Thesis (Ph. D.)--Wisconsin. / Vita. Includes bibliographical references (leaves 63-70).

Thesis (M. Eng.)(Metallurgical)--University of Pretoria, 2005. / Includes summary. Includes bibliographical references. Available on the Internet via the World Wide Web.

Ball State University LibrariesLibrary services and resources for knowledge buildingMasters ThesesThere is no abstract available for this thesis.

Thesis (Ph. D.)--Ohio State University, 2005. / Title from first page of PDF file. Document formatted into pages; contains xiv, 218 p.; also includes graphics (some col.) Includes bibliographical references (p. 208-218). Available online via OhioLINK's ETD Center

Thesis (Ph. D.)--University of Wisconsin--Madison, 1967. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

In recent years, emissions of hydrogen cyanide from metallurgical operations have received renewed attention by legislative bodies, leading to the need for a reliable quantification method for HCN volatilisation. Subsequently, the purpose of this project, launched by Anglogold Ashanti Ltd. and in collaboration with MINTEK and the University of Pretoria, was to develop a prediction model for cyanide volatilisation from plant operations and tailings storage facilities in South Africa. The study was done in four stages, the first being a laboratory study of the equilibrium behaviour of hydrogen cyanide. Henry’s Law constant (kH) was determined at different solution cyanide concentrations, salinities and temperatures. A value for kH was established at 0.082 atm.L/mol, which was found to be independent on the solution cyanide concentration between 10 and 200 ppm cyanide. In addition, the effect of temperature on kH was found to be negligible at solution temperatures between 20 and 35ºC. It was also concluded that high salinities increase kH and promote volatilisation, but this effect was negligible at the typical salinity levels found in South African process water. The second stage entailed a detailed study of the mass transfer coefficient, KOL, for hydrogen cyanide from cyanide solutions and pulp mixtures, both in the laboratory and on-site. It followed from this investigation that the most important parameters affecting KOL are the HCN (aq) concentration in the liquid, the wind velocity across the solution or pulp surface, expressed in terms of a Roughness Reynolds number, Re*, and the moisture content, or solid to liquid ratio, of the pulp. Furthermore, it was concluded that KOL is highly sensitive to HCN (aq) concentrations at low concentrations, while it becomes rather insensitive to HCN (aq) at concentrations above 20 ppm HCN (aq) . The data generated by the laboratory and on-site test work was incorporated into the development of an empirical prediction model, based on the Roughness Reynolds number (Re*), moisture content (M), and aqueous cyanide concentration (HCN(aq) ) which may be described by the following equation: KOL= <font face="symbol">a</font> Re*b Mc HCN(aq)d + e The model coefficients were subsequently determined for application of the model to leach tanks, adsorption tanks, tailing storage facility surfaces and return water dams. The calculated model predictions for KOL were in excellent agreement with the measured test work data. Finally, the prediction model was validated at the leach and adsorption sections of a selected gold plant and a selected tailings storage facility. The model predicted that 9% of the cyanide lost in the leach and adsorption section could be attributed to HCN volatilisation. As for the tailings storage facility, the model assigned 63% of the cyanide lost from the tailings storage facility to HCN volatilisation, of which 95% occurred from the area on the tailings dam surface covered in a thin liquid film. It is recommended that the current methods available for the determination of HCN (aq) be further improved, due to the sensitivity of the model to the input value of the HCN (aq) concentration, in order to ensure that reliable predictions are made. It is also suggested that additional validation work be done in order to establish the generic applicability of the model to different sites. / Dissertation (MEng(Metallurgical))--University of Pretoria, 2007. / Materials Science and Metallurgical Engineering / unrestricted

Made available in DSpace on 2014-07-29T15:22:53Z (GMT). No. of bitstreams: 1 Dissertacao Gilcileia I de Deus.pdf: 680131 bytes, checksum: 958d56fb9e09864378759a6c369aa9c0 (MD5) Previous issue date: 2011-03-28 / Brazil is one of the world s largest producers of yellow passion fruit (Passiflora edulis), that are mainly consumed fresh or used to produce juice. Studies indicate the use of yellow passion fruit skin in jam, sweets, cereal bars, cereals, and cookies especially due to its soluble and insoluble fiber content. Other studies have shown that yellow passion fruit skin contains cyanogenic compounds that may prooke intoxication when ingested above the threshold dose. The present work aim to assess the effects of different drying temperatures on the physical and chemical properties and total content of cyanogenic compounds in yellow passion fruit skin. The fruits were purchased at Goiania´s market and their characterization included visual evaluation of the color, average weight and proportion skin:pulp. The skin was sanitized, triturated, dried at 30°C or 45°C or 60°C to produce flour, in three repetitions for each temperature. The flour obtained at each drying temperature, and a commercial brand of yellow passion fruit flour were analyzed as to moisture, water activity, pH, titratable acidity, and total content of cyanogenic compounds. Yellow skins presenting small green spots characterize ripening stage 6 and were observed in 35.00% of the fruits. Average fruit weight was 142.06±31.95 g, 56.51±11.92% corresponded to the skin and 42.88±11.86% to the pulp with seeds. The increase in temperature caused significant decrease in moisture, equilibrium moisture, and water activity. Titratable acidity and pH results did not show any trends in relation to temperature variation. Taking into consideration the results of the dry products, drying treatments at 30°C, 45°C, and 60°C reduced total content of cyanogenic compounds by 84.98%, 85.75%, and 95.41%, respectively. Yellow passion fruit flour dried at 60°C presented 51.39% less cyanogenic compounds than the commercial brand. All drying temperatures caused alterations in the physical and chemical properties of the final product, but the treatment at 60ºC provoked the highest reduction in total content of cyanogenic compounds. / O Brasil é um dos maiores produtores mundiais de maracujá amarelo (Passiflora edulis), utilizado principalmente para a fabricação de suco e o consumo in natura. Estudos indicam a utilização da casca de maracujá amarelo em geleias, doces, barras de cereais, cereais matinais e biscoitos, principalmente devido ao seu conteúdo de fibras solúveis e insolúveis. Contudo, outros estudos têm demonstrado que a casca de maracujá amarelo contém compostos cianogênicos que podem causar intoxicação quando ingeridos acima do seu nível de ingestão máxima recomendado. O objetivo deste trabalho foi avaliar os efeitos de diferentes temperaturas de secagem nas propriedades físicas, químicas e no teor de compostos cianogênicos totais em casca de maracujá amarelo. Foram utilizados frutos de maracujá amarelo adquiridos no mercado de Goiânia. A caracterização do fruto foi realizada por meio da avaliação visual da coloração, do peso médio e da proporção casca:polpa. As cascas foram higienizadas, trituradas, secas a 30°C, ou 45°C ou 60°C e moídas para a obtenção de farinhas, realizando-se três repetições de cada secagem. As cascas in natura, as farinhas obtidas e uma marca de farinha comercial foram analisadas quanto ao teor de umidade, atividade de água, pH, acidez titulável e teor de compostos cianogênicos totais. Cascas amareladas apresentando pequenas manchas verdes caracterizam o estádio de maturação grau 6 e foram observadas em 35,00% dos frutos. O peso médio dos frutos foi 142,06±31,95 g, sendo, em média 56,51±11,92% correspondentes à casca e 42,88±11,86% à polpa com sementes. O aumento da temperatura causou redução significativa das variáveis umidade, umidade de equilíbrio e atividade de água. Os resultados de pH e acidez titulável não mostraram tendência quanto à variação de temperatura. Considerando os valores obtidos em base seca, as secagens a 30°C, 45°C e 60°C promoveram reduções de 84,98%, 85,75% e 95,41% de compostos cianogênicos totais, respectivamente. A farinha de maracujá amarelo seca a 60°C apresentou 51,39% menos compostos cianogênicos totais do que a marca comercial. Todas as temperaturas de secagem promoveram alterações nas características físicas e químicas do produto final, mas a secagem a 60ºC foi a que produziu maior redução dos compostos cianogênicos totais.

High-resolution molecular spectroscopy has been used to study acetylene line parameters and emission spectra of hydrogen cyanide. All acetylene spectra were recorded in our laboratory at the University of Lethbridge using a 3-channel tuneable diode laser spectrometer. N2-broadened line widths and N2-pressure induced line shifts have been measured for transitions in the v1+v3 band of acetylene at seven temperatures in the range 213–333K to obtain the temperature dependences of broadening and shift coefficients. The Voigt and hard-collision line profile models were used to retrieve the line parameters. The line-broadening and line-shift coefficients as well as their temperature-dependent parameters have been also evaluated theoretically, in the frame work of a semi-classical approach based on an exponential representation of the scattering operator, an intermolecular potential composed of electrostatic quadrupole–quadrupole and pairwise atom–atom interactions as well as on exact trajectories driven by an effective isotropic potential. The experimental results for both N2-broadening and shifting show good agreement with the theoretical results. We have studied the line intensities of the 1νl20←0νl20 band system from the HCN emission spectrum. The infrared emission spectrum of H12C14N was measured at the Justus-Liebig University, Giessen, Germany. The emission spectrum was analyzed with the spectrum analysis software Symath running using Mathematica as a platform. This approach allowed us to retrieve information on band intensity parameters. / viii, 112 leaves : ill. ; 29 cm

Diss. (sammanfattning) Uppsala : Sveriges lantbruksuniv., 2007. / Härtill 5 uppsatser.

After World War II some people from all over Europe started to say that the destruction of the European Jews never happened. This article is written to compare the argument the Holocaust deniers are using against science document. The materials that have been used for this comparison are the books “Dog verkligen 6 miljoner? Sanning till sist” and ”En tom säck kan inte stå” which are the Holocaust deniers material. From the other side I have been using the Swedish states internet side Forum för levande historia, the site of Världens historia and the documentary of Auschwitz from BBC. The arguments will be studied from post fact theory specters, were I will compare the facts from the two sides and put them together. I will do that by look how the arguments from the two sides are built. I have also made questions that I have been asking by email the two sides. The Holocaust denier’s sides are the Swedish party called Nordiska Motståndsrörelsen (Nordic resistance movement) and the other side is Forum för levande historia (Forum of living history). The result that this study will show are when you put all the arguments from the Holocaust deniers together, their argument will not be as strong as when they are by them self.