Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 64 for “"HEU"”.
-
Maximum hypothetical accident analysis for HEU to LEU fuel conversion at the University of Missouri Research Reactor
… to convert from 93% highly-enriched uranium (HEU) aluminide dispersion fuel to 19.75% low-enrichment uranium (LEU) U-Mo monolithic fuel. Under chapter 13 of NUREG-1573, MURR must perform several safety analyses, one of which was the maximum hypothetical accident (MHA) analysis. For the …
-
Evaluation of the thermal-hydraulic operating limits of the HEU-LEU transition cores for the MIT Research Reactor
… study to convert from High Enrichment Uranium (HEU) fuel to Low Enrichment Uranium (LEU) fuel. The currently selected LEU fuel design contains 18 plates per element, compared to the existing HEU design of 15 plates per element. A transitional conversion strategy, which consists of replacing …
-
LEU-HEU Mixed Core Conversion Thermal-hydraulic Analysis and Coolant System Upgrade Assessment for the MIT Research Reactor
… 93%-enriched U-235 highly-enriched uranium (HEU) fuel to the low enriched uranium (LEU, <20%-enriched U-235) fuel, as part of the global non-proliferation initiatives. A high-density, monolithic uraniummolybdenum (U-10Mo) fuel matrix is chosen. The fuel element design is changed from 15-plate …
-
Influence of maternal human immunodeficiency virus (HIV) and antiretroviral (ARV) drugs on neonate neurometabolism.
… population of HIV-exposed and uninfected (HEU) infants and children, with the current global estimate of HEU infants and children at around 15 million. While results have been inconsistent, some studies show that HEU children have an increased risk of morbidity and mortality, as well as …
-
A comparative analysis of the medicine use and exposures in infants who are HIV exposed uninfected and HIV unexposed uninfected in the first year in Cape Town, South Africa
… in infants who are HIV-exposed uninfected (HEU), a growing population, remains poorly studied. This study aimed to describe and compare medication consumption patterns, including immunization coverage, between infants who are HEU and HIV-unexposed uninfected (HUU) during their first year of …
-
Association between infant feeding practices and infant growth by maternal HIV and antiretroviral therapy status: A prospective study in Cape Town, South Africa
… Infants who are HIV-Exposed Uninfected (HEU) may experience adverse growth outcomes compared to those who are HIV Unexposed Uninfected (HUU). Breastfeeding (BF) provides infants with the necessary nutrients to grow optimally irrespective of maternal HIV status. The initiation and duration …
-
The influence of HIV and ART exposure on neonate brain volumes
… increasing population of HIV-exposed-uninfected (HEU) infants and children. Despite improved outcomes compared to their peers living with HIV, HEU infants and children are at risk of neurodevelopmental delays in relation to HIV–unexposed–uninfected (HUU) children. As a result, there is a need to …
-
Limits on subcritical reactivity determination using rossi-alpha and related methods
… neutron decay constant measurements on a thermal HEU metal system. This system is designed to mimic a solution system and to have the optimal H/235U ratio to minimize the critical mass. The reactivity of these measurements varies between 0$ and 70$ below critical. In addition to experimental …
-
The Gut Mucosal Microbiome of HIV- exposed Uninfected Infants in Africa
… of the PMTCT program, HIVexposed-uninfected (HEU) infants represent a growing population in South Africa. However, these infants have been found to have increased morbidity and mortality rates compared to their HIV Unexposed Uninfected (HUU) peers, as well as altered immune and vaccine …
-
The association of maternal HIV status during pregnancy on longitudinal neuro-immune regulation, and neurodevelopment in HIV-exposed uninfected children
… outcomes in HIV-exposed uninfected (HEU) children are still largely unknown. Evidence from clinical studies showed that HEU children have an altered immune regulation compared to their unexposed counterparts, and this is hypothesised to play a role in neurodevelopmental outcomes in …
-
Estimate of radiation release from MIT reactor with low enriched uranium (LEU) core during maximum hypothetical accident
… from the use of highly enriched uranium (HEU) to low enriched uranium (LEU) for fuel. A component of the conversion analysis includes calculating the maximum hypothetical accident (MHA) dose implications for the two types of fuel. In this work, the dose levels at the site exclusion area …
-
The impact of maternal HIV infection on uninfected neonate brain structure
… increasing population of HIV-exposed uninfected (HEU) children. However, the long-term effects of HIV and antiretroviral therapy (ART) exposure on the developing brain is not well understood. While HEU children perform better than their counterparts living with HIV, they continue to demonstrate …
-
Exploring the gut microbiome: metaproteome analysis of HIV-exposed uninfected infants
… of HIV infected and unexposed infants (HEU) with unknown health implications. These infants have been observed to be more vulnerable to disease and have weaker immune responses. The gut microbiome plays a pivotal role in human health by aiding in metabolism, nutrient availability and …
-
Thermal-mechanical analysis of targets for high volume production of molybdenum-99 using low-enriched uranium
… countries and use highly enriched uranium (HEU). The University of Missouri Research Reactor (MURR) is exploring the feasibility of high volume molybdenum-99 production at its facility. Current molybdenum-99 production uses HEU in a powder dispersion target. The powder dispersion method, …
-
Nuclear non-proliferation regime effectiveness : an integrated methodology for analyzing highly enriched uranium production scenarios at gas centrifuge enrichment plants
… successfully producing Highly Enriched Uranium (HEU) at Gas Centrifuge Enrichment Plants (GCEPs) and (b) how effective is the current NPT regime in dealing with this issue. In order to tackle these two questions, an integrated methodology is used that reflects all factors affecting the nuclear …
-
Validation of the use of low enriched uranium as a replacement for highly enriched uranium in US submarine reactors
… US Navy has long used highly enriched uranium (HEU) in naval reactors for a variety of technical reasons. In a series of studies, the Department of Naval Reactors determined that switching to low enriched uranium (LEU) was impossible using current fuel designs, but may be possible with a …
-
Nuclear Electric Propulsion with Low Enriched Uranium
… fuel choice of highly enriched uranium (HEU). Using low enriched uranium (LEU, 20% U-235 by mass) avoids many of the security costs and public perception issues associated with HEU but has implications for the power system design. The core will require more fuel and/or a moderator, …
-
Early infant breastfeeding practices, and predictors of breastfeeding cessation, in HIV-uninfected and HIV-infected mothers on antiretroviral treatment: a prospective cohort study
… of both groups of women (HIV-exposed uninfected, HEU and HIV-unexposed, HU children), expressed as crude (HR) or adjusted hazard ratios (aHR). Results: Overall, 872 breastfeeding mother-infant pairs (HEU, n=461; HU, n=411) contributed 925 person-years of follow-up. All WLHIV initiated ART in …
-
Characteristics of and factors associated with infectious disease hospital admissions in children by HIV-exposure status in an era of high coverage of prevention of vertical HIV transmission in the Western Cape Province of South Africa
… age 15 years are exposed to HIV and uninfected (HEU). Since the implementation of lifelong antiretroviral therapy (ART) for all pregnant women living with HIV in 2013 (Option B+) and all individuals living with HIV in 2016 (Universal ART), the proportion of children conceived while their mothers …
-
Examination of the conversion of the U.S. submarine fleet from highly enriched uranium to low enriched uranium
… are currently fueled by highly enriched uranium (HEU), but HEU brings administrative and political challenges. This issue has been studied by the Navy before, and promising new fuel technology developments, combined with new motivations, warrant a fresh look at low enriched uranium (LEU). Evidence …
Page 1 of 4