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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the 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.
61

Ore Petrology and Alteration of the West Ansil Volcanic-hosted Massive Sulphide Deposit of the Noranda Mining Camp, Rouyn-Noranda, Quebec

Boucher, Stéphanie 18 February 2011 (has links)
The West Ansil deposit was the first Cu discovery in 25 years in the Noranda Central Camp. It has a combined indicated and inferred resource of ~1.2 Mt. Grades for the indicated resource are 3.4% Cu, 0.4% Zn, 1.4 g/t Au and 9.2 g/t Ag. The bulk of the resource is located in three massive sulphide lenses (Upper, Middle and Lower) that are entirely within the Rusty Ridge Formation above the Lewis exhalite. The mineralization in all three ore lenses consists of massive pyrrhotite + chalcopyrite + magnetite. Semi-massive sphalerite is restricted to the upper and lower parts of the Middle lens. Massive magnetite occurs at the center of the Upper and Middle lenses, where it replaces massive pyrrhotite. A striking feature of West Ansil is the presence of abundant colloform and nodular pyrite (+marcasite) in the massive sulphides. Late-stage replacement of massive pyrrhotite by colloform pyrite and marcasite, occurs mostly along the upper and lower contacts of the lenses.
62

Ore Petrology and Alteration of the West Ansil Volcanic-hosted Massive Sulphide Deposit of the Noranda Mining Camp, Rouyn-Noranda, Quebec

Boucher, Stéphanie 18 February 2011 (has links)
The West Ansil deposit was the first Cu discovery in 25 years in the Noranda Central Camp. It has a combined indicated and inferred resource of ~1.2 Mt. Grades for the indicated resource are 3.4% Cu, 0.4% Zn, 1.4 g/t Au and 9.2 g/t Ag. The bulk of the resource is located in three massive sulphide lenses (Upper, Middle and Lower) that are entirely within the Rusty Ridge Formation above the Lewis exhalite. The mineralization in all three ore lenses consists of massive pyrrhotite + chalcopyrite + magnetite. Semi-massive sphalerite is restricted to the upper and lower parts of the Middle lens. Massive magnetite occurs at the center of the Upper and Middle lenses, where it replaces massive pyrrhotite. A striking feature of West Ansil is the presence of abundant colloform and nodular pyrite (+marcasite) in the massive sulphides. Late-stage replacement of massive pyrrhotite by colloform pyrite and marcasite, occurs mostly along the upper and lower contacts of the lenses.
63

Ore Petrology and Alteration of the West Ansil Volcanic-hosted Massive Sulphide Deposit of the Noranda Mining Camp, Rouyn-Noranda, Quebec

Boucher, Stéphanie 18 February 2011 (has links)
The West Ansil deposit was the first Cu discovery in 25 years in the Noranda Central Camp. It has a combined indicated and inferred resource of ~1.2 Mt. Grades for the indicated resource are 3.4% Cu, 0.4% Zn, 1.4 g/t Au and 9.2 g/t Ag. The bulk of the resource is located in three massive sulphide lenses (Upper, Middle and Lower) that are entirely within the Rusty Ridge Formation above the Lewis exhalite. The mineralization in all three ore lenses consists of massive pyrrhotite + chalcopyrite + magnetite. Semi-massive sphalerite is restricted to the upper and lower parts of the Middle lens. Massive magnetite occurs at the center of the Upper and Middle lenses, where it replaces massive pyrrhotite. A striking feature of West Ansil is the presence of abundant colloform and nodular pyrite (+marcasite) in the massive sulphides. Late-stage replacement of massive pyrrhotite by colloform pyrite and marcasite, occurs mostly along the upper and lower contacts of the lenses.
64

Ore Petrology and Alteration of the West Ansil Volcanic-hosted Massive Sulphide Deposit of the Noranda Mining Camp, Rouyn-Noranda, Quebec

Boucher, Stéphanie January 2011 (has links)
The West Ansil deposit was the first Cu discovery in 25 years in the Noranda Central Camp. It has a combined indicated and inferred resource of ~1.2 Mt. Grades for the indicated resource are 3.4% Cu, 0.4% Zn, 1.4 g/t Au and 9.2 g/t Ag. The bulk of the resource is located in three massive sulphide lenses (Upper, Middle and Lower) that are entirely within the Rusty Ridge Formation above the Lewis exhalite. The mineralization in all three ore lenses consists of massive pyrrhotite + chalcopyrite + magnetite. Semi-massive sphalerite is restricted to the upper and lower parts of the Middle lens. Massive magnetite occurs at the center of the Upper and Middle lenses, where it replaces massive pyrrhotite. A striking feature of West Ansil is the presence of abundant colloform and nodular pyrite (+marcasite) in the massive sulphides. Late-stage replacement of massive pyrrhotite by colloform pyrite and marcasite, occurs mostly along the upper and lower contacts of the lenses.
65

An evaluation and discussion of a deposit insurance system: Should South Africa adopt such a system?

Khoza, Bongani Terrence January 2020 (has links)
Magister Legum - LLM / The research will evaluate and discuss the importance of Deposit Insurance Systems (DIS) and the necessity of having this system. Important to the evaluation is an analytical consideration of how the South African Reserve Bank (SARB), the National Treasury (NT) and other global financial bodies proposed the approach thereof. Insofar as most jurisdictions had already adopted the DIS as encouraged by the international financial institutions, the study shall determine whether it is plausible for South Africa to derive guidance in her approach taking into account the potential risks posed by the safety-net.
66

Contributions from Mafic Alkaline Magmas to the Bingham Porphyry Cu-Au-Mo Deposit, Utah, U.S.A.

Maughan, Daniel T. 06 July 2001 (has links)
The Bingham porphyry Cu-Au-Mo deposit, Utah, may only be world-class because of substantial contributions of sulfur and metals from mafic alkaline magma to an otherwise unremarkable calc-alkaline system. Volcanic mafic alkaline rocks in the district are enriched in Cr, Ni, and Ba as well as ore-related constituents of Cu, Au, platinum group elements (PGE) and S. The bulk of the volcanic section that is comagmatic with ore-related porphyries is dacitic to trachytic in composition, but has inherited the geochemical signature of high Cr, Ni, and Ba from magma mixing with the mafic alkaline rocks. The volcanic section that most closely correlates in time with ore-related porphyries is very heterogeneous containing clasts of scoriaceous latite, latitic minette and flows of melanephelinite, shoshonite and olivine latite in addition to the volumetrically dominant dacite/trachyte. Bingham ore-related porphyries show ample evidence of prior mixing with mafic alkaline magmas. Intrusive porphyries that have not been previously studied well have several chemical and mineralogical indications of magma mixing. These "mixed" lithologies include the hybrid quartz monzonite porphyry, biotite porphyry, and minette dikes. Even some of the more silicic latite and monzonite porphyries retain high Cr and Ba contents indicative of mixing and contain trace amounts of sapphire ( Magma mixing calculations suggest about 10% of the monzonitic/latitic ore-related magma may have been derived from mafic alkaline magma similar to the melanephelinite. If the original S content of the mafic magma was about 2000-4000 ppm, comparable to similar magmas, then the mafic magma may have been responsible for contributing more than half of the S and a significant portion of the Cu, Au, and PGE in the Bingham deposit.
67

Развитие системы страхования вкладов в обеспечении устойчивости функционирования банковской системы : магистерская диссертация / Development of a deposit insurance system in ensuring the sustainability of the banking system

Беляев, О. И., Belyaev, O. I. January 2019 (has links)
Выпускная квалификационная работа (магистерская диссертация) посвящена исследованию системы страхования вкладов. Предметом исследования выступает механизм функционирования системы страхования вкладов, со всеми его особенностями формирования, методиками и формулами расчета, а также механизм взаимодействия данной системы со смежными и взаимозависимыми областями, в частности самой банковской системой. Основной целью магистерской диссертации является разработка ключевых направлений и конкретных мероприятий по развитию системы страхования вкладов для обеспечения устойчивого функционирования российской банковской системы. В заключении обозначены рекомендации по совершенствованию методик формирования фонда Агентства страхования вкладов. / The final qualifying work (master's thesis) is devoted to the study of the deposit insurance system. The subject of the research is the mechanism of functioning of the deposit insurance system, with all its formation features, methods and calculation formulas, as well as the mechanism of interaction of this system with adjacent and interdependent areas, in particular, the banking system itself. The main purpose of the master's thesis is to develop key areas and specific measures for the development of a deposit insurance system to ensure the stable functioning of the Russian banking system. In the conclusion, the recommendations on the improvement of the methods of formation of the Deposit Insurance Agency fund are indicated.
68

The Ytterby mine - A historical review and an evaluation of its suggested spatial coupling to multiple sclerosis (MS)

Sjöberg, Susanne January 2012 (has links)
The Ytterby mine is located on Resarö island in the Stockholm archipelago. Mainly feldspars but also quartz were historically quarried in the mine, which is also the place of discovery of seven rare earth elements (REE). During the cold war era, the mine shaft was used as a diesel and jet fuel deposit for the Swedish Armed Forces. Recently, a spatial coupling between multiple sclerosis (MS), a chronic neurodegenerative disease in the central nervous system, prevalence and the quarry has been suggested. Previous studies show that adverse neurological health effects are associated with oral intake of REEs and there is support for a coupling between ionizing radiation and MS. The extent and character of health effects as a result of exposure to petroleum products are still debated. However, a substantial number of scientific reports support a coupling between neurodegenerative health effects and toxic constituents of jet fuels such as benzene, toluene, and n-hexane. My data show that a possible overrepresentation of MS patients within the Ytterby postal code area could be an indication of a spatial coupling between the mine and MS. Such a possible coupling could be associated with the REEs present in the local rocks, with the previous storage of diesel or jet fuel MC-77 in the mine and/or with zones of high natural radioactivity in the area. Water samples collected in 15 wells in the Ytterby village show traces of five REEs, i.e. scandium (Sc), yttrium (Y), lanthanum (La), neodymium (Nd) and samarium (Sm) and the majority of sample locations at low ground elevation show contamination of diesel which is the most recent fuel stored in the mine. Moreover, results from an analysis of a black substance leaking out of cracks in the mine corridors confirm that REEs are present in substantial concentrations in the local rocks and also appear to be mobile. This should be taken into account when considering a potential contamination of the local water supply. Measurements of natural radioactivity have also been made around the contours of the quarry and zones of high ionizing radiation have been identified. By using these zones of high ionizing radiation as a proxy for rare minerals containing rare earth elements, I further suggest that the REE occurrences are highly localized around the quarry and could be associated with, or remobilized by, younger faults.  My data show that a full investigation is warranted of a possible spatial coupling between neurological health issues, MS being one of them, and the mine.
69

Increasing Recycling through Container Deposit : A Fixed Effects analysis of the Swedish increase in Container Deposit September 2010

Thörnelöf, Ivar January 2016 (has links)
This thesis analyze the impact on recycling from the increase in the deposit on metal cans that took place in Sweden, September 2010. This is done by using a fixed effects model, fixed on municipality, month, and year. Additionally, the thesis investigates the response of different socioeconomic groups to this change by investigating the interaction between deposit and variables for the socioeconomic factors of interest. Interactions for income, education, immigration, environmental awareness, and population density are investigated. The results show that, on avarage, the recycling in each of the Swedish municipalities have increased by 24.739 units per month, this represents an elasticity of recycling with respect to container deposit of 0.04. The results further indicate that there is strong negative interaction between deposit and income, suggesting that as income increases, the individual will be less responsive to a change in deposit. Contrary to theory, the results indicate positive interaction between deposit and education, indicating that, as education increases the individual becomes more responsive to a change in deposit.
70

Evaluation of dry fly-ash particles causing difficult deposits for acoustic soot blowing of boilers

Cedervall, Arvid January 2016 (has links)
This thesis compares ash collected from different boilers cleaned using infrasound cleaning. The samples were evaluated from their physical properties, in an attempt to find connections between the difficulty to remove ash and its physical appearance. To get a deeper understanding of the mechanisms behind adhesion and fouling, and possibly explain results from the study of the ash samples, a literature review was carried out. The ash was also evaluated to see if any connections could be drawn between the physical properties of the ash and its fouling capabilities. A strong connection was found between ash density and its fouling capabilities. It was found that no dry ash with a density higher than 0.4 g/ml were difficult to remove with infrasound cleaning, and no ash with lower density was easy to remove. The ash density was calculated from a measurement of the weight of a certain volume of ash on a scale. Optical microscopy was used to study the ash samples, and gave an estimation of particle size, shape, and porosity. However, no clear connection could be observed with this method between the different samples and which were difficult to remove. The particle size for a few of the samples were also measured by a wet laser sieving method, and while it does give a good picture of particle size, the size was not found to be a useful prediction of the ash fouling behaviour. The exact mechanism giving rise to the density dependence need to be further investigated.

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