107 results on '"Plasticity"'
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2. MODALIDADES VENTILATÓRIAS PARA PACIENTES COM SARS-COV-2: UMA REVISÃO DE LITERATURA.
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Moura Almeida, Daniel Antonio, Miotto Chiossi, Alexssandra Cristina, Gonçalves Pinculini, Ana Paula, Perazzoli de Souza, Alesandra, Matte, Rafael, and de Bortoli Beal, Solange
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SARS disease ,POSITIVE end-expiratory pressure ,LITERATURE reviews ,MECHANICAL ventilators ,CONDITIONED response - Abstract
Copyright of Revista Foco (Interdisciplinary Studies Journal) is the property of Revista Foco and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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- 2023
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3. Yield components of soybean cultivars under sowing densities
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João Antônio Paraginski, Marcos Toebe, Mariana Poll Moraes, Rafael Rodrigues de Souza, Pedro Elmar Paraginski, and Karina Chertok Bittencourt
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Glycine max ,plant population ,plasticity ,grain yield ,Agriculture (General) ,S1-972 ,Biotechnology ,TP248.13-248.65 - Abstract
ABSTRACT The aim of this study was to assess yield components and grain yield of soybean cultivars in response to sowing densities. For this, two soybean cultivars and five sowing densities were tested, in a two-factor scheme. The following yield components were measured by the end of the cycle: plant height; insertion height of the first pod; number of nodes per plant; number of pods with one, two, three and four grains; number of pods per plant; number of grains per plant; weight of a thousand grains; humidity and grain yield. Sowing densities did not cause significant variations of grain yield (bags ha-1) for any cultivar, however, higher populational densities promoted a reduction in the number of pods with two and three grains, as well as a reduction in the total number of pods and grains per plant for both cultivars. Cultivar NS 5700 IPRO was the most productive, with a higher number of pods with two and three grains and number of pods and grains per plant.
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- 2022
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4. What do We Talk About When We Talk About Post-Pandemic Time in School Education?
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Samira Alirezabeigi
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algorhythms ,post-pandemic school ,taskification ,accident ,plasticity ,Education ,Special aspects of education ,LC8-6691 - Abstract
This paper reflects on post-pandemic school condition and speculates the temporal characteristics of post-pandemic school education based on an empirical school study. By conceptualising pandemic as an accident as developed by Malabou (2012) and adopting the timescape perspective as a methodological device to identify the characteristics of post-pandemic schools, this paper reflects on an ethnographic study of a school which adopts a bring your own device (BYOD) policy. The paper identifies three turns for post-pandemic school condition, namely a turn towards algorhythmic patterns (Miyazaki, 2012), infraschoolization and taskification of classroom practices (Alirezabeigi, 2021). By showing how classroom practices are organized around devices, students and teachers, the paper elaborates on spatiotemporal reconfigurations of schools and centrality of tasks for post-pandemic education. Based on these turns and the concept of plasticity, the paper concludes that the post-pandemic condition can be described as a plastique stability after the accident of pandemic.
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- 2023
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5. O cérebro imanente: introdução à neurofilosofia de Catherine Malabou.
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Pinto Neto, Moysés
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INTERNALIZING behavior ,THEORY of knowledge ,HUMANITIES ,POLITICAL science ,NEUROSCIENCES ,CAPITALISM ,DUALISM ,ARTIFICIAL intelligence ,NEUROETHICS - Abstract
Copyright of Veritas is the property of EDIPUCRS - Editora Universitaria da PUCRS and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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- 2022
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6. Multiple mechanisms in which agricultural insects respond to environmental stressors: canalization, plasticity and evolution
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Yeisson Gutiérrez
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decline ,global change ,insecticide resistance ,pesticides ,plasticity ,pollinators ,pollution ,Agriculture ,Agriculture (General) ,S1-972 - Abstract
Insects are a paramount component of biodiversity in terms of taxonomic richness, ecological functions and ecosystem services. However, many human activities have negative consequences on such organisms, causing changes in their morphology, physiology, behaviour, and even causing mass deaths leading to the well-recognized insect decline phenomenon. Although the effects of some environmental stressors (e.g. global warming and pesticides) on insect biology are fairly well understood, there is a plethora of stressors that that have only recently been considered. Additionally, although the exposure to multiple stressors is a common scenario in natural conditions, our knowledge on insect responses in this regard is still incipient. Knowledge that is in much need to inform policy makers in the fight against global change. Here, a short review on prominent environmental stressors, and the known responses that insects may exhibit, which are summarized as canalization, plasticity and evolution is provided. Furthermore, an outlook and recommendation for future studies aiming to elucidate the effects of environmental stressors (both lone and mixed) on insect biology is given. This manuscript advocates for controlled (lab or semi-field) manipulative experiments that implement realistic environmental conditions and that ideally combine several stressors.
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- 2020
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7. Yield performance of oat cultivars in response to sowing dates and densities
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José Henrique Bizzarri Bazzo, Klever Márcio Antunes Arruda, Inês Cristina de Batista Fonseca, and Claudemir Zucareli
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Avena sativa L. ,Growing environments ,Management techniques ,Plasticity ,Productivity. ,Agriculture (General) ,S1-972 - Abstract
Adjustment of seeding density oriented by genotype and conditions of the growing environment may favor growth, development and yield performance of the oat crop. This study aimed to evaluate the growth, lodging, yield components, and grain yield of oat cultivars grown at different sowing dates and densities. Two independent experiments were conducted at two sowing dates (May 5 and June 24) in Londrina-PR under a randomized block design in a 4 × 2 factorial scheme, with four replications. Treatments consisted of four sowing densities (180, 240, 300, and 360 viable seeds m-2) and two cultivars (IPR Afrodite and IPR Artemis). Plant height, number of panicles.m-2, number of spikelets per panicle, number of grains per spikelet, number of grains per panicle, thousand-grain weight, plant lodging, and grain yield were evaluated. The data were submitted to the analysis of joint variance for sowing dates, separately for the cultivars. The averages of sowing dates were compared by the F test and densities submitted to polynomial regression analysis up to 2nd degree, at 5% probability. The first sowing date favors most yield components and grain yield of the cultivars IPR Afrodite and IPR Artemis. In contrast, the number of panicles m-2 was reduced during this growing season for both cultivars. The late sowing date for the IPR Artemis cultivar resulted in a high percentage of lodging at all evaluated densities. However, this phenomenon is more intense at higher sowing densities during the first sowing date. Yield components and grain yield varied according to sowing dates and densities and the cultivar. The highest grain yield of the cultivar IPR Afrodite at the first sowing date was achieved with a lower sowing density than in the later date. However, the highest grain yield of the IPR Artemis cultivar was achieved at density of 280 viable seeds m-2, regardless of the growing season.
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- 2021
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8. Palavra e gênero: um movimento dialógico orquestrado por plasticidade e coercitividade.
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Batista, Adriana Danielski
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- 2021
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9. Growth of provenances of Cryptocarya alba during water stress and after re–watering in the nursery
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Sergio Enrique Espinoza Meza, Marco Aliro Yáñez Arce, Carlos Renato Magni Díaz, Eduardo Enrique Martínez Herrera, Juan Francisco Ovalle Ortega, and Suraj Antonio Vaswani Miranda
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Sclerophyllus forests ,seed sources ,drought ,plasticity ,biomass allocation ,Agriculture (General) ,S1-972 - Abstract
ABSTRACT: Intensification of drought in Mediterranean–type climates has limited seedling establishment. The knowledge of the ecology of selected species and its intraspecific variation to water stress at the seedling stage should be considered in order to overcome limitations. We investigated variations in growth, survival, and leaf–level physiology in four provenances of the endemic Cryptocarya alba (Mol.) during water stress and after re–watering. Seedlings were cultured in the nursery during 23 months and then subjected to two watering treatments based on soil water content (well–watered and water restriction, 0.38 and 0.17 cm3 cm−3, respectively) for 45 days. At the end of the watering treatments, seedling growth, above– and belowground biomass, survival, and leaf gas exchange were measured. Right after the watering treatments, the surviving seedlings were submitted to a recovery period of 21 days, in which all seedlings were re–watered at 0.38 cm3 cm−3 of soil water content and measured for leaf gas exchange. Provenances differed in growth and biomass allocation. Unlike growth and biomass, interaction between provenance and watering treatments was found for photosynthesis, stomatal conductance, transpiration, and water use efficiency of northern provenances, exhibiting the highest performance under water restriction. However, most variations observed occurred before the re–watering period and only a few occurred after this period. The four provenances under study exhibited similar photosynthesis and stomatal conductance after re–watering. Our study demonstrated phenotypic variation of C. alba and the capability of the species to withstand and recover from water stress.
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- 2021
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10. Phenology and Tree Radial Growth of Schinus terebinthifolius in a Subtropical Forest
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Jaçanan Eloisa de Freitas Milani, Rodrigo de Andrade Kersten, Tomaz Longhi - Santos, Franklin Galvão, Erika Amano, Carlos Velozzo Roderjan, and Maria Raquel Kanieski
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Demand ,Flowering ,Increment ,Plasticity ,Resources ,Forestry ,SD1-669.5 - Abstract
Abstract During a period of 5 years, we monthly monitor the phenology and the stem diameter increment of 12 of Schinus terebinthifolius trees. Dendrometer bands were used for it. This study was aimed to answer the following questions: (i) Are there conflicting demands for resource allocation in different phenophases? (ii) In which period does the stem diameter increment occur? (iii) Which phenophases are more likely related to stem radial growth? The phenological observations were carried out using the Activity Index. In order to identify patterns in phenology and diameter increment over the assessment period (2010-2015), we performed an analysis of seasonal decomposition, followed by Pearson’s correlation analysis. Apparently, there is no conflicting demand for resources, but an optimized distribution of them, regulated mainly by the allocation of nutrients derived from leaf senescence, as well as, temperature rise and photoperiod. Higher diameter growth rates occurred from December to March which coincided with the flowering period.
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- 2020
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11. Anamorphoses: projeções cíclicas, deformações geradoras: plasticidade sonora em Anamorphoses V e VII de Isabel Soveral.
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LUÍS POSTIGA, JOSÉ
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MUSICAL analysis ,ARTISTIC creation ,ART ,MUSICAL composition ,COMPOSERS - Abstract
Copyright of Estúdio (1647-6158) is the property of Revista Estudio and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2020
12. Antoni Miralda: O alimento como criação artística.
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FRUTUOSO DE OLIVEIRA, RITA ALEXANDRA RIBEIRO
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PLASTICS ,ARTISTS - Abstract
Copyright of Revista Gama is the property of Revista Gama and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2020
13. Correlação entre a composição química e mineralógica e as características plásticas de folhelhos do Nordeste do Brasil.
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Apolônio, T. G., Amorim, L. V., and Leal, C. A.
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Copyright of Revista Eletrônica de Materiais e Processos is the property of Revista Eletronica de Materiaia e Processos and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2020
14. Sob a pele da escultura: uma breve nota sobre as propostas contemporâneas de Susana Piteira.
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VERDE REIS CHARRÉU, LEONARDO AUGUSTO
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SCULPTURE ,AESTHETICS ,PANORAMAS ,FEMININITY ,CONCEPTS - Abstract
Copyright of Revista Gama is the property of Revista Gama and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2020
15. Afro-Brasilidade: a estética do produto.
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Nunes dos Santos, Jefferson, Diego da Silva Almeida, Anderson, and Costa Silva, Luís Antônio
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DESIGN ,AESTHETICS ,ARTISTIC creation ,SYMBOLISM in art ,META-analysis - Abstract
Copyright of Actas de Diseño is the property of Facultad de Diseno y Comunicacion, Fundacion Universidad de Palermo and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2018
16. Invisibilidade, superficialidade e plasticidade: três hipóteses sobre as câmeras inteligentes
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Icaro Ferraz Vidal Junior
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smart cameras ,digital technologies ,plasticity ,Language and Literature ,Philology. Linguistics ,P1-1091 ,Communication. Mass media ,P87-96 - Abstract
This paper proposes three hypotheses concerning the smart cameras: 1) there is a tendency of the algorithmically inscribed diagrams on the surface of the image in order to make themselves invisible; 2) the emphasis on superficiality of conducts is linked to the replacement of the privileged locusof subjectivity towards the surface of the bodies in the second half of the twentieth century and to a contemporary emphasis on action; 3) the predictive and anticipatory nature of intelligent devices of visibility is an important indicator of a contemporary crisis here formulated as a crisis of plasticity and habit.
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- 2016
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17. Usina do Trabalho do Ator: reconnaissance d’une identité
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Eliane Tejera Lisbôa
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Theatre Anthropology ,Plasticity ,lcsh:PN1600-3307 ,plasticidade ,lcsh:Drama ,Recherche Actorale ,Anthropologie Théâtrale ,Usina (UTA) ,pesquisa atoral ,Musicality ,antropologia teatral ,Plasticité ,Actor’s Research ,Usina do Trabalho do Ator (UTA) ,musicalidade ,lcsh:PN2000-3307 ,lcsh:Dramatic representation. The theater ,Musicalité - Abstract
This article describes the main points of the career of the theatre group UTA – Usina do Trabalho do Ator, by making a brief overview of its scenic achievements thus far. We also seek to recognize the more important characteristics of UTA, built and set up along this career, such as the plasticity and musicality of its achievements, dramaturgy itself, a result of the group’s experiments and improvisations, as well as a permanent and careful actor’s research, supported mainly by theatrical anthropology practices., Cet article a pour objectif de raconter l’histoire de l’UTA (Usine du Travail de l’Acteur), dans ses points essentiels, à travers un bref aperçu de ses réalisations scéniques jusqu’à présent. Il s’agit d’identifier, par la même occasion, les caractéristiques déterminantes de l’identité de l’UTA construite et sédimentée tout au long de ce parcours: la plasticité et la musicalité de ses réalisations; sa dramaturgie propre, résultat des expériences et des improvisations de la compagnie; et sa recherche actorale permanente et attentive qui s’appuie principalement sur les études et les pratiques de l’anthropologie théâtrale., Este artigo tem como objetivo contar a trajetória da UTA - Usina do Trabalho o Ator, em seus pontos fundamentais, através do traçado de um breve panorama de suas realizações cênicas até o momento. Busca-se reconhecer, ao mesmo tempo, as características determinantes da identidade da Usina, construída e sedimentada ao longo deste percurso, tais como: a plasticidade e a musicalidade de suas realizações, a dramaturgia própria, fruto das experiências e improvisos do grupo, e a permanente e cuidadosa pesquisa atoral, apoiada essencialmente nas práticas da antropologia teatral.
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- 2022
18. MOBILIDADE E PLASTICIDADE DO TRABALHO: REFLEXÕES TEÓRICAS.
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Oliveira Moreira, Silmara and Santos, Janio
- Abstract
Copyright of Pegada is the property of Pegada and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2018
19. Calidad de semillas y plasticidad de la soja con diferentes hábitos de crecimiento
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Decarli, Leticia, Ludwig, Marcos Paulo, Decarli, Júlia, Garbin, Thales, Martins, Juliano Dalcin, Villa, Bruna de, Tokura, Luciene Kazue, and Cerveira, Mateus Pereira
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Plasticidade ,Suma térmica ,Plasticity ,Vigor ,Plasticidad ,Glycine max (L.) Merril ,Thermal sum ,Soma térmica - Abstract
This study aimed to evaluate the effect of the physiological quality of seeds on plastocrono, productivity and behavior of soybean cultivars. The experiment was conducted in the periods 2015/2016 and 2016/2017 in the middle plateau of the state of Rio Grande do Sul. Determined (BMX Active RR and Uranus RR FPS) and undetermined (5855 RSF IPRO and Don Mario 5958 RSF IPRO) cultivars were used. In each year of cultivation were conducted two trials in plant population and isolated plants from seeds with superior and inferior quality. The plastocrono was evaluated during the development of the plants and, at the end, the evaluation of productivity and production components was performed. The results were evaluated by analysis of variance and the mean values were compared by the Tukey test at 5%. The plastocrono was influenced by the availability of water, the form of growth was not determinant in the definition of plastocrono. Plants originated from seeds of lower quality need more plastocrono during its cycle. Plants of origin of seeds of superior quality produce more grains both in plant population and in isolation. Plant development was not a determining factor for productivity. Este trabajo tuvo por objetivo evaluar el efecto de la calidad fisiológica de semillas en el plastocrono, productividad y comportamiento de cultivares de soja. El experimento se llevó a cabo en los períodos 2015/2016 y 2016/2017 en la meseta media del estado de Rio Grande do Sul. Se utilizaron variedades determinadas (BMX Activa RR y FPS Urano RR) e indeterminadas (5855 RSF IPRO y Don Mario 5958 RSF IPRO). En cada año de cultivo se realizaron dos ensayos en población de plantas y en plantas aisladas provenientes de semillas con calidad superior e inferior. Se evaluó el plastocrono durante el desarrollo de las plantas y al final se realizó la evaluación de la productividad y de los componentes de la producción. Los resultados fueron evaluados por medio del análisis de varianza y los valores medios fueron comparados por el test de Tukey al 5%. El plastocrono fue influenciado por la disponibilidad hídrica, la forma de crecimiento no fue determinante en la definición del plastocrono. Plantas originadas de semillas de menor calidad necesitan de mayor plastocrono durante su ciclo. Plantas de origen de semillas de calidad superior producen más granos tanto en población de plantas como de forma aislada. El desarrollo de las plantas no fue un factor determinante para la productividad. Este trabalho teve por objetivo foi avaliar o efeito da qualidade fisiológica de sementes no plastocrono, produtividade e comportamento de cultivares de soja. O experimento foi conduzido nos períodos de 2015/2016 e 2016/2017 no planalto médio do estado do Rio Grande do Sul. Foram utilizadas cultivares determinadas (BMX Ativa RR e FPS Urano RR) e indeterminadas (5855 RSF IPRO e Don Mario 5958 RSF IPRO). Em cada ano de cultivo foram conduzidos dois ensaios em população de plantas e em plantas isoladas provenientes de sementes com qualidade superior e inferior. Foi avaliado o plastocrono durante o desenvolvimento das plantas e ao final realizada a avaliação da produtividade e dos componentes da produção. Os resultados foram avaliados por meio da análise de variância e os valores médios foram comparados pelo teste de Tukey a 5%. O plastocrono foi influenciado pela disponibilidade hídrica, a forma de crescimento não foi determinante na definição do plastocrono. Plantas originadas de sementes de menor qualidade necessitam de maior plastocrono durante seu ciclo. Plantas de origem de sementes de qualidade superior produzem mais grãos tanto em população de plantas como de forma isolada. O desenvolvimento das plantas não foi fator determinante para a produtividade.
- Published
- 2022
20. Elastic-plastic model for rapid evaluation of fatigue life of railway tracks under variable contact loads
- Author
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Costa, Thairon Reis, 1989, Santos Júnior, Auteliano Antunes dos, 1963, Dias, Allan Patrick Cordeiro, 1984, Pavanello, Renato, Bittencourt, Marco Lúcio, Souza, Roberto Martins de, Gay Neto, Alfredo, Universidade Estadual de Campinas. Faculdade de Engenharia Mecânica, Programa de Pós-Graduação em Engenharia Mecânica, and UNIVERSIDADE ESTADUAL DE CAMPINAS
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Plasticidade ,Finite element method ,Materials - Fatigue ,Plasticity ,Materiais - Fadiga ,Railway ,Método dos elementos finitos ,Ferrovias - Abstract
Orientadores: Auteliano Antunes dos Santos Júnior, Allan Patrick Cordeiro Dias Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecânica Resumo: Esta tese propõe um modelo para avaliação da vida em fadiga de trilhos ferroviários sujeitos a contato em rolamento, que permita obter respostas mais rápidas que os modelos atualmente empregados e com precisão suficiente para análise de Fadiga Multiaxial, podendo ser adaptado para outros empregos. Inicialmente, o trilho é modelado utilizando o Método dos Elementos Finitos – MEF, considerando regime linear elástico; e a aplicação de carga de contato é feita utilizando uma abordagem analítico-numérica. Em seguida, um conjunto de simulações é realizado empregando uma estratégia especialmente desenvolvida para obter a resposta pseudo-elástica do trilho para quaisquer posições e áreas de contato. O resultado desse conjunto de simulações é organizado de modo a gerar um mapa, com o qual o ciclo das componentes da tensão pseudo-elástica referente a uma passagem de roda pode ser definido para qualquer condição de contato (dimensão da área de contato, posição e cargas normal, lateral e longitudinal). Utilizando o mapeamento previamente obtido e dados de simulações de dinâmica de multicorpos, o histórico das componentes de tensão pseudo-elástica é calculado. As tensões pseudo-elásticas são então convertidas em elastoplásticas utilizando um algoritmo incremental, proposto originalmente para correção de tensões em entalhes e estendido no presente trabalho para o caso do contato em rolamento. As tensões elastoplásticas são utilizadas para avaliação de falha por Fadiga Multiaxial empregando o modelo de Dang Van. A análise e os resultados foram comparados com os resultados obtidos com um modelo elastoplástico não linear amplamente utilizado na literatura, que emprega o MEF, para um carregamento típico de ferrovias heavy haul. Para a análise comparativa de fadiga, duas abordagens diferentes foram empregadas, uma baseada em tensões e outra em deformações. A comparação do dano calculado com o modelo proposto e com o modelo não linear em MEF mostrou que o modelo desenvolvido é adequado para avaliar a vida em fadiga de trilhos. A principal vantagem do novo modelo em relação a outros modelos presentes na literatura é a de ser rápido sem comprometer a precisão dos resultados. Enquanto o modelo não linear baseado no MEF requer 40 horas de simulação para calcular um ciclo de contato de rolamento, o modelo proposto requer apenas 8 horas de simulação, requerendo apenas alguns segundos adicionais por ciclo para calcular uma resposta elastoplástica completa. Devido à sua rapidez, o modelo proposto viabiliza a obtenção da resposta de tensões para longos históricos de carga em problemas reais Abstract: This work proposes a model for fatigue life evaluation of railroad rails subjected to rolling contact loads which produces results faster than the models currently employed in the literature. The accuracy of the proposed model is high enough for use in multiaxial fatigue analysis and can be adapted for other applications. Initially, the rail is modelled with the Finite Element Method – FEM, considering the linear elastic regime; the load application is done by a coupled analytical and numerical approach. Then, a set of simulations is executed by employing a specially developed strategy to get the pseudo-elastic response of the rail for any position and contact area. This set of pseudo-elastic responses is arranged to generate a map with which the cycle of the pseudo-elastic stress components referring to a wheel passage can be defined for any contact condition (contact dimensions, position, and normal, lateral, and longitudinal loads). Using the previously obtained map, and data from multibody dynamics simulations, the time histories of the pseudo-elastic stress components are calculated. The pseudo-elastic stresses are converted into elastic-plastic stresses by using an incremental algorithm originally proposed for notch root stresses. The approach is extended to the rolling contact problem in this work. The elastic-plastic stresses are used for the multiaxial fatigue analysis by employing the Dang Van fatigue criterion. The analysis and the results of the proposed model were compared with results obtained from a non-linear elastic-plastic model employing FEM, that is widely used in the literature. A typical load case observed in heavy haul railroads is simulated using the non-linear model in FEM and in the proposed model. For the comparative fatigue analysis, two fatigue approaches are used: stress-based and strain-based. The comparison of the damage calculated with the proposed model and with the non-linear model in FEM showed that the proposed model is suitable for evaluating the fatigue life of rails. The main advantage of the new model when it is compared to other models present in the literature, is that it is fast, and the accuracy of the results is not compromised. The non-linear model in FEM requires 40 hours of simulation to calculate one rolling contact cycle. To accomplish the same task, the proposed model requires a set of pseudo-elastic responses which can be obtained in only 8 hours of simulation. The set of pseudo-elastic responses is calculated only once and, additionally, only a few seconds per cycle are needed to calculate the complete elastic-plastic response. Due to the significant reduction in the calculation time, the proposed model enables quick the calculation of long elastic-plastic responses observed in real problems Doutorado Mecânica dos Sólidos e Projeto Mecânico Doutor em Engenharia Mecânica
- Published
- 2022
21. Usina do Trabalho do Ator: the recognition of an identity
- Author
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Eliane Tejera Lisbôa
- Subjects
Usina do Trabalho do Ator (UTA) ,Actor’s Research ,Theatre Anthropology ,Plasticity ,Musicality ,Drama ,PN1600-3307 ,Dramatic representation. The theater ,PN2000-3307 - Abstract
This article describes the main points of the career of the theatre group UTA – Usina do Trabalho do Ator, by making a brief overview of its scenic achievements thus far. We also seek to recognize the more important characteristics of UTA, built and set up along this career, such as the plasticity and musicality of its achievements, dramaturgy itself, a result of the group’s experiments and improvisations, as well as a permanent and careful actor’s research, supported mainly by theatrical anthropology practices.
- Published
- 2012
22. Characteristics of some clay materials from Tamilnadu, India, and their possible ceramic uses Características de algumas argilas de Tamilnadu, India, e seus possíveis usos cerâmicos
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C. Manoharan, P. Sutharsan, S. Dhanapandian, and R. Venkatachalapathy
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argilas aluviais ,argilas vermelhas ,argilas ,plasticidade ,tijolos ,telhas ,alluvial clay ,red clay ,clay ,plasticity ,brick ,tiles ,Engineering (General). Civil engineering (General) ,TA1-2040 - Abstract
X-ray fluorescence, themogravimetric-differential thermal analysis, Fourier Transform Infrared spectroscopy, X-ray diffraction, particle size analysis and Atterberg limits were used to study physico-chemical, mineralogical and thermal properties of two types of clays from four different locations of Tamilnadu, India. The chemical and mineralogical compositions of these clays differ considerably. The mineralogy indicated that the alluvial clays (G1 and G2) comprise highly quartz, illite, kaolinite, plagioclase and small amount of chlorite. The red clays (R1 and R2) were also rich in quartz, well-ordered kaolinite and abundant Fe-bearing minerals such as goethite and hematite. With respect to chemical composition, the G1 and G2 clays contained high amount of SiO2, low amount of Al2O3 and low loss on ignition, however, the R1 and R2 clays contain moderate amount of SiO2, Al2O3, and high amount of Fe2O3 and high loss on ignition. The results indicate that clays from alluvial deposit have adequate characteristics for common brick fabrication. However, clays collected from red clay deposit possessing adequate properties for roofing tile manufacturing and can be used for the manufacturing of common brick with some modification.As técnicas de fluorescência de raios X, análise termogravimétrica-térmica diferencial, espectroscopia no infravermelho com transformada de Fourier, difração de raios X, análise de tamanho de partículas e limites de Atterberg foram utilizadas para o estudo de propriedades físico-químicas, mineralógicas e térmicas de dois tipos de argilas de quatro diferentes localizações em Tamilnadu, India. As composições químicas e mineralógicas dessas argilas diferem consideravelmente. A mineralogia indica que argilas aluviais (G1 and G2) são compostas principalmente de quartzo, ilita, caulinita, plagioclases e pequenas quantidades de cloretos. As argilas vermelhas (R1 and R2) são também ricas em quartzo, caulinita bem ordenada, e minerais abundantes em ferro tais como goetita e hematita. Com relação à composição química, as argilas G1 e G2 contém alto teor de SiO2, baixo teor de Al2O3 e baixa perda ao fogo; as argilas R1 e R2, entretanto, contém teor moderado de SiO2, Al2O3, e alto teor de Fe2O3 e alta perda ao fogo. Os resultados indicam que argilas de depósitos aluviais tem características adequadas para a fabricação de tijolos. Entretanto, as argilas coletadas de depósitos de argilas vermelhas com propriedades adequadas para fabricação de telhas podem ser utilizadas na fabricação de tijolos após algumas modificações.
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- 2012
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23. Palabra y género: Un movimiento dialógico orquestado por la plasticidad y la coercitividad
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Batista, Adriana Danielski
- Subjects
Plasticidade ,Coercitividade ,Plasticity ,Gênero ,Plasticidad ,Coercitividad ,Word ,Gender ,Palabra ,Género ,Coercitivid ,Palavra - Abstract
This article aims to present a theoretical-discursive analysis on the functioning of the word and its relationship with gender in which it appears, highlighting the inseparability of the aspects of plasticity and coercivity. According to Bakhtinian theory, the word constitutes an arena where plasticity is established, but, at the same time, it is confronted by the coerciveness of the genre. It is also registered that there are varying levels of plasticity that permeate the tongue. There are more coercive genres, which impose a more stable discursive functioning on the word, in which the coexistence of different social voices is restrained. In contrast, there are extremely plastic genres, which provide greater mobility to the word, which, in turn, prints malleability to the genre. However, even if the word is essentially plastic, its functioning is always conditioned by gender. In order to demonstrate how these assumptions work in the concrete materiality of the language, possible orientations are presented for the analysis on the functioning of the word and its intimate relationship with gender, having as theoretical scope some of the philosophical and linguistic concepts postulated by Bakhtin and his Circle. Este artículo tiene como objetivo presentar un análisis teórico-discursivo sobre el funcionamiento de la palabra y su relación con el género en el que aparece, destacando la inseparabilidad de los aspectos de plasticidad y coercitividad. Según la teoría bakhtiniana, la palabra constituye un escenario donde se establece la plasticidad, pero, al mismo tiempo, se enfrenta a la coercitividad del género. También se registra que existen diferentes niveles de plasticidad que impregnan la lengua. Hay géneros más coercitivos, que imponen un funcionamiento discursivo más estable a la palabra, en los que se restringe la convivencia de distintas voces sociales. Por el contrario, existen géneros extremadamente plásticos, que otorgan mayor movilidad a la palabra, que, a su vez, imprime maleabilidad al género. Sin embargo, aunque la palabra sea esencialmente plástica, su funcionamiento siempre está condicionado por el género. Con el fin de demostrar cómo funcionan estos supuestos en la materialidad concreta del lenguaje, se presentan posibles orientaciones para el análisis sobre el funcionamiento de la palabra y su íntima relación con el género, teniendo como alcance teórico algunos de los conceptos filosóficos y lingüísticos postulados por Bakhtin y su círculo. Este artigo tem como objetivo apresentar uma análise teórico-discursiva sobre o funcionamento da palavra e sua relação com gênero em que figura, ressaltando a indissociabilidade dos aspectos plasticidade e coercitividade. De acordo com a teoria bakhtiniana, a palavra constitui uma arena onde a plasticidade se instaura, mas, ao mesmo tempo, é confrontada pela coercitividade do gênero. Registra-se, ainda, que existem variados níveis de plasticidade que perpassam a língua. Há gêneros mais coercitivos, que impõem à palavra um funcionamento discursivo mais estável, em que a coexistência de diferentes vozes sociais são coibidas. Em contrapartida, existem gêneros extremamente plásticos, os quais propiciam maior mobilidade à palavra, que, por sua vez, imprime maleabilidade ao gênero. No entanto, mesmo que a palavra seja essencialmente plástica, seu funcionamento sempre é condicionado pelo gênero. Para demonstrar como esses pressupostos funcionam na materialidade concreta da língua, são apresentados possíveis orientações para a análise sobre o funcionamento da palavra e sua íntima relação com o gênero, tendo como escopo teórico alguns dos conceitos filosóficos e linguísticos postulados por Bakhtin e seu Círculo.
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- 2021
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24. Modelo matemático aplicado ao processo de extrusão de argilas Mathematical model applied to the process of clay extrusion
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F. A. Andrade, H. A. Al-Qureshi, and D. Hotza
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argila ,extrusão ,plasticidade ,modelamento ,clay ,extrusion ,plasticity ,modeling ,Engineering (General). Civil engineering (General) ,TA1-2040 - Abstract
As argilas, quando misturadas com água, adquirem a propriedade chamada plasticidade que tem papel fundamental durante o seu processamento. As técnicas empregadas na caracterização da plasticidade muitas vezes não revelam resultados quantitativos que permitam sua aplicação em modelos matemáticos do processo de conformação das argilas. Este trabalho teve por objetivo desenvolver um modelo matemático para cálculo da pressão média de extrusão, avaliando a plasticidade através de ensaios de compressão. Em seguida, os resultados teóricos da pressão de extrusão foram comparados aos resultados experimentais, sendo encontrado um bom acordo entre eles. Foi possível observar uma correlação entre tensão efetiva de compressão e pressão de extrusão. Para a equação que modela o processo de extrusão, a tensão efetiva obtida pelo ensaio de compressão foi um parâmetro significativo que revela o comportamento da argila durante o seu processamento.The clays when mixed with water acquire the property known as plasticity, which plays a key role during processing. The techniques used to characterize the plasticity often do not show quantitative results that allow its application in mathematical models of the forming process of clays. This study aimed to develop a mathematical model for calculating the average pressure of extrusion, evaluating the plasticity through compression tests. Then, the theoretical results of the extrusion pressure were compared to experimental results and a good agreement was found between them. It was possible to observe a correlation between effective stress of compression and extrusion pressure. For the extrusion process modeling equation, the effective stress obtained by compression test was a significant parameter that reveals the behavior of the clay during processing.
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- 2011
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25. A simple method for non-linear analysis of steel fiber reinforced concrete - 10.4025/actascitechnol.v32i4.7249
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Leandro Vanalli, Rodrigo Ribeiro Paccola, Mario Rogerio Scoaris, and Humberto Breves Coda
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SFRC ,FEM ,plasticity ,Engineering (General). Civil engineering (General) ,TA1-2040 ,Science (General) ,Q1-390 - Abstract
This paper proposes a physical non-linear formulation to deal with steel fiber reinforced concrete by the finite element method. The proposed formulation allows the consideration of short or long fibers placed arbitrarily inside a continuum domain (matrix). The most important feature of the formulation is that no additional degree of freedom is introduced in the pre-existent finite element numerical system to consider any distribution or quantity of fiber inclusions. In other words, the size of the system of equations used to solve a non-reinforced medium is the same as the one used to solve the reinforced counterpart. Another important characteristic of the formulation is the reduced work required by the user to introduce reinforcements, avoiding "rebar" elements, node by node geometrical definitions or even complex mesh generation. Bounded connection between long fibers and continuum is considered, for short fibers a simplified approach is proposed to consider splitting. Non-associative plasticity is adopted for the continuum and one dimensional plasticity is adopted to model fibers. Examples are presented in order to show the capabilities of the formulation.
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- 2010
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26. A simple method for non-linear analysis of steel fiber reinforced concrete = Um método simples para a análise não-linear de concreto reforçado com fibras de aço
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Leandro Vanalli, Rodrigo Ribeiro Paccola, Mario Rogerio Scoaris, and Humberto Breves Coda
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SFRC ,FEM ,plasticity ,concreto reforçado com fibras ,método dos elementos finitos ,plasticidade ,Engineering (General). Civil engineering (General) ,TA1-2040 ,Science (General) ,Q1-390 - Abstract
This paper proposes a physical non-linear formulation to deal with steel fiber reinforced concrete by the finite element method. The proposed formulation allows the consideration of short or long fibers placed arbitrarily inside a continuum domain (matrix). The most important feature of the formulation is that no additional degree offreedom is introduced in the pre-existent finite element numerical system to consider any distribution or quantity of fiber inclusions. In other words, the size of the system of equations used to solve a non-reinforced medium is the same as the one used to solve thereinforced counterpart. Another important characteristic of the formulation is the reduced work required by the user to introduce reinforcements, avoiding "rebar" elements, node by node geometrical definitions or even complex mesh generation. Bounded connectionbetween long fibers and continuum is considered, for short fibers a simplified approach is proposed to consider splitting. Non-associative plasticity is adopted for the continuum and one dimensional plasticity is adopted to model fibers. Examples are presented in order to show the capabilities of the formulation.Este artigo apresenta uma formulação baseada no Método dos Elementos Finitos (MEF), para a análise física não-linear de estruturas de concreto reforçadas com fibras de aço. A formulação proposta permite a consideração de fibras curtas e longas inseridas num meio contínuo. A mais importante característica da formulação é que nenhum grau de liberdade adicional é introduzido no sistema de equações que modela oproblema, independente da quantidade e da forma de distribuição das fibras. Em outras palavras, o tamanho do sistema de equações para resolver o problema de reforço com fibras é o mesmo do problema sem reforço. Uma outra importante característica da formulação é o reduzido trabalho requerido para a inserção das fibras, evitando-se o uso de elementos rebar, comuns em pacotes comerciais, ou qualquer readequação de malha. É considerada ainda a conexão entre diferentes tipos de fibras (curtas e longas) e uma simplificada aproximação para a consideração de escorregamento das fibras é proposta. Plasticidade nãoassociativa é adotada para a modelagem do meio (matriz) e para as fibras unidimensional. Exemplos são apresentados para mostrar a potencialidade da formulação proposta.
- Published
- 2010
27. Visual Impairment and Cerebral Plasticity in the Human Brain
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Maria Luíza Rangel, Luísa Azevedo Damasceno, Carlos Alberto Ismério dos Santos Filho, Felipe Santos de Oliveira, Fernanda Jazenko, Luiz G. Gawryszewski, and Antonio Pereira
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blindness ,plasticity ,touch ,motor control ,audition ,Psychology ,BF1-990 - Abstract
Humans are able to analyze the world through information derived from various sensory modalities. After the loss of a given sense, anatomical, physiological and behavioral studies have shown that compensatory plastic changes take place in the cortex, first through the unmasking of synaptic contributions from other modalities, even in primary sensory areas. This fact underscores the metamodal theory of sensory cortical function and can be used to devise effective strategies to train the blind to compensate their loss through better use of the remaining sensory modalities.
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- 2010
28. Influence of shade on the biomass and essential oil production of Lippia citriodora (Lam.), Brazil
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Ernane Ronie Martins, Wellington Geraldo Oliveira Carvalho Junior, Lourdes Silva de Figueiredo, Ismail Teodoro de Souza Júnior, Paula Alessandra Gomes, and Manoel Ferreira de Souza
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medicinal plants ,plasticity ,radiation ,Science ,Biology (General) ,QH301-705.5 - Abstract
This study aimed to evaluate the effect of shading on the production of essential oil and biomass in Lippia citriodora (Lam.) – known as cidrão – in the north of Minas Gerais, Brazil. The experimental design was completely randomized, with four treatments and five repetitions. The treatments consisted of four levels of photosynthetically-active radiation (PAR) using “Sombrite” black shade netting of 25, 50, 70% of light and full sunlight as the control. The variables root dryness, shoot dryness, number of flowers, total dry weight, root/shoot ratio, and production and content of essential oil were analyzed. Statistically significant differences were observed for the root and shoot dry masses and total dry mass, number of flowers, total dry weight, root/shoot ratio, oil production and trichome number, but not for the oil content. The results showed that at full sunlight the biomass production and trichome number of cidrão were altered, but that the content of essential oil was unaffected.
- Published
- 2009
29. Cambios anatómicos y morfológicos en plántulas de Eucalyptus sp. en respuesta a diferentes niveles de luz Anatomical and morphological changes in Eucalyptus sp. seedlings in response to different levels of light
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Ana B. Guarnaschelli, Anita I. Mantese, and Anabela Battaglia
- Subjects
Eucalyptus ,Sombra ,Aclimatación ,Plasticidad ,Morfología ,Anatomía foliar ,Shade ,Acclimation ,Plasticity ,Morphology ,Leaf anatomy ,Science ,Botany ,QK1-989 - Abstract
Se evaluaron respuestas en la anatomía y morfología de plántulas de Eucalyptus globulus subesp. globulus, Eucalyptus grandis y Eucalyptus camaldulensis creciendo bajo diferentes niveles de luz. Las plantas fueron expuestas a tres regímenes de iluminación: pleno sol (C), 50 % (S50) y 75% de restricción lumínica (S75) y regadas diariamente. Se midieron características morfológicas y anatómicas del follaje, se calcularon coeficientes foliares e índices de plasticidad. Al disminuir la disponibilidad lumínica, las plantas mostraron cambios asociados a la aclimatación a la sombra. Se observaron aumentos en el área foliar y en los coeficientes foliares. Paralelamente se detectaron disminuciones en el espesor de las hojas, de la epidermis, del parénquima en empalizada y en la densidad de estomas. La biomasa foliar y la biomasa total diminuyeron significativamente bajo el nivel S75. El aumento en el nivel de restricción lumínica produjo cambios proporcionales en el espesor de hojas y en el coeficiente de área foliar. Independientemente del nivel de sombra, se detectaron diferencias entre especies, que podrían asociarse a las condiciones ambientales de sus áreas de origen. Si bien se observaron algunas diferencias en los índices de plasticidad, los valores promedio de las tres especies fueron similares. Esto sugiere que, para los caracteres considerados en este estudio, el grado de aclimatación a la sombra fue similar.Responses in the anatomy and morphology of Eucalyptus globulus subsp. globulus, Eucalyptus grandis and Eucalyptus camaldulensis seedlings, growing under different levels of light were evaluated. Seedlings were submitted to three levels of irradiance: full sun (C), 50% (S50) and 75% of light restriction (S75) and irrigated daily. Morphological and anatomical characteristics were measured; foliar coefficients and indexes of plasticity were calculated. As light availability diminished, plants showed changes associated with shade acclimation. Increases in leaf area and in leaf coefficients were observed. At the same time, decreases in the thickness of leaves, epidermis, palisade parenchyma, and in the stomatal density were detected. Leaf dry mass and total dry mass decreased under the level S75. The increase in the level of light restriction produced proportional changes in leaf thickness and in leaf area ratio. Irrespective of the level of shade, some differences among the three species were observed, which could be associated with the environmental conditions of their native areas. Although some differences in the plasticity indexes were observed, average values for the three species were similar. This suggests that, for the characteristics considered in this study, the degree of shade acclimation was similar.
- Published
- 2009
30. Influência de aditivos na produção de blocos cerâmicos Influence of additives on the production of ceramic bricks
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R. S. Macedo, R. R. Menezes, G. A. Neves, and H. C. Ferreira
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blocos cerâmicos ,plasticidade ,aditivos ,extrusão ,ceramic bricks ,plasticity ,additives ,extrusion ,Engineering (General). Civil engineering (General) ,TA1-2040 - Abstract
A indústria oleira nacional possui uma grande importância econômica e social, movimentando bilhões de reais e empregando milhões de pessoas. No entanto, apresenta uma grande defasagem tecnológica, o que se reflete na produção de peças de baixa qualidade e em uma grande quantidade de perdas na produção. Assim, visando melhorar a qualidade dos blocos cerâmicos esse trabalho tem por objetivo analisar a influência de aditivos no comportamento de plasticidade de massas para produção de blocos cerâmicos e nas propriedades físicas dos corpos produzidos com as massas aditivadas. Foram utilizados cinco massas industriais e dez aditivos durante o estudo. Foi analisada a influência dos aditivos nos limites de Atterberg das massas e selecionados os aditivos que reduziam os limites de plasticidade. Foram preparadas formulações com os aditivos selecionados e conformados corpos de prova por extrusão. Determinou-se o módulo de ruptura à flexão após secagem e queima e a absorção de água após queima desses corpos de prova. Com base nos resultados pode-se concluir que alguns aditivos reduzem o limite de plasticidade das massas e melhoram significativamente o comportamento mecânico após secagem e após queima.The Brazilian ceramic brick industry has an important economic and social role, with a billionaire market and generating millions of jobs. However, this industry presents an outdated technology, which causes the production of low quality bodies and high production losses. Objecting improve the quality of ceramic brick this work evaluated the influence of additives on the plasticity of formulations used for the production of ceramic bricks and on the physical properties of samples produced with additive formulations. Five formulations and ten additives were studied. The influence of additives on the Atterberg limits was analyzed. Additives that reduced the plasticity limit were selected, formulations were produced and test specimens were obtained by extrusion. The flexural strength of the dried and fired bars was measured. The water absorption of the fired bars was also determined. The results indicated that some additives could be used to reduce the formulations plasticity limit and improve the flexural strength.
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- 2008
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31. O REGIME AUTOGRÁFICO: A NEGOCIAÇÃO ENTRE A NARRAÇÃO E A PLASTICIDADE NOS QUADRINHOS.
- Author
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da Silva Ramos Carneiro, Maria Clara
- Abstract
Copyright of Esferas is the property of Esferas and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2016
32. O DEVIR-DEFICIENTE DA PEDAGOGIA: NOTAS PARA UMA ANTROPOLOGIA FILOSÓFICO-EDUCACIONAL DA PLASTICIDADE.
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Freitas, Alexandre Simão
- Abstract
This essay discusses the formative processes while antropotechnic processes. The expectation is to contribute for the debate about the meanings inherent in speeches that promote and disseminate multiple devices for inclusion of differences. The central argument defends that the abandonment of reflection on the notion of plasticity has deprived the philosophy of education to think the exposure processes of lives that do not allow themselves to double the existing normative codes, hiding a possible becoming deficient's own pedagogy. The becoming-deficient pedagogy goes through expressive manifestations of the life forms that explode and are made disaster. Plasticity is configured so as a condition of possibility and as a threat to domesticating humanism. Following the reflections of Peter Sloterdijk and Catherine Malabou, plasticity is thought of as an indication that all human life is an unavoidable accident, and disability only a limit on biopolitics attempts to reconstruct an ideal or totalizing model of the human. Disabled people can save some disturbing lessons about our pedagogical maxims. The becoming-deficient pedagogy points an ethical-political will to think about human development beyond the notion of perfectibility, jeopardizing one of the esoteric secrets of Western pedagogical reflection. [ABSTRACT FROM AUTHOR]
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- 2016
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33. Biogeografia e variação morfológica foliar do gênero Passiflora L. (Passifloraceae s.s.) sob variáveis ambientais na Floresta Atlântica, Brasil
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Moraes, Andreza Magro, Faria, Ana Paula Gelli de, Milward-de-Azevedo, Michaele Alvim, Carvalho , Fabrício Alvim, Pires, Ana Carolina Mezzonato, Oliveira, Marcelo Trovó Lopes de, Bernacci , Luís Carlos, and Zorzanelli , João Paulo Fernandes
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Plasticidade ,CIENCIAS BIOLOGICAS [CNPQ] ,Climbers ,Plasticity ,Taxonomia ,Lianas ,Environmental gradient ,Gradiente ambiental ,Passionflowers ,Maracujás - Abstract
Passiflora L. está amplamente distribuída nos biomas brasileiros, e no sudeste da Floresta Atlântica é registrada com expressiva riqueza. O gênero também se destaca pela grande plasticidade morfológica foliar observada em várias espécie que pose ser relacionado a fatores abióticos, porém são poucos estudos sobre a relação. O estudo foi todo conduzido no domínio Atlântico. Realizamos um estudo biogeográfico do gênero Passiflora na região da Serra da Mantiqueira (SM), que buscou investigar a distribuição em um gradiente ambiental a partir dos dados de campo e de coleções botânicas (online e herbários). Foram empregadas análises espaciais de riqueza e esforço amostral e similaridade por área e altitude/fitofisionomia utilizando softwares de georreferenciamento e o programa R, a partir de quadriculas de 2,5º × 2,5º. Avaliamos a riqueza/ocorrencia das espécies por altitude através de um teste de significância e estado conservação das espécies na área sobrepondo a riqueza com shapefile de UC. Também investigamos a influência de variáveis ambientais na morfologia foliar de cinco espécies de Passiflora caracterizadas por expressiva plasticidade, tanto em escala regional (UC: Parque Nacional do Caparaó - PNC, Parque Nacional do Itatiaia - PNI, Parque Nacional da Serra dos Órgãos - PARNASO, Parque Estadual Serra do Brigadeiro – PESB e Parque Estadual do Ibitipoca - PEIB) quanto em macro escala (domínio Atlântico). A partir de uma análise morfométrica das folhas, os caracteres foliares foram relacionadas com dados abióticos (clima, solo, altitude e luz) obtidos para cada espécime. Foi empregado uma análise de Escalonamento Multidimensional Não-Métrico (NMDS) utilizando o índice de Gower, para avaliar a relação das variáveis ambientais com a morfologia geral das folhas e modelos mistos lineares (GLMM) para caracteres individuas das folhas. Com estudo de biogeografia, obtivemos 50 espécies ocorrentes na SM e concluímos que a composição de Passiflora muda ao longo do gradiente de altitude por classes de altitude, e atinge maior riqueza a 1000 m de elevação em fitofisionomias do tipo montana. E a composição das espécies é diferente entre as duas porções da SM, norte e sul. Nossos resultados sobre variação foliar indicaram relações significativas entre fatores climáticos e edáficos com a morfologia geral, caracteres individuais de tamanho e as características de defesa (nectários extraflorais e variegações) das folhas. As espécies P. campanulata, P. amethystina e P. porophylla apresentaram maior resposta às variáveis ambientais, se diferenciando por população. Devido a grande diferenciação encontrada nas folhas de P. campanulata, somado a diferença de caracteres reprodutivos, sugerimos a descrição de uma nova espécie da P. seção Dysosmia, coletada no PNC, na porção norte da SM. Com nossos resultados, ampliamos o conhecimento sobre a biologia, ecologia e taxonomia das espécies de Passiflora, padrões de distribuição e conservação do gênero na SM. E trazemos uma nova perspectiva em sobre a plasticidade foliar neste gênero, refletindo, além de tudo, os gradientes climáticos e edáficos. Passiflora L. is widely distributed in Brazilian biomes, particularly in the southeast of the Atlantic Forest where it is recorded with expressive richness. Although the genus stands out for the great leaf morphological plasticity (possibly related to abiotic factors), there are few studies about it. This study was all performed within the Atlantic domain. The biogeographic study of the Passiflora genus was carried in the region of Serra da Mantiqueira (SM) to investigate its distribution in an environmental gradient based on field data and botanic collections (online and herbaria). We employed a spatial analysis of richness, sampling effort, and similarity by area and altitude/physiognomy out using georeferencing software and the R program, from 2.5º × 2.5º grids. We evaluated species richness/occurrence by altitude through a test of significance and species conservation status in the area by overlaying the richness with the shapefile of studied Conservation Unit (UC). We also investigated the influence of environmental variables on the leaf morphology of five Passiflora species (P. amethystina, P. campanulata, P. capsularis, P. mediterranea and P. porophylla) on the regional scale (UC: Caparaó National Park - PNC, Itatiaia National Park - PNI, Serra dos Órgãos National Park - PARNASO, Serra do Brigadeiro State Park – PESB, and Ibitipoca State Park - PEIB), and macro-scale (Atlantic domain). The morphometric analysis showed that the leaf characters were related to abiotic factors (climate, soil, altitude, and light) obtained for each specimen on the field. We used a Non-Metric Multidimensional Scaling (NMDS) analysis with the index Gower to evaluate the relationship of environmental variables with general leaf morphology, and Linear Mixed Models (GLMM) to evaluate the relationship of environmental variables with individual leaf characters. In the biogeography study, we obtained 50 species recorded for the SM and concluded that the composition of Passiflora changes along the altitude gradient, and reaches greater richness at 1000 m of elevation in the montane type phytophysiognomies. The species composition is different between the two portions of the SM: north and south. Our results on leaf variation indicated significant relationships between climatic and edaphic factors with the general morphology, individual characters of size, defense characteristics (extrafloral nectaries and variegations), and shape of leaves. The species P. campanulata, P. amethystina and P. porophylla showed greater response to environmental variables differing by population. Due to the great differentiation found in the leaves and reproductive characters of P. campanulata, we suggest the description of a new species of P. section Dysosmia collected in the PNC, in the northern portion of the SM. Our results amplified the knowledge about the biology, ecology and taxonomy of Passiflora species, distribution patterns, and conservation of the genus in SM. Above all, we bring a new perspective on the leaf plasticity of Passiflora discussing the influence of climatic and edaphic gradients on this.
- Published
- 2021
34. Physical and mechanical properties of ceramics from clays of the west of S. Paulo State, Brazil Propriedades físicas e mecânicas de cerâmicas conformados com argilas do Oeste do Estado de S. Paulo, Brasil
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S. R. Teixeira, S. A. de Souza, and M. A. L. Nobre
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argilas ,corpos cerâmicos ,propriedades mecânicas ,resistência ,plasticidade ,clays ,ceramic bodies ,mechanical properties ,strength ,plasticity ,Engineering (General). Civil engineering (General) ,TA1-2040 - Abstract
Clays and ceramics of interest to the structural ceramic industry were characterized. Some physical properties of ceramic masses formulated from artificial deposits exploited by the local industry were also analyzed. All materials investigated exhibit high contents of fine components (< 2 mum) and significant plasticity that is compatible with the presence of a great amount of clay minerals. Ceramic probes were prepared by dry pressing and fired at around 855 °C. Flexural strength, linear shrinkage, water absorption, apparent color and weight loss were measured. In addition, the industrial applications of these raw materials were reviewed and newest potential uses proposed.Argilas de interesse da indústria de cerâmica estrutural foram caracterizadas. Algumas propriedades físicas de diversas massas cerâmicas, preparadas a partir de material coletado em depósitos artificiais, também foram analisadas. Todas as massas investigadas exibem alta concentração de componentes finos (< 2 mim) e considerável grau de plasticidade, o que é compatível com a presença de elevado teor de argilominerais. Corpos de prova cerâmicos foram preparados por prensagem a seco e queimados em temperaturas ao redor de 855 °C. Os parâmetros resistência mecânica à flexão, retração linear, absorção de água, cor aparente e perda de peso foram medidos. Como resultado, as aplicações industriais destas matérias primas foram analisadas e revistas, bem como novas aplicações foram propostas.
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- 2004
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35. Sincronização de disparos em redes neuronais com plasticidade sináptica.
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Borges, Rafael R., Iarosz, Kelly C., Batista, Antonio M., Caldas, Iberê L., Borges, Fernando S., and Lameu, Ewandson L.
- Abstract
In this paper, we investigated the neural spikes synchronisation in a neural network with synaptic plasticity and external perturbation. In the simulations the neural dynamics is described by the Hodgkin Huxley model considering chemical synapses (excitatory) among neurons. According to neural spikes synchronisation is expected that a perturbation produce non synchronised regimes. However, in the literature there are works showing that the combination of synaptic plasticity and external perturbation may generate synchronised regime. This article describes the effect of the synaptic plasticity on the synchronisation, where we consider a perturbation with a uniform distribution. This study is relevant to researches of neural disorders control. [ABSTRACT FROM AUTHOR]
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- 2015
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36. Study of cure process and properties of a termoset from epoxy and isophorone diamine modified with the renewable plasticizer 1,2-isopropylideneglycerol
- Author
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Molinari, Caio Cesar Silveira, 1986, Morales, Ana Rita, 1958, Oliveira, Marcos Fernandes, Almeida Neto, Ambrósio Florêncio de, Universidade Estadual de Campinas. Faculdade de Engenharia Química, Programa de Pós-Graduação em Engenharia Química, and UNIVERSIDADE ESTADUAL DE CAMPINAS
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Plasticidade ,Corrosion ,Degradacão de polímeros ,Corrosão ,Plasticity ,Coatings ,Polymers - Degradation ,Photodegradation ,Fotodegradação ,Tintas - Abstract
Orientador: Ana Rita Morales Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Química Resumo: Neste trabalho foi estudada a aplicação de um plastificante de fonte renovável na formulação de um sistema convencional epoxídico para tintas. O éter diglicidílico de bisfenol A (DGEBA) foi reagido com isoforona diamina (IPDA) em uma razão estequiométrica de 1:1. Dois plastificantes foram utilizados para diluir a amina, 1,2-isopropilidenoglicerol (fonte renovável) e álcool benzílico (convencional), em duas concentrações, em comparação com o sistema sem plastificante. A reação de cura foi realizada isotermicamente em um equipamento de Calorimetria diferencial exploratória (DSC) a 40 °C por 12 horas. As amostras curadas nesta temperatura mostraram tendência a vitrificar antes da cura completa. Ambos os plastificantes reduziram a temperatura de transição vítrea e aumentaram o grau de cura do sistema. Formulações de vernizes preparados com as amostras foram aplicadas em um substrato com uma base branca e medidas de cor foram tomadas antes e depois de 1600 horas de intemperismo natural. A amostra preparada com o plastificante 1,2-isopropilidenoglicerol mostrou menor progressão de amarelamento causado por foto-oxidação. Os vernizes preparados com as amostras também foram aplicados diretamente em chapas de aço-carbono, e medidas de espectroscopia de impedância eletroquímica foram feitas para análise de resistência anticorrosiva. A presença de plastificante na formulação foi significativa para a obtenção de maior resistência anticorrosiva sendo que, o plastificante de fonte petroquímica foi superior. Portanto, o diluente derivado de fonte renovável, 1,2-isopropiledenoglicerol pode ser considerado uma alternativa ambientalmente amigável ao diluente de fonte petroquímica, álcool benzílico Abstract: In this work, the application of a renewable plasticizer in the formulation of a conventional epoxy system for application in coatings was studied. Diglycidyl ether of bisphenol A (DGEBA) was reacted with isophorone diamine (IPDA) to ensure a 1:1 stoichiometric ratio. Two plasticizers were used to dilute the amine, 1,2-isopropylideneglycerol (renewable) and benzyl alcohol (conventional) in two different ratios, compared to the system without plasticizer. The curing reaction was performed isothermally in a DSC equipment at 40 °C for 12 hours. The systems cured at low temperatures tended to vitrify before complete cure and both plasticizers reduced its glass transition temperature and increased cure degree. Clear coat formulations prepared with the samples were applied in a white substrate, and color measurements were taken before and after 1600 hours of natural weathering. The samples with 1,2-isopropylideneglycerol have shown a lower yellowing progression caused by photo-oxidation. The clear coats prepared with the samples were also applied directly to carbon steel sheets, and electrochemical impedance spectroscopy measurements were made for the anti-corrosion resistance analysis. The presence of plasticizer has shown an impact to obtain higher anticorrosive resistance, however the petrochemical plasticizers presented a better performance. Nevertheless, the diluent derived from a renewable source, 1,2-isopropylideneglycerol, can be considered an environmentally friendly alternative to the diluent from a petrochemical source, benzyl alcohol Mestrado Engenharia Química Mestre em Engenharia Química
- Published
- 2021
37. Adaptive leaf strategies of Miconia nervosa (Melastomataceae) in Amazon of Mato Grosso state
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Angelica Oliveira Müller, Andréia Aparecida Franco, Eliana Gressler, Norberto Gomes Ribeiro Júnior, Ivone Vieira da Silva, and Vera Lúcia Pegorini Rocha
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0106 biological sciences ,condições ambientais ,QH301-705.5 ,plasticidade ,Botany ,sub-bosque ,Plant Science ,luminosidade ,Horticulture ,acclimation ,010603 evolutionary biology ,01 natural sciences ,environmental conditions ,aclimatação ,understory ,QK1-989 ,plasticity ,luminosity ,Biology (General) ,010606 plant biology & botany - Abstract
Resumo A plasticidade fenotípica geralmente observada em caracteres morfológicos e anatômicos foliares pode ser influenciada por diversos fatores, como luminosidade, disponibilidade de nutrientes no solo, umidade e herbivoria, entre outros. Testamos essa plasticidade em Miconia nervosa (Melastomataceae) em um fragmento florestal no sul da Amazônia, Mato Grosso - Brasil, buscando verificar possíveis estratégias de aclimatação morfoanatômica à luminosidade. Coletamos folhas totalmente expandidas de 15 indivíduos adultos expostos diretamente à luz solar, nas margens de um lago, e 15 sob o sombreamento do dossel. Avaliamos quantitativamente oito variáveis morfológicas e seis anatômicas, das quais seis e quatro, respectivamente, diferiram significativamente entre folhas de sol e sombra. Morfologicamente, as folhas de sol apresentaram maior tamanho da lâmina foliar e do pecíolo e, anatomicamente, células epidérmicas com paredes levemente mais espessadas, maiores densidades e índice estomático. Folhas de sombra apresentaram epiderme significativamente mais espessa em ambas as faces. As folhas de M. nervosa apresentaram grau mediano a alto de plasticidade nas variáveis morfoanatômicas conforme índice de plasticidade fenotípica, com caracteres mistos de ambientes de sol e sombra. Sugerimos que a distribuição dos indivíduos de M. nervosa na floresta está relacionada à disponibilidade de luz e umidade do solo. Abstract The phenotype plasticity usually observed in morphological and anatomical leaf traits may be influenced by several factors, such as luminosity, soil nutrient availability, humidity and herbivory, among others. We tested leaf plasticity in Miconia nervosa (Melastomataceae) in a forest fragment in Southern Amazonia, Mato Grosso State - Brazil, seeking to verify morpho-anatomical strategies of light acclimation. We collected fully expanded leaves of 15 individuals exposed directly to sunlight, on a lake edge, and 15 under canopy shading. We evaluated quantitatively eight morphological variables and six anatomical variables, of which six and four, respectively, differed significantly between sun and shade leaves. Morphologically, sun leaves showed larger leaf and petiole sizes and anatomically, epidermal cells with slightly thickened walls, higher stomatal index and density. Shade leaves showed significantly thicker epidermis on both leaf faces. Leaves of M. nervosa exhibited medium to high degree of plasticity in morpho-anatomical traits, according to the plasticity index, with mixed characteristics of sun and shade environments. We suggest that the distribution of M. nervosa individuals in the forest is related to the availability of light and soil moisture.
- Published
- 2020
38. PLASTICIDADE E PESSOALIDADE NO ESPIRITISMO CRIOULO CUBANO.
- Author
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Espírito Santo, Diana
- Abstract
Copyright of Mana (01049313) is the property of Contra Capa Livraria and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2014
- Full Text
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39. As viagens no tempo nos contos de Sergio Buarque de Holanda e de Prudente de Moraes, neto
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D'Avila, Leonardo
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Plasticity ,Plasticidade ,Fiction ,Surrealismo ,Anacronia ,Anachronism ,Ficção ,Surrealism - Abstract
This article investigates the first surrealist avant-garde expressions in Brazil, from the short stories F-1 (1923) and As mortes de Nero: ou o perigo das deduções (1924), written respectively by Sergio Buarque de Holanda and Prudente de Moraes, neto, the editors of Estética (1924-1925) modernist review. Based on the scientific fiction The Time Machine by G. H Wells, both authors surpass the verisimilitude and structure of the narrative to create authentic time-travel fictions outside of science, in which a certain anachronism between present, past and future, stands out, as well as they both discuss the shock of avant-garde invention before public opinion. By the analysis of the short stories and the contexts of their publication that these early surrealist experiences cannot be understood as mere adherences to a certain poetics, such as that of André Breton’s manifestos, but come from a plural aesthetic and a considerable heterogeneity of ideas. O artigo investiga as primeiras manifestações das vanguardas surrealistas no Brasil, a partir dos contos F-1, de 1923, e As mortes de Nero: ou o perigo das deduções, de 1924, escritos respectivamente por Sergio Buarque de Holanda e Prudente de Moraes, neto, os editores da revista modernista Estética (1924-1925). Baseados na ficção científica The Time Machine de G. H. Wells, ambos os autores rompem com a verossimilhança e com a estrutura da narrativa para produzir autênticas ficções fora da ciência sobre viagens no tempo, nas quais sobressaem certa anacronia entre presente, passado e futuro, além de discussões sobre o choque da invenção vanguardista perante a opinião pública. Podese perceber com as análises dos contos e de seus contextos de publicação que essas primeiras experiências surrealistas não podem ser compreendidas como meras adesões a determinada poética, como a dos manifestos de André Breton, senão que advêm de uma estética plural e de uma considerável heterogeneidade de ideias.
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- 2020
40. Abordagem estatística e experimental para a determinação do dano em concreto sob altas temperaturas
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Souza, Leovegildo Douglas Pereira de, Azerêdo, Givanildo Alves de, and Roehl, Deane de Mesquita
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Plasticidade ,Heating ,Relação constitutiva ,Plasticity ,Aquecimento ,Thermal damage ,Deformation of concrete ,Constitutive model ,Dano térmico ,ENGENHARIAS::ENGENHARIA CIVIL [CNPQ] ,Deformação do concreto - Abstract
Concrete is widely used in various applications around the world. The equation of how it behaves, especially the relationship between stresses and strains, is very important for the development and improvement of the use of the material. When subjected to high temperatures, concrete, presents a complex behavior, with altered mechanical properties, constitutive relationship, crystallographic phases, chemical structure, etc. There are in the literature several constitutive models for concrete subjected to the most different types of mechanical actions, models for concrete subjected to high temperatures and few models that try to evaluate the mechanical and thermal actions together. This work starts of a formulation of the mechanics continuous damage with plasticity and, using experimental data from simple compression tests and with cyclic loads in cylindrical specimens 50 x 100 mm, promotes the mathematical formulation of the development of the damage parameter (), representing the variation of [], as a function of the variables of temperature () and maximum deformation experienced (). In methodological terms, it involves obtaining curves for concrete subjected to different temperatures, checking mechanical properties and set up a database. Therefore, using statistical regression methods, the mathematical model found describes the constitutive relationship of (, ) with a coefficient of statistical determination of 96.81%. Thermogravimetry and acid attack tests were also carried out in order to elucidate the chemical and microstructural changes that reflect sensitive mechanical changes in the compression tests and thus compose a spectrum of cause and effect among the variables involved. In the end, the statistical model is compared in an adapted way with other models in the literature. Nenhuma O concreto possui largo uso em várias aplicações ao redor do mundo ao longo dos tempos. O equacionamento de como se comporta, especialmente a relação entre tensões e deformações, é deveras importante para o desenvolvimento e aperfeiçoamento do uso do material. Quando submetido a altas temperaturas, o concreto, por sua vez, apresenta um comportamento complexo, tendo alteradas suas propriedades mecânicas, relação constitutiva, fases cristalográficas, estrutura química, etc. Existem na literatura diversos modelos constitutivos para o concreto submetido aos mais diferentes tipos de ações mecânicas, modelos para o concreto submetido a altas temperaturas e poucos modelos que tentam avaliar conjuntamente as ações mecânicas e térmicas. Este trabalho parte de uma formulação da mecânica do dano contínuo com plasticidade e, utilizando dados experimentais de ensaios de compressão simples e com cargas cíclicas em corpos de prova cilíndricos 50 x 100 mm, promove a formulação matemática do desenvolvimento do parâmetro de dano (), representando a variação de [], em função das variáveis de temperatura () e deformação máxima experimentada (). Em termos metodológicos, trata-se de obter curvas x para o concreto submetidos a diferentes temperaturas, aferir propriedades mecânicas e montar um banco de dados. Por conseguinte, utilizando métodos de regressão estatística, o modelo matemático encontrado descreve a relação constitutiva de (, ) com coeficiente de determinação estatística de 96,81%. Foram realizados ainda ensaios de termogravimetria e ataque ácido a fim de elucidar as alterações químicas e microestruturais que refletem alterações mecânicas sensíveis nos ensaios de compressão e, assim, compor um espectro de causa e efeito entre as variáveis envolvidas. Ao final, o modelo estatístico é comparado de forma adaptada com outros modelos existentes na literatura.
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- 2020
41. Uma estrutura variacional para materiais inelásticos com anisotropia induzida por deformacão
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Bresolin, Francisco Luiz and Vassoler, Jakson Manfredini
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Damage ,Plasticity ,Viscosity ,CODF ,Variational ,Anisotropia ,Propriedades mecânicas dos materiais ,Simulação numérica ,Deformation-induced anisotropy - Abstract
Diferentes materiais, em especial materiais poliméricos sintéticos ou naturais, apresentam uma forte tendência ao acúmulo de comportamentos inelásticos com direções preferenciais. Como exemplos de materiais com respostas anisotrópicas, oriundas do acúmulo de inelasticidade, podem ser elencadas os elastômeros com carga e tecidos biológicos, onde se observam os comportamentos de viscoelasticidade e dano, e os materiais termoplásticos com a viscoplasticidade. Os mecanismos internos que regem a evolução da anisotropia diferem para cada material, mas de forma geral se observa que as estruturas internas destes materiais apresentam uma reorientação e/ou acúmulo de deformações permanentes orientados na direção dos carregamentos impostos. Na literatura diversos estudos experimentais apresentam evidências da anisotropia induzida pela deformação em diferentes materiais, contudo observa-se que não existe nenhum modelo consolidado para simulação numérica deste comportamento. Esta carência abre espaço para propostas com contribuição científica relevante em um tópico não muito explorado. Assim, o objetivo principal deste trabalho é desenvolver uma família de modelos constitutivos para materiais que apresentem comportamentos inelásticos anisotrópicos induzidos pela deformação. Para tanto, foi desenvolvida uma estrutura para determinação dos modelos constitutivos empregando um framework variacional, onde foi incorporado o conceito de função de distribuição de cadeias (CODF) para obter este comportamento. Com esta estrutura foram propostos modelos para materiais com acoplamento viscoelástico e dano anisotrópicos, bem como para materiais com viscoplasticidade anisotrópica induzida pela deformação. Por fim, são apresentados exemplos numéricos para compreensão das características desta família de modelos, e para demostrar a capacidade preditiva dos referidos fenômenos inelásticos anisotrópicos. Os resultados obtidos com os modelos desenvolvidos foram capazes de representar de forma qualitativa o comportamento de diferentes materiais poliméricos. Different materials such as synthetic and natural polymers present a tendency to accumulate oriented inelastic behaviors. As examples of materials that show anisotropic responses due to inelastic accumulation we can mention filled rubbers and soft biological tissues which show viscoelasticity and damage, and thermoplastic materials with viscoplasticity. Internal mechanisms governing the anisotropic evolution differ for each material, but in general the internal structures are observed to present a reorientation and/or accumulation of permanent deformations oriented in the direction of the imposed loads. Several experimental works in the literature present evidence of anisotropy induced by deformation in different materials, however there is no consolidated model for the numerical simulation of this behavior. Thus, the main objective of this work is to develop a family of constitutive models for materials that present anisotropic inelastic behavior induced by deformation. So, a structure was developed to determine the constitutive models using a variational framework, where the chain orientation distribution function (CODF) concept was incorporated to obtain this behavior. Models were proposed using this structure for materials with viscoelastic coupling and anisotropic damage, and materials with anisotropic viscoplasticity induced by deformation. Finally, numerical examples are presented to understand the characteristics of this family of models, and to demonstrate the predictive capability of the referred anisotropic inelastic phenomena. The results obtained with the developed models were able to qualitatively reproduce the behavior of different polymeric materials.
- Published
- 2020
42. PLASTICIDADE MUSCULAR: DO MÚSCULO SADIO AO ESPÁSTICO.
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Monte Alegre, Dalva Cruz, Santos Almeida, Josefa Flávia, Carvalho Oliveira, Tássia Virgínia de, and Farias Cândido, Edna Aragão
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SPASTICITY ,MUSCLE injuries ,ANATOMY ,BIOCHEMISTRY ,PATHOLOGICAL physiology - Abstract
Copyright of Scire Salutis is the property of CBPC - Companhia Brasileira de Producao Cientifica and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2012
- Full Text
- View/download PDF
43. Modelo matemático aplicado ao processo de extrusão de argilas.
- Author
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Andrade, F. A., Al-Qureshi, H. A., and Hotza, D.
- Subjects
MATHEMATICAL models ,EXTRUSION process ,PLASTIC extrusion ,MATERIAL plasticity ,ANALYSIS of clay - Abstract
The article presents a study which evaluates the application of a mathematical model to the process of clay extrusion. The study shows that compression tests of the clay were conducted to assess its plasticity. It mentions the potential correlation between effective stress of compression and extrusion pressure of the clay. It also emphasizes the importance of this effective stress which demonstrates the behavior of the clay during its forming process.
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- 2011
- Full Text
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44. Plasticidade e discurso visual na fotografia: temas de ação em Henri Cartier-Bresson e Pierre Verger.
- Author
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Santos, Ana Carolina Lima and Picado, Benjamim
- Subjects
- *
PHOTOGRAPHY , *PHOTOJOURNALISM , *PHOTOJOURNALISTS - Abstract
The present paper has the central aim of examining action themes in photography, exploring it as a sample of Henri Cartier-Bresson and Pierre Verger's works. In such an iconographic corpus, we seek the ways in which the original motionlessness of photographs might be invested in terms of a narrative construction, especially when we analyze the aspects of plastic investment of these visual clichés. From the standpoint of this inquiry, we imagine to derive the most important keys for the analysis of style in photographic expression. [ABSTRACT FROM AUTHOR]
- Published
- 2010
- Full Text
- View/download PDF
45. PERCORRER POR DENTRO, VISITAR: UMA LEITURA DE A MULHER E A CASA, DE JOÃO CABRAL DE MELO NETO.
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Toneto, Diana Junkes Martha
- Subjects
SEMIOTICS ,POETRY (Literary form) ,LANGUAGE & languages ,SIGNS & symbols ,MEANING (Psychology) - Abstract
Copyright of Alfa: Revista de Lingüística is the property of Alfa: Revista de Linguistica and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2009
46. (DE)MARCAS: matéria e plasticidade como cenografia
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Tudela, Mariana Sampaio E. Castro, Moreira, Hélder Jorge Maia da Silva, and Passos, Sónia Maria da Costa
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Plasticidade ,Set design ,Matter ,Plasticity ,Cenografia ,Movimento ,Performance ,Movement ,Body ,Matéria ,Corpo - Abstract
Submitted by Paulo Moreira (paulomoreira@esmae.ipp.pt) on 2020-01-23T18:11:57Z No. of bitstreams: 1 Mariana_Tudela_MAC_2019.pdf: 8162460 bytes, checksum: abc898a8cc0233df60c83b6ff2394a73 (MD5) Made available in DSpace on 2020-01-23T18:11:57Z (GMT). No. of bitstreams: 1 Mariana_Tudela_MAC_2019.pdf: 8162460 bytes, checksum: abc898a8cc0233df60c83b6ff2394a73 (MD5) Previous issue date: 2019-11-29 Restored into DSpace on 2021-10-06T13:14:04Z (GMT).
- Published
- 2019
47. Caracterização microestrutural e mecânica de ligas à base de níquel após processamento mecânico (deformação plástica severa) e tratamento térmico
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Renan Augusto Francisco Dias, Waldemar Alfredo Monteiro, Claudio Geraldo Schön, and Jan Vatavuk
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optical microscopy ,density ,microstructure ,heat treatments ,deformation ,grain boundaries ,nickel alloys ,mechanical properties ,materials working ,electron scanning ,x-ray diffraction ,plasticity ,stress analysis ,materials testing ,x-ray fluorescence analysis - Abstract
Uma variedade significativa de propriedades apresentadas pelos materiais é fortemente dependente da microestrutura, dentre elas pode-se citar limites de resistência e escoamento, alongamento, tenacidade, resistência ao impacto entre outras. Nas ligas comercializadas a microestrutura dos metais (tamanho de grão) é controlada de acordo com a aplicação, através de tratamentos termomecânicos convencionais, como forjamento, laminação e extrusão, onde o tamanho de grão alcançado pode chegar à ordem dos micrometros. O Equal-Channel Angular Pressing (ECAP), ou Prensagem Angular em Canais Iguais, é uma técnica de processamento não convencional, que tem a capacidade de submeter os metais processado à chamada deformação plástica severa (DPS), permitindo assim a obtenção de metais com tamanhos de grão abaixo de 1μm. O presente trabalho irá analisar os fenômenos metalúrgicos envolvidos na aplicação do ECAP na superliga de níquel Inconel 600 (liga 600), composta de 72% níquel, 14-17% cromo e 6-10% ferro, que é utilizada na indústria nuclear como material dos tubos do circuito primário dos geradores de vapor dos Pressurized Water Reactors (PWR), ou Reatores de Água Pressurizada. Amostras da liga 600 foram solubilizadas e processadas por ECAP até 5 passes utilizando as rotas A e Bc e, após o processamento, algumas foram submetidas à tratamentos térmicos em diferentes temperaturas. Para caracterização microestrutural foram utilizados microscópios óptico, eletrônico de varredura e de transmissão, a textura foi analisada por meio das técnicas de difração de raios X e Electron Backscatter Diffraction, EBSD ou Difração de Elétrons Retro-Espalhados e a dureza foi caracterizada por meio de microdureza Vickers. Após a deformação da liga 600 solubilizada, observou-se uma mudança na microestrutura, a amostra solubilizada possuía grãos grosseiros e apresentava maclas de recozimento e, após o primeiro passe notou-se formação de estruturas de deformação com o aparecimento de linhas de escorregamento e após o terceiro passe são observadas bandas de deformação e de transição. Também foram observadas diferentes subestruturas de discordâncias formadas pelas diferentes rotas de processamento como estruturas celulares e microbandas. A microdureza da liga sofreu um incremento à medida que novos passes foram feitos, fenômeno que pode ser correlacionado com o aumento da resistência mecânica da liga. Além disso, observou-se que pela rota BC os valores de microdureza são mais homogêneos do que os encontrados pela rota A. As análises de EBSD evidenciaram que rota BC produziu grão mais equiaxiais e também uma quantidade maior de grãos com contornos de alto ângulo, enquanto a rota A produziu grãos mais alongados e uma menor quantidade de grãos com contornos de alto ângulo. A análise, por difração de raios X, das amostras deformadas pela rota A, sem tratamento térmico, evidenciou que uma tendência de formação de textura associada aos planos e direções {111} , e após os tratamentos térmicos houve a formação uma nova textura associada aos planos e direções {114} . As amostras deformadas pela rota BC tende a formar texturas referentes aos planos e direções {112} apesar da formação de outras texturas, que após os tratamentos térmicos formaram diversas outras texturas associadas aos planos e direções {110} , {100} e {111} . A significant variety of properties presented by the materials is strongly dependent on the microstructure, among them one can mention limits of resistance and flow, elongation, tenacity, resistance to impact among others. In commercial alloys, the microstructure of the metals (grain size) is controlled according to the application, through conventional thermomechanical treatments such as forging, rolling and extrusion, where the grain size reached can reach the order of micrometers. The Equal-Channel Angular Pressing (ECAP) is an unconventional processing technique, which has the ability to subject the processed metals to the so-called severe plastic deformation (DPS), thus allowing the production of metals with grain sizes below 1μm. The present work will analyze the metallurgical phenomena involved in the application of ECAP in the Inconel 600 nickel superalloy (alloy 600), composed of 72% nickel, 14 ± 17% chromium and 6-10% iron, which is used in the nuclear industry as material of the Pressurized Water Reactors (PWR) steam generator primary circuit tubes, or Pressurized Water Reactors. Samples of alloy 600 were solubilized and processed by ECAP up to 5 passes using routes A and Bc and, after processing, some were subjected to thermal treatments at different temperatures. Optical, scanning electron and scanning electron microscopes were used for microstructural characterization. The texture was analyzed by means of X-ray diffraction and Electron Backscatter Diffraction, EBSD or Diffraction of Retro-scattered Electrons and the hardness was characterized by means of Vickers microhardness . After deformation of the solubilized alloy 600, a change in the microstructure was observed, the solubilized sample had coarse grains and had annealing maclas and, after the first pass, it was noticed the formation of deformation structures with the appearance of sliding lines and after The third pass shows deformation and transition bands. Different substructures of dislocations formed by different processing routes, such as cell structures and microbands, were also observed. The microhardness of the alloy has increased as new passes have been made, a phenomenon that can be correlated with the increased mechanical strength of the alloy. In addition, it was observed that by route BC the values of microhardness are more homogeneous than those found by route A. EBSD analyzes showed that BC route produced more equiaxial grains and also a larger amount of high angle grain boundaries, while route A produced longer grains and a smaller amount of high angle grain boundaries. X-ray diffraction analysis of the deformed samples by route A, without heat treatment, showed a tendency of texture formation associated with the planes and directions {111} , and after the heat treatments there was a new texture associated with planes and directions {114} . The samples deformed by the BC route tend to form textures referring to planes and directions {112} despite the formation of other textures, which after heat treatments formed several other textures associated with planes and directions {110} , {100} and {111} .
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- 2019
48. Two-dimensional rate-independent plasticity using the element-based finite volume method
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Francisco Marcondes and Paulo Vicente de Cassia Lima Pimenta
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0209 industrial biotechnology ,Finite volume method ,Structural mechanics ,business.industry ,Mechanical Engineering ,Applied Mathematics ,Isotropy ,General Engineering ,Aerospace Engineering ,02 engineering and technology ,Plasticity ,Computational fluid dynamics ,Industrial and Manufacturing Engineering ,020901 industrial engineering & automation ,Electromagnetism ,Nonlinear material ,Automotive Engineering ,Applied mathematics ,Mechanics expansion ,Element (category theory) ,Thermal expansion ,business ,Plane stress ,EbFVM - Abstract
The element-based finite volume method (EbFVM) is well established in computational fluid dynamics; in the last decade, it has been extended to several areas of engineering and physics interest, such as electromagnetism, acoustics, and structural mechanics analysis with complex geometrical shapes. This paper describes the treatment of the conservative EbFVM approach for two-dimensional isotropic elastic–plastic rate-independent problems. In particular, we use plane strain and plane stress approaches upon incremental thermal and mechanical loads. In order to verify the performance of the EbFVM, numerical results are compared with a commercial simulator. Finally, from the present implementation and the comparisons performed, we can ensure that EbFVM makes accurate prediction as the traditional numerical approach commonly employed for the solution of mechanics problems.
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- 2019
49. Nervous regeneration after medullary ventral roots crushing at the CNS and PNS interface and treatment with dimetyl-fumarate (DMF)
- Author
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Menezes-de-Carvalho, Nahanna Zimmermann, 1990, Oliveira, Alexandre Leite Rodrigues de, 1971, Bernardes, Danielle, Mietto, Bruno de Siqueira, Universidade Estadual de Campinas. Instituto de Biologia, Programa de Pós-Graduação em Biologia Celular e Estrutural, and UNIVERSIDADE ESTADUAL DE CAMPINAS
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Plasticidade ,Degeneração neural ,Immunomodulation ,Plasticity ,Imunomodulação ,Neuroproteção ,Neurônios motores ,Nerve degeneration ,Neuroprotection ,Motor neurons - Abstract
Orientador: Alexandre Leite Rodrigues de Oliveira Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Biologia Resumo: Lesões no SNC normalmente deixam sequelas de difícil transposição, sendo um importante problema na área médica. A fim de investigar a neuroproteção/degeneração e a plasticidade sináptica de motoneurônios, além do potencial de uma variedade de tratamentos, diferentes modelos experimentais de lesão axonal têm sido propostos. Recentes estudos realizados com uso da droga imunomoduladora dimetil-fumarato (DMF), para tratamento de doenças neurodegenerativas apresentaram efeitos promissores. Portanto, nesse trabalho investigamos os efeitos do DMF no que tange a neuroproteção e sua influência sobre a resposta glial, em animais C57BL/6, submetidos ao esmagamento de raízes motoras, na intumescência lombar da medula espinal. Os animais foram divididos em grupo lesão tratado com veículo (grupo controle, n=7) e grupos lesão associado ao tratamento com DMF, em diferentes doses (15, 30, 45, 90 e 180mg/Kg; n=7 por dose, sendo o DMF diluído em solução 0,08% de metilcelulose). Avaliou-se sobrevivência neuronal, através da coloração de Nissl, recuperação funcional, pelo sistema CatWalk e mecanocepção pelo teste de von-Frey, sendo a sobrevida de 4 semanas pós-lesão. A dose que apresentou melhores resultados diante destes testes (90mg/kg) foi utilizada para o tratamento num período de oito semanas, sendo este grupo posteriormente submetido às mesmas análises. Imunoistoquímica foi empregada para avaliar a cobertura sináptica, reatividade astroglial e reatividade microglial, utilizando os anticorpos primários anti-sinaptofisina (terminais pré-sinápticos), GAD65 (terminações pré-sinápticas GABAérgicas - inibitórias), VGLUT1 (terminações pré-sinápticas glutamatérgicas - excitatórias), IBA1 (marcador para micróglia) e GFAP (marcador para astrócitos). Análises moleculares, em relação à expressão gênica, por qRT-PCR, levaram em conta a produção de citocinas pró e anti-inflamatórias, utilizando primers para amplificação de IL-3, IL-4, TNF-a, IL-6, TGF-ß, iNOS-M1 e arginase-M2. Os resultados indicaram que o tratamento com DMF, na dose de 90mg/kg, promoveu neuroproteção e imunomodulação. Ainda, resultou em maior preservação dos inputs sinápticos e contribuiu para a regeneração axonal, pois reduziu a reatividade astroglial, propiciando um ambiente mais favorável à recuperação motora e sensitiva Abstract: CNS lesions usually result in permanent loss of function, being an important problem in the medical field. In order to investigate neuroprotection/degeneration and synaptic plasticity of motor neurons, in addition to the potential for a variety of treatments, different experimental models of axonal injury have been proposed. Recent studies with the use of the immunomodulatory drug dimethyl-fumarate (DMF), for the treatment of neurodegenerative diseases have shown promising outcomes. Therefore, in this work we investigated the effects of DMF with regard to neuroprotection and its influence on the glial response, in C57BL/6 animals, submitted to the crushing of motor roots, in the lumbar intumescence of the spinal cord. The animals were divided into a vehicle-treated injury group (control group, n = 7) and injury groups associated with DMF treatment, at different doses (15, 30, 45, 90 and 180mg/kg; n = 7 per dose, with DMF diluted in 0.08% methyl cellulose solution). Neuronal survival was assessed through Nissl staining, functional recovery using the CatWalk system and mechanoreception using the von-Frey test, with a 4-week survival after injury. The dose that showed the best results in the face of these tests (90mg/kg) was used for the treatment over a period of eight weeks, and this group was subsequently subjected to the same above mentioned analyzes. Immunohistochemistry was used to assess synaptic coverage, astroglial reactivity and microglial reactivity, using the primary antibodies anti-synaptophysin (presynaptic terminals), GAD65 (GABAergic presynaptic terminations - inhibitory), VGLUT1 (glutamatic presynaptic terminations - excitatory). Glial reaction was accessed with anti-IBA1 (marker for microglia) and GFAP (marker for astrocytes). Molecular analyzes, in relation to gene expression, by qRT-PCR, took into account the production of pro- and antiinflammatory cytokines, using primers for amplification of IL-3, IL-4, TNF-a, IL-6, TGF- ß, iNOS-M1 and arginase-M2. The results indicated that treatment with DMF, at a dose of 90mg/kg, promoted neuroprotection and immunomodulation. It also resulted in greater preservation of synaptic inputs and contributed to axonal regeneration, as it reduced astroglial reactivity, providing a more favorable environment for motor and sensory recovery Mestrado Biologia Celular Mestra em Biologia Celular e Estrutural CNPQ 169690/2017-2
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- 2019
50. Produtividade e características agronômicas da soja em função de falhas na semeadura
- Author
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Fiss, Guilherme, Schuch, Luis Osmar Braga, Peske, Silmar Teichert, Castellanos, César Iván Suárez, Meneghello, Geri Eduardo, and Aumonde, Tiago Zanatta
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Plasticidade ,Componentes de rendimento ,Yield ,Plasticity ,Yield components ,Rendimento ,Agronomia ,Glycine max (L.) Merril - Abstract
The unevenness in the distribution of plants along the sowing line implies an inefficient use of available resources, such as light, water and nutrients, causing losses in productivity resulting from intraspecific competition within the plant population. This study aims to determine the plasticity effect of soybean plants of a population as a result of sowing failure and its relation with productivity. In two commercial soybean production fields, seeded with Fundacep cultivars 59 RR and BMX Potência RR, different plant distributions were identified along the row planting, observing the presence of individual, double, triple plants and plant failures of various sizes in one meter of sowing. Agronomic characteristics and the yield per specimen and per area of their different plant distributions were evaluated. With failures in the sowing line, the increasing production of plants located in the failure edges does not compensate the production loss caused by the lack of plants. Proper distribution of plants along the sowing line provides greater productivity in soybean culture. The occurrence of double or triple plants in a population declines productivity. A desuniformidade na distribuição de plantas ao longo da linha de semeadura implica um aproveitamento ineficiente dos recursos disponíveis, como luz, água e nutrientes, provocando perdas na produtividade decorrentes da competição intraespecífica na população de plantas. O objetivo deste trabalho foi determinar o efeito da plasticidade de plantas de soja de uma população em função de falhas na semeadura e sua relação com a produtividade. Em dois campos de produção comercial de soja, semeados com as cultivares Fundacep 59 RR e BMX Potência RR, foram identificadas diferentes distribuições de espécimes ao longo da linha de semeadura, observando-se a presença de plantas individuais, duplas, triplas e falhas de vários tamanhos dentro de um metro linear de semeadura. As características agronômicas e as produtividades por espécime e por área de suas diferentes distribuições foram avaliadas. Com a ocorrência de falhas na linha de semeadura, o aumento da produção das plantas localizadas nas bordas de falhas não compensa a perda de produção causada pela lacuna nas linhas. Sua adequada distribuição ao longo da linha de semeadura proporciona maior produtividade na cultura da soja. A ocorrência de plantas duplas ou triplas em uma população diminui a produtividade.
- Published
- 2018
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