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The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
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Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
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Showing 151 to 160 of 160 (0.039 seconds)| 151 |
The Mineralogical Composition of House Dust in Ontario, CanadaWoldemichael, Michael Haile 01 February 2012 (has links)
Despite increasing concern about the presence of heavy metals, pesticides and other toxins in indoor environments, very little is known about the physical and chemical composition of ordinary household dust. This study represents the first systematic investigation of the mineralogical composition of indoor dust in residential housing in Canada.
Specimens of dust were obtained from homes in six geographically separate cities in the Province of Ontario: two located on the metamorphic and igneous rocks of the Precambrian Canadian Shield (Thunder Bay and Sudbury), the other four located on Palaeozoic limestone and shale dominated bedrock (Barrie, Burlington, Cambridge, and Hamilton). Forty samples of household vacuum dust were obtained. The coarse fraction (80 – 300 µm) of this dust was subjected to flotation (using water) to separate the organic components (e.g. insect fragments, dander), natural and synthetic materials (e.g. fibres, plastics) from the mineral residue. The mineral fraction was then analyzed using quantitative point counting, polarizing light microscopy, powder X-ray diffraction and scanning electron microscopy methods.
Despite the great distances between the sampling localities and the distinct differences in bedrock geology, the mineral fraction of dust from all six cities is remarkably similar and dominated by quartz and feldspar, followed by lithic fragments, calcite, and amphibole. Some evidence of the influence of local geology can nevertheless be found. For example, a relatively higher proportion of sulphide minerals is observed in the two cities on the Canadian Shield where these minerals are clearly more abundant in the bedrock. Specimens from Sudbury, Canada’s largest mining centre located atop a nickel-sulphide mineral deposit, showed the highest sulphide contents. Quartz is the dominant mineral in all cities. All quartz grains have internal strain features and fluid inclusions that are indicative of a metamorphic-igneous provenance.
In all cities, sand is used on the streets as an abrasive for traction during the icy winter season. This sand is obtained in all cases from local glaciofluvial deposits that were ultimately derived principally from the rocks of the Canadian Shield in the last Pleistocene glaciations that affected all of Ontario. Thus, tracking in sand is the most plausible mechanism by which quartz was introduced into these homes since sampling was done, in all cases, in the winter season.
The results indicate that glacial deposits dominate the mineral composition of indoor dust in Ontario cities and that nature of the bedrock immediately underlying the sampling sites is relatively of minor importance.
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The Mineralogical Composition of House Dust in Ontario, CanadaWoldemichael, Michael Haile 01 February 2012 (has links)
Despite increasing concern about the presence of heavy metals, pesticides and other toxins in indoor environments, very little is known about the physical and chemical composition of ordinary household dust. This study represents the first systematic investigation of the mineralogical composition of indoor dust in residential housing in Canada.
Specimens of dust were obtained from homes in six geographically separate cities in the Province of Ontario: two located on the metamorphic and igneous rocks of the Precambrian Canadian Shield (Thunder Bay and Sudbury), the other four located on Palaeozoic limestone and shale dominated bedrock (Barrie, Burlington, Cambridge, and Hamilton). Forty samples of household vacuum dust were obtained. The coarse fraction (80 – 300 µm) of this dust was subjected to flotation (using water) to separate the organic components (e.g. insect fragments, dander), natural and synthetic materials (e.g. fibres, plastics) from the mineral residue. The mineral fraction was then analyzed using quantitative point counting, polarizing light microscopy, powder X-ray diffraction and scanning electron microscopy methods.
Despite the great distances between the sampling localities and the distinct differences in bedrock geology, the mineral fraction of dust from all six cities is remarkably similar and dominated by quartz and feldspar, followed by lithic fragments, calcite, and amphibole. Some evidence of the influence of local geology can nevertheless be found. For example, a relatively higher proportion of sulphide minerals is observed in the two cities on the Canadian Shield where these minerals are clearly more abundant in the bedrock. Specimens from Sudbury, Canada’s largest mining centre located atop a nickel-sulphide mineral deposit, showed the highest sulphide contents. Quartz is the dominant mineral in all cities. All quartz grains have internal strain features and fluid inclusions that are indicative of a metamorphic-igneous provenance.
In all cities, sand is used on the streets as an abrasive for traction during the icy winter season. This sand is obtained in all cases from local glaciofluvial deposits that were ultimately derived principally from the rocks of the Canadian Shield in the last Pleistocene glaciations that affected all of Ontario. Thus, tracking in sand is the most plausible mechanism by which quartz was introduced into these homes since sampling was done, in all cases, in the winter season.
The results indicate that glacial deposits dominate the mineral composition of indoor dust in Ontario cities and that nature of the bedrock immediately underlying the sampling sites is relatively of minor importance.
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Testování žáků mladšího školního věku z anglického jazyka / Testing Young English Language LearnersURBANOVÁ, Lenka January 2013 (has links)
This diploma thesis deals with the theme of testing young learners in English. The thesis consists of two main parts - theoretical and practical. The theoretical part deals with testing as one form of assessment. Language skills and subskills are studied and Cambridge Young Learners English Tests are described there in detail. This part also tries to find out the answers to essential questions concerning testing. The practical part investigates how the preparation before CYLET tests and their taking influenced the existing level of pupil´s language skills. The second part also asks whether these tests motivate the students for their further development in English. The case study is based on a one-year observation, the results from questionnaires, and an interview with the teacher who prepared pupils for the exam. The thesis is finished by short essay titled: Why are CYLET tests so motivating?
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The Mineralogical Composition of House Dust in Ontario, CanadaWoldemichael, Michael Haile January 2012 (has links)
Despite increasing concern about the presence of heavy metals, pesticides and other toxins in indoor environments, very little is known about the physical and chemical composition of ordinary household dust. This study represents the first systematic investigation of the mineralogical composition of indoor dust in residential housing in Canada.
Specimens of dust were obtained from homes in six geographically separate cities in the Province of Ontario: two located on the metamorphic and igneous rocks of the Precambrian Canadian Shield (Thunder Bay and Sudbury), the other four located on Palaeozoic limestone and shale dominated bedrock (Barrie, Burlington, Cambridge, and Hamilton). Forty samples of household vacuum dust were obtained. The coarse fraction (80 – 300 µm) of this dust was subjected to flotation (using water) to separate the organic components (e.g. insect fragments, dander), natural and synthetic materials (e.g. fibres, plastics) from the mineral residue. The mineral fraction was then analyzed using quantitative point counting, polarizing light microscopy, powder X-ray diffraction and scanning electron microscopy methods.
Despite the great distances between the sampling localities and the distinct differences in bedrock geology, the mineral fraction of dust from all six cities is remarkably similar and dominated by quartz and feldspar, followed by lithic fragments, calcite, and amphibole. Some evidence of the influence of local geology can nevertheless be found. For example, a relatively higher proportion of sulphide minerals is observed in the two cities on the Canadian Shield where these minerals are clearly more abundant in the bedrock. Specimens from Sudbury, Canada’s largest mining centre located atop a nickel-sulphide mineral deposit, showed the highest sulphide contents. Quartz is the dominant mineral in all cities. All quartz grains have internal strain features and fluid inclusions that are indicative of a metamorphic-igneous provenance.
In all cities, sand is used on the streets as an abrasive for traction during the icy winter season. This sand is obtained in all cases from local glaciofluvial deposits that were ultimately derived principally from the rocks of the Canadian Shield in the last Pleistocene glaciations that affected all of Ontario. Thus, tracking in sand is the most plausible mechanism by which quartz was introduced into these homes since sampling was done, in all cases, in the winter season.
The results indicate that glacial deposits dominate the mineral composition of indoor dust in Ontario cities and that nature of the bedrock immediately underlying the sampling sites is relatively of minor importance.
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When data crimes are real crimes: voter surveillance and the Cambridge Analytica conflictGordon, Jesse 28 August 2019 (has links)
This thesis asks what conditions elevated the Cambridge Analytica (CA) conflict
into a sustained and global political issue? Was this a privacy conflict and if so, how was
it framed as such? This work demonstrates that the public outcry to CA formed out of
three underlying structural conditions: The rise of the alt-right as an ideology,
surveillance capitalism, and a growing and unregulated voter analytics industry. A
network of actors seized the momentum of this conflict to drive the message that voter
surveillance is a threat to democratic elections. These actors humanized the CA conflict
and created a catalyst for a large scale public outrage to these previously ignored
structures. Their focus on democratic threat also allowed this conflict to transcend the
typical contours of a privacy conflict and demonstrate that the consequences of CA are
societal, rather than personal. Despite the democratic threat of voter surveillance, Canada
and the United States have yet to address the wider implications of voter surveillance
adequately. Thus, how these systems are used will be a question of central importance in
upcoming elections. / Graduate
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An Analysis of Race and Gender in Select Choice Programs Within Brevard County Public SchoolsDoaks, Synthia 01 January 2014 (has links)
The focus of this research was to compare the student membership population proportions, by race and gender, of Brevard County Public School students with the actual participation in select choice programs offered to Brevard County public high school students. This study was based on an analysis of the scores of 1,152 eighth-grade students who received a score of 4 or 5 on the 2008 Florida Comprehensive Assessment Test (FCAT) mathematics and a score of 4 or 5 on the 2008 Florida Comprehensive Assessment Test (FCAT) reading and their participation in high school advanced academic courses. The advanced academic choice programs selected for this study consisted of the four Florida articulated accelerated college credit seeking programs: Advanced Placement (AP), Dual-Enrollment (DE), International Baccalaureate (IB) Diploma Programme, and the Cambridge Advanced International Certificate of Education (AICE). The proportion comparison consisted of student membership data and eighth-grade FCAT scores from 2007-2008 and the student membership data and high school course load data from the 2008-2009, 2009-2010, 2010-2011, and 2011-2012 academic school years. Chi-square goodness-of-fit tests were run to analyze the proportions by race and gender of the sample groups and student membership populations. For each respective year involved in this study, there was a statistically significant difference in the race and gender proportions of the samples and the student membership populations.
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I classici attraverso l'Atlantico: la ricezione dei Padri Fondatori e Thomas Jefferson / CLASSICS ACROSS THE ATLANTIC: THE FOUNDERS' RECEPTION AND THOMAS JEFFERSONBENEDETTI, MARTA 17 March 2016 (has links)
La tesi si occupa di verificare l’influenza che i classici greci e latini hanno esercitato su i padri fondatori americani e più in particolare su Thomas Jefferson. La prima sezione tratteggia il contesto universitario e lo studio delle lingue classiche tra seicento e settecento, comprendendo non solo le università inglesi (Oxford e Cambridge) e scozzesi, ma anche i nuovi college nati nelle colonie americane. Tale analisi dei modelli e delle pratiche educative ha permesso, in effetti, di comprendere meglio l’influenza dei classici sui rivoluzionari americani. Nello specifico viene scandagliata a fondo l’educazione ricevuta da Jefferson. Tra i numerosi spunti di studio aperti da codesto argomento, il lavoro si concentra sulle modalità con cui i classici gli furono insegnati, sul suo Commonplace Book (una raccolta di brani tratti in parte da autori antichi letti in giovinezza) e su documentazione epistolare. Quest’ultima è oggetto particolare di studio, allo scopo di scoprire quali opere antiche Jefferson, in età adulta e durante la vecchiaia, lesse e apprezzò. Essendo un collezionista di libri, comprò moltissimi testi classici come dimostrano alcuni suoi manoscritti.
Nonostante manchino dati precisi a riguardo, risulta inoltre che Jefferson, benché facesse largo uso di traduzioni, preferiva leggere in originale e che probabilmente abbia letto la maggior parte di questi libri durante il ritiro dalla vita politica.
La seconda parte della tesi si concentra, invece, a indagare quanto la sua educazione classica abbia contributo alla formazione della sua personalità e delle sue idee, nonché alla forma stessa del suo pensiero in merito ad alcune tematiche. Lo studio è di conseguenza dedicato all’esperienza umana di Jefferson, in particolare alla sua riflessione sulla morte e sull’eternità, temi fortemente legati alla sua ricezione di idee epicuree e stoiche. Epicureismo e Stoicismo rappresentano, in definitiva, i due sistemi filosofici antichi che hanno maggiormente influenzato la sua personalità e il suo pensiero. / The aim of the present work is to evaluate the impact of the ancient classics on the American Founding Fathers, with a particular focus on Thomas Jefferson.
The first section gives a wide portrait of the academic context in which the Founders were educated, comprising not only of Oxford, Cambridge, and the Scottish universities, but also the colonial colleges. The evaluation of the educational practices in use at the time makes it possible to understand better the classical impact on revolutionary Americans. In particular, this analysis studies in depth Jefferson's education. Of the many possible perspectives and approaches to this topic, the present work focuses on the way ancient classics were taught to him, his Commonplace Book, which reports part of the ancient classics he read during his youth, and his correspondence. The latter has been studied especially to understand which other ancient writers he read, valued, and esteemed in his adulthood and old age.
As book collector, Jefferson bought an incredible number of ancient classics, as attested by a few manuscripts of his book lists. Despite the dearth of sure evidence, it is very likely that he read the ancient works largely during his retirement. He loved reading them in the original, though he made great use of translations.
The second part of this work is dedicated to investigating how Jefferson's classical education contributed to the building of his personality and ideas, as well as how he elaborated specific classical themes in his own life. The study is thus focused on Jefferson's personal human experience, specifically on his reflection on human mortality and the afterlife. These themes, indeed, are strictly linked to his reception of Epicurean and Stoic tenets, the two ancient philosophical systems which had the greatest and most profound impact on Jefferson's personality and thought.
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Peter Guthrie Tait : new insights into aspects of his life and work : and associated topics in the history of mathematicsLewis, Elizabeth Faith January 2015 (has links)
In this thesis I present new insights into aspects of Peter Guthrie Tait's life and work, derived principally from largely-unexplored primary source material: Tait's scrapbook, the Tait–Maxwell school-book and Tait's pocket notebook. By way of associated historical insights, I also come to discuss the innovative and far-reaching mathematics of the elusive Frenchman, C.-V. Mourey. P. G. Tait (1831–1901) F.R.S.E., Professor of Mathematics at the Queen's College, Belfast (1854–1860) and of Natural Philosophy at the University of Edinburgh (1860–1901), was one of the leading physicists and mathematicians in Europe in the nineteenth century. His expertise encompassed the breadth of physical science and mathematics. However, since the nineteenth century he has been unfortunately overlooked—overshadowed, perhaps, by the brilliance of his personal friends, James Clerk Maxwell (1831–1879), Sir William Rowan Hamilton (1805–1865) and William Thomson (1824–1907), later Lord Kelvin. Here I present the results of extensive research into the Tait family history. I explore the spiritual aspect of Tait's life in connection with The Unseen Universe (1875) which Tait co-authored with Balfour Stewart (1828–1887). I also reveal Tait's surprising involvement in statistics and give an account of his introduction to complex numbers, as a schoolboy at the Edinburgh Academy. A highlight of the thesis is a re-evaluation of C.-V. Mourey's 1828 work, La Vraie Théorie des quantités négatives et des quantités prétendues imaginaires, which I consider from the perspective of algebraic reform. The thesis also contains: (i) a transcription of an unpublished paper by Hamilton on the fundamental theorem of algebra which was inspired by Mourey and (ii) new biographical information on Mourey.
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TU-Spektrum 2/2007, Magazin der Technischen Universität ChemnitzSteinebach, Mario, Thehos, Katharina, Häckel-Riffler, Christine, Brabandt, Antje, Mahler, Janine, Chlebusch, Michael, Doriath, Thomas, Leithold, Nicole, Linne, Carina 14 September 2007 (has links) (PDF)
zweimal im Jahr erscheinende Zeitschrift über aktuelle Themen der TU Chemnitz, ergänzt von Sonderheft(en)
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TU-Spektrum 2/2007, Magazin der Technischen Universität ChemnitzSteinebach, Mario, Thehos, Katharina, Häckel-Riffler, Christine, Brabandt, Antje, Mahler, Janine, Chlebusch, Michael, Doriath, Thomas, Leithold, Nicole, Linne, Carina 14 September 2007 (has links)
zweimal im Jahr erscheinende Zeitschrift über aktuelle Themen der TU Chemnitz, ergänzt von Sonderheft(en)
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