A lapa do Bugio

A jazida pré-histórica do Bugio constitui uma das mais importantes grutas sepulcrais da faixa estremenha. Encontrava-se intacta à data das primeiras escavações, realizadas em 1957 e 1958. Vicissitudes várias que motivaram a dissolução da primeira equipa e favoreceram diversas depredações, entretanto realizadas, impediram que, antes do recomeço dos trabalhos, em 1966, mesmo dos materiais recuperados, se pudessem extrair todas as informações neles potencialmente contidas. Foi possível, a partir do estudo exaustivo do espólio conservado no Museu de Sesimbra e no recolhido nas escavações de 1966, estabelecer a seguinte sucessão cronológica-cultural: Primeira ocupação - corresponde talvez à ocupação mais importante, integrável no Neolítico recente-final estremenho. Estreitas analogias com o "horizonte dolménico" identificado na vizinha Lapa do Fumo e datado pelo rádio-carbono de 3090 ± 160 a. C. (SERRÃO,1978). A datação realizada no Bugio deu 2800 ± 45 a.C. Segunda ocupação- corresponde muito provavelmente a momento inicial (ou pleno) do Calcolítico, definido pela presença de raros produtos, como o recipiente de osso recolhido na sep. 7 e "ídolos" de calcário, de osso e marfim. Terceira ocupação - Calcolítico final, campaniforme - representada pelos Grupos de Palmela e Inciso. Trata-se da ocupação menos importante, excessivamente valorizada em trabalhos anteriores, talvez pela grande dispersão de fragmentos cerâmicos que não ultrapassam, contudo, nove recipientes (alguns deles representados por apenas um fragmento): taças em calote - (I), de bordo espessado - (I), de tipo Palmela - (I), caçoilas acampanadas - (2), e vasos campaniformes - (2), além de dois recipientes de tipologia mal definida.Le gisement préhistorique de Bugio est l 'une des plus importantes grottes sépulcrales du littoral de l'Estrémadure. Elle a été trouvée intacte lors des premières fouilles, réalisées en 1957 et 1958. Diverses vicissitudes, qui devaient aboutir à la dissolution de la première équipe de fouilleurs et favoriser le pillage du site, empêchèrent la difusion de toute information avant la reprise des travaux en 1966, même sur le matériel récupéré. A partir de l' étude exhaustive du mobilier conservé au Musée de Sesimbra et de celui qui a été découvert en 1966, on a pu établir les niveaux chronologiques suivants: Première occupation, peut-être la plus importante, s'intégrant dans le Néolithique récent et final de l'Estrémadure, présentant d' étroites analogies avec "l'horizon dolménique" identifié sur le site voisin de Lapa do Fumo, daté de 3090 ± 160 a.C. par radio-carbone (SERRÃO, 1978). La datation obtenue à Bugio est de 2800 ± 45 a.C.. Seconde occupation, correspondant très probablement à la phase initiale ou médiane du Chalcolithique, définie par de rares productions, comme le récipient en os recueilli dans la sépulture 7 et les "idoles" en calcaire, en os et en ivoire. Troisième occupation (Chalcolithique final, Campaniforme) représentée par les Groupes de Palmela et incisé. Il s'agit d'une occupation moins importante, surévaluée dans les travaux antérieurs, peut-être en raison de la grande dispersion des fragments de céramiques qui ne correspondaient, cependant, qu'à neuf récipients: coupes en calotte (1 ), coupes au bord épais (1), coupes de type de Palmela (1), casseroles en forme de cloche (2), vases campaniformes (2) et deux récipients à la typologie mal définie

Influence Of The Chemical Surface Structure On The Nanoscale Friction In Plasma Nitrided And Post-oxidized Ferrous Alloy

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Friction is a ubiquitous phenomenon in everyday activities spanning from vehicles where efficient brakes are mandatory up to mechanical devices where its minimum effects are pursued for energy efficiency issues. Recently, theoretical models succeed correlating the friction behavior with energy transference via phonons between sliding surfaces. Therefore, considering that the energy losses by friction are prompted through phonons, the chemical surface structure between sliding surfaces is very important to determine the friction phenomenon. In this work, we address the issue of friction between a conical diamond tip sliding on different functionalized flat steel surfaces by focusing the influence of the chemical bonds in the outermost layers on the sliding resistance. This geometry allows probing the coupling of the sharp tip with terminator species on the top and underneath material surface at in-depth friction measurements from 20 to 200nm. Experimentally, the friction coefficient decreases when nitrogen atoms are substituted for oxygen in the iron network. This effect is interpreted as due to energy losses through phonons whilst lower vibrational frequency excitation modes imply lower friction coefficients and a more accurate adjustment is obtained when a theoretical model with longitudinal adsorbate vibration is used.10511CAPES; Coordenação de Aperfeiçoamento de Pessoal de Nível Superior; FAPERGS; Coordenação de Aperfeiçoamento de Pessoal de Nível SuperiorCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Holmberg, K., Andersson, P., Erdemir, A., (2012) Tribol. Int., 47, p. 221Sabeur, M., Ibrahim, D., Mohamed, E.M., Hassan, Z., (2013) Tribol. Int., 59, p. 240Holmberg, K., Matthews, A., (2009) Coatings Tribology: Properties, Mechanisms, Techniques and Applications in Surface Engineering, , (Elsevier)Cannara, R.J., Brukman, M.J., Cimatu, K., Sumant, A.V., Baldelli, S., Carpick, R.W., (2007) Science, 318, p. 780Persson, B.N.J., Bucher, F., Chiaia, B., (2002) Phys. Rev. B, 65, p. 184106Krim, J., (2012) Adv. Phys., 61, p. 155Erdemir, A., (2005) Surf. Coat. Technol., 200, p. 1792Erdemir, A., Li, S., Jin, Y., (2005) Int. J. Mol. Sci., 6, p. 203Oliver, W.C., Pharr, G.M., (1992) J. Mater. Res., 7, p. 1564Blau, P.J., (2009) Friction Science and Technology: From Concepts to Applications, , (CRC Press)Mo, Y., Turner, K.T., Szlufarska, I., (2009) Nature, 457, p. 1116Lewis, S.P., Pykhtin, M.V., Mele, E.J., Rappe, A.M., (1998) J. Chem. Phys., 108, p. 1157Persson, B.N.J., Tosatti, E., Fuhrmann, D., Witte, G., Wöll Ch., (1999) Phys. Rev. B, 59, p. 11777Shi, Y.-J., Du, Y.-L., Chen, G., (2013) Comput. Mater. Sci., 67, p. 341Niewa, R., Rau, D., Wosylus, A., Meier, K., Hanfland, M., Wessel, M., Dronskowski, R., Schwarz, U., (2009) Chem. Mater., 21, p. 392Isida, S., Suzuki, M., Todo, S., Môri, N., Siratori, K., (1996) Physica B, 219-220, p. 638Ochoa, E.A., Wisnivesky, D., Minea, T., Ganciu, M., Tauziede, C., Chapon, P., Alvarez, F., (2009) Surf. Coat. Technol., 203, p. 1457Roberts, W.L., (1990) Encyclopedia of Minerals, , (Chapman & Hall)Chertihin, G.V., Andrews, L., Neurock, M., (1996) J. Phys. Chem., 100, p. 14609Shebanova, O.N., Lazor, P.J., (2003) Solid State Chem., 174, p. 42

Survival, Mortality, Causes and Places of Death in a European Huntington's Disease Prospective Cohort

Neurological Motor Disorder

Seroconversion in asymptomatic COVID-19 pediatric patients with rheumatic diseases of one tertiary referral hospital

Objectives: To evaluate seroconverted asymptomatic COVID-19 in pediatric Autoimmune Rheumatic Diseases (ARDs) patients and to identify the risk factors related to contagion. Methods: A cross-sectional study was conducted in March 2021, before vaccination of children and adolescents in Brazil, including 77 pediatric ARDs patients, followed at a tertiary hospital and 45 healthy controls, all of them without a previous diagnosis of COVID-19. Data was obtained by a questionnaire with demographic data, symptoms compatible with COVID-19 over the previous year, and contact with people with confirmed COVID-19. Patient's medical records were reviewed to access data regarding disease and current medications. A qualitative immunochromatographic SARS-CoV-2 test was performed on all participants. Results: Patients and controls were similar in terms of female gender (70.1% vs. 57.8%, p = 0.173), age (14 vs. 13 years, p = 0.269) and SARS-CoV-2 positive serology (22% vs. 15.5%, p = 0.481). 80.5% of rheumatic patients were in use of immunosuppressive drugs: 27.3% of them used corticosteroids (33.3% in high doses), and 7.8% on immunobiologicals. No statistical differences were found between positive (n = 17) and negative serology (n = 60) patients regarding demographic/socioeconomic data, contact with people with confirmed COVID-19, use and number of immunosuppressive drugs, use and dose of corticosteroids, use of hydroxychloroquine and immunobiological drugs (p > 0.05). Conclusions: Pediatric rheumatic disease patients were infected at the same rate as healthy ones. Neither the underlying pathology nor its immunosuppressive treatment seemed to interfere with contagion risk

Análise interpretativa das dermatoses mais frequentes em Porto Alegre - Rio Grande do Sul - Brasil

Análise interpretativa das dermatoses mais frequentes em Porto Alegre - Rio Grande do Sul - Brasi