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Modelos de spins geometricamente frustrados: transição de fase e estruturas de platores
(Universidade Federal de São Carlos, 2013-04-08)
Litaiff, Fabian Cardoso
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Souza, José Ricardo de
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https://lattes.cnpq.br/9589155356379692
This thesis presents a study of the magnetization plateau and the phenomenon of geometrical frustration in spin systems applied to lattices with triangular structure, as well as the results achieved by applying the differential operator technique of the Ising and Heisenberg models with external magnetic field applied to the easy magnetization axis z, their phase diagrams, behavior plateaus observed and analyzed according to the Haldane conjecture and appearance of plateaus presented by Oshikawa, Yamanaka and Affleck, and also to study the behavior of the magnetic susceptibility in order to verify the behavior of frustrated systems using the frustration factor f= θWC/TN to verify frustration encountered at various stages of the study models
Modelos para dados de sobrevivência na presença de diferentes esquemas de ativação baseados na distribuição geométrica
(Universidade Federal de São Carlos, 2013-04-08)
Roman, Mari
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Louzada Neto, Francisco
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https://lattes.cnpq.br/0994050156415890
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https://lattes.cnpq.br/8909524777106942
In this thesis new families of survival distributions are proposed. Those distributions are derived by assuming a latent activation structure to explain the occurrence of the event of interest. In general, the competitive causes may have different activation mechanisms. Here we assume three different ones, namely, fisrt, random and last actvation mechanisms. The presence of cure fraction are also addressed in two contexts. The models assumed that the number of causes follows a Geometric distribution and the lifetime for these causes follows an Exponential distribution, and a Gamma Generalized distribution. The properties of the proposed distributions are discussed, including a formal proof of its probability density function and explicit algebraic formulas for its reliability and failure rate functions, moments, order statistics and modal value. Inferetial procedure is based on frequentist and Bayesian perspectives. Moreover, Bayesian case influence diagnostics based in -divergence, with include Kulback Leibler divergence measure as a particular case, are developed. Simulation studies are performed and experimental results are illustrated based in real datasets.
Memória e resistência: os professores no contexto da ditadura civil-militar (1964-1985)
(Universidade Federal de São Carlos, 2013-04-08)
Hebling, Milene Cristina
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Hayashi, Carlos Roberto Massao
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https://lattes.cnpq.br/9136586124586219
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https://lattes.cnpq.br/7732231703263626
This is a study about the resistance of teachers of first and second degree to brazilian military regime. We try to identify which resistance practices were developed by these teachers and understand if they were organized in the individual sphere, as isolated actions of some teachers, or collectively, as an organization of professional category. Beyond that, we are also interested in investigating if this resistance had used the teacher profession as a support, being performed through pedagogical practices, or if it occurred outside the school environment, not presenting a relation, therefore, with the teaching activity. To treat our research object, we used two methodological strategies, which are oral history and documental research. For the realization of oral history, were previously selected eleven teachers who had lectured in primary or secondary school during the civil-military dictatorship. Of this total, six were located and four agreed to participated of the research. We conducted semi-structured interviews, using a predefined questionnaire as a guide, in order to know memories of the participants about the researched topic. The documental research was realized in the collection of the Departamento Estadual de Ordem Política e Social (DEOPS/SP), in order to find documents produced by this politics police organ about the studied teachers. We attribute great relevance to the oral sources obtained, due the possibility they represent of understanding our object of study from the point of view of the involved, i.e., the teachers. This research did not seek to be generalizing, since we do not work with samples, but with specific cases. In the analysis of collected sources, were constructed thematic axes which address different resistance practices developed by the focused teachers and the repression suffered by their actions. These axes are: "Presentation of teachers"; "resistance through the profession: possibilities and limits"; "resistance out of school" and "repression." As result, it can be seen that the participants built, through various practices, resistance to the military regime. Moreover, the opposition performed by these teachers was bounded by the characteristics of the opposition movement of society in general, i.e., the resistance developed by them was integrated into the social and political context in which the country was in each period of civil-military dictatorship.
A gerência nas Unidades de Saúde da Família: o olhar dos profissionais
(Universidade Federal de São Carlos, 2013-04-08)
Mendes, Juliana Delalibera Thobias
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Padilha, Roberto de Queiroz
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https://lattes.cnpq.br/2262980850254605
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https://lattes.cnpq.br/5964651998638948
This study aims to investigate the organization of the management process in the Family Health Units (FHU) in São Carlos, São Paulo, in the perspective of physicians, nurses and dentists of five Family Health Group (FHG). The study type was exploratory with a qualitative character. It was based on the interview form designated as subject-centered, which is based on the possibility of exploration of issues defined in advance by the researcher of the project. The study is based on reports about the management process experienced by these professionals taking as analytical categories: the Labour Process, the Care Process and the Continuous Education Process. In order to analyse the data, the Content Analysis based on the thematic modality proposed by Bardin (1977) was considered. It was verified that the management was recognized by professionals as an important tool for the consummation of the practices of FHU in the municipality studied, however, it was little developed and its effective implementation has shown itself as a great challenge to the responsible managers. It was identified, in the studied FHU, a management style highly centered on the nursing professionals, what makes necessary a change on the way through the professionaIs of the FHG see their managerial practices and that professionals responsible by the management be stimulated to think in methodologies, knowledge and practices capable of make the management currently employed closer to that proposed by the FHT.
Atenção à saúde de pessoas vivendo com o diabetes mellitus tipo 2 em uma Unidade de Saúde da Família
(Universidade Federal de São Carlos, 2013-04-09)
Neiva, Caroline Fernandes Diniz
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Feliciano, Adriana Barbieri
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https://lattes.cnpq.br/9398810638733882
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https://lattes.cnpq.br/8300813529343885
This is an epidemiological study, the type or cross sectional. Objectives: To describe the profile of individuals with type 2 DM according to sociodemographic variables, disease history, lifestyle habits, morbidity, access to health services, to identify the types of drug treatment in place to care for the disease; describe adherence to medication in people with type 2 diabetes; describe the profile of care offered at the clinic for patients with type 2 DM. The study population comprised the universe of 102 patients with type 2 DM, enrolled in a USF in São Carlos, SP. Three instruments were used for data collection, one being the instrument to measure treatment adherence - MAT. The first stage of information gathering were the records of patients with type 2 DM and the second included interviews with users suffering from type 2 diabetes. The results showed that the study population was predominantly female (63%), and the age group 71-91 years (28.9%), most (47.8%) had education between 1 to 5 years of study and (54.4%) are retired. The majority (52.3%) found the DM within 5 years, (84.4%) diagnosed in the clinic. Regarding the habit of living 72% do not exercise and exhibit more significant comorbidities as hypertension and dyslipidemia. With regard to health status, 70% of women considered it fair / bad. Most participants (86.7%) use medications to control type 2 diabetes. Regarding the use of medications, most (64.5%) ingests up to four medications daily, and the therapeutic class of antidiabetic Biguanides most used (36.7%) and 21.1% use insulin. Regarding medications for comorbidities 35.5% use only antihypertensives. Regarding the description of adherence to treatment 64.1% had adherence to medication. Found higher frequency of diabetes in medical consultations (85%) compared to the consultation with the nurse (50%), 17.4% of subjects were in multidisciplinary care, and 31.4% were referred to a specialist. There are records of dental care in 16.3% of records. As to laboratory median total cholesterol (mg / dl) in women are higher (near 200), as the value of HDL-C in males there is a higher percentage of individuals (50%) with a median below 45 mg / dl, the average value of LDL-C (mg / dl) is closest to 100 mg / dL in male patients, the median TG (mg / dL) in both sexes showed values above 150 mg / dl, fasting glucose in female median value closer to 100 mg / dl, values Hb1Ac showed poor glycemic control. There are records of diabetic foot evaluation in 24.4% of records. We conclude that there is need for ongoing training of health professionals that are part of the Family Health Teams in order to achieve greater implementation of education programs in diabetes and clinical protocols intensify strategies to improve adherence to drug treatment, and control metabolic health monitoring.
Soldagem por fricção e mistura (FSW) no aço inoxidável austenítico AISI 304
(Universidade Federal de São Carlos, 2013-04-09)
Plaine, Athos Henrique
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Alcântara, Nelson Guedes de
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https://lattes.cnpq.br/3123107570992184
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https://lattes.cnpq.br/8992899102845408
Stainless steels are an important class of engineering materials with attractive properties such as high mechanical and corrosion resistance and thereby widely used in a variety of industries and environments due to its outstanding properties such as mechanical and corrosion resistance. These materials, which are usually considered difficult to weld by conventional fusion welding processes, have demonstrated outstanding performance when joined by Friction Stir Welding (FSW), a solid-state joining process. FSW input energy regulates the magnitude of the thermal cycle and the intensity of deformation during the process, and it can be controlled by the welding parameters, which affects the grain features and consequently the mechanical properties of the joints. The aim of this work is to evaluate the feasibility of producing friction stir welds of a 304 austenitic stainless steel and correlate this process to the microstructures and mechanical properties in these joints. The samples were produced using a polycrystalline cubic boron nitrides (PCBN) tool and four different rotational speeds. Microstructural investigation showed that all joints presented, besides the base material (BM), the three typical FSW zones: stir zone (SZ), termomecanically affected zone (TMAZ) and heat affected zone (HAZ). The ZTA exhibited a microstructure similar to MB, while ZTMA and ZM were characterized by dynamic recovery and recrystallization, respectively. In the advancing side of ZM was observed the formation of sigma phase, a brittle and undesirable phase. The welding parameters variation affected mainly the deformation experienced by the material, the average grain size and length of the weld zones. The mechanical tests were consistency with the observed microstructures, being the mechanical properties of joints higher than BM, which is very attractive from the technological point of view.
Concepção dos gestores municipais de saúde em relação ao acolhimento com avaliação de risco: limites e possibilidades
(Universidade Federal de São Carlos, 2013-04-09)
Sudré, Graciano Almeida
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Souza, Mariza Borges Brito de
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https://lattes.cnpq.br/0610841005775750
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https://lattes.cnpq.br/6780495629799281
This is a qualitative study aimed to evaluate the limits and possibilities for implementation of user embracement and risk assessment. In particular, from the perspective of local health managers of San Carlos, a town in the state of São Paulo. To collect the data, some semi-structured interviews were conducted with managers of the municipal health system: 61.53% graduated in nursing, 15.38% in medicine, 7.69% in dentistry; 7.69% in management and production engineering. The data were analyzed through thematic analysis. For this research, after collecting and analyzing data, six categories emerged from the analysis: (1) user embracement by organizing the service, (2) undesirable reality or constructed intentionally, (3) something intended but not accomplished, (4) A dream under construction, (5) learning to learn in daily service, (6) speaking the same language. From this definition, the study pointed out that there are different conceptions of user embracement , due to the approach assumed by each manager as suitable. There are also disparities in taking user embracement and under risk assessment as a procedure, possibly as a result of intricate political actions on health. To implement user embracement and risk assessment, it was possible to perceive the existence of limits and possibilities, with regards to organization of the service, local reality, care approaches, quality of assistance, permanent and continuing education as well as networking.
Gerenciamento do trabalho em saúde: as concepções de profissionais e usuários da estratégia saúde da família
(Universidade Federal de São Carlos, 2013-04-10)
Melo, Flávio Adriano Borges
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Ogata, Márcia Niituma
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https://lattes.cnpq.br/3274294833403570
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https://lattes.cnpq.br/2146448542549482
The management of health work is the art of thinking, deciding and acting, is the art of making things happen, to get results that can be defined, planned, analyzed and evaluated, but must be achieved through people and human interaction constant. It differs from health management in order to refer to the work being performed at the local level, so in the establichment of health. Based on these principles and the reality experienced in Multidisciplinary Residency Program in Community and Family Health at the Federal University of São Carlos/SP, we sought to develop this research has aimed at exploring the views of professionals and users of Health Strategy Family (HSF) on management of health work and specific objectives to analyze the perceptions of professionals and users FHS on management of health work, identify the type of management that exists in the Family Health Unit (FHU), identify how gives the participation of representatives of users on the Local Management Council (LMC) health with regard to the management of health work at FHU, identify the existence of potential and/or weaknesses brought about the development of democratic management in health and propose strategies that can facilitate the exercise of democratic management in health. This is a case study with a qualitative approach. The study took place in a FHU city of São Carlos/SP professionals that comprise this unit (doctor, nurse, dentist, nurse assistant, dental office assistants and community health workers) and user representatives from the LMC to that unit. Information obtained through interviews were analyzed using thematic analysis. Upon completion of the analysis, we determined the formation of three categories, which were: work health organization and management at the FHU, popular participation and control in health and social facilities and difficulties for the development of democratic management in health. The management of health work focused on democratic management in health still faces some difficulties in it's implementation. However, some issues like popular participation and teamwork strategies may be able to provide a labor organization horizontalized, defragmented, decentralized and coaccountability for decision-making of every individual members of the management structure.
Números racionais na forma fracionária: atividades para superar dificuldades de aprendizagem
(Universidade Federal de São Carlos, 2013-04-10)
Lima, Fernanda Soto
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Malagutti, Pedro Luiz Aparecido
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https://lattes.cnpq.br/5462523657624050
This dissertation presents the development of activities related to the teaching of rational numbers in fractional form so diverse and unique to the teacher and the students, through the exploitation of that content with manipulatives - construction of a fractional fractal card, use graph paper and in particular the construction of a curtain fractional color to the classroom - made in mathematics classes in 6th grade C Elementary School II of the afternoon, in order to show the importance and use of mathematical theory combined with practice. Highlights the importance of the teaching of mathematics, a brief history of the use of fractions in ancient Egyptian civilization and the construction of an instructional sequence based on the Didactic Engineering. Describes the steps for implementing the instructional sequence, its development in the classroom and conclusions pointing out that the use of manipulatives improves understanding of concepts related to rational numbers in fractional form. It also presents design variations, which can be developed by teachers in Elementary and High School.
Práticas populares utilizadas por gestantes de alto risco: existe suporte na literatura sobre essas práticas?
(Universidade Federal de São Carlos, 2013-04-10)
Suzuki, Liane Kiyomi
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El-khatib, Umaia
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https://lattes.cnpq.br/8417513594802650
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https://lattes.cnpq.br/1388070243053653
The usage of popular practices in order to either the treatment or prevention of both diseases and symptoms is very common along pregnancy, because of various maternal adaptations, frequent symptoms and requirement of special care. These popular practices are often regarded as healthy, beneficial and safe because they are "natural", however many plants are contraindicated because they may have toxic, teratogenic and abortifacient potential. The objective of study was to identify which popular practices (medicinal plants, homemade recipes and specific foods) are used by pregnant women at high risk for treatment and prevention of diseases or symptoms; to know the therapeutics indications; to check whether the information regarding these practices are cited sustention in technical literature, and if there are any contraindications throughout pregnancy. This is an clinical, cross-sectional and descriptive study done with 78 pregnant women who received medical and nutritional consultation on a clinic for high-risk cases at Maternity Santa Casa in São Carlos, within the period of April to July of 2012; these patients were interviewed based on a structured script, after the approval of the Ethics Committee and consent of the interviewees. For data analysis, it was used both simple descriptive statistics and chi-square tests. The results showed these pregnant women, in average, were 28.5 year-olds, and with 26.9 gestational weeks, which most of them were housewives, with family support; white, coming from the southeast; with 7 to 11 years of school; per capita income ½ to 1 minimum wage and evangelical religion. Independently of age, gestational age, ethnic groups, religion, education, income and region of origin, the pregnant women use the popular practices. From all the interviewed pregnant women, 64.10% confirmed the usage of some type of popular practice, related to symptoms of heartburn, flu, nausea, constipation, anxiety, diabetes, hypertension, cramps and others. Among the main popular practices used by the interviewed pregnant women, those with therapeutic indications are compatible with those described in the literature, except in the case of banana which effect over a cramp has not been scientifically proved. However, in many cases, their usage by pregnant women is contraindicated due to the teratogenic, abortive or toxic effects, such as in the cases of Boldo tea (Peumus boldus, Plectranthus barbatus), ginger (in high doses) (Zingiber officinale), immature papaya (Carica papaya), chamomile tea (Matricaria recutita), erva-cidreira tea (Melissa officinalis, Lippia alba, Cymbolponcitratus) and Melão-de-São-Caetano tea (Momordica charantia). To conclude, data about medicinal plants safety during pregnancy are scarce and often contradictory. More studies and researches are necessary about medicinal plants and popular practices done with teas, and not with plant extract, because this suggests that the quantities are excessively higher than those that would be consumed in teas. In the presence of any evidence suggesting risks for pregnancy, the usage of such plants should be avoided. The divulgation of results of this study should be done dialogically between health workers and users, so do not confront rather than ignore their cultural and popular knowledge, but that promotes reflection on their use of data obtained from the literature.
Estabelecimento de escrita sob controle de ditado como base para a recombinação na leitura e na escrita
(Universidade Federal de São Carlos, 2013-04-10)
Reis, Thaíze de Souza
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Souza, Deisy das Graças de
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https://lattes.cnpq.br/4404800720856419
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https://lattes.cnpq.br/3497049970396440
Several studies are interested in the acquisition of reading and spelling as well as in the role the acquisition of one ability plays in the acquisition of the other. However, many of these studies focus on reading rather than on spelling. This study aimed to teach spelling skills and verify whether it would affect the reading repertoire. To teach spelling, a constructed response matching to sample task was employed. In this task, a sample (that could be a printed word, a picture, a picture and its correspondent printed word or a dictated word) was presented as well as a pool of randomly chosen letters. Children had to select in the correct order the letters to spell the word correspondent to the sample. Thirty Portuguese words were taught. Five studies were conducted. In Study 1, each word was taught till criterion and once it was achieved the word was no longer presented during training. Two students took part but only one achieved the criterion for the totality of the words. Although the criterion was achieved rapidly for most words, the performance decreased on the posttest probes. Study 2 employed a mixed training: groups of three words were taught together so that in each trial one of the words worked as a sample. Study 3 employed the mixed training and a cumulative baseline: words previously taught were interspersed with words to be taught. Study 4 introduced a new variable, besides the mixed training and the cumulative baseline: a compound sample. In this study, words should be constructed under the control of a sample compounded by a picture and its correspondent printed word. After training, all participants of the Studies 2, 3 and 4 showed high spelling performances and excepting one participant, all of them had great improvements in reading. Reading scores were more variable than spelling scores. Performances with new words (compounded by the syllables of the taught words) were variable and some participants did not show recombinative repertoire. Also, some participants showed performances with some words before they were actually trained. Because of that, Study 5 employed a group design to evaluate the effect of the teaching procedure. The Experimental Group took the teaching procedure lessons (the same version employed in Study 4) while the Control Group was exposed only to the assessment sessions. The Experimental Group performances in spelling, reading and other relations evaluated were significantly higher than the Control Group performances. These results showed that the procedure have been effective in teaching spelling and also in promoting the emerge of reading.
Vivências dos fisioterapeutas egressos da Residência Multiprofissional em Saúde da Família e Comunidade
(Universidade Federal de São Carlos, 2013-04-11)
Costa, Mariana Lisboa
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Silva, Roseli Ferreira da
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https://lattes.cnpq.br/8525638483100858
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https://lattes.cnpq.br/1413847070289563
A formation in health, seeking population real needs, requires that Higher Education Institutions (IES) and the Sistema Único de Saúde (SUS) observe commitment, cooperation and responsible relationships towards the professional development. The Multi-professional Residency Program in Health is configured as a potential strategy to the professional development of abilities and formation for SUS. In this context, the goal of the present study was to analyze the physiotherapists‟ experiences that attended a multi-professional residency program in family and community health- RMSFC at a public university, intending to verify the repercussions of the professional practice. In the current qualitative case study participated nine former physiotherapists from a RMSFC. In order to collect data it was employed an Oral Story technique. For so much, a trigger question was elaborated, intending to explore the historical path of the physiotherapists‟ practice. Therefore, the interviews had been transcripted and transcreated for the accomplishment of the analysis, in which the sense interpretation method had been used. In the analysis, it had been defined the following outstanding themes: 1) From different starting points- in a search for an identity, and coming from different starting points, they were Setting sail on unknown seas . 2) A meeting point where a new identity is built - the residency was considered as a meeting place where it is possible to build a new identity. 3) The awkwardness of the labor world: new challenges and perspectives - the physiotherapists revealed through their professional experiences life as it is and 4) The future to God belongs! - the subjects wish to pursue different paths pointing that the essence of the dream is the fulfillment of the desire . It has been observed that the residency had an important role in the professional formation of the former physiotherapists, mostly in regard to the acquisition of a broad vision in health care in the primary attention, in the interaction and teamwork with other professionals. Nevertheless, the residency cannot become the savior of the fragmented educational process of graduation. It is necessary to continue investing in this health formation, as well in changes concerning the professional profile according to the Curriculum National Guidelines. For the residency programs is suitable to inquire if the developments of abilities to deal with life like it is should not be part of the egresses profile.
A formação do profissional de educação física e a perspectiva da saúde pública
(Universidade Federal de São Carlos, 2013-04-11)
Paulo, Camila Milan
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Della Barba, Patrícia Carla de Souza
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https://lattes.cnpq.br/6448489426438006
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https://lattes.cnpq.br/3129590242710218
The field work of physical education professional expansion that now considers their performance in health area and the implementation of Curriculum Guidelines for the graduate courses of Physical Education published in 2004 that also brings this perspective, so this study aimed to analyze the physical education professional formation of the public schools from São Paulo State under the health perspective. The methodological is based on a qualitative approach and the data collecting was achieved through document analysis of the pedagogical projects of the five schools analyzed in the study and semistructured interviews with the Course Coordinators of these schools. The dialogue between literature review and data research, built categories of analysis: a) A health focus: generally health content are still new in schools curricula, not having specifically targets to treat this perspective, b) Between reality and possibility: although the health content are not yet present in a systematic manner within the curriculum, two schools demonstrate innovative experiences that seek to break this situation, prioritizing comprehensive health care and multiprofessional work; c) Interdisciplinary content: schools showed a concern in breaking formats centric in unconnected contents, through the implementation of thematic curricula and synthesis disciplines, beyond experiences that value the multiprofessional work; d) Theory and practice in discussion: schools do not indicate clearly how the inseparability theory and practice is conceived within the curriculum of their courses, but merely to highlight the inseparability strategies (practice designed as a curriculum component, practical professional training and enrichment activities), proposed in National Curriculum Guidelines, yet not so cohesive and clear. Those questions indicate that changes should be thought either in the text of the National Curriculum Guidelines as the concept and elaboration of pedagogical projects from schools. Furthermore, the need for partnerships between university education and services, as well as the training of teachers for working in this area has appeared as emerging. The integrated curricula proposed, guided by the interprofessional education, interdisciplinary and problem-solving approach also emerged as a viable and effective alternative to changes in current reality.
Nano céria dopada com gadolínia: condutividade elétrica e correlação com a micro e nanoestrutura
(Universidade Federal de São Carlos, 2013-04-11)
Villas-Bôas, Lúcia Adriana
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Souza, Dulcina Maria Pinatti Ferreira de
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https://lattes.cnpq.br/4100119317525940
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https://lattes.cnpq.br/5196590498448169
Solid Oxide Fuel Cells (SOFCs) are clean and efficient energy conversion devices, considered as one of the key enabling technologies for future hydrogen economy and for stationary power generation. However novel materials are needed for reducing the working temperature which limits the economic viability of fuel cells due to long-term stability problems. Ceria-based electrolytes, due to their high ionic conductivity with respect to traditional zirconia-based electrolytes, are amongst the most promising oxide-ion conductors to be used in intermediate temperature SOFCs operating at 500-700 ºC with high efficiency. The major difficulty in using ceria as electrolyte is related to Ce+4 to Ce+3 reductions, which occurs at low oxygen partial pressure and at high temperature (this is the electrolyte condition at the anode region). Another drawback in using ceria solid solutions is the poor sinterability which requires high temperatures (1400-1600 ºC) to achieve high densification (> 95%), makes the manufacturing process costly. Several approaches in research have been done to reduce the device working temperature and also the electrolyte sintering temperature. In the present work, the concomitant use of sintering aids (Co and Zn) and nanopowders was investigated. Besides this, three distinct processing routes were adopted and afterwards sintered by a two-step process. The sinterability, microstructure, electrical conductivity and electrolyte domain of Co or Zn-doped Ce0.8Gd0.2O1.9 samples were evaluated against the performance of undoped powders. Cobalt or zinc additions were effective as sintering aid allowing peak sintering temperatures about 950 °C to reach densifications in excess of 93%, showing no evidence for the presence of secondary phases. The electrical properties and microstructure were dependent of processing route, additives and sintering profile. The total conductivity at 800 °C of pressed samples sintered at 1200 °C-1000 °C/10h with 0,4 mol% Zn (6.7x10-2 S/cm) and 2 mol% Co (7.4x10-2 S/cm) were similar to undoped samples (7.2x10-2 S/cm), showing that Zn and Co had a positive effect on densification without compromising the electrical conductivity and electrolyte domain.
Avaliação do desempenho dos ciclos de filtração e regeneração dos meios filtrantes com limpeza por pulso de ar reverso
(Universidade Federal de São Carlos, 2013-04-11)
Cirqueira, Samirys Sara Rodrigues
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Aguiar, Mônica Lopes
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https://lattes.cnpq.br/0431688649128529
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https://lattes.cnpq.br/2152791108686871
The presence of particles after the reverse air pulse cleaning process inside the filter medium ensures the increase in pressure drop of the subsequent cycle. The performance of the filter medium after several filtration cycles and cleaning cycles with reverse air pulse is not clearly known. For this purpose, the main objective of this work was to investigate the performance of the filter medium with reverse air pulse cleaning through the study of cleaning efficiency and by observing the regeneration of filter media. The satisfactory performance of the experimental unit was observed in the preliminary trials during filtration and cleaning by reverse air pulse having polypropylene and acrylic as filter media and phosphate concentrate as particulate matter. It was found that the increase in the number of filtration and cleaning cycles had an influence on the behavior of the filter media, when the filtration velocity was kept at 4 cm/s, the pressure drop at 200 Pa and with pulse time of 200 ms. It was observed that, even with the heterogeneity of filter media, particles were trapped on the surface of the fabric and the number of particles retained increased with the increase in the number of cycles. When comparing the filter media submitted to two hundred filtration and cleaning cycles, it was found that the polypropylene filter presented greater permeability, greater specific resistance and cake porosity, greater amount of mass retained after cleaning and greater cleaning efficiency than the acrylic filter using the same operational parameters. However, the performance was satisfactory for both filter media which, despite their differences, showed to be adequate for the operations of filtration and reverse air pulse cleaning.
O trabalho flexível no comércio varejista: multifuncionalidade e precarização
(Universidade Federal de São Carlos, 2013-04-11)
Santos, Silvio Matheus Alves
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Lima, Jacob Carlos
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https://lattes.cnpq.br/9244132532446607
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https://lattes.cnpq.br/8915024070223960
This dissertation dealt with job in the multinacional fast fashion retail. The research analysed speeches of permanent workers, that make part of an organization of flexible working, logic skills and multifunctionality, in search of targets in the carrier plan. In this context, we realized the process of job insecurity and work intensification when workers assume the responsability of personal and professional targets set by the enterprise. We also observed the impacts on their physical and psychological health. As results, we noticed that the work intensifies and become complex with the increasing of demand in celebratory events. Moreover, there are an increase of responsability and accumulation of tasks that appears according to the carrier plan. The research was made in two C& A stores in Aracaju-Sergipe in 2011. It was conducted through interviews with the workers, observations during working time, raising of materials and public documentation about the enterprise.
Fractais no ensino médio: uma sequência didática
(Universidade Federal de São Carlos, 2013-04-11)
Adami, Paulo Sérgio
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Sampaio, João Carlos Vieira
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https://lattes.cnpq.br/8286887389013685
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https://lattes.cnpq.br/8314031392359250
The intention of this dissertation is to describe a didactic sequence which aims at giving conditions to students so they are able to construct notions about the applications of fractal geometry and dynamical systems, aiding them in realizing the importance of mathematics to the development of the most diverse fields of human knowledge. Mathematics, so often emphasized in classrooms, privileges its procedural aspect, forcing the student not to perceive it as a dynamic science, linked to the comprehension of phenomena in the several fields of knowledge. Euclidean Geometry, thoroughly advertised, is, in general, more appropriate to the study of shapes found in houses, bridges and machine constructions among others, and the student might be taken to assume that mathematics is distant from the shapes observed beyond the windows of the classroom, such as in clouds, trees, rays that cut the skies and so on.
A crítica cinematográfica em O Diário de S. Paulo entre 1968 e 1969: um estudo sobre a experiência dos estudantes da Universidade de São Paulo
(Universidade Federal de São Carlos, 2013-04-11)
Bellinger, Isabella Mitiko Ikawa
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Araújo, Luciana Sá Leitão Corrêa de
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https://lattes.cnpq.br/9890886509956837
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https://lattes.cnpq.br/9457187037175172
This research is a study of the film section in O Diário de S. Paulo between July 1968 and June 1969. In this year, a group composed by Álvaro Ferreira, Claudio de Andrade (pseudonym initially used by Jean-Claude Bernardet), Djalma Batista, Eduardo Leone, Frida, Ismail Xavier, José Possi Neto, Marília Aires (now Marília Franco), Maurice Politi, Sérvulo Peres Siqueira e Valéria Silveira signed the film criticism in this journal. Most of these students were from the first Cinema s class in ECC-USP (Escola de Comunicações Culturais da Universidade de São Paulo), which later would become ECA-USP (Escola de Comunicações e Artes). Others came from Theater and Journalism. This experience in O Diário de S. Paulo is what we propose to study in this work.
Contribuições ao estudo do transporte eletrônico em nanofios semicondutores : localização e estados de interface
(Universidade Federal de São Carlos, 2013-04-11)
Simon, Ricardo de Almeida
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Chiquito, Adenilson José
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https://lattes.cnpq.br/7087360072774314
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https://lattes.cnpq.br/2832097534674031
In this work, we studied the influence of surface charges on the properties (especially electronic transport) of semiconductor nanowires and nanobelts via computer simulations and also they were compared to experimental results. After a brief introduction over possible applications of nanowires and nanobelts and a discussion of the processes of growth and device building for characterization of the structures, the theoretical foundations required for the development of models and equations used to determine the electronic properties of some structures of interest were presented. The first developed model takes into account the effects of charges distributed randomly on the surface of structures and shows their contribution to confinement and electron distribution in the nanostructures. This idea was applied to In2O3 nanobelts based devices and showed that the presence of surface charges pushes electrons to the center of nanobelt, making the electron-electron scattering mechanism important in electron transport. This behavior was also observed experimentally through a resistance-temperature experiments where was observed a decreasing resistance for T < 77K. This behavior was observed in nanobelts presenting smaller width and disappearing with increasing dimensions of the nanobelt. Roughly speaking, calculation results agree with the experimental ones confirming that disorder leads to a superficial random potential which in turn, controls the electron flow in the nanobelt. In view of the above results, a model was developed to study the influence of the superficial disorder in the formation of metal-semiconductor interfaces required to build a real device. In this new model, we studied the effect of surface charges on the profile of the conduction band of a germanium nanowire device on which usual Schottky and Ohmic contacts were defined. Again the results show that the presence of the random potential leads to localization of surface charges, generating the so-called surface states, which in turn alters the profile of the conduction band in every direction of the nanowire. As a result some changes in the calculated electric current were observed. The main influence of surface states is the changing the transport mechanism: from thermionic emission to diffusion of carriers. Various current-voltage (I-V) curves were then simulated at different temperatures and investigating the evolution of the transport mechanisms with the variation of the surface state density, we observed a decrease of the value of Schottky barrier height. Experimental values of Schottky barrier height obtained from fitting I-V curves for germanium nanowire devices are satisfactorily close to the results that we have obtained for a surface states density of 1013cm􀀀2. With this model is possible to determine both the dominant mechanism of current transport and also the barrier height and density of surface states characteristics of the device.
Estudos sobre a fotodegradação de poluentes catalisada por semicondutores: avaliação do papel do dopante nitrogênio na atividade de TiO2
(Universidade Federal de São Carlos, 2013-04-12)
Soares, Gabriela Byzynski
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Oliveira, Cauê Ribeiro de
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https://lattes.cnpq.br/5321313558714462
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https://lattes.cnpq.br/9466363821556466
The photodegradation of organic pollutants in water, catalyzed by semiconductors, is an important and well-known area but it is still necessary develop new materials showing visible photoactivity, in order to take advantage of solar energy. One important material that have gained attention in this field is TiO2 doped with nitrogen (N:TiO2), which absorbs in wavelengths until 450 cm-1. However, its photocatalytic activity is in discussion, and the mechanisms increasing its activity are not clear understood yet, such as when the dopant could be deleterious to the activity. Therefore, this work has as principal goal the discussion about TiO2 and N:TiO2 photocatalytic activity from consolidated literature evaluations and comparatively with electrochemical experiments, which can infer how electronic proprieties are modified in the doping process. For that, a simple method for TiO2 doping with nitrogen was developed, by modifying a polymeric precursor with urea. The predominant crystalline phase was anatase and the characterization indicated that the doping method was effective. The calcination temperature variation resulted in different N substitutional and interstitial quantities and the relation about both presented fundamental importance for the doped nanoparticles photocatalytic activity in visible light. Also, it was observed that visible activity is better associated with dye sensitizing mechanism than with oxidants radicals generation. Thus, electrochemical studies with solid electrodes produced by the same nanoparticles synthesized before (and not as thin films) were done, which showed lower less efficiencies for N:TiO2 electrode. It was also observed that the doping process reduces the semiconductor band gap energy and the Fermi level to more negatives potential values, decreasing the energetic barrier for electronic transfer between Fermi level and conduction band. These results confirmed the doping importance on the direct transfer electronic mechanism for the organic substrates over the hydroxyls radical generation mechanism, which is more common on the advanced oxidative process.