Diss. (sammanfattning) Karlstad : Karlstads universitet, 2009. / S. 1-90: sammanfattning. Härtill 3 uppsatser.

Thesis (Ph. D.)--State University of New York at Binghamton, Department of Sociology, 2009. / Includes bibliographical references.

Thesis (Ph. D.)--George Washington University, 2002. / Includes bibliographical references (leaves 311-336).

Thesis (Ph. D.)--Duke University, 2000. / Vita. Includes bibliographical references (leaves 85-88).

Thesis (Ph. D.)--University of Pittsburgh, 1989. / Includes bibliographical references (leaves 162-177).

Thesis (Ph. D.)--University of Georgia, 1988. / Includes bibliographical references (leaves 343-359).

Thesis (Ph. D.)--University of Wisconsin--Madison, 1966. / Typescript. Vita. Description based on print version record. Includes bibliographical references (leaves 204-207).

Syftet med denna kvantitativa studie var att undersöka om skillnad fanns bland tjänstemän inom stålindustrin avseende arbetstillfredsställelse i kön, ålder och anställningstid samt om interaktionseffekter fanns mellan de tre variablerna. Arbetstillfredsställelsen mättes genom en webbenkät i Google formulär utifrån utvalda dimensioner från mätinstrumentet Copenhagen Psychosocial Questionnaire 2 (COPSOQ 2). Dessa var arbetstillfredsställelsen med arbetet i helhet, ledningskvalitet, socialt stöd från överordnade, socialt stöd från kollegor samt social gemenskap. Enkäten skickades ut av HR-avdelningen via mail till alla 584 tjänstemän på stålverket, 321 av dessa valde att delta i undersökningen vilket motsvarar en svarsfrekvens på 55 %. I resultatet korrelerade alla dimensioner med varandra och slogs därför ihop till en variabel, total arbetstillfredsställelse. Ingen skillnad fanns i kön och ålder medan anställningstid visade signifikanta skillnader där arbetstillfredsställelsen sjunker ju längre man varit anställd. Inga signifikanta interaktionseffekter kunde urskiljas. / The purpose of this quantitative study was to examine differences in gender, age and period of employment in job satisfaction. The study also examined interaction effects between the three independent variables. The study was conducted on officials at a workplace in the steel industry in Sweden. A survey was constructed in Google forms based on five selected dimensions from Copenhagen Psychosocial Questionnaire 2 (COPSOQ 2) that measured job satisfaction. The dimensions were the overall job satisfaction with work, quality of leadership, social support from superiors, social support from colleagues and social relations. All 584 officials were invited to participate where 321 responded to the survey, which corresponds to a response rate of 55%. In the result, all dimensions were found to correlate with each other and were therefore combined into one variable, total job satisfaction. There was no significant difference in sex or age, while period of employment had a negative relationship with job satisfaction. No significant interaction effects could be distinguished.

Submitted by Joao Moura (joaosic@gmail.com) on 2009-06-30T19:59:09Z No. of bitstreams: 1 Tese_MFEE_JOAO SICHIERI_2007.pdf: 336631 bytes, checksum: dc4d29066af0bd6c7564db0c209c3eb2 (MD5) / Approved for entry into archive by Vitor Souza(vitor.souza@fgv.br) on 2009-07-07T14:50:25Z (GMT) No. of bitstreams: 1 Tese_MFEE_JOAO SICHIERI_2007.pdf: 336631 bytes, checksum: dc4d29066af0bd6c7564db0c209c3eb2 (MD5) / Made available in DSpace on 2009-07-07T14:51:00Z (GMT). No. of bitstreams: 1 Tese_MFEE_JOAO SICHIERI_2007.pdf: 336631 bytes, checksum: dc4d29066af0bd6c7564db0c209c3eb2 (MD5) Previous issue date: 2007-05-30 / Credit risk management has assumed increasing importance for the managers and directors of enterprises. Thus, different approaches aimed to measure the probability of default are under discussion nowadays. This paper evaluates models that have become more popular over the last 30 years in order forecast defaults or to provide information regarding to financial difficulties of enterprises. This paper will focus on the KMV model in order to estimate the probability of default, its methodology based on market value of the asset and its volatility and finally estimate the probability of default. Finally, to test the KMV model will be used a sample of global steel companies that have credit in Companhia Vale do Rio Doce (CVRD), which will allow us to make comparisons with the models presented in this work.

L’acier est produit aujourd’hui principalement en faisant appel à une technologie basée sur le procédé haut fourneau-convertisseur à l’oxygène, conduisant à trois types d’émissions principales: le gaz de haut fourneau (BFG), le gaz de cokerie (COG), et le gaz de convertisseur (BOFG). Dans le cadre du projet VALORCO, une analyse des possibilités de réduction des émissions carbonées, associée à une valorisation des émissions de la sidérurgie, a été réalisée. Une des voies étudiées est la production de composés d’intérêt industriel tel que méthanol, pouvant être produit par transformation chimique du CO et/ou CO2 contenus dans les émissions, associé à de l’hydrogène. L’objectif principal de ce travail de thèse consiste à évaluer les possibilités offertes par le procédé de perméation gazeuse, appliqué à la récupération sélective de ces composés dans les 3 types d’émissions. Dans un premier temps, un état de l’art des différents projets dédiés à la capture (CCS) et à la valorisation (CCU) des émissions dans l’industrie de l’acier est présenté, avec une attention particulière aux différentes technologies de séparation des gaz. Des mesures expérimentales de sélectivité et de perméance pour différentes conditions de température et de pression, réalisées sur banc dédié avec deux matériaux membranaires disponibles commercialement et sélectif à l’hydrogène (vitreux) et au CO2 (élastomère) ont permis une étude paramétrique systématique par simulation des performances de séparation du procédé appliqué au BFG, COG et BOFG. Une comparaison des procédés basés sur un seul ou plusieurs étages de perméation, y compris avec des boucles de recirculation, a ensuite été entreprise dans un environnement de type Process System Engineering (PSE, logiciel Aspen Plus). L’influence des paramètres opératoires (rapport de pression, température, taux de prélèvement) sur les performances de séparation a été réalisée, conduisant à une cartographie des compositions atteignables. La consommation énergétique et la surface membranaire nécessaires pour chaque configuration permettent au final une optimisation techno-économique du procédé, sur la base d’un modèle économique intégré aux conditions de simulation / Steel is produced today mainly in a blast furnace-oxygen converter process, leading to three main types of emissions: blast furnace gas (BFG), coke oven gas (COG), and converter gas (BOFG). In the framework of the VALORCO project, an analysis of the possibilities for reducing carbon emissions, combined with the valorization of emissions from the steel industry, was carried out. One of the routes studied is the production of compounds of industrial interest such as methanol, which can be produced by chemical transformation of the CO and / or CO2 contained in the emissions associated with hydrogen. The main objective of this thesis work is to evaluate the possibilities offered by the gas permeation process applied to the selective recovery of these compounds in the three types of emissions. Initially, a state of the art of the various projects dedicated to the capture (CCS) and the valorization (CCU) of the emissions in the steel industry is presented, with particular attention to the different gas separation technologies. Experimental measurements of selectivity and permeance for different temperature and pressure conditions, carried out on a dedicated bench with two commercially available membrane materials, one selective to hydrogen (glassy) and one to CO2 (rubbery), allowed a systematic parametric study by simulation of the separation performance of the process applied to the BFG, COG and BOFG. A comparison of the processes based on one or more permeation stages, including recirculation loops, was then undertaken in a Process System Engineering (PSE) environment (Aspen Plus software). The influence of the operating parameters (pressure ratio, temperature, stage cut) on the separation performance was evaluated, leading to a mapping of attainable compositions. The energy consumption and the membrane surface required for each configuration allow a techno-economic optimization of the process, on the basis of an economic model integrated to the simulation conditions