Electronic doping of graphene by deposited transition metal atoms

We perform a phenomenological analysis of the problem of the electronic doping of a graphene sheet by deposited transition metal atoms, which aggregate in clusters. The sample is placed in a capacitor device such that the electronic doping of graphene can be varied by the application of a gate voltage and such that transport measurements can be performed via the application of a (much smaller) voltage along the graphene sample, as reported in the work of Pi et al. [Phys. Rev. B 80, 075406 (2009)]. The analysis allows us to explain the thermodynamic properties of the device, such as the level of doping of graphene and the ionisation potential of the metal clusters in terms of the chemical interaction between graphene and the clusters. We are also able, by modelling the metallic clusters as perfect conducting spheres, to determine the scattering potential due to these clusters on the electronic carriers of graphene and hence the contribution of these clusters to the resistivity of the sample. The model presented is able to explain the measurements performed by Pi et al. on Pt-covered graphene samples at the lowest metallic coverages measured and we also present a theoretical argument based on the above model that explains why significant deviations from such a theory are observed at higher levels of coverage.Comment: 16 pages, 10 figure

Neurologic Involvement in Scleroderma en Coup de Sabre

Localized scleroderma is a rare disease, characterized by sclerotic lesions. A variety of presentations have been described, with different clinical characteristics and specific prognosis. In scleroderma en coup de sabre (LScs) the atrophic lesion in frontoparietal area is the disease hallmark. Skin and subcutaneous are the mainly affected tissues, but case reports of muscle, cartilage, and bone involvement are frequent. These cases pose a difficult differential diagnosis with Parry-Romberg syndrome. Once considered an exclusive cutaneous disorder, the neurologic involvement present in LScs has been described in several case reports. Seizures are most frequently observed, but focal neurologic deficits, movement disorders, trigeminal neuralgia, and mimics of hemiplegic migraines have been reported. Computed tomography and magnetic resonance imaging have aided the characterization of central nervous system lesions, and cerebral angiograms have pointed to vasculitis as a part of disease pathogenesis. In this paper we describe the clinical and radiologic aspects of neurologic involvement in LScs

PROJETO E IMPLEMENTAÇÃO DE FILTRO DE KALMAN EMBARCADO EM FPGA PARA O RASTREIO DE FOGUETES BALÍSTICOS

Neste trabalho faz-se uma abordagem acerca do fiiltro de Kalman no que tange a sua concep-ção, modelamento matemático, algoritmo de fiiltragem e implementação em FPGA (Field Programmable Gate Arrays). Faz-se também um breve estudo sobre o dispositivo lógico programável (PLD) do tipo FPGA, sua arquitetura e suas aplicações. Após o estudo acerca do fiiltro de Kalman e sobre FPGA pas-sa-se para a etapa de embarcar o fiiltro em hardware do tipo FPGA explorando as suas características de processamento paralelo. A etapa fiinal é a validação do fiiltro executando o algoritmo de fiiltragem em FPGA usando dados reais de lançamento de foguetes balísticos. Os dados foram fornecidos pelo Centro de Lançamento de Alcântara (CLA). A principal contribuição deste trabalho é a implementação de uma arquitetura FPGA reconfigurável, garantindo uma plataforma rápida o suficiente para radares com alta precisão e boa capacidade de rastreamento de foguetes.Palavras-chave: Filtro de Kalman. FPGA. Lançamento de foguete. Filtragem.DESIGN AND IMPLEMENTATION OF KALMAN FILTER EMBEDDED IN FPGA FOR TRACKING OF BALLISTIC ROCKETABSTRACT: This work is an approach about the Kalman filter with respect to its design, mathematical modeling, filtering algorithm and implementation in FPGA (Field Programmable Gate Arrays). Also make a brief study on the programmable logic device (PLD) type FPGA, its architecture and its applications. After the study of the Kalman filter on FPGA and passes to the step of embedded on the filter in FPGA type hardware exploring its features parallel processing. The final step is to validate the filter running filtering algorithm in FPGA using real data from launching ballistic rockets. The data were provided by the Alcan-tara Launch Center (CLA). The main contribution of this work is the implementation of a reconfigurable FPGA architecture, ensuring fast enough to radar platform with high accuracy and good tracking capability rockets.KEYWORDS: Kalman filter. FPGA. Rocket launching. Filtering.DISEÑO E IMPLEMENTACIÓN DE FILTRO KALMAN EMBARCARON EN FPGA PARA DETECCIÓN DE ROCKET BALLISTICRESUMEN: Este trabajo es un enfoque sobre el filtro de Kalman con respecto a su diseño, el modelado matemático y la implementación algoritmo de filtrado en FPGA (Field Programmable Gate Arrays). Tambi-én hace un breve estudio sobre el dispositivo lógico programable (PLD) tipo FPGA, su arquitectura y sus aplicaciones. Tras el estudio del filtro de Kalman en FPGA pasa a la etapa de embarcarse en la FPGA hardware tipo de filtro explorar sus características de procesamiento paralelo. El último paso es validar el filtro funcionando algoritmo de filtrado en FPGA utilizando datos reales de lanzamiento de cohetes balísti-cos. Los datos fueron proporcionados por el Centro de Lanzamiento de Alcántara (CLA). La principal con-tribución de este trabajo es la implementación de una arquitectura FPGA reconfigurable, asegurando la suficiente rapidez a la plataforma de radar con alta precisión y buenos cohetes capacidad de seguimiento.PALABRAS CLAVE: Filtro de Kalman. FPGA. Cohete de lanzamiento. El filtrado

Factors Associated with SARS-CoV-2 Infection among Oral Health Team Professionals

Objective: To analyze the factors associated with the SARS-CoV-2 infection among oral health professionals. Material and Methods: This was a cross-sectional study in the city of São Paulo, São Paulo State, Brazil. Professionals from three different categories were included: dental surgeons (DS), dental assistants (DA), and dental hygienists (DH). A questionnaire was created on a digital platform and sent via institutional email to each subject. The questionnaire contained 32 questions about sociodemographic, work, and behavior factors. The data about SARS-CoV-2 infection was confirmed through RT-PCR exams. Descriptive (absolute and relative frequencies) and inferential analyses (chi-squared or Fisher’s exact test) (p<0.05) were performed. Results: There was a SARS-CoV-2 infection prevalence of 3.8% for DS, 30.0% for DH, and 33.3% for DA. SARS-CoV-2 was associated with a lower income (p=0.027), a lower education level (p=0.011), the category of technical professionals (DA and DH) (p=0.025), and using public transportation to commute to work (p=0.009). Conclusion: Sociodemographic factors like lower income and education levels and work factors like job category and public transportation were associated with COVID-19 among professionals on the oral health teams

Factors Associated with SARS-CoV-2 Infection among Oral Health Team Professionals

Objective: To analyze the factors associated with the SARS-CoV-2 infection among oral health professionals. Material and Methods: This was a cross-sectional study in the city of São Paulo, São Paulo State, Brazil. Professionals from three different categories were included: dental surgeons (DS), dental assistants (DA), and dental hygienists (DH). A questionnaire was created on a digital platform and sent via institutional email to each subject. The questionnaire contained 32 questions about sociodemographic, work, and behavior factors. The data about SARS-CoV-2 infection was confirmed through RT-PCR exams. Descriptive (absolute and relative frequencies) and inferential analyses (chi-squared or Fisher’s exact test) (p<0.05) were performed. Results: There was a SARS-CoV-2 infection prevalence of 3.8% for DS, 30.0% for DH, and 33.3% for DA. SARS-CoV-2 was associated with a lower income (p=0.027), a lower education level (p=0.011), the category of technical professionals (DA and DH) (p=0.025), and using public transportation to commute to work (p=0.009). Conclusion: Sociodemographic factors like lower income and education levels and work factors like job category and public transportation were associated with COVID-19 among professionals on the oral health teams

Diagnóstico precoce da neuropatia diabética e profilaxia do pé diabético

Introduction: the diabetic foot is one of the most serious complications of diabetes mellitus. About 50% of non-traumatic amputations occur in these patients. In addition, it is an important public health problem and constitutes a chronic and complex metabolic disorder that is characterized by impaired metabolism of glucose and other complications in essential organs for the maintenance of life. Objective: to evaluate the sensitivity and specificity of diabetic neuropathy using the Michigan self-assessment and physical examination in type 1 and type 2 diabetics. Methods: this is a cross-sectional study. The “Michigan Neuropathy Screening Instruments” classification was used to assess the degree of peripheral neuropathy, in which participants answered the questionnaire and were evaluated for the presence of foot lesions. All participants were stratified by the risk of developing foot ulcers according to the IWGDF protocol. Results: the sample had 200 participants. Regarding the IWGDF classification, 23 patients were classified as moderate risk (11.50%) and 61 as high risk for developing foot ulcers (30.50%). Using a cutoff of 2.5 on the physical examination score to diagnose neuropathy, a sensitivity of 97.62% and a specificity of 47.41% were obtained. Using a score greater than or equal to 6 in the self-assessment for the diagnosis of neuropathy, a sensitivity of 50.00% and a specificity of 94.83% were found. Conclusion: the association of the Michigan physical examination (high sensitivity) with self-assessment (high specificity) increases the accuracy for the diagnosis of diabetic neuropathy.Introdução: o pé diabético é uma das complicações mais sérias do diabetes mellitus. Cerca de 50% das amputações não traumáticas ocorrem nesses pacientes. Além disso, é um importante problema de saúde pública por ser um distúrbio metabólico crônico e complexo que se caracteriza pelo comprometimento do metabolismo da glicose associada a outras complicações em órgãos essenciais para manutenção vital. Objetivo: avaliar a sensibilidade e especificidade para neuropatia diabética da autoavaliação e do exame físico de Michigan nos diabéticos tipo 1 e tipo 2. Método: trata-se de um estudo transversal. Foi utilizada a classificação “Michigan Neuropathy Screening Instruments” para avaliação do grau de neuropatia periférica, em que os participantes responderam ao questionário e foram avaliados quanto a presença de lesões nos pés. Todos os participantes foram estratificados quanto ao risco de desenvolver úlcera nos pés de acordo com o protocolo do IWGDF. Resultados: a amostra contou com 200 participantes. Quanto à classificação do IWGDF, 23 pacientes foram classificados como risco moderado (11,50%) e 61 como alto risco para o desenvolvimento de úlceras nos pés (30,50%). Utilizando-se um corte de 2,5 na pontuação do exame físico para diagnosticar a neuropatia, foi obtida uma sensibilidade de 97,62% e uma especificidade de 47,41%. Utilizando-se uma pontuação maior ou igual a 6 na autoavaliação para o diagnóstico de neuropatia, foi obtida uma sensibilidade de 50,00% e uma especificidade de 94,83%. Conclusão: a associação do exame físico de Michigan (alta sensibilidade) com a autoavaliação (alta especificidade) tem melhor acurácia para o diagnóstico de neuropatia diabética

Um olhar sobre EA e suas práticas na região Sul – a contribuição da REASul

REASul was created in July of 2002, through the project “Weaving Environmental Education Networks in the Southern Region” (“Tecendo Redes de Educação Ambiental na Região Sul”) – Convention with the National Fund of the Environment – (Fundo Nacional do Meio Ambiente – FNMA). The Participative Administration Committee (Comissão de Gestão Participativa – CGP) was formed by representatives of UNIVALI, FURG, CEPSUL, IBAMA-SC e MATER NATURA – Institute of Environmental Studies (Instituto de Estudos Ambientais). The main objective of REASUL was to debate and trace routes in order to disseminate and strengthen Environmental Education (EE) in Brazil, and, specifically, in the Southern Region, contributing to diagnose, socialize and offer visibility to projects and actions in the area, providing subsidies for the educational processes of teachers and environmental managers and for public policies. In the First Meeting of the South Brazilian Network of Environmental Education (I Encontro da Rede Sul Brasileira de Educação Ambiental – I EREASul), the CGP is presenting the partial results of data of EE in the Southern Region, inserted in and validated by the Brazilian System of Information about Environmental Education (Sistema Brasileiro de Informação sobre Educação Ambiental -SIBEA), and discussing with the participants its new organizational structure, formed by the facilitators, people and institutions that work disseminating the culture of networks, guiding lines and principles of Environmental Education (EE). This article presents the preliminary data of the diagnosis of EE and its practices in the Southern Region inserted and validated in the SIBEA.A REASul foi criada em julho de 2002, pelo projeto Tecendo Redes de Educação Ambiental na Região Sul (Convênio com o Fundo Nacional do Meio Ambiente – FNMA). A Comissão de Gestão Participativa (CGP) é formada por representantes da UNIVALI, FURG, CEPSUL, IBAMA-SC e MATER NATURA – Instituto de Estudos Ambientais. O principal objetivo da REASul é debater e traçar rumos para difundir e fortalecer a Educação Ambiental (EA) no Brasil e, particularmente, na região Sul, contribuindo para diagnosticar, socializar e dar visibilidade a projetos e ações na área, fornecendo subsídios para os processos de formação de educadores e gestores ambientais e para as políticas públicas. No I Encontro da Rede Sul Brasileira de Educação Ambiental (I EREASul), a CGP está apresentando os resultados parciais dos dados da EA na Região Sul, inseridos e validados no Sistema Brasileiro de Informação sobre Educação Ambiental (SIBEA), e discutindo com os participantes sua nova estrutura organizacional, formada pelos facilitadores, pessoas e instituições que atuam difundindo a cultura de redes e as diretrizes e princípios da Educação Ambiental (EA). Este artigo apresenta os dados preliminares do diagnóstico da EA e sua práticas na Região Sul inseridos e validados no SIBEA

Can in vitro embryo production be estimated from semen variables in Senepol breed by using artificial intelligence?

Thoroughly analyzing the sperm and exploring the information obtained using artificial intelligence (AI) could be the key to improving fertility estimation. Artificial neural networks have already been applied to calculate zootechnical indices in animals and predict fertility in humans. This method of estimating the results of reproductive biotechnologies, such as in vitro embryo production (IVEP) in cattle, could be valuable for livestock production. This study was developed to model IVEP estimates in Senepol animals based on various sperm attributes, through retrospective data from 290 IVEP routines performed using 38 commercial doses of semen from Senepol bulls. All sperm samples that had undergone the same procedure during sperm selection for in vitro fertilization were evaluated using a computer-assisted sperm analysis (CASA) system to define sperm subpopulations. Sperm morphology was also analyzed in a wet preparation, and the integrity of the plasma and acrosomal membranes, mitochondrial potential, oxidative status, and chromatin resistance were evaluated using flow cytometry. A previous study identified three sperm subpopulations in such samples and the information used in tandem with other sperm quality variables to perform an AI analysis. AI analysis generated models that estimated IVEP based on the season, donor, percentage of viable oocytes, and 18 other sperm predictor variables. The accuracy of the results obtained for the three best AI models for predicting the IVEP was 90.7, 75.3, and 79.6%, respectively. Therefore, applying this AI technique would enable the estimation of high or low embryo production for individual bulls based on the sperm analysis information

A síndrome inflamatória multissistêmica pediátrica e sua relação com a COVID-19 – uma revisão de literatura: Pediatric multisystem inflamatory syndrome and its relation with COVID-19 – a literature review

OBJETIVO: O objetivo deste estudo é identificar, por meio de uma revisão de literatura, a relação fisiopatológica e epidemiológica entre a Síndrome da Inflamação Multissistêmica Pediátrica e a COVID-19, reafirmando a necessidade de mais estudos no entendimento desta nova síndrome. MÉTODOS: Trata-se de uma revisão integrativa de literatura, de estudos criteriosamente selecionados que apresentam as causas e os efeitos do agravamento do quadro clínico causado pelo Sars-Cov-2 na pediatria, ocasionando a Síndrome Multissistêmica Pediátrica (SIM-P), bem como seus dados epidemiológicos no Brasil. RESULTADOS: Os resultados foram obtidos a partir da análise de 58 artigos e destes, foram relevantes 40 estudos no total. As bases de dados utilizadas foram, PubMed, BVS, Scielo e Google Schoolar. CONCLUSÃO: A conclusão leva em consideração teorias para a relação da Sim-P com o Sars Cov-2  que seriam, a ativação da enzima ECA-2, hiperativação imune após a infecção e efeitos da IL-6 na produção de IgG. Dados de exames laboratoriais que apresentam biomarcadores inflamatórios correspondentes com a fisiopatologia da síndrome, sugerem esta hipótese verdadeira. Sua taxa de letalidade no Brasil mostra se em cerca de 6,85%, principalmente em nordeste e sudeste