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Desenvolvimentos mecânicos e computacionais de suporte às medidas com sensores termoelásticos
(Universidade Federal de São Carlos, 2011-08-30)
Reis, Alan Ribeiro dos
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Pessoa, José Dalton Cruz
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https://lattes.cnpq.br/4212703554284544
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https://lattes.cnpq.br/5771511854912563
The hydrostatic pressure inside the cell or simply cell turgor is an important component of texture in vegetables and is directly related to firmness. The decrease in cell turgor of plant organs is also an indicator of loss of tissue water. This effect can be perceived visually by wilting accompanied by a dry appearance with the loss of brightness and color of products, which influences consumer perceptions about its quality. Within this context has been crafted technique for measuring turgor with Thermoelastic Probe® (TP) based on the principle of measuring isovolumetric. After an extensive literature review found that the published studies on TP, presented further on control theory and modeling of physical phenomena involved in the measurement of turgor. However not bring practical results, containing automated measurements of cell turgor in plants. This study aimed to fill this gap. In this direction was made improving of the method to manufacturing the sensor and a new mechanical design for TP. The attainment of the sensors is given through the steps of stretching the capillary, making the tip, sanding, filling and sealing fluid sensor. The method for obtaining the proposed sensor showed minimal utilization rate of 27.0% representing an improvement of 540% over the figures provided by the available literature. Since the new mechanical design of TP significantly improved the alignment and relative positioning of the sensor, sample and image capture system. The process of exchange of sensor and positioning of the sample for measurement of turgor was also facilitated, resulting in an average time of 5 minutes to perform these tasks. This marked a breakthrough since the previous version, users reported that this task could take up to 60 minutes. Both activities related to the new mechanical design of the ST and the improvement of the methodology for obtaining sensor thermoelastic were preparatory to the development of automatic control of turgor measurement. The automation of the measurement process was performed after the implementation of a software to detect the position of the meniscus oil / cytoplasm based on the determination of the difference in contrast between the phases formed by the fluid sensor (oil ) and intracellular fluid. For automatic control of the position of the meniscus, was implemented a Proportional Integral type controller. The proposed values for the parameters of controller allowed the control of the selected position of the meniscus and automatic - x - determination of turgor pressure in cells of onion (Allium cepa L.). In an unprecedented manner, this paper makes the first successful experiment in automatic determination of cell turgor in plant organs with Termoelastic Probe.
Moodle e GeoGebra como apoio virtual ao ensino de trigonometria segundo a nova proposta curricular do estado de São Paulo
(Universidade Federal de São Carlos, 2011-08-30)
Aguiar, Anderson Luiz de
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Caetano, Paulo Antônio Silvani
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https://lattes.cnpq.br/0370219014539994
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https://lattes.cnpq.br/1808009755717486
This work is the development, implementation and evaluation of a Virtual Learning Environment to support teaching trigonometry Curriculum Proposal according to the State of São Paulo, with strong use of dynamic geometry viewers. That proposal, implemented since 2008 with the name São Paulo Faz Escola, brings a series of actions to improve of education in face of national assessments of São Paulo, and the international quality indicators established by the Ministry of Education. The teaching material from these actions required a recycling of the practice, focusing on learning skills and abilities. Within this overall picture we develop teaching sequences with the use of ICT (Information and Communication Technologies) to show the student as the protagonist of the construction of knowledge. The implementation of the environment occurred in the first grade of Public Hight School, Newton Prado, during the 4th school grade of 2010 and had part of its five weekly classes held in the computer lab. We believe that these results will undoubtedly contribute to the improvement and development of basic education, especially math.
PROUNI: trajetórias
(Universidade Federal de São Carlos, 2011-08-30)
Ferreira, Karin Terrell
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Silva Junior, João dos Reis
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https://lattes.cnpq.br/4383025493040249
Established in 2004 by the Federal Government and ruled by Ministry of Education as a public policy of educational inclusion, the Program Universidade para Todos (ProUni) aims to help the modification of the exculpatory reality of higher education in Brazil. By granting scholarships to low-income students - especially those from public schools in the country - the Program provides the entry of these young people in private higher institutions, previously registered, which in turn have tax benefits. Under this Program, a few years ago, the presence of social categories that were practically excluded from higher education raises questions that deserve reflection. Studying the story of these students during their initial training and trying to understand the changes in demands and in daily practices at school and labor market, as well as the profile of these students in contemporary society, represents a necessity for research and for the educational policies in Brazil. Through this new reality of Brazilian education, this work has the intention of investigate the factors that motivate students who enrolled in the Pedagogy course at an IES from Limeira/SP to seek the graduation at this kind of teaching, understanding the meaning of the education for them, as well as their expectations and aspirations related to the future and work. This analysis of the scholar and professional trajectories from the students is guided at a sociological perspective of Pierre Bourdieu and contributors.
Proposta de método para avaliação do processo de extração de sucos cítricos
(Universidade Federal de São Carlos, 2011-08-30)
Kharfan, Daniela
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Toledo, José Carlos de
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https://lattes.cnpq.br/9421627326330417
For almost one century, citrus chain has been one of the most important agribusiness for Brazil. Brazil is the largest world orange producer and the largest orange juice exporter, responsible for almost 90% of the worldwide orange juice exportations. Doubtless one of the most important Brazilian sectors, citrus is responsible for a huge percentage of the agribusiness exportations (around USD 1,5bilion/year) and one of the economy motors of the central regions of the State of São Paulo. Over this period, many changes occurred and are still going on into the national and international scenarios. Also, in the XXI century changes have being happened more quick and intense: great fruit and orange juice price oscillations, influence of exchange variation, the 2008 economical crisis, influence of climate conditions and incidence of new diseases, besides demand variations regarding volume and type of product (advent of NFC Not From Concentrate or single strength juice). Citrus processing industry represents a fundamental key role in the whole chain, to achieve new frontiers, putting the Brazilian product into the 5 continents, leveraging exportations to almost 1,300 k/tons of juice exported annually. To guarantee competitiveness in the business, processors have searched continuous improvement on processes, equipment, management techniques as well as quality standards of their products, in order to meet the demands of the market that, year by year, have become more discerning and demanding. There is also the need of continuous improvement and adjustment of the Research & Development techniques for equipment applied to industry, to attend the new parameters. Performance tests of citrus juice equipment are totally important to: evaluate productive process efficiency, investment definition, meet customer s standards and represent a point that impacts the strategic corporate decisions. The purpose of this master s degree dissertation is to propose a method for evaluating the technical-economic stage of citrus juice extraction. The study aims the juice extraction process introduced in the citrus juice extraction chain. For this, it was performed a review of literature and a case study in the segment of citrus juice processing. The research approach used is qualitative and quantitative, using already existent data, from empirical studies conducted in the sector. This work aims to structure and propose a method for the process of citrus juice comparative tests, and the performance evaluation of the extraction system, considering the higher number of variables and ensuring all necessary and sufficient data for decisionmaking. As academic contribution, this work aims to bring an empirical example improvement of food industry equipment, using experimental techniques and data analysis in a specific juice extraction situation, whose results are used for tracking their productive processes, monitoring and improving performance and decision-making regarding changes and investments.
Cerâmicas refratárias resinadas: fundamentos, análise crítica e efeito dos agentes grafitizantes e antioxidantes
(Universidade Federal de São Carlos, 2011-08-30)
Bitencourt, Celina Souza
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Pandolfelli, Victor Carlos
;
https://lattes.cnpq.br/7369376873984839
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https://lattes.cnpq.br/4462982843508209
Improvements on carbon containing refractories are synonymous of benefits for the entire steel industry. In the last years, two particular developments deserve to be highlighted: (i) the report of additives able to graphitize the carbon fixed by the thermoset polymers used as refractory binders and (ii) the induction, by combining antioxidants, of in situ growth special whiskers. Whereas the graphitization would reduce the disadvantages that thermosetting resins present when compared to other organic binders, the whiskers would be able to afford significant improvements concerning mechanical and chemical resistances. However, the fundamentals at which these innovations are based on left some unanswered questions. Therefore, the main purpose of this project was to reproduce and analyze these technologies in order to fill such gaps, by evaluating MgO-C model compositions via XRD, SEM and thermogravimetry. The attained results shown that both technologies appreciably modified the phases developed in these model compositions. However, regarding the graphitizing agents, such changes did not lead to benefits related to the carbon oxidation resistance, and the literature results concerning special whiskers were not fully reproduced. It was also observed that the model compositions approach presents some weak links and their use to forecast the refractory microstructure would not be recommended. Nevertheless, based on the experiments carried out, an enormous diversity of whiskers were attained which could also been formed in the refractories. This latter issue motivates further analysis in order to evaluate the consequences of such structures in the thermo-mechanical properties. Additionally, aiming to understand the carbon containing refractories and to identify other routes less explored to improve them, this project also reviews and critically analyses the literature in the area and in the correlated ones, such as those on carbon and polymers fields.
Uso do balanced scorecard para mensurar o capital humano : estudo de caso múltiplo
(Universidade Federal de São Carlos, 2011-08-30)
Rodrigues, Elaine
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Martins, Roberto Antonio
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https://lattes.cnpq.br/3518820028045730
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https://lattes.cnpq.br/4871292862269352
The Balanced Scorecard (BSC) is based principally the implementation of the strategy into four perspectives: financial, customer, internal processes and learning and growth. Strategy execution suffers the direct influence of the people who develop and therefore no need for the management of people take a new approach to the implementation of the BSC. According to some authors, you can enter in BSC implementation of the strategic management of people, considering the scorecards of human capital in order to permanently evaluate the efficiency of the implementation of global strategy and strategic objectives of the success and effectiveness of the force work in relation to the results achieved by keeping some factors that directly influence that success, as the understanding of organizational culture, development of skills and behaviors. This dissertation aims to investigate how the BSC can be used to measure human capital (HC), performing a comparative analysis between literature and practice of both companies. The research method used was a multiple case study of two companies that have implemented the BSC indicators incorporating some of the CH. The research identified that companies have studied the BSC tailored to your needs for a "strategic planning" that begins with the SWOT analysis. They have overall strategy and departmental strategic objectives, targets and action plan for each business unit. The definition of performance indicators of the Human Resources department is based on research of weather and from this the internal actions are directed to be made that ultimately reflect directly in the implementation of actions related to such indicators. Across these companies use the BSC alone does not allow the measurement of human capital is necessary for managers to set strategic indicators aligned with the company's overall strategy in line with human performance necessary to implement such strategies.
Considerações sobre autenticidade e direitos autorais em materiais didáticos para ensino-aprendizagem de língua inglesa nas modalidades presencial e a distância
(Universidade Federal de São Carlos, 2011-08-30)
Rossetti, Gabriela
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Augusto-Navarro, Eliane Hercules
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https://lattes.cnpq.br/5716027350340906
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https://lattes.cnpq.br/9098277306915682
The diversity of educational contexts presented by face-to-face and distance education enables English teachers not only to choose and adopt didactic materials that are available for purchase, but also to evaluate and adapt an existing material or even produce their own teaching materials. Having such context in mind, this study brings an analysis and presents considerations about the question of authenticity in the production of didactic materials for face-to-face and distance teaching and learning processes, and the relation between authenticity and teaching materials with copyright issues.
Proposta de indicadores de desempenho de processo e qualidade para unidades produtoras de biodiesel do norte do estado de Mato Grosso
(Universidade Federal de São Carlos, 2011-08-31)
Rodrigues, Sergio Guaraci Prado
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Toledo, José Carlos de
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https://lattes.cnpq.br/9421627326330417
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https://lattes.cnpq.br/4946351112537467
Corporate management has been a major challenge due to the changes of behavior of society as a whole. Much has been discussed in relation to meeting the needs and expectations of customers, models are developed (BSC, Sink and Tuttle, Performance Prism among others) in order to integrate the internal and external perspectives and approaches to organizations in order to facilitate understanding and measurement of an increasingly selective market and increasingly agile changes. Among these concerns is the issue of greenhouse gas emissions, the impact of ozone mainly by the use of fossil fuels (petroleum), besides the risk of its scarcity. Thus, research has been conducted in the area of renewable biofuels, such as ethanol, biodiesel, and other bioenergy sources. In these studies, has been shown to be economically viable, but mostly, the feasibility from the viewpoint of decreasing the rate of air pollution, greenhouse gas emissions by the use of biodiesel added to diesel used for transport. Because the biodiesel production process still developing industries with processes still under implementation, early production and / or stage of process improvement, usually with initial concern in technical procedures, variables of financial order, the early production, the soon return of investment, achieving the goals established in the strategic planning, among others, let aside a major issue: the measurement and evaluation of process performance in terms of quality and productivity. In this respect, the need arises for indicators measuring the performance of processes and products of unit producing biodiesel. Thus this dissertation discusses methods, tools and indicators of process performance, with an emphasis on quality and productivity, from the "needs" of the internal users of the company, as well as existing legal requirements. The study of multihulls, with interviews and observations "in situ" with three units producing biodiesel from the northern region of the state of Mato Grosso, supported by semi-structured questionnaire was used as the research method. From tabulation, analysis and compilation of data, have been proposed measurement indicators appropriate to the reality and needs of managers performance.
Estudo de parâmetros cinéticos do sistema comercial Bac-to-Bac® para produção de proteínas recombinantes
(Universidade Federal de São Carlos, 2011-08-31)
Corrêa, Thaís Portantiolo
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Mendonça, Ronaldo Zucatelli
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https://lattes.cnpq.br/0886073943430823
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https://lattes.cnpq.br/9123699930520301
The expression system of recombinant proteins in insect cells/baculovirus (BEVS) was described and introduced in 1983 and since then has become a powerful tool for the production of recombinant proteins of biotechnological interest. This work studied the kinetics of Bac-to-BacR Baculovirus Expression System (Invitrogen ) used for the production of recombinant proteins, evaluating growth patterns and consumption of nutrients from Sf-9 insect cells infected with this commercial bacmid and determining the effect of viral inoculum. For this, Sf-9 cells grew at 29oC in T flasks containing 5 mL of SF-900 II medium or Schott bottles with working volume of 15 mL and orbital shaking at 90 rpm. UFLAG-286 cells were also tested at 29°C in TC-100 medium supplemented with 10% bovine fetal serum. The baculovirus used were the Autographa californica nuclear polyhedrosis virus (AcMNPV) as a wild baculovirus infection model, the bacmid extracted from DH10Bac bacteria and transposed with the transfer vector empty (pFastBac 1), called Bac sprec and the bacmid recombinant AcNPV with the GUS coding sequence of the gene β- glucuronidase, used as a standard for transposition experiments and transfection. Cells were infected at different times (TOI), on the initial phase, the exponential phase or stationary phase of cell growth, and with different multiplicities of infection (MOI) (0.01, 0.1, 1 and 10). It was observed that the MOI does not influence the viral replication, because even with the low MOI the cell growth was completely inhibited. TOI had already affected the production of total cell proteins, and infection in the early exponential phase was that obtained the highest number of total proteins. The supplementation of the cultivation with Bac sprec with serine and glutamine did not lead to increased viral production. The supernatant of cultures infected with Bac sprec was able to inhibit cell death where there was induction of apoptosis by terbutyl, indicating contain some protein with anti-apoptotic activity. This effect was not observed on wild baculovirus.
Desenvolvimento local com economia solidária: aspectos relativos à atuação de atores envolvidos
(Universidade Federal de São Carlos, 2011-08-31)
Amado, Rafaela Fernandes
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Silva, Ricardo Siloto da
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https://lattes.cnpq.br/5346985934880710
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https://lattes.cnpq.br/6134058510884250
Poder e resistência em Michel Foucault: uma genealogia do acontecimento
(Universidade Federal de São Carlos, 2011-08-31)
Temple, Giovana Carmo
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Fonseca, Thelma Silveira da Mota Lessa da
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https://lattes.cnpq.br/7055557169644792
Cette étude a pour objet fondamental analysé la relation entre la résistance et l exercice du pouvoir d après les études de Michel Foucault. Pour ce fair, nous allons développer cette sujet à partir d une généalogie de l`événement dans lequel nous pouvons analysé les écrits de Foucault en travers la notion stoïcien d événement et de la notion nietzschéenne de généalogie.
O processo de constituição da cadeia do biodiesel no estado de Mato Grosso
(Universidade Federal de São Carlos, 2011-08-31)
Ferreira, Geraldo Alves
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Paulillo, Luiz Fernando de Oriani e
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https://lattes.cnpq.br/9919942357089937
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https://lattes.cnpq.br/1463889626426485
The search for renewable energy sources, clean, puts the state of Mato Grosso in the forefront when it comes to biodiesel production, the institutional environmentcreated from the 70's with the modernization of agriculture in the state, facilitated the development Agroindustrial Complex of Soy - CAIS and consequently the biofuel industry that has great relevance to the state's economy. Thus, this paperaims to show the main process of establishing the chain of biodiesel in the state ofMato Grosso on the assumption that the chain of biodiesel is developed with high interdependence of the agroindustrial complex of soy in Mato Grosso. To collectthe data we used a structured questionnaire and semi structured, the researcher presents the guidelines, but also gave the respondent the option of mentioning other points considered relevant and which were not addressed. The questionnaires were administered personally by the author and some others, sente-mails requesting information for institutional aid in the understanding of the relationships of the actors present in this chain. The results indicate the existence of a strong link in the chain of biodiesel with soybean agro-industrial complex in the state and that the production of alternative raw materials for the replacement of soybeans in the biodiesel production chain, is still in its infancy, there is noproduction sufficient scale to offer a competitive with soybeans.
Rotinas de revisão no processo de geração e adoção de tecnologias na cafeicultura: estudos de casos
(Universidade Federal de São Carlos, 2011-08-31)
Bicalho, Ellenise Elsa Emídio
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Nantes, José Flávio Diniz
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https://lattes.cnpq.br/1900976112613026
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https://lattes.cnpq.br/4244515570556074
The project‟s object was to identify how the generation, diffusion and adoption process of agriculture machinery and equipments occur in the coffee production. In order to achieve this goal, a qualitative approach was chosen through a case study. The sector companies and coffee cooperative members were analyzed. The results showed that the technology innovation and generation process is accomplished, mainly by the company itself and through partnership with suppliers and clients. Research institutes, competitors or other institutions did not participated in the innovation and generation process. The main reason for innovative activity accomplished by the studied companies is the high level of competition in the sector. Another factor considered important was the accomplishment of the consumer‟s necessities and wishes. It was observed that the best way of innovation diffusion take place in the participation of events and fairs. The client‟s properties products testing is another way used in the innovation diffusion. By the farmer‟s side, the diffusion takes place through the direct and personal information trade. Among the coffee growers studied, the technology diffusion takes place, many times, by the cooperative, through conferences offered to them. The adoption process meets several challenges to be overdone, but two factors can be outstanding: The labor cost and sales coffee price. These two factors are crucial for the grower makingdecision.
Sistemas agroflorestais e a construção do conhecimento agroecológico em assentamentos rurais
(Universidade Federal de São Carlos, 2011-08-31)
Nobre, Henderson Gonçalves
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Schlindwein, Marcelo Nivert
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https://lattes.cnpq.br/9690898537150950
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https://lattes.cnpq.br/0039137780834982
The Sepé Tiaraju, the first one settlement in the mode of Sustainable Development Project PDS of São Paulo state, founded in 2004 in the sugarcane region of Ribeirão Preto/SP, has as a proposal being an alternative to the conventional forms of land occupation and management of natural resources adopted in the region. Then a group of farmers along with Embrapa Environment, INCRA/SP and other partners has been trying to consolidate a participative strategy of development and generation of agro-ecological knowledge in the settlement using Agroforestry SAFs. Based on this ongoing process in the Sepe Tiaraju settlement, this study uses methodologies such as Participatory Rural Appraisal, Participatory Action Research and Participant Observation to analyze the strategies of development adopted, and the contribution of the SAFs for the construction of agro-ecological knowledge and the consolidation of sustainable production systems. In summary we can say by this study that the Agroecology and the use of participative methodologies are essential to conduct local development strategies, thereby promoting the construction, validation and appropriation of knowledge by farmers. It also became clear the contribution of the agroforestry to conciliate the environmental conservation with the diversified food production for the families selfconsumption and even surplus for commercialization and income generation.
Relação entre línguas: diferentes modos de dizer o português brasileiro
(Universidade Federal de São Carlos, 2011-08-31)
Silva, Adriana da
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Silva, Soeli Maria Schreiber da
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https://lattes.cnpq.br/8794598988783452
Our work intitled Languages relationship: Brasilian Portuguese, several ways is based on the theory of the Semântica do Acontecimento(Semantics of the Events). Our corpus is formed by interviews maked by students linguistic graduate at the Federal University of São Carlos city , in 2009, during the Linguistic course taught by Prof. Dra. Soeli Maria Schreiber da Silva. In this research, we propose to study the functioning of the Portuguese language, so with the imaginary one language . Our objective was to observe it as the Portuguese -speaking establish a relationship with the colonization story at the utterance time. About our analysis, we observe speakers affected by the symbolic subjects that are located one at a time and place. In this sense, subjects are constituted in the Event enunciation, it is that we analyzed their positions, places that speak and the way they talk, how they speak and how their mean words. Thus the goal of this work is the language relationship where we consider, based on this theoretical foundation, that the senses are formed in the enunciative events, connected to the history, to the social as well as to the politics.
Estratégias, condições e obstáculos para implantação de técnicas mais sustentáveis no manejo da água em assentamentos rurais. Caso: assentamento rural Horto Vergel 12 de outubro , Mogi Mirim-SP
(Universidade Federal de São Carlos, 2011-08-31)
Barboza, Renato Matos de Lopes Torres
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Teixeira, Bernardo Arantes do Nascimento
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https://lattes.cnpq.br/1166854416745527
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https://lattes.cnpq.br/2156186273034545
When we analyze the basic needs of human beings, the quantity and quality of available water determines the life quality of a family or community. This research brings to light the importance of access to water to ensure the basic needs of rural communities based on social inclusion and self-sufficiency. A unique case study, based on Martin (2008), was proposed to study water management in the Rural Settlement Horto Vergel in Mogi Mirim-SP. The proposal aims to bring up the strategies and analyze the conditions and obstacles to implement more sustainable techniques in water management in rural settlements. A diagnosis of the settlement was developed based on a survey of existing documents, interviews with settlers, leaders, agents and Technical Assistance and Rural Extension (Ater) institutions working on site, as well as practical activities for implementation and evaluation of participatory methodologies developed during the research. It was found that sustainability in management and conservation of water in the settlement is directly linked to its historical development (camping, entering the lot, opening the water hole wells, installation of the power grid, semi artesian wells, opening of wells, installation of network distribution system, and creation of the rural district), forms of public investment and organizational models used. The institutions of Ater should systematize the adapted technologies for family agriculture already charted and/or tested related to water management and conservation, and develop instruments that will ensure the continuity and transfer of information between entities and teams. The existence of structural and organizational problems within the settlement, in addition to insufficient financial resources, lack of alternative methods and technologies, and research on water management and conservation by the Ater specialists, have interfered and still complicate the development process of the settlement.
O processo de planejamento da produção utilizando conceitos orçamentários para fins de avaliação de desempenho operacional numa empresa fabricante de bens de capital
(Universidade Federal de São Carlos, 2011-08-31)
Pedrino, Cintia
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Politano, Paulo Rogério
The fast growth of business and the new needs of the globalized market require companies to maximize their results, which are measured by the economic and financial market, throughout performance indicators of business activities. To do so, an organization goes, necessarily, through stages of planning and budget control where every sector shows its contribution. The planning process of the companies is divided into strategic planning, tactical planning and operational planning whose focus is to produce products and services efficiently in order to implement the overall goals and strategies of the company. The integration between the sectors as well as the quality of information becomes vital to make a good plan. For this, the use of systems and information technologies supporting the planning may have an important aspect in the search of competitiveness. The purpose of this work is to use the methodology of Action-research to systematize and automate, throughout a management information system, the production planning based on monetary values, distribution and allocation of the production cost, and to promote a maximization of the results.
Ao sabor das águas acreanas. Etnografia das oficinas de vídeo do projeto Vídeo nas aldeias: Ashaninka e Huni Kuin
(Universidade Federal de São Carlos, 2011-08-31)
Busso, Adriana Fernanda
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Cohn, Clarice
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https://lattes.cnpq.br/1714080901123094
;
https://lattes.cnpq.br/3430193753255761
This ethnography presents two moments of learning processes by which latter indigenous filmmakers members of the Pontão de Cultura Vídeo Nas Aldeias experience during their training: Shooting and Editing. The research took place from two field works: following the Indigenous Ashaninka Filmmakers Training Workshop of Amônia river in Acre, which resulted in the movie called UMA ALDEIA CHAMADA APIWTXA and the edition process of the Huni Kuin movie called KENE YUXI, AS VOLTAS DO KENE , in Olinda (PE).
O ensino de análise combinatória no ensino médio por meio de atividades orientadoras em uma escola estadual do interior paulista
(Universidade Federal de São Carlos, 2011-09-01)
Vazquez, Cristiane Maria Roque
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Malagutti, Pedro Luiz Aparecido
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https://lattes.cnpq.br/5462523657624050
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https://lattes.cnpq.br/7759375964594345
This paper has the aim to describe the design, development and application of guiding teaching activities in an area that is usually little explored, the Combinatorics. The study was developed through an intervention that consisted of three activities applied to guiding students in four classes of second grade high school of a state school in São Paulo. The activities were designed with the goal of putting students in a position of action and decision making to facilitate the understanding and the process of knowledge construction and were developed in groups of four or five students. The research classified as naturalist, by the fact that data collection was carried out directly on the site where the problem, is the central issue is to verify whether the teaching of Combinatorics, without the excessive use of formulas, through tutoring activities and use of multiplicative principle, can improve the teaching and understanding of that content. The results were obtained by analyzing the activities addressed by the students who were recorded, by observation, by notes taken by the researchers and also by the evaluation at the end of the research. It was found that the activities were essential for guiding a better performance of students who felt more secure and confident to carry out new activities. These activities represent the final product of this work and it is expected that constitute reference material for teachers who tirelessly seek for new methodologies.
Comportamento multicrítico no modelo de Heisenberg frustrado: transições de fases clássica e quântica
(Universidade Federal de São Carlos, 2011-09-01)
Nunes, Wagner Antonio da Silva
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Souza, José Ricardo de
;
https://lattes.cnpq.br/0253265789709463
In this work we study the critical behavior of systems described by the Anysotropic- Heisenberg model of spin 1/2 with competitive interactions (J1-J2 Model) on planes, and interplane nearest-neighbor interactions. We applied Effective-Field techniques for finite clusters with two (EFT2) and four (EFT4) central sites, as well as Linear Spin-Waves Theory (LSWT). We define α=J2/J1, as the frustration parameter, which together with the the anysotropy exchange and the spatial one lambda, we obtain the respective phase diagrams. Classic phase transitions are studied at finite temperatures, as well as the quantum ones at T=0. We observed the presence of two ferromagnetic (antiferromagnetic) states, a quantum paramagnetic, colinear ferromagnetic (CF) and antiferromagnetic (CAF) at T=0 for J1 < 0 and J1 > 0. We characterized the type of transition (continuous or discontinuous) existing in them. For T > 0, the same phases are found, with the exception of the quantum and the normal paramagnetic ones. The CAF a CF states are characterized in three dimensions in the following way: spin lines with the same orientation adjacent to lines in the opposite sense, and spin planes with the same orientation adjacent to spin planes with opposite sense. In the two dimensions these two states are equivalent. We analyze the classical and quantum limits of the model through the phase destruction of PQ in the ferromagnetic and antiferromagnetic case under the influence of anisotropies. We also applied to the frustated model in the plane and the λ interaction between planes the Theory of Linear Spin Waves and compared their results with those found for the Effective Field Theory.