title: The third-order law for increments in magnetohydrodynamic turbulence with constant shear

authors: Wan, Minping

subjects: magnetohydrodynamic turbulence

abstract: We extend the theory for third-order structure functions in homogeneous incompressible
magnetohydrodynamic turbulence to the case in which a constant velocity shear is present. A generalization is found of the usual relation Politano and Pouquet, Phys. Rev. E 57, 21  1998  between third-order structure functions and the dissipation rate in steady inertial range turbulence, in which the shear plays a crucial role. In particular, the presence of shear leads to a third-order law which is notsimply proportional to the relative separation. Possible implications for laboratory and space plasmas are discussed.

text: The third-order law for increments in magnetohydrodynamic turbulence with constant shear We extend the theory for third-order structure functions in homogeneous incompressible
magnetohydrodynamic turbulence to the case in which a constant velocity shear is present. A generalization is found of the usual relation Politano and Pouquet, Phys. Rev. E 57, 21  1998  between third-order structure functions and the dissipation rate in steady inertial range turbulence, in which the shear plays a crucial role. In particular, the presence of shear leads to a third-order law which is notsimply proportional to the relative separation. Possible implications for laboratory and space plasmas are discussed.

year: 2009

title: Mining Domain-Specific Thesauri from Wikipedia: A case study

authors: Milne, David N.

subjects: computer science

abstract: Domain-specific thesauri are high-cost, high-maintenance, high-value knowledge structures. We show how the classic thesaurus structure of terms and links can be mined automatically from Wikipedia. In a comparison with a professional thesaurus for agriculture we find that Wikipedia contains a substantial proportion of its concepts and semantic relations; furthermore it has impressive coverage of contemporary documents in the domain. Thesauri derived using our techniques capitalize on existing public efforts and tend to reflect contemporary language usage better than their costly, painstakingly-constructed manual counterparts.

text: Mining Domain-Specific Thesauri from Wikipedia: A case study Domain-specific thesauri are high-cost, high-maintenance, high-value knowledge structures. We show how the classic thesaurus structure of terms and links can be mined automatically from Wikipedia. In a comparison with a professional thesaurus for agriculture we find that Wikipedia contains a substantial proportion of its concepts and semantic relations; furthermore it has impressive coverage of contemporary documents in the domain. Thesauri derived using our techniques capitalize on existing public efforts and tend to reflect contemporary language usage better than their costly, painstakingly-constructed manual counterparts.

year: 2006

title: Whanaungatanga: an illustration of the importance of cultural context

authors: McNatty, William

subjects: Te reo Māori

abstract: The word 'whanaungatanga' is often used by people who lack an intimate understanding of the philosophical base in Māori culture out of which it emerges. Thus, it is sometimes used simply to describe the camaraderie that can be associated with team sports or with reference to the 'glue' that connects people to one another socially. This is not necessarily a problem in itself. After all, change and development in the lexicon is a characteristic of living languages. However, real problems can emerge where words become divorced from their cultural roots to such an extent that two speakers using the same word can completely fail to understand one another. It is argued here that this is what can happen when Māori words, such as 'whanaungatanga', are used in the context of modelling in the social sciences, particularly where that modelling is conducted in the context of Western social and cultural values. In particular, the essential spiritual dimension of whanaungatanga may be overlooked or misunderstood.

text: Whanaungatanga: an illustration of the importance of cultural context The word 'whanaungatanga' is often used by people who lack an intimate understanding of the philosophical base in Māori culture out of which it emerges. Thus, it is sometimes used simply to describe the camaraderie that can be associated with team sports or with reference to the 'glue' that connects people to one another socially. This is not necessarily a problem in itself. After all, change and development in the lexicon is a characteristic of living languages. However, real problems can emerge where words become divorced from their cultural roots to such an extent that two speakers using the same word can completely fail to understand one another. It is argued here that this is what can happen when Māori words, such as 'whanaungatanga', are used in the context of modelling in the social sciences, particularly where that modelling is conducted in the context of Western social and cultural values. In particular, the essential spiritual dimension of whanaungatanga may be overlooked or misunderstood.

year: 2002-02