Sample generation for the spin-fermion model using neural networks

Quantum Monte-Carlo simulations of hybrid quantum-classical models such as the double exchange Hamiltonian require calculating the density of states of the quantum degrees of freedom at every step. Unfortunately, the computational complexity of exact diagonalization grows $\mathcal{O} (N^3)$ as a function of the system's size $N$, making it prohibitively expensive for any realistic system. We consider leveraging data-driven methods, namely neural networks, to replace the exact diagonalization step in order to speed up sample generation. We explore a model that learns the free energy for each spin configuration and a second one that learns the Hamiltonian's eigenvalues. We implement data augmentation by taking advantage of the Hamiltonian's symmetries to artificially enlarge our training set and benchmark the different models by evaluating several thermodynamic quantities. While all models considered here perform exceedingly well in the one-dimensional case, only the neural network that outputs the eigenvalues is able to capture the right behavior in two dimensions. The simplicity of the architecture we use in conjunction with the model agnostic form of the neural networks can enable fast sample generation without the need of a researcher's intervention.Comment: 8 pages, 5 figure

A Statistic Method for Anatomical and Evolutionary Analysis

Rules, formulas, and statistical tests have been widely used in studies that analyze continuous variables with the normal (Gaussian) distribution or defined parameters. Nevertheless, in some studies such as those in gross anatomy, only statistics with discrete or nominal variables are available. In fact, the existence or absence of an anatomical structure, its features and internal aspects, innervation, arterial and vein supplies, etc. can be analyzed as discrete and/or nominal variables. However, there have been no adequate methods, which allow transformation of data with qualitative/nominal variables in gross anatomy to those with quantitative variables. To resolve the issue, we have purposed a new method that allows, in order, descriptions based on numerical analyses, the statistical method for comparative anatomy (SMCA), and proposed the formula for comparison of groups of anatomical structures among different species that allows to infer evolutionary perspective. The important features of this method are as follows: (1) to allow to analyze numerical data, which are converted from discrete or nominal variables in morphological areas and (2) to quantitatively compare identical structures within the same species and across different species. The SMCA fills the lack of a specific method for statistical works in comparative anatomy, morphology, in general, and evolutional correlations

Anatomical comparative study of shoulder and arm muscles of Cebus libidinosus

Propomos, neste trabalho, estudar os músculos do ombro e do braço de Cebus, comparados aos mesmos em chimpanzés, babuínos e humanos

P&D patentes, capacitação de recursos humanos e produtividade: notas sobre o caso brasileiro

The relationship between R&D, patents, human resource capability and productivity is widely discussed in the economic literature. The interaction between these areas is very important for economic analysis, as it is increasingly assumed to be the key issue in the role of technology in the production of the wealth of nations. This paper examines the correlation between these four sets of data in Brazil and represents only a preliminary stage in the investigation of the complex reldtionship between them. o' to The results show a strong correlation between R&D with patents and R&D with human resource capability. Productivity is correlated with only one topic of human resource capability: modern production methodsAs relações entre P&D, patentes, eoursos humanos e produtividade são amplamente dipgcutidas na' literatura. À interação desses quatro blocos é crucial pára a deter- minação da riqueza das nações, dado o peso da Htecnologia para O crescimento econômico.a Este artigo examina a correlação entre esses quatro conjunto de dados para o caso brasileiro. Representa um passo inicial na investigação dessas complexas interações. Os resultados apresentam uma correlação “forte entre P&D e patentes e entre P&D e capacitação de recursos humanos. A produtividade é correlacionada apénas com um tópico da capacitação de recursos humanos: métodos de gestão modernos

Reaction time decomposition as a tool to study subcortical ischemic vascular cognitive impairment

Background: The study of reaction time (RT) and its intraindividual variability (IIV) in aging, cognitive impairment, and dementia typically fails to investigate the processing stages that contribute to an overall response. Applying “mental chronometry” techniques makes it possible to separately assess the role of processing components during environmental interaction. Objective: To determine whether RT and IIV-decomposition techniques can shed light on the nature of underlying deficits in subcortical ischemic vascular cognitive impairment (VCI). Using a novel iPad task, we examined whether VCI deficits occur during both initiation and movement phases of a response, and whether they are equally reflected in both RT and IIV. Methods: Touch cancellation RT and its IIV were measured in a group of younger adults (n = 22), cognitively healthy older adults (n = 21), and patients with VCI (n = 21) using an iPad task. Results: Whereas cognitively healthy aging affected the speed (RT) of response initiation and movement but not its variability (IIV), VCI resulted in both slowed RT and increased IIV for both response phases. Furthermore, there were group differences with respect to response phase. Conclusion: These results indicate that IIV can be more sensitive than absolute RT in separating VCI from normal aging. Furthermore, compared to cognitively healthy aging, VCI was characterized by significant deficits in planning/initiating action as well as performing movements. Such deficits have important implications for real life actions such as driving safety, employment, and falls risk

ESTUDO ANATÔMICO DAS ARTÉRIAS DO OMBRO DE Cebus libidinosus (RYLANDS, 2000; PRIMATES – CEBIDAE)

As pesquisas nos Cebus libidinosus têm sido incremAs pesquisas nos Cebus libidinosus têm sido in¬crementadas, em razão do pouco conhecimento de sua morfofisiologia e por terem expressivo desenvolvimento psicomotor comparável ao dos primatas do Velho Mundo. A região do ombro merece especial atenção, em virtude dos hábitos arborícolas e as constantes manipulações de objetos. Neste trabalho utilizaram-se 24 exemplares de Cebus libidinosus doados pelo Instituto Brasileiro do Meio Ambiente (IBAMA) de Sete Lagoas, MG, Brasil, sacrificados de acordo com as recomendações do Comitê Brasileiro de Experimentação Animal (COBEA) e inclu¬ídos nas coleções anatômicas da Universidade Federal de Uberlândia (UFU) e Universidade Federal de Goiás (UFG). O sistema arterial destes indivíduos foi injetado com látex corado e posteriormente dissecaram-se as artérias sob lupa estereoscópica. Na maioria dos casos, as artérias encontra¬da, apresentaram relativa correspondência de distribuição e número comparável ao modelo humano e de outros primatas, com variações quanto à frequência e origem dos vasos. De modo geral as artérias do ombro deste Cebídeo se originaram de vasos derivados indiretamente da artéria axilar, uma vez que surgiram como pequenos troncos arte¬riais que se subdividiram, e não como ramos individuais, como descrito nos outros animais estudados, e de modo específico ocorreram variações de todas as estruturas em relação aos outros primatas estudados. PALAVRAS-CHAVES: Anatomia, artérias, Cebus libidinosus, primatas

Visual mismatch negativity to masked stimuli presented at very brief presentation rates

Mismatch Negativity (MMN) has been characterised as a ‘pre-attentive’ component of an event-related potential (ERP) that is related to discrimination and error prediction processes. The aim of the current experiment was to establish whether visual MMN could be recorded to briefly presented, backward and forward masked visual stimuli, given both below and above levels of subjective experience. Evidence of visual MMN elicitation in the absence of the ability to consciously report stimuli would provide strong evidence for the automaticity of the visual MMN mechanism. Using an oddball paradigm, two stimuli that differed in orientation from each other, an + and an x were presented on a computer screen. Electroencephalogram (EEG) was recorded from nine participants (six females), mean age 21.4 years. Results showed that for stimuli that were effectively masked at 7ms presentation, there was little variation in the ERPs evoked to standard and deviant stimuli or in the subtraction waveform employed to delineate the visual MMN. At 14 ms stimulus presentation, when participants were able to report stimulus presence, an enhanced negativity at around 175 ms and 305 ms was observed to the deviant and was evident in the subtraction waveform. Although some of the difference observed in the ERPs can be attributed to stimulus characteristics, the use of a ‘lonely’ deviant protocol revealed attenuated visual MMN components at 14 ms stimulus presentation. Overall, results suggest that some degree of conscious attention is required before visual MMN components emerge, suggesting visual MMN is not an entirely pre-attentive process

Atuação do fisioterapeuta nos Núcleos Ampliados de Saúde da Família e Atenção Básica no estado de Sergipe

The aim is to analyze the socioeconomic profile, qualification and the performance of physical therapists in the Family Health and Primary Care Extended Centers (NASF-AB) in Sergipe. This is a cross-sectional study with a qualitative and quantitative character, with descriptive and analytical approaches. The sample consisted of 13 physiotherapists with a profile in which predominantly white women, born in the capital and aged 12 or more years since graduation. Regarding the NASF technological tools, matrix support was the only one used by all participants. Home visits (61.5%) were the most performed activities, of which 84.6% occurred in teams for the elderly population. The weekly actions had an emphasis on health promotion and disease prevention (69.2%) and in the work process 76.9% reported that there was no joint assessment between NASF and managers and 69.2% between NASF and councils. Between the NASF and the FHS, all physical therapists reported to occur. There was also a lack of knowledge about the NASF and a lack of training provision.O objetivo é analisar as características socioeconômicas, de qualificação e a atuação dos fisioterapeutas nos Núcleos Ampliados de Saúde da Família e Atenção Básica em Sergipe. Trata-se de um estudo transversal com caráter quali-quantitativo, com abordagens descritiva e analítica. A amostra foi de 13 fisioterapeutas com predomínio de mulheres, brancas, nascidas em capitais de estados e com 12 ou mais anos de formadas. Com relação às ferramentas tecnológicas do Núcleo Ampliado de Saúde da Família, o apoio matricial foi a única utilizada por todos os participantes. As visitas domiciliares (61,5%) foram as atividades mais realizadas, sendo que dessas, 84,6% ocorreram em equipe e para a população idosa. As ações semanais tinham ênfase na promoção da saúde e prevenção de doenças (69,2%). Quanto ao processo de trabalho, 76,92% relataram que não havia avaliação conjunta entre o Núcleo e gestores, mesma frequência dos que relataram não haver interação entre o Núcleo e o Conselho Municipal de Saúde. Todos afirmaram que ocorria articulação entre o Núcleo e a Equipe de Saúde Família, sendo reconhecido por 53,85% que essa articulação era estabelecida de forma satisfatória. Também foi observada deficiência nos conhecimentos a respeito do Núcleo Ampliado de Saúde da Família e a carência na oferta de capacitações

Comparative Anatomical Analyses of the Forearm Muscles of Cebus libidinosus (Rylands et al. 2000): Manipulatory Behavior and Tool Use

The present study describes the flexor and extensor muscles in Cebus libidinosus' forearm and compares them with those from humans, chimpanzees and baboons. The data is presented in quantitative anatomical indices for similarity. The capuchin forearm muscles showed important similarities with chimpanzees and humans, particularly those that act on thumb motion and allow certain degree of independence from other hand structures, even though their configuration does not enable a true opposable thumb. The characteristics of Cebus' forearm muscles corroborate the evolutionary convergence towards an adaptive behavior (tool use) between Cebus genus and apes