Processo identitário profissional: as experiências formativas de licenciandos do curso de Física - UFPI

In this research, we have as study object the identification process with the profession of students of the Undergraduate course for preparing professors for teaching Physics of the Federal University of Piauí. We start from the following question: - What relationships can be established among the senses given by the students to the group of the experiences lived in their initial formation and the identity construction as teacher? The presupposition is that the process of identification with the profession can contain formative experiences that are impossible to be reduced to the situations of disciplines learning. We considered that, in the development of the process of professional identification, the articulations and the connections that the students established with themselves, with the others - their formative teachers, managers - and with the world - the University, the public school - they should be understood in the interdependence relationships, consubstantiated in the experiences lived during the initial stage of their formation. Therefore, our objective is to understand the process of identification of the students with the teaching profession, based in the senses given to their formative experiences. In order to get this aim, we used the methodology of the Comprehensive Interview, and we chose as methodological and theoretical principles: the multi-referential theoretical framework, 'configuration and interdependence', the relationship among 'identity and alterity', the sensitive hearing and the 'intellectual craft'. The study is organized in two parts: the first, contains two chapters, that have introductory character. The second part is unfolded in five chapters, and it constitutes the development of the thesis. In the "paths", we revealed, starting from the actions and intentions that mobilized the students, processes involved in the choice of the course, and, this way, the initial identifications with the being an university student. We looked for to identify possible dissonances among the curriculum 'instituted and instituting', as well as the implications of its management of the formative experiences of future teachers. In short, we tried to capture, through the speeches of a group of students, the signs, the images and the senses of their formative experiences, which indicate as a vision of how their teaching profession is built. With this study, we sought to contribute for the researches on the field of degrees, taking as axis the formative processes that configure those courses. Finally, that the proposition of professor formation politics should be fundamentally based in internal demands, lived in the formative processes.

Influência da utilização do fluido de corte com adição de grafeno na temperatura de usinagem e formação de rebarba no processo de micro fresamento

As time passed, humanity needed the development of new materials used in various activities. High strength materials such as titanium and Inconel for example, had been studied because they are widely used for implants in biomedicine, as well as their use in aerospace and automotive industries. Because of its thermal and mechanical properties, these materials are considered difficult to machine, promoting a rapid wear of cutting tools, primarily caused by the high temperatures in machining. With the development of new materials has emerged the need of developing new manufacturing processes. One of today’s innovative processes is the micro-manufacturing. Being a process with a defined cutting tool geometry, burr formation is a constant and undesirable phenomenon formed during the machininig process. Being detrimental to the manufacturing process, overspending deburring operations are constantly employed leading to increase the aggregate cost to the manufactured material. Assembly components are also impaired if there is no control of the burr, with consequences including the disposal of components due to the occurence of this phenomenon. This paper presents the study of micro-milling Inconel 718, investigating influential parameters in the formation of burrs in order to minimize the occurrence of this phenome non. Different feed rates per tooth and cutting speed are evaluated, and different cutting fluids with different methods of applying the fluid. Adding graphene to cutting fluids was considered as a variable to be investigated, which is considered an excellent solid lubricant, in addition to increasing the thermal conductivity of the cooling solution (AZIMI; MOZAF FARI, 2015). The micro-milling temperature was evaluated in the present work. It was observed a new phenomenon that causes the machined surface temperature decreases below room temperature when using the solution water + oil. This phenomenon is explained in further chapters. In order to unravel this phenomenon, a new test was proposed and, from this test, it can be concluded, comparatively, which cutting fluid has a better cooling property.Using cutting fluid with different thermal properties has shown influence when analy zing burr formation and reducing machining temperature.

Avaliação da soldagem GMAW mecanizada e automatizada para união de dutos utilizando fontes convencional e com controle de curto- circuito

Welding is one of the most employed process for joining steel pipes. Although, manual welding is still the most used one, mechanized version and even automatized one have increased its demand. Thus, this work deals with girth welding of API 5L X65 pipes with 8” of nominal diameter and 8.0 mm thickness, beveled with V-30º narrow gap. Torch is moved by a bug carrier (mechanized welding) and further the parameters are controlled as a function of angular position (automatized welding). Welding parameters are presented for filling the joint with two-passes (root and filling/capping passes). Parameters for the root pass were extracted from previous author´s work with weldments carried out in plates, but validated in this work for pipe welding. GMAW processes were assessed with short-circuit metal transfer in both conventional and derivative modes using different technologies (RMD, STT and CMT). After the parameter determination, mechanical testing was performed for welding qualification (uniaxial tension, face and root bending, nick break, Charpy V-notch impact, microhardness and macrograph). The initially obtained results for RMD and CMT were acceptable for all testing and, in a second moment, also for the STT. However, weld beads carried out by using the conventional process failed and revealed the existence of lack of fusion, which required further parametrization. Thus, a Parameter-Variation System for Girth Welding (SVP) was designed and built to allow varying the welding parameters as a function of angular position by using an inclinometer. The parameters were set for each of the three angular positions (flat, vertical downhill and overhead). By using such equipment and approach, the conventional process with parameter variation allowed reducing the welding time for joint accomplishment of the order of 38% for the root pass and 30% for the filling/capping pass.

AVALIAÇÃO INSTITUCIONAL NA EDUCAÇÃO BÁSICA: UMA ANÁLISE DA PRÁTICA DA EDUCAÇÃO ADVENTISTA

O tema desta dissertação é a Avaliação Institucional da Educação Básica. Para tal, faz-se a análise do processo de avaliação, com ênfase no instrumento utilizado pelas Escolas Adventistas de nível básico do estado de São Paulo, considerando que a educação adventista se tornou uma parte consistente dentro da estrutura da Igreja Adventista do Sétimo Dia. Procurou-se, neste trabalho, como objetivo geral, compreender como se configura a prática da avaliação institucional das escolas da Rede Adventista de Educação. O método da investigação incluiu análise bibliográfica dos principais teóricos da área de políticas públicas e do sistema privado bem como da avaliação institucional, seguido de exame documental do instrumento utilizado no processo de avaliação institucional. O estudo resgata a contextualização histórica do desenvolvimento da escola privada, destacando aspectos relevantes de sua relação com o Estado. Também apresenta brevemente a história da Igreja Adventista do Sétimo Dia (IASD) nos Estados Unidos (EUA) e no Brasil, de modo a situar o surgimento do sistema educacional adventista, bem como a sua filosofia de ensino, buscando conhecer as origens desse grupo religioso que há mais de um século atua no cenário educacional brasileiro. Em seguida, aborda aspectos da Avaliação Institucional. Finalmente, apresenta-se uma síntese do processo e uma descrição analítica do instrumento de avaliação institucional das escolas de nível básico da Educação Adventista. Na conclusão do trabalho, não se encontraram indícios de que o conceito adventista de avaliação educacional seja diferente do das abordagens tradicionais. Entretanto, na concepção adventista de avaliação, existe mais fortemente a preocupação de se manter um processo de avaliação contínuo e sistemático.

Source apportionment of PM2.5 in Cork Harbour, Ireland using a combination of single particle mass spectrometry and quantitative semi-continuous measurements

An aerosol time-of-flight mass spectrometer (ATOFMS) was deployed for the measurement of the size resolved chemical composition of single particles at a site in Cork Harbour, Ireland for three weeks in August 2008. The ATOFMS was co-located with a suite of semi-continuous instrumentation for the measurement of particle number, elemental carbon (EC), organic carbon (OC), sulfate and particulate matter smaller than 2.5 μm in diameter (PM2.5). The temporality of the ambient ATOFMS particle classes was subsequently used in conjunction with the semi-continuous measurements to apportion PM2.5 mass using positive matrix factorisation. The synergy of the single particle classification procedure and positive matrix factorisation allowed for the identification of six factors, corresponding to vehicular traffic, marine, long-range transport, various combustion, domestic solid fuel combustion and shipping traffic with estimated contributions to the measured PM2.5 mass of 23%, 14%, 13%, 11%, 5% and 1.5% respectively. Shipping traffic was found to contribute 18% of the measured particle number (20–600 nm mobility diameter), and thus may have important implications for human health considering the size and composition of ship exhaust particles. The positive matrix factorisation procedure enabled a more refined interpretation of the single particle results by providing source contributions to PM2.5 mass, while the single particle data enabled the identification of additional factors not possible with typical semi-continuous measurements, including local shipping traffic.

Mechanistic Models of Anti-HIV Microbicide Drug Delivery

A new modality for preventing HIV transmission is emerging in the form of topical microbicides. Some clinical trials have shown some promising results of these methods of protection while other trials have failed to show efficacy. Due to the relatively novel nature of microbicide drug transport, a rigorous, deterministic analysis of that transport can help improve the design of microbicide vehicles and understand results from clinical trials. This type of analysis can aid microbicide product design by helping understand and organize the determinants of drug transport and the potential efficacies of candidate microbicide products.

Microbicide drug transport is modeled as a diffusion process with convection and reaction effects in appropriate compartments. This is applied here to vaginal gels and rings and a rectal enema, all delivering the microbicide drug Tenofovir. Although the focus here is on Tenofovir, the methods established in this dissertation can readily be adapted to other drugs, given knowledge of their physical and chemical properties, such as the diffusion coefficient, partition coefficient, and reaction kinetics. Other dosage forms such as tablets and fiber meshes can also be modeled using the perspective and methods developed here.

The analyses here include convective details of intravaginal flows by both ambient fluid and spreading gels with different rheological properties and applied volumes. These are input to the overall conservation equations for drug mass transport in different compartments. The results are Tenofovir concentration distributions in time and space for a variety of microbicide products and conditions. The Tenofovir concentrations in the vaginal and rectal mucosal stroma are converted, via a coupled reaction equation, to concentrations of Tenofovir diphosphate, which is the active form of the drug that functions as a reverse transcriptase inhibitor against HIV. Key model outputs are related to concentrations measured in experimental pharmacokinetic (PK) studies, e.g. concentrations in biopsies and blood. A new measure of microbicide prophylactic functionality, the Percent Protected, is calculated. This is the time dependent volume of the entire stroma (and thus fraction of host cells therein) in which Tenofovir diphosphate concentrations equal or exceed a target prophylactic value, e.g. an EC50.

Results show the prophylactic potentials of the studied microbicide vehicles against HIV infections. Key design parameters for each are addressed in application of the models. For a vaginal gel, fast spreading at small volume is more effective than slower spreading at high volume. Vaginal rings are shown to be most effective if inserted and retained as close to the fornix as possible. Because of the long half-life of Tenofovir diphosphate, temporary removal of the vaginal ring (after achieving steady state) for up to 24h does not appreciably diminish Percent Protected. However, full steady state (for the entire stromal volume) is not achieved until several days after ring insertion. Delivery of Tenofovir to the rectal mucosa by an enema is dominated by surface area of coated mucosa and whether the interiors of rectal crypts are filled with the enema fluid. For the enema 100% Percent Protected is achieved much more rapidly than for vaginal products, primarily because of the much thinner epithelial layer of the mucosa. For example, 100% Percent Protected can be achieved with a one minute enema application, and 15 minute wait time.

Results of these models have good agreement with experimental pharmacokinetic data, in animals and clinical trials. They also improve upon traditional, empirical PK modeling, and this is illustrated here. Our deterministic approach can inform design of sampling in clinical trials by indicating time periods during which significant changes in drug concentrations occur in different compartments. More fundamentally, the work here helps delineate the determinants of microbicide drug delivery. This information can be the key to improved, rational design of microbicide products and their dosage regimens.

Continuidades y rupturas en el proceso de centralización de la administración sanitaria argentina (1880-1945)

El objetivo del trabajo es presentar el proceso de centralización administrativa de la repartición sanitaria nacional. Para ello se analizan, en primer lugar y con la intención de situar el problema en un plazo más largo, los límites que debió afrontar el Departamento Nacional de Higiene desde el momento de su creación, en 1880, para avanzar en sus intenciones centralizadoras. Entre ellos se encuentran su escasa autonomía administrativa, las superposiciones jurisdiccionales con otras dependencias del Estado, las indefiniciones respecto de su supremacía jerárquica, la resistencia de las provincias, los municipios fuertes y las asociaciones benéficas y los conflictos de proyectos al interior mismo de la repartición. En segundo lugar se muestra cómo los sucesivos presidentes del Departamento Nacional de Higiene asumieron ese límite para su gestión y apostaron a la organización interna de la repartición antes que al desafío de la centralización de la asistencia sanitaria. Su estrategia fue el fortalecimiento de nuevas áreas de incumbencia que constituyeron una agenda que sirvió como base de la definitiva centralización de la administración sanitaria. En esta tarea contaron con el apoyo parlamentario, fundamentalmente de la bancada socialista, que logró convertir en ley durante los años 30 a una serie de nuevas atribuciones del Departamento en aspectos que ligaban la salud con la asistencia social. Por último se analiza un momento clave de este proceso, el primer ensayo de centralización sanitaria a través de la creación, en 1943, de la Dirección Nacional de Salud Pública y Asistencia Social.

Continuidades y rupturas en el proceso de centralización de la administración sanitaria argentina (1880-1945)

El objetivo del trabajo es presentar el proceso de centralización administrativa de la repartición sanitaria nacional. Para ello se analizan, en primer lugar y con la intención de situar el problema en un plazo más largo, los límites que debió afrontar el Departamento Nacional de Higiene desde el momento de su creación, en 1880, para avanzar en sus intenciones centralizadoras. Entre ellos se encuentran su escasa autonomía administrativa, las superposiciones jurisdiccionales con otras dependencias del Estado, las indefiniciones respecto de su supremacía jerárquica, la resistencia de las provincias, los municipios fuertes y las asociaciones benéficas y los conflictos de proyectos al interior mismo de la repartición. En segundo lugar se muestra cómo los sucesivos presidentes del Departamento Nacional de Higiene asumieron ese límite para su gestión y apostaron a la organización interna de la repartición antes que al desafío de la centralización de la asistencia sanitaria. Su estrategia fue el fortalecimiento de nuevas áreas de incumbencia que constituyeron una agenda que sirvió como base de la definitiva centralización de la administración sanitaria. En esta tarea contaron con el apoyo parlamentario, fundamentalmente de la bancada socialista, que logró convertir en ley durante los años 30 a una serie de nuevas atribuciones del Departamento en aspectos que ligaban la salud con la asistencia social. Por último se analiza un momento clave de este proceso, el primer ensayo de centralización sanitaria a través de la creación, en 1943, de la Dirección Nacional de Salud Pública y Asistencia Social.

Continuidades y rupturas en el proceso de centralización de la administración sanitaria argentina (1880-1945)

El objetivo del trabajo es presentar el proceso de centralización administrativa de la repartición sanitaria nacional. Para ello se analizan, en primer lugar y con la intención de situar el problema en un plazo más largo, los límites que debió afrontar el Departamento Nacional de Higiene desde el momento de su creación, en 1880, para avanzar en sus intenciones centralizadoras. Entre ellos se encuentran su escasa autonomía administrativa, las superposiciones jurisdiccionales con otras dependencias del Estado, las indefiniciones respecto de su supremacía jerárquica, la resistencia de las provincias, los municipios fuertes y las asociaciones benéficas y los conflictos de proyectos al interior mismo de la repartición. En segundo lugar se muestra cómo los sucesivos presidentes del Departamento Nacional de Higiene asumieron ese límite para su gestión y apostaron a la organización interna de la repartición antes que al desafío de la centralización de la asistencia sanitaria. Su estrategia fue el fortalecimiento de nuevas áreas de incumbencia que constituyeron una agenda que sirvió como base de la definitiva centralización de la administración sanitaria. En esta tarea contaron con el apoyo parlamentario, fundamentalmente de la bancada socialista, que logró convertir en ley durante los años 30 a una serie de nuevas atribuciones del Departamento en aspectos que ligaban la salud con la asistencia social. Por último se analiza un momento clave de este proceso, el primer ensayo de centralización sanitaria a través de la creación, en 1943, de la Dirección Nacional de Salud Pública y Asistencia Social.

Data-Driven Dynamic Modeling of Coupled Thermal and Electric Outputs of Microturbines

Microturbines are among the most successfully commercialized distributed energy resources, especially when they are used for combined heat and power generation. However, the interrelated thermal and electrical system dynamic behaviors have not been fully investigated. This is technically challenging due to the complex thermo-fluid-mechanical energy conversion processes which introduce multiple time-scale dynamics and strong nonlinearity into the analysis. To tackle this problem, this paper proposes a simplified model which can predict the coupled thermal and electric output dynamics of microturbines. Considering the time-scale difference of various dynamic processes occuring within microturbines, the electromechanical subsystem is treated as a fast quasi-linear process while the thermo-mechanical subsystem is treated as a slow process with high nonlinearity. A three-stage subspace identification method is utilized to capture the dominant dynamics and predict the electric power output. For the thermo-mechanical process, a radial basis function model trained by the particle swarm optimization method is employed to handle the strong nonlinear characteristics. Experimental tests on a Capstone C30 microturbine show that the proposed modeling method can well capture the system dynamics and produce a good prediction of the coupled thermal and electric outputs in various operating modes.

Data-Driven Dynamic Prediction of Interrelated Heat and Electric Outputs of Microturbines

Microturbines are among the most successfully commercialized distributed energy resources, especially when they are used for combined heat and power generation. However, the interrelated thermal and electrical system dynamic behaviors have not been fully investigated. This is technically challenging due to the complex thermo-fluid-mechanical energy conversion processes which introduce multiple time-scale dynamics and strong nonlinearity into the analysis. To tackle this problem, this paper proposes a simplified model which can predict the coupled thermal and electric output dynamics of microturbines. Considering the time-scale difference of various dynamic processes occuring within microturbines, the electromechanical subsystem is treated as a fast quasi-linear process while the thermo-mechanical subsystem is treated as a slow process with high nonlinearity. A three-stage subspace identification method is utilized to capture the dominant dynamics and predict the electric power output. For the thermo-mechanical process, a radial basis function model trained by the particle swarm optimization method is employed to handle the strong nonlinear characteristics. Experimental tests on a Capstone C30 microturbine show that the proposed modeling method can well capture the system dynamics and produce a good prediction of the coupled thermal and electric outputs in various operating modes.

Continuidades y rupturas en el proceso de centralización de la administración sanitaria argentina (1880-1945)

El objetivo del trabajo es presentar el proceso de centralización administrativa de la repartición sanitaria nacional. Para ello se analizan, en primer lugar y con la intención de situar el problema en un plazo más largo, los límites que debió afrontar el Departamento Nacional de Higiene desde el momento de su creación, en 1880, para avanzar en sus intenciones centralizadoras. Entre ellos se encuentran su escasa autonomía administrativa, las superposiciones jurisdiccionales con otras dependencias del Estado, las indefiniciones respecto de su supremacía jerárquica, la resistencia de las provincias, los municipios fuertes y las asociaciones benéficas y los conflictos de proyectos al interior mismo de la repartición. En segundo lugar se muestra cómo los sucesivos presidentes del Departamento Nacional de Higiene asumieron ese límite para su gestión y apostaron a la organización interna de la repartición antes que al desafío de la centralización de la asistencia sanitaria. Su estrategia fue el fortalecimiento de nuevas áreas de incumbencia que constituyeron una agenda que sirvió como base de la definitiva centralización de la administración sanitaria. En esta tarea contaron con el apoyo parlamentario, fundamentalmente de la bancada socialista, que logró convertir en ley durante los años 30 a una serie de nuevas atribuciones del Departamento en aspectos que ligaban la salud con la asistencia social. Por último se analiza un momento clave de este proceso, el primer ensayo de centralización sanitaria a través de la creación, en 1943, de la Dirección Nacional de Salud Pública y Asistencia Social.

3D nanoimprint technology for NIR Fabry-Pérot filter arrays

Im Rahmen dieser Arbeit wird die Herstellung von miniaturisierten NIR-Spektrometern auf Basis von Fabry-Pérot (FP) Filter Arrays behandelt. Bisher ist die kostengünstige Strukturierung von homogenen und vertikal erweiterten Kavitäten für NIR FP-Filter mittels Nanoimprint Technologie noch nicht verfügbar, weil die Qualität der Schichten des Prägematerials unzureichend ist und die geringe Mobilität der Prägematerialien nicht ausreicht, um die vertikal erweiterten Kavitäten zu füllen. Diese Arbeit konzentriert sich auf die Reduzierung des technischen Aufwands zur Herstellung von homogenen und vertikal erweiterten Kavitäten. Zur Strukturierung der Kavitäten wird ein großflächiger substratkonformer UV-Nanoimprint Prozess (SCIL - Substrate Conformal Imprint Lithoghaphy) verwendet, der auf einem Hybridstempel basiert und Vorteile von harten und weichen Stempeln vereint. Um die genannten Limitierungen zu beseitigen, werden alternative Designs der Kavitäten untersucht und ein neues Prägematerial eingesetzt. Drei Designlösungen zur Herstellung von homogenen und erweiterten Kavitäten werden untersucht und verglichen: (i) Das Aufbringen des Prägematerials mittel mehrfacher Rotationsbeschichtung, um eine höhere Schichtdicke des Prägematerials vor dem Prägeprozess zu erzeugen, (ii) die Verwendung einer hybriden Kavität bestehend aus einer strukturierten Schicht des Prägematerials eingebettet zwischen zwei Siliziumoxidschichten, um die Schichtdicke der organischen Kavität zu erweitern und (iii) die Optimierung des Prägeprozesses durch Verwendung eines neuen Prägematerials. Die mit diesen drei Ansätzen hergestellten FP-Filter Arrays zeigen, hohe Transmissionen (beste Transmission > 90%) und kleine Linienbreiten (Halbwertsbreiten <5 nm).

Decisions, decisions everywhere (in the open data era).

Abstract: Decision support systems have been widely used for years in companies to gain insights from internal data, thus making successful decisions. Lately, thanks to the increasing availability of open data, these systems are also integrating open data to enrich decision making process with external data. On the other hand, within an open-data scenario, decision support systems can be also useful to decide which data should be opened, not only by considering technical or legal constraints, but other requirements, such as "reusing potential" of data. In this talk, we focus on both issues: (i) open data for decision making, and (ii) decision making for opening data. We will first briefly comment some research problems regarding using open data for decision making. Then, we will give an outline of a novel decision-making approach (based on how open data is being actually used in open-source projects hosted in Github) for supporting open data publication. Bio of the speaker: Jose-Norberto Mazón holds a PhD from the University of Alicante (Spain). He is head of the "Cátedra Telefónica" on Big Data and coordinator of the Computing degree at the University of Alicante. He is also member of the WaKe research group at the University of Alicante. His research work focuses on open data management, data integration and business intelligence within "big data" scenarios, and their application to the tourism domain (smart tourism destinations). He has published his research in international journals, such as Decision Support Systems, Information Sciences, Data & Knowledge Engineering or ACM Transaction on the Web. Finally, he is involved in the open data project in the University of Alicante, including its open data portal at http://datos.ua.es

Chemical Loop Reforming dell'etanolo: studio della reattività di ferriti modificate

Modified ferrites with a generic formula of MFe2O4 (where M=Co, Cu, Mn and their combination: Cu/Co, Cu/Mn and Co/Mn) were studied as potentially attractive ionic oxygen and electron carrier materials for the production of “clean H2” via the Chemical Loop Reforming (CLR) of bio-ethanol. The conventional CLR process consists of 2 steps: 1st - the reduction step with ethanol; 2nd - the re-oxidation step with water. The synthesized materials were tested in a laboratory plant in terms of both redox properties and catalytic activity to generate hydrogen during the re-oxidation step with water steam over previously pre-reduced samples. The obtained results showed that CuFe2O4, Cu0.5Co0.5Fe2O4, Cu0.5Mn0.5Fe2O4 and CoFe2O4 within 20 min of ethanol reduction reached almost a complete reduction, and, as a consequence, the higher yields to H2 produced during the re-oxidation step with steam. On the other hand, incorporation of Mn-cations greatly affects the redox properties of a resulted spinel (MnFe2O4 and Co0.5Mn0.5Fe2O4) leading to its lower reducibility, caused by the formation of a hardly reducible layer of MnxFeyO oxide. Moreover, the presence of Mn-cations effectively reduces the amount of coke formed during the anaerobic reduction step with ethanol and hence avoids a fast deactivation of the material. Modification of the conventional CLR process with an addition of the 3rd regeneration step (carried out with air) was done in order to increase the stability of the looping material and to overcome the deactivation problems, such as: a coke deposition/accumulation and an incomplete re-oxidation of M0 during the 2nd step.