A identidade de Feynman : um caso especial

Orientador: Gustavo Adolfo Torres Fernandes da CostaDissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Fisica "Gleb Wataghin"Resumo: A Identidade de Feynman relaciona certos tipos de gráficos e caminhos fechados sobre uma rede quadrada. Inicialmente conjecturada por Feynman, esta relação é importante no cálculo da função de partição do Modelo de Ising dentro da chamada formulação combinatorial do modelo. Nesta tese um caso particular e não trivial desta identidade é investigado. Neste caso, a rede tem apenas um vértice e R arestas com todas as extremidades ligadas a ele. A existência da identidade neste caso é provada e alguns problemas até então em aberto sobre ele são resolvidosAbstract: Feynman identity relates certain types of graphs with closed paths over a squared lattice. Originally conjectured by Feynman, this identity is a important. element in the combinatorial formulation of the Ising Model and in the computation of the partition function of the model within this formulation. In this Thesis a particular but nontrivial case of the identity is investigated. In this case, the lattice has only one site and R edges linked to it. The existence of the identity in this case is proved and some open problems related with it are solvedMestradoFísicaMestre em Físic

Neonatal Seizures—Perspective in Low-and Middle-Income Countries

Neonatal seizures are the commonest neurological emergency and are associated with poor neurodevelopmental outcome. While they are generally difficult to diagnose and treat, they pose a significant clinical challenge for physicians in low- and middle-income countries (LMIC). They are mostly provoked seizures caused by an acute brain insult such as hypoxic–ischemic encephalopathy (HIE), ischemic stroke, intracranial hemorrhage, infections of the central nervous system, or acute metabolic disturbances. Early onset epilepsy syndromes are less common. Clinical diagnosis of seizures in the neonatal period are frequently inaccurate, as clinical manifestations are difficult to distinguish from nonseizure behavior. Additionally, a high proportion of seizures are electrographic-only without any clinical manifestations, making diagnosis with EEG or aEEG a necessity. Only focal clonic and focal tonic seizures can be diagnosed clinically with adequate diagnostic certainty. Prompt diagnosis and timely treatment are important, with evidence suggesting that early treatment improves the response to antiseizure medication. The vast majority of published studies are from high-income countries, making extrapolation to LMIC impossible, thus highlighting the urgent need for a better understanding of the etiologies, comorbidities, and drug trials evaluating safety and efficacy in LMIC. In this review paper, the authors present the latest data on etiology, diagnosis, classification, and guidelines for the management of neonates with the emphasis on low-resource settings

Feynman identity: A special case revisited

It is proved that a special case of Feynman identity is a consequence of the generalized Witt identity of some Lie algebra.73322123