title: Induction of model trees for predicting continuous classes

authors: Wang, Yong

subjects: computer science

abstract: Many problems encountered when applying machine learning in practice involve predicting a "class" that takes on a continuous numeric value, yet few machine learning schemes are able to do this. This paper describes a "rational reconstruction" of M5, a method developed by Quinlan (1992) for inducing trees of regression models. In order to accommodate data typically encountered in practice it is necessary to deal effectively with enumerated attributes and with missing values, and techniques devised by Breiman et al. (1984) are adapted for this purpose. The resulting system seems to outperform M5, based on the scanty published data that is available.

text: Induction of model trees for predicting continuous classes Many problems encountered when applying machine learning in practice involve predicting a "class" that takes on a continuous numeric value, yet few machine learning schemes are able to do this. This paper describes a "rational reconstruction" of M5, a method developed by Quinlan (1992) for inducing trees of regression models. In order to accommodate data typically encountered in practice it is necessary to deal effectively with enumerated attributes and with missing values, and techniques devised by Breiman et al. (1984) are adapted for this purpose. The resulting system seems to outperform M5, based on the scanty published data that is available.

year: 1996-10

title: Factors controlling the tensile properties of ultrafine structured Cu–5vol%Al₂O₃ nanocomposite prepared by high energy mechanical milling and powder compact extrusion

authors: Zhou, Dengshan

subjects: high energy mechanical milling

abstract: The microstructures and tensile properties of two ultrafine structured Cu–5vol%Al₂O₃ nanocomposite samples made by a combination of high energy mechanical milling of a mixture of Cu powder and gamma Al₂O₃ nanopowder and powder compact extrusion were studied. The sample extruded at 750 °C exhibited a microstructure consisting of Cu grains with sizes in the range of 100–500 nm and a dispersion of Al₂O₃ nanoparticles with sizes in the range of 20–345 nm. With the extrusion temperature increasing to 900 °C, the Cu grain sizes remained almost unchanged, but a large fraction of the Al₂O₃ nanoparticles were dissolved, leading to possible formation of nanometer sized Al³⁺/O²⁻ clusters. This microstructural difference of the two samples causes an interesting difference in tensile properties, with the sample extruded at 900 °C showing approximately 150 MPa higher yield strength and ultimate tensile strength and also better ductility than the sample extruded at 750 °C. It appears that this significant beneficial effect of dissolution of Al₂O₃ nanoparticles is mainly caused by the significant strengthening effect of the nanometer sized Al³⁺/O²⁻ clusters through Orowan mechanism.

text: Factors controlling the tensile properties of ultrafine structured Cu–5vol%Al₂O₃ nanocomposite prepared by high energy mechanical milling and powder compact extrusion The microstructures and tensile properties of two ultrafine structured Cu–5vol%Al₂O₃ nanocomposite samples made by a combination of high energy mechanical milling of a mixture of Cu powder and gamma Al₂O₃ nanopowder and powder compact extrusion were studied. The sample extruded at 750 °C exhibited a microstructure consisting of Cu grains with sizes in the range of 100–500 nm and a dispersion of Al₂O₃ nanoparticles with sizes in the range of 20–345 nm. With the extrusion temperature increasing to 900 °C, the Cu grain sizes remained almost unchanged, but a large fraction of the Al₂O₃ nanoparticles were dissolved, leading to possible formation of nanometer sized Al³⁺/O²⁻ clusters. This microstructural difference of the two samples causes an interesting difference in tensile properties, with the sample extruded at 900 °C showing approximately 150 MPa higher yield strength and ultimate tensile strength and also better ductility than the sample extruded at 750 °C. It appears that this significant beneficial effect of dissolution of Al₂O₃ nanoparticles is mainly caused by the significant strengthening effect of the nanometer sized Al³⁺/O²⁻ clusters through Orowan mechanism.

year: 2013

title: Maori perspectives of the environment: A review of Environment Waikato iwi environmental management plans.

authors: Whangapirita, Laura

subjects: Maori

abstract: The purpose of this report is to gather, summarise, analyse and distribute information held by Environment Waikato on Maori and the environment. To achieve this we evaluated and summarised the Ngaati Te Ata Iwi Policy Statement, Iwi Environmental management Plans and iwi contributions made toward the Proposed Waikato Regional Plan (1998) using a Maori values framework. This report has been prepared to contribute towards developing a resource for Environment Waikato’s Strategic Plan Review Teams. The report itself refers to values and beliefs sourced from iwi documents held by Environment waiakto and are presented using a Maori values framework providing the reader with an introduction to the environmental perspectives of tangat whenua in  the Waikato region.

text: Maori perspectives of the environment: A review of Environment Waikato iwi environmental management plans. The purpose of this report is to gather, summarise, analyse and distribute information held by Environment Waikato on Maori and the environment. To achieve this we evaluated and summarised the Ngaati Te Ata Iwi Policy Statement, Iwi Environmental management Plans and iwi contributions made toward the Proposed Waikato Regional Plan (1998) using a Maori values framework. This report has been prepared to contribute towards developing a resource for Environment Waikato’s Strategic Plan Review Teams. The report itself refers to values and beliefs sourced from iwi documents held by Environment waiakto and are presented using a Maori values framework providing the reader with an introduction to the environmental perspectives of tangat whenua in  the Waikato region.

year: 2003-09