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Estudo da atividade eletrocatalítica de multicamadas metálicas de Ir/Pt e Cu/Pt eletrodepositadas sobre Pt(policristalina) para eletrooxidação de moléculas orgânicas pequenas
(Universidade Federal de São Carlos, 2013-09-26)
Antunes, Ettore Paredes
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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/5717478112353570
The search for alternative energy sources stead fossil fuel has driven the development of new energy generating devices. Among these, the Direct Alcohol Fuel Cells are a kind of device that directly convert chemical energy into electricity from short chain alcohols. However, it is necessary to develop electrodes with high catalytic activity. Several materials composed by Pt have been proposed in the literature in different metallic binary and tertiary compositions Metallic Multilayer (MM) systems. In this dissertation, were fabricated MM electrodes containing deposits of thin alternating layers of Ir/Pt, PtIr/Pt and Cu/Pt, all above Pt polycrystalline by chronoamperometry. We have used the technique of Factorial Design for screening the following variables: intermediate and external layers thickness and composition of the intermediate layers. For the electrooxidation of ethylene glycol, the structure that showed the highest electrocatalytic effect was Pt/Ir3.0/Pt3.0 (3.0 is the thickness of each layer in monolayers) that shows an increase of peak current density of 175% and lower activation energy about 26.2 kJ mol-1. Electrooxidation was monitored by FTIR in situ and was observed an increase of 255% on CO production of species during electrooxidation and anticipation in the process of formation of CO2 by 100 mV. The proposed structures for Cu/Pt MM were not formed, which was confirmed by AFM images, but clustered in grain, and the electrode Pt/Cu1,5/Pt9,0 grew by 78% in the peak current density in the electrooxidation methanol and also shift 200 mV to cathodic potentials in CO electrooxidation. Although these studies have not reached a definitive explanation, though the results were added to the dissertation.
Singularidade e universalidade em A interpretação dos sonhos, de Sigmund Freud
(Universidade Federal de São Carlos, 2013-09-26)
Mattos, André Santana
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Monzani, Luiz Roberto
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https://lattes.cnpq.br/2036732603638197
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https://lattes.cnpq.br/0371831964052713
In The interpretation of dreams, Freud presents a rich material of dream analyses, which is articulated with the establishment of general theses about the dream, leading into the metapsychological formulations about the psychic apparatus carried out in the seventh and last chapter. With the purpose of investigating the relations between singularity and universality that are characterized in the book, we have distinguished, among these three epistemic planes, two moments where it is constituted, in which one of them, a relation between two of those planes. In the first moment, we have analyzed the relation that finds itself in the domain between one dream and all dreams, i.e., between the detailed analysis of a singular dream and the general theses about the dream. We have identified that in the articulation between these two terms Freud makes use of the profound analysis of singular cases, taken as exemplar cases that present more clearly a determinate general characteristic of dream, but he also extends himself in brief analyses of various dreams, dwelling on the plurality of experience that articulates itself to a general thesis. In a second moment we have analyzed the relations that are at stake when we take the dream as one psychic formation among others, establishing epistemic relations with the psychopathological formations and with the psychic apparatus, which should be responsible for all psychic formations. While Freud initially intends to base the explication of psychopathological formations in the explication of dream, this epistemic order is inverted, in so far as it is based on the psychology of neurosis that he is going to justify the universality of the presence of the infantile desire on dream. In the same way, while a first reading that tried to understand the schema of the psychic apparatus only based on the interpretation of dreams would find its limit, it is necessary to recognize that there is a reciprocal subordination between the interpretation and the metapsychological explanation, as asserted by Monzani.
O ensino-aprendizagem de probabilidade em uma escola pública de Sorocaba/SP
(Universidade Federal de São Carlos, 2013-09-27)
Canaveze, Leila
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Oliveira, Paulo César
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https://lattes.cnpq.br/7516513469811353
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https://lattes.cnpq.br/0524706686441957
This qualitative work aims to describe and analyze a scenario of teachinglearning of the concept of Probability in three classes of the second grade of high school, a public school in the municipality of Sorocaba, State São Paulo. The look on this scenario of investigation was guided by the following research question: as occurs the teaching and learning in a context of tasks involving different probabilistic conceptions? For to answer this problem we developed a research field work where the researcher also played the role of teacher of such survey classes. With the help of the theory of semiotic representation records, analysis of the fieldwork revealed that the need to emphasize to students, through the application of tasks, the need for an adequate appropriation of terms pertinent to probabilistic language. The term that generated conflict in terms of meaning was the word luck. The option for minimizing the use of formulas has meant that students should use natural language and numerical registry as predominant forms of express written protocols of its activities. The use of products from records such as tree diagram and double-entry table had a supporting role in students ' writing process, getting restricted to set out the tasks explicitly demanded the student's activity using such forms of expression; or by the encouragement of a teacher-researcher. The educational intervention in support of the mobilization of different forms of semiotic registers, as the theoretical assumption of Raymond Duval, contributed to the learning of the concept of probability.
Avaliação da compatibilidade entre Y-TZP e BICUVOX para obtenção de compósitos condutores de íons de oxigênio
(Universidade Federal de São Carlos, 2013-09-27)
Piva, Roger Honorato
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Morelli, Márcio Raymundo
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https://lattes.cnpq.br/0172837599844991
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https://lattes.cnpq.br/0515321727144523
The BICUVOX is a potential candidate for devices that require materials with high ionic conductivity at intermediate temperatures. However, deficiencies such as low mechanical resistance and thermodynamic stability in reducing atmospheres have been introducing unsolved obstacles for technological appliance of this material. Unlike BICUVOX, the Y-TZP phase presents high mechanical resistance and high stability under reducing atmospheres. However, it does not display high ionic conductivity at intermediate temperatures. In this work we studied the compatibility between the BICUVOX and Y-TZP for the development of composites oxygen ion conductors. The composites were prepared by liquid phase and solid-state sintering. All characteristics were determined by XRD, SEM, DSC, diametral compression, impedance spectroscopy and treatments in H2 atmosphere. Using the BICUVOX as liquid phase additive, destabilization of tetragonal zirconia and formation of YVO4 take place. However, the solid state sintering enables the development of dense composite with up to 26% of Y-TZP. The composite with 26% of Y-TZP exhibited α = 10.10-6 ºC-1, which is a lower value than the one found for the BICUVOX, in addition to 144% higher mechanical resistance than for the BICUVOX. Also, for this composite a deleterious order-disorder transformation, γ ↔γ, was inhibited. All these improvements are attributed to the effect of Y-TZP both in the inhibition of grain growth, as well as in the preferential location among the grain boundaries of the BICUVOX matrix. However, the increase of grain boundaries and the Y-TZP as an additional phase, reduced the total electrical conductivity in composites. No resistance to γ-Bi4V1,8Cu0,2O10,7 phase decomposition was observed after exposure to H2. A general assessment indicates that the best properties are found in composite with 13 and 26% of Y-TZP, showing some improved properties in relation to each isolated materials.
Efeitos do treinamento de força no músculo esquelético de ratos jovens e senis
(Universidade Federal de São Carlos, 2013-09-27)
Lopes, Giselle Nunes
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Araújo, Heloísa Sobreiro Selistre de
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https://lattes.cnpq.br/4065824911933203
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https://lattes.cnpq.br/0104203971575071
Introduction: The skeletal muscle is the largest tissue present in vertebrates and is involved in locomotion, posture and breathing movements. It is composed of elongated, cylindrical and multinucleated muscle fibers with fat droplets in the sarcoplasma, known as intramyocellular lipid (IMCL) used as energy during exercise. Another source of energy used by the muscle is the carbohydrate stored in the body as glycogen, which is stored in the liver and muscle fibers. Muscle fibers are also surrounded by an extracellular matrix (ECM) formed, among other components, by collagen, mainly types I, III, IV and V. The aging process is associated with loss of muscle mass, muscle strength and function, increase of IMCL, reduction in glycogen synthesis with consequent insulin resistance, and also fibrosis and deposition of ECM. On the other hand, strength training (TF) is considered appropriate intervention to modify, minimize or reverse some physiological changes in skeletal muscle, as a result of aging. Thus, this study aimed to assess the cross section area of skeletal muscle fibers, amount of IMCL, glycogen content and MEC properties of the gastrocnemius (GAM) and soleus (SO) of young and senile rats after TF protocol. Methods: 28 rats were randomly divided into 4 groups: Youth (J); Old(S); Youth who underwent strength training (JT); Old who underwent strength training (ST). The animals performed strength training protocol consisting in climb a vertical ladder with weight strapped in their tails of 65%, 85%, 95% and 100% of the maximum load of the animal 3x a week for 12 weeks. CSA of muscle fibers, detection of collagen and identification of adipocytes in the GAM and SO muscles, beyond determinations of glycogen in the liver and skeletal muscle were performed. Results: Senile animals had lower CSA values, greater amount of IMCL, as well as of connective tissue in both muscles, but did not change the glycogen content in liver and muscle. After TF, the CSA increased in young and old animals in both muscles, the reduced IMCL in SO muscle of old animals, connective tissue decreased in young and old animals in both muscle and, finally, the glycogen content increased in liver and muscle of young and old animals. Conclusion: The strength training protocol in old rats was able to increase the CSA, decrease IMCL, increase of stored glycogen and decrease the connective tissue present in GAM and SO muscles. These results showed that there are changes in muscle fiber size, in the quantity of IMCL, in glycogen storage and in properties of the ECM of the GAM and SO muscle after intervention, indicating that strength training minimizes some deleterious effects inherent aging.
Planejamento da produção na indústria de embalagens em polpa moldada
(Universidade Federal de São Carlos, 2013-09-27)
Martínez, Karim Yaneth Pérez
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Toso, Eli Angela Vitor
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https://lattes.cnpq.br/6014128945023344
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Araujo, Silvio Alexandre de
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http://lattes.cnpq.br/9919773182316062
This research deals with the production planning and scheduling problem in the molded pulp packing industry, studying particularly a plant of molded pulp packages for eggs. The production process can be subdivided into two processes: molding process and printing process. The main challenge for production planning activities is on the molding process, where products are produced through tooling that have several molds. These tooling are called "Molding Patterns" or " Conformation Patterns". Each one of the molding patterns can contain one, two, until three kind of molds, allowing to produce several products simultaneously. Producing several products at the time can generate large inventory for low demand products and also null inventory for high demand products. Thus, different inventory levels are defined for each product based on their demand behavior, in order to control inventory quantities. In this way, decisions related to the production planning and scheduling in this production process involve deciding which molding patterns should used, how much time they should be used, and how they should be sequenced. All these should be make taking into account a parallel machine system and sequenced-dependent setups time and costs, in order to minimize inventory and setups costs, as well as penalties associated to inventory out of the specified inventory levels of each product. To represent this problem we proposed two formulations: the first one based on the Capacitated Lot Sizing and Scheduling Problem (CLSP), and the second one based on the General Lot Sizing and Scheduling Problem (GLSP). The results from the models were compared in a set of real word instances of a plant, in order to check the adequacy to represent the decisions involved in the studied production process, as well as the main differences between their production plans and performance of the models. The proposed formulations were also adapted for a particular instance, in order to compare their productions plans against the production plan implement by the studied plant. Results show that the proposed models represent rightly decisions involved in the production planning and scheduling in the molded pulp. Furthermore, the solutions obtained by the proposed models represent production plans with costs significantly lower than the schedule implemented by a real plant in this kind of industry.
Avaliação do híbrido CTA-MCM-41, modificado por poliestireno, na transesterificação catalítica de monoéster
(Universidade Federal de São Carlos, 2013-09-29)
Cruz, Ivana Helena da
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Cardoso, Dilson
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https://lattes.cnpq.br/2462847535959232
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https://lattes.cnpq.br/3731669911153393
The present work shows a new technique applied to the synthesis of heterogeneous catalysts MCM-41 containing basic alkylammonium cations and the study of stability in the transesterification reactions of monoesters. MCM-41 was developed by Mobil Oil Corporation in 1992 due to demand for materials with pore diameters in the range of mesoporous and is characterized by the arrangement of hexagonally ordered channels. Its synthesis involves precursors such as silicon source, hydroxyl source and surfactant, this latter in aqueous solution assumes the provision more favorable to their bi-functional character, forming a structure called a micelle. Recent polls show MCM-41, containing alkylammonium cations as an excellent base catalyst in fine chemistry and applicability in the production of biodiesel possessing strong basic sites related to the presence of anions siloxy ≡SiO- from interacting with the surfactant alkylammonium cations. The potential for reuse of heterogeneous catalysts brings economic benefits to the chemical processes involved, but the stability is needed in the different uses and leaching of these cations to the reaction observed in the different uses of the catalysts MCM-41 CTA+ reconciled to the loss of catalytic activity observed in literature motivated the search for new methods of synthesis with the aim of setting alkylammonium cations (CTA+) in the catalyst micelles. With this objective the styrene was used in synthesizing and expanding agent micellar enabling it inside the micelles and subsequent polymerization. X-ray diffraction, infrared spectroscopy in the region, elementary chemical analysis (CHN) techniques were used for characterization of new materials poly (styrene)-MCM-41 CTA+. The new catalysts provide high conversions (82%) transesterification of monoester (ethyl acetate) and methanol (1:6) at 50 ° C and were more stable catalytic achieving the proposed objective.
Transferência de oxigênio e condições de cisalhamento em biorreator convencional com impelidores orelha de elefante
(Universidade Federal de São Carlos, 2013-09-30)
Bustamante, Maritza Catalina Condori
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Badino Júnior, Alberto Colli
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https://lattes.cnpq.br/7269967957109739
Due to owing to the nature of culture involving aerobic filamentous microorganisms, conventional aerated stirred-tank bioreactors using the Rushton turbine impeller are widely employed in order to achieve good mixing and oxygen mass transfer. However, this impeller presents disadvantages such as high power consumption, and generates higher shear in the medium, which can cause irreversible morphological changes in microorganisms, damaging the culture performance. In literature, impellers called "Elephant Ear" (EE), presented in down-flow (down-pumping) (EEDP) and up-flow (up-pumping) (EEUP) configurations, are indicated as suitable for cultivation of shear sensitive cells. However, this characteristic has never been demonstrated quantitatively. In the present study, the oxygen transfer and hydrodynamics parameters were evaluated and compared in a conventional aerated stirredtank bioreactor equipped with impellers as the classical impeller Rushton turbine (RT) and with EE in EEDP and EEUP modes. Firstly, prediction equations were obtained for quantifying the average shear rate (Ýav) in the different systems, as function of the operating conditions (600≤N≤1000 rpm and 0.40≤Ýavar≤1.2 vvm) and rheological properties of the pseudoplastic fluids (K and n), based on a methodology that uses the volumetric oxygen transfer coefficient as characteristic parameter. The values of Ýav obtained from the correlations for the RT impeller were within a range of values estimated from correlations of the literature, showing that the methodology utilized is valid. Based on correlations of Ýav and on results of power consumption, the energy dissipation and Kolmogorov micro-scale (micro eddy sizes) could be estimated. For non-Newtonian fluids, the RT and EEUP impellers generated micro-eddies with smaller sizes in the range from 45.0-127.0 and 80.6-123.7 μm, respectively, showing that the impellers RT and EEUP are more shear than EEDP impeller. Using the prediction equations of Ýav the effect of shear conditions in cultures of Streptomyces clavuligerus were evaluated in conventional bioreactor equipped with RT, EEDP and EEUP impellers at 800 rpm, 0.50 vvm and 30C. Profiles of the volumetric oxygen transfer coefficient and shear rate were obtained during the cultivation. The morphological changes resulted from shear conditions imposed for the different impellers were analyzed using image analysis technique. The RT and EEDP impellers imposed the highest oxygen transfer and smaller shear to the broth, respectively. The flow pattern generated by EE impellers was crucial at the beginning of the cultivation, and is highly beneficial when EEUP impeller were used, since it presented a controlled shear throughout the cultivation. The best cultivation condition for the clavulanic acid production was obtained using the EEUP impeller, which resulted in a maximum concentration of 453 mg/L and a consistency index K= 2.5 Pa.s0.27. The results suggested that the isolated hyphae are directly related to the K of the broth and clavulanic acid production. According to the rapid fragmentation of clumps and emergence of isolated hyphae, it was concluded that the RT impeller presents shear rates higher than the EEs impellers, since the size of branched and non-branched hyphae were smaller and in greater quantities. This fact shows an advantage in the EEUP impeller use in shear sensitive microorganism cultures that requiring high levels of oxygen, without affecting the process performance. This advantage is associated with the flow pattern generated for the EEUP impeller.
Sinterização por micro-ondas em uma e em duas etapas de varistores à base de ZnO
(Universidade Federal de São Carlos, 2013-09-30)
Gunnewiek, Rodolfo Foster Klein
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Kiminami, Ruth Herta Goldschmidt Aliaga
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https://lattes.cnpq.br/7643216999108223
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https://lattes.cnpq.br/5185829124608696
This thesis is aimed at one-step microwave sintering at frequencies of 2.45 GHz and 30 GHz and the development of two-step microwave sintering (MW-TSS) at 2.45 GHz of ZnO-based nanostructured semiconductor compositions for application in varistors. The synthesis of nanostructured additives Mn, Cu, Cr, Co and Bi oxides with particles below 100 nm, based on the cationic exchange of soluble salt/polymer was developed and improved. After preparation and conformation, the samples were ultra-rapidly sintered at heating rates of 100 °C/min at 2.45 GHz and 20 °C/min at 30 GHz, both at 10 minutes of holding time, and in the two-step sintering the t2 holding time did not exceed one hour. The MW-TSS technique enabled us to reduce the pure ZnO average grain size from 4.85 (micro) to 2.85 (micro) while increasing density from 96.9% to 97.9%. For the Matsuoka nano composition, sintering at 30 GHz proved more effective, reaching a non-linear coefficient (atto) of 37 and a density of 96.5%. The addition of copper to the composition improved the value of (atto) reaching 71.4 at 2.45 GHz. However, the two-step sintering by microwave permitted a reduction in the average grain size and an increase in the electrical properties, reaching of 40 in the copper-free composition, and with the addition of copper it reached 83 with the breakdown electrical field achieving 14 kV/cm, with average grain size always below 3 μm, and, in the best condition in which the electrical properties were optimized, of merely 1.84. Although the average grain size attained is not located within the nanometric scale, sintering by microwave proved effective in obtaining varistors with excellent electrical properties, achieving finer microstructures when the two-step sintering by microwave technique is applied, with greatly reduced times for both one-step and two-step sintering techniques. The accelerated diffusional processes relative to the possible nonthermal effects caused by the microwave processing were also discussed.
A experiência da estereoscopia no audiovisual contemporâneo (2005-2012)
(Universidade Federal de São Carlos, 2013-09-30)
Cordebello, Pedro Dolosic
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Massarolo, João Carlos
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https://lattes.cnpq.br/3308336910966465
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https://lattes.cnpq.br/7962735326969600
Stereoscopic three dimensional pictures has gained significant importance in the entertainment industry nowadays. 3-D movies are intended to bring back the audience to the theater, and the stereoscopic television is the technology which will bring such immersive experience in the home. However, to produce, transport and show high quality stereoscopic content many skills and technologies are involved. The aim of this work is to bring some of the newest technological achievements in this area to anyone interested, and to contribute to scientific production in this research field.
O mal-estar em Guimarães Rosa - os empecilhos da cultura encenados nas famílias rosianas: a tragicidade da constituição cultural
(Universidade Federal de São Carlos, 2013-09-30)
Cardoso, Naiara Mangino
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Alves-Bezerra, Wilson
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https://lattes.cnpq.br/1602719736498812
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https://lattes.cnpq.br/3951720136978245
En este trabajo proponemos analizar tres cuentos de João Guimarães Rosa Sorôco, sua mãe, sua filha (1962), A terceira margem do rio (1962) y Meu tio o Iauaretê (1969) por medio de la teoría psicoanalítica. Las dos nociones principales que estructuraran nuestra lectura son: la cultura (Kultur), a partir de los estudios de Sigmund Freud (1930), y el significante, a través de los apuntes de Jacques Lacan (1957). Teniendo por base tales nociones pretendemos demostrar cómo en Rosa se arquitecta estéticamente la tragicidad de la constitución cultural (cf. Walnice Nogueira Galvão, 1978). La cultura (Kultur), establecida a partir de los tabúes que limitan la realización de los deseos humanos, causa malestar (Unbehagen). De este modo, el hombre crea una relación problemática con este universo lleno de privaciones fundamentadas en la Ley. Tal problemática es puesta en escena en estos tres cuentos rosianos de distintas maneras. Somos así, colocados delante del sentimiento de culpa oriundo de la instauración cultural (Freud, 1912-1913) , de la locura, y de la ilusión (Illusion) (cf. Freud, 1927) de un posible regreso a la Naturaleza tiempo mítico y místico de la plenitud del sujeto. Todo se pasa en el microcosmo de las relaciones familiares (padre e hijo en las márgenes del río, Sorôco, su madre y su hija, y el sobrino de Iauaretê), que se confrontan con las relaciones de parentesco (cf. Lévi-Strauss, 1949); o sea, prenderse en la familia perjudica la unión en la cultura (Kultur), que tiene por objetivo la supremacía de los lazos artificiales sociales en detrimento de las relaciones naturales (cf. Lévi-Strauss, 1949) familiares.
Abordagem do ensino de desvio padrão em livros didáticos
(Universidade Federal de São Carlos, 2013-09-30)
Francisco, Sérgio Luiz
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Moura, Renato José de
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https://lattes.cnpq.br/5227908949297904
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https://lattes.cnpq.br/7962308898758608
Teaching Statistics as part of the axis Treatment Information is seen by PCN (Parâmetros Curriculares Nacionais) as a tool for the interpretation of the world that surrounds the pupil, in view of the diversity of areas using the typical elements of Statistics (such as tables, graphs, etc.) in the dissemination of information. Hence, the need for teaching this subject should strive for contextualization of its contents and provide information for decision-making. The objective of this work was to present a didactic sequence that judges be more appropriate as the significance for the student with regard to the teaching of some of these elements of statistics, specifically the Standard Deviation, the application of an exercise in a class of 3rd. year of high school public school education in the city of Jahu. Together, adds that, after analysis of seven textbooks indicated by PNLEM programs (Programa Nacional do Livro Didático do Ensino Médio) and PNLD ((Programa Nacional do Livro Didático) as to approach the teaching of statistics, it was found that in one there is the option for this instructional sequence in which the settings of the approach is associated with the Normal Curve probabilities related to a frequency distribution. Expected to lead teachers and mentors to reflect on the teaching of this subject, both in performance in the classroom or guidance for professionals in education, as in the choice of books or other educational materials.
Desenvolvimento de três aplicativos educacionais para plataformas de tablets e smartphones baseados em sistemas iOS
(Universidade Federal de São Carlos, 2013-09-30)
Varjão, Ricardo Moreira
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Garcia, Ducinei
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https://lattes.cnpq.br/5236758856687873
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https://lattes.cnpq.br/5329334049890115
This study aimed to produce educational apps for tablets and smartphones targeted to teaching physics and mathematics that could be used both in the classroom and in informal places of learning and teaching. "Kinematics", "String" and "Equation" with themes of kinematic waves on strings and polynomial equations up to the third degree, respectively, three applications for iOS systems were developed. Until the release date at the Apple Store, between December 2011 and January 2012 up to September 2013 were made more than fourteen thousand downloads in one hundred and twelve countries spread across all continents. Comments sent to the author, both the virtual store, and through social networks, demonstrated the successful implementation of these new applications as educational tools.
Desenvolvimento de sistemas automáticos empregando flow-batch e multicomutação para análise fotométrica de amostras de interesse farmacêutico e agronômico
(Universidade Federal de São Carlos, 2013-09-30)
Pereira, Alessandra Félix da Costa
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Reis, Boaventura Freire dos
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https://lattes.cnpq.br/7619359855870896
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https://lattes.cnpq.br/3911505765005171
In this work is proposed the development of automated procedures with sufficient sensitivity for photometric determination of aluminium in water used for hemodialysis treatment and nickel in digested plants. ANVISA established that the maximum allowable concentration is 10 μg L-1 Al (III) in solution for hemodialysis. The matrix has a high concentration of salts such as Ca, Mg, K and about 30% (w/v) NaCl, thus causing difficult to determine the metal. This drawback was overcome in this work by employing a multicommuted flow-batch system and a LED photometer equipped with a flow cell with optical path length of 200 mm. There was no prior preparation of the sample and the method was based on the reaction of Al (III) with chromeazurol S, producing a compound of pink color, which absorbed electromagnetic radiation with maximum at 530 nm. After optimization of the parameters, the proposed procedure showed a linear response range between 5.0 and 125 μg L-1; a detection limit of 0.6 μg L-1; consumption of 12 mg and 85 mg S chromeazurol and hexamine per determination, respectively; a sampling frequency of 70 determination per hour and a waste generation of 1.6 mL per determination. To evaluate the accuracy of the methodology was employed standard addition and the results showed a recovery in the range 90-113 %. The analytical module for the determination of nickel was developed to implement the multicommutation process with the use of solenoid minipump as fluid propelling device. The procedure was developed based on the reaction with Ni (II) with dimethylglyoxime in alkaline medium, producing a compound which showed maximum absorption at 490 nm. After optimization of the control parameters, the proposed procedure showed a linear response in the range from 0.13 to 2.0 mg L-1; detection limit of 0.04 mg L-1; 2.40 mg consumption of trietanolamine; 2.00 mg of potassium persulfate; and 0.40 mg of dimethylglyoxime, all for determination.
Modelagem da eficiência de coleta em ciclones utilizando a fluidodinâmica computacional
(Universidade Federal de São Carlos, 2013-09-30)
Ramirez, Maribel Valverde
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Gonçalves, José Antônio Silveira
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https://lattes.cnpq.br/0337997526924402
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https://lattes.cnpq.br/9371597807489520
Cyclones are used to separate suspended particles from gas streams. The analysis of flow inside the cyclone is complex due to the large number of parameters and operating variables that influence the dynamics of the system. Due to its versatility of use and its robustness, results in computational fluid dynamic are an important alternative often used to study the dynamics of flow in the cyclone. In the literature, several works make use of computational fluid dynamics in order to study the pressure drop of cyclones. However, the works about the efficiency of collection are fewer. For the cyclone, computational fluid dynamics allows an accurately simulation of the collection efficiency of particles with diameter greater than 5 µm; but for particles with smaller diameters the simulated results diverge from experimental values. In this work, Stairmand s cyclone was numerically simulated with injected particles with diameters from 1 to 5 µm. The results were verified using available experimental data reported in the literature. The experimental data taken from literature belong to Zhao and Shen Kang (2004) and Zhao (2005). The simulation mesh was analyzed before and after the simulations. The turbulence models used in the simulation of flow in the cyclone were: Reynolds Stress Model (RSM) and Large Eddy Simulation (LES). The dispersed phase was simulated considering one and two way couplings. The equation of motion of the particles was integrated using the integration schemes: implicit, analytic, trapezoidal, and Runge-Kutta. The results showed that the methodology was adequate to reproduce the behavior of the flow in the cyclone. The error percentages obtained in pressure drop were under 5% and the average collection efficiency was reproduced with good accuracy for diameters of 3, 4 and 5 µm.
Nação em processo e identidades em trânsito: a face pós-colonial em o último voo do flamingo, de Mia Couto
(Universidade Federal de São Carlos, 2013-10-01)
Pimenta, Dionisio da Silva
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Valentim, Jorge Vicente
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https://lattes.cnpq.br/4427303771174064
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https://lattes.cnpq.br/5569800642482195
This work intends to analyse the novel O último voo do flamingo, by Mia Couto, through the postcolonial theory, showing how the narrative constructs a political criticism to the administration of a small village called Tizangara, possible metonymy of Mozambique. In this way, the goals are to demonstrate how some aesthetic resources that the novel uses, such as the satire, the uncommon, the oral tradition and the discursive construction of the difference, work as mechanisms of expurgation of a political corruption and contribute to the fiction to be a way of promoting the catharsis of a postcolonial locus.
Expressão heteróloga em Saccharomyces cerevisiae e ensaio de atividade de uma ß-1,4- endoglucanase isolada do cupim Velocitermes heteropterus (Isoptera, Termitidae)
(Universidade Federal de São Carlos, 2013-10-01)
Sabadine, Maria Augusta
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Cunha, Anderson Ferreira da
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https://lattes.cnpq.br/0329741640375661
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https://lattes.cnpq.br/7721637683679619
The current world scenery points out that the environment changes in the Earth planet is due to the intense use of fossil fuels along decades. This panorama launched the needs for the replacement of fossil fuels to sustained renewable fuels. In this context new technologies are being developed for the production of new bioenergy sources. The lignocellulosic biomass represents an abundant renewable source of cellulose on Earth. This is certainly one of the cheapest materials and therefore has been extensively studied as source of sustainable energy for industrial purposes. Several methods for obtaining bioethanol from lignocellulosic biomass are being seeked worldwide and in that regard it is essential that the Brazil could keep its natural leadership in this field of research. In this way, the use of cellulases from eukaryotic organisms has achieved high importance in the commercially-available enzymes repertoire with purpose to degrade lignocellulosic materials in reduction sugars (glucose) for the fermentation process. The termites, eusocial insects, are potential organisms for this research investment, because they feed lignocellulosic materials and their digestory system presents the enzymes for cellulose hydrolysis generating glucose for the industrial process for production second generation ethanol.. Thus, the identification, isolation and expression of termites cellulases can be considered are a key-step to search for enzymes suitable for the use of cellulose-derived glucose in current process of ethanol production implemented in Brazil. Velocitermes heteropterus can possibly express a cellulase of interest presumably active in the fermentation tanks. In this study, we identified, sequenced and cloned one of three major enzymes of the cellulose degradation system , the endo-1,4-ßglucanase from Velocitermes heteropterus. Our results showed a high expression of its enzyme in the yeast Saccharomyces cerevisiae (FGSC9721 strain). Experiments for purification and enzymatic activity of this enzyme are in development.
Da impotência à impossibilidade: a escrita do objeto a na pornografia de Hilda Hilst
(Universidade Federal de São Carlos, 2013-10-02)
Morel, Kátila Kristhina Kormann
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Alves-Bezerra, Wilson
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https://lattes.cnpq.br/1602719736498812
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https://lattes.cnpq.br/5122520095282946
In 1990, Hilda Hilst announces she would be leaving serious literature and would write pornografphy to earn money and readers. However, since the 1970s, there is in her speech a declared tension between what she writes and what editors and readers would like her to write. From the viewpoint of lacanian psychoanalysis, it can be said that in this speech is in question the attempt always impossible of satisfying the demand of the Other. Such discourse permeates the work of Hilda Hilst, so much so that her first prose tale, "Fluxo", has writing as a theme and as in line with his speech, the character Ruiska, writer, is also trying to satisfy the demand of the Other. Faced with this impasse between what he would like to write and what the editor required, Ruiska succumbs and goes mad. When Hilda Hilst announces she would write porn, she seems to have yielded to the pleas of publishers and would offer the target-object, object demanded. Various aspects of pornography make it operate via the sense, leading to an enjoyment of sense and thus getting the level of demand. However, Hilda Hilst, in the book O caderno rosa de Lori Lamby , subverts the usual procedures of pornography that would take this to operate via the sense, making her pornographic writing operate by way of the enjoyment out-of-sense, making an edge to the actual passing of impotence and inability for allowing something that meshes of desire. Thus, Hilda Hilst´s pornography now functions as an anal object a, double-face, which seems to have the brightness agalma, but which is actually garbage.
A internacionalização de empresas brasileiras e recrutamento de seus executivos: estudo de caso do grupo Gerdau
(Universidade Federal de São Carlos, 2013-10-02)
Julian, Erica Ambiel
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Donadone, Julio César
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https://lattes.cnpq.br/7643906508178259
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https://lattes.cnpq.br/5243693744850673
The present research seeks to explore the influence of international studies inside companies, this study is about managers hiring for transnational companies. The globalization of Brazilian businessare driven by the desire ofnew markets and growth capital, motivate by some Brazilian companies that occupy space in the global scenario. This is a result of several factors that make easy the transition of knowledge and managerial, people and capital, creating an open world market, and to receive strong competitors who aspire to work globally with consumers and employees. The consequences for thisprocess described are diverse within the internal scenarios in each country, both for those countries that receive foreign capital,or for those countries that allow the entry of foreign products, and for those who seek new horizons. Professionals who hold positions within these organizations turn into an international model. Their executives modify the professional profile of the field, transforming the way of hiring their successors to meet international requirements. The arrival of foreign structures to local, and mainly local expertise, renews the perception that agents have on the field of disputes, best professional positions in the job market also propose changes in the type of trajectory and how they make choices for desire positions of importance. Thus, besides the economic and cultural aspects surrounding the circulation of companies, it is interesting to note the changes in the social environment and internal policy related. To better understand the phenomenon described, was used this research in the Metalúrgica Gerdau S.A., its employees and its history.
Efeitos da eletroestimulação intravaginal e da eletroestimulação de superfície em mulheres com incontinência urinária de esforço
(Universidade Federal de São Carlos, 2013-10-03)
Correia, Grasiéla Nascimento
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Driusso, Patricia
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https://lattes.cnpq.br/8878717048564522
Several Studies evaluated the effects of intravaginal electrical stimulation (IVES) in the stress urinary incontinence (SUI) treatment. However, few studies assessed the effects of surface electrical stimulation (SES), which, according to studies, is effective to SUI, cheap, and less embarrassing to the patient. Despite these advantages of SES, the IVES is the most used type of electrotherapy in clinical practice. Moreover, there are not any studies which compared the effects of SES with the ones of IVES treatment, what justifies the importance of this doctoral studies. Two studies were performed. In the STUDY I the objective was to evaluate and compare the effects of SES e IVES in women with SUI. In the STUDY II, the objective was to verify the effects of SES in the pelvic floor muscle (PFM) electrical activity. In order to performe these studies, were included 45 women, with SUI and who were more than 50 years old. These volunteers were randomized in three groups: intravaginal electrical stimulation group (IVESG, n=15), surface electrical stimulation group (SESG, n=15), and control group (CG, n=15). The IVESG used intravaginal electrode in the treatment and the SESG performed the electrical stimulation with four silicone electrodes, bilaterally fixed in ischial tuberosity and suprapubic region. Both, IVESG and SESG performed 12 sessions of treatment (equipment Dualpex 961), with the same parameters. The CG did not receive any treatment during the corresponding time. In the STUDY I, the volunteers from all the groups performed the evaluation before and after the treatment. In which was performed the 1-hour pad test, the quality of life with the King s Health Questionnaire ad the evaluation of PFM function and pressure with the equipment (Peritron 9300). The STUDY II, which included the SESG and the CG, evaluated SUI severity by the 1-hour pad test, the PFM electrical activity and the quality of life with the International Consultation on Incontinence Questionnaire - Short Form (ICIQ-SF). The result of STUDY I show that the SES and IVES improved the SUI, PFM pressure and the quality of life. In the STUDY II was verified that the SES treatment also improved the PFM electrical activity. With the result of these studies it is possible to conclude that the SES and the IVES show a similar results and, therefore, both are important option of SUI treatment.