• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 32
  • 13
  • 5
  • 4
  • 2
  • 2
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • Tagged with
  • 84
  • 43
  • 15
  • 13
  • 11
  • 11
  • 11
  • 10
  • 10
  • 9
  • 9
  • 9
  • 9
  • 8
  • 8
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
51

Identificação de assinaturas de urânio em amostras de esfregaços (swipe samples) para verificação de atividades nucleares para fins de salvaguardas nucleares / Identification of uranium signatures in swipe samples on verification of nuclear activities for nuclear safeguards purposes

Rafael Cardoso Baptistini Pestana 13 December 2013 (has links)
O uso das amostragens ambientais para fins de salvaguardas vêm sendo aplicadas pela Agência Internacional de Energia Atômica AIEA desde 1996 e estão sendo rotineiramente utilizadas como uma medida de fortalecimento complementar aos procedimentos tradicionais de salvaguardas de materiais nucleares. O intuito é verificar se os Estados signatários aos acordos de salvaguardas não estão divergindo suas atividades nucleares pacíficas para atividades nucleares não declaradas. O presente trabalho apresenta um novo protocolo de coleta e análise de esfregaços para identificação de assinaturas nucleares que possam relacionar-se com as atividades nucleares desenvolvidas na instalação inspecionada. Neste trabalho foi utilizada como estudo de caso uma planta real de reconversão de urânio do ciclo do combustível nuclear do IPEN. A estratégia analítica proposta utiliza diferentes técnicas, como medidor de radiação alfa, MEVEDS e ICPMS para identificar assinaturas do urânio aderido ao esfregaço. Na análise dos esfregaços, foi possível identificar partículas de UO2F2 e UF4 através da comparação morfológica e análises semi-quantitativas utilizando a técnica de MEVEDS. Nesse trabalho, utilizaram-se métodos que como resultado tem-se a composição isotópica média da amostra, onde o enriquecimento (fração atômica molar) variou de 1,453 ± 0,023% a 18,24 ± 0,15% no isótopo 235U. Através das coletas realizadas externamente, uma forma não intrusiva de amostragem, foi possível à identificação de atividades de manuseio de material enriquecido com medidas de fração atômica molar de 1,453 ± 0,023% a 6,331 ± 0,055% no isótopo 235U, bem como uso de material reprocessado, através da identificação do isótopo 236U. As incertezas obtidas neste trabalho para a razão n(235U)/n(238U) variaram de 0,40% a 1,68%. / The use of environmental samplings for safeguards purposes has been applied by the International Atomic Energy AgencyIAEA since 1996 and they are routinely used as a complementary measure to strengthen the traditional nuclear safeguards procedures. The aim is verify if the signatory states to the safeguards agreements are not diverging their peaceful nuclear activities to undeclared nuclear activities. This work describes a new protocol of collect and analysis of swipe samples in order to achieve identification of nuclear signatures, which may be related to the nuclear activities developed in the inspected facility. In this work, as a case of study, a real uranium reconversion plant of the nuclear fuel cycle of IPEN was used. The strategy proposed uses different analytical techniques, such as alpha radiation meter, SEM-EDX and ICP-QMS to identify signatures of the uranium adhered to the swipe samples. In the swipe samples analysis, it was possible to identify particles of UO2F2 and UF4 through the morphological comparison and semi-quantitative analysis performed by SEM-EDX technique. The methods used in this work bring the average isotopic composition of the sample as a result, in which the enrichment (molar atomic fraction) ranged from 1.453 ± 0.023% to 18.24 ± 0.15% in the 235U isotope. Through of the external collections, a non-intrusive sampling, it was possible to identify handling activities of enriched material with molar atomic fraction of 1.453 ± 0.023% to 6.331 ± 0.055% in the 235U isotope, as well as the use of reprocessed material by means of the 236U isotope identification. The uncertainties obtained in this work to the n(235U)/n(238U) ratio varied from 0.40% to 1.68%.
52

How small and medium sized enterprises (SMEs) can influence the successfulness of a partnership with a large company (LCO) in the technology innovation sector

Sawers, Jill Lynda 21 July 2007 (has links)
Small and medium sized enterprises (SMEs) are being seen by governments, increasingly, as important engines of economic growth. They are viewed as sources of innovation and employment creation. Technology innovative SME’s commercialization strategy often includes forming a partnership with a large company (LCO). This is because what the SME lacks in terms of market links, marketing and distribution channels, the LCO can often provide. LCOs, on the other hand, need to be innovative in order to survive in a dynamic and ever changing business environment. LCOs are therefore open to new ideas, being in the form of knowledge and capabilities. The reality is, however, that many partnerships fail. For an SME whose growth is dependant on a partnership with an LCO, understanding how it can influence the partnership such that it will result in success is critically important. This research sets out to gain a better understanding of this topic. Research Problem Technology innovative businesses operate in the knowledge economy where the one sure source of competitive advantage is knowledge (Takeuchi and Nonaka, 2004). However, knowledge is a high risk commodity and can be easily appropriated by an opportunistic company. A major risk in collaboration is that the partners can gain access to the knowledge and skills of the company (Littler et al, 1995) – this is termed knowledge spillover. Where this is unintentional, it can result in the company exposing its knowledge and skills being made very vulnerable. Furthermore, the high rate of partnership failure is attributed to a lack of cooperation and the opportunistic behaviour of partners (Das et al, 1998). It is important, therefore, for SMEs wishing to partner with an LCO, to understand both what attracts the LCO to partner with them in the first instance, as well as what safeguards need to be in place to protect themselves against possible opportunistic behaviour by the LCO. Methodology A sample of 43 technology innovative SMEs was interviewed by means of a structured questionnaire. The frequencies of the variables were analysed and compared with findings in the literature. In order to improve the variation of the dichotomous responses, the independent variables were compounded into the following variables: competencies, ability capabilities, awareness capabilities, formal safeguards and informal safeguards. The relationship between the number/level of competencies and capabilities and partnership success was determined, as well as the influence of formal and/or informal safeguards on this relationship. Backward conditional logistic regression was performed on the compounded variables in order to determine which model best fitted the data, in other words which predictors most affected partnership success. To better understand the negative relationship between ability capabilities and perceived partnership success, as well as the positive relationship between awareness capabilities and perceived partnership success, cross tabulations were performed on all the individual items to determine the Phi Square. An explanation was provided for those items that proved to be statistically significant. Because of the small sample used for this quantitative study and in order to verify the major findings, four case studies were conducted on SMEs that had participated in the original survey. The findings of the survey were then compared with the findings of the case studies. Main findings The main findings from the survey were the following: 1. SMEs’ abilities rather than their competencies, appeared to influence the success of the partnership 2. the more ability capabilities an SME had, the lower the perceived success of the partnership. This was influenced by where the SME had developed its own IP; and where the SME had segmented is potential market in accordance with Moore’s (1999) market segmentation strategy for hi-tech products 3. a positive relationship between awareness capability and partnership success was influenced by the SME having an understanding of the LCO’s SWOT, but this same relationship was negatively affected by the LCO preferring to enter into a JV with another LCO when sourcing technology 4. the relationships listed in items 2 and 3 above were influenced by safeguards, namely: 4.1 the greater the number of safeguards (formal and informal) that were put in place, the more positive will be the relationship between increasing numbers of awareness capabilities and the perceived success of the partnership 4.2 the greater the number of safeguards (formal and informal) that were put in place, the less negative will be the relationship between increasing numbers of ability capabilities, and the perceived success of the partnership 4.3 formal safeguards were more effective at moderating the relationship between capabilities and partnership success than informal safeguards The main findings from the case studies were as follows: 1. having ability capabilities, awareness capabilities and competencies was associated with high levels of partnership success (not in support of the survey findings) 2. above average levels of capabilities/competencies were associated with low levels of partnership success (in support of the survey findings) 3. there is a positive relationship between the level of safeguards and the association between capabilities/competencies and partnership success (in support of survey findings) 4. both formal and informal safeguards are important in ensuring a positive association between capabilities/competencies and partnership success (not in support of survey findings). In conclusion, the findings from the case studies did indeed validate some of the findings of the survey, namely, in the absence of safeguards, above average levels of capabilities/competencies are associated with low levels of partnership success; and there is a positive relationship between the level of safeguards and the association between capabilities/competencies and partnership success. / Thesis (PhD (Technology Management))--University of Pretoria, 2007. / Graduate School of Technology Management (GSTM) / PhD / unrestricted
53

Implementing effective trade remedy mechanisms : a critical analysis of Nigeria's Anti-Dumping and Countervailing Bill, 2010

Andrew, Ikeagwuchi Godwin January 2014 (has links)
Anti-dumping duties, safeguards and countervailing duties are collectively, within the context of the WTO, referred to as „trade remedies.‟ More specifically, the imposition of anti-dumping duties is a remedial measure for dealing with imports that cause or threatens to cause injury to local producers. Under the WTO framework, Article VI of the General Agreement on Tariffs and Trade 1994 and the Agreement on the Implementation of the General Agreement on Tariffs and Trade 1994 provides the rules for applying anti-dumping duties by member countries. Nigeria has been a member of the WTO since 1995 and can only apply anti-dumping duties provided it adheres to the rules governing anti-dumping. The purpose of this study is to ascertain whether the proposed Anti-dumping and Countervailing Bill, 2010 is consistent with WTO jurisprudence on anti-dumping. This study also highlights landmark developments in South Africa‟s anti-dumping system with a view to providing direction to Nigeria in order for its proposed national legislation on anti-dumping to be WTO compliant. / Dissertation (LLM)--University of Pretoria, 2014 / gm2015 / Centre for Human Rights / LLM / Unrestricted
54

Investigation of possible non-destructive assay (NDA) techniques for at the future Swedish encapsulation facility

Lundkvist, Niklas January 2012 (has links)
A geological repository for spent nuclear fuel (SNF) and an associated encapsulation facility will be built in Sweden.  The encapsulation facility is planned to be in operation in 2025 and it will be the last place where verifying safeguards measurements of SNF can be performed. It is not clear what types of measurements that will be performed, because such requirements are not yet posed by national and international authorities and inspecting organizations. This report describes the objective and most recent results of a master thesis project, whereby a few existing non-destructive assay techniques for verifying SNF are selected for a review. The study focuses on the verifying ability of different techniques, or system of techniques in relation to the requirement that may be put on the future encapsulation plant. In addition, possible needs for future simulations and measurements are discussed. The work is done as a collaboration between Uppsala University in Sweden and Los Alamos National Laboratory in the USA.
55

Fabrication and Characterization of a Molten Salt Application Silicon Carbide Alpha Detector

Jarrell, Joshua Taylor, Jarrell January 2018 (has links)
No description available.
56

Integrated Model Development for Safeguarding Pyroprocessing Facility

Zhou, Wentao 01 September 2017 (has links)
No description available.
57

Development of a dedicated hybrid K-edge densitometer for pyroprocessing safeguards measurements using Monte Carlo simulation models

Mickum, George S. 07 January 2016 (has links)
Pyroprocessing is an electrochemical method for recovering actinides from used nuclear fuel and recycling them into fresh nuclear fuel. It is posited herein that proposed safeguards approaches on pyroprocessing for nuclear material control and accountability face several challenges due to the unproven plutonium-curium inseparability argument and the limitations of neutron counters. Thus, the Hybrid K-Edge Densitometer is currently being investigated as an assay tool for the measurement of pyroprocessing materials in order to perform effective safeguards. This work details the development of a computational model created using the Monte Carlo N-Particle code to reproduce HKED assay of samples expected from the pyroprocesses. The model incorporates detailed geometrical dimensions of the Oak Ridge National Laboratory HKED system, realistic detector pulse height spectral responses, optimum computational efficiency, and optimization capabilities. The model has been validated on experimental data representative of samples from traditional reprocessing solutions and then extended to the sample matrices and actinide concentrations of pyroprocessing. Data analysis algorithms were created in order to account for unsimulated spectral characteristics and correct inaccuracies in the simulated results. The realistic assay results obtained with the model have provided insight into the extension of the HKED technique to pyroprocessing safeguards and reduced the calibration and validation efforts in support of that design study. Application of the model has allowed for a detailed determination of the volume of the sample being actively irradiated as well as provided a basis for determining the matrix effects from the pyroprocessing salts on the HKED assay spectra.
58

La convergence de la sécurité informatique et de la protection des renseignements personnels : vers une nouvelle approche juridique

Vicente, Ana Isabel 07 1900 (has links)
"Mémoire présenté à la Faculté des études supérieures en vue de l'obtention du grade de maîtrise en droit (LL.M.) option Nouvelles technologies de l'information" / Le développement exponentiel des réseaux informatiques a largement contribué à augmenter le volume des renseignements personnels disponibles et à remplacer les méthodes désuètes de collecte des renseignements par des méthodes plus rapides et plus efficaces. La vie privée et le contrôle sur les informations personnelles, telles que nous les connaissions il y a quelques décennies, sont des notions difficilement compatibles avec la société ouverte et commerciale comme la nôtre. Face à cette nouvelle réalité menaçante pour les droits et libertés de l'homme, il est essentiel de donner un cadre technique et légal stable qui garantisse un niveau de protection adéquat de ces données personnelles. Pour rester dans le marché ou bénéficier de la confiance des individus, les entreprises et les gouvernements doivent posséder une infrastructure de sécurité informatique efficace. Cette nouvelle donne a tendance à devenir plus qu'une simple règle de compétitivité, elle se transforme en une authentique obligation légale de protéger les données à caractère personnel par des mesures de sécurité adéquates et suffisantes. Ce mémoire aborde justement ces deux points: premièrement, l'étude du développement d'une obligation légale de sécurité et ensuite, l'encadrement juridique de la mise en place d'un programme de sécurisation des données personnelles par des mesures de sécurités qui respectent les standards minimaux imposés par les textes législatifs nationaux et internationaux. / The latest development in information networks largelly contributed to the increasing amount of personal data being collected by the public and private sector and the replacement of old fashioned collection methods by faster and cheaper techniques. Notions of privacy and control of personnal data are not as we used to know them a decade ago and they became somehow incompatible with an open and commercial society in which we live. Facing this new and dangerous reality to fondamental human rights and liberties, it is pressing to give a legal and technical stable framework insuring an adequate level of protection to personnal data. To keep a competitive position in the market and maintain individuals trust in the system, companies and governments must guarantee an efficent security infrastructure. If this feature was until now a strategie advantage, it has become an authentic legal obligation to protect personnal data by suffisant safeguards. The purpose of this work is essentially consider those two statements: the study of the development of a legal obligation to guarantee the security of personnal data and the legal backing for the implementation of a security policy respecting minimal standards imposed by national and international laws.
59

Desenvolvimento de metodologias utilizadas nas áreas de salvaguardas e forense nuclear baseadas na técnica LA-HR-ICP-MS / Development of methodologies used in Nuclear Safeguards and Nuclear Forensic based on LA-HR-ICP-MS technique

Marin, Rafael Coelho 14 November 2013 (has links)
A amostragem ambiental por esfregaço ou swipe samples é uma metodologia que vem sendo empregada rotineiramente pela Agência Internacional de Energia Atômica (AIEA) para verificar se os Estados signatários do Acordo de Salvaguardas estão realizando atividades nucleares não declaradas. A análise dessas amostras ambientais é complementar aos procedimentos de salvaguardas convencionais para a verificação das informações cedidas pelos Estados. Neste trabalho, foi descrita uma metodologia que visa a fortalecer os processos de salvaguarda nuclear e da ciência forense nuclear no país. A proposta é estudar e avaliar a técnica de ablação à laser acoplada a um espectrômetro de massa de alta resolução com fonte de plasma indutivamente acoplado (LA-HR-ICP-MS Laser Ablation High Resolution Inductively Coupled Plasma Mass Spectrometry), como técnica alternativa para a análise das amostras de esfregaço. Adicionalmente, foram empregadas outras técnicas complementares (atividade radioativa, microscopia eletrônica de varredura e espectroscopia de energia dispersiva) com o intuito de garantir maior segurança ao processo de inspeção de salvaguardas e investigações forenses nucleares. A precisão, medida através do desvio padrão relativo (DPR),dos resultados obtidos para as razões isotópicas 234U/238U, 235U/238U e 236U/238U do padrão analisado (CRM -125A) para a medida do fator de discriminação de massa foram, respectivamente, 1,3 %, 0,2 % e 7,6 %. Já as incertezas percentuais (u %), que também contemplam o DPR das medições, variaram de 3,5 % a 29,8 % para as medições da razão isotópica 235U/238U e de 16,6 % a 42,9 % para a razão isotópica 234U/238U. Esses valores mostraram-se compatíveis com outros estudos que utilizaram a mesma técnica para análise de amostras reais coletadas em uma instalação nuclear. As amostras coletadas apresentaram nível de enriquecimento que variou de (2,3 ± 0,7) % (amostra 3 corredor de acesso à instalação) a (17,3 ± 2,8) % (amostra 18 bancada de recuperação de UF4). A partir da coleta de amostras nesses diversos pontos, desde a entrada da instalação até a bancada em que se manuseia o urânio enriquecido, foi possível detectar diversos níveis de enriquecimento no isótopo 235U. / Environmental sampling performed by means of swipe samples is a methodology frequently employed by International Atomic Energy Agency (IAEA) to verify if the signatory States of the Safeguards Agreements are conducing unauthorized activities. Swipe samples analysis is complementary to the Safeguards ordinary procedures used to verify the information given by the States. In this work it was described a methodology intending to strengthen the nuclear safeguards and nuclear forensics procedures. The proposal is to study and evaluate the laser ablation high resolution inductively coupled plasma mass spectrometry (LA-HR-ICP-MS) technique as an alternative to analyze the real-life swipe samples. The precision achieved through the standard(CRM -125A)measurements, represented by the relative standard deviation (RSD), was respectively 1.3 %, 0.2 % e 7.6 %for the 234U/238U, 235U/238U e 236U/238Uisotopes ratios. The percent uncertainties (u %), which covers the RSD, ranged from 3.5 % to 29.8 % to the 235U/238U measurements and from 16.6 % to 42.9 % to the 234U/238U isotope ratio. These results were compatible with former studies performed by the LA-HR-ICP-MS that analyzed real-life swipe samples collected at a nuclear facility. Swipe samples collected from several points of the nuclear facility presented enrichment level ranging from (2.3 ± 0.7) % (sample 3) to (17.3 ± 2.8) % (sample18). They also allowed detecting different enrichment levels within the facility.
60

Consenso sobreposto rawlsiano: uma ponte entre o direito e a filosofia

Andrade, Analice Cabral Costa 11 July 2017 (has links)
Submitted by JOSIANE SANTOS DE OLIVEIRA (josianeso) on 2017-09-28T16:48:41Z No. of bitstreams: 1 Analice Cabral Costa Andrade_.pdf: 544151 bytes, checksum: 520fbd750df60e0c64804793014968c7 (MD5) / Made available in DSpace on 2017-09-28T16:48:41Z (GMT). No. of bitstreams: 1 Analice Cabral Costa Andrade_.pdf: 544151 bytes, checksum: 520fbd750df60e0c64804793014968c7 (MD5) Previous issue date: 2017-07-11 / Nenhuma / Essa dissertação se prende a analisar a teoria da justiça de John Rawls e seus conceitos de véu da ignorância, consenso sobreposto, justiça como equidade e contrato social, compreendendo qual o significado do direito das minorias e analisando a teoria da justiça de Rawls frente ao ordenamento atual de direito (direito geral), verificando a relação desta com o direito das minorias. Para o Direito, precisa-se proteger a minoria da possibilidade de discriminação. A importância, portanto, desse assunto é analisar os princípios jurídicos e os ideais filosóficos da teoria de justiça de John Rawls a fim de esclarecer a relação entre os direitos das maiorias( geral) e o direito das minorias e a aplicação do consenso sobreposto como meio de diminuir as diferenças que o direito quer instituir. / This dissertation relates to analyze the theory of justice of John Rawls and his concepts of veil of ignorance, overlapping consensus, justice as fairness and social contract, understanding the meaning of the rights of minorities and analyzing the theory of justice Rawls against the land current law (general right), verifying its relation to the rights of minorities. To the right, one must protect the minority of the possibility of discrimination. The importance, therefore this issue is to analyze the legal principles and philosophical ideals of John Rawls theory of justice in order to clarify the relationship between the rights of the majority (general) and the rights of minorities and the application of the overlapping consensus as a means to reduce the differences that the right wants to impose.

Page generated in 0.0373 seconds