Thesis (M.S.)--Missouri University of Science and Technology, 2008. / Vita. The entire thesis text is included in file. Title from title screen of thesis/dissertation PDF file (viewed May 9, 2008) Includes bibliographical references (p. 131-139).

Thesis (B.S.)--University of Missouri, School of Mines and Metallurgy, 1910. / The entire thesis text is included in file. Typescript. Illustrated by author. Title from title screen of thesis/dissertation PDF file (viewed March 17, 2009) Includes bibliographical references (p. 26).

Thesis (B.S.)--University of Missouri, School of Mines and Metallurgy, 1908. / The entire thesis text is included in file. Typescript. Illustrated by authors. R. E. Armstrong determined to be Richard Edward Armstrong and H. A. Johnson determined to be Horace Asahel Johnson from "Thirty-Seventh Annual Catalogue of the School of Mines and Metallurgy". Title from title screen of thesis/dissertation PDF file (viewed November 12, 2008) Includes bibliographical references (p. 31).

Thesis (B.S.)--University of Missouri, School of Mines and Metallurgy, 1905. / The entire thesis text is included in file. Typescript. Title from title screen of thesis/dissertation PDF file (viewed November 18, 2008)

Thesis (B.S.)--University of Missouri, School of Mines and Metallurgy, 1897. / The entire thesis text is included in file. Typescript. Illustrated by authors. Jno. Rogers determined to be John A. Rogers and G. W. Dean determined to be George Walter Dean from "Forty-First Annual Catalogue. School of Mines and Metallurgy, University of Missouri". Title from title screen of thesis/dissertation PDF file (viewed February 12, 2009)

Thesis (M.S.)--University of Wisconsin--Madison, 1965. / eContent provider-neutral record in process. Description based on print version record. Bibliography: l. 82-83.

Please read the abstract in the section, 00front, of this document (Role and responsibility of the author) / Dissertation (MEng)--University of Pretoria, 2008. / Materials Science and Metallurgical Engineering / unrestricted

A dissertation submitted to the faculty of Engineering and the Built Environment, University of Witwatersrand, Johannesburg, in fulfilment of the requirements for the degree of Master of Science in Engineering November 2018 / The aim of this study is to improve the flotation of non-sulphide PGM ores from the Mimosa Mine in the Great Dyke of Zimbabwe by evaluating a variety of collector reagents that have not been tested on such material before and applying a full factorial experimental design to investigate the effects of the main primary collector, co-collector and depressant on PGM recovery and grade. The mineralogical studies by XRD revealed that the non-sulphide PGM ore had substantial amounts of gangue material, comprising of 45% quartz, 21% chabazite and 33% of magnetite. The ICP-OES analysis showed that this particular non-sulphide PGM ore is a low-grade ore with an average 4E head assays of 2.37ppm. In the preliminary flotation stage, three reagent suites made up of (i) a collector, (ii) a co-collector and (iii) a depressant i.e. (SIBX, DTP, M98B); (SIBX, C7133, M98B) and (SIBX, AM810, M98B) respectively were tested. It was observed that (SIBX, AM810, M98B) reagent suite gave the best performance with respect to both recovery and grade of the PGM concentrate from the ore. Attempts were made to optimize the dosage levels of the 3 reagents. The optimization studies revealed that 78.5% Pt and 69.3% Pd can be recovered at grades of 17.90g/t Pt and 9.44g/t Pd respectively. This represents a significant upgrade for the roughing stage from the 1.42g/t Pt and 0.85g/t Pd in the feed. These results were obtained at optimized dosages of 86g/t SIBX and 80g/t AM810, with depressant M98B at 50g/t. The observations from the experiments indicated that recovery of PGEs was on the upward trend as the dosage of hydroxamate was increasing hence the effect of the hydroxamate co-collector was further tested at higher dosages while fixing SIBX at 100g/t. The experiments were carried out using 50g/t, 60g/t, 70g/t and 80g/t hydroxamate (AM810) with the depressant M98B at 50g/t. It was observed that the Pt recovery only increased slightly with increasing hydroxamate (AM810) dosage. / E.R. 2019

No description available.

Seminario para optar al grado de Ingeniero Comercial, Mención Administración / “Window dressing” es la práctica de modificar la composición de una cartera de inversión previo a la fecha del informe de ésta a los inversionistas. El estudio de este fenómeno es bastante reciente y muy limitado para Chile. En este trabajo se toman informes de cartera mensuales para 328 fondos mutuos entre enero del 2008 y diciembre del 2012, con esta información se procede a comparar el retorno de un portafolio hipotético basado en el informe presentado por las administradoras de fondo con el retorno efectivo que obtuvieron durante todos los meses del período de estudio. Se logra obtener evidencia preliminar de window dressing, donde se observa que un 6,65% de los fondos estudiados tienen una alta probabilidad de haber recurrido a esta práctica. Además, se puede ver que este comportamiento se ve incrementado en momentos de inestabilidad económica, lo que sería coherente con los incentivos de los administradores de fondos a ocultar sus errores a los inversionistas, para así evitar pérdidas en momentos de alta incertidumbre económica.