2,063 research outputs found
In Search of Minimal Hypersurfaces
No full textWe study minimal hypersurfaces from the point of view of min-max theory. We present a proof of Yau's conjecture for the abundance of minimal surfaces, which builds on previous works by F. C. Marques and A. Neves, and extend it to some non-compact ambient manifolds. We show a generic equidistribution result for minimal hypersurfaces (joint with F. C. Marques and A. Neves). Then we give a proof of a conjecture by H. J. Rubinstein on realizing strongly irreducible Heegaard splittings of -manifolds by minimal surfaces (joint with D. Ketover and Y. Liokumovich). Other results related to minimal surfaces are explained
Why Should Central Banks Avoid the Use of the Underlying Inflation Indicator?
No full textThis paper assesses the usefulness of the commonly used underlying inflation indicator, in light of the criteria proposed in Marques et al. (2000). Empirical evidence for a group of six countries strongly suggets that the use of underlying inflation as an indicator of trend inflation should be avoided.
Using the First Principal Component as a Core Inflation Indicator
No full textThis paper investigates the consequences of non-stationarity for the principal components analysis and suggests a data transformation that allows obtaining smoother series for the first principal component to be used as a core inflation indicator. The paper also introduces a theoretical model, which allows interpreting core inflation as a common stochastic trend to the year-on-year rates of change of the price indices of the basic CPI items. Finally, it is shown that the first principal component computed in real time meets the evaluation criteria introduced in Marques et al. (2000).
Joint head pose/soft label estimation for human recognition in-the-wild
No full textSoft biometrics have been emerging to complement other traits and are particularly useful for poor quality data. In this paper, we propose an efficient algorithm to estimate human head poses and to infer soft biometric labels based on the 3D morphology of the human head. Starting by considering a set of pose hypotheses, we use a learning set of head shapes synthesized from anthropometric surveys to derive a set of 3D head centroids that constitutes a metric space. Next, representing queries by sets of 2D head landmarks, we use projective geometry techniques to rank efficiently the joint 3D head centroids/pose hypotheses according to their likelihood of matching each query. The rationale is that the most likely hypotheses are sufficiently close to the query, so a good solution can be found by convex energy minimization techniques. Once a solution has been found, the 3D head centroid and the query are assumed to have similar morphology, yielding the soft label. Our experiments point toward the usefulness of the proposed solution, which can improve the effectiveness of face recognizers and can also be used as a privacy-preserving solution for biometric recognition in public environments
Attachment of cultured fibroblasts and ultrastructural analysis of simulated cervical resorptions treated with high-power lasers and MTA
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Previous issue date: 2010Objective. The present study evaluated the fibroblast attachment and the morphologic changes of simulated cervical root resorptions after irradiation with high-power lasers and the use of mineral trioxide aggregate (MTA). Study design. Standardized cavities were done on the coronal third of 40 single-rooted teeth and assigned into 4 groups according to the treatment applied: ( 1) untreated control, ( 2) use of MTA, ( 3) irradiation with Er:YAG laser (42 mJ, 10 Hz, 10 s), and ( 4) irradiation with high-power diode laser ( 1 W, 10 s). Fragments were prepared for SEM analysis: 6 samples of each group were plated with human gingival fibroblasts and 4 samples were used for ultrastructural analysis. Results. The cells' attachment was in decreasing order: G3 > G4 > G1 > G2, with statistical differences among all groups ( P < .05). The samples irradiated with Er: YAG exhibited roughness on the dentinal surface, no smear layer, and open dentinal tubules; those irradiated with diode laser exhibited a smooth surface, more smear layer, and closed dentinal tubules; and the control group showed high amount of smear layer and closed dentin tubules. Conclusions. Irradiation with Er: YAG and diode lasers caused morphologic changes on the dentinal surfaces of simulated resorptions that favored cells' adhesion. MTA showed lower biocompatibility than irradiated groups but allowed cells' adhesion. ( Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2010;109:e154-e161)[Raldi, Denise Pontes; Habitante, Sandra Marcia; Lage-Marques, Jose Luiz] Universidade de Taubaté (Unitau), Div Endodont, Dept Dent, Sao Paulo, Brazil[Mello, Isabel] Univ Manitoba, Div Endodontol, Dept Restorat Dent, Winnipeg, MB, Canada[Claro Neves, Ana Christina] Universidade de Taubaté (Unitau), Div Prosthodont, Dept Dent, Sao Paulo, Brazil[Patricia Miyagi, Suely Sueli] Univ Sao Paulo, Div Endodont, Dept Restorat Dent, Sch Dent, Sao Paulo, Brazi
Norway
No full textThis is a pre-copyedited, author-produced version of an article accepted for publication in the Yearbook of International Environmental Law following peer review. The version of record das Neves, M.M. (2019). C. Norway. Yearbook of International Environmental Law (2017) 28, 297-305, is available online at: https://doi.org/10.1093/yiel/yvy017
The upper Paleozoic miospore genus Spelaeotriletes Neves and Owens, 1966, and constituent Gondwanan species
No full textThe upper Paleozoic miospore genus Spelaeotriletes Neves and Owens, 1966 is reviewed as a morpho-taxonomic entity and vis-a-vis other similarly constructed (pseudosaccate) genera - Geminospora Balme, 1962, Grandispora Hoffmeister, Staplin, and Malloy, 1955, Rhabdosporites Richardson, 1960, and Retispora Staplin, 1960. Detailed studies of numerous, mainly topotype specimens of Spelaeotriletes ybertii (Marques-Toigo, 1970) Playford and Powis, 1979 from the Lower Permian of Uruguay result in its re-diagnosis, in conjunction with a survey of its exclusively Gondwanan occurrences, particularly in South American strata extending from the Upper Carboniferous (Westphalian) into the Lower Permian, and also in Australian strata of approximately equivalent age. The characteristics of other species of Spelaeotriletes reported from upper Paleozoic deposits of Gondwana are discussed, as are their temporal representations in various broad regions of the supercontinent (South America, North Africa, Australia). These species include two, perhaps three, that, like Spelaeotriletes triangulus/arenaceus, are known also from Euramerica - S. balteatus (Playford, 1963) Higgs, 1996, S. pretiosus (Playford, 1964) Utting, 1987, and possibly S. owensii Loboziak and Alpern, 1978. Other species, such as S. benghaziensis Loboziak and Clayton, 1988, S. giganteus Loboziak and Clayton, 1988, and S. vibrissus Playford and Satterthwait, 1988, have, on present knowledge, exclusively Gondwanan occurrences. S. queenslandensis Jones and Truswell. 1992, known only from Upper Carboniferous strata of northeastern Australia, is formally reassigned on sculptural grounds to Grandispora. Not unexpectedly in a paleogeographic perspective, North Africa and South America are more closely allied with each other than with Australia in terms of shared species of Spelaeotriletes. (C) 2001 Elsevier Science Ltd. All rights reserved
Avaliação do desempenho dos componentes de cartão em embalagens
No full textMestrado em Engenharia QuímicaEsta dissertação tem como objetivo avaliar a influência de matérias-primas pré-selecionadas e das condições processuais utilizadas no fabrico de embalagens de cartão da Empresa Cartig, Cartão e Artigos para Embalagem, Lda. Propõe-se neste trabalho, melhorar a aparência do produto final, tendo em consideração a qualidade e a fiabilidade dos produtos, face aos seus clientes.
Inicialmente, determinou-se a composição química e morfológica de três cartolinas distintas pré-selecionadas, com gramagens diferentes, Barcelona 250 g∙m-2, Brasil 250 g∙m-2 e Brasil 225 g∙m-2. Estas cartolinas fazem parte da embalagem final de cartão.
Através da técnica de medição do ângulo de contacto, comparou-se o desempenho das cartolinas referidas anteriormente, a diferentes condições de humidade (40% e 80%) e temperatura (≈20°C e 35°C), para avaliar as condições processuais no fabrico das embalagens. A partir desta mesma técnica, estudou-se o desempenho de contracolagem e colagem das colas frias, Euroflex 5119 e INDU C 2065, usadas no processo contracolagem de cartolinas, e Aquence FB 7371 e Aquence FB 7362 utilizadas no processo colagem de embalagens da empresa.
Ainda neste trabalho, determinaram-se as propriedades e as características das colas frias utilizadas no processo de colagem e contracolagem, através do pH, teor de sólidos, viscosidade, assim como, das técnicas FTIR-ATR e TGA.
A análise térmica DCS foi aplicada apenas à cola quente Technomelt Supra Ultra GA 3920 usada na colagem das embalagens.
Estimaram-se as propriedades físico-mecânicas das cartolinas pré-selecionadas que são fundamentais para a caracterização da resistência e qualidade do material. O tempo de secagem ótimo das colas utilizadas no processo de colagem da empresa foi determinado através de ensaios fabris, com um estudo da humidade relativa ao longo do tempo das cartolinas China 200 g∙m-2 e Avelino Bastos 225 g∙m-2. O grau de adesividade foi determinado através do Teste de Adesividade (PAT) a todas as colas e cartolinas envolvidas no trabalho.
Verificou-se que as condições fabris (temperatura e humidade) influenciam bastante os resultados de contracolagem, especialmente a baixas temperaturas. Nesta dissertação conclui-se também que, a cola mais favorável para o processo de colagem da empresa é a cola Aquence FB 7371 e, no processo de contracolagem é a Euroflex 5119, sendo que estas impregnam-se pouco nas cartolinas e canelados em condições de temperaturas elevadas e humidades reduzidas (35ºC e 40%), evitando prejudicar a aparência da embalagem. Por último, face às três cartolinas pré-selecionadas, a Brasil 250 g∙m-2 é a cartolina com melhores características, propriedades de resistência, qualidade e relação cola/adesividade. Esta em condições de baixa humidade e temperaturas elevadas apresenta elevados ângulos de contacto com as colas estudadas, mantendo uma adesividade elevada e uma boa performance.This dissertation aims to evaluate the influence of pre-selected raw materials and the procedural conditions used in the manufacture of carton packs of the company Cartig, Cartão e Artigos para Embalagem, Lda. The objective of this work was to improve the appearance of the final product, considering the quality and reliability of the products, for the customers.
Initially, the chemical and morphological composition of three pre-selected different cardboards with different weights, namely, Barcelona 250 g∙m-2, Brazil 250 g∙m-2 and Brazil 225 g∙m-2, were determined. These cartons are part of the final carton package.
Through the contact angle measurement technique, the performance of the above-mentioned cardboards was compared to different humidity conditions (40% and 80%) and temperature (≈20 ° C and 35 ° C) to evaluate the procedural conditions in the manufacturing of packages. Using the same technique, the glue performance and gluing performance of the cold glues, Euroflex 5119 and INDU C 2065, used in the backed gluing process of cardboards, and Aquence FB 7371 and Aquence FB 7362 used in the gluing process of the company packaging were studied.
Also in this work, the properties and characteristics of cold glues used in the gluing and backed gluing processes were determined through pH, solids content, viscosity, as well as FTIR-ATR and TGA techniques. Thermal DCS analysis was applied only to the hot glue Technomelt Supra Ultra GA 3920 used in the gluing of packages.
The physical-mechanical properties of the pre-selected cardboards were determined, being these fundamental for the characterization of the strength and quality of the material. The optimal drying time of the glue used in the gluing process of the company was determined by manufacturing tests, the study of moisture over time, to the cardboards China 200 g∙m-2 and Avelino Bastos 225 g∙m-2. The degree of adhesiveness was determined through the Pin Adhesion Test (PAT) to all glues and cardboards involved in the work.
It has been found that the manufacturing conditions (temperature and humidity) greatly influence the results of the backed gluing, especially at low temperatures. In this dissertation, it is also concluded that the glue most favorable to the gluing process of the company is the glue Aquence FB 7371 and, in the process of back gluing is the Euroflex 5119, which impregnates less in the cardboards on conditions of high temperatures and reduced humidity (35ºC and 40%), avoiding to spoil the appearance of the packaging. Finally, comparing the three pre-selected cardboards, Brazil 250 g∙m-2 is the cardboard with the best characteristics, resistance properties, quality and glue/adhesion ratio. It is in conditions of low humidity and high temperatures that it has high angles of contact with the glues studied, maintaining a high adhesiveness and good performance
A Informática na educação
No full textDissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico. Programa de Pós-Graduação em Engenharia de Produção.A utilização de computadores na educação tem sido muito discutida ultimamente, consequentemente gerando muita inquietação no contexto educacional. O ensino e aprendizagem envolvem muitas variáveis, sendo um tema complexo que requer conhecimentos multidisciplinares. A determinação de quanto e como os computadores influenciam este processo pode ser feita de várias formas, sendo que cada uma delas pode percorrer caminhos distintos, revelando diferentes relações. A maioria dos trabalhos que envolvem computadores no processo de ensino e aprendizagem, extraem conclusões através de observações, sendo que em muitos casos a validade das pesquisas poderiam ser ampliadas com o uso de outros métodos. A informática na escola faz com que o computador enquanto ferramenta pedagógica, esteja aliado a educação e possibilite ao educando preparo para enfrentar a sociedade do século XXI. Sendo assim, o tema aqui abordado enfocará a introdução da informática na escola, sem a pretensão de esgotar o assunto, mas como um objeto de estudo para futuras reflexões
Urban environmental quality of Baeta Neves district, São Bernardo do Campo (SP)
No full textO presente trabalho teve por objetivo analisar os atributos ambientais: uso do solo, espaços livres públicos, verticalidade das edificações, cobertura vegetal e densidade demográfica, espacializando-os para definição da qualidade ambiental urbana do Distrito Baeta Neves, município de São Bernardo do Campo (SP). A base teórica da pesquisa foi fundamentada no conceito de Paisagem e a metodologia empregada para atender aos objetivos pretendidos fundamentou-se no método desenvolvido por Nucci (2001), que diagnostica e espacializa de forma integrada os atributos selecionados, considerando-os como indicadores da qualidade ambiental. Foram considerados os diferentes usos do solo e as condições do meio físico urbano, contribuindo para identificarmos as áreas críticas do Distrito. Houve predomínio de trechos com média de dois a três atributos ambientais negativos como: deserto florístico, déficit de espaços livres públicos e alta densidade demográfica. Apesar disso, a região central do Distrito obteve bons resultados no total de atributos negativos, com áreas de ausência de atributo negativo. Os índices de cobertura vegetal e de espaços livres públicos foram os fatores de maior relevância na definição da qualidade ambiental urbana do Distrito, como, por exemplo, a Vila Baeta Neves que apresentou maior quantidade de arborização de rua e menores índices de deserto florístico. Diante disso, efetuou-se a análise conjunta das cartas dos atributos selecionados, gerando a carta de qualidade ambiental da área de estudo. Posteriormente, foram propostas formas de melhoria da qualidade ambiental para o Distrito Baeta Neves e sua aplicabilidade no planejamento municipal e na elaboração de políticas ambientais que orientem a melhor ocupação do espaço urbanoThis study aimed at analyzing environmental attributes such as (a) land use, (b) public open spaces, (c) vertical building, (d) vegetation coverage and (e) demographic density, while spatializing them into a definition of urban environmental quality based on the district of Baeta Neves, in Sao Bernardo do Campo (state of Sao Paulo, Brazil). The theoretical framework for this research was based on the concept of landscape, and the applied methods to reach the established goal was based on Nuccis (2001) methodological approach, which diagnoses and spatializes, fully, the selected attributes, considering them as indicators of environmental quality. I considered distinct land uses and urban physical environment conditions contributing to the identification of critical areas in the studied district. I have found large frequencies of areas with an average of two or three negative environmental attributes, such as: floristic desert, deficit of public open spaces and high demographic density. Vegetative cover and public open spaces indexes appeared as the most relevant factors in defining the urban environmental quality of the studied district. For instance, Village of Baeta Neves presented the highest quantity of street arborization and the lowest indexes of floristic deserts. Based on these elements, I carried out a joint analysis of each selected attribute map, creating the map of environmental quality for the studied area. After that, I suggested ways to improve the environmental quality of the district of Baeta Neves and, also, potential uses in city planning and development of environmental policies to better guide occupation of urban spac
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