrospray mass spectrometry The rhenium hydroxy and methoxy carbonyl complexes [Re₂(μOR)₃(CO)₆]⁻ (R = H or Me) have been studied by negative-ion electrospray mass spectrometry (ESMS). The complexes undergo facile exchange reactions with protic compounds, including alcohols and phenols. With dimethyl malonate, ester hydrolysis occurs giving carboxylate-containing complexes, and with H₂O₂ or ButOOH, oxidation to ReO₄⁻occurs. The feasibility and extent of these reactions can conveniently, rapidly, and unambiguously be determined by electrospray mass spectrometry, and is dependent on the acidity and steric bulk of the protic compound. The results also suggest that the complexes can be used as versatile starting materials for the synthesis of a wide range of analogous [Re₂(μ-OR)₃(CO)₆]⁻ complexes by simple reaction with an excess of the appropriate alcohol. By varying the applied cone voltage the fragmentation pathways have been investigated; the hydroxy complex undergoes dehydration followed by CO loss, whereas for the methoxy complex  -hydride elimination (and CO loss) is observed, with confirmation provided by deuterium labelling studies. Under ESMS conditions, the neutral complexes [Re₂(μ-OR)₂(μ-dppf )(CO)₆] [R = H or Me; dppf = 1,1 -bis(diphenylphosphino)ferrocene] undergo substantial solvolysis and hydrolysis to give mainly mononuclear species; simple parent ions (e.g. [M + H]⁺) are not formed in appreciable abundance, probably due to the lack of an efficient ionisation pathway.

year: 2000

title: Ko Waipā te awa

authors: Kukutai, Josephine

abstract: This thesis examines the experience of the Ngāti Maniapoto (‘Maniapoto’) iwi in the development and implementation of their river settlement legislation, the Ngā Wai o Maniapoto (Waipā River) Act 2012 (the 'Act’) . The overarching purpose of the Act is to restore and maintain the quality and integrity of the waters that flow into and form part of the Waipā River for present and future generations and the care and protection of the mana tuku iho o Waiwaia. The restoration of the Waipā River is essential because of its considerable significance to Maniapoto. The Waipā River is connected to the health and identity of the Maniapoto people and is a taonga (gift) that contains their spiritual and physical wellbeing. The Waipā River is significant because: 
Te Awa o Waipā is a taonga to Maniapoto; the relationship between Maniapoto and the Waipā River is historical, intellectual, physical, and spiritual; to Maniapoto, their relationship with the Waipā River and their respect for it lies at the heart of their spiritual and physical wellbeing, and their tribal identity and culture
The approach to expressing the journey of Maniapoto in the development and implementation of the Waipā River legislation required a Māori lens. I used a Kaupapa Māori approach to examine the development of the Act and again to understand the difficulties in realising the promise of the Act. The focus of this thesis is on the Maniapoto people and their experience of the Act. The Waipā River Settlement and the Waikato River Settlement are closely connected, and the study delves into the history of the Waikato River Settlement and its influence on the Waipā River Settlement. The rangatiratanga (authority) of Maniapoto within their rohe has always been paramount in decision-making. The co-governance and co-management framework however relies on a different form of decision, that of co-decision-making, which is conducted not only in partnership with the Crown but also other Waikato River iwi. Co-governance and co-management change the standard model of traditional autonomous decision-making or rangatiratanga within an iwi and potentially challenges the decisions made. The co-governance and co-management Deed agreed between Maniapoto and the Crown for the Waipā River has changed how people operate in the Maniapoto rohe and how they may have operated previously. This thesis concludes by reflecting on some of the challenges experienced by Maniapoto in the new co-governance and co-management era.

text: Ko Waipā te awa This thesis examines the experience of the Ngāti Maniapoto (‘Maniapoto’) iwi in the development and implementation of their river settlement legislation, the Ngā Wai o Maniapoto (Waipā River) Act 2012 (the 'Act’) . The overarching purpose of the Act is to restore and maintain the quality and integrity of the waters that flow into and form part of the Waipā River for present and future generations and the care and protection of the mana tuku iho o Waiwaia. The restoration of the Waipā River is essential because of its considerable significance to Maniapoto. The Waipā River is connected to the health and identity of the Maniapoto people and is a taonga (gift) that contains their spiritual and physical wellbeing. The Waipā River is significant because: 
Te Awa o Waipā is a taonga to Maniapoto; the relationship between Maniapoto and the Waipā River is historical, intellectual, physical, and spiritual; to Maniapoto, their relationship with the Waipā River and their respect for it lies at the heart of their spiritual and physical wellbeing, and their tribal identity and culture
The approach to expressing the journey of Maniapoto in the development and implementation of the Waipā River legislation required a Māori lens. I used a Kaupapa Māori approach to examine the development of the Act and again to understand the difficulties in realising the promise of the Act. The focus of this thesis is on the Maniapoto people and their experience of the Act. The Waipā River Settlement and the Waikato River Settlement are closely connected, and the study delves into the history of the Waikato River Settlement and its influence on the Waipā River Settlement. The rangatiratanga (authority) of Maniapoto within their rohe has always been paramount in decision-making. The co-governance and co-management framework however relies on a different form of decision, that of co-decision-making, which is conducted not only in partnership with the Crown but also other Waikato River iwi. Co-governance and co-management change the standard model of traditional autonomous decision-making or rangatiratanga within an iwi and potentially challenges the decisions made. The co-governance and co-management Deed agreed between Maniapoto and the Crown for the Waipā River has changed how people operate in the Maniapoto rohe and how they may have operated previously. This thesis concludes by reflecting on some of the challenges experienced by Maniapoto in the new co-governance and co-management era.

year: 2020