950 resultados para character tracing


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Mode of access: Internet.

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Thesis (Ph.D.)--University of Washington, 2016-06

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Thesis (Master's)--University of Washington, 2016-06

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Chaotically structured diamictite from the inner ring syncline surrounding the central uplift of the Woodleigh impact structure contains shocked metamorphic and impact melt-rock fragments, largely derived from Ordovician and Devonian target sandstones. Coarse illite fractions (< 2 mu m) from the sandstones containing no K-feldspar yield K-Ar ages of around 400 Ma, whereas the K-Ar ages of authigenic clays of > 0.2 mu m fractions from the diamictite without smectite and K-feldspar cluster around 360 Ma, consistent with Rb-Sr data. Crystallisation of newly formed illite in the impact melt rock clasts and recrystallisation of earlier formed illite in the sandstone clasts preserved in the diamictite, are attributed to impact-induced hydrothermal processes in the Late Devonian. The illitic clays from the diamictite and from the sandstones have very similar trace element compositions, with significantly enriched incompatible lithophile elements, which increase in concentrations correlatively with those of the compatible ferromagnesian elements. The unusual trace element associations in the clays may be due to the involvement of hot gravity-driven basinal fluids that interacted with rocks of the Precambrian craton to the east of the study area, or with such material transported and reworked in the studied sedimentary succession.

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This paper reports a qualitative study of the practice of leadership in Catholic schools to ascertain the perceptions of lay principals, who as positional leaders play a critical role in embracing and creatively rebuilding the Catholic vision of life within the reality that the Catholic school principalship is now a ministry of the laity. The methodology included semi-structured interviews, field notes, reflexive journals, direct observation, and document nalysis. The study examined both individual human behaviour and the structure of the social order in Catholic schools. The findings point towards successful leadership in Catholic schools being highly influenced by the cultural and spiritual capital that a principal brings to a school signifying a fundamental importance of appointing principals who are not only professionally competent but spiritually as well. In an era of unprecedented social, educational and ecclesial change, and with an ever widening role description, lay principals are challenged to redefine and re-articulate their Catholic character and identity, and will need to look for new ways to make this explicit. Embracing a new leadership paradigm of shared leadership, the preparation and on-going formation of lay principals were identified as critical for the continuance of the Catholic school’s distinctive mission in the future.