https://repositorio.ufu.br/handle/123456789/5166 2026-10-12T16:34:59Z https://repositorio.ufu.br/handle/123456789/50558 Title: Análise tomográfica de redes neurais aplicada a problemas quânticos de muitos corpos Abstract: The use of artificial neural networks to represent many-body quantum states has spar- ked great interest in recent years, offering a promising approach to addressing complex problems arising in this context. In this work, we propose a tomography of the weights of a neural network applied to the problem to obtain the ground state of 1D spin chains with neighbor interaction. One of the objectives is to understand how unsupervised machine learning methods can identify regimes in 1D spin chains, such as ferromagnetic, antifer- romagnetic, and frustrated regimes. Our work seeks to contribute to the understanding of how neural networks incorporate physical characteristics of physical models, such as entanglement, into their synaptic weights. 2026-02-05T00:00:00Z https://repositorio.ufu.br/handle/123456789/50527 Title: Memorial Descritivo para promoção à classe de professor titular da carreira de magistério superior 2026-09-18T00:00:00Z https://repositorio.ufu.br/handle/123456789/50453 Title: Aplicação da nanotecnologia teranóstica e da segurança radiológica em Física em Médica: perspectiva abrangente sobre nanopartículas de carbono obtidas por síntese verde 2026-08-07T00:00:00Z https://repositorio.ufu.br/handle/123456789/50445 Title: Revisão da literatura sobre a avaliação das doses e seus efeitos em exames de raios X e tomografia computadorizada abdominal em crianças Abstract: This study presents a literature review on the assessment of radiation doses from abdominal X-ray and computed tomography (CT) examinations in children, with an emphasis on their potential impacts on pediatric health and on optimization strategies aimed at reducing radiation exposure. The review showed that CT, although indispensable in cases requiring greater diagnostic detail, exposes pediatric patients to significantly higher radiation doses than conventional radiography. Given children’s greater vulnerability to ionizing radiation, practices based on the principles of justification and optimization are essential to mitigate potential risks. Technological advances, such as iterative reconstruction algorithms and automatic exposure control systems, have enabled substantial reductions in radiation exposure without compromising diagnostic image quality. In addition, the customization of protocols according to the child’s body size and age, together with educational initiatives such as “Image Gently,” has played a key role in raising awareness and training healthcare professionals. The findings of this study revealed variations in effective dose among the studies analyzed. For pediatric abdominal radiography, studies reported a mean effective dose of 34.6 µSv (0.0346 mSv). For pediatric abdominal CT examinations, a Brazilian study reported a mean effective dose of 4.35 mSv. In the international literature, typical values ranging from approximately 3.7 to 5.3 mSv have been reported for pediatric patients, depending mainly on age, patient size, and the imaging protocol employed. It is concluded that the implementation of optimized practices in pediatric radiology is essential to enhance patient safety while maintaining the diagnostic effectiveness of these examinations. 2026-08-06T00:00:00Z