Browsing by Issue Date, starting with "2017-08-04"

Filter results by year or month

Now showing 1 - 20 of 13890

Filtragem automática de opiniões falsas: comparação compreensiva dos métodos baseados em conteúdo
(Universidade Federal de São Carlos, 2017-08-04)
Cardoso, Emerson Freitas
;
Almeida, Tiago Agostinho de
;
https://lattes.cnpq.br/5368680512020633
;
https://lattes.cnpq.br/7714557242920689
Before buying a product or choosing for a trip destination, people often seek other people’s opinions to obtain a vision of the quality of what they want to acquire. Given that, opinions always had great influence on the purchase decision. Following the enhancements of the Internet and a huge increase in the volume of data traffic, social networks were created to help users post and view all kinds of information, and this caused people to also search for opinions on the Web. Sites like TripAdvisor and Yelp make it easier to share online reviews, since they help users to post their opinions from anywhere via smartphones and enable product manufacturers to gain relevant feedback quickly in a centralized way. As a result, most people nowadays trust personal recommendations as much as online reviews. However, competition between service providers and product manufacturers have also increased in social media, leading to the first cases of spam reviews: deceptive opinions published by hired people that try to promote or defame products or businesses. These reviews are carefully written in order to look like authentic ones, making it difficult to be detected by humans or automatic methods. Thus, they are used, in a misleading way, in attempt to control the general opinion, causing financial harm to business owners and users. Several approaches have been proposed for spam review detection and most of them use techniques involving machine learning and natural language processing. However, despite all progress made, there are still relevant questions that remain open, which require a criterious analysis in order to be properly answered. For instance, there is no consensus whether the performance of traditional classification methods can be affected by incremental learning or changes in reviews’ features over time; also, there is no consensus whether there is statistical difference between performances of content-based classification methods. In this scenario, this work offers a comprehensive comparison between traditional machine learning methods applied in spam review detection. This comparison is made in multiple setups, employing different types of learning and data sets. The experiments performed along with statistical analysis of the results corroborate offering appropriate answers to the existing questions. In addition, all results obtained can be used as baseline for future comparisons.
Novas abordagens na síntese de heterociclos com potencial aplicação na síntese de moléculas bioativas
(Universidade Federal de São Carlos, 2017-08-04)
Alves, Tânia Mara Ferreira
;
Ferreira, Marco Antonio Barbosa
;
https://lattes.cnpq.br/6874055640224407
;
https://lattes.cnpq.br/2711137157839870
Cobalt-catalyzed oxidative cyclization of gem-disubstituted conjugated alkenols: In this part of the work we applied the Mukaiyama Oxidative Ciclization under oxidative and reduced termination conditions aiming the preparation of trisubstituted 2,5,5-THFs-trans from gemdisubstituted aromatic conjugated olefins with different electronic properties. The THFs were obtained only under reduced termination conditions, with of 32-44% of yields. Under oxidative termination conditions, only products from secondary radical reactions that competed with the oxidative cyclization reaction were observed. In addition, the diastereoselectivity involved in this process was evaluated,, which in this case were obtained in 17-46% of yields and dr 2.5:1 to 5.4: 1. Preparation of 1H-1,2,3-triazole under more sustainable conditions: In this second part of the work the main objective was to develop an one-pot methodology for the preparation of 1H-1,2,3-triazoles from nitrolefins. This methodology is inserted in a concept of a more sustainable chemistry, since the obtaining heterocyclics was carried out through a metal-free approach, using the green solvent PEG400, and the direct use of sodium azide. The 1H-1,2,3-triazoles were obtained via one-pot reaction in good yields (54-80%).
Desenvolvimento de materiais mesoporosos baseados em sílica oriunda de biomassa para utilização como sistema remediador de hidrocarbonetos policíclicos aromáticos
(Universidade Federal de São Carlos, 2017-08-04)
Costa, José Arnaldo Santana
;
Silva, Caio Marcio Paranhos da
;
https://lattes.cnpq.br/7793686262868668
;
https://lattes.cnpq.br/5913578662870885
This work describes the synthesis and characterization of mesoporous materials from the use of amorphous silica extracted from rice husk ashes (RHAs), as well as the preparation of mixed matrix membranes (MMMs) using the mesoporous materials as filler materials to be used in the remediation of the polycyclic aromatic hydrocarbons (PAHs). The mesoporous materials were synthesized by the hydrothermal method and the MMMs by casting. It was possible to observe that the acid treatment did not alter the molecular structure of the RHSs, as well as there was an increase in the percentage of SiO2 in the thermal stability. The RHAs presented an amorphous silica nature, with the characteristics of a fine powder of white color, with type IV isotherms and H1 type hysteresis, and high surface area values. The hydrothermal method was efficient in the synthesis of the mesoporous materials, which presented TGA curves and characteristic bands of the formation of the amorphous condensed silica framework, typical of mesoporous materials of the M41S family, with high surface area. The casting method was efficient for the preparation of the MMMs, which showed a good dispersion of the mesoparticles incorporated, small-angle ordering and a small increase in the Tg values of the MMMs with the incorporation of the MCM−41−NH2 (CCA). The adsorption tests showed that there was an increase in the adsorbed amount (qe) with the increase of the initial concentration of the HPAs, adsorbent amount, contact time, and temperature, however pH variation was not significant. The adsorption kinetics was relatively fast and followed the non-linear pseudo-second order model, and the isotherms obtained were more adequate to the theoretical Langmuir model. The values of qe found for the mixture of HPAs Naf, B[b]F, B[k]F, and B[a]P were in the same order of magnitude for all adsorbent materials tested: Naf < B[a]P < B[k]F < B[b]F due to the hydrophobic effect. The transport properties were more influenced by the incorporation of the MCM−41−NH2 (RHA) into PSf−Ac than the addition of the PABA−MCM−41 (RHA) in PES, as the best results of the rate of permeation, rate of retention, and percentage of removal were obtained for the MMMs based on PSf, however the pure PSf and PES membranes presented similar results.
Ações pública e privada no processo de ocupação de Ribeirão Preto: do núcleo Antônio prado a atuação do GDU Grupo de Desenvolvimento Urbano
(Universidade Federal de São Carlos, 2017-08-04)
Melo, Rose Elaine Borges de
;
Silva, Ricardo Siloto da
;
https://lattes.cnpq.br/5346985934880710
;
https://lattes.cnpq.br/8602449876992473
The work studies the performance of the different agents of the real estate market in the process of occupation of the South sector, located in the geographical periphery of the Ribeirão Preto´s City, from 1990 to 2010. The study was based on the analysis of the actions of the productive agents of the real estate market, especially the UDG Urban Development Group (association of builders, developers and land owners) and actions of the municipal public power as a regulator of urban space. In this way, we analyze: the legislation through the urbanistic instruments of control of land use and occupation; Programs, urban projects and master plans through the concepts and guidelines used in the production and organization of urban space (occupation pattern, growth guidelines and urban structure); Public services through the implementation of infrastructure and urban equipment; And, allotments and condominiums horizontal and vertical through the projects approved in the Secretariat of Planning and Public Management of Ribeirão Preto. The results verify the hypotheses that guided the accomplish of this research: 1) in addition to socioespatial segregation center periphery, from its beginnings, the process of formation and expansion of Ribeirão Preto´s City presents a pattern of occupation where the high income population predominates in the southern region and the population of Low income in the north of the city 2) real estate agents such as developers, real estate developers and landowners, among others, acted in an organized way in the process of occupation of the South sector, located in the geographical periphery of the city of Ribeirão Preto, in the Period from 1990 to 2010 becoming the effective planners of this urban space.
Efeitos da diminuição do tamanho médio de partículas da frita nas propriedades dos esmaltes cerâmicos visando aplicação na esmaltação digital
(Universidade Federal de São Carlos, 2017-08-04)
Nieves, Leidy Johana Jaramillo
;
Melchiades, Fábio Gomes
;
https://lattes.cnpq.br/4469106561041487
;
Boschi, Anselmo Ortega
;
https://lattes.cnpq.br/3259846931278607
Nowadays Brazil is the second largest producer and consumer of ceramic tiles in the world. In the process of tile’s production, the decoration and glazing play a prominent role since they are responsible for technical and aesthetic properties of the product. Ceramic tile decoration underwent a revolution with the arrival of ink-jet technology. This technology has also started to become a focus of interest for glazing, creating the possibility of having a completely digital line in the manufacture processing. Accordingly, glazes must be adapted to requirements of this new technology. Among them, the particle size of the suspensions employed in the ink jet technology should be lower than that used in traditional glazes. In this context, this project evaluates the effect of the average particle size reduction on the properties of glazes, from their preparation, application, sintering and final product. The methodology of the project consisted in using an industrial frit applied to transparent glazes. The frit was ground to obtain four different granulometry particle sizes for the preparation of glazes. The materials were characterized by rheological analysis, applied layer and their interaction with digital inks. Finally, the sintering process and the characteristics of the fired product were monitored. The study showed that the main effect of the decrease in particle size was on the particle size distribution curve, which affected the packing of particles and this, in turn, affects the pore structure which affects the packing of the suspension, That is, rheological behavior and the characteristics of the applied layer of the glazes, showing that changes in the applied layer affected the subsequent stage as the decoration and the firing.
Correlações entre microestrutura, parâmetros térmicos e propriedades mecânicas de ligas de alumínio da série 5xxx solidificadas unidirecionalmente
(Universidade Federal de São Carlos, 2017-08-04)
Ogata, Cínthia Toshimi
;
Ishikawa, Tomaz Toshimi
;
https://lattes.cnpq.br/5726055117451807
;
Spinelli, José Eduardo
;
https://lattes.cnpq.br/8882038118634925
Processing high-Mg content Aluminum Alloys by continuous casting technics is considered an industry challenge. The present research aims to characterize 5xxx alloy series, considering composition based on the commercial alloy 5052 with different Mg contents (2.4wt.%, 2.6wt.% and 3.2wt.%, the latter intentionally extrapolated from the maximum limit) through transient directional solidification experiment. The results allowed to comprehend the effect of Mg content with respect to thermal parameters (cooling rate and VL- tip growth rate), microstructural parameters (primary and secondary dendritic spacing - Ai and À2) and mechanical properties (Brinell hardness) of different alloys. Microstructural analyzes were performed using polarized light microscopy and scanning electron microscopy (SEM) of samples taken from different ingot positions (between 3mm and 110mm from the water-cooled face). The experiments reached cooling rates between 7 and 30°C/s (considering the closest thermocouple to the bottom). The experimental growth law for microstructural evolution of Ai were obtained, resulting in: À1 = 640 TL 1/4 to the alloy with 2.4wt.%Mg and À1 = 300 TL 1/4 to the sample with 3.2wt.%Mg, in which experimental the exponent -1/4 is in agreement with the expression proposed by Jackson and Hunt modified by the analytical model of Garcia and Clyne. Secondary dendritic growth laws were also obtained concerning their variation with the growth rates, resulting in the following expressions:X2 = 27 VL-11 for the 5052-2.4wt.%Mg and X2 = 15.0 VL-11for the 5052-2.6wt.%Mg and 5052-3.2wt.%Mg* alloys. Thus, 5052 alloys containing higher Mg content may allow a significant decrease on X2 value for a certain VL. The hardness values were directly related to the size and distribution of the intermetallic particles and showed À2 as the main variable to affect mechanical properties for the tested alloys.
Faça no seu ritmo mas não perca a hora: tomada de decisão sob demandado usuário utilizando dados da Web
(Universidade Federal de São Carlos, 2017-08-07)
Silva, Manoela Camila Barbosa da
;
González, Sahudy Montenegro
;
https://lattes.cnpq.br/9826346918182685
;
lattes.cnpq.br/6820313110051762
In the current knowledge age, with the continuous growth of the web data volume and where business decisions must be made quickly, traditional BI mechanisms become increasingly inaccurate in order to help the decision-making process. In response to this scenario rises the BI 2.0 concept, which is a recent one and is mainly based on the Web evolution, having as one of the main characteristics the use of Web sources in decision-making. However, data from Web tend to be volatile to be stored in the DW, making them a good option for situational data. Situational data are useful for decision-making queries at a particular time and situation, and can be discarded after analysis. Many researches have been developed regarding to BI 2.0, but there are still many points to be explored. This work proposes a generic architecture for Decision Support Systems that aims to integrate situational data from Web to user queries at the right time; this is, when the user needs them for decision making. Its main contribution is the proposal of a new OLAP operator, called Drill-Conformed, enabling data integration in an automatic way and using only the domain of values from the situational data.In addition, the operator collaborates with the Semantic Web, by making available the semantics-related discoveries. The case study is a streamings provision system. The results of the experiments are presented and discussed, showing that is possible to make the data integration in a satisfactory manner and with good processing times for the applied scenario.
Microestrutura e propriedades mecânicas da liga AA6061 processada por deformação plástica severa em temperatura criogênica
(Universidade Federal de São Carlos, 2017-08-08)
Magalhães, Danielle Cristina Camilo
;
Kliauga, Andrea Madeira
;
https://lattes.cnpq.br/3527528295399928
;
Sordi, Vitor Luiz
;
https://lattes.cnpq.br/8364164402481940
The present work aimed two fronts: to characterize the mechanical behavior of the AA6061 alloy at cryogenic temperature, and to study the microstructural and properties evolution after cryogenic severe plastic deformation. Samples of AA6061 alloy were solution heat-treated and processed by conventional rolling, asymmetric rolling and equal-channel angular pressing (ECAP), both at room temperature and cryogenic temperature. After processing, such samples were treated for precipitation at 25 °C and at 100 °C, for different times. On the cryogenic mechanical behavior it was observed the suppression of the dynamic strain aging, which also allowed the ECAP processing without cracking. Uniform and total elongation and mechanical strength were always higher at -196 °C than at room temperature. The strain-rate sensitivity, despite having low values, becomes positive for cryogenic deformation, directly affecting the deformation capacity. Regardless of the processing route employed, a saturation of the hardness around 125 HV has been seen. The microstructures after cryogenic ECAP were very refined in relation to the starting material (average grain size up to 500 nm). In addition, it was observed a homogeneous strains distribution after cryogenic processing, with detection of several new fine grains from grain boundaries, which suggests recrystallization. The tensile tests results, after cryogenic processing in combination with artificial aging at 100 °C (48 hours), indicated an increase in uniform elongation. Regarding mechanical strength, the highest values were observed for extrusion at room temperature combined with artificial aging. In addition, there was to some static recovery during artificial aging, especially for cryogenic processing, which generates thermodynamically unstable microstructures. The density of dislocations, in fact, decreases with the prolongation of artificial aging time. Thus, the present study was based on a study of the cryogenic mechanical behavior of the AA6061 alloy, as well as the possibility of processing by cryogenic severe deformation.
GromaXy: uma ferramenta para integração do Galaxy com o GROMACS
(Universidade Federal de São Carlos, 2017-08-08)
Souza, Alfredo Guilherme da Silva
;
Trevelin, Luis Carlos
;
https://lattes.cnpq.br/5082419783043736
;
https://lattes.cnpq.br/0459570418915149
Considering the significant advances in biomolecular researches, the raise of various limitations is predicted. Thereby, reinforcing the link between science and technology, by introducing the new and effective development tools which can be used in a variety of scientific studies (i.e. Molecular Dynamics methods for drug discovery), becomes necessary. This method enables the realization of simulations in biomolecular studies in which atoms' behavior can be observed during a specific period of time. In the state of art various researches related to development of tools, whose main goal is facilitating Molecular Dynamics studies, are encountered. The GROMACS is one of these tools that is known as an open-source tool that has been used in lots of research projects. Due to the complexity of manipulating the GROMACS, the current study presents a new tool called GromaXy, which aims at providing a new interaction way with GROMACS, by introducing a new graphical interface which is much more convenient than the GROMACS command line. In addition to providing a new interaction way with GROMACS, the GromaXy also offers an adoptation of Atom Validation, which is another tool that has been developed in one of the previous studies. Atom Validation identifies the absent atoms in protein structure and show the to the user in form of a list. GromaXy was developed using a well-known framework in bioinformatic area called Galaxy. This framework was preferred due to its simple environment, the ability of sharing the work history and the history of realized experiments, enabling the high-level storage of data related to the trajectory of simulation process. The GromaXy was chosen as an adequate name which presents the join of Galaxy and GROMACS.
Visualização, caracterização e manipulação de paredes de domínios em filmes finos ferroelétricos
(Universidade Federal de São Carlos, 2017-08-10)
Gonçalves, André Marino
;
Eiras, José Antônio
;
https://lattes.cnpq.br/6653223814715498
;
https://lattes.cnpq.br/0563057979926309
In this work, conductivity in ferroelectric domain walls, in materials whose domains are insulating, was investigated at the nanoscale using a combination of techniques based on atomic force microscopy. Polycrystalline and epitaxial Pb(Zr,Ti)O3 tetragonal thin films were synthesized by different routes, with crystallization after deposition (ex-situ) and during deposition (in-situ). The manipulation of the domain structures and properties of the walls was explored, from the synthesis parameters, aiming the obtaining, optimization and manipulation of the conductivity in walls of ferroelectric domains. In polycrystalline films, complex domains composed of 180° and 90° walls were obtained. The reorientation of the polarization by the application of localized electric field, using the AFM tip, revealed substantially different responses in thin films with different thicknesses and grain sizes. Through the epitaxial growth path, films oriented in the [001] direction with monodomain structure and, with multidomain structure with walls of 90 °, were obtained by changing the epitaxial strain exerted on the film, using different substrates. With the application of localized electric field using the AFM tip, it was demonstrated the possibility of creation/destruction, with a certain level of control, of both 180° and 90° walls. The investigation of the local conductivity revealed that, in both the epitaxial and the polycrystalline films, the 90° walls are more conductive than the 180° walls, related to the greater deviation of the electroneutrality position, imposed by the mechanical restrictions on the 90° walls. It was also observed that, using oxides, the conductivity is stable, whereas with metal electrodes there is a decay of the current over time, possibly related to the trapping of carriers due to oxygen vacancies accumulated in the film/metal electrode interface. Finally, the processing route was also decisive in the electrical properties. Better electrical responses were obtained in films crystallized during the deposition than in films crystallized after the deposition. The observed differences are possibly related to the quality of the interface obtained by the different routes.
A gestão por competências em Universidades Federais : um estudo comparado na perspectiva do campo CTS
(Universidade Federal de São Carlos, 2017-08-10)
Perseguino, Silvana Aparecida
;
Pedro, Wilson José Alves
;
https://lattes.cnpq.br/8135701448186851
;
https://lattes.cnpq.br/7708875177512113
Considering the social commitment played by the federal universities, as producers of new knowledge, and the training of qualified professionals and researchers able to contribute to the development of the society, this research develop a critical analysis, following the spectrum of the field of studies Science, Technology and Society (STS), regarding the parameters detailed in the Decree no. 5.707, from 2006/02/23, which established the National Policy for Human Resources Development, encouraging the paradigm of competences within the public sector, and some of the implications for the federal universities. The specific objectives are: 1) to draw the panorama regarding implementation of the management by competences model within the federal universities from the perspective of the Human Resources Management area; 2) To develop a comparative study between two institutions located in the State of São Paulo, in order to identify the institutional specificities, structure and parameters adopted by the people management area in its management model; 3) to suggest guidelines for the model of management by competences in universities based on the social commitment approach. The qualitative-quantitative methodology combines exploratory/descriptive and empirical research, following the literature review, survey and case studies, using content analysis to analyze the results. The results seem to demonstrate that the adoption of the management by competences in the context of federal universities is not consolidated and there are challenges to be faced that may contemplate the complexity of the environment of these institutions. It was also possible to identify that the field of STS studies can contribute to construct guidelines that consider the complexity of both, the model and the universe of the federal higher education institutions in general.
A constituição profissional do professor em início de carreira: percepções dos egressos dos cursos de licenciatura da UFSCar- Sorocaba
(Universidade Federal de São Carlos, 2017-08-10)
Dessotti, Elise
;
Gama, Renata Prenstteter
;
https://lattes.cnpq.br/4153572041829838
;
https://lattes.cnpq.br/8821776329203903
The present work has the objective to describe and understand the professional constitution of graduated students from teaching courses of UFSCar campus Sorocaba. The methodology is qualitative and interpretative, it has used as instruments to build the data a survey with the graduated students and semi-structured interviews with graduated students that became teachers in order to deepen the data. To understand the context of the research it has been done a documental analyses of the Political Pedagogical Project, the curricular matrixes and the general and specific curricular guidelines of each course. The first step of the building data was the application of a survey to all the graduated students of the teaching courses (Full time and nocturnal Biology, Geography, Mathematics, Chemistry and Physics) to create and analyze it has been used as categories three moments from teaching formation: initial formation, career beginning and continuous training (PACHECO; FLORES, 1999). The second step of the data building was the interviews with one graduated student from each course and to analyze were used the theoretical bases about teaching formation which involves initial and continuous training (PACHECO; FLORES, 1999; VAILLANT; MARCELO, 2012) the career beginning and its sustainability (HUBERMAN, 1997; MARCELO; VAILLANT, 2012; GUARNIERI, 2005. LIMA, 2006; HARGREAVES, 1998; FULLAN; HARGREAVES, 2000) and about professional identity (HALL, 2015; DUBAR, 2009) The main results highlighted that the graduated students feel secure about the specific contents and acknowledge that the professional constitution is a complex process, that it may gain contribution if university and school establish associations to diminish the distance from the institutions and between the theoretical-academic contents and practical. In relation to the career beginning and its sustainability the graduated students describe difficulties with the responsibilities and the conditions of the teacher work and the confrontation of the “real shock” (HUBERMAN, 1997); despite the difficulties, they keep themselves in the career because they find themselves in the students´ relationship and they like the profession. The professional identity is build along the lived experiences, but, they must deal with an identity crises (HALL, 2015) because the expectations from the scholar community are not the same as their own. They highlight the initial formation has a huge contribution to the career beginning and the professional constitution, but even bigger is the contribution from the school.
Ética e ontologia em Bergson
(Universidade Federal de São Carlos, 2017-08-10)
Vieira, Marcelo Marcos Barbosa
;
Silva, Franklin Leopoldo e
;
https://lattes.cnpq.br/4705628195902884
;
https://lattes.cnpq.br/8316324326130024
L’investigation de la liberté qui inaugure la philosophie de Bergson est, elle aussi, l’origine d’une nouvelle conception sur l'existence. Définie comme source de création, la durée interne de la conscience qui émerge dans l’acte libre constitue l’expérience à partir de laquelle d’autres dimensions de la réalité seront abordées. Nous cherchons, alors, approfondir les rapports entre l’éthique et l’ontologie présents dans la philosophie de la durée, en ayant comme référence les trois niveaux de conscience travaillés par Bergson : conscience humaine, conscience vitale et conscience mystique.
Kierkegaard e o Tractatus
(Universidade Federal de São Carlos, 2017-08-11)
Barros, Wagner de
;
Ferraz Neto, Bento Prado de Almeida
;
https://lattes.cnpq.br/0084436724293824
;
https://lattes.cnpq.br/2571015424053997
This study aims to investigate if the relationships between Kierkegaard and the Tractatus Logico-Philosophicus can be assessed from considerations about the nature of language. That would provide a philosophical justification for Wittgenstein’s claim that "Kierkegaard is the deepest thinker of the last century", as an alternative to the view adopted by some scholars that the common point between the two authors is the split between the sphere of values and the sphere of facts. It would also be possible to establish a link between the reflections of the Danish philosopher and Wittgenstein’s approach to ethics in the Tractatus; this is a point that was acknowledged by scholars but remains unclear.
Função colinérgica do núcleo do trato solitário comissural nas respostas cardiorrespiratórias à hipóxia e hipercapnia
(Universidade Federal de São Carlos, 2017-08-11)
Furuya, Werner Issao
;
Zoccal, Daniel Breseghello
;
https://lattes.cnpq.br/1958567557189244
;
Colombari, Débora Simões de Almeida
;
https://lattes.cnpq.br/1684467594359403
The nucleus of the solitary tract (NTS) is the primary site of visceral afferents, such as baroreceptors and arterial chemoreceptors. Recent data from our laboratory have shown that the microinjection of acetylcholine (ACh) into the commissural moiety of the NTS (cNTS) of decorticated arterially-perfused in situ preparations of male juvenile rats did not change the sympathetic nerve activity (SNA), but increased the phrenic nerve activity (PNA). Furthermore, we demonstrated that the ACh-induced responses in cNTS involve the activation of both nicotinic and muscarinic receptors. However, nicotinic receptors seem to play a more relevant role in the control of breathing, especially considering that such receptor antagonism promotes a decrease in the KCN- activated peripheral chemoreflex tachypneic response. However, the effects of specific nicotinic and muscarinic agonists in the cNTS on respiratory and sympathetic responses have not been studied yet. Once established the involvement of nicotinic receptors in the cNTS on peripheral chemoreflex ventilatory responses activated by cytotoxic hypoxia (KCN), we also evaluated the involvement of the cholinergic system in the cNTS on respiratory and sympathetic responses induced by hypercapnia or 24 h sustained hypoxia. Therefore, this project proposed to study the effects of selective activation of distinct cholinergic receptors in the cNTS on respiratory and sympathetic activities and the role of the cholinergic system in cNTS on sympathetic and respiratory activities reflex changes in response to hypercapnia or sustained hypoxia. We observed that the injection of both nicotinic and muscarinic agonists in the cNTS induces an increase in SNA and changes in the respiratory modulation pattern. The nicotinic agonist induces a decrease in respiratory frequency, as well as the blockade of the enzyme acetylcholinesterase. It was also observed that the cholinergic agonists promote an increase in the amplitude and duration of the pre-inspiratory (pre-I) period of the hypoglossal nerve and also increased the amplitude of the vagus nerve. When it comes on the protocols involving hypoxia, we observed that the cholinergic antagonists injected into the cNTS of rats previously exposed to hypoxia promoted a decrease in sympathetic activity, increased respiratory frequency, decreased hypoglossal nerve amplitude, and decreased post-inspiratory peak amplitude of the vagus nerve, but only the muscarinic antagonist decreased phrenic nerve amplitude and hypoxia-induced hypoglossal nerve pre-I increase. Regarding to the experiments with hypercapnia, we verified that the nicotinic antagonist in the cNTS inhibited the hypercapnia-induced increase in pre-I of the hypoglossal nerve. In addition, the nicotinic antagonist injected into the cNTS also potentiated the recruitment of late-E activity from the abdominal nerve. Taken together, the responses observed with the cholinergic agonists and injected into the cNTS, as well as the antagonists upon hypoxia, suggest the involvement of cholinergic pathways in the cNTS in the modulation of sympathetic and respiratory responses to sustained hypoxia. On the other hand, it seems that only nicotinic receptors in the cNTS are involved in hypercapnia-induced increase in pre-inspiratory activity and active expiration.
Análise e subjetividade : a gênese do "eu" no primeiro Wittgenstein
(Universidade Federal de São Carlos, 2017-08-11)
Michetti, Gustavo Gueraldini
;
Ferraz Neto, Bento Prado de Almeida
;
https://lattes.cnpq.br/0084436724293824
;
https://lattes.cnpq.br/3135514929921903
This dissertation aims to understand the importance of the subject to the philosophy of the first Wittgenstein. Part of the thesis that João Vergílio Cuter develops in his article "Por que o Tractatus necessita de um sujeito transcendental?" Cuter clarifies that, in the Tractatus, the subject is characterized as a logical necessity, responsible for naming and operating on the meaning of a proposition. The purpose of this dissertation is to examine, in the texts that precede the work of 1921, the genesis of this subject absolutely necessary for the constitution of the propositional meaning. To that end, I examine how the concept of analysis is closely linked to the concept of proposition in the years 1913 and 1914, in Notes on Logic and Notes dictated to Moore. I analyse how, in the Notebooks (1914-1916), this concept constitutes a problem for the autonomy of logic and for the task of philosophy. Later, in the 1915 and 1916 notes, it is noted that the "I" is closely linked to the resolution of this problem. With this examination, it is possible to recognize that the notion of subject is fundamental for the resolution of the questions present in the philosophical path of the first Wittgenstein and, therefore, it is possible to establish the genesis of this notion for the Tractatus.
Seleção de modelos multiníveis para dados de avaliação educacional
(Universidade Federal de São Carlos, 2017-08-11)
Coelho, Fabiano Rodrigues
;
Novelli, Cibele Maria Russo
;
https://lattes.cnpq.br/1011098065426388
;
https://lattes.cnpq.br/1142248575230930
When a dataset contains a hierarchical data structure, a possible approach is the multilevel regression modelling, which is justified by the significative amout of the data variability that can be explained by macro level processes. In this work, a selection of multilevel regression models for educational data is developed. This analysis is divided into two parts: variable selection and model selection. The latter is subdivided into two categories: classical and Bayesian modeling. Traditional criteria for model selection such as Lasso, AIC, BIC, and WAIC, among others are used in this study as an attempt to identify the factors influencing ninth grade students’ performance in Mathematics of elementary education in the State of São Paulo. Likewise, an investigation was conducted to evaluate the performance of each variable selection criteria and model selection methods applied to fitted models that will be mentioned throughout this work. It was possible to conclude that, under the frequentist approach, BIC is the most efficient, whereas under the bayesian approach, WAIC presented better results. Using Lasso under the frequentist approach, a decrease of 34% on the number of predictors was observed. Finally, we identified that the performance in Mathematics of students in the ninth year of elementary school in the state of São Paulo is most influenced by the following covariates: mother’s educational level, frequency of book reading, time spent with recreation in classroom, the fact of liking Math, school global performance in Mathematics, performance in Portuguese, school administrative dependence, gender, father’s educational degree, failures and age-grade distortion.
Friction riveting of aluminium alloy 6056-T6 with short-glass-fiber-reinforced polyamide 6 composite
(Universidade Federal de São Carlos, 2017-08-11)
Proença, Bruno Cordeiro de
;
Amancio Filho, Sergio de Traglia
;
https://lattes.cnpq.br/7609614295379921
;
Canto, Leonardo Bresciani
;
https://lattes.cnpq.br/7287108960864123
Friction Riveting (FricRiveting) is a relatively new joining technique for metal-polymer hybrid structures. This master thesis was carried out to investigate the FricRiveting process for polyamide 6 reinforced with 30 wt% short glass fiber (PA6-30GF) and aluminum alloy 6056-T6. These materials were selected because of their current joint use in automotive structures. AA6056-T6/PA6-30GF friction-riveted joints were successfully produced. Peak temperatures monitored for the process achieved between 323 °C and 399 °C leading the plastic deformation and thus anchoring of the rivet. The metallic rivet had its microstructure changed during the process, with dynamic recovery and recrystallization being observed in the anchoring zone. Microhardness in the metallic rivet decreased by 40 % of the base material hardness in the anchoring zone, due to a possible dissolution of the precipitates in the aluminum matrix and dynamic recovery and recrystallization. Polyamide 6 degradation was investigated by viscosity measurements and ATR/FT-IR, the joint with the highest level of degradation showed a reduction of 19 % on viscosity average molecular weight and an increase of 2.4 % of the carbonyl index in relation to the base material. Despite this reduction of properties, the friction-riveted joints had a good mechanical performance under tensile loading. Two joining conditions fractured through the metallic rivet outside the composite plate, achieving 92 % of the ultimate tensile strength of the metallic rivet. The influence of the process parameters on the process temperature, viscosity average molecular weight and ultimate tensile force were studied through Box-Behnken Design of experiment, response surface methodology and analysis of variance. Regression equations for these responses were estimated and validated, and an optimized condition was selected. Post joining heat treatment was performed on the optimized joining condition, resulting in an increase of the joint ultimate tensile force up to 99 % of the metallic rivet ultimate tensile force. The durability of the optimized joint was evaluated through natural weathering. An expected negative effect of weathering on the joint ultimate tensile force was observed, strength decrease of 8.4 % after 6 months and 15.5 % after 12 months of exposure.
A perspectiva da atividade do encanador: o caso do trabalho de manutenção no serviço público de saneamento básico na região metropolitana de Belém
(Universidade Federal de São Carlos, 2017-08-11)
Moreira Neto, Lauro de Souza
;
Menegon, Nilton Luiz
;
https://lattes.cnpq.br/5461487552981919
;
https://lattes.cnpq.br/2266283813589742
This current research had the objective of investigating the plumber's activity in the water supply service, which is a production system in which maintenance activities are essential to guarantee an important public service from the public health point of view. The waste of water also creates some negative points from the economic and environmental point of view. The workers who are involved in this activity face some ergonomics constraints in the service execution, which consequences reflect on sickness and accidents. Besides economic, environmental and work aspects, the study of these activities has an academic relevance. The case study was developed with the plumbers from the business units of a basic sanitation company that supplies almost the entire state of Pará, limiting the research only in the Metropolitan Region of Belém on the situation of leak removals in pipelines of water distribution network. Therefore, the aims of this research were to know, describe and explain, from the perspective of the activity, the work of plumbers and their forms of regulation that allow the development of the activity. Moreover, based on the understanding of the actual work, present knowledge mainly of hydraulic and some practical actions that can be useful for the improvement of the management services of the water supply. As the main guiding principle of the methodology, the Ergonomics Work Analysis (EWA) method was applied and some technical characteristics of EWA that depend on each studied situation, and which were used on the data collection, producing one synergy among the researcher and the reality of the work conditions. The research results indicated the necessity to understand how the plumbers manage the evidenced variability in the work situations, through the work schedules adaptation, reduction of muscular effort, and the organization and planning of tasks, specifically of appropriate ergonomics conditions. Knowledge management happens in the development of specific skills and abilities through the regulation of operative modes that integrate the characteristics of the means of production of the work environment, the real state of machines and equipment and the norms of the organization.
Desenvolvimentos de uma genealogia da governamentalidade : a noção de parresia entre a ética e a política
(Universidade Federal de São Carlos, 2017-08-11)
Santos, Alexandre Gomes dos
;
Silva, Franklin Leopoldo e
;
https://lattes.cnpq.br/4705628195902884
;
https://lattes.cnpq.br/3454160802382594
Our aim with the present research is a "genealogy of governmentality" based on the investigations undertaken by Michel Foucault in the last years of the Collège de France, when notions of "spirituality", "ascesis" and "parresía" are used to articulate politics and ethics around the government of self and others, tracing the development of the "self-arts," elements of a Greek and Roman ethos, for governing arts of self and others, this through the logical chain "relations of power / governmentality / government of self and others / relation of self to you ". In addition, to point out the ethical consequences that such genealogy brings to our present, especially regarding the theme "freedom" as a possible thematic field for which we are taken from the Foucaultian studies around the aesthetics of existence.