The purpose of this thesis was to investigate the potential ability of nano-scale zerovalent iron (nZVI) to remediate multiple metal contaminants, specifically in the context of mine tailings. The project began by adopting techniques reported on by investigators researching the remediation effectiveness on metal contaminants of nZVI within the framework of civil engineering applications, such as groundwater treatment (Karabelli et al, 2008). This phase of the project saw the treatment of laboratory prepared samples of copper contaminated waters (at 10, 30, 50 and 100 ppm) by the addition of unstabilized nZVI. Results showed that all but the 100 ppm samples were effectively cleared of nearly all metal contamination following treatment additions of 1 mL nZVI to 50 mL of sample water. The second phase of the project sought to expand on this success by subjecting laboratory prepared water samples containing multiple metal contaminants to the same dose on nZVI. A collection of metal contaminants, known as the Arctic Suite, containing arsenic, cadmium, cobalt, chromium, nickel, lead and zinc, was made up as contaminated waters (at 1, 3, 5, and 10 ppm concentrations) and was tested for nZVI remediation. Results showed that only the 10 ppm samples were not effectively remediated and furthermore showed preferential treatment of arsenic, chromium and lead instead of an even distribution of treatment amongst all metal contaminants present. The final phase of the project saw the testing of contaminated waters produced from five mine tailings, acquired from separate sources, by the same dose of nZVI as in the first two phases of the project. Results showed that where contaminant metals were present some remediation effect did occur. However, an inability to produce highly contaminated leachates from the mine tailings meant that no trends in nZVI remediation effectiveness could be determined with any certainty. / Thesis (Master, Mining Engineering) -- Queen's University, 2011-09-01 11:04:28.869

In this thesis we follow two directions: Zero Knowledge Protocols and the Discrete Logarithm Problem. In each direction we present the necessary background and we give a new approach for some parts of the existing protocols. / The new parts are dedicated to the soundness property of the Schnorr Identification Scheme and to the security of the sum+-Protocol. Since both directions are very well-known and studied in the field of cryptography, they are presented with many details so that the new results are easy to follow. / In writing this thesis we have tried to present the material in a specific order and in a manner easy to read even by beginners in cryptography.

Thesis (Ph. D.)--University of Washington, 2006. / Vita. Includes bibliographical references (leaves 50-52).

Este trabalho analisa a cobertura do jornal Zero Hora sobre o impasse entre o governo do Rio Grande do Sul e as montadoras de automóveis Ford e General Motors, no período de 16/03/1999 a 03/05/1999. É um estudo que procura, através do referencial da hermenêutica de profundidade, demonstrar como é construída a ideologia no jornalismo do grupo RBS – maior conglomerado de mídia da região Sul do Brasil –, com base no conceito proposto por Thompson de “sentido a serviço do poder”. A minuciosa pesquisa possibilitou perceber não só o agendamento de Zero Hora no caso envolvendo o governo do Partido dos Trabalhadores (PT) e as montadoras, mas a construção ideológica empreendida pelo jornal, legitimando o discurso das montadoras e da oposição, e desqualificando os argumentos do governo. O discurso neoliberal de redução das atribuições do Estado, hegemônico nas páginas de Zero Hora durante a década de 90, é trocado – nos primeiros meses do governo petista – por um discurso fragmentado, oportunista e descontextualizado do pensamento keynesiano, defendendo o papel importante do Estado na geração de emprego e renda, como propulsor do desenvolvimento através de investimentos e outras políticas de incentivos capazes de gerar um círculo virtuoso na economia. A cobertura tendenciosa de Zero Hora se tornaria um dos elementos constitutivos de um Cenário de Representação da Política (CR-P) desfavorável à candidatura petista na eleição para o governo do Rio Grande do Sul em 2002.

Este trabalho analisa a cobertura do jornal Zero Hora sobre o impasse entre o governo do Rio Grande do Sul e as montadoras de automóveis Ford e General Motors, no período de 16/03/1999 a 03/05/1999. É um estudo que procura, através do referencial da hermenêutica de profundidade, demonstrar como é construída a ideologia no jornalismo do grupo RBS – maior conglomerado de mídia da região Sul do Brasil –, com base no conceito proposto por Thompson de “sentido a serviço do poder”. A minuciosa pesquisa possibilitou perceber não só o agendamento de Zero Hora no caso envolvendo o governo do Partido dos Trabalhadores (PT) e as montadoras, mas a construção ideológica empreendida pelo jornal, legitimando o discurso das montadoras e da oposição, e desqualificando os argumentos do governo. O discurso neoliberal de redução das atribuições do Estado, hegemônico nas páginas de Zero Hora durante a década de 90, é trocado – nos primeiros meses do governo petista – por um discurso fragmentado, oportunista e descontextualizado do pensamento keynesiano, defendendo o papel importante do Estado na geração de emprego e renda, como propulsor do desenvolvimento através de investimentos e outras políticas de incentivos capazes de gerar um círculo virtuoso na economia. A cobertura tendenciosa de Zero Hora se tornaria um dos elementos constitutivos de um Cenário de Representação da Política (CR-P) desfavorável à candidatura petista na eleição para o governo do Rio Grande do Sul em 2002.

Este trabalho analisa a cobertura do jornal Zero Hora sobre o impasse entre o governo do Rio Grande do Sul e as montadoras de automóveis Ford e General Motors, no período de 16/03/1999 a 03/05/1999. É um estudo que procura, através do referencial da hermenêutica de profundidade, demonstrar como é construída a ideologia no jornalismo do grupo RBS – maior conglomerado de mídia da região Sul do Brasil –, com base no conceito proposto por Thompson de “sentido a serviço do poder”. A minuciosa pesquisa possibilitou perceber não só o agendamento de Zero Hora no caso envolvendo o governo do Partido dos Trabalhadores (PT) e as montadoras, mas a construção ideológica empreendida pelo jornal, legitimando o discurso das montadoras e da oposição, e desqualificando os argumentos do governo. O discurso neoliberal de redução das atribuições do Estado, hegemônico nas páginas de Zero Hora durante a década de 90, é trocado – nos primeiros meses do governo petista – por um discurso fragmentado, oportunista e descontextualizado do pensamento keynesiano, defendendo o papel importante do Estado na geração de emprego e renda, como propulsor do desenvolvimento através de investimentos e outras políticas de incentivos capazes de gerar um círculo virtuoso na economia. A cobertura tendenciosa de Zero Hora se tornaria um dos elementos constitutivos de um Cenário de Representação da Política (CR-P) desfavorável à candidatura petista na eleição para o governo do Rio Grande do Sul em 2002.

Das Ziel dieser Arbeit ist einerseits die Erfassung der Durchführung von Einzelfaserzugversuchen und ihren Ergebnissen, welche bis dato in der Literatur beschrieben wurden. Andererseits sollen eigene Untersuchungen durchgeführt werden, um eine Grundlage zur Entwicklung eines Messverfahrens von Kartoneinzelfasern zu schaffen. Dafür wurden unter Beachtung aktuell geltender Normen sowie auf Basis von Erfahrungswerten Zero-Span-Zugversuche durchgeführt und die Messdaten sowie Bruchbilder analysiert. Die Auswertung hat gezeigt, dass sowohl die Einspannlänge von 0,0 mm eingehalten als auch die Faserlaufrichtung beachtet werden muss. Weiterhin konnte die Breite des eingespannten Materials als Parameter identifiziert werden. Die Ergebnisse haben zum einen die Angaben der Literatur bestätigt und zum anderen neue Forschungsaspekte aufgezeigt, die in weiterführenden Untersuchungen überprüft werden können.:1 Einleitung 2 Stand der Wissenschaft 2.1 Material – Karton 2.2 Die Kartonfaser im Netzwerk 2.2.1 Aufbau einer Kartonfaser 2.2.2 Einflussfaktoren auf dem Weg ins Fasernetzwerk 2.3 Zugversuch 2.3.1 Einzelfaserzugversuch - Einzelne Fasern 2.3.2 Einzelfaserzugversuch - Zero-Span 2.3.3 Zugversuch mit zusätzlichen Untersuchungs- und Auswertungsverfahren 3 Experimentelle Untersuchung 4 Auswertung 4.1 Einfluss der Oberflächenbeschaffenheit der Einspannbacken 4.2 Einfluss der Einspannlänge 4.3 Einfluss der Beanspruchungsrichtung 4.4 Einfluss der Probenbreite 4.5 Bruchbildanalyse 5 Fazit und Ausblick

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<p> The work describes the preparation and properties of some novel dibenzylideneacetone complexes of palladium and platinum. The structure and bonding in these complexes is discussed in view of their infrared and nuclear magnetic resonance spectra. The cyclotrimerization of acetylenes by zero-valent nickel complexes is discussed and the synthesis of a new cyclobutadiene-platinum complex is reported.</p> / Thesis / Master of Science (MSc)

With current state-of-the-art privacy-preserving blockchain solutions, users can submit transactions to a blockchain while maintaining full anonymity and not leaking the contents of the transaction through cryptographic techniques like zero-knowledge proofs and homomorphic encryption. However, the architecture of a blockchain consists of a decentralized network where every network participant maintains their own local copy of the blockchain and updates it upon every added transaction. As a result, the volume of blockchain transactions and the timestamp of each blockchain transaction for an application is publicly available. This is problematic for applications with time-sensitive or volume-sensitive outcomes because users may want this information to be privatized, such as not leaking the lateness of student examinations. However, this is not possible with existing blockchain research. In this thesis, we propose a blockchain system for multi-party applications that does not leak any useful information from the volume and timing metadata of the application's transactions, including maintaining the privacy of a time-sensitive or volume-sensitive outcome. We achieve this by adding sufficient noise using indistinguishable decoy transactions such that an adversary cannot deduce which transactions actually impacted the outcome of the application. This is facilitated in a manner where anyone can publicly verify the application's execution to be correct, fair, and honest. We demonstrate and evaluate our approach by implementing a Dutch auction that supports decoy bid transactions on a private Ethereum blockchain network. / Master of Science / Blockchains are distributed, append-only, digital ledgers whose current state is continuously agreed upon through the consensus of network participants and not by any centralized party. These characteristics make them unique for many applications because they enable the application to be facilitated and executed in a public, verifiable, decentralized, and tamper-proof manner. For example, Bitcoin, the most popular cryptocurrency, uses blockchains to continuously maintain a permanent, verifiable ledger of payment transactions. However, one downside of this public architecture is that the volume of transactions and the timestamp of each transaction can always be publicly observed (e.g. the timestamp of every Bitcoin payment is public). This is problematic for applications with time-sensitive or volume-sensitive outcomes because users may want this volume and timing information to be privatized, such as not leaking the lateness of student examinations which could have severe consequences like violating student privacy laws. But currently with state-of-the-art blockchain research, privatizing this information is not possible. In this thesis, we demonstrate our approach that enables these time-sensitive and volume-sensitive applications to be implemented on blockchains in a manner that can maintain the privacy of these time-sensitive or volume-sensitive outcomes without sacrificing the application's integrity or verifiability. We then demonstrate and evaluate our approach through implementing a Dutch auction that supports decoy bid transactions on a private blockchain network.