title: Anisotropic three-dimensional MHD turbulence

authors: Matthaeus, William H.

subjects: MHD

abstract: Direct spectral method simulation of the three-dimensional magnetohydrodynamics (MHD) equations is used to explore anisotropy that develops from initially isotropic fluctuations as a consequence of a uniform applied magnetic field. Spectral and variance anisotropies are investigated in both compressible and incompressible MHD. The nature of the spectral anisotropy is consistent with the model of Shebalin et al. [1983] in which the spectrum broadens in the perpendicular wavenumber direction, the anisotropy being greater for smaller wavenumbers. Here this effect is seen for both incompressible and polytropic compressible MHD. In contrast, the longitudinal (compressive) velocity fluctuations remain isotropic. Variance anisotropy is observed for low plasma beta compressible MHD but not for incompressible MHD. Solar wind observations are qualitatively consistent with both variance and spectral anisotropies of the type discussed here.

text: Anisotropic three-dimensional MHD turbulence Direct spectral method simulation of the three-dimensional magnetohydrodynamics (MHD) equations is used to explore anisotropy that develops from initially isotropic fluctuations as a consequence of a uniform applied magnetic field. Spectral and variance anisotropies are investigated in both compressible and incompressible MHD. The nature of the spectral anisotropy is consistent with the model of Shebalin et al. [1983] in which the spectrum broadens in the perpendicular wavenumber direction, the anisotropy being greater for smaller wavenumbers. Here this effect is seen for both incompressible and polytropic compressible MHD. In contrast, the longitudinal (compressive) velocity fluctuations remain isotropic. Variance anisotropy is observed for low plasma beta compressible MHD but not for incompressible MHD. Solar wind observations are qualitatively consistent with both variance and spectral anisotropies of the type discussed here.

year: 1996

title: Assembling and enriching digital library collections

authors: Bainbridge, David

subjects: computer science

abstract: People who create digital libraries need to gather together the raw material, add metadata as necessary, and design and build new collections. This paper sets out the requirements for these tasks and describes a new tool that supports them interactively, making it easy for users to create their own collections from electronic files of all types. The process involves selecting documents for inclusion, coming up with a suitable metadata set, assigning metadata to each document or group of documents, designing the form of the collection in terms of document formats, searchable indexes, and browsing facilities, building the necessary indexes and data structures, and putting the collection in place for others to use. Moreover, different situations require different workflows, and the system must be flexible enough to cope with these demands. Although the tool is specific to the Greenstone digital library software, the underlying ideas should prove useful in more general contexts.

text: Assembling and enriching digital library collections People who create digital libraries need to gather together the raw material, add metadata as necessary, and design and build new collections. This paper sets out the requirements for these tasks and describes a new tool that supports them interactively, making it easy for users to create their own collections from electronic files of all types. The process involves selecting documents for inclusion, coming up with a suitable metadata set, assigning metadata to each document or group of documents, designing the form of the collection in terms of document formats, searchable indexes, and browsing facilities, building the necessary indexes and data structures, and putting the collection in place for others to use. Moreover, different situations require different workflows, and the system must be flexible enough to cope with these demands. Although the tool is specific to the Greenstone digital library software, the underlying ideas should prove useful in more general contexts.

year: 2003

title: What land is included?

authors: Oppatt, Neil

abstract: Neil has served the Rotorua District as both a Rotorua District Councillor for 15 years and now 9 years as a BOP Regional Councillor. Throughout this time Neil has been actively involved in the cleanup of Rotorua's lakes. He is presently a BOPRC appointee on the Rotorua Te Arawa Lakes Strategy Group and was an RDC appointee on its predecessor.
He has held positions as Chairman of RDC’s Finance Committee, BOPRC’s Operations and Regulations Committee and the Special Projects Committee set up to address Rotorua lake issues. Neil chaired the Lake Okareka Action Plan Committee and was a BOPRC appointee on the Lake Tarawera Action Plan Committee. Presently he is the BOPRC appointee on the Rotorua catchment Stakeholders Advisory Group.

text: What land is included? Neil has served the Rotorua District as both a Rotorua District Councillor for 15 years and now 9 years as a BOP Regional Councillor. Throughout this time Neil has been actively involved in the cleanup of Rotorua's lakes. He is presently a BOPRC appointee on the Rotorua Te Arawa Lakes Strategy Group and was an RDC appointee on its predecessor.
He has held positions as Chairman of RDC’s Finance Committee, BOPRC’s Operations and Regulations Committee and the Special Projects Committee set up to address Rotorua lake issues. Neil chaired the Lake Okareka Action Plan Committee and was a BOPRC appointee on the Lake Tarawera Action Plan Committee. Presently he is the BOPRC appointee on the Rotorua catchment Stakeholders Advisory Group.

year: 2013