title: Proton acceleration in analytic reconnecting current sheets

authors: Heerikhuisen, Jacob

subjects: acceleration of particles—MHD—Sun

abstract: Particle acceleration provides an important signature for the magnetic collapse that accompanies a solar flare. Most particle acceleration studies, however, invoke magnetic and electric field models that are analytically convenient rather than solutions of the governing magnetohydrodynamic equations. In this paper a self-consistent magnetic reconnection solution is employed to investigate proton orbits, energy gains, and acceleration timescales for proton acceleration in solar flares. The magnetic field configuration is derived from the analytic reconnection solution of Craig and Henton. For the physically realistic case in which magnetic pressure of the current sheet is limited at small resistivities, the model contains a single free parameter that specifies the shear of the velocity field. It is shown that in the absence of losses, the field produces particle acceleration spectra characteristic of magnetic X-points. Specifically, the energy distribution approximates a power law ~ξ-3/2  nonrelativistically, but steepens slightly at the higher energies. Using realistic values of the “effective” resistivity, we obtain energies and acceleration times that fall within the range of observational data for proton acceleration in the solar corona.

text: Proton acceleration in analytic reconnecting current sheets Particle acceleration provides an important signature for the magnetic collapse that accompanies a solar flare. Most particle acceleration studies, however, invoke magnetic and electric field models that are analytically convenient rather than solutions of the governing magnetohydrodynamic equations. In this paper a self-consistent magnetic reconnection solution is employed to investigate proton orbits, energy gains, and acceleration timescales for proton acceleration in solar flares. The magnetic field configuration is derived from the analytic reconnection solution of Craig and Henton. For the physically realistic case in which magnetic pressure of the current sheet is limited at small resistivities, the model contains a single free parameter that specifies the shear of the velocity field. It is shown that in the absence of losses, the field produces particle acceleration spectra characteristic of magnetic X-points. Specifically, the energy distribution approximates a power law ~ξ-3/2  nonrelativistically, but steepens slightly at the higher energies. Using realistic values of the “effective” resistivity, we obtain energies and acceleration times that fall within the range of observational data for proton acceleration in the solar corona.

year: 2002-02

title: An open-source toolkit for mining Wikipedia

authors: Milne, David N.

subjects: Annotation

abstract: The online encyclopedia Wikipedia is a vast, constantly evolving tapestry of interlinked articles. For developers and researchers it represents a giant multilingual database of concepts and semantic relations, a potential resource for natural language processing and many other research areas. This paper introduces the Wikipedia Miner toolkit, an open-source software system that allows researchers and developers to integrate Wikipedia's rich semantics into their own applications. The toolkit creates databases that contain summarized versions of Wikipedia's content and structure, and includes a Java API to provide access to them. Wikipedia's articles, categories and redirects are represented as classes, and can be efficiently searched, browsed, and iterated over. Advanced features include parallelized processing of Wikipedia dumps, machine-learned semantic relatedness measures and annotation features, and XML-based web services. Wikipedia Miner is intended to be a platform for sharing data mining techniques. Annotation; Disambiguation; Ontology extraction; Semantic relatedness; Toolkit; Wikipedia

text: An open-source toolkit for mining Wikipedia The online encyclopedia Wikipedia is a vast, constantly evolving tapestry of interlinked articles. For developers and researchers it represents a giant multilingual database of concepts and semantic relations, a potential resource for natural language processing and many other research areas. This paper introduces the Wikipedia Miner toolkit, an open-source software system that allows researchers and developers to integrate Wikipedia's rich semantics into their own applications. The toolkit creates databases that contain summarized versions of Wikipedia's content and structure, and includes a Java API to provide access to them. Wikipedia's articles, categories and redirects are represented as classes, and can be efficiently searched, browsed, and iterated over. Advanced features include parallelized processing of Wikipedia dumps, machine-learned semantic relatedness measures and annotation features, and XML-based web services. Wikipedia Miner is intended to be a platform for sharing data mining techniques. Annotation; Disambiguation; Ontology extraction; Semantic relatedness; Toolkit; Wikipedia

year: 2013

title: Investment in Authentic Sustainable Cultural Tourism : Planning for the Future Benefit of Waikato-Tainui along the Waikato River, Case Studies at Tūrangawaewae and Te Awamārahi Marae

authors: Cooper, Mei Te Werawera Te Reokaha

abstract: “Tērā ōkū hoa kei ngā tōpito e whā o te ao - My friends will come from all parts of the world” – Kīngi Tāwhiao 1822-1894

This doctorate is guided by the visions of the second Māori king, Kīngi Tāwhiao, which reflect the importance of global connections, relationships (Turongo House, 2000:109) and investment to achieve the ultimate goal of authentic or ‘true’ sustainability throughout the world.  The strategic process will require a balance between humans and the natural environment to ensure long-term growth and survival.  This research will investigate whether investment in Authentic Sustainable Cultural Tourism (ASCT) will provide long-term and sustainable benefits for tribes throughout New Zealand, using a study of Waikato-Tainui.  ASCT, if practiced correctly, must be driven by whānau of marae, hapū and iwi alongside ideal long-term partners to ultimately achieve indigenous autonomy. ASCT prioritises the wellbeing of indigenous and local communities, cultural preservation and environmental sustainability while providing secure economic returns to key stakeholders. 

Today, tourism is New Zealand’s largest and fastest growing industry; total tourism expenditure is forecast to increase from $34.7b in 2016, an increase of 12.2% from the previous year, to $41b by 2025.  The natural landscape is the main reason why international travellers visit New Zealand, followed by an interest in Māori culture (Tourism Industry Association, 2015).  Unfortunately, there is sparse funding for Māori tourism development (New Zealand Māori Tourism, 2015; Goulter, 2015) compared to mainstream tourism and Māori are the most impoverished people in New Zealand (Statistics New Zealand, 2011).  Cultural tourism has existed in New Zealand for more than 150 years and has a vital role in New Zealand’s tourism industry.  Te Kīngitanga and the Waikato River are the main aspects that make Waikato unique in New Zealand, however, there is very little cultural tourism in the region.  As a descendant of Waikato-Tainui, I work with my people at the marae level to inform tribal governance about the significant opportunities available to whānau compared to current mainstream investments by the tribe. 

Using Kaupapa Māori and critical realism, the methods used in this research include an investigation of government tourism organisations, interviews with Waikato-Tainui governance groups, case studies at Tūrangawaewae and Te Awamārahi Marae, case studies at fourteen successful Māori tourism providers throughout New Zealand, and an international comparison of best practices in indigenous tourism.

text: Investment in Authentic Sustainable Cultural Tourism : Planning for the Future Benefit of Waikato-Tainui along the Waikato River, Case Studies at Tūrangawaewae and Te Awamārahi Marae “Tērā ōkū hoa kei ngā tōpito e whā o te ao - My friends will come from all parts of the world” – Kīngi Tāwhiao 1822-1894

This doctorate is guided by the visions of the second Māori king, Kīngi Tāwhiao, which reflect the importance of global connections, relationships (Turongo House, 2000:109) and investment to achieve the ultimate goal of authentic or ‘true’ sustainability throughout the world.  The strategic process will require a balance between humans and the natural environment to ensure long-term growth and survival.  This research will investigate whether investment in Authentic Sustainable Cultural Tourism (ASCT) will provide long-term and sustainable benefits for tribes throughout New Zealand, using a study of Waikato-Tainui.  ASCT, if practiced correctly, must be driven by whānau of marae, hapū and iwi alongside ideal long-term partners to ultimately achieve indigenous autonomy. ASCT prioritises the wellbeing of indigenous and local communities, cultural preservation and environmental sustainability while providing secure economic returns to key stakeholders. 

Today, tourism is New Zealand’s largest and fastest growing industry; total tourism expenditure is forecast to increase from $34.7b in 2016, an increase of 12.2% from the previous year, to $41b by 2025.  The natural landscape is the main reason why international travellers visit New Zealand, followed by an interest in Māori culture (Tourism Industry Association, 2015).  Unfortunately, there is sparse funding for Māori tourism development (New Zealand Māori Tourism, 2015; Goulter, 2015) compared to mainstream tourism and Māori are the most impoverished people in New Zealand (Statistics New Zealand, 2011).  Cultural tourism has existed in New Zealand for more than 150 years and has a vital role in New Zealand’s tourism industry.  Te Kīngitanga and the Waikato River are the main aspects that make Waikato unique in New Zealand, however, there is very little cultural tourism in the region.  As a descendant of Waikato-Tainui, I work with my people at the marae level to inform tribal governance about the significant opportunities available to whānau compared to current mainstream investments by the tribe. 

Using Kaupapa Māori and critical realism, the methods used in this research include an investigation of government tourism organisations, interviews with Waikato-Tainui governance groups, case studies at Tūrangawaewae and Te Awamārahi Marae, case studies at fourteen successful Māori tourism providers throughout New Zealand, and an international comparison of best practices in indigenous tourism.

year: 2018