100 research outputs found
Surface characterisation and flotation behaviour of the platinum and palladium arsenide, telluride and sulphide mineral species
No full textIncludes bibliographical references (leaves 170-181).The Platreef is located in the northern limb of the Bushveld Complex of South Africa. This reef consists of a complex assemblage of rock types, with pyroxenites, serpentinites and calcsilicates being the most abundant. The predominant PGMs are the tellurides, arsenides, alloys and sulphides. The Pt and Pd tellurides contribute between 20-45% of the PGMs present in the Platreef ore followed by the alloys (26%), arsenides (21%) and sulphides (19%). Flotation is used in the processing of the Platreef ore to separate the siliceous gangue from the platinum group minerals (PGM) and base metal sulphides. The PGE arsenide and telluride minerals are considered to be slow floating when compared to other PGMs as there is evidence of them reporting to the tailings.This thesis aimed to investigate the flotation behaviour of these minerals and presents results which characterise the surface properties of synthetic cooperite (PtS), vysotskite (PdS), sperrylite (PtAS2), palladoarsenide (Pd2As), moncheite (PtPd(BiTe)2 and PtTe2) and merenskyite (PdPt(BiTe)2 and PdTe2) and attempts to relate the flotation behaviour of the various minerals to these characteristics
The role of complexing agents in the flotation of pentlandite-pyroxene mixtures
No full textBibliography: leaves 137-146.This study examines the role complexing agents play in pentlandite-pyroxene flotation and focuses on the surface chemistry and interaction between valuable and gangue minerals as well as the interaction of complexing agents and reagents (xanthate, copper sulphate) in the system at pH 9. Microflotation, zeta potential measurements, ToF-SIMS analyses (time of flight secondary ion mass spectrometry) and X-ray photoelectron spectroscopy (XPS) were used as tools in determining the extent of surface alteration
Hierarchical Bayesian Models to Assess Between- and Within-Batch Variability of Pathogen Contamination in Food
No full textISI Document Delivery No.: 906KUTimes Cited: 1Cited Reference Count: 43Commeau, Natalie Cornu, Marie Albert, Isabelle Denis, Jean-Baptiste Parent, EricAgence National de la Recherche (ANR) (France)We thank Marie-Laure Delignette-Muller for useful comments. This work was supported by a grant from the Agence National de la Recherche (ANR) (France), as a part of the Quant'HACCP project. We are grateful to the FBOs that answered our enquiry.WILEY-BLACKWELLMALDENParent, Eric] UMR 518 INRA MIA, F-75005 Paris, France. [Commeau, NatalieCornu, Marie] ANSES, Lab Securite Aliments, F-94706 Maisons Alfort, France. [Commeau, Natalie] AgroParisTech ENGREF, F-75732 Paris, France. [Albert, Isabelle] Unite Metarisk INRA, F-75005 Paris, France. [Denis, Jean-Baptiste] INRA Math & Informat Appl, F-78352 Jouy En Josas, France.Commeau, N (reprint author), UMR 518 INRA MIA, 16 Rue Claude Bernard, F-75005 Paris, [email protected] within-batch and between-batch variability is of major interest for risk assessors and risk managers in the context of microbiological contamination of food. For example, the ratio between the within-batch variability and the between-batch variability has a large impact on the results of a sampling plan. Here, we designed hierarchical Bayesian models to represent such variability. Compatible priors were built mathematically to obtain sound model comparisons. A numeric criterion is proposed to assess the contamination structure comparing the ability of the models to replicate grouped data at the batch level using a posterior predictive loss approach. Models were applied to two case studies: contamination by Listeria monocytogenes of pork breast used to produce diced bacon and contamination by the same microorganism on cold smoked salmon at the end of the process. In the first case study, a contamination structure clearly exists and is located at the batch level, that is, between batches variability is relatively strong, whereas in the second a structure also exists but is less marked
De la Méthode bleue à Maïté: Jean Iribarnégaray, pédagogue et compositeur
No full textJean Iribarnégaray, también conocido como Jean Iri (1897-1947), fue un pianista y un compositor dividido entre su pueblo natal de Saint-Palais y Sens (Yonne). Despues de recorrer su biografía y el catálogo de sus obras, se abordan dos aspectos de su actividad: el de pedagogo (autor particularmente de un Méthode bleue (Método azul) apreciado en su tiempo) y el de autor de una pequeña "ópera cómica vasca" titulada Maïte. Esta obra es considerada como la heredera lejana de las óperas vascas de la generación anterior y como la ilustración de la folklorización de la cultura vasca que se manifesta en la Exposición Internacional de Paris (1937) donde se presentó.Jean Iribarnégaray, Jean Iri izenez ere ezaguna (1897-1947), piano jole eta musikagilea, Donapaleu sorterriaren eta Yonne-ko Sens herriaren artean erdibiturik bizi izan zen. Iribarnégarayren biografia eta obren katalogoa ikustatu ondoren, haren jardueraren bi alderdi aztertzen dira bereziki: pedagogoarena -funtsean, Méthode bleue (Metodo urdina) bere garaian apreziatuaren egile gisa- eta Maïte "euskal opera komikoaren" egilearena. Obra hori aurreko belaunaldiaren euskal operen urruneko ondorengotzat hartu ohi da, bai eta euskal kulturaren folklorizazioaren erakusgaitzat ere, zeina agerian azaldu zen Parisko Nazioarteko Erakusketan (1937), bertan aurkeztu baitzen obra hori.Jean Iribarnégaray, dit Jean Iri (1897-1947), fut un pianiste et un compositeur partagé entre sa ville natale de Saint-Palais et Sens (Yonne). Après avoir reconstitué son parcours biographique et le catalogue de ses oeuvres, deux aspects de son activité sont abordés: ceux de pédagogue (auteur notamment d'une Méthode bleue appréciée en son temps) et d'auteur d'un petit "opéra-comique basque" intitulé Maïté. Cette oeuvre est envisagée comme l'héritière lointaine des opéras basques de la génération précédente et comme l'illustration de la folklorisation de la culture basque qui se manifeste à l'Exposition Internationale de Paris (1937) où elle est présentée.Jean Iribarnégaray, also known as Jean Iri (1897-1947), was a pianist and a composer who spent his time divided between his natal village of Saint - Palais and Sens (Yonne). After going through his biography and the catalogue of his works, two aspects of his activity are then approached: that of pedagogue (particularly as the author of a Méthode bleue (blue Method) that was very appreciated in his time) and that as author of a small "comic Basque opera" titled Maïte. This work is considered as the distant heir of the Basque operas from the previous generation and as the illustration of the folklorization of Basque culture that is expressed in the Paris International Exhibition (1937) where it was presented
Un tableau signé de Pierre Brébiette
No full textA painting signed by Pierre Brébiette.
The Service de Restauration of the Museums of France undertook, in 1993, the restoration of several paintings for an exhibit devoted to the work of Claude Vignon. Among these paintings was the Abduction of Proserpine by Pluto, which attracted the attention of one restorer because of stylistic differences with the other paintings. After the surface of the painting was cleaned, the signature of Pierre Brébiette, until then invisible, was discovered, identifying him as the unquestioned author of this work. This is the first known, signed painting by this artist, who, until recently, has been known solely as a drawer and engraver. Further, certain comparisons may be made between the script of the graphic works of Brébiette and this painting, the technical character of which would situate it in the early years of the 17th century.Cortet Odile, Coural Natalie, Haviland Catherine, Mallet Robert, Martin Elisabeth, Ravaux Jean-Pierre. Un tableau signé de Pierre Brébiette. In: Histoire de l'art, N°32, 1995. De la restauration à l’histoire de l'art. pp. 55-61
A Performance on the Rewards and Frustrations of Teaching
No full textThe need for an education has become a societal mainstay in America. The cornerstone to a good education are the teachers. Yet, according to TheAge.com, the number of teachers produced by colleges and universities will produce only 43 percent of the jobs needed by the year 2004. Through the prose. A Teacher Gives Up the Fight by Natalie Reis, Cypher in the Snow by Jean Todhunter, The Perks of Being a Wallflower by Stephan Chbowsky, the poetry Comments of a Frustrated High School Teacher and Western Civ 2000 by John Sheehan; and the drama The Joys of Teaching by an anonymous author, I explore the rewards and frustrations of teaching
Credit dynamics in a first passage time model with jumps
No full textThe payoff of many credit derivatives depends on the level of credit spreads. In particular, the payoff of credit derivatives with a leverage component is sensitive to jumps in the underlying credit spreads. In the framework of first passage time models we extend the model introduced in [Overbeck and Schmidt, 2005] to address these issues. In the extended a model, a credit quality process is driven by an Itô integral with respect to a Brownian motion with stochastic volatility. Using a representation of the credit quality process as a time-changed Brownian motion, we derive formulas for conditional default probabilities and credit spreads. An example for a volatility process is the square root of a Lévy-driven Ornstein-Uhlenbeck process. We show that jumps in the volatility translate into jumps in credit spreads. We examine the dynamics of the OS-model and the extended model and provide examples. --gap risk,credit spreads,credit dynamics,first passage time models,Lévy processes,general Ornstein-Uhlenbeck processes
Sartre, Beauvoir, and the Resistance: An Authentic or Compromising Commitment to the Cause?
No full textAfter France’s Liberation in 1945, Jean-Paul Sartre and Simone de Beauvoir were lauded as an influential couple who exemplified the Resistance movement. However, despite their contributions to the literary and philosophic resistance, their personal and professional lives were filled with ambiguous and compromising activities. Under the oppressive Vichy regime, the two philosophers were able to better formulate and promote their existentialist ideas though extreme wartime events. This paper will first briefly discuss the historical context of the two writers, the German occupation during World War II, and the Resistance. Second, this research will explore existentialist themes in a work from each author: Morts Sans Sepulture (1941) by Sartre, and Le Sang Des Autres (1945) by Beauvoir. The analysis will emphasize the inherent ambiguity which characterized the authors’ philosophies, writings, and even personal lives due to existentialism’s lack of an absolute moral compass
The Other Side of Silence: Using fiction to explore the resources and limitations in writing about women's lives
No full textThis dissertation consists of two distinct components: a creative manuscript, titled “The Other Side of Silence,” and an accompanying exegesis. Both pieces endeavour to answer key questions: What are the different ways fiction might be used to write about the life of a woman from the past? How might we write about such women, taking into account the constraints by which their stories have been forgotten, omitted or displaced? And what are the implications of foregrounding such silences in the writing and reading of narratives?
“The Other Side of Silence” tells the story of Alba, an Italian woman who, with her young family, is leaving her hometown of Salerno for Australia in 1952. The narrative focuses on Alba’s relationship with her mother, Serafina, who fears that Alba’s journey to Australia is motivated by a desire to distance herself from her past. Within this narrative I explore how each of these characters views and consequently deals with the past.
The exegesis discusses several texts that have influenced and inspired “The Other Side of Silence.” In reading contemporary texts about the lives of women in the past, I noted two distinct approaches in the ways women’s stories were written. Some writers use recuperative strategies that allow them to tell stories previously omitted from or distorted by historical discourse and dominant cultural ideologies. By contrast, other writers use poststructuralist narrative strategies to foreground the ways in which traditional realist narratives gloss over the gaps, contradictions and omissions in women’s stories. These alternative narratives indicate how revelation and closure in traditional realism can preclude the probing of some subtle and significant questions about narrating and making sense of women’s experiences. The exegesis examines the different ways writers have challenged and subsequently enlarged conventional notions of realist fiction to imagine and speculate on the possibilities for and limitations on narrative
Identifying School-Aged Children At-Risk to Develop an Eating Disorder
No full textCurrent research supports that school-based eating disorder prevention programs have yielded unsuccessful results. Hypotheses presented in chapter one suggest failure to implement effective prevention programs are related to problematic screening attempts and a lack of focus on targeting prevention at the primary level. Chapter two outlines a review of literature analyzing eating disorder identification, history, prevalence, assessment and existing prevention programs. Chapter three describes the present study, which uses an eating disorder assessment instrument to screen a consenting sample of forth through twelfth graders. Results, presented in chapter four, suggest (a) that a significant number of students could benefit for eating disorder prevention programming and (b) just as many young children are at-risk to develop an eating disorder as are older children. Implications and limitations of the study are presented in chapter five. Here the author additionally presents a theory-based eating disorder prevention program based on the research presented in chapter two and the capabilities of a school psychologist
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