title: Synthesis of new heterometallic complexes by tin-sulfur bond cleavage of pySSnPh₃ (pySH = pyridine-2-thiol) at triruthenium and triosmium centres

authors: Raha, Arun K.

subjects: pySSnPh₃

abstract: The ruthenium-tin complex, [Ru₂(CO)₄(SnPh₃)₂(μ-pyS)₂] (1), the main product of the oxidative-addition of pySSnPh₃ to Ru₃(CO)₁₂ in refluxing benzene, is [Ru(CO)₂(pyS)(SnPh₃)] synthon. It reacts with PPh₃ to give [Ru(CO)₂(SnPh₃)(PPh₃)(μ-pyS)] (2) and further with Ru₃(CO)₁₂ or [Os₃(CO)₁₀(NCMe)₂] to afford the butterfly clusters [MOs₃(CO)₁₂ (SnPh₃)(μ₃-pyS)] (3-4). Direct addition of pySSnPh₃ to [Os₃(CO)₁₀(NCMe)₂] at 70°C gives [Os₃(CO)₉(SnPh₃)(μ₃-pyS)] (5) as the only bimetallic compound, while with unsaturated [Os₃(CO)₈{μ₃-PPh₂CH₂P(Ph)C₆H₄}(μ-H)] the previously reported [Os₃(CO)₈(μ-pyS)(μ-H)(μ-dppm)] (6) and the new bimetallic cluster [Os₃(CO)₇(SnPh₃){μ-Ph₂PCH₂P(Ph)C₆H₄}(μ-pyS)[(μ-H)] (7) are formed at 110°C. Compounds 1, 2, 4, 5 and 7 have been characterized by X-ray diffraction studies.

text: Synthesis of new heterometallic complexes by tin-sulfur bond cleavage of pySSnPh₃ (pySH = pyridine-2-thiol) at triruthenium and triosmium centres The ruthenium-tin complex, [Ru₂(CO)₄(SnPh₃)₂(μ-pyS)₂] (1), the main product of the oxidative-addition of pySSnPh₃ to Ru₃(CO)₁₂ in refluxing benzene, is [Ru(CO)₂(pyS)(SnPh₃)] synthon. It reacts with PPh₃ to give [Ru(CO)₂(SnPh₃)(PPh₃)(μ-pyS)] (2) and further with Ru₃(CO)₁₂ or [Os₃(CO)₁₀(NCMe)₂] to afford the butterfly clusters [MOs₃(CO)₁₂ (SnPh₃)(μ₃-pyS)] (3-4). Direct addition of pySSnPh₃ to [Os₃(CO)₁₀(NCMe)₂] at 70°C gives [Os₃(CO)₉(SnPh₃)(μ₃-pyS)] (5) as the only bimetallic compound, while with unsaturated [Os₃(CO)₈{μ₃-PPh₂CH₂P(Ph)C₆H₄}(μ-H)] the previously reported [Os₃(CO)₈(μ-pyS)(μ-H)(μ-dppm)] (6) and the new bimetallic cluster [Os₃(CO)₇(SnPh₃){μ-Ph₂PCH₂P(Ph)C₆H₄}(μ-pyS)[(μ-H)] (7) are formed at 110°C. Compounds 1, 2, 4, 5 and 7 have been characterized by X-ray diffraction studies.

year: 2010

title: Estimating heading direction from monocular video sequences using biologically-based sensor

authors: Cree, Michael J.

subjects: Cameras

abstract: The determination of one’s movement through the environment (visual odometry or self-motion estimation) from monocular sources such as video is an important research problem because of its relevance to robotics and autonomous vehicles. The traditional computer vision approach to this problem tracks visual features across frames in order to obtain 2-D image motion estimates from which the camera motion can be derived. We present an alternative scheme which uses the properties of motion sensitive cells in the primate brain to derive the image motion and the camera heading vector. We tested heading estimation using a camera mounted on a linear translation table with the line of sight of the camera set at a range of angles relative to straight ahead (0◦ to 50◦ in 10◦ steps). The camera velocity was also varied (0.2, 0.4, 0.8, 1.2, 1.6 and 2.0 m/s). Our biologically-based method produced accurate heading estimates over a wide range of test angles and camera speeds. Our approach has the advantage of being a one-shot estimator and not requiring iterative search techniques for finding the heading.

text: Estimating heading direction from monocular video sequences using biologically-based sensor The determination of one’s movement through the environment (visual odometry or self-motion estimation) from monocular sources such as video is an important research problem because of its relevance to robotics and autonomous vehicles. The traditional computer vision approach to this problem tracks visual features across frames in order to obtain 2-D image motion estimates from which the camera motion can be derived. We present an alternative scheme which uses the properties of motion sensitive cells in the primate brain to derive the image motion and the camera heading vector. We tested heading estimation using a camera mounted on a linear translation table with the line of sight of the camera set at a range of angles relative to straight ahead (0◦ to 50◦ in 10◦ steps). The camera velocity was also varied (0.2, 0.4, 0.8, 1.2, 1.6 and 2.0 m/s). Our biologically-based method produced accurate heading estimates over a wide range of test angles and camera speeds. Our approach has the advantage of being a one-shot estimator and not requiring iterative search techniques for finding the heading.

year: 2016

title: Building capacity for sustainable Iwi development

authors: Bishop, Russell

subjects: Māori community development

abstract: Since 1998, four iwi groups have participated in a Māori Sustainable Development project with researchers from the University of Waikato. This project has sought to develop a better understanding of iwi aspirations for economic, social and cultural development. Based on this research, the project seeks to identify, in conjunction with iwi, capacity building models and options in order to provide sustainable economic, social and cultural development. One finding of the research, based on the responses from iwi who have participated in this project, identifies iwi values and identity as the basis for a capacity building model for Māori sustainable development. It is this that is the focus of this paper.

text: Building capacity for sustainable Iwi development Since 1998, four iwi groups have participated in a Māori Sustainable Development project with researchers from the University of Waikato. This project has sought to develop a better understanding of iwi aspirations for economic, social and cultural development. Based on this research, the project seeks to identify, in conjunction with iwi, capacity building models and options in order to provide sustainable economic, social and cultural development. One finding of the research, based on the responses from iwi who have participated in this project, identifies iwi values and identity as the basis for a capacity building model for Māori sustainable development. It is this that is the focus of this paper.

year: 2002-09