Obtenção de filtro cerâmico a partir da diatomita e casca de arroz carbonizada visando tratamento de efluente têxtil

The effluents released by the textile industry have high concentrations of alkali, carbohydrates, proteins, in addition to colors containing heavy metals. Therefore, a filter was prepared aiming primarily to the removal of color. In order to prepare this filter, rice hulls and diatomite were used, which have in their structure, basically amorphous hydrated silica. The silica exists in three crystalline forms: quartz, tridymite and cristobalite. In accordance with the above considerations, this study was divided into two stages; the first corresponds to the preparation of the filter and the second to carry out the tests in the effluent/filter in order to verify the efficiency of the color removal. First, the raw material was subjected to a chemical analysis and XRD, and then the diatomite was mixed, via humid, with a planetarium windmill with 20 %, 40 %, 60 % and 80 % of rice husk ash. To the mixture, 5 % carboxymethylcellulose (CMC) was added as a binder at room temperature. The samples were uniaxially compacted into metallic matrix of 0.3 x 0.1 cm² of area at a pressure of 167 MPa by means of hydraulic press and then sintered at temperatures of 1,000 °C, 1,200 °C and 1,400 °C for 1 h and submitted to granulometry test using laser, linear retraction, water absorption, apparent porosity and resistance to bending, DTA, TMA and XRD. To examine the pore structure of the samples scanning electron microscope (SEM) was used. Also tests were carried out in a mercury porosimeter to verify the average size of the pores and real density of the samples. In the second stage, samples of the effluent were collected from a local industry, whose name will be preserved, located in Igapó, in the State of Rio Grande do Norte - RN. The effluent was first pretreated before filtration and then subjected to a treatment of flotation. The effluent was then characterized before and after filtration, with parameters of color, turbidity, suspended solids, pH, chemical and biochemical oxygen demand (COD and BOD). Thus, through the XRD analysis the formation of cristobalite α in all samples was observed. The best average size of pore was found to be 1.75 μm with 61.04 % apparent porosity, thus obtaining an average 97.9 % color removal and 99.8 % removal of suspended solid

Estudo estatístico sobre eventos de precipitação intensa no nordeste do Brasil

The Northeast of Brazil (NEB) shows high climate variability, ranging from semiarid regions to a rainy regions. According to the latest report of the Intergovernmental Panel on Climate Change, the NEB is highly susceptible to climate change, and also heavy rainfall events (HRE). However, few climatology studies about these episodes were performed, thus the objective main research is to compute the climatology and trend of the episodes number and the daily rainfall rate associated with HRE in the NEB and its climatologically homogeneous sub regions; relate them to the weak rainfall events and normal rainfall events. The daily rainfall data of the hydrometeorological network managed by the Agência Nacional de Águas, from 1972 to 2002. For selection of rainfall events used the technique of quantiles and the trend was identified using the Mann-Kendall test. The sub regions were obtained by cluster analysis, using as similarity measure the Euclidean distance and Ward agglomerative hierarchical method. The results show that the seasonality of the NEB is being intensified, i.e., the dry season is becoming drier and wet season getting wet. The El Niño and La Niña influence more on the amount of events regarding the intensity, but the sub-regions this influence is less noticeable. Using daily data reanalysis ERAInterim fields of anomalies of the composites of meteorological variables were calculated for the coast of the NEB, to characterize the synoptic environment. The Upper-level cyclonic vortex and the South atlantic convergene zone were identified as the main weather systems responsible for training of EPI on the coastland

Análise das manifestações auditivas em individuos com hipertensão arterial sistêmica

Objective: To determine the prevalence of auditory manifestations in individuals with hypertension and analyze the association between hearing loss, systemic hypertension and quality of life in hypertensive patients. Method: This was a prospective, observational, case-control study, carried out from June 2010 to December 2013 at the University Hospital Onofre Lopes, in Natal, Brazil, which involved 120 patients of both sexes were analyzed with a diagnosis of hypertension and 120 patients without a diagnosis of hypertension. The audiological function was assessed by tonal and vocal audiometry. The quality of life was defines by the MINICHAL BRASIL questionnaire. Results: The prevalence of hearing loss was high in both groups (82.5 % and 75.8 %, in hypertension group and control, respectively, p=0.003). The sensorineural was the most common type of hearing loss (48.5 %) in hypertension group while conductive hearing loss was predominant (61.5 %) in the control group. There were no difference in the intensity of hearing loss between the groups (p=0,21). The main hearing complaint was hearing loss (51 %), followed by ear pain (14 %). There was worse quality of life in hypertensive individuals with hearing loss (p= 0.0001). Conclusion: Hypertensive individuals showed higher prevalence of auditory events, including hearing loss, sensorineural hearing loss is predominant . Hearing loss is associated with worse quality of life of hypertensive individuals even when these pressure values are within normal limits

O sistema de certificação do etanol brasileiro sob a ótica do princípio constitucional do desenvolvimento sustentável

The gradual inclusion of biofuels is a necessary change that countries must include in their energy mixes. Energy sources still widely used in the world, such as oil and coal, are endowed with a high pollution load to the environment, bringing damages to the water, to the air and to humans as well. In addition, although there are conflicting studies, they are also identified as major causes of the greenhouse effect and the global warming phenomenon. They are, moreover, finite sources of energy, given that its reserves will surely run out. However, even if the introduction of biofuels, such as ethanol, in the energy mix is crucial for the survival of the present and future populations, this insertion cannot settle so disorderly and, thus, one must ensure the quality of these resources and promote transparency in international trade. In this manner, a certification process for ethanol is essential to attest that this biofuel meets the sustainable requirements defined for its production. Hence, this study sought to address the importance of the adoption of certification in the ethanol industry, according to the principle of sustainable development, by analyzing the evolution of its concept, its combination with the fundamental objectives sculptured in the Constitution of 1988, its regulation under Brazilian laws and the need for a balance between economic activities and the mentioned principle. The work also encompassed the criteria used to establish certification standards and their participating actors, combined with a study of ongoing initiatives. Finally, the consequences of the adoption of a certification process for ethanol in Brazil were presented, both in terms of sustainable development and in international trade

Ensinar/Aprender ortografia: uma experiência na formação de professores

The studies in the education area have been defending the importance of forming autonomous teachers that they look for to understand the context in that they act, for that movement to make possible educational interventions with better conditions of the students' learning. In the extent of the teachers' formation, it has been discussed the importance of formative actions that they have as focus the analysis of the needs in the educational formation, as alternative to turn such more significant actions. Concerned with those subjects and with the school failure in the Brazilian education, especially in the children's of the public school literacy, we accomplished this work that aims at to investigate the needs of teachers' of the Fundamental Teaching of the public school formation, in the extent of their students' orthographic difficulties, building with those teachers knowledge on the process of teaching/learning spelling. The study was accomplished at a municipal school of the city of Parnamirim-RN, that offers the Fundamental Teaching I. the approach investigativa is of qualitative nature, where the case study and the research-action were used as methodologies. They participated in the research 7 teachers and 1 coordinator of the institution. For the construction of the data the following instruments were used: glimpsed semi-directing collective and individual, documental analysis, questionnaire and observation, that made possible the triangulation of the data for the content analysis. The main results pointed that the teachers' of that school initial needs were addressed not only to the teaching of the spelling, but also to the formation type that they would receive. We verified although the formative process was favorecedor of sockets of the teachers' conscience: related to the orthographic mistakes, to the strategies used at classroom and to the planning addressed to the teaching of the spelling. Finally, we concluded that the teachers' reflection researched about their own formation needs contributed for (trans)formations of their conceptions and practices related to the teaching of the spelling, even before some found difficulties, so much in the formation as in practice pedagogic developed by the participants

Lagoa do Piató: a educação como uma obra de arte

A partir de una concepción de la educación como una obra de arte, la disertación revela los estudios realizados en una escuela de la comunidad de Areia Branca Piató, en la Laguna de Piató en Assú, Estado de Rio Grande do Norte. Como una forma de hacer dialogar conocimientos científicos y saberes tradicionales, la investigación establece el intercambio de saberes y afectos sobre todo por intermedio del intelectual de la tradición Francisco Lucas da Silva. Para construir un conocimiento pertinente (Edgar Morin), el que forma parte de un contexto, buscamos aquí la comprensión de una pedagogía viva e imaginativa. La disertación encontró en la Laguna un laboratorio vivo para pensar en una enseñanza educativa y para ejercer el pensamiento complejo. A partir de estudios e investigaciones anteriores, pude organizar lo que considero que se constituye como constelaciones de saberes que permiten dar continuidad a ese eje de investigación que empezó desde 1986 en el Grupo de Estudios de la Complejidad GRECOM. En la construcción de este trabajo, pude aprender valores que creo que son importantes para una educación compleja: la humildad delante de la vida; la abertura para diferentes lenguajes del mundo; el diálogo con la naturaleza; la apuesta en nuestras creencias; el sueño de resignificar a la realidad a partir del lazo entre la profundidad de nuestro ser y el mundo; el uso pleno de nuestras potencialidades imaginativas y creativas; y, finalmente, la vivencia intensa de los sentidos. Partiendo de ese aprendizaje, la investigación teórico‐práctica tuvo como elemento central el desarrollo de talleres sobre el tema del agua con alumnos de la enseñanza básicas de diversas series, y con la participación activa de dos profesoras de la comunidad de Areia Branca Piató. Fueron llevadas adelante experiencias que contemplaron una visión sistémica de la naturaleza, las fotografías, los atelieres, las clases de campo, el arte de educar, la narración de historias y sobre todo las enseñanzas del intelectual de la tradición Francisco Lucas da Silva

A leitura de literatura na escola: por uma educação emocional de crianças na educação infantil

This dissertation examines the contributions of juvenile literature reading for the problematization of the emotional experiences and conflicts of children at infant education. Its importance consists in providing useful information for the pedagogic work orientated to literature reading at the initial series of basic education, in order to increase the teacher s ability to explore the literary text from its instigating and enriching nature in view of the child s emotional experiences and conflicts. It is methodologically based on the principles of the qualitative research, what characterizes it as a case study. The research focused a level V-infant education class with 28 students in 5-6 age group, at a public school of Natal, State of Rio Grande do Norte (Brazil). The used resources were: audio recording, field diary, and interviews. Seventeen classes were carried out and they consisted in reading sessions of classic and contemporaneous tales, fables, and legends which used different didactic strategies. These sessions were developed in accordance with the reading experience through scaffolding instructions as it was described by Graves & Graves. The theoretical references were the studies of Amarilha (1997/ 2006), Bettelheim (2004), Coelho (1987/2000), Damásio (2005), Del Nero (2003), Eco (1994/2006), Held (1980), Iser (1996), Jauss (2002), Stierle (2002), Wallon (2007), Telles (2006), Yunes (2003), and Zilberman (1987). The analyses showed that literary reading in class is a special environment for inclusion of the reader s subjectivity; as well as the inclusion of their emotional experiences and their conflicts within the story by way of helping children think and become suitable for dealing with their inner feelings. The literary reading is presented as an experiential and formative activity which helps children understand their emotions through a process of identification, exteriorization, and catharsis; what implies that the esthetic experience from the text makes possible the reader s self-knowledge and increases the perception of his inner feelings and objective reality so that this reader has emotional capital to deal with life difficulties. It is important to highlight that the discussions carried out in the class represented a field of sharing experiences through which each reader had the chance to present their experience of life to the others, including their sorrows and sufferings, in order to help them to develop best strategies to deal with the social environment

Avaliação, identificação e atividade enzimática de bactérias psicotróficas presentes no leite cru refrigerado

Extended storage of refrigerated milk can lead to reduced quality of raw and processed milk, which is a consequence of the growth and metabolic activities of psychrotrophic bacteria, able to grow under 7oC or lower temperatures. Although most of these microorganisms are destroyed by heat treatment, some have the potential to produce termoresistant proteolytic and lipolytic enzymes that can survive even UHT processing and reduce the processed products quality. Recently, the IN 51 determineds that milk should be refrigerated and stored at the farm what increased the importance of this group of microorganisms. In this work, psychrotrophic bacteria were isolated from 20 communitarian bulk tanks and 23 individual bulk tanks from dairy farms located at Zona da Mata region of Minas Gerais State and from southeastern Rio de Janeiro. Selected milk dilutions were plated on standard agar and after incubation for 10 days at 7oC, five colonies were isolated, firstly using nutrient agar and after using McConkey agar for 24 hours at 21oC. The isolates were identified by morphology, Gram stain method, catalase production, fermentative/oxidative metabolism and by API 20E, API 20NE, API Staph, API Coryne or API 50 CH (BioMerieux). In order to ensure reproductibility, API was repeated for 50% of the isolates. Species identification was considered when APILAB indexes reached 75% or higher. 309 strains were isolated, 250 Gram negative and 59 Gram positive. 250 Gram negative isolates were identified as: Acinetobacter spp. (39), Aeromonas spp. (07), A. Hydrophila (16), A. sobria (1), A. caviae (1), Alcaligenes feacalis (1), Burkholderia cepacia (12), Chryseomonas luteola (3), Enterobacter sp. (1), Ewingella americana(6), Hafnia alvei (7), Klebsiella sp. (1), Klebsiella oxytoca (10), Yersinia spp. (2), Methylobacterium mesophilicum (1), Moraxella spp. (4), Pantoea spp. (16), Pasteurella sp. (1), Pseudomonas spp. (10), P. fluorescens (94), P. putida (3), Serratia spp. (3), Sphigomonas paucomobilis (1). Five isolates kept unidentified. Pseudomonas was the predominant bacteria found (43%) and P. fluorescens the predominant species (37.6%), in accordance with previous reports. Qualitative analysis of proteolytic and lipolytic activity was based on halo formation using caseinate agar and tributirina agar during 72 hours at 21oC and during 10 days at 4°C, 10oC and 7°C. Among 250 Gram negative bacteria found, 104 were identified as Pseudomonas spp. and 60,57% of this group showed proteolytic and lipolytic acitivities over all four studied temperatures. 20% of Acinetobacter, Aeromonas, Alcaligenes, Burkholderia, Chryseomonas, Methylobacterium, Moraxella presented only lipolytic activity. Some isolates presented enzymatic activity in one or more studied temperatures. Among Gram positive bacteria, 30.51% were proteolytic and lipolytic at 10oC, 8.47% were proteolytic at 7oC, 10oC, and 21oC, 8.47% were proteolytic at all studied temperatures (4oC, 7oC, 10oC and 21oC) and 3.38% were proteolytic only at 21oC. At 4oC, only one isolate showed proteolytic activity and six isolates were lipolytic. In relation to Gram negative microorganisms, 4% were proteolytic and lipolytic at 7oC, 10oC and 21oC, 10% were proteolytic at 10oC and 4.4% were lipolytic at 4oC, 7oC, 10oC and 21oC, while 6.4% of all isolates were proteolytic and lipolytic at 10oC and 21oC as well as lipolytic at 4oC and 7oC. These findings are in accordance with previous researches that pointed out Pseudomonas as the predominant psycrotrophic flora in stored refrigerated raw milk

Desenvolvimento de sorvete probiótico a base de leite de cabra: estudo da formulação, características físico químicas, sensoriais e viabilidade das bactérias probióticas

This work targetet the caprine ice cream production added with probiotic bacteria Bifidobacterium animalis subsp. lactis. It is divided into two parts. In the first one, four caprine ice cream formulations were evaluated, in which it was used hydrogenated fat (F1 and F3) or fat substitute (F2 and F4) in two different flavors (F1 and F2, passion fruit, F3 and F4, guava). Statistical differences (p<0.05) were detected for their physical-chemical properties, mainly for total solids and fat, but no differences were observed for melting test results. When it went to sensory acceptance, all four ice cream formulations reached high acceptance indexes, mostly formulation F4, which was selected for further studies. In the second part, F4 formulation was prepared with the addition of probiotic bacteria Bifidobacterium animalis subsp. lactis. The growth kinetics was studied and it was observed that the cellular concentration peak was reached after four fermentation hours (10.14 log UFC/g). This time was selected for pre-fermentation procedure and posterior addition at ice cream syrup. In this part of the study, two experimental groups were evaluated: group G1, in which the probiotic addition occurred before the maturation step and group G2, which included a pre-fermentation step and probiotic addition after ice cream maturation. The physical-chemical properties of these two ice cream groups were similar, except for pH, which was higher for group G2 (p<0.05). G1 samples had superior melting rate (3.566 mL/min) and both groups presented microbiological and sanitary results in accordance to current Brazilian legislation. Also, G1 and G2 were considered sensory accepted due to their acceptance indexes higher than 70%. G1 and G2 sensory profiles were similar (p>0.05), and both ice cream samples exhibited high creaminess (6.76 to 6.91) and mouth melting sensation (6.53 to 6.67) scores, while low sandiness scores (0.85 to 0.86) were observed, positive characteristics for this kind of food product. During the first 24 hours after ice cream production, the population of B. animalis subsp. lactis decreased, reaching 7.15 e 6.92 log CFU/g for G1 and G2, respectively. Probiotic bacteria counts fluctuated in ice cream samples during the first 108 days at frozen storage, especially for G2 group. Decreased probiotic viability was observed for G1 samples during the first 35 days of frozen storage, mild variation between 35 and 63 days and stabilized counts were observed after this time. After 21 days at frozen storage, ice cream samples of G1 and G2 groups reached 1.2 x 109 and 1.3 x 109 CFU/portion, respectively. After 108 days under these storage conditions, the survival rate of B. animalis subsp. lactis was 94.26% and 81.10% for G1 and G2 samples, respectively. After simulation of gastroenteric conditions, G2 group reached 9.72 x 105 CFU/portion. Considering the current requirements of Brazilian legislation, which stipulates that functional foods must have minimum probiotic count between 108 and 109 CFU/portion and detectable probiotic bacteria after being submitted to gastroenteric conditions, it is concluded that the ice cream with the addition of Bifidobacterium animalis subsp. lactis made as shown in this work, can be considered as a dairy functional food

Amor como medida de satisfação marital

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior

Percepção de estigma e qualidade de vida em crianças com neoplasia

The increase in survival time and cure requires more extensive care about the quality of life of cancer patients, which begins soon after diagnosis. Thus, it seems reasonable to the emphasis on development of studies covering the psychosocial variables, such as stigma, treatment of childhood cancer aiming thereby to the attention of the overall needs of the child. Thus, this research aims to investigate the perception of stigma and quality of life in children with cancer. This is a cross-sectional research and understanding of the descriptive type, the type specimen being adopted for convenience. This consisted of thirty children with cancer and thirty children without chronic disease. The instruments used were the Quality of Life Questionnaire, the Perceived Stigma Scale and Technical Drawing Story with a Theme. The results indicate that the chronic condition, no interfered significantly in satisfaction with the quality of life in children with cancer and identified that the quality of life is not related to the stigma. Comparison with children with no chronic disease with infants with cancer, no significant differences were observed. However, the group mean contrast was lower, suggesting a greater impairment in quality of life of children with cancer compared to those without chronic disease. It is worth noting that the psychosocial effects and the limitations imposed by disease and treatment are presented as important factors in the design mode of subjective manifestations of children with cancer. Therefore, it is expected that knowledge elucidated by this study will assist, greatly to the promotion of improved emotional, biological and social development itself and the involvement of children with cancer treatment

Síntese e caracterização de ferritas de níquel dopadas com cobalto e efeito da substituição nas suas propriedades magnéticas

The ferrite composition Ni1 - xCoxFe2O4 (0 ≤ x ≤ 0.75) were obtained by the method of microwave assisted synthesis and had their structural and magnetic properties evaluated due to the effect of the substitution of Ni by Co. The compounds were prepared: according to the concept of chemical propellants and heated in the microwave oven with power 7000kw. The synthesized material was characterized by absorption spectroscopy in the infrared (FTIR), Xray diffraction (XRD) using the Rietveld refinement, specific surface area (BET) , scanning electron microscopy (SEM) with aid of energy dispersive analysis (EDS) and magnetic measurements (MAV). The results obtained from these techniques confirmed the feasibility of the method of synthesis employed to obtain the desired spinel structure, the ferrite, nickel ferrite as for nickel doped with cobalt. The results from XRD refinement ally showed the formation of secondary phases concerning stages α - Fe2O3, FeO, (FeCo)O e Ni0. On the other hand, there is an increase in crystallite size with the increase of cobalt in systems, resulting in an increased crystallinity. The results showed that the BET systems showed a reduction in specific surface area with the increase of cobalt and from the SEM, the formation of irregular porous blocks and that the concentration of cobalt decreased the agglomerative state of the system. The magnetic ferrites studied showed different characteristics according to the amount of dopant used, ranging from a very soft magnetic material (easy magnetization and demagnetization ) - for the system without cobalt - a magnetic material with a little stiffer behavior - for systems containing cobalt. The values of the coercive field increased with the increasing growth of cobalt, and the values of saturation magnetization and remanence increased up to x = 0,25 and then reduced. The different magnetic characteristics presented by the systems according to the amount of dopant used, allows the use of these materials as intermediates magnetic

LWiSSy: uma linguagem específica de domínio para modelagem de sistemas de redes de sensores e atuadores sem fio

The field of Wireless Sensor and Actuator Networks (WSAN) is fast increasing and has attracted the interest of both the research community and the industry because of several factors, such as the applicability of such networks in different application domains (aviation, civil engineering, medicine, and others). Moreover, advances in wireless communication and the reduction of hardware components size also contributed for a fast spread of these networks. However, there are still several challenges and open issues that need to be tackled in order to achieve the full potential of WSAN usage. The development of WSAN systems is one of the most relevant of these challenges considering the number of variables involved in this process. Currently, a broad range of WSAN platforms and low level programming languages are available to build WSAN systems. Thus, developers need to deal with details of different sensor platforms and low-level programming abstractions of sensor operational systems on one hand, and they also need to have specific (high level) knowledge about the distinct application domains, on the other hand. Therefore, in order to decouple the handling of these two different levels of knowledge, making easier the development process of WSAN systems, we propose LWiSSy (Domain Language for Wireless Sensor and Actuator Networks Systems), a domain specific language (DSL) for WSAN. The use of DSLs raises the abstraction level during the programming of systems and modularizes the system building in several steps. Thus, LWiSSy allows the domain experts to directly contribute in the development of WSANs without having knowledge on low level sensor platforms, and network experts to program sensor nodes to meet application requirements without having specific knowledge on the application domain. Additionally, LWiSSy enables the system decomposition in different levels of abstraction according to structural and behavioral features and granularities (network, node group and single node level programming)

Tessituras poéticas da corporeidade na formação humana do educador infantil

Cette étude a comme sujet principal la formation humaine de l instituteur. L objectif général est d analyser et décrire les conditions créées par les vécus d un atelier corps biographique pour la resignification de la corporéité de l instituteur, fixant les questions suivantes pour l investigation : Quelles sont les implications du vécu de l atelier corps biographique dans la vie des instituteurs ? La recherche a été exposée sur l approche qualitative, suivant les principes de la recherche-action reliée à la méthode des histoires de vie. Pour révéler la beauté et la complexité du processus poïétique de la formation humaine, nous nous sommes servi de la métaphore du "dessus de lit en patchwork" comme opérateur cognitif en attachant les principes de la corporéité fondés sur la Théorie de la complexité (MORIN, 2005), la Théorie autopoïétique (MATURANA ; VARELA, 2001), la Théorie du flux (CSIKSZENTMIHALYI, 1999), les approches de transdisciplinarité (LA TORRE; MORAES, 2008), et d autobiographie (JOSSO, 2004; PINEAU, 2003; PASSEGGI, 2000;), joignant la conception de l éducation comme pratique d autonomie, de liberté, d espoir et de l enchantement (FREIRE, 1996, 1992; ASSMANN, 1995). Nous avons eu comme scène du développement de la recherche, l Unidade Educacional Infantil (UEI), la garderie qui accueille les enfants des fonctionnaires de l Université Fédérale du Rio Grande do Norte. Treise élèves (enfants), des institutrices titulaires, vacataires, boursières ont participé de l'investigation. En conptant sur eux, nous avons développé un atelier corps biographique, dans lequel nous avons réalisé 10 vécus dans la période qui a couvert le deuxième semestre de 2007 jusqu au deuxième semestre de 2008, en manifestant la réflexivité autobiographique, le ludique, la créativité, la sensibilité et la réflexivité du vécu. Nous avons utilisé comme instruments pour la construction des donnés, l observation participante, les propres vécus, le port folio, la technique du jeu de sable et l'enregistrement photographique. L analyse a montré que le vécu de la formation humaine à partir des principes de la corporéité, implique dans un parcours vers soi-même dans lequel émergent les expériences qui nous ont constitués en tant qu êtres existentiels. Pour finaliser, nous avons aperçu les répercussions dans la vie professionnelle et personnelle de ces institutrices, qui comme moi pensaient avoir besoin d exposer leur luminosité intérieure pour que l on la redécouvre. Lors des vécus des tissages, les institutrices se sont montrées impliquées aux moments de jeux, de création, de réalisation, d afection et d action réflexive, dans lesquelles la teneur humaine cachée, a été révélée, en ouvrant les possibilités pour le sentiment du mouvement de naissance de l humanisation intérieure. Pour conclure, le corps joyeux de savoir et de beauté a été révélé, et dans sa rencontre avec soi-même et avec l autre, a pu être auto- recréé

Utilizando comitês de classificadores para predição de rendimento escolar

Educational Data Mining is an application domain in artificial intelligence area that has been extensively explored nowadays. Technological advances and in particular, the increasing use of virtual learning environments have allowed the generation of considerable amounts of data to be investigated. Among the activities to be treated in this context exists the prediction of school performance of the students, which can be accomplished through the use of machine learning techniques. Such techniques may be used for student’s classification in predefined labels. One of the strategies to apply these techniques consists in their combination to design multi-classifier systems, which efficiency can be proven by results achieved in other studies conducted in several areas, such as medicine, commerce and biometrics. The data used in the experiments were obtained from the interactions between students in one of the most used virtual learning environments called Moodle. In this context, this paper presents the results of several experiments that include the use of specific multi-classifier systems systems, called ensembles, aiming to reach better results in school performance prediction that is, searching for highest accuracy percentage in the student’s classification. Therefore, this paper presents a significant exploration of educational data and it shows analyzes of relevant results about these experiments.