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1
Clarke, Benjamin Paul, Cesar Lemas, Jorge Barrera, Mugi Batbayar, Corbin Goldsmith, Benjamin Paul Clarke, Cesar Lemas, Jorge Barrera, Mugi Batbayar, and Corbin Goldsmith. "Ore Characterization and Processing Plant Remediation for a Brazilian Tin Mine." Thesis, The University of Arizona, 2017. http://hdl.handle.net/10150/624946.
Full textAbstract:
Executive Summary: To further understand the separation process used by CSN-ERSA in Brazil, ore characterization of final
concentrate samples was determined through Energy Dispersive Spectroscopy (EDS) testing.
Characterization of each concentrate shows a significant amount of heavy metal contamination; a result of
inefficient gravity separation.
CSN is looking to implement a mining method suitable for extracting ore at the Village site. The three
options of mining methods are open-pit with gravel pumping, dredging, and a conveyor system. The
conveyor system is recommended as the primary mining method because conveyors can upgrade
production capacity, along with minimizing capital and annual costs. Also, they provide path adaptability
by operating in steeper terrain.
Gravity separation methods and recommendations for mineral processing at the Taboquiñha site is
discussed. These include spirals, hydrocyclones, Knelson, Falcon, and tables. The final recommendation
is a combination of methods, with variation depending on focus. Much like current operations, spirals and
hydrocyclones can receive most of the material. For recovering fines, installing a Falcon gravity separator
is recommended. The currently reprocessed middling could see improvements if a table separator were
installed. For recovering tin lost in the tailings, it is recommended to use a Falcon separator.
2
Yada, Marcela Midori [UNESP]. "Atributos químicos e bioquímicos em solos degradados por mineração em ecossistema amazônico em recuperação." Universidade Estadual Paulista (UNESP), 2011. http://hdl.handle.net/11449/88224.
Full textAbstract:
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Os recursos naturais fazem da região amazônica um importante pólo para a agricultura e a exploração mineral. Entretanto, a falta de moderação na exploração causa a diminuição da matéria orgânica do solo com perda de seu potencial produtivo ou de regeneração da mata nativa. A recuperação destas áreas é de fundamental importância até mesmo para a manutenção da atividade física, química e biológica do solo. O plano de recuperação das áreas degradadas iniciou em 1997, uma série de pesquisas com a finalidade de definir estratégias para recuperação da área degradada por mineração de cassiterita na Floresta Nacional do Jamari, em Rondônia. As áreas foram classificadas em diferentes níveis de recuperação. O presente trabalho teve por objetivo avaliar os atributos químicos e bioquímicos nos solos das áreas degradadas pela mineração de cassiterita submetidos aos processos de recuperação nas minas Serra da Onça e Santa Maria. As análises dos atributos químicos e bioquímicos do solo contribuem para a caracterização das áreas degradadas por mineração em processo de recuperação podendo identificar áreas que estão em estágio avançado de recuperação comparado com as áreas de mata e de capoeira
The situation and the environmental resources of Amazon Basin make it import for agriculture and mineral extraction, both causing the destruction of soil organic matter with the loss of the soil fertility, that it became improper to agriculture of is not able to support the restore of the native forest. The recuperation of these areas is important for the maintenance of the physical, chemical and biological activity of the soil and plant growth. The plan of recuperation of degraded areas started in 1997, in a research with the purpose to define strategies for a process of recuperation of the area degraded by mining of tin ore in the National Forest of Jamari, Rondônia state. Different areas had been classified in according to their level of recuperation. The objective of this work was to evaluate chemical and biochemical attributes in soils of degraded areas submitted to mining of tin ore in different stages of restoring process in Amazon Basin. The analyses of quantification of chemistry and biochemistry attributes in degraded soils submitted to recuperation program contribute for the characteristic of the different areas
3
Yada, Marcela Midori. "Atributos químicos e bioquímicos em solos degradados por mineração em ecossistema amazônico em recuperação /." Jaboticabal : [s.n.], 2011. http://hdl.handle.net/11449/88224.
Full textAbstract:
Orientador: Wanderley José de MeloBanca: Mara Cristina Pessoa da Cruz
Banca: Elcio Liborio Balota
Resumo: Os recursos naturais fazem da região amazônica um importante pólo para a agricultura e a exploração mineral. Entretanto, a falta de moderação na exploração causa a diminuição da matéria orgânica do solo com perda de seu potencial produtivo ou de regeneração da mata nativa. A recuperação destas áreas é de fundamental importância até mesmo para a manutenção da atividade física, química e biológica do solo. O plano de recuperação das áreas degradadas iniciou em 1997, uma série de pesquisas com a finalidade de definir estratégias para recuperação da área degradada por mineração de cassiterita na Floresta Nacional do Jamari, em Rondônia. As áreas foram classificadas em diferentes níveis de recuperação. O presente trabalho teve por objetivo avaliar os atributos químicos e bioquímicos nos solos das áreas degradadas pela mineração de cassiterita submetidos aos processos de recuperação nas minas Serra da Onça e Santa Maria. As análises dos atributos químicos e bioquímicos do solo contribuem para a caracterização das áreas degradadas por mineração em processo de recuperação podendo identificar áreas que estão em estágio avançado de recuperação comparado com as áreas de mata e de capoeira
Abstract: The situation and the environmental resources of Amazon Basin make it import for agriculture and mineral extraction, both causing the destruction of soil organic matter with the loss of the soil fertility, that it became improper to agriculture of is not able to support the restore of the native forest. The recuperation of these areas is important for the maintenance of the physical, chemical and biological activity of the soil and plant growth. The plan of recuperation of degraded areas started in 1997, in a research with the purpose to define strategies for a process of recuperation of the area degraded by mining of tin ore in the National Forest of Jamari, Rondônia state. Different areas had been classified in according to their level of recuperation. The objective of this work was to evaluate chemical and biochemical attributes in soils of degraded areas submitted to mining of tin ore in different stages of restoring process in Amazon Basin. The analyses of quantification of chemistry and biochemistry attributes in degraded soils submitted to recuperation program contribute for the characteristic of the different areas
Mestre
4
Weinhold, Günter. "Die Zinnerz-Lagerstätte Altenberg/Osterzgebirge." Sächsisches Landesamt für Umwelt und Geologie, 2002. https://slub.qucosa.de/id/qucosa%3A1426.
Full textAbstract:
Nach einem kurzen geografischen Überblick wird die fast 550-jährige Bergbaugeschichte der bedeutendsten Zinnerz-Lagerstätte des Erzgebirges dargestellt. Besondere Erwähnung findet die geologisch-lagerstättenkundliche Erforschung in den letzten 50 Jahren des ausgehenden 20. Jahrhunderts. Einer Einführung zur regionalgeologischen Position, zum Bau und zur metallogenetischen Situation des Erzfeldes folgen ausführliche Abhandlungen zur Geologie, Tektonik und Mineralisation der Lagerstätte, ebenso zu den angrenzenden Erzrevieren. Kapitel zur Rohstoffcharakteristik, Geophysik, Hydrologie/Hydrogeologie und Ingenieurgeologie Bergbau- und Aufbereitungstechnik, die dazugehörigen Technologien aus den einzelnen Epochen sowie Produktions- und Bilanzbetrachtungen geben ein umfassendes Bild zur Lagerstätte.
Die heutzutage wichtigen Themen wie Umweltbelastung und -sanierung, Verwahrung, Rekultivierung und geomechanische Prognosen des Pingenrandes runden die komplexe Darstellung ab.
5
Hösel, Günter, Erich Fritsch, Ulrich Josiger, and Peter Wolf. "Das Lagerstättengebiet Geyer." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2011. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-79143.
Full textAbstract:
Die Monographie des Lagerstättengebietes Geyer bildet in räumlicher und inhaltlicher Hinsicht eine Fortsetzung und Ergänzung der 1994 veröffentlichten Monographie des Zinnerzlagerstättengebietes Ehrenfriedersdorf. Im Lagerstättengebiet Geyer lassen sich mehrere Lagerstättentypen unterscheiden. Verbreitet sind stratiforme Typen. Hierzu gehören Sulfiderzlager vom Typ Kiesgrube, die Bildungen der prävariszischen Geosynklinaletappe darstellen, und Skarnlager, die genetisch zum variszischen Mineralisationszyklus zählen. Unter den zinnführenden Strukturen erlangt der stockwerkartige metasomatische Strukturtyp im Endokontakbereich die größte Bedeutung. Gangförmige zinnerzführende Ausfüllungsstrukturen im Exokontakt sind in geringerer Intensität als im benachbarten Ehrenfriedersdorfer Revier verbreitet. Hydrothermale Gangstrukturen erlangen keine Lagerstättenbedeutung. Die in den Gängen auftretenden Mineralisationen lassen sich sowohl dem variszischen als auch dem postvariszisch-saxonischen Mineralisationszyklus zuordnen. Die Beschreibung der Lagerstätten und Vorkommen umfaßt die Kiesgrube Geyer (Sulfiderzlager), den Schurf 14/67 (Skarntyp), das Lagerstättengebiet Geyer SW (Skarntyp), die Zinnlagerstätte Geyer (Greisentyp), den Schurf 1/61 (Skarntyp und Gangtyp), das Revier Spitzberg mit dem Spitzberger Erbstolln sowie den Schürfen 2/68 und 2/69 (Skarntyp und Gangtyp), das Revier Geyer NO (Gangtyp) und Zinnseifen. Angaben zum Altbergbau und zu den Aufschlußverhältnissen stehen am Beginn jeder Lagerstättenbeschreibung. Es folgt eine lithostratigraphische Zuordnung der aufgeschlossenen metamorphen Schichtenfolge, eine kurze petrographische Charakterisierung der auftretenden magmatischen Gesteine und eine Beschreibung der tektonischen Elemente. Die eigentliche Lagerstättencharakteristik umfaßt Ausbildung, räumliche Position und Form der Erzkörper sowie Paragenese und Verteilungsgesetzmäßigkeiten. Die in den Aufschlüssen der ehem. SDAG Wismut angetroffene Uranvererzung, ihre tektonische und lithologische Kontrolle, wird mit beschrieben. Unter den bergbautechnischen Angaben nehmen die Ergebnisse von Aufbereitungsversuchen den größten Raum ein. Hydro- und ingenieurgeologische Fakten sowie Abbaumethoden finden nur stichwortartig Erwähnung. Unter bergwirtschaftlichen Angaben werden Bemusterungsmethoden, Bemusterungsergebnisse und, soweit möglich, Vorratszahlen mitgeteilt. Altlasten sind geogen und anthropogen bedingt. Von besonderer Bedeutung sind anthropogen bedingte Arsen-Anomalien im Boden (Hüttenwerke, Pochwerke). Verwahrung, Sanierung und Rekultivierung ehemals bergbaulich genutzter Flächen lassen sich im Lagerstättengebiet Geyer relativ problemlos lösen.
6
Hösel, Günter. "Das Zinnerz-Lagerstättengebiet Ehrenfriedersdorf/Erzgebirge." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2011. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-78881.
Full textAbstract:
Die 1990 stillgelegte Grube kann auf eine 750-jährige Bergbaugeschichte zurückblicken. Im vorliegenden Band werden vor allem die Ergebnisse der umfangreichen Such- und Erkundungsarbeiten der letzten Betriebsperiode zusammenfassend dargelegt. Die Rahmengesteine bilden amphibol- bis grünschieferfaziell geprägte Metamorphite proterozoischer und kambrischer Ausgangsgesteine. Die metamorphe Schichtenfolge wird unterlagert vom mittelerzgebirgischen Teilpluton, in dem vier Granittypen unterschieden werden, die petrographisch und geochemisch eine Entwicklungsreihe bilden. Die Lagerstättentektonik wird von einer diagonalen Scherflächentektonik bestimmt. Zwischen Deformation, Magmatismus, Metasomatose und Mineralisation bestehen enge genetische Beziehungen. Zeitlich lassen sich die Zinnmineralisationen nach Altersdatierungen zwischen 288 und 302 Millionen Jahren einordnen. Unter den zinnerzführenden Strukturen erlangen Ausfüllungsstrukturen (Trümerzüge, Gangzüge) die größte Bedeutung. Bei den metasomatischen Strukturen lassen sich gangförmige (Greisengänge im Exokontakt, gangartige Greisenzonen im Endokontakt), stockwerkartige (unregelmäßige Greisenkörper im Endokontakt) und lagerförmige Strukturen (Skarne) unterscheiden. Intensive pedo- und lithogeochemische Untersuchungen führten zur Berechnung von Zonalitätsreihen und zur Ableitung von Zonalitätskoeffizienten in mehreren Teillagerstätten. Die Verteilung bestimmter Spurenelemente im Kassiterit wird, abhängig vom Chemismus der zinnführenden Lösungen, vor allem durch die räumliche Position zum Granit und durch die Lithologie des Nebengesteins bestimmt. Innerhalb des gesamten variszischen Mineralisationszyklus zeigen Temperatur und Salinität der Lösungen eine relativ gleichförmige Entwicklung von höheren zu niedrigeren Werten an. Das geomechanische Verhalten des Gebirges und mögliche Auswirkungen auf die Tagesoberfläche werden entscheidend beeinflusst von den gewählten Abbauverfahren, der Lage der Abbaue in Bezug zur Erdoberfläche und der lokalen geologischen Situation. Die älteste Abbaumethode im Festgestein ist der Strossenbau. Der Firstenstoßbau kam nur in unbedeutendem Umfang zur Anwendung. In der letzten Bergbauperiode wurde der Firstenstoßbau mit Magazinierung eingeführt. Greisenkörper wurden im Teilsohlenkammerbau, die bis 40 m mächtigen Trümerzüge des Nordwestfeldes im Teilsohlenbruchbau gewonnen. Die Bemusterung der Auffahrungen geschah durch Schlitzproben, der bergmännisch nicht aufgeschlossenen Lagerstättenbereiche durch Bohrkern- oder Bohrschlammproben. Tiefbohrungen wurden mittels Sammelsplitter- und Kernproben bemustert. Mit Einstellung des Bergbaus ist im Lagerstättendistrikt Ehrenfriedersdorf bei Trümer- und Greisenerz ein Vorratsstand von 17,1 kt zu verzeichnen. Die Hauptaltlast des Erzbergbaus stellt Arsen dar. Besondere Bedeutung erlangen anthropogen bedingte As-Anomalien (Hüttenwerke, Pochwerke, Aufbereitungsrückstände).
7
Hösel, Günter. "Das Zinnerz-Lagerstättengebiet Ehrenfriedersdorf/Erzgebirge." Sächsisches Landesamt für Umwelt, Landwirtschaft und Geologie, 1994. https://slub.qucosa.de/id/qucosa%3A1643.
Full textAbstract:
Die 1990 stillgelegte Grube kann auf eine 750-jährige Bergbaugeschichte zurückblicken. Im vorliegenden Band werden vor allem die Ergebnisse der umfangreichen Such- und Erkundungsarbeiten der letzten Betriebsperiode zusammenfassend dargelegt. Die Rahmengesteine bilden amphibol- bis grünschieferfaziell geprägte Metamorphite proterozoischer und kambrischer Ausgangsgesteine. Die metamorphe Schichtenfolge wird unterlagert vom mittelerzgebirgischen Teilpluton, in dem vier Granittypen unterschieden werden, die petrographisch und geochemisch eine Entwicklungsreihe bilden. Die Lagerstättentektonik wird von einer diagonalen Scherflächentektonik bestimmt. Zwischen Deformation, Magmatismus, Metasomatose und Mineralisation bestehen enge genetische Beziehungen. Zeitlich lassen sich die Zinnmineralisationen nach Altersdatierungen zwischen 288 und 302 Millionen Jahren einordnen. Unter den zinnerzführenden Strukturen erlangen Ausfüllungsstrukturen (Trümerzüge, Gangzüge) die größte Bedeutung. Bei den metasomatischen Strukturen lassen sich gangförmige (Greisengänge im Exokontakt, gangartige Greisenzonen im Endokontakt), stockwerkartige (unregelmäßige Greisenkörper im Endokontakt) und lagerförmige Strukturen (Skarne) unterscheiden. Intensive pedo- und lithogeochemische Untersuchungen führten zur Berechnung von Zonalitätsreihen und zur Ableitung von Zonalitätskoeffizienten in mehreren Teillagerstätten. Die Verteilung bestimmter Spurenelemente im Kassiterit wird, abhängig vom Chemismus der zinnführenden Lösungen, vor allem durch die räumliche Position zum Granit und durch die Lithologie des Nebengesteins bestimmt. Innerhalb des gesamten variszischen Mineralisationszyklus zeigen Temperatur und Salinität der Lösungen eine relativ gleichförmige Entwicklung von höheren zu niedrigeren Werten an. Das geomechanische Verhalten des Gebirges und mögliche Auswirkungen auf die Tagesoberfläche werden entscheidend beeinflusst von den gewählten Abbauverfahren, der Lage der Abbaue in Bezug zur Erdoberfläche und der lokalen geologischen Situation. Die älteste Abbaumethode im Festgestein ist der Strossenbau. Der Firstenstoßbau kam nur in unbedeutendem Umfang zur Anwendung. In der letzten Bergbauperiode wurde der Firstenstoßbau mit Magazinierung eingeführt. Greisenkörper wurden im Teilsohlenkammerbau, die bis 40 m mächtigen Trümerzüge des Nordwestfeldes im Teilsohlenbruchbau gewonnen. Die Bemusterung der Auffahrungen geschah durch Schlitzproben, der bergmännisch nicht aufgeschlossenen Lagerstättenbereiche durch Bohrkern- oder Bohrschlammproben. Tiefbohrungen wurden mittels Sammelsplitter- und Kernproben bemustert. Mit Einstellung des Bergbaus ist im Lagerstättendistrikt Ehrenfriedersdorf bei Trümer- und Greisenerz ein Vorratsstand von 17,1 kt zu verzeichnen. Die Hauptaltlast des Erzbergbaus stellt Arsen dar. Besondere Bedeutung erlangen anthropogen bedingte As-Anomalien (Hüttenwerke, Pochwerke, Aufbereitungsrückstände).
8
Hösel, Günter, Erich Fritsch, Ulrich Josiger, and Peter Wolf. "Das Lagerstättengebiet Geyer." Sächsisches Landesamt für Umwelt, Landwirtschaft und Geologie, 1986. https://slub.qucosa.de/id/qucosa%3A1652.
Full textAbstract:
Die Monographie des Lagerstättengebietes Geyer bildet in räumlicher und inhaltlicher Hinsicht eine Fortsetzung und Ergänzung der 1994 veröffentlichten Monographie des Zinnerzlagerstättengebietes Ehrenfriedersdorf. Im Lagerstättengebiet Geyer lassen sich mehrere Lagerstättentypen unterscheiden. Verbreitet sind stratiforme Typen. Hierzu gehören Sulfiderzlager vom Typ Kiesgrube, die Bildungen der prävariszischen Geosynklinaletappe darstellen, und Skarnlager, die genetisch zum variszischen Mineralisationszyklus zählen. Unter den zinnführenden Strukturen erlangt der stockwerkartige metasomatische Strukturtyp im Endokontakbereich die größte Bedeutung. Gangförmige zinnerzführende Ausfüllungsstrukturen im Exokontakt sind in geringerer Intensität als im benachbarten Ehrenfriedersdorfer Revier verbreitet. Hydrothermale Gangstrukturen erlangen keine Lagerstättenbedeutung. Die in den Gängen auftretenden Mineralisationen lassen sich sowohl dem variszischen als auch dem postvariszisch-saxonischen Mineralisationszyklus zuordnen. Die Beschreibung der Lagerstätten und Vorkommen umfaßt die Kiesgrube Geyer (Sulfiderzlager), den Schurf 14/67 (Skarntyp), das Lagerstättengebiet Geyer SW (Skarntyp), die Zinnlagerstätte Geyer (Greisentyp), den Schurf 1/61 (Skarntyp und Gangtyp), das Revier Spitzberg mit dem Spitzberger Erbstolln sowie den Schürfen 2/68 und 2/69 (Skarntyp und Gangtyp), das Revier Geyer NO (Gangtyp) und Zinnseifen. Angaben zum Altbergbau und zu den Aufschlußverhältnissen stehen am Beginn jeder Lagerstättenbeschreibung. Es folgt eine lithostratigraphische Zuordnung der aufgeschlossenen metamorphen Schichtenfolge, eine kurze petrographische Charakterisierung der auftretenden magmatischen Gesteine und eine Beschreibung der tektonischen Elemente. Die eigentliche Lagerstättencharakteristik umfaßt Ausbildung, räumliche Position und Form der Erzkörper sowie Paragenese und Verteilungsgesetzmäßigkeiten. Die in den Aufschlüssen der ehem. SDAG Wismut angetroffene Uranvererzung, ihre tektonische und lithologische Kontrolle, wird mit beschrieben. Unter den bergbautechnischen Angaben nehmen die Ergebnisse von Aufbereitungsversuchen den größten Raum ein. Hydro- und ingenieurgeologische Fakten sowie Abbaumethoden finden nur stichwortartig Erwähnung. Unter bergwirtschaftlichen Angaben werden Bemusterungsmethoden, Bemusterungsergebnisse und, soweit möglich, Vorratszahlen mitgeteilt. Altlasten sind geogen und anthropogen bedingt. Von besonderer Bedeutung sind anthropogen bedingte Arsen-Anomalien im Boden (Hüttenwerke, Pochwerke). Verwahrung, Sanierung und Rekultivierung ehemals bergbaulich genutzter Flächen lassen sich im Lagerstättengebiet Geyer relativ problemlos lösen.
9
Grund, Klaus. "Bergbau zwischen Tradition und Zukunft, Vorbereitung zum Neuaufschluss einer Wolfram-Zinn-Lagerstätte im Erzgebirge." Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2017. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-228383.
Full textAbstract:
Die SME AG ist das erste Bergbauunternehmen, das seit Jahrzehnten ein neues Erzbergwerk erschließen und in Betrieb nehmen will. Traditionsreiche Bergbauunternehmen haben in der Vergangenheit neue Standorte, auf der Grundlage vorhandener Personalstrukturen, vorhandener Technik und Technologien, erschlossen. Im nachfolgenden Beitrag wird die strategische Herangehensweise der SME AG beschrieben, um zeitnah mit der Gewinnung in der Wolfram-Zinn-Lagerstätte zu beginnen.
10
Weinhold, Günter. "Die Zinnerz-Lagerstätte Altenberg/Osterzgebirge." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2011. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-73868.
Full textAbstract:
Nach einem kurzen geografischen Überblick wird die fast 550-jährige Bergbaugeschichte der bedeutendsten Zinnerz-Lagerstätte des Erzgebirges dargestellt. Besondere Erwähnung findet die geologisch-lagerstättenkundliche Erforschung in den letzten 50 Jahren des ausgehenden 20. Jahrhunderts. Einer Einführung zur regionalgeologischen Position, zum Bau und zur metallogenetischen Situation des Erzfeldes folgen ausführliche Abhandlungen zur Geologie, Tektonik und Mineralisation der Lagerstätte, ebenso zu den angrenzenden Erzrevieren. Kapitel zur Rohstoffcharakteristik, Geophysik, Hydrologie/Hydrogeologie und Ingenieurgeologie Bergbau- und Aufbereitungstechnik, die dazugehörigen Technologien aus den einzelnen Epochen sowie Produktions- und Bilanzbetrachtungen geben ein umfassendes Bild zur Lagerstätte.
Die heutzutage wichtigen Themen wie Umweltbelastung und -sanierung, Verwahrung, Rekultivierung und geomechanische Prognosen des Pingenrandes runden die komplexe Darstellung ab.
11
Grabow, Gerd. "Zum 175. Geburtstag Alfred Wilhelm Stelzners, eines verdienstvollen Wissenschaftlers auf dem Gebiet der Geologie und der Lagerstättenlehre." Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2016. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-210763.
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12
Grabow, Gerd. "Zum 175. Geburtstag Alfred Wilhelm Stelzners, eines verdienstvollen Wissenschaftlers auf dem Gebiet der Geologie und der Lagerstättenlehre." ACAMONTA 22(2015), 2015. https://tubaf.qucosa.de/id/qucosa%3A23082.
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Saad, Allan Emile. "A petrological study of the tin-tungsten deposit at Renosterkop, Augrabies, Northern Cape Province / by Allan Emile Saad." Thesis, Potchefstroom University for Christian Higher Education, 1987. http://hdl.handle.net/10394/606.
Full textAbstract:
Renosterkop is a large low grade tin-tungsten-zinc deposit located 85km
WSW of Upington in the northern Cape Province, South Africa. The
mineralization is hosted by a number of shallow-dipping, sheeted greisen
bodies that are surrounded by, and partly intercalated with a well foliated
granite gneiss country rock. The gneiss is taken to belong to the
intrusive Riemvasmaak gneiss of the Namaqualand Metamorphic Complex.
The mineralized host (referred to as TBQ) is a grey, homogeneous, fine
to medium grained rock composed predominantly of quartz, biotite and
topaz with minor amounts of fluorite and accessory opaque minerals,
zircon and secondary chlorite. The unmineralized granite gneiss country
rock is medium-to coarse-grained, pinkish in colour and composed
primarily of microcline, plagioclase, quartz and biotite, with or without
hornblende. Rock types, transitional in mineralogy but with clearly
distinguishable contacts, are present between the TBQ and the granite
gneiss.
A prominent chemical and mineralogical halo, 20m to 50m wide, envelopes
the Renosterkop deposit. There is a gradational transition from an
unaltered hornblende biotite gneiss, through gneiss containing greenish-brown
biotite to an approximately 2 m wide transition zone, characterized
by the partial replacement of the greenish-brown biotite by chlorite.
The transition zone in turn yields to the TBQ in which reddish-brown
biotite forms at the expense of the chlorite, and topaz, quartz and
fluorite are formed at the expense of the feldspar. Major and trace
element analyses show a spectrum of chemical compositions with coherent
trends that support a gradational transition from the hornblende-bearing
granite gneiss, through the transitional rock types to the TBQ.
The mineralogical and chemical characteristics of the Renosterkop rock
types are consistent with an origin by progressive greisenization of a
"within plate" A- type granitoid host rock. A genetic model is proposed
which involves the formation of the TBQ greisen during intense
metasomatic alteration and replacement of the granite gneiss within a zone
of structural weakness that provided conduits for migrating, F-rich,
metal-bearing solutions, and thereby inherited the foliation and
structural features present in the original granite gneiss.Thesis (MSc)--PU vir CHO, 1987.
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Stickley, Elizabeth. "One Eyed Suze." Digital Commons at Loyola Marymount University and Loyola Law School, 2018. http://www.kaltura.com/tiny/gxxur.
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One Eyed Suze is an animated, anthology series that follows One Eyed Suze, former leader of the Loco Litter, after she is betrayed and left for dead by her own. She's rescued by a dimwitted rancher named Elliot and they embark on a journey of revenge and redemption.
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Eliasson, Line Viktoria. "Rett ord til rett tid? : En kvantitativ innholdsanalyse av partilederdebattene fra valgkampen 2011." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for sosiologi og statsvitenskap, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-16987.
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Denne oppgaven er en studie av den politiske retorikken under valgkampen 2011; en valgkamp som fant sted i kjølvannet av terrorhandlingene på Utøya og i Regjeringskvartalet 22. juli samme år. Oppgaven tar utgangspunkt i teori om massemedienes spilleregler, hvordan disse endrer seg under nasjonale kriser og hvilke konsekvenser dette har for befolkningen og politikerne i et land. Ved hjelp av kvantitative analyser av partilederdebatter fra valgkampene i 2011 og 2007, gir oppgaven svar på problemstillingen: Hvordan påvirket terrorhandlingene 22. juli 2011 retorikken i den påfølgende valgkampen? Resultatene viser at valgkampretorikken var noe mildere under 2011- valgkampen, sammenlignet med valgkampen i 2007. I alle de utvalgte 2011-debattene rettet partilederne færre angrep mot de øvrige partiene, og de gjorde færre forsøk på å avbryte hverandre. Andelen personangrep var imidlertid ikke redusert under 2011-debattene. De største endringene i debattklimaet fant sted i den innledende 2011-debatten, da forhold som dreide seg om 22. juli- angrepene ble diskutert. I dette tilfellet tilpasset politikerne seg det alvorlige temaet ved å opptre mer respektfullt overfor hverandre. Da vanlige valgkampssaker var tema for diskusjon, var tonen i debatten mer lik den vi kjenner fra tidligere valgkamper. Selv om partilederdebattene fra 2011 var noe annerledes enn debattene fra 2007, var disse endringene altså ikke spesielt dominerende. Dette tyder på at partilederdebatter er institusjoner med lange tradisjoner, noe som gjør at de vanskelig endrer form.
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Chi, Guoxiang. "Contrôle polygénétique sur la localisation des gisements proximaux et distaux dans le champ polymétallique-stannifère à Xinlu, Guangxi, Chine méridionale /." Thèse, Chicoutimi : Université du Québec à Chicoutimi, 1992. http://theses.uqac.ca.
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Kaplan, Randy Barbara. "The pre-leftist one-act dramas of Tian Han (1898-1968)." Connect to resource, 1986. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1227544118.
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Naude, Karin. "A mineralogical and geochemical study of the tin deposit at NAD-mine in the Rooiberg tin field." Thesis, Stellenbosch : Stellenbosch University, 1994. http://hdl.handle.net/10019.1/58243.
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Thesis (MSc.)--Stellenbosch University, 1994.ENGLISH ABSTRACT: The NAD deposit forms part of the A-Mine Complex in the Rooiberg tin field in the north-western Transvaal. Mining started in 1986 and the mine was closed recently following a decline of tin prices and metallurgical problems with ore recovery. The deposit is hosted by the Boschoffsberg Quartzite Member of the Pretoria Group sediments and is structurally controlled within the so-called Tin Zone. Extensive alteration of the original host rocks occurred during the mineralisation event. Potassic remobilisation and redistribution appear to have taken place pervasively. The nature of the original host rock was altered to such an extent that it cannot be classified correctly. Previous workers refer to the host rock as an arkose because of its feldspathic nature. Wall rock alteration in the hanging- and foot wall of the different ore lodes (fractures) is generally similar. Very little change is observed in whole rock chemistry away from the lodes. The mineral chemistry of the ore lode minerals is indicative of fluid composition and mineralising conditions in the NAD deposit. The FeO/(FeO + MgO) ratio of tourmalines indicates deposition at a distance from the source of the mineralising fluids. Pyrite trace element chemistry differs from that of the Leeuwpoort deposit, indicating changing fluid chemistry. Contrary to previous assumptions that the carbonate present is ankerite, abundant siderite occurrences were found. Pyrite may co-precipitate with siderite under specific physico-chemical conditions. Cassiterite is generally trace element poor and relatively enriched in Fe. Hydraulic brecciation of the fractures as well as the tourmaline chemistry are strong indicators of a hydrothermal origin for the NAD deposit. However, the origin of the hydrothermal fluids is still uncertain.
AFRIKAANSE OPSOMMING: Die NAD- tinafsetting vorm dee/ van die A-Myn-kompleks in die Rooiberg tinveld in die noord-wes Transvaal. Die myn is in 1986 geopen en is onlangs gesluit weens swak tinpryse en metallurgiese ertsherwinningsprobleme. Die tinafsetting kom voor in die Boschoffsberg Kwartsiet lid van die Pretoria Groep sedimente. Dit is strukturee/ gekontroleer binne die sogenaamde Tin Sone. Vorige navorsers het na die waardgesteente as 'n arkose verwys op grand van die hoe veldspaat-inhoud. lntensiewe en uitgebreide verandering van die oorspronklike waardgesteentes het plaasgevind tydens mineralisasie. Deurdringende kalium-hermobilisering en -herverspreiding het plaasgevind. Die aard van die oorspronklike waardgesteente is egter tot so 'n mate verander, dat dit chemies nie korrek gek/assifiseer kan word nie. Wandrotsverandering van die verskil/ende ertsskeute in beide die voet- en dakgesteentes is baie soortge/yk. Die heelrotsgeochemie van die wandgesteentes verskil baie min weg van die ertsskeute af. Die mineraalchemie van die ertsskeut-minerale is aanduidend van die v/oeistofsamestelling en mineralisasietoestande van die NAD-tinafsetting. Die FeO/(FeO + MgO) verhouding van toermalyne dui daarop dat afsetting op 'n afstand vanaf die bron van die mineralisasie-vloeistowwe plaasgevind het. Die spoor-elementchemie van die NAD-piriete verskil van die piriete van die Leeuwpoort tinafsetting, wat verandering in vloeistofsamestelling aandui. In teenstelling met vorige aannames dat die karbonate in die Rooiberg tinafsettings as ankeriet bekend staan, is daar volop sideriet gevind. Piriet kristalliseer dikwels saam met sideriet onder spesifieke fisiese en chemiese toestande. Kassiteriet is meestal arm aan spoor-elemente, maar is relatief verryk in Fe. Hidroliese breksiering van die skeute en die toermalyn-chemie dui sterk op 'n hidrotermale oorsprong vir die NAD afsetting. Die bron van die vloeistowwe is nog nie definitief vasgestel nie.
Digitized at 300 dpi Colour PDF format (OCR), using ,KODAK i 1220 PLUS scanner. Digitised, Ricardo Davids on request from IBL 10 September 2013
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Tran, Hoang Anh. "One-Dimensional Nanostructure and Sensing Applications: Tin Dioxide Nanowires and Carbon Nanotubes." PDXScholar, 2016. http://pdxscholar.library.pdx.edu/open_access_etds/2689.
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The key challenge for a nanomaterial based sensor is how to synthesize in bulk quantity and fabricate an actual device with insightful understanding of operational mechanisms during performance. I report here effective, controllable methods that exploit the concepts of the "green approach" to synthesize two different one-dimensional nanostructures, including tin oxide nanowires and carbon nanotubes. The syntheses are followed by product characterization and sensing device fabrications as well as sensor performance understanding at the molecular level. Sensor-analyte response and recovery kinetics are also presented.
The first part of the thesis describes bulk-scale synthesis and characterization of tin oxide nanowires by the molten salt synthetic method and the nanowire doping with antimony (n-types) and lithium. The work builds on the success of using n-doped SnO2 nanoparticles to selectively detect chlorine gas at room temperature. Replacing n-doped nanoparticles with n-doped nanowires reduces the number of inter-particle electron hops between sensing electrodes. The nanowire based sensors show unprecedented 5 ppb detectability of corrosive Cl2 gas concentration in air. At the higher range, 10 ppm of Cl2 gas leads to a 250 fold increase in the device resistance. During sensor recovery, FT-IR studies show that dichlorine monoxide (Cl2O) and chlorine dioxide (ClO2) are the desorbing species. Long term stability of devices is affected by lattice oxygen vacancies replaced by chlorine atoms.
Bulk-scale synthesis of multiwall carbon nanotube (MWCNTs) was achieved by a novel inexpensive synthetic method. The green chemistry method uses the non-toxic and easy to handle solid carbon source naphthalene. The synthesis is carried out by simply heating naphthalene and organometallic precursors as catalysts in a sealed glass tube. Synthesis at 610º C leads to MWCNTs of 50 nm diameter and lengths exceeding well over microns. MWCNT doping is attempted with nitrogen (n-type) and boron (p-type) precursors. Palladium nanoparticles decorated on as-synthesized MWCNTs are employed for specific detection of explosive hydrogen gas with concentrations far below the explosive concentration limits. During performance, the sensor exhibits abnormal response behaviors at hydrogen gas concentrations higher than 1%. A model of charge carrier inversion, brought about by reduction of MWCNT by hydrogen molecules dissociated by Pd nanoparticles is proposed.
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Webb, Melessia D. "Relaxation Seminars, Ten one-hours sessions." Digital Commons @ East Tennessee State University, 2002. https://dc.etsu.edu/etsu-works/8507.
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Kabre, Tushar Shriram. "Co3O4 Thin Films: Sol-Gel Synthesis, Electrocatalytic Properties & Photoelectrochemistry." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1316552072.
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Pototskyy, Andriy. "Pattern formation in thin one- and two-layer liquid films." kostenfrei, 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=978408845.
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Ermakova, Anna V. "One or More External Representations: What Is Better for Learning?" Thesis, Boston College, 2016. http://hdl.handle.net/2345/bc-ir:107097.
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Thesis advisor: Elida V. LaskiUse of base-10 decomposition strategy for addition in first grade is related to mathematics advantage in the later years (Geary et al., 2013), yet we know little about the strategy’s prevalence among first graders or factors contributing to its use. The present study sought to bridge this gap by testing 87 first graders in the greater Boston area. The results confirmed previous findings that showed that in the last 10 years first graders in the US have increased in frequency of base-10 decomposition. Children who had better knowledge of basic number facts used it more frequently, particularly on problems with smaller addends. Further, the study tested whether an instructional intervention would be effective in increasing reliance on base-10 decomposition. 61 of the original participants were selected to take part in an experimental intervention that taught them to execute the strategy while relying on external representations – sometimes known as manipulatives. Informed by two lines of research, the present study tested the hypothesis that the efficacy of the intervention may depend on whether one or multiple external representations are used for instruction. The results showed a dramatic increase in first graders’ mental base-10 decomposition use as a result of the intervention. Children grew in their use of the strategy at the same rates across genders, levels of basic arithmetic fluency, and working memory. Overall, the results showed that relying on multiple representations during instruction appears more beneficial to strategy use on mental arithmetic, but this benefit may be conditional on how well the children have mastered and abstracted the strategy. Implications to classroom interventions aimed to increase the use of advanced arithmetic strategies are discussed
Thesis (PhD) — Boston College, 2016
Submitted to: Boston College. Lynch School of Education
Discipline: Counseling, Developmental and Educational Psychology
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You, Tao. "Preparation and characterization of ceramic sensors for use at elevated temperatures /." View online ; access limited to URI, 2005. http://0-wwwlib.umi.com.helin.uri.edu/dissertations/dlnow/3186928.
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Cognard, Gwenn. "Electrocatalyseurs à base d’oxydes métalliques poreux pour pile à combustible à membrane échangeuse de protons." Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAI007.
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Les électrocatalyseurs conventionnels utilisés dans les piles à combustibles à membrane échangeuse de protons (PEMFC) sont composés de nanoparticules de platine supportées sur des noirs de carbone de forte surface spécifique. A la cathode de la PEMFC, siège de la réaction de réduction de l’oxygène (ORR), le potentiel électrochimique peut atteindre des valeurs élevées - notamment lors de phases arrêt-démarrage - engendrant des dégradations irréversibles du support carboné. Une solution « matériaux » consiste à remplacer ce dernier par des supports à base d’oxydes métalliques. Ceux-ci doivent être résistants à la corrosion électrochimique, conducteurs électroniques et posséder une structure poreuse et nano-architecturée (permettant le transport des réactifs et produits et une distribution homogène de l’ionomère et des nanoparticules de platine). Dans ce travail, nous avons donc élaboré et caractérisé des électrocatalyseurs à base de nanoparticules de platine (Pt) déposées sur du dioxyde d’étain (SnO₂) et de titane (TiO₂) texturés (morphologies aérogel, nanofibres ou « loosetubes ») et conducteurs électroniques (dopés au niobium Nb ou à l’antimoine Sb). Le support permettant d’atteindre les meilleures propriétés électrocatalytiques est un aérogel de SnO₂ dopé à l’antimoine, noté ATO. En particulier, l’électrocatalyseur Pt/ATO présente une activité spécifique vis-à-vis de l’ORR supérieure à celle d’un électrocatalyseur Pt/carbone Vulcan® synthétisé dans les mêmes conditions, suggérant des interactions bénéfiques entre les nanoparticules de Pt et le support oxyde métallique (Strong Metal Support Interactions, SMSI).Des tests de durabilité simulant le fonctionnement d’une PEMFC en conditions automobile ont été effectués en électrolyte liquide à 80 °C sur ces deux électrocatalyseurs : cyclage entre 0,60 et 1,00 V vs l’électrode réversible à hydrogène (RHE) ou entre 1,00 et 1,50 V vs RHE. Le catalyseur Pt/ATO présente une durabilité accrue par rapport au catalyseur Pt/carbone Vulcan® de référence. Cependant, de nouveaux mécanismes de dégradation ont été mis en évidence dans cette étude : tout d’abord, l’élément dopant Sb est progressivement dissout au cours du vieillissement électrochimique, ce qui implique une perte de conductivité électronique. Cette perte est en partie liée à des incursions à bas potentiel, notamment durant les caractérisations électrochimiques. De plus, entre 5 000 et 10 000 cycles de vieillissement électrochimique (entre 0,60 et 1,00 V vs RHE ou entre 1,00 et 1,50 V vs RHE à 57 °C), le matériau support perd sa structure poreuse et forme un film amorphe peu conducteurConventional electrocatalysts used in proton exchange membrane fuel cells (PEMFC) are composed of platinum nanoparticles supported on high specific surface area carbon blacks. At the cathode side of the PEMFC, where the oxygen reduction reaction (ORR) occurs, the electrochemical potential can reach high values - especially during startup-shutdown operating conditions - resulting in irreversible degradation of the carbon support. A “material” solution consists of replacing the carbon with supports based on metal oxides. The latter have to be resistant to electrochemical corrosion, be electronic conductor and have a porous and nano-architectural structure (for the transport of reagents and products and the homogeneous distribution of the ionomer and platinum nanoparticles).In this work, we have developed and characterized electrocatalysts composed of platinum (Pt) nanoparticles based on tin dioxide (SnO2) and titanium dioxide (TiO2) with optimized textural (aerogel, nanofibres or loosetubes morphologies) and electron-conduction properties (doped with niobium Nb or antimony Sb). The best electrocatalytic properties are reached for an antimony-doped SnO2 aerogel support, denoted ATO. The Pt/ATO electrocatalyst has especially a higher specific activity for the ORR than a Pt/carbon Vulcan® electrocatalyst, synthesized in the same conditions, suggesting beneficial interactions between the Pt nanoparticles and the metal oxide support (Strong Metal Support Interactions SMSI).Durability tests simulating automotive operating conditions of a PEMFC were carried out in liquid electrolyte at 57 °C on these two electrocatalysts by cycling between 0.60 and 1.00 V vs the reversible hydrogen electrode (RHE) or between 1.00 and 1.50 V vs RHE. The Pt/ATO electrocatalyst has an increased stability compared to the reference Pt/carbon Vulcan® electrocatalyst. However, new degradation mechanisms were highlighted in this study: first, the doping element (Sb) is progressively dissolved during electrochemical ageing, which implies a loss of electronic conductivity. This loss is partly due to incursions at low potential, including during electrochemical characterizations. Moreover, between 5,000 and 10,000 cycles of the accelerated stress tests (between 0.60 and 1.00 V vs RHE or between 1.00 and 1.50 V vs RHE at 57 °C), the support loses its porous structure and forms a poorly conductive amorphous film
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Hsieh, Chien-Wen. "Formation of composite organic thin film transistors with one-dimensional nanomaterials." Thesis, University of Cambridge, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.609276.
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Williams, Carl Glenwood. "No Sleep 'til Minsky's: A One-Man Tribute to Burlesque and Vaudeville." Digital Commons @ East Tennessee State University, 2007. https://dc.etsu.edu/etd/2099.
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No Sleep '˜Til Minsky's is a one-man show paying tribute to early 20th century variety entertainment. The writing process began with research into the forms of vaudeville and burlesque, including films of period acts, study of autobiographies and biographies of burlesque performers, and study of historical scripts performed in the time period and stored at the Library of Congress.
The format of the show consists of a one-hour core script in which Lou Drake speaks of his life and career in burlesque. In addition to the core script, the structure is designed to allow more actors to participate in staging sketches described by Drake, as well as allowing external acts to splice their material into a performance.
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OLIVEIRA, PAULA CESARI BORGES B. DE. "FROM THE LEADER TILL PLUS-ONE: A STUDY ABOUT THE GROUP TIE." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2011. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=34466@1.
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COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIORPROGRAMA DE SUPORTE À PÓS-GRADUAÇÃO DE INSTS. DE ENSINO
Este trabalho tem como objetivo investigar os laços observados no coletivo, a partir das coordenadas sugeridas por Freud na análise dos fenômenos da massa. Freud aponta a premissa do líder como fundamento de qualquer agrupamento, elo primordial nas relações entre os membros da massa. O seu caráter, ao mesmo tempo, maleável e homogêneo se definiria a partir do sugestionamento feito pelo líder. A identificação é o conceito norteador neste processo, desde sua apreensão primitiva e coletiva - através do Pai da horda, até o seu desdobramento no complexo de Édipo. Essa dissertação pretende inquirir a função do cartel enquanto ferramenta para o tratamento dos efeitos de massa; e analisar o papel do mais-um como agente provocador da incompletude no grupo. Pra tanto, observaremos um estudo dos grupos clínicos da Associação Digaí-Maré que, inspirados no cartel, buscam a inclusão da singularidade no grupo, normalmente afeito ao universal. O trabalho do clínico nos grupos do Digaí-Maré aposta nas diretrizes do mais-um, tentando descompletar a pretensa união do grupo. Os casos analisados discutem a possibilidade de sustentação do laço pela diferença. A inserção do estranho no conjunto se apresentaria como alternativa para a conservação das singularidades, assegurando o espaço para o sintoma de cada um.
This study aims to investigate the ties notated in collective, started with the co-ordenates introduced by Freud in his analysis about the mass. The major premise of a pressing leader happened in any grouping. The leader induce the mass that introduce itself malleable by him. The identification is the essential concept since its origin apprehension with the horde s father till its development in the Oedipus. The cartel is an important instrument to treat the mass effects; and the plus-one is responsible to deflate the group. The groups of Digaí-Maré Association intent to include the singularity in the united that generally tends to universal. The psychoanalyst that works on Digaí-Maré Association supposes to be the plus-one that defly the mass effects. The pretend tie on group is with the insupportable difference that can interlace each member. The only possibility to conserve the uniqueness is to include the strange peculiarity that owns us.
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Mård, Birger. "Betydelseutvecklingen hos några svenska ord för känslor, från fornsvensk tid till idag." Thesis, Uppsala universitet, Institutionen för lingvistik och filologi, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-377226.
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Människors ständiga språkliga aktivitet leder i många fall till att de ord vi använder sakta men säkert får nya betydelser – en process vi kallar semantisk förändring. Genom att applicera vetenskapliga teorier om semantisk förändring tillsammans med konsultering i historiska ordböcker är det möjligt att få större insikt i ords historia och de förändringar som kan ha påverkat dem. Syftet med denna uppsats har varit att genomföra just en sådan undersökning. Materialet har bestått av substantiv- och adjektivformer av svenska ord för 8 olika känslor, vilka vidare har delats in i positiva och negativa känslor. Analysen utgår från Gustav Sterns teori om semantisk förändring och hämtar belägg från olika ordböcker, med ett källmaterial som sträcker sig från början av den fornsvenska perioden fram till idag. Resultaten visar att i stort sett alla orden har genomgått betydelseförändringar och att de flesta ord har genomgått flera förändringar. Inga märkbara skillnader verkar finnas mellan de positiva och de negativa känslorna eller substantiven och adjektiven, varken med avseende på frekvens eller typer av förändring. Det framgår också tydligt av resultaten att det är mycket svårt att med säkerhet fastställa exakt vilka betydelseförändringar som har ägt rum för orden utan detaljerad inläsning av källtexter.
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Pollard, William Nichols Jr. "Non-contact Temperature Measurement of Stainless Steel in a TIG Welding Process." Thesis, Virginia Tech, 2009. http://hdl.handle.net/10919/35433.
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The goal of this research was to design and test an experimental setup capable of performing a TIG welding process and acquiring temperature measurements near the weld with the use of an infrared spot sensor. The data collected can then be used to validate a computer simulation that models the exact same process. An experimental setup was built, and preliminary temperature data were collected. It was determined that infrared measurements taken at the arc contain excessive amounts of interfering radiation emanating from the welding zone. The optimal angle of orientation is normal to the weld line. In this way an infrared spot sensor can be focused on an area just down weld of the arc where the temperatures remain relatively high and thermal gradients, although still large, are at a minimum. Additional data were collected from thermocouples to validate the infrared sensor results and also to provide additional data that can be compared to a computer model. Sources of error were identified and recommendations were made as to how they can be avoided or minimized.Master of Science
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Webster, Jefferson Penn. "A comparative evaluation of the Trinity and the one-and-the-many in Van Til and Gunton." Theological Research Exchange Network (TREN) Access this title online, 2004. http://www.tren.com.
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Wang, Dapeng. "Electronic transport and potential applications of one-dimensional and two-dimensional granular nanotubes and metals." View abstract/electronic edition; access limited to Brown University users, 2008. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3318367.
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Grimmtorp, Linda. "Var brister det? : Personalens perspektiv på äldres upplevelser av ensamhet, oro och ångest på äldreboende." Thesis, Karlstads universitet, Fakulteten för humaniora och samhällsvetenskap (from 2013), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-35914.
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Syftet med studien har varit att få klarhet i vilka faktorer som påverkar personalens handlande i mötet med äldres upplevelser av ensamhet, oro och ångest inom äldreomsorgen. Studien är kvantitativ och en enkätundersökning har genomförts på omsorgsavdelningar med personal som arbetar på särskilt boende. Jag har varit intresserad av att studera hur personalen möter de äldres upplevelser samt om brister kan identifieras som påverkar personalens handlande gentemot äldres behov. Den här studien har sin utgångspunkt i Socialstyrelsens nationella enkätundersökning 2012. Socialstyrelsens undersökning visade höga siffror vad gäller äldres upplevelser av ensamhet, oro och ångest på särskilt boende, vilket jag valt att studera vidare kring. Urvalet i min studie har bestått av 50 omsorgspersonal varav 31 svarade på enkäten vilket gav en svarsfrekvens på 62 procent. Den teoretiska utgångspunkten för studien har varit analysmodell med faktorer som utgår från individuella och organisatoriska områden. Studien påvisar utifrån personalens perspektiv att äldre upplever oro och ångest i hög grad vilket personalen anser orsakas av känslor av ensamhet. Resultaten utifrån analysmodellen visar huvudsakligen brister inom organisatoriska områden som brist på tid, arbetssätt, resurser, mål och arbetsledning. Personalens individuella resurser såsom empati, engagemang och värderingar visar tillfredsställande resultat. Däremot personalens kompetens vad gäller bemötande och arbetsmetoder visar genomgående brister. Detta påvisas genom avsaknad av utveckling och mål på det personliga, arbetsmässiga samt utbildningsmässiga planet. De äldres sociala tillfredsställelse har i studien gett paradoxala svar angående deras behov av samtal, stöd och gemenskap. Å ena sidan anses de äldres sociala behov vara tillfredsställda. Å andra sidan anses de äldre inte kunna påverka sina känslor av ensamhet, oro och ångest då personalen hänvisar till brist på tid och kompetens.The purpose of this study was to ascertain the factors affecting employee behavior when meeting older people's experiences of loneliness, worry and anxiety in elderly care. The study is quantitative and a questionnaire survey has been conducted with staff working in elderly care. My scope has been based on the staff´s perspective to find out the situation of the elderly and needs from social satisfaction and the older people´s opportunities for meaningful conversations in retirement home. The study is based on the 2012 national survey, performed by the Swedish National Board of Health and Welfare (Socialstyrelsen). The survey is showing high numbers of older people`s experience of loneliness, worry and anxiety in retirement home, which I have chosen to study futher about. The sample of the study consisted of 50 care staff employees, 31 of which responded to the questionnaire giving a response rate of 62 percent. The theoretical starting point for the study is an analysis model with prepared factors. Factors based on individual and organizational areas acquired from the theory of the elderly care. The study demonstrates from the perspective of the staff members, that the elderly are experiencing a high grade of worry and anxiety, which is considered to be caused by feelings of loneliness. The results based on the analysis model shows mainly deficiencies in organizational areas such as lack of time, work methods, resources, goals and management. The employees individual resources such as empathy, commitment and values show satisfactory results. However the staff's competence in treatment and working consistently show deficiencies. This is demonstrated by the lack of development and aims at the personal, labor, and educational level. Older people's social satisfaction has in the study yielded paradoxical response regarding older people's need foriiconversation, support and fellowship. On the one hand the social needs of the elderly is considered to be satisfied. On the other hand, the elderly are considered not to be able to influence their feelings of loneliness, worry and anxiety as the staff refer to the lack of time and expertise.
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Ullerud, Catharina. "Utan ord - En granskning av Shaun Tans verk Ankomsten, ur ett visuellt semiotiskt perspektiv." Thesis, Malmö universitet, Fakulteten för kultur och samhälle (KS), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:mau:diva-23070.
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Detta arbete undersöker om det går att förklara varför bilder i Shaun Tans bok Ankomsten upplevs som obehagliga. Teorin i uppsatsen grundar sig till stor del på ”das unheimlich”, ett uttryck myntat av Freud och som i uppsatsen beskrivs som det kusliga. Andra teorier är kognitiv dissonans och hyperbol. För att analysera bilderna definieras frågor baserade på teorins grundpunkter. I resultatet visar det sig att nästan alla bilder är länkade till det kusliga, ibland i kombination med andra teorier. Det görs också analyser om huruvida objektens skala och proportioner kan ha en inverkan eller inte, baserat på ”grodperspektivet”. I analysen görs även några liknelser till propagandaposters från andra världskriget, vilket länkas till ”mentala triggers”. I slutsatsen konstateras det att arbetet kunde blivit utförligare om det under forskningen funnits fler anledningar till obehag som kan länkas till bilderna. Det fanns även ett problem med att förklara varför många upplever vissa saker som obehagliga och dessa fick refereras till fobier, även om detta inte helt stämmer, och upplevelserna egentligen kan beskrivas som rädslor. För vidare forskning föreslås fokusgrupper för att testa uppfattningar med en kvantitativ metod samt att analysera historien utifrån ett genusperspektiv där huvudrollen i stället hade varit en kvinna.This paper investigates if it is possible to explain why pictures in Shaun Tans book The Arrival are experienced as unpleasant. The theory of the essay is mainly based on "das unheimlich" coined by Freud and is in the essay described as “uncanny”. Other theories are based on cognitive dissonance and hyperbole. In order to analyse the images content, questions based on the basic points of the theories are defined. As a result, it turns out nearly all pictures are linked to uncanny, sometimes in combination with other theories. Analyses regarding if scale and proportions of objects can make an impact are also made, based on the "frog perspective". Some similarities between images in “The Arrival” and propaganda posters from World War II can be observed, which can be linked to mental triggers. In the discussions, it is made clear that the research could have developed further if more reasons for discomfort were investigated while observing the images. There was also a problem with explaining why many observers are experiencing some elements as unpleasant and these elements are in the paper referred to as phobias, even though this not quite accurate and should be referred to as fears. In order to carry on further research, focus groups are suggested to test perceptions with a quantitative method. Also, to look at the story from a gender perspective, and to see what would be different if the main character was a female.
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Eriksson, Åsa. "Boteformelns överlevnad från förkristen tid : magiska ord och handlingar mot vrickad och bruten fot." Thesis, University of Gävle, Ämnesavdelningen för religionsvetenskap, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-3713.
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Syftet med uppsatsen var att ta reda på hur trollformler kan överleva flera århundraden. Jag har studerat en formel som botar vrickning eller brott på ben och bygger på ett muntligt berättande. För vidare resultat har jag tagit med historiska skeenden för att kunna se vad som har påverkat dess överlevnad. Jag har även tittat på ritualerna och magin kring boteformeln. Dessutom ifrågasatte jag om besvärjelsen var en magisk eller en religiös handling. Då det finns likheter med andra traditioner som vi för vidare idag för att lättare förstå, t.ex. att man ska spotta tre gånger när en svart katt korsar vägen eller att inte lägga nycklarna på bordet eller att gå under en stege vilket betyder otur. Med hjälp av nedteckningar av boteformeln och andra efterforskningar inom området har jag kommit fram till ett gott resultat. Det sociala och kulturella ligger till grund för att besvärjelsen ska överleva. Vilket kryddas med ett hemlighetsmakeri kring botandet som fångar mångas intresse med sin spänning. Det är en tradition som är förankrad, vilket gör att trollformeln förs vidare.
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Johansson, Bergholtz Emil. "One-dimensional theory of the quantum Hall system." Doctoral thesis, Stockholms universitet, Fysikum, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-7545.
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The quantum Hall (QH) system---cold electrons in two dimensions in a perpendicular magnetic field---is a striking example of a system where unexpected phenomena emerge at low energies. The low-energy physics of this system is effectively one-dimensional due to the magnetic field. We identify an exactly solvable limit of this interacting many-body problem, and provide strong evidence that its solutions are adiabatically connected to the observed QH states in a similar manner as the free electron gas is related to real interacting fermions in a metal according to Landau's Fermi liquid theory. The solvable limit corresponds to the electron gas on a thin torus. Here the ground states are gapped periodic crystals and the fractionally charged excitations appear as domain walls between degenerate ground states. The fractal structure of the abelian Haldane-Halperin hierarchy is manifest for generic two-body interactions. By minimizing a local k+1-body interaction we obtain a representation of the non-abelian Read-Rezayi states, where the domain wall patterns encode the fusion rules of the underlying conformal field theory. We provide extensive analytical and numerical evidence that the Laughlin/Jain states are continuously connected to the exact solutions. For more general hierarchical states we exploit the intriguing connection to conformal field theory and construct wave functions that coincide with the exact ones in the solvable limit. If correct, this construction implies the adiabatic continuation of the pertinent states. We provide some numerical support for this scenario at the recently observed fraction 4/11. Non-QH phases are separated from the thin torus by a phase transition. At half-filling, this leads to a Luttinger liquid of neutral dipoles which provides an explicit microscopic example of how weakly interacting quasiparticles in a reduced (zero) magnetic field emerge at low energies. We argue that this is also smoothly connected to the bulk state.
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Matern, Katrin [Verfasser], Tim [Gutachter] Mansfeldt, and Georg [Gutachter] Bareth. "Chromium contamination associated with Chromite Ore Processing Residue (COPR) in the area of Kanpur, Uttar Pradesh, India / Katrin Matern ; Gutachter: Tim Mansfeldt, Georg Bareth." Köln : Universitäts- und Stadtbibliothek Köln, 2016. http://d-nb.info/1124587810/34.
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Poor, Kalhor Mahboubeh. "Étude DFT du mécanisme de formation du dimethyl carbonate à partir de CO2 et de CH3OH à l'aide de Me2Sn(OMe)2." Thesis, Lyon 1, 2009. http://www.theses.fr/2009LYO10325.
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Le dioxyde de carbone occupe une place particulière dans l'amplification anthropogénique de l'effet de serre. En particulier, son utilisation dans la synthèse de carbonates organiques à partir d'alcools constituerait une alternative à l'emploi actuel du phosgène ou du monoxyde de carbone. L'insertion de CO2 dans Sn-OCH3 liaison de dialkyldimethoxystannanes est reconnue comme la première étape pour la formation du carbonate de diméthyle (DMC) à partir du méthanol et CO2. L'identification des étapes ultérieures est cruciale pour améliorer l'activité et est encore l’objet de débats car les espèces étain ont la propension à l’oligomérisation. Nous avons utilisé des calculs basés sur la Théorie de la Fonctionnelle de la Densité pour donner un aperçu sur le mécanisme de réaction. L'insertion de CO2 est promue par l’interaction acide-base concertée de Lewis de CO2 avec l'étain et l'atome d'oxygène du ligand méthoxy. Le chemin principal de la réaction pour la formation de DMC est proposé selon un réarrangement intramoléculaire des espèces monomériques, Me2Sn[OC(O)OCH3]2. Le processus conduit à un transfert d'un groupe méthyle d'un carbonate de méthyle à l'autre via un anneau de 4 atomes ou 6 atomes formant un fragment Sn-CO3. Dans une deuxième étape, le méthanol réagit avec un intermédiaire et conduit à la formation de DMC et un complexe de trimère qui peut permettre la régénération des réactifs. Mais un complexe décanucléaire d’étain peut être aussi produit par une réaction latérale. Enfin, un cycle catalytique pour produire le DMC a pu être élaboré. Les calculs DFT sont en accord avec les données expérimentales et permettent une analyse comparative des chemins de réactionCarbon dioxide occupies a special place in the amplification of the anthropogenic greenhouse effect. In particular, its use in the synthesis of organic carbonates from alcohols, constitute an alternative to the current application of phosgene or carbon monoxide. The insertion of CO2 into the Sn-OCH3 bond of dialkyldimethoxystannanes is recognized as the first step to dimethyl carbonate (DMC) formation from methanol and carbon dioxide. The identification of the subsequent steps is crucial for activity improvements and is still under debate as the tin species have the propensity for oligomerization. We have used density functional theory calculations to provide insight into the reaction mechanism. The CO2 insertion into the Sn-OCH3 bond is promoted by the concerted Lewis acid-base interaction of CO2 with tin and the oxygen atom of the methoxy ligand. The major reaction pathway to DMC is proposed to occur via an intramolecular rearrangement of the monomeric species, Me2Sn[OC(O)OCH3]2. The process results in the transfer of a methyl group from one methyl carbonate to the other via a 4-membered or 6-membered ring forming the Sn-CO3 moiety. In a second stage, methanol reacts with one intermediate and leads to DMC formation and a trimer compound which may allow the regeneration of the reactant. Also a decanuclear tin complex is produced due to the lateral reaction. Finally a catalytic cycle for DMC production in methanol can be elaborated. DFT calculations are in agreement with the experimental data and allow a comparative analysis of reaction channels
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Anantaprayoon, Amata. "Project X : All-in-one WAF testing tool." Thesis, Linnéuniversitetet, Institutionen för datavetenskap och medieteknik (DM), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-97102.
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Web Application Firewall (WAF) is used to protect the Web application (web app). One of the advantages of having WAF is, it can detect possible attacks even if there is no validation implemented on the web app. But how can WAF protect the web app if WAF itself is vulnerable? In general, four testing methods are used to test WAF such as fuzzing, payload execution, bypassing, and footprinting. There are several open-source WAF testing tools but it appears that it only offers one or two testing methods. That means a tester is required to have multiple tools and learn how each tool works to be able to test WAF using all testing methods. This project aims to solve this difficulty by developing a WAF testing tool called ProjectX that offers all testing methods. ProjectX has been tested on a testing environment and the results show that it fulfilled its requirements. Moreover, ProjectX is available on Github for any developer who want to improve or add more functionality to it.
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Bergmann, Til Ole [Verfasser]. "Memory consolidation during sleep : on the function of neuronal oscillations in brain plasticity / Til Ole Bergmann." Kiel : Universitätsbibliothek Kiel, 2010. http://d-nb.info/1019984015/34.
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Tang, Poon Shun-lin Polly. "Relationship between dimensions and charateristics of family and school adjustment of form one students in Shatin." [Hong Kong : University of Hong Kong], 1992. http://sunzi.lib.hku.hk/hkuto/record.jsp?B13409463.
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Stenta, Aaron. "One Dimensional Approach to Modeling Damage Evolution in Galvanic Corrosion." University of Akron / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=akron1365808201.
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Trippe, Sascha. "Ten thousand stars and one black hole : a study of the galactic center in the near infrared /." Lichtenberg (Odw.) : Harland Media, 2008. http://deposit.d-nb.de/cgi-bin/dokserv?id=3104931&prov=M&dokv̲ar=1&doke̲xt=htm.
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Kvarnström, Daniel, and Amanda Mannervik. "ORD, TID & PENGAR : En kvalitativ studie av hinder och motsättningar i arbetsprocessen med forskningskommersialisering i högskolenära inkubatorer." Thesis, Mälardalens högskola, Akademin för innovation, design och teknik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-18272.
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Uppsatsens syfte är att undersöka vilka hinder och motsättningar som rådgivare och forskare upplever i forskningskommersialiseringsprocessen inom högskolenära inkubatorer. Studien bör ses som en förstudie för att i ett senare skede kunna skapa en effektiv innovationsprocessmodell för högskolenära inkubatorer. Uppsatsens frågeställningar har undersökts ur ett innovationstekniskt perspektiv med hjälp av teorier om bland annat inkubatorer, innovationsprocesser och akademiskt entreprenörskap. Resultatet visar att det finns ett antal kulturkrockar som medför risk för att rådgivare och forskare talar förbi varandra. Andra hinder och motsättningar i forskningskommersialiseringsprocessen är skillnader i språkbruk, forskarens multipla roller, uppfattningar om arbetstempo samt att matchningen mellan entreprenör och forskare är svårorganiserad och tidskrävande.This essay seeks to examine which obstacles and oppositions business coaches and researchersexperience in the research commercialization process in university business incubators. This studyshould be seen as a pre-study with the intention of contributing to later on building a newinnovation process model for university business incubators. Essay questions have been examinedfrom the perspective of innovation technology and are linked to theories about incubators,innovation processes and academic entrepreneurship. The result is that there is a number of culturalclashes that brings along a risk for misunderstandings between business coaches and researchers.Other obstacles and oppositions in the research commercialization process is differences inlinguistic use, the multiple roles of the researcher, interpretation of working pace and also that thematching between researcher and entrepreneur is time-consuming and hard to organize.
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Pantzar, Emma. "Analys hur de svenska politikprogrammen förändrats över tid : Ett långsiktigt perspektiv." Thesis, Karlstads universitet, Fakulteten för humaniora och samhällsvetenskap (from 2013), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-65988.
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Syftet med studien är att analysera förändringen i de svenska partiernas politiska program genom att tillämpa Public Choice skolans modeller. Med hjälp av medianväljarteoremet och Hotellingmodellen analyseras om modellerna är tillräckligt beskrivande för Sveriges partiförflyttningar. Vidare beräknas Herfindahl-Hirschman index för graden av maktkoncentration på den politiska ”marknaden”. Herfindahl-Hirschman indexet visar att koncentrationen på den politiska marknad blivit lägre över tid, viket indikerar på att konkurrensen mellan partierna blivit allt högre under perioden 1973-2014. För att analysera om det går att förklara förändringar i partiernas politik under perioden 1973-2014 tillämpas medianväljarteoremet. En diskussion kring testning av modellen görs samt en illustration hur medianväljarteoremet skulle kunna se ut för Sveriges partier. För att analysera om en endimensionell skala är beskrivande för de svenska partiernas förflyttningar har Hotellingmodellen tillämpats. Genom att illustrera dessa två modeller på Sveriges partier undersöks om modellerna ger en tillfredställande beskrivningar av förändringen i de svenska partiernas politiska program. Analysen ger vid handen att att Medianväljarmodellen inte förklarar förändringarna i partiernas politik på ett tillräckligt utförligt sätt. Hotellingmodellen kan bättre förklar både de svenska partiernas förflyttningar på vänster-högerskalan samt förändringar i partiernas politik. Utöver de nämnda modellerna konstateras att den enskilda faktor som är mest betydelsefull för hur partierna ändrat sina politiska program är partiernas beroende av väljarnas åsikter.The aim of the study is to analyze changes in the Swedish political parties programs by applying the Public Choice approach. With help from the median voter theorem and the Harold Hotelling model, the paper analyzes if these models are sufficiently descriptive of Swedens political parties movements. A Herfindahl-Hirschman index is constructed which shows changes in concentration of political power over time. The Herfindahl-Hirschman index shows that the degree of concentration in the Swedish political “market” has become lower over time, which indicates that the party competition has increased during the period 1973-2014. In order to analyze whether it is possible to explain changes in the parties’ policies during the period 1973-2014 the median voter theorem is applied. A discussion about how this model can be tested is done as well as an illustration of how the median voter theorem could look like for the parties in Sweden. To analyze whether a one-dimensional scale is descriptive of the movements of the Swedish parties, the Harold Hotelling model is also applied. By illustrating these two models on Swedens parties, the paper investigates whether these models provide a satisfactory descriptions of the change in the Swedish parties political programs. The analysis concludes that the median voter theorem does not explain the changes in the parties politics in a sufficiently detailed manner. It is revealed that the Harold Hotelling model provides a better description for both the Swedish parties movements at the left-right scale and for the changes in the parties politics. In addition to the models mentioned the factor that that is most important for how the parties changed their political programs is the parties’ dependence of the voters opinions.
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Ekberg, Johan, and Carl Rosén. "Social ångest och emotionsreglering hos ungdomar: Könsskillnader i prevalens samt i predicerande och modererande effekter av oro, ruminering och undantryckande över tid." Thesis, Örebro universitet, Institutionen för juridik, psykologi och socialt arbete, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-51053.
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Jax, Tim [Verfasser]. "A Rooted-Tree Based Derivation of ROW-Type Methods with Non-Exact Jacobian Entries for Index-One DAEs / Tim Jax." Wuppertal : Universitätsbibliothek Wuppertal, 2020. http://d-nb.info/1214389651/34.
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Hsiao, Ming-Siao. "Crystallization, Crystal Orientation and Morphology of Poly(Ethylene Oxide) Under One Dimensional Defect-Free Confinement on the Nanoscale." University of Akron / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=akron1247266725.
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Yao, Hepeng. "Strongly-correlated one-dimensional bosons in continuous and quasiperiodic potentials." Thesis, Institut polytechnique de Paris, 2020. http://www.theses.fr/2020IPPAX057.
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Dans cette thèse, nous étudions les propriétés des bosons unidimensionnels dans divers types de systèmes, en nous concentrant sur les transitions de phase ou les croisements entre différents régimes de dégénérescence quantique. En combinant la méthode de Monte Carlo quantique avec d'autres techniques standard telles que la diagonalisation exacte et l’ansatz de Bethe thermique, nous pouvons calculer le comportement des bosons à une dimension dans différents cas où les résultats font encore défaut. Tout d'abord, dans le cas de bosons continus piégés de manière harmonique, nous fournissons une caractérisation complète d'une quantité appelée contact de Tan. En calculant la fonction d'échelle universelle de cette quantité, nous identifions le comportement du contact dans différents régimes de dégénérescence pour les bosons 1D. Nous montrons que le contact présente un maximum en fonction de la température et qu’il s’agit d’une signature de la fermionisation du gaz dans le régime de forte interaction. Ensuite, nous étudions la localisation et les propriétés fractales des gaz idéaux 1D dans des potentiels quasi-périodiques peu profonds. Le système quasi-périodique constitue un intermédiaire intéressant entre les systèmes ordonnés à longue distance et les véritables systèmes désordonnés aux propriétés critiques inhabituelles. Alors que le modèle d'Aubry-André (AA) à liaison étroite a été largement étudié, le cas du réseau peu profond se comporte différemment. Nous déterminons les propriétés critiques de localisation du système, le potentiel critique, les bords de mobilité et les exposants critiques qui sont universels. De plus, nous calculons la dimension fractale du spectre d'énergie et nous constatons qu'elle est non universelle mais toujours inférieure à l'unité, ce qui montre que le spectre n'est dense nulle part. Enfin, nous passons à l'étude avec les interactions. Avec les calculs quantiques de Monte Carlo, nous calculons le diagramme de phase des bosons de Lieb-Liniger en potentiels quasi-périodiques peu profonds. On trouve un verre de Bose, entouré de phases superfluides et de Mott. À température finie, nous montrons que la fusion des lobes de Mott est caractéristique d'une structure fractale et constatons que le verre de Bose est robuste contre les fluctuations thermiques jusqu'à des températures accessibles dans les expériencesIn this thesis, we investigate the properties of one-dimensional bosons in various types of systems, focusing on the phase transitions or crossovers between different quantum degeneracy regimes. Combining quantum Monte Carlo with other standard techniques such as exact diagonalization and thermal Bethe ansatz, we can compute the behavior of 1D bosons in different cases where the results are still lacking. First, in the case of harmonically trapped continuous bosons, we provide a full characterization of a quantity called Tan's contact. By computing the universal scaling function of it, we identify the behavior of the contact in various regimes of degeneracy for 1D bosons. We show that the contact exhibits a maximum versus temperature and that it is a signature of the crossover to fermionization in the strongly-interacting regime. Secondly, we study the localization and fractal properties of 1D ideal gases in shallow quasiperiodic potentials. The quasiperiodic system provides an appealing intermediate between long-range ordered and genuine disordered systems with unusual critical properties. While the tight-binding Aubry-Andr'e (AA) model has been widely studied, the shallow lattice case behaves differently. We determine the critical localization properties of the system, the critical potential, mobility edges and critical exponents which are universal. Moreover, we calculate the fractal dimension of the energy spectrum and find it is non-universal but always smaller than unity, which shows the spectrum is nowhere dense. Finally, we move to the study of the interacting case. With the quantum Monte Carlo calculations, we compute the phase diagram of Lieb-Liniger bosons in shallow quasiperiodic potentials. A Bose glass, surrounded by superfluid and Mott phases, is found. At finite temperature, we show that the melting of the Mott lobes is characteristic of a fractal structure and find that the Bose glass is robust against thermal fluctuations up to temperatures accessible in experiments
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Shahbazian, Ashkan. "Simplified thermal and structural analysis methods for cold-formed thin-walled steel studs in wall panels exposed to fire from one side." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/simplified-thermal-and-structural-analysis-methods-for-coldformed-thinwalled-steel-studs-in-wall-panels-exposed-to-fire-from-one-side(6aec12ea-0d18-43a6-b594-0f7bc4adca1c).html.
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The advantages of cold-formed thin-walled steel studs are many and their applications in building constructions continue to grow. They are used as load-bearing members. An example is lightweight wall panel assemblies which consist of channel steel studs with gypsum plasterboard layers attached to the two flanges, often with interior insulation. At present, expensive fire tests or advanced numerical modelling methods are necessary in order to discover the fire resistance of such wall assemblies. For common practice this is not effective and a simplified method, suitable for use in daily design, is necessary. The aim of this research is to develop such simplified methods. The first main objective of this study is to develop a simple approach to calculate the temperature distributions in the steel section, in particular the temperatures on both the exposed and unexposed sides when the panel is exposed to fire exposure from one side. These two temperatures are the most influential factors in the fire resistance of this type of wall assembly. The proposed method calculates the average temperatures in the flanges of the steel section and assumes that the temperature in the web is linear. The proposed method is based on a simple heat balance analysis for a few nodes representing the key components of the wall panel. The thermal resistance of these nodes are obtained by the weighted average of thermal resistances in an effective width of the panel within which heat transfer in the panel width direction is assumed to occur. The proposed method has been extensively validated by comparison with numerical parametric studies. In order to calculate the ultimate capacity of steel studs, the traditional method is by using effective width. However, this method is now being questioned as it considers elements of section in isolation and does not consider interaction between the elements. In addition, this method is not appropriate to be extended to steel studs under fire conditions. The cross-section under fire conditions has non-uniform temperature distribution which results in the non-uniform distribution of mechanical properties. Using an effective width method to deal with this problem will require many assumptions whose accuracy is uncertain. Recently, the direct strength method (DSM) has been developed and its accuracy for ambient applications has been comprehensively validated. This method calculates cross-sectional plastic resistance and elastic critical loads for local, distortional and global buckling modes with the aid of simple computer programs. The elastic and plastic resistances are then combined to give the ultimate resistance of the structure using interaction equations. This method is suited to steel studs with non-uniform temperature distribution in the cross-section. The second main objective of this study is to extend the direct strength method for application to thin-walled steel studs having non-uniform elevated temperature distributions in the cross-section. It has been found that the DSM concept is applicable, but the interaction equations should be modified to allow for the effects of elevated temperature (non-uniform temperature distribution and changes in stress-strain relationships). Also the effects of thermal bowing should be included when calculating the plastic resistance and the elastic buckling loads of the cross-section. This research has proposed new interaction equations and has developed design tools. By comparing the results of the proposed method with validated Finite Element simulations over a very large range of parametric studies, the proposed method has been demonstrated to be valid. The validation studies include both standard and parametric fire exposures and are generally applicable.