Browsing by Issue Date, starting with "2009-08-21"

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Estudo da influência dos aditivos manitol, EDTA e NTA no processo de eletrodeposição de zinco sobre aço 1010 e na morfologia dos eletrodepósitos
(Universidade Federal de São Carlos, 2009-08-21)
Carvalho, Marcos Fernandes de
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Carlos, Ivani Aparecida
;
https://lattes.cnpq.br/1666217445807782
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https://lattes.cnpq.br/0922916090536806
In this paper the effects of adding mannitol, EDTA or NTA to an alkaline deposition bath on the electrodeposition of zinc on to AISI 1010 steel substrate were evaluated. Voltammetric curves of 1010 steel in deposition bath with mannitol or EDTA additives showed similar profiles. However, for NTA it was different. These experiments indicated that the current density (j) of zinc electrodeposition increased due to hydrogen evolution reaction (HER) from H2O reduction occurring in parallel to this process. The voltammograms of 1010 steel substrate in deposition bath with and without mannitol or EDTA showed two regions c0 and c1, due to iron oxide reduction/HER/initial zinc bulk deposition and secondary zinc bulk deposition, respectively. These regions were called b0 and b1, as NTA was present in deposition bath. In the region c1, for deposition bath with and without mannitol or EDTA, the j was similar, suggesting that the area of zinc electrodeposit did not differ significantly, unlike the plating bath with NTA (region b1). From cyclic voltammograms with lowerlimit potential, can be seen that the initial zinc bulk deposition occurred at - 1.45 V in cathodic sweep to deposition bath with and without mannitol or EDTA and this potential was shifted 100 mV in the positive direction (- 1.35 V) in the presence of NTA. When the sweep was reversed at - 1.60 V all the deposition bath showed, in the anodic sweep, a zinc dissolution peak. The current efficiency (e) was always lower than 100%, due to HER occurring in parallel to the zinc electrodeposition. It was verified that in the presence of NTA additive, higher values of e (55.8%) was obtained and also, zinc electrodeposits were thicker (2.65 μm) for charge density (qd) 10.0 C cm-2. For qd = 2.0 C cm-2, irrespective the additives, the values of e and thickness () were comparable. The morphological studies of zinc electrodeposits showed that all the additives work as a brightener, since refining of the zinc grains. The EDX analysis showed that for qd = 2.0 C cm-2 the oxygen incorporation did not occur for 0.20 mol L- 1NTA or 0.20 mol L-1EDTA, but was below detection limit for the 0.20 mol L-1 mannitol. For qd = 10.0 C cm-2, it can be seen that as plating bath containing 0.20 mol L-1 EDTA the oxygen incorporation was hindered in the zinc electrodeposits.
Subsídios ao extrativismo de briófitas no município de Cananéia, SP
(Universidade Federal de São Carlos, 2009-08-21)
Rancura, Sheila Aparecida de Oliveira
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Nordi, Nivaldo
;
https://lattes.cnpq.br/8168865557947289
;
https://lattes.cnpq.br/7489765544523782
The management of non-timber forest products is an important alternative to forests maintenance. Nevertheless, the demand for some species at commercial scale may result in negative impacts to the local biodiversity. The bryophytes, particularly species of Sphagnum and Syrrhopodon genera, are among the vegetal resources exploited in restinga areas of Cananéia, in the south coast of São Paulo State, Brazil. After the organization of the harvesters in an association, the extraction is now legally carried out in licensed areas. The harvesting of bryophytes by the local population aims to supply the ornamental plants market, but there is a lack of studies to estimate the impact of the exploration providing information to the proper management of these resources. In order to provide subsidies for extraction and management of bryophytes Sphagnum and Syrrhopodon, this study raised information about the abundance and distribution of the explored bryophytes as well as the havesting practiced in Cananéia. To cover the different aspects involved in the harvesting of bryophytes, this study used Plant Ecology, Human Ecology and Ethnoecology approaches. Information concerning to the harvesters population and the harvesting activity were obtained through informal conversations, interviews and guided tours. Geoprocessing tools were used to characterize the bryophytes exploitation areas. The percentage ground cover by bryophytes was estimated applying the line-transect method and to evaluate the regeneration of Sphagnum plots were established and effected two harvests simulating traditional harvesting. The results indicated that explored bryophytes occur predominantly in Brejo de Restinga and Floresta Baixa de Restinga areas. Under similar conditions to those found in the experiment which simulated the traditional harvesting, the report demonstrated that six and seven months after harvest, Sphagnum presented height and yield like to the initial condition. In this sense, the harvesting, when done under the traditional way, tends to minimize the negative impacts of harvesting on the regeneration of bryophytes. Therefore, the relations determined in the commercialization process define the pressure upon exploited species and induces the harvesters to modify the traditional harvesting, resulting in an overexploitation of some places and a collect of very small bryophytes. Such actions contribute to a lower yield of the collect and may compromise the natural regeneration of some regions. The definition of management rules coupled to the bryophytes market rules built collectively constitute an essential point to established a less predatory harvesting.
Os trabalhadores da indústria de software: flexíveis e precários?
(Universidade Federal de São Carlos, 2009-08-21)
Oliveira, Daniela Ribeiro de
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Lima, Jacob Carlos
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https://lattes.cnpq.br/9244132532446607
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https://lattes.cnpq.br/3340719766336945
Considering the current labor crisis and the many forms that work have assumed precarious, informal, temporary or part-time -, our intention here is studying a set of workers whose rose as result of the development of information technology within the context of flexible capitalism: workers of software industry. The knowledge of information language is what defines the qualification and possibilities of these kind of workers within labor market, but in Brazilian case these kind of workers usually are submitted to atypical work contracts like work by project, part-time job, temporary job, outsourcing job and even kind of jobs protected by labor Brazilian laws. We semi-structured-interviews with eighteen workers whose continued employments were distributed of this way: six workers under Brazilian laws standard, five trainees, one free-lance, one Legal Entity Person , three entrepreneur partners and two public employees one public server and other a scholar. The research was done in São Carlos and Araraquara, cities located in the central region of São Paulo State. We to understand the workers point of view about the different types of labor contracts, to outline a profile of qualification these workers and their work trajectory and figure out the labor processes that they are submitted. In addition to interviews, we analyzed the content of specialized websites about Information Technology (IT) and software development, as well as available magazines and newspapers online and printed.
Compósitos de Polipirrol e Li1,05Mn2O4 : preparação por dip coating ou casting e caracterização eletroquímica
(Universidade Federal de São Carlos, 2009-08-21)
Brocenschi, Ricardo Francisco
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Biaggio, Sonia Regina
;
https://lattes.cnpq.br/0418215244233120
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https://lattes.cnpq.br/4530780432056175
Films of polypyrrole/Li1.05Mn2O4 composites were prepared by chemical synthesis over a carbon-fiber substrate, using the dipcoating and casting techniques, aiming at improving the performance of these materials as cathodes in secondary lithium or lithium-ion batteries. For this the following were investigated: i) electrochemical behavior of both materials (polymer and oxide) over the carbon-fiber surface; ii) electrochemical characteristics and stability of the composites obtained by the different methods; iii) best electrolyte to work at high potentials (> 4 V vs. Li/Li+); iv) electronic conduction of the composites; v) morphology of both components of the composites; vi) behavior of the composites as cathodes of lithium-ion batteries. From the obtained results it could be concluded that neither preparation technique led to films with a good electrical contact between the spinel crystals and the carbon fibers, which is necessary for them to show a high performance for charge storage. For the materials prepared by dip coating, the use of factorial design effectively helped in obtaining a higher specific-capacity value for polypyrrole (118 mA h g-1), but that was not the case for the polypyrrole/Li1.05Mn2O4 composite (only 20 mA h g-1). On the other hand, for the films prepared by casting, the electronic conduction of the spinel was increased due to the polypyrrole and carbon black mixture, while the most appropriate electrolyte for the electrochemical characterizations was 1 mol L-1 LiClO4 in EC:DMC 1:1 (V/V). However, only the predominantly capacitive behavior of the carbon fiber was observed in the charge/discharge tests. Finally, the charge/discharge tests of the polypyrrol/Li1.05Mn2O4 composite compacted over platinum yielded values of ~70 mA h g-1 for the first cycle and a better stability than that presented by the pure spinel.
Efeito de estímulos vibratórios aplicados na região plantar sobre o equilíbrio corporal de idosas
(Universidade Federal de São Carlos, 2009-08-21)
Wanderley, Fábio da Silva
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Rebelatto, José Rubens
;
https://lattes.cnpq.br/1684247449456330
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https://lattes.cnpq.br/3866913143880127
Objective: To determine the effect of vibration stimuli with 100 Hz frequency, applied to the plantar region, the body balance in women aged less than 60 years. Method: We selected 30 women aged less than 60 years with lack of static balance measured by the test support Unipodal with eyes open. The participants were randomly divided into an experimental group and a control group. All subjects were evaluated by four additional tests: the test Unipodal support with eyes closed, the Time Up and Go test, the Functional Reach test adapted, and Static Posturography evaluated using the force platform. A study was conducted blind, and the evaluators did not know to which group subjects were. The subjects in the experimental group received vibration therapy applied directly in the plant with 100 Hz frequency and oscillation of 2 mm. We performed 24 sessions of vibration stimuli, applied by the same physiotherapist. We analyzed the changes of the average number of individuals by two-way ANOVA with Tukey test as post-hoc to the data showing normal, and for not presenting normality test was used to Friedman. The comparison of the averages of the groups, experimental and control, was done using the one-way ANOVA for data presented normal and Kruskal-Wallis test for those who did not show normality. Results: We found significant differences between experimental and control groups in the third assessment of the Functional Reach test adapted in the speed of oscillation of the center of anterior-posterior pressure with the eyes open and closed and the area of Oscillation of the center of pressure with eyes closed. In examining the three evaluations of the intervention group was found to improve body balance in the Functional Reach test adapted in the speed of oscillation of the center of anterior-posterior pressure with the eyes open and closed and the area of Oscillation of the center of pressure with eyes closed. In the control group there was no statistically significant difference in any of the tests. Conclusion: The vibration stimuli applied to the plantar region, with 100 Hz frequency, showed beneficial effects on body balance in women over 60 years, being more effective in postural control of anteriorposterior axis and during the deprivation of vision.
Obtenção e condutividade elétrica de vitrocerâmica Li1+xAlxTi2-x(PO4)3 com diferentes microestruturas
(Universidade Federal de São Carlos, 2009-08-21)
Semanate, José Luis Narváez
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Rodrigues, Ana Candida Martins
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https://lattes.cnpq.br/4499231813051400
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https://lattes.cnpq.br/9824558997496023
Technological advances in portable devices imply not only the development of devices but also the need to enhance their power sources. For instance, cellular phones with high technology incorporating Bluetooth, Infrared, Digital Camera, Games, GPS, Internet Browsing, etc., need high performance rechargeable batteries. Lithium ion-conducting glass-ceramics with NASICONtype structure, based on the Li1+xMxM'2-x(PO4)3 system, where M = Al, Cr, Fe, Ga and M' = Ge, Ti, Hf, are considered good candidates as solid electrolytes in lithium ion batteries due to their chemical stability, easy fabrication and high ionic conductivity. In this work, the Li1+xAlxTi2-x(PO4)3 glass composition was synthesized by the traditional method known as Splat Cooling. Glass-ceramics with the same composition as the precursor glass but with different microstructures were obtained by controlled crystallization, using single and double heat treatments. The parent glass was characterized by chemical and thermal analysis and the latter enabled tailoring of the crystallization heat treatments. X-ray diffraction (XRD) results indicated that the resulting glassceramics exhibit the desired NASICON-type structure as primary phase, as well as the segregation of insulating phases, i.e., AlPO4 and/or TiO2, which do not affect the electrical properties. An examination of the microstructure by scanning electron microscopy (SEM) and measurements of electrical conductivity by impedance spectroscopy (IS), combined with the XRD analysis, indicated that the electrical conductivity of single heat-treated samples increases with the heat treatment temperature and hence with the increase in crystallinity. Samples synthesized by double heat treatment showed increasing electrical conductivity with decreasing nucleation treatment time and consequently with increasing average grain size.
Quando preferir um samba ao hino nacional é crime: integralismo, etnicidade e os crimes contra o estado e a ordem social (Espírito Santo 1934-1945)
(Universidade Federal de São Carlos, 2009-08-24)
Ackermann, Silvia Regina
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Monsma, Karl Martin
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https://lattes.cnpq.br/7465838222310384
This work focuses on the State of Espírito Santo in the 30 and 40 decades in the 20th century and aims to analyze the conflicts that took place in the meeting of two relevant events of this period: the repression to the Integralism and the consequences of the Second World War. It is important to stand out that the State of Espírito Santo, as well as other Brazilian States, had its history marked by European immigration in the 19th century. At that time the state received, mainly, Pomeranian/German and Italian immigrants. Part of these immigrants and descendants, in the decade of 30, acted in Brazilian Integralist Action (AIB), a right extreme party and influenced by European Nazi-fascism. Some conflicts that imbricated ethical issues and the acting of AIB, officially forbidden since the coup of the New State, became more visible and resulted in criminal proceedings. It was ascertained that AIB had strong presence in Espírito Santo, especially, in the regions of Pomeranian/German and Italian settlement. Also, it was verified that ethical conflicts did not seem to be so prominent as it was expected to. It seemed that the major conflicts were marked by a nationalistic feeling and confrontations that still had AIB as an explanation. It can also be suggested that differentiated cultural practices of the immigrants and descendants were not understood as so dangerous by the government since they were followed of economic and politic status, for instance, case of the South of Brazil. Originated criminal proceedings in the State of Espírito Santo, which were presented at the court of National Security (TSN), were used as privileged sources. Some paper was analyzed such as: documents and photographs apprehended by the Espírito Santo police from AIB nucleus, official letters from the Education and Justice department, newspaper and magazines, besides interviews with inhabitants of Domingos Martins city (ES). The historical event reported starts with AIB National Congress in Vitória (1934) and it closes up with the Second World War end (1945). Key words: Brazilian Integralist Action. Second World War. Immigrants. Criminal Proceedings. National Security Court.
Concepção semântica da verdade segundo Alfred Tarski
(Universidade Federal de São Carlos, 2009-08-24)
Pereira, Renato Machado
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Cass, Mark Julian Richter
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https://lattes.cnpq.br/6549114665097353
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https://lattes.cnpq.br/1751442161665645
The objective of this dissertation is analyze the problem of truth as presented by Alfred Tarski in his essay The Semantic Conception of Truth . Other theories of truth are considered, explained and classified in the first chapter. The second chapter attempts provide a general characterization of correspondence theories of truth. Tarski s essay is discussed in the third, and, finally, in the fourth chapter, the semantic and correspondence theories are compared, and the philosophical importance of the former is evaluated.
O governo Chávez e a luta pelo poder na Venezuela: uma análise dos atores políticos em conflito
(Universidade Federal de São Carlos, 2009-08-24)
Fukushima, Kátia Alves
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Braga, Maria do Socorro Sousa
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https://lattes.cnpq.br/2311094074614215
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https://lattes.cnpq.br/2886246718185707
The main objective of this study is to analyze the factors that explain the reactions of the opposition sectors to the government of Hugo Chávez between 2001 and 2004. The understanding of these reactions is searched having as background the break with the liberal democratic regime occurred in 1999, with the up rise of this president, inaugurating what it calls democracia participativa y protagónica . To achieve its objectives this work try to understand initially the political regime in the country since the construction of liberal democracy around the Pact of Punto Fijo, through its crisis during the 1980s, until the election of Chavez in 1998. Finally, we present some interpretations on the political and institutional changes occurred with the new government and what they may represent in the sectors linked to the former regime that arise in opposition. The findings indicate that the reactions of these sectors to the government initiated in 1999, resulted from its displacement from the power, and not as they stated in their dissatisfaction with the "authoritarianism" of the new regime. What they pursued was the control of the state, allowed by the minimalist nature of democracy pre-Chávez.
Influência do peso adicional nos chutes espontâneos de lactentes pré-termo tardios no 3º e 4º mês de idade
(Universidade Federal de São Carlos, 2009-08-24)
Dionisio, Jadiane
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Tudella, Eloisa
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https://lattes.cnpq.br/3207258034860219
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https://lattes.cnpq.br/1067940853843923
Uma abordagem para recuperação de informações sensível ao contexto usando retroalimentação implícita de relevância
(Universidade Federal de São Carlos, 2009-08-24)
Martins, Diogo Santana
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Santos, Marilde Terezinha Prado
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https://lattes.cnpq.br/9826026025118073
;
https://lattes.cnpq.br/9363905929371318
This dissertation reports an approach to enhance information retrieval systems which are accessed through mobile devices. This sort of devices can impose constraints on user-computer interaction, mainly concerning expression of contextualized queries and navigation of long lists of results. Our approach integrates user work context in implicit relevance feedback, which is developed over a Case Based Reasoning methodology, with the purpose of providing personalized information retrieval. To tackle these issues, it was developed an architecture to manage transformation and processing of context information, as well as selection of evidences to expand queries through implicit relevance feedback. The project was evaluated on two case studies and the obtained results show that our approach enhances the quality of information retrieval, even under varitions on the size of the document collection, on the diversity of users and on context situations.
Programa de capacitação de docentes para promover independência de crianças com baixa visão nas atividades de vida diária: PRÓ-AVD
(Universidade Federal de São Carlos, 2009-08-25)
Gebrael, Tatiana Luísa Reis
;
Martinez, Claudia Maria Simões
It is estimated that in Brazil one of 500 children have low vision. In this population, among all difficult possible, have the dependency in daily life activities (ADL), that influence at social integration, learning and school inclusion. Detached for the regular teacher s work inside the class with ADL´s children especially in preschool. The propose of this work was to develop, implement and evaluate one individual program of collaborative assessoring in Occupational Therapist for teacher training, to increase their repertoire of strategies and resources to promote the independence of preschool children with low vision in activities of daily hygiene and nutrition, called PRÓ-AVD . Study participants were 10 teachers and 10 students with low vision aged between 4 and 6 years of regular education children. The experimental design of the study consisting of 5 teachers and 5 students belonging to the Experimental Group who received the intervention in a first moment, and 5 teachers and 5 students to the control group that received no intervention. The elaborate of the training program involved the study of children's abilities in the tasks of self, and his visual capacity, the original repertoire of the teacher, and the dynamics of dyad Teacher - Student in carrying out AVDs. The implementation happened through collaborative assessoring, on 6 weekly meetings, consecutive, consisting of interactive dynamic between the researcher and teacher. Measures were taken pre-test and post-test and a field diary, analysis of film and questionnaires to assess qualitatively and quantitatively the effect of the intervention program in increasing the repertoire of teachers to promote the independence of their students in AVDs. The program showed efficient when applied, the results were increasing her preparation and teacher repertory to work with hygienic and alimentation activities of the student with low vision. It is believed that the use of methods and teaching approaches, practice activities, feedback and support of researcher presence than weekly meetings were crucial to the membership and participation of teachers, as well as to obtain the results.
Políticas públicas municipais de gestão ambiental-urbana: experiências institucionais na implementação de uma gestão plena em Santo André e Araraquara, SP
(Universidade Federal de São Carlos, 2009-08-25)
Novaretti, Diego Meleiro
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Falcoski, Luiz Antonio Nigro
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https://lattes.cnpq.br/3200660670856698
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https://lattes.cnpq.br/0979200782595300
The following work has as main purpose discuss the present public politics of urban environmental management by analyzing municipal models, practices and experiences, in search of an absolute management. Inside the thematic of environmental and urban institutional politics, dialoging with normative aspects, of planning and institutional management, this research seeks the understanding and the analysis of the urbanenvironmental management from the city councils of Araraquara and Santo André. The selection of these city counties parted from the observation that they are in a favorite position in comparison with other ones due to the operational, administrational and cultural circumstances respecting to the new demands from the National System of Environment. In parallel, this research will board the difficulties of these both city counties to attend the new establishes that are being placed to them since the redemocratization of the 80´s, with regard to the municipal urban-environmental management, as well as to the questions associated with the interface between the urban politics and the environmental politics.
As políticas educacionais do governo Lula: a agenda da Secretaria de Educação Continuada, Alfabetização e da Diversidade - SECAD do Ministério da Educação
(Universidade Federal de São Carlos, 2009-08-25)
Melo, Regina Conrado
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Braga, Maria do Socorro Sousa
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https://lattes.cnpq.br/2311094074614215
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https://lattes.cnpq.br/3803567027810253
The main purpose of this essay is to investigate the major factors that had influenced the creation of Secretaria de Educação Continuada, Alfabetização e da Diversidade (SECAD), one of the units of Ministério da Educação with special emphasis in the ideas. Regarding John Kingdom s theoretical framework we shall seek to identify how the ideas about inequality and diversity shared by the group that created the institution had contributed for the agenda setting of Lula s government.
Dispersão seletiva de argila montmorilonita em blendas poliméricas de PA6/ABS
(Universidade Federal de São Carlos, 2009-08-25)
Oliveira, Amanda Dantas de
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Pessan, Luiz Antonio
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https://lattes.cnpq.br/8276650236213537
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https://lattes.cnpq.br/0010723066123700
For some applications toughening of polyamide is important. This can be accomplished through the addition of an elastomeric phase to the polyamide matrix with the drawback of a reduction in the stiffness and strength of the material. Several studies lately have focused on the modification of polyamide matrix with the purpose of obtaining a balance between toughness and stiffness for these thermoplastics. In this work, to achieve a balance between stiffness and toughness, ternary nanocomposites based on blends of polyamide 6 (PA6) and acrylonitrile-butadiene-styrene (ABS) were prepared by the melt blending processes using the organoclay Cloisite® 30B (OMMT) and the styrene-maleic anhydride copolymer (SMA) as compatibilizer. Four blending sequences were used to prepare the selected systems and their mechanical properties studied through the Young s modulus and notched Izod impact properties. The addition of organoclay increases the Young s modulus of all ternary nanocomposites when compared to the blend and the PA6 matrix. This fact was attributed to preferential location of the clay in the PA6 matrix phase. The micrographs obtained by transmission electronic microscopy (TEM) indicate that the nanoclay shows an exfoliated structure and reside in the PA6 matrix phase, as well as in the interface between the phases. PA6/ABS/OMMT ternary nanocomposites with different content of nanoclay (1, 3 and 5%) were studied and it was observed that the particles size of ABS dispersed phase decrease with the increase of the OMMT content in the blend. This fact indicates that nanoclay can play an important role to prevent the coalescence in the ABS domains during the melt state processes. PA6/ABS ternary blends compatibilized with SMA were prepared by melt state process and it was observed that the mechanical properties and the morphology were influenced by the blending sequence of the components.
SB-Index : um índice espacial baseado em bitmap para data warehouse geográfico
(Universidade Federal de São Carlos, 2009-08-26)
Siqueira, Thiago Luís Lopes
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Ciferri, Ricardo Rodrigues
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https://lattes.cnpq.br/8382221522817502
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https://lattes.cnpq.br/4302523779194273
Geographic Data Warehouses (GDW) became one of the main technologies used in decision-making processes and spatial analysis since they provide the integration of Data Warehouses, On-Line Analytical Processing and Geographic Information Systems. As a result, a GDW enables spatial analyses together with agile and flexible multidimensional analytical queries over huge volumes of data. On the other hand, there is a challenge in a GDW concerning the query performance, which consists of retrieving data related to ad-hoc spatial query windows and avoiding the high cost of star-joins. Clearly, mechanisms to provide efficient query processing, as index structures, are essential. In this master s thesis, a novel index for GDW is introduced, namely the SB-index, which is based on the Bitmap Join Index and the Minimum Bounding Rectangle. The SB-index inherits the Bitmap Index legacy techniques and introduces them in GDW, as well as it enables support for predefined spatial attribute hierarchies. The SB-index validation was performed through experimental performance tests. Comparisons among the SB-index approach, the star-join aided by R-tree and the star-join aided by GiST indicated that the SB-index significantly improves the elapsed time in query processing from 76% up to 96% with regard to queries defined over the spatial predicates of intersection, enclosure and containment and applied to roll-up and drill-down operations. In addition, the impact of the increase in data volume on the performance was analyzed. The increase did not impair the performance of the SB-index, which highly improved the elapsed time in query processing. Moreover, in this master s thesis there is an experimental investigation on how does the spatial data redundancy affect query response time and storage requirements in a GDW? . Redundant and non-redundant GDW schemas were compared, concluding that redundancy is related to high performance losses. Then, aiming at improving query performance, the SB-index performance was evaluated on the redundant GDW schema. The results pointed out that SB-index significantly improves the elapsed time in query processing from 25% up to 99%. Finally, a specific enhancement of the SB-index was developed in order to deal with spatial data redundancy. With this enhancement, the minimum performance gain observed became 80%.
Uma arquitetura de Gateway com QoS para gerenciamento de tráfego de rede considerando restrições temporais das aplicações
(Universidade Federal de São Carlos, 2009-08-27)
Marcello, Juliano
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Trevelin, Luis Carlos
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https://lattes.cnpq.br/5082419783043736
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https://lattes.cnpq.br/8571611787891164
Applications with time restrictions are becoming common in our daily lives. These applications range from games to applications for controlling air traffic. Applications with time restrictions that use the Internet / Intranet as a mean of communication (e.g. streaming audio and video, VoIP and messaging PRC-RT), require that their packets be delivered before the end of its deadline. In these cases prioritize traffic from the packets generated by these applications in relation to the other packets is a way of trying to minimize the loss of deadlines. Thus this work presents an architecture of gateway with QoS and traffic forecasting that aims to focus on requests from time-restricted applications. Gateway classifies traffic based on the IEEE 802.1q standard, in six classes with different priorities and uses the Box-Jenkins mathematical model to predict the amount of traffic for each class of service and provide resources to meet the classes according to their priority.
Eletrodeposição de nanoestruturas de cobalto em alumina anódica porosa e sua caracterização magnética
(Universidade Federal de São Carlos, 2009-08-27)
Oliveira, Cristiane Pontes de
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Souza, Ernesto Chaves Pereira de
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https://lattes.cnpq.br/1505400360366643
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https://lattes.cnpq.br/3680344230876235
In this thesis, the results regarding the investigation about the cobalt electrodeposition in templates of porous anodic alumina are presented. The doctorade is divided in four main sections. The _rst one has consisted in exploring many experimental set up to the preparation of porous anodic alumina using galvanostatic mode. The main results are related to the high ordering achieved using the galvanostatic mode and the sistem versatility concerning preparation of new architectures in porous anodic alumina such as the two overlapped porous layers presented in this thesis. The second part is about the computational study of the metalic electrodeposition in porous templates. In this step a bidimensional model to the metal electrodeposition in porous sistem was developed and simulated. The model considers one potenciostatic pulse. Potential distribution inside the template is calculated using the Laplace equation. Difusion equation takes into account the transport of electroactive species. Simulations show clearly the interaction between the concentration gradient inside the pore and potential distribution in the oxide inner. This dynamic allows to understand the top deposition and is consistent with the catch up e_ect. Based on insights from early step, the cobalt electrodeposits in porous anodic alumina were prepared by galvanostatic and potentiostatic pulsed electrodeposition. Finaly, the fourth part of the work deal with the magnetic characterization of the cobalt electrodeposits. The electrodeposits prepared by galvanostatic pulsed electrodeposition presented the exchange bias behaviour. The exchange bias is result of the presence of antiferromagnetic cobalt oxide, which lead to the formation of ferromagnetic (Co)/antiferromagnetic (CoO) interfaces responsible by the increase in the coercive _eld when the sample is cooled at presence of high magnetic _eld (Field Cooling procedure - FC). In addition, it was observed a anomalous temperature dependence of coercive _eld. Regarding the electrodeposits prepared by potentiostatic pulsed electrodeposition, they showed similar temperature dependence of coercive _eld. The coercive _eld (HC1) increase as the temperature is reduced from 300 K, achieving a maximum around 100 K, and from this point, the coercive _eld decrease signi_cantly. According to the reversible magnetic susceptibility behaviour, this result is related to the magnetoelastic contribution to the sistem anisotropy.
Caracterização da incidência e evolução de pragas e doenças em agroecossistemas cafeeiros sob diferentes manejos
(Universidade Federal de São Carlos, 2009-08-27)
Lopes, Paulo Rogério
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Ferraz, José Maria Gusman
;
https://lattes.cnpq.br/3851804858390996
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https://lattes.cnpq.br/0354540389206559
This research aims to characterize the incidence and development of major pests and diseases of coffee in agroecosystems under conventional, organicmineral, organic and agroforestry managements in two municipalities in the southern Minas Gerais State: Machado and Poço Fundo. It was carried out monthly monitoring of the leaf-miner (Leucoptera coffeella), borer coffee (Hypothenemus hampei), rust (Hemileia vastatrix) and brown eye spot (Cercospora coffeicola) for a period of one year (december/2007 the november/2008) in crops of Novo Mundo variety with spacing (3.0 to 3.5 m X 1.0 to 1.2 m). The monitoring of leaf-miner and diseases of the coffee was done through the collection of ten sheets of the third or fourth pair in all sides of the coffee, and twenty plants sampled by agroecosystem, totaling two hundred leaves collected for evaluation of pests and diseases in each system. To monitorate the borer coffee it was selected 32 plants, six different points on each plant (10 fruits grouped by set point) and there was non-destructive evaluation. In all agroecosystems monitored, both managed by the family farm, the infestation of the borer coffee and leaf-miner did not reach level of economic damage in any evaluation. With respect to diseases evaluated, it was observed that the rust and brown eye spot reached the level of economic damage in all management systems. However, the organic-mineral systems, organic (monoculture) and agroforestry (organic) the occurrence of rust was critical to reach high levels in the months april to october of 2008, and the values above 60% of incidence in four months of evaluation. The incidence of brown eye spot was relatively lower in the conventional and organic (monoculture), whose peaks did not exceed 41% and 55%, consecutively. Already in the organicmineral and agroforestry (organic) the occurrence of Cercospora reached very high levels, reaching 76% and 67% respectively in July. Despite the high incidence of rust and brown eye spot found in coffee agroecosystems organicmineral and organic, the average productivity achieved by these systems in the past three years was higher than the conventional, even the latter system investing heavy in pesticides and chemical fertilizers.
Desempenho de sistema predial de água quente
(Universidade Federal de São Carlos, 2009-08-28)
Benedicto, Sergio Murilo de Oliveira
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Amorim, Simar Vieira de
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https://lattes.cnpq.br/8264867164852836
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https://lattes.cnpq.br/9576941397841580
In Hydraulic and Sanitary Building Systems there are nonconformance issues that can occur when user begins occupying and interacting with the building. Among other systems, the Hot Water Building System is responsible to offer to user important activities to human being such as bath and dish washing. The performance of the systems that constitute the housing buildings along its life is connected to the conditions of use for it was designed, to the execution of the construction according to the technical regulations, to the use of materials and components free of imperfections and to the programs and techniques of regular auditing and building maintenance. Even though the field of nonconformance is a subject not so explored in Brazil, it can be inferred as causes of nonconformance issues in the Hot Water Building System: technical regulations out-of-date, project mistakes, inadequate specifications, manufacture problems, execution errors, lack of maintenance or inadequate maintenance. This dissertation, based on the user's requirements as established by NBR 15575-1, objects the identification of performance requirements and criteria, to multistoried residential buildings. This theoretical study was applied to two multistoried residential buildings to find out probable s nonconformance.