Browsing by Issue Date, starting with "2017-03-14"

Filter results by year or month

Now showing 1 - 20 of 14225

Modificação da molhabilidade da celulose por processos subsequentes de ablação e deposição a plasma
(Universidade Federal de São Carlos, 2017-03-14)
Camargo, Janine Sanches Gonzaga de
;
Menezes, Aparecido Junior de
;
https://lattes.cnpq.br/0484426340349483
;
Silva, Adriana de Oliveira Delgado
;
https://lattes.cnpq.br/2707979913713089
Cellulose is a biopolymer available in abundance in nature, which presents very interesting properties mainly for the textile, packaging and paper industry. However, due to its strongly hydrophilic character, resulting from the presence of a large number of free hydroxyl groups in its molecule, its use in certain areas becomes limited. In order to promote the modification of the wetting characteristic of the cellulose, and make it superhydrophobic, samples of this material were submitted to plasma processes performed in two steps: ablation and film deposition. Initially, the effect of variation of ablation time on the creation of adequate surface topography was studied. For this, the samples were exposed to the oxygen plasma at a pressure of 13 Pa and power of 150 W, varying the treatment time from 5 to 60 minutes. Then, the treated samples were submitted to the process called PECVD (Plasma Enhanced Chemical Vapor Deposition), in which a film was deposited on the surface from the precursor hexamethyldisiloxane (HMDSO) in the presence of argon, in a ratio of 70 e 30%, respectively. The deposition time was set to 30 minutes and the power applied was 150 W. In a second investigation, the effect of the thickness of the deposited film was studied. In this case, the cellulose samples were previously exposed to the oxygen ablation plasma for 60 minutes and then led to the PECVD process, with the deposition time varying from 5 to 30 minutes. In a third investigation, the duration of the ablation and deposition steps was reduced to 30 and 1 minute, respectively, in order to optimize the methodology. The samples were characterized by Scanning Electron Microscopy (SEM), Energy Dispersive Spectroscopy (EDS), Fourier Transform Infrared Spectroscopy (FTIR), profilometry, static contact angle measurements and hysteresis and sliding angle measurements. The results demonstrated that longer exposure times for the ablation step provide a significant modification in the material, through the creation of nanoscale structures on the surface of the fibers. The deposition step promoted the formation of films with organosilicon character on the cellulose surface, with thicknesses varying between 144 and 910 nm. The combination of the topography created after 30 minutes of ablation with the thin film resulting from the deposition step for 1 minute provided a surface with low receptivity for both polar (? = 150°) and nonpolar (? ~ 120°) liquids, whose wettability property remained stable with treatment aging time. The low values obtained for hysteresis (9°) and sliding angle (7°) confirm the creation of a superhydrophobic roll-off surface.
Diálogos entre moda e cultura : um olhar bakhtiniano para as narrativas do estilista Ronaldo Fraga
(Universidade Federal de São Carlos, 2017-03-14)
Dias, Nicole Cristine de Aquino
;
Miotello, Valdemir
;
https://lattes.cnpq.br/9131819326282708
;
https://lattes.cnpq.br/9289507701075286
This research project seeks to provide a dialogic analysis of Ronaldo Fraga’s utterances, with special attention to the ones produced during two of his collections, O Turista Aprendiz, summer 2010/2011, and Turista Aprendiz na Terra do Grão Pará, summer 2012/2013. By doing this, the objective is to demonstrate how his words are permeated and constituted by other people’s words, for example the ones by Mario de Andrade.Consequently, Ronaldo Fraga’s utterances are biased and reflect the writer’s discourse, as the modernist and his ethnographic journey, presented in the book O Turista Aprendiz, are constant inspirations to the project of the designer, who has the Brazilian culture as the main point of his fashion production. By having the Bakhtinian theoretical and methodological premises as the framework of the project, we want to perceive how this otherness constitutes the designer’s ethical-aesthetic act and how his responsible act provides the change of considering fashion as also inserted in the cultural discussions, beyond the folkloric outfits. In order to achieve our objectives, we will compare texts, taking into account two specific fashion shows by Ronaldo Fraga in comparison to Mario de Andrade’s book O Turista Aprendiz. We will use in our analyses the concepts of dialogism, ideology, otherness and carnivalization. From this interaction, we will look for the meaning of culture.We also use as a basis the book Caderno de roupas, memórias e croquis, published by the designer. In this book, he gathered some elements of his creative process from some of his collections and parts of interviews and lectures. We intend to offer to this research area a dialogic reflection on the relationships between fashion and culture, amplifying the comprehension and the engagement of the linguistic studies from this perspective.
Síntese de membranas de alumina anódica porosa sobre substratos metálicos obtidos por evaporação térmica
(Universidade Federal de São Carlos, 2017-03-14)
Garcia, Uanderson Mezavila
;
Trivinho-Strixino, Francisco
;
https://lattes.cnpq.br/9740223649776400
;
https://lattes.cnpq.br/6240710477686567
This work covers the investigation and synthesis of nanometric structures of Porous Anodic Alumina PAA, produced from low purity substrates, in aim to obtain selfsustained membranes. The Hard Anodization (HA) and Mild Anodization (MA) processes were used under special conditions through those found in literature. The analyses of results were based in comparing the AAP produced under the same conditions except the applied potential that was different depending on the MA or HA. HA process had its time halved in order to investigate the oxide growth rate and to calibrate the conditions of anodized membrane synthesis over the glass samples. This work also covers the construction of a resistive thermal evaporation PVD system capable of evaporating metals with melting points below 800°C. Through the deposition of successive layers it was possible to obtain metallic films of aluminum with thicknesses above 10 µm, enabling conditions of synthesis of porous anodic alumina on substrates produced by thermal resistive evaporation. The result of membrane synthesis on low purity aluminum substrates was complement to the synthesis of membranes obtained in aluminum evaporated in glass substrates, since the thickness of each deposited film is low if compared to the thickness of the AAP layer. Therefore, it was necessary to make several Al depositions on the same samples, to obtain an aluminum film that was able to support an oxide layer of anodic alumina and with the same characteristics of those obtained by the process of MA. All anodized samples were characterized by scanning electron microscopy, including samples made from metalized aluminum. The micrography obtained from the low purity aluminum membranes were treated by ImageJ software allowing the morphological analysis. AAP membranes obtained from technical Al substrate depicted the formation of branched pore channels, a result of instabilities in applied electric field during Anodization and presence of different alloying elements in the Al substrate. The metalized aluminum film had a larger thickness in the samples positioned in the middle of the sample holder possibly due to different temperature gradients of filament depending on the position of Al pellets.
Catalisadores com estrutura do tipo perovskitas PrCo1-xNixO3 para produção de gás de síntese
(Universidade Federal de São Carlos, 2017-03-14)
Dias, Eduarda Cristina Caixeta
;
Assaf, José Mansur
;
https://lattes.cnpq.br/9563312407691130
;
https://lattes.cnpq.br/3291804329900857
Energy is an essential component for a country's development. Since Brazilians’ main energy source is the oil and it has limited reserves, an alternative is needed for a synthesis of fuels throughout other raw materials, such as natural gas, which is abundant in nature and rich in methane. Methane gas is the main precursor for synthesis gas formation, a mixture of CO and H2 that can generates various synthetic compounds such as gasoline, methanol, hydrocarbons and others. This gas mixed with carbon dioxide, which are the two main greenhouse gases, reacts in the presence of a catalyst forming the synthesis gas through the dry reforming. In this context, several studies are being carried out to find a high catalyst conversion, high selectivity for CO and H2, low cost, and mainly resistance to the carbon deposition; which is the main cause of deactivation in this type of catalyst. A family of elements that may contain containing responses to such problems is perovskite oxides showing as a general formula ABO3, which in latter A are the rare earths, alkaline earths or alkaline; and B are the transition metals. In this project they were synthesized with the type of perovskite PrCoO3 with the insertion of the nickel in the structure forming oxides of formula PrCo1-xNixO3. The samples of catalysts were characterized by X-ray diffraction, specific surface area (BET), temperature programed reduction (TPR), X-ray fluorescence (FRX), thermogravimetric analysis (ATG) and thermo differential analysis (DTA). Its catalytic activity was tested in the range of 500 to 800 °C, verifying the results of progressive conversion as the nickel content in the structure increases. The results showed conversions up to 72%, yielding 84,7% for CO and 38, 8% for hydrogen, therefore a ratio of H2 / CO ≈ 1:2. Stability analyzes indicated that the catalysts remained stable, without loss of activity in the time of 8 h. Also it was observed that cobalt assists in the inhibition of carbon formation, minimizing the deactivation.
O Banco Mundial, o neoliberalismo e a educação do campo no Brasil
(Universidade Federal de São Carlos, 2017-03-15)
Moretti, Monica Fernanda Botiglieri
;
Bezerra Neto, Luiz
;
https://lattes.cnpq.br/4809080593333472
;
https://lattes.cnpq.br/5704541299775162
This study analyzes the participation of the World Bank in rural education projects in Brazil based on two hypotheses. Firstly, what means to a neoliberal political project justify poverty reduction and improve the living conditions of the individuals, and, secondly, in the Brazilian governments called "right" or "left", although they assume distinct political discourses, they have a lot of assumptions in common. In this way, fundamental concepts are understood and their results are fundamental for the debate that they propose to an understanding of the education elaborated for rural individuals. To do so, we use authors who discuss this theme, as well as the survey conducted with the World Bank, forming a base of research on financial projects for those who are interested in getting to know them. At the end of analytical forms we could perceive the neoliberal bias embedded in the speeches elaborated by the World Bank, as well as a trajectory of its action in the education of the Brazilian countryside. To the researchers of the area of fundamental importance for the comprehensiveness of the institution, its capillarity and influences, in this way, this study opened space for other researches in its continuity.
Estudo das propriedades físicas do composto NixPb1-xTiO3: compósito versus solução sólida
(Universidade Federal de São Carlos, 2017-03-15)
Costa, Renilton Correia da
;
Pizani, Paulo Sérgio
;
https://lattes.cnpq.br/1038437165007849
;
https://lattes.cnpq.br/5638654222377956
In this work a physical properties study of the samples series NixPb1-xTiO3 will be presented using several experimental techniques, with emphasis on Raman spectroscopy and X-ray diffraction. For these samples, Raman scattering is a powerful characterization technique once the E (1TO), smallest wavenumber of PbTiO3, so-called "soft mode", is a very sensitive probe for small lowest structural local symmetry changes. The samples with x = 0.0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9 and 1.0 were synthesized by the solid state reaction method using oxides, PbO, NiO and TiO2, with 99% purity degree. The precursor oxides were milled in a high energy vibratory mill and thermal treated at temperatures ranging from 925 K to 1375 K. The atomic substitution for ions with a very different crystal radius is one of the convenient routes for the generation of composites on ATiO3-type materials. Another possible route is to use materials which the end compositions have different crystallographic structures. As materials in the form of a solid solution or composite may present different properties, their study becomes a relevant theme. Lead titanate, PbTiO3, is an important ferroelectric material which has tetragonal structure at room conditions and whose several physical properties such as structural, vibrational, thermal, dielectric, etc. are well known in the literature. On the other hand, nickel titanate, NiTiO3, has rhombohedral ilmenite structure at room conditions and is employed manly as a dry lubricant due to its high hardness or as a pigment. Moreover, it presents magnetic ordering, being hence a possible candidate to be used in new materials with magneto-electric properties. PbTiO3 and NiTiO3 are both ATiO3-type materials, so it can be expected that their combination may results in very interesting material for technological applications such as the reduction of the high loss and dielectric constant of PbTiO3, a request for devices working in the microwave frequencies.
Diálogos entre dois contos machadianos : leituras de “O segredo de Augusta” e “Uma senhora”
(Universidade Federal de São Carlos, 2017-03-15)
Camargo, Eduarda Rita Nicoletti
;
Marques, Wilton José
;
https://lattes.cnpq.br/5763590592946918
;
https://lattes.cnpq.br/5721204970762741
This work aims to study two short stories by the writer Machado de Assis, taking in consideration their thematic approximation, leading one to believe that the second short story, "Uma senhora", from 1883, would be the rewrite of a previous short story, "O segredo de Augusta”, from 1868. In order to achieve this, the analysis take into consideration the leitmotiv of the vain woman and the figure of the narrator and in what way the narrator articulates the characters throughout the narrative. Thus, the author uses the theme of a previous short story, still marked by romantic characteristics and rewrite it, guaranteeing a formal improvement in the process of rewriting.
O Geogebra no ensino de Física: propostas de aplicação para o ensino do movimento Harmônico simples
(Universidade Federal de São Carlos, 2017-03-15)
Carmo, Rodrigo
;
Soares, Antonio Augusto
;
https://lattes.cnpq.br/8093480629202515
;
https://lattes.cnpq.br/2291914455874755
In this work we discuss two important movements that are part of the curriculum of the physical discipline of physics in high school, wich are classified as part of a set of phenomena that constitute as an Simple Harmonic Motion (SHM). Namely, the pendulum movement and the projection of uniform circular motion on one of the cartesian axes. In both situations we have a SHM. We have developed dynamic simulations of these phenomena using GeoGebra software. This approach allows user’s, teacher and student, the establish a visual connection between geometry, algebra and the physical concepts present in the studied subjects, it allows interactions that go beyond the conventional simulators, such as having full access to the programming used, allowing user’s to control it at will. We also elaborated two routes of usage, one for each simulator. We applied the simulators in the environment a suggestion of didactic application of our simulators.
O curso de mestrado profissional em matemática em rede nacional à luz da teoria de Bourdieu: tensões entre matemática acadêmica e matemática escolar
(Universidade Federal de São Carlos, 2017-03-15)
Farias, José Vilani de
;
Vilela, Denise Silva
;
https://lattes.cnpq.br/3915260629619142
;
https://lattes.cnpq.br/8155152145332951
;
https://orcid.org/0000-0002-3411-3420
O objeto de análise deste artigo é o curso de Mestrado Profissional em Matemática em Rede Nacional, PROFMAT, especificamente quanto à sua matriz curricular nas três diferentes versões que se sucederam à sua implantação, em 2010, até o ano de 2012. Este estudo justifica-se pela dimensão e abrangência do referido curso. Os documentos de pesquisa, constituídos pelas versões da matriz curricular, serão analisados à luz da teoria sociológica de Bourdieu, da qual se destacam para esta análise os conceitos de habitus, capital e campo. Buscar-se-á delinear o campo da matemática no âmbito desse Programa a fim de entender o que Bourdieu chama de estratégias de reprodução das relações hierárquicas – nesse caso, entre a prática matemática dos matemáticos e a prática matemática dos professores no âmbito da escola –, assim como as estratégias de conservação e legitimação de um modo de fazer matemática. Nesse sentido, serão enfatizados aspectos que aproximam ou afastam o Programa do que preconizam as recentes pesquisas a respeito da formação docente.
Monitoramento metacognitivo em adultos analfabetos funcionais e absolutos
(Universidade Federal de São Carlos, 2017-03-15)
Fujie, Márcia Akemi
;
Schelini, Patrícia Waltz
;
https://lattes.cnpq.br/6185333517392859
;
https://lattes.cnpq.br/3161677431639997
Self-regulation refers to thoughts, feelings and actions that are planned and cyclically adapted so as to make the individual reach their goals. Within the self-regulation is the metacognitive monitoring, the ability with which the individual follows and evaluates their own cognition. The present study was divided into two studies, both aimed to investigate the metacognitive monitoring of illiterate adults using the metacognitive judgement, a measure of the metacognitive monitoring, in cognitive tasks that evaluate the general factor of intelligence, processing speed and short-term memory. The relation between the real performance and the estimated performance was also investigated, including in which cognitive task the real performance related more to the estimated performance. In addition, we investigated which type of judgment model – the only difference between the two studies – was the most accurate. The participants of Study (1) included 34 functional or fully illiterate adults, from both genders, and age between 40 and 60 years old; and participants of Study (2) included 15 functional or fully illiterate adults, from both genders, and age between 20 and 74 years old. The instruments utilized were: Initial Interview, R-1 Test and subtests Digit Symbol-Coding, Symbol Search and Digit Span from the Wechsler Adult Intelligence Scale III (WAIS III), Judgment Register from 0 to 10, Judgement Register from 0 to 100 and Judgement Register with the use of a metric object. Results indicated that the real performance of the subjects, in both studies, were lower when compared to subjects with a greater level of education, and, according to the Pearson product-moment correlation coefficient, there was a significant correlation between the real performance and the estimated performance in the subtest Digit Symbol-Coding in Study 1, and significant correlation between real and estimated performance in the subtests Digit Symbol-Coding, Digit Span and Symbol Search in Study 2. In addition, results indicated that the judgment made with a metric object presented he most accurate measures.
O processo de constituição do livro Dois Irmãos : uma análise da paratopia criadora de Milton Hatoum
(Universidade Federal de São Carlos, 2017-03-15)
Pereira, Claudia Maria de Serrão
;
Salgado, Luciana Salazar
;
https://lattes.cnpq.br/5206927424265495
;
https://lattes.cnpq.br/7136555331134427
A partir del enfoque derivado del Análisis del Discurso de línea francesa y del cuadro teórico-metodológico propuesto por Dominique Maingueneau en sus trabajos sobre la investigación del discurso literario, esta disertación analiza el proceso de constitución del libro Dos Hermanos, del autor Milton Hatoum, con el propósito de describir e interpretar los modos por los cuales la gestión de la figura del autor se inscribe en los procesos de circulación, distribución y recepción del producto literario. De acuerdo con nuestro andamiaje teórico, podemos afirmar que configurándose como un discurso constituyente, el literario preside a través de un régimen de funcionamiento que moviliza redes discursivas específicas que determinan valores atribuidos a las diferentes obras. Consecuentemente, podemos entender tales procesos discursivos a partir del concepto de paratopia creadora, que señala a la comprensión por la cual el valor de un libro no emerge de una contingencia, sino ante la comunidad en que circula. La selección del libro Dos Hermanos no se ha dado únicamente porque la obra es considerada una de las más significativas de la producción literaria brasileña contemporánea, también por una serie de indicios que la convierten en un objeto provechoso para la investigación: i. se trata del libro más vendido de Milton Hatoum, autor cuya identidad autoral se señala como representativa en los llamados estudios regionalistas; ii. la obra ha sido adaptada al medio audiovisual a través de la creación de una “miniserie”, cuyo estreno se ha producido durante la ejecución de este trabajo; iii. hay un número considerable de críticas y reseñas con respecto de su producción así como entrevistas con el propio autor; iv. el autor es reconocido por narrar de modo incisivo el acontecer de la ciudad de Manaus, un factor constantemente retomado en la constitución de los imaginarios acerca de su trabajo. Con esos indicios, avanzamos un análisis de los modos por los cuales el autor opera las regularidades y los valores conjugados tanto a las textualidades de su obra cuanto a la propia figura de autor.
Mediação editorial na comunicação científica : um estudo de dois periódicos de humanidades
(Universidade Federal de São Carlos, 2017-03-15)
Clares, Letícia Moreira
;
Salgado, Luciana Salazar
;
https://lattes.cnpq.br/5206927424265495
;
https://lattes.cnpq.br/5937201924820709
En este trabajo, proponemos un estudio de la mediación editorial en la comunicación científica, buscando investigar cómo funcionan los procesos de tratamiento editorial de textos en dos publicaciones científicas del área de humanidades (una categoría puesta en cuestión) y cuáles son sus efectos en la comunicación del conocimiento científico. Son consideradas como objetos de análisis las revistas del Instituto de Estudios Brasileños – IEB-USP, Rieb, y del Programa de Postgrado en Geografía de la FFLCH-USP, Geousp: espaço e tempo, además de un conjunto de materiales que circularon bajo la rúbrica edición científica en cursos, eventos y ofertas de servicios editoriales en ambientes especializados, buscando comprender de qué manera los ritos genéticos editoriales dan indicios de la constitución de la comunicación científica como una institución discursiva y, de este modo, en qué medida las condiciones de producción de las publicaciones producen, entre otras cosas, la extinción del hecho de que hay distintas comunidades discursivas. Basado en el método descriptivo-interpretativo característico del análisis del discurso de línea francesa y a la luz de las propuestas teórico-metodológicas de Dominique Maingueneau, movilizamos la noción de escenas de enunciación, objetivando describir un panorama de los elementos coyunturales del universo discursivo editorial de la comunicación científica e investigar cómo, en ese contexto, funcionan las publicaciones. Así que observamos cómo los ritos genéticos editoriales se operan en estos materiales y se relacionan a la constitución del escenario actual de la comunicación científica, dadas las formas como las distintas prácticas de textualización de los atores involucrados en los procesos editoriales evidencian consensos y resistencias en los procesos de producción, circulación y consumo de conocimiento.
Adaptação para pré-escolares de subtestes da bateria multidimensional de inteligência infantil
(Universidade Federal de São Carlos, 2017-03-15)
Manfrin, Estela
;
Schelini, Patrícia Waltz
;
https://lattes.cnpq.br/6185333517392859
;
https://lattes.cnpq.br/0224996068682310
The adaptation or elaboration of tests that can validly and accurately evaluate the intellectual abilities of Brazilian preschool children is relevant, considering, among other factors, the lack of instruments. The Cattell-Horn-Carroll Model (CHC) is regarded as the one that most tends to give rise to techniques of intellectual evaluation and consists of a multidimensional vision that conceives the intelligence through capacities or general factors. The Multidimensional Battery of Children Intelligence (BMI), based on such a model, is intended for the evaluation of children between 7 and 12 years. The general objective of the present study was to adapt for preschoolers and to analyze the evidence of validity and accuracy of the sub-tests General Vocabulary, Memory for Names, Speed of Perception and Response Speed of BMI. The first stage of the study consisted of the adaptation of the General Vocabulary, to be used in children between 4 years and 6 years and 11 months. Participants included 10 mothers and 10 female teachers who answered a questionnaire and the original BMI items. 227 different words of children's knowledge were raised and 86 which they were not yet able to understand, according to parents and teachers. Through the relative frequency of the words, the selection was made to compose the new items of the subtest. Thus, from the study with parents and teachers, the 1st version of the General Vocabulary subtest for preschoolers was prepared, consisting of the 35 original BMI and 18 new items. The second step consisted in sending the four subtests to five expert judges to investigate the evidences of content validity through the analysis of agreement between them. The first version of the General Vocabulary sub-test for preschoolers was sent to the judges, as well as three other original BMI subtests: Memory for Names, Speed of Perception, and Speed of Response. After the judges' analysis, the General Vocabulary subtest had 6 excluded items and 5 reformulated items. The Memory for Names only had change in one item and the other subtests did not change in their items, only in the instructions. The third step consisted of a pilot study with 10 children, so that changes in instructions and two subtests were found. Eight items of the General Vocabulary were excluded, giving rise to the 3rd version of the General Vocabulary with a total of 38 items; In Velocity of Perception the numbers were replaced by figures, giving rise to the 1st version of this subtest for preschoolers. Finally, the fourth step was the application in a sample of 43 preschoolers for the analysis of validity evidences based on relations with external variables and precision. All subtests had statistically significant results in relation to the "age" variable. As for accuracy, the 3rd version of the General Vocabulary had alpha of 0.81 and the 1st version in the Memory for Names of 0.42. In the Rapid Response and in the 1st version of the Processing Speed it was not possible to calculate the accuracy. In this way, we conclude that the adaptation to preschoolers of BMI subtests presented evidence of validity based on the variable "age" and the 3rd version of the General Vocabulary was accurate. It is necessary to carry out studies with a larger sample, in order to continue the validity and precision surveys
Leitura dos primeiros contos de Machado de Assis no Jornal das Famílias
(Universidade Federal de São Carlos, 2017-03-15)
Hora, Carla Laureto
;
Marques, Wilton José
;
https://lattes.cnpq.br/5763590592946918
;
https://lattes.cnpq.br/2634446551160117
The tradition of critical studies of Machado de Assis’ work put aside his f breaking his trajetory in two phases and valuing positively only the one called “maturity phase”. The objects of this study are the author’s inicial short-stories and his critics of that time, in order to verify their organicity in relation to his work as a whole (“Frei Simão”, “Virginius, narrativa de um advogado” and “Casada e viúva”, published in 1864; “Questão de vaidade”, published from 1864 to 1865, and “Confissões de uma viúva moça”, published in 1865). The texts will be consulted in their primary source, Jornal das Famílias, the magazine which had weekly publications from 1863 to 1878. In spite of being considered prolix and romanticized, the purpose is to observe the author’s short-stories beyond what have been already stated. Therefore, the present reading will consider the author’s condition as a shortstory teller, the magazine in which the short-stories are, the relation of the texts with the people reading level at that time, the influence of the literary movements, the audience prefigured by the magazine edition and, at last, from the analysis of Machado de Assis’ critical production, read the short-stories as a way to concretization of a feasible literary project genuinely “machadiano”. Umberto Eco’s concepts of “model-author” and “modelreader” will guide the analysis of the first short-stories, in order to understand the author’s intentions from the narrative strategies presents in the texts.
Tratamento a plasma de nanofibrilas de celulose para aplicação em compósitos
(Universidade Federal de São Carlos, 2017-03-15)
Silva, Bárbara Estefânia de Almeida
;
Silva, Adriana de Oliveira Delgado
;
https://lattes.cnpq.br/2707979913713089
;
https://lattes.cnpq.br/9782396193172212
The application of cellulose nanofibrils to the production of composites has been studied and presents promising results, mainly due to the abundance of the material, which is of a renewable source, and to its low cost. However, the presence of the hydroxyl groups in their chain and their storage in aqueous solutions limits their application as reinforcement in nonpolar matrix composites. In this context, this work aimed to modify the wettability and adhesion properties of films of cellulose nanofibrils to apolar matrices, through plasma treatment. For this, nanocellulose films with thickness of 38 ? 8 ?m were produced by the casting method, from a suspension of nanofibrils in water. The atomic force microscopy characterization (AFM) of the suspended nanofibrils indicated that most of them have an average diameter of less than 75 nm. Each film obtained, after drying the suspension, was then cut into 13 samples with 2 x 1 cm, 12 of which were exposed to plasma and one stored as untreated. Three films were treated with oxygen plasma, with excitation power of 150 W, for 30 minutes and pressure of 0.1, 0.3 and 0.5 Torr. Another three films were treated with sulfur hexafluoride plasma at pressures of 0.1, 0.2 and 0.3 Torr, with a power of 150 W for 15 minutes. It was observed that weight loss was greater than 40% for the films treated with the most extreme conditions oxygen and sulfur hexafluoride. The results also showed that the treatments with sulfur hexafluoride promoted the reduction of the receptivity of the samples to the liquids, with contact angles of approximately 60º for water and 50º for diiodomethane. The profilometry technique revealed that the roughness of the films varied after the treatment with oxygen and sulfur hexafluoride, but the high error bars impede a definitive conclusion on the tendency of these variations. The X-ray diffraction analysis (XRD) indicated no significant change in the crystallinity of the samples with the treatments. In the Fourier Transform Infrared absorption spectra (FTIR), a C-F bonding related peak appeared for the 0.3 Torr sulfur hexafluoride treated sample, indicating the presence of fluorine in that sample. The scanning electron microscopy (SEM) allowed the visualization of the changes in the topography of the films, due to the etching processes resulting from the action of the plasma and the films ruptures caused by the high removal of surface material. In order to test the incorporation of treated films into composites using polyolefins as the matrix, polyethylene pellets were solubilized in xylene for the production of composite films. The treated and untreated nanocellulose films were placed in Petri dish jointly to the polyethylene films still dissolved and left at room temperature. After drying, adhesion between the films was tested through the adhesive tape test, resulting in class-zero adherence, according to the technical standard. It is believed that the lack of adhesion is a result of the composite production method that should be optimized for future work, in order to provide a better investigation of the effects of plasma on the surface properties of the film of cellulose nanofibrils.
O problema de localização-roteamento em dois níveis com janelas de tempo e múltiplos entregadores
(Universidade Federal de São Carlos, 2017-03-16)
Gulfo, Juan Sebastián Poveda
;
Pureza, Vitória Maria Miranda
;
https://lattes.cnpq.br/9202201560058916
;
https://lattes.cnpq.br/4771432941095286
The Vehicle Routing Problem with Time Windows and Multiple Deliverymen (VRPTWMD) is a real-life goods distribution problem that arises in regions with high customer density and where the delivery vehicles face trafic and parking dificulties. Because of these dificulties, the distribution is carried out in two levels; each vehicle travels between groups (clusters) of customers close to each other, and for each cluster, the delivery of the products is performed by the driver and possibly some helpers traveling with the driver and who visit the customers on foot from the vehicle stop location. The use of multiple deliverymen is a practice of companies for reducing service times in the clusters, which in turn allows increasing the number of customers served within working hours. The vast majority of the works on the theme assumes that the vehicles’ parking spots and the subset of customers in each cluster is previously determined and the routing is limited to the first level with service times in the cluster defined according to the number of deliverymen. In this research we incorporate secondleveldecisions into the VRPTWMD, leading to the extension henceforth called Two-echelon Location-Routing Problem with Time Windows and Multiple Deliverymen (2E -LRPTWMD). The 2E-LRPTWMDaims, therefore, to obtain the location, routing and scheduling of vehicle parking spots, the number ofdeliverymen in each vehicle, as well as the assignment, routing and scheduling of customer subsetsserved by the deliverymen in each vehicle from the selected parking spots. These decisions must betaken in order to minimize the total cost to serve all demands. With this objective, we propose amathematical model whose main feature is the consideration of service times of clusters as not onlyexplicitly dependent on the number of deliverymen allocated to the routes, but also on the distances between the selected customers that comprise the clusters. Computational experiments with smallsizedinstances (12 customers) validate the model while a discussion on the model/solution methodbehaviour under diferent scenarios is performed using instances up to 50 customers generated fromthe Solomon (1987)’s examples for the Vehicle Routing Problem with Time Windows. Additionally,we show that the model/method has a better performance when tackling instances based on real datainvolving up to 50 customers.
Organocatálise assimétrica e sistemas vinílogos: adição de 1,3-oxazolina-2-tionas a aldeídos a,b-insaturados
(Universidade Federal de São Carlos, 2017-03-16)
Matsuo, Bianca Taeko
;
Paixão, Márcio Weber
;
https://lattes.cnpq.br/3773908504964104
;
https://lattes.cnpq.br/7132413005598347
The use of organic molecules in stereoselective transformations has emerged as a powerful tool for the efficient construction of chiral skeletons and complementing existing methods. Currently, a great variety of reactions using organocatalytic methods (Diels-Alder and cycloadditions in general, Mannich and Michael aldol reactions, epoxidation, α-halogenation, amination, among others) has been developed for the formation of new C-C bonds, being important for the continuous advances of this field of asymmetric catalysis the application of new methodologies, catalysts and substrates. In this work, we explored the reactivity of 1,3-oxazoline-2-thiones scaffolds as Michael donors in organocatalyzed conjugated reactions to a,b-unsaturated aldehydes. By using the Jørgensen organocatalyst it was possible to obtain the functionalized heterocyclic compounds in high yield with ee up to 99% and 9:1 d.r.
Avaliação do papel dos receptores GABAA-benzodiazepínicos da ínsula na nocicepção de camundongos que conviveram com coespecífico em condição de dor crônica
(Universidade Federal de São Carlos, 2017-03-17)
Zaniboni, Caroline Riberti
;
Souza, Azair Liane Matos do Canto de
;
https://lattes.cnpq.br/2352004564367849
;
https://lattes.cnpq.br/4350264853966672
Empathy for pain is the ability to feel other’s pain and recent studies suggest this capacity between rodents. GABAergic system has receptors in brain structures involved in emotional processes as the insula, which is known to play a role in modulation of pain and empathy. The present study investigated the role of Benzodiazepine-GABAA system and insula’s Benzodiazepine-GABAA receptors on social modulation of pain induced by cohabiting with a mouse submitted to a neuropathic pain model. The role of GABA system was assessed by systemic treatment of midazolam (MDZ) (0.5, 1.0, 2.0 mg/kg), a GABAA agonist (Exp. 1) and the role of GABAA receptors of insula by MDZ microinjections (3 and 30 nmol/0.1 μl) in the structure (Exp. 2). Male Swiss mice (n=8-10/group) (Ethics: CEUA/UFSCar N° 47520904) were housed in pairs and after 14 days were divided into two groups: cagemate nerve constriction (CNC), in which one animal of each pair was subjected to sciatic nerve constriction and cagemate sham (CS), one animal from each pair was subjected to the same surgery but without constriction. On Experiment 1, in the 28th day of cohabiting, the observer cagemate, who lived with a CS or CNC, received injections of saline or midazolam (0.5, 1.0 and 2.0 mg/kg, subcutaneous, s.c) and, 30 minutes after, were submitted to the writhing test for 5 minutes to evaluate nociception. In Experiment 2, the protocol was the same, but in 23th day of cohabiting, each observer cagemate was surgically implanted with guide cannula bilaterally in the insula. In the 28th day, the observer cagemate received intra-insula injections of saline or midazolam (3 or 30nmol/0.1 μl) and after 10 minutes was submitted to writhing test. In both experiments, two-way ANOVA followed by post hoc Duncan test revealed that the number of writhes was higher in CNC animals than the CS animals (P < 0.05). In Experiment 1, the higher dose of midazolam (2.0 mg/kg) decreased the number of writhes induced by living with a pair in neuropathic pain (P < 0.05), but this response was not changed by intra-insula midazolam (P < 0.05, Experiment 2). Results suggest that cohabitation in pairs with chronic pain condition induces hypernociception and benzodiazepine-GABAA system is possibly involved in the social modulation of pain, but not mechanisms located within the insula.
Otimização com aprendizado autônomo para programação da produção com sequências de instâncias heterogêneas
(Universidade Federal de São Carlos, 2017-03-17)
Frascati, Giuliano
;
Tavares Neto, Roberto Fernandes
;
https://lattes.cnpq.br/6954662222457389
;
https://lattes.cnpq.br/2583033883535828
Many scheduling problems, but also in Advanced Planning and Scheduling (APS), are NP-Hard. This project addresses a scheduling problem in a single machine environment with sequence dependent setup times. It is possible to partially outsource the demand restricting that there are no delays for delivering of the orders, aiming to minimize the cost for outsourcing. Evolutionary Algorithms (EA) represent a fast solution strategy for NP-Hard problems. However, researchers in the field of evolutionary computation say that EAs depend significantly on the configuration of their parameters. This work investigates in the scheduling and APS literature, how the authors who develop EAs determines the parameterization and evaluation of their algorithms, also presenting which strategies are suggested as state of the art for automatic tuning of EAs. This thesis states an innovative strategy for automated configuration of EAs, including a new paradigm for optimization in streams of heterogeneous instances called ALO (Autonomous Learning Optimization). This new paradigm aims to solve integratelly an optimization problem and parameterization of the configurable algorithm with an autonomous decision process for detecting heterogeneities within the sequence of instances.
Condições de produção e legitimação da etnomatemática
(Universidade Federal de São Carlos, 2017-03-17)
Passos, Caroline Mendes dos
;
Vilela, Denise Silva
;
https://lattes.cnpq.br/8155152145332951
;
https://lattes.cnpq.br/2797810046671958
How to map the research in ethnomathematics in Brazil? This was the initial question and the starting point for the constitution of the present study. To study the conditions of production and legitimization of ethnomathematics as a research area was the main objective pursued. The methodological orientation was situated in the field of sociology from a perspective that inaugurates ways of looking at aspects inherent to mathematical education. In the case of this investigation, we studied ethnomathematics. This is a way of looking, which, in this investigation, takes the sociological perspective proposed by Pierre Bourdieu (1930-2002) as a reference. Bourdieu was a French sociologist known and recognized for his boldness in the choice of objects for analysis, but, more than that, in the way he analyzed them, which took into account the relations, power games, accumulated capitals and alliances that were settled in a space of struggle. This space was characterized by him as the field. From this perspective, we come to understand ethnomathematics as a research issue that is constituted by studies and activities conducted by researchers who are involved with the theme and also as part of a process of constitution that favored its production. Thus, a part of the studies that we conducted involved an analysis of the emergence process of ethnomathematics as a research issue, from a perspective that focused on the historical aspects that favored the emergence of ethnomathematics as a research area and its relevance as a broader way to research mathematical education. Still on this emergence process, we focused on the trajectory of a main agent of this movement - the Brazilian researcher Ubiratan D'Ambrosio. He was an agent who, for the positions he occupies - which are associated with the capital he accumulated in his trajectory -, stood out as an important person in the institution of ethnomathematics as a research issue, introduced the term "ethnomathematics" in the academic setting, and formulated the principles that are the foundation of the area of studies. An agent who, in mobilizing strategies to promote this movement, also promoted his own movement in the field of mathematics. In the other part of our studies, the activities registered by ethnomathematical researchers in their Lattes resumes are understood as those that legitimize ethnomathematics. We considered legitimacy as a process involving production, dissemination, promotion, and circulation, and which constitutes the market where the discourse that establishes ethnomathematics as a practice circulates. A market that is established based on relations between producers and consumers. The processes that involved the production and legitimation of ethnomathematics as a research area were understood as led by the agents and constituted by their activities, which, when recorded in their Lattes resumes, convey what should or should not be understood as ethnomathematical practice. Such practices, considered to be discursive, are those formulated by the producing agents, the intellectual elite of research subjects, the ones who dictate the rules of the game and establish what should or should not be considered ethnomathematics.