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  • 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.
1

Active interrogation of highly enriched uranium /

Fairrow, Nannette Lea, January 2000 (has links)
Thesis (Ph. D.)--University of Texas at Austin, 2000. / Vita. Includes bibliographical references (leaves 117-123). Available also in a digital version from Dissertation Abstracts.
2

Radioxenon generation using highly enriched uranium /

Elliott, Anthony James. January 1900 (has links)
Thesis (M.S.)--Oregon State University, 2009. / Printout. Includes bibliographical references (leaves 105-107). Also available on the World Wide Web.
3

The role of Highly Enriched Uranium in South Africa’s nuclear diplomacy

Krelekrele, Thembela January 2021 (has links)
Masters of Commerce / Highly enriched uranium (HEU) is one of the most dangerous materials in the world, because it is a key ingredient in making a nuclear bomb. If a terrorist organisation can get HEU, it would be close to making a nuclear bomb. After South Africa disarmed its nuclear weapons, it kept HEU that was extracted from the nuclear bombs. The US tried to persuade South Africa to blend down its HEU into low enriched uranium (LEU) or give it up for safekeeping. However, South Africa refused to give it up. After a breach at Pelindaba, a national key point facility where South Africa stores its HEU, the US intensified its efforts to pressure South Africa to give its HEU up. It even promised incentives to South Africa should they agree to give it up, but South Africa refused. The US used the nuclear terrorism narrative to justify its initiative to eliminate vulnerable materials in the world. However, South Africa is yet to be swayed. This is odd since South Africa's refusal can negatively affect its credentials as a nuclear nonproliferation and disarmament champion and its image as a norm entrepreneur. The objective of the study was to understand the role played by HEU in South Africa's nuclear diplomacy. It was to explore HEU as a factor in the state's nuclear diplomacy and to understand the power of having HEU in nuclear negotiations, as well as what SA intends to do with its HEU. The study is framed theoretically by drawing on foreign policy theory, namely middle-power theory, and revisionism. It juxtaposed middle power, reformist, and revisionist positions with status quo foreign policy to analyse the role of HEU in South Africa's nuclear diplomacy. As a middle power with a moral high ground, South Africa hoped that it can affect change in the nuclear regime. However, when this did not occur its foreign policy shifted to a revisionist character that is discontent with the status quo in the nuclear regime. SA is dissatisfied with the current nuclear order and wants it revised towards liberal values such as equality and nondiscrimination. It views the current nuclear order as nuclear apartheid.
4

Modelagem dos parâmetros separativos de ultracentrífugas para enriquecimento de urânio através de modelos de redes neurais híbridas

CRUS, MARIA U. de L. 09 October 2014 (has links)
Made available in DSpace on 2014-10-09T12:49:59Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T14:01:54Z (GMT). No. of bitstreams: 1 10426.pdf: 5114704 bytes, checksum: f2e34599a45825529e31aaf79a169541 (MD5) / Dissertacao (Mestrado) / IPEN/D / Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
5

Analise de perigos em instalacoes de enriquecimento isotopico de uranio

LAURICELLA, CHRISTIANE M. 09 October 2014 (has links)
Made available in DSpace on 2014-10-09T12:25:33Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T14:02:38Z (GMT). No. of bitstreams: 1 06172.pdf: 5264843 bytes, checksum: a22f14e596334a88838be0798f8a00e9 (MD5) / Dissertacao (Mestrado) / IPEN/D / Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
6

Procedimento de fabricação de elementos combustíveis a base de dispersão com alta concentração de urânio / Fabrication procedures for manufacturing high uranium concentration dispersion fuel elements

SOUZA, JOSE A.B. de 09 October 2014 (has links)
Made available in DSpace on 2014-10-09T12:34:11Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T14:06:45Z (GMT). No. of bitstreams: 0 / Dissertação (Mestrado) / IPEN/D / Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
7

Análises neutrônica e termo-hidráulica de dispositivos para irradiação de alvos tipo LEU de UAlx-Al e U-Ni para produção de Mo-99 nos reatores IEA-R1 e RMB / Neutronic and thermal-hydraulic analysis of devices for irradiation of LEU targets type of UAlx-Al and U-Ni to production of 99Mo in reactor IEA-R1 and RMB

DOMINGOS, DOUGLAS B. 20 February 2015 (has links)
Submitted by Maria Eneide de Souza Araujo (mearaujo@ipen.br) on 2015-02-20T18:59:28Z No. of bitstreams: 0 / Made available in DSpace on 2015-02-20T18:59:28Z (GMT). No. of bitstreams: 0 / Tese (Doutorado em Tecnologia Nuclear) / IPEN/T / Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
8

Modelagem dos parâmetros separativos de ultracentrífugas para enriquecimento de urânio através de modelos de redes neurais híbridas

CRUS, MARIA U. de L. 09 October 2014 (has links)
Made available in DSpace on 2014-10-09T12:49:59Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T14:01:54Z (GMT). No. of bitstreams: 1 10426.pdf: 5114704 bytes, checksum: f2e34599a45825529e31aaf79a169541 (MD5) / Dissertacao (Mestrado) / IPEN/D / Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
9

Analise de perigos em instalacoes de enriquecimento isotopico de uranio

LAURICELLA, CHRISTIANE M. 09 October 2014 (has links)
Made available in DSpace on 2014-10-09T12:25:33Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T14:02:38Z (GMT). No. of bitstreams: 1 06172.pdf: 5264843 bytes, checksum: a22f14e596334a88838be0798f8a00e9 (MD5) / Dissertacao (Mestrado) / IPEN/D / Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
10

Procedimento de fabricação de elementos combustíveis a base de dispersão com alta concentração de urânio / Fabrication procedures for manufacturing high uranium concentration dispersion fuel elements

SOUZA, JOSE A.B. de 09 October 2014 (has links)
Made available in DSpace on 2014-10-09T12:34:11Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T14:06:45Z (GMT). No. of bitstreams: 0 / O IPEN-CNEN/SP desenvolveu e disponibilizou para produção rotineira a tecnologia de fabricação de elementos combustíveis tipo dispersão, para uso em reatores nucleares de pesquisas. O combustível fabricado no IPEN-CNEN/SP está limitado à concentração de urânio de 3,0gU/cm3, para dispersões a base de U3Si2-Al, e de 2,3gU/cm3, para dispersões a base de U3O8-Al. O aumento da concentração de urânio nas placas combustíveis possibilita aumentar a reatividade do núcleo do reator e a vida útil do combustível. É possível aumentar-se a concentração de urânio no combustível até o limite tecnológico de 4,8gU/cm3 para a dispersão U3Si2-Al, e de 3,2gU/cm3 para a dispersão U3O8-Al, as quais estão bem qualificadas ao redor do mundo. Este trabalho tem como objetivo desenvolver o processo de fabricação de ambos os combustíveis com alta concentração de urânio, redefinindo-se os procedimentos de fabricação atualmente adotados no Centro do Combustível Nuclear do IPEN-CNEN/SP. Com base nos resultados obtidos conclui-se que para atingir a concentração desejada devem ser feitas algumas alterações nos procedimentos já estabelecidos, tais como mudança no tamanho de partícula dos pós e mudança no processo de alimentação da matriz de compactação. Os estudos realizados mostraram que as placas combustíveis com alta concentração de urânio a base da dispersão U3Si2-Al com 4,8 gU/cm3 fabricadas atenderam às especificações vigentes. Contudo, apesar da subjetividade da análise, a aparência da microestrutura obtida no núcleo das placas combustíveis a base da dispersão U3O8-Al com 3,2 gU/cm3 não foi considerada satisfatória devido à aparência da distribuição de vazios. O novo procedimento de fabricação foi aplicado na produção de placas combustíveis de dispersão U3Si2-Al com 4,8 gU/cm3 com urânio enriquecido, as quais foram utilizadas na montagem do elemento combustível parcial IEA-228 para ser testado quanto ao desempenho sob irradiação no reator IEA-R1 do IPEN-CNEN/SP. Esses novos combustíveis têm potencial para serem utilizados no novo Reator Multipropósito Brasileiro RMB. / Dissertação (Mestrado) / IPEN/D / Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP

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