Efeitos da compactação em algumas propriedades físicas do solo e seu reflexo no desenvolvimento das raízes de plantas de soja

Estudou-se o efeito de vários níveis de compactação na densidade do solo, porosidade total e resistência à penetração, objetivando determinar o nível que impede o desenvolvimento das raízes de plantas de soja. O trabalho foi realizado em casa de vegetação, com amostras deformadas do horizonte superficial de uma terra roxa estruturada e de um latossolo roxo, controlando os níveis de compactação e o teor de água. A influência da compactação no desenvolvimento das raízes foi avaliada um mês após a germinação. Os valores de densidade do solo, para um mesmo nível de compactação, foram maiores para a terra roxa estruturada. O teor de água ótimo para a compactação foi de 21,0% para a terra roxa estruturada e de 29,8 para o latossolo roxo. A compactação artificial do solo acarretou aumento da resistência à penetração e diminuição da porosidade total. A elevação da sua densidade de 0,90 para 1,30 kg/m³ para a terra roxa estruturada, e de 0,90 para 1,23 kg/m³ para o latossolo roxo, promoveu, respectivamente, diminuição de 39 e de 41% na massa seca das raízes. O desenvolvimento das raízes das plantas ficou impedido quando a densidade do solo atingiu valores de 1,30 e 1,23 kg/m³, respectivamente, para a terra roxa estruturada e o latossolo roxo.

Análise teórico-experimental do coeficiente de perfomance (COP) de um sistema de refrigeração por jato-compressão

The use of waste heat of energy conversion equipment to produce a cooling effect, consists currently in a very interesting way of efficiency improvement of energy systems. The present research has as intention the theoretical and experimental study of a new intermittent refrigeration system ejector cycle characteristics, with use of waste heat. Initially, was doing a bibliographical survey about the vapor ejector refrigeration system technology. In the following stage was doing a simulation of the corresponding thermodynamic cycle, with preliminarily intention to evaluate the performance of the system for different refrigerants fluids. On the basis of the results of the simulation were selected the refrigerant fluid and developed an experimental group of benches of the refrigeration system considered, where pressure and temperature sensory had been inserted in strategical points of the refrigeration archetype and connected to a computerized data acquisition system for measure the refrigerant fluid properties in the thermodynamic cycle. The test results obtained show good agreement with the literature

Número mínimo de colheitas em pepino híbrido estimado por meio do coeficiente de repetibilidade

O objetivo deste trabalho foi estimar o número mínimo de colheitas em experimento com a cultura do pepino. Foram analisados dados de um experimento onde avaliaram-se 14 híbridos de pepino japonês, no delineamento em blocos ao acaso, com quatro repetições e cinco plantas por parcela, conduzidas sob ambiente protegido. Foram efetuadas 32 colheitas, três colheitas por semana, por um período de 72 dias e estimados os coeficientes de repetibilidade, com base na análise de componentes principais para os caracteres produção de frutos por planta, em massa e número, total e comercial. Os resultados permitiram concluir que menos de nove colheitas foram suficientes para analisar as diferenças de produtividade entre os diferentes híbridos, com 95% de certeza de serem eleitos os mais produtivos.

Coeficiente do tanque Classe A obtido por diferentes métodos em ambiente protegido e no campo

There are several methods for determining the Class-A pan coefficient (Kp) to estimate the reference evapotranspiration (ETo), which is of great importance to water management in agriculture. Most of these methods take into account the wind speed, relative humidity and the fetch area. This study was done in region of Botucatu, SP, in greenhouse and field in the months of July-August (dry) and September-October (rainy), used the methods of Doorenbos e Pruitt (1977), Cuenca (1989), Snyder (1992), Pereira et al. (1995), Allen et al. (1998) and correlation between ETo determined by Penman-Monteith (EToPM) and evaporation of the Class-A pan (ECA). The EToPM was used as standard for the correlations between the ETo determined by the Class-A pan (EToTCA) obtained by different methods of Kp. The Kp in greenhouse ranged between 0.51 and 0.85, and in the field from 0.33 to 0.85. The methods of Allen et al. (1998) and Snyder (1992) are the most recommended for dry months in greenhouse and rainy months the correlation between the ECA and EToPM e Cuenca (1989). In the field condition, the methods of Allen et al. (1998) and of correlation between the ECA and EToPM for dry months, and for rainy months of Allen et al. (1998) and Cuenca (1989). The method of Allen et al. (1998) was the most efficient, regardless of the environment and of months analyzed. The fixed value of Kp should only be used when it is not possible to determine from its more sophisticated methods.

O ambiente virtual na formação inicial de professores de alemão como apoio para o ensino e a aprendizagem da língua e a reflexão sobre ações docentes

Estudiosos dos campos da Educação, da Linguística Aplicada e da Formação de Professores de Línguas insistem hoje na grande importância da inclusão de Tecnologias de Informação e Comunicação (TICs) na formação inicial, bem como na necessidade de promover o desenvolvimento do pensamento crítico-reflexivo dos futuros professores. Tomando como pressupostos teóricos estudos acerca das características da sociedade de informação, dos ambientes virtuais e da formação de professores, este trabalho tem como objetivo discutir possibilidades oferecidas pela plataforma Moodle de aprendizagem na formação inicial de professores de alemão. Para tanto, apresentaremos diferentes formas de uso de ambientes virtuais e de ferramentas neles disponíveis, que demonstraram ser de grande valor no processo de formação de licenciandos, tanto em língua alemã, quanto durante suas práticas iniciais. As experiências apontam para um valor inestimável de ambientes virtuais no acompanhamento de licenciandos no processo de aprendizagem da língua e nas primeiras experiências com a docência.

Determinação do coeficiente de decaimento bacteriano em wetland - alagado construído

Wetlands systems are considered nowadays as a treatment method that uses simple, easy operation and low cost technology, which has been used in various parts of the world and also in Brazil. Used alone or as a complement to other types of treatment systems, once it effectively removes nutrients, pathogens and other pollutants in the water. Due to the high complexity found in wetlands, making it difficult to predict the response of the system to treat wastewater, one should consider as ideal to base the sizing of the wetland system over the necessary removal of this parameter instead of scaling it from empiricism. The study was conducted to determine the coefficient of bacterial decrease in the Wetland unit located at Ponta Negra Station Sewage Treatment, located in Natal, the coastal region of Rio Grande do Norte. The most representative model to determine the bacterial decrease in this system was the one from Chick for hydraulic piston system. Kb of 0.37 d-1 were found for the flow rate of 15m³/d, while for the system operating at maximum design flow, 30m³/d, the Kb of 0.98 d-1 was found

A linguagem da reflexão de uma professora de Língua Inglesa: um estudo de caso sob a perspectiva do sistema de avaliatividade

Research about teacher education, carried out in the area of Applied Linguistics (AL), reveals the importance of reflective practices in the professional development of teachers. With the aim of contributing to this area, we present this case study conducted at a technical school in Natal, RN. The corpus of the study is formed mainly from the teacher‟s discourse, generated during a stimulated recall session and the instruments used to collect the data: an initial questionnaire, a video recording of a class and the text transcript of the stimulated recall session. The central objective is to understand the way in which the reflection-on-action (SCHÖN, 1983, 1987) can contribute to raise the awareness of an English as a Foreign Language teacher (EFL) about her actions in the classroom. With this proposal, we begin our discussion presenting the origins, the presuppositions and characteristics of the concept of reflection according to Schön (1983, 1987), and supported by other authors (PERRENOUD, 2002; GÓMEZ, 1995; IMBERNÓN, 2009, among others); of critical reflection (LISTON e ZEICHNER, 1993; PIMENTA, 2002; DUTRA e MELLO, 2004, among others); and of the process of critical reflection (SMYTH, 1992). To evidence the reflections that emerge in the teacher‟s discourse, we found support in the theories and methods of Systemic Functional Grammar (SFG), which was initially proposed by Halliday (1985, 1994), Halliday and Hasan (1989), Halliday and Matthiessen (2004) and followers, such as, Eggins (1994), Thompson (1996), among others. We focus mainly on the subsystem of Attitude, an integral component of the system of discourse resources, Appraisal, presented by Martin (2000), Martin and Rose (2003, 2007), Martin and White (2005). The results reveal that the actions of the teacher in the classroom reflect not only her professional experiences, but also her values and concepts about teaching/learning languages. The results also show the teacher‟s awareness of the need for changes in her practices. Faced with these findings, we believe that this study reveals important concepts that can direct teacher educators to rethink new ways of approaching teacher training courses. In addition, it also reveals the importance of discourse analysis based on a systemic functional approach.

Autoria e escrita: uma reflexão acerca do autorar em memórias de leituras de alunos de 9º ano do ensino fundamental

This paper presents results concerning studies conducted during the master's research in the area of Applied Linguistics of the Graduate Program in Language Studies - PPgEL, linked to the Federal University of Rio Grande do Norte. We approached this study the question of authorship, which has gained ground increasingly important in academic research, because the act of authoring, in view of the amount of circulating discourses socially, becomes increasingly questionable. We understand authorship as related to a positioning of the subject than to take responsibility, in the Bakhtinian sense, by its text, it makes their views, ideologies, beliefs and values, from ownership and restructuring of the speech of others. This research is methodologically inserted in a qualitative, interpretive in nature and has a corpus analysis of the ten productions written memoir genre of readings produced by students in 9th grade in elementary school. Research aimed to analyze the students' written productions held in the school environment, to identify these texts marks or evidence of authorship and investigate how the restructuring of ownership and voices of others in the process of authoring. We adopt a concept of language from bakhitinianas concepts and understand the text in a vision Geraldiana. The analyzes in this study showed that in most texts there is the strong presence of voices of others, either implicitly and/or explicit. That is, students, to build their sayings, if embraced the voices of others in various formats, in particular styles, namely, by what Bakhtin names as linear style and pictorial style. Some proved his statement highlighting their positions through direct quotes from authors of books, family, teachers, showing us that their voices are filled with voices of others with whom they approve, deny, analyze, think and reflect. We therefore conclude that students were constituted as subjects of their texts, authors, since they leave marked the voices of others so presentified and restructured voices of others who do not actually sounded like voices of others, but as present voices from a discursive restructuring producer

Comportamento elétrico a alta temperatura de termistor cerâmico alfa-Fe2O3 com coeficiente de temperatura negativo

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Pesquisas sobre a febre amarela (1881-1903): uma reflexão visando contribuir para o ensino de ciências

O presente artigo focaliza episódios históricos relacionados à pesquisa médica acerca da febre amarela (1881-1903), buscando discutir (a) a influência que os fatores econômicos, sociais e políticos exercem sobre a pesquisa científica; (b) o caráter coletivo, controvertido e não-linear do processo de produção de conhecimentos na ciência; (c) a natureza arbitrária dos conhecimentos científicos, no sentido de que representam formas de ver, e não são perenes ou elaborados apenas sobre bases racionais; (d) o papel pouco cabal desempenhado pelas demonstrações experimentais, que não se mostram irrefutáveis; e (e) o papel desempenhado pelos paradigmas, que conduzem não apenas a caminhos frutíferos, mas também a becos sem saída. O intuito é proporcionar subsídios que sejam úteis tanto aos pesquisadores como aos professores que atuam na área do Ensino de Ciências.

A formação graduada em psicologia no Brasil: reflexão sobre os principais dilemas em um contexto pos-DCN

Criticism done to the undergraduate training process of the psychologist in Brazil raised debates known as "dilemmas of training". In recent years the classic training model, based on the Minimum Curriculum has undergone a series of changes after the National Curriculum Guidelines (DCN), modifying the context of courses. Thus, this paper aimed to investigate, in a post- DCN context how undergraduate courses in Psychology in Brazil have been dealing with the dilemmas of training. So, we decided to analyze the Course Pedagogical Projects (CPPs) of Psychology in the country. Forty CPPs, selected by region, academic organization and legal status were collected. The data was grouped into three blocks of discussions: theoretical, philosophical and pedagogical foundations; curriculum emphases and disciplines; and professional practices. The results were grouped into four sets of dilemmas: a) ethical and political; b) theoreticalepistemological; c) professional practice of the psychologist and d) academic-scientific. Courses claim a socially committed, generalist, pluralistic training, focusing on research, non-dissociation of teaching-research-extension, interdisciplinary training and defending a vision of man and of critical and reflective and non-individualistic psychology. The curriculum keeps the almost exclusive teaching of the classical areas of traditional fields of applied Psychology. Training is content based. The clinic is hegemonic, both in theory and in application fields. The historical debate is scarce and themes linked to the Brazilian reality are missing, despite having social policies present in the curricula. Currently, DCNs have a much greater impact on courses due to the influence of the control agencies, fruit of current educational policy, and the result is felt in the homogenization of curriculum discourses

Comunidade fitoplanctônica como discriminador ambiental em açude eutrófico tropical semiárido (Barragem Armando Ribeiro Gonçalves, RN) e divulgação científica para reflexão social

The knowledge of the phytoplankton community, as an integral and dynamic processes of eutrophication, provides information essential for proper management and handling. A growing problem of cyanobacteria in reservoirs around the world as a result of artificial eutrophication processes, generating a particular concern, because some species produce cyanotoxins, which can cause adverse effects on human health. The present work aims to characterize the spatial and temporal dynamics of phytoplankton, assessing their potential as ecological indicator of water quality in reservoirs semiarid region. The samples of water were collected monthly between 2009 and 2011, at three points along the dam Armando Ribeiro Gonçalves / RN. In each sample were measured physico - chemical analysis of water and biological components. We conducted a scientific dissemination activity, with distribution and reading primer on eutrophication, informative talk about water quality, questionnaires and performing a play in a public school in the city of Itajá / RN. The reservoir was considered eutrophic in three points, taking into account the values of chlorophyll -a and phosphorus, adopted to characterize eutrophic environments of semi-arid areas. High density of cyanobacteria, with a maximum value of 2.227.862 cél.ml- 1 and minimum of 43.456 cél.ml- 1 was recorded in lentic and semilêntico points throughout the study, exceeding the levels of drinking water (20.000 cél.ml- 1) established in 2.914/2011 Ordinance of the Ministry of Health of Brazil. All samples contained microcystin, and 44 % had values superiores1μg L- 1. The thermal pattern of the water column showed micro stratifications with differences of less than 1 ° C from five feet deep. The distribution pattern was the type profile clinogrado with oxygen deficit in the bottom of the reservoir. Oxiclina from 10 meters depth was observed during the rainy season (May-June) in the two years of study. The phytoplankton community was represented by 10 functional groups: S1, M, H1, Lo, P, F, Sn, P, W2 and R. The assessment of the ecological status of the system by the index Q showed poor water quality. The results of the study show that the vertical variations were less pronounced than the seasonal variations of cyanobacteria and phytoplankton community in general in the reservoir. The presence of cyanotoxins confirms the need for the monitoring of water quality and measures to reduce eutrophication in water supply reservoirs semiarid RN and demonstrates the challenge for water managers and health authorities to ensure water quality and consequently minimize risks to human health. Compared to the lecture, the primer was considered more efficient in sensitizing the participants, featuring a dynamic practice, differentiated learning, create opportunities for students to rethink attitudes of respect and care for the environment, and shall have the opportunity to learn the subject content from your reality and living environment. The knowledge generated from the activity of scientific were seen as essential for raising awareness of some of the region`s environmental problems , such as eutrophication

Implantação do exame do reflexo vermelho em crianças da região do Hospital das Clínicas da Faculdade de Medicina de Botucatu - SP - Brasil

Purpose: To describe the implantation of the red reflex test in 30 cities in the area of Botucatu Medical School Clinical Hospital, (480,337 inhabitants) and the creation of a reference Center for children with red reflex changes, the Red reflex screening and another Center for treatment of childhood cataract.Methods: The red reflex exam was released in 30 cities of the surrounding Botucatu area, lectures were done in the cities invited to participate by the Regional Department of Health. 109 pen torch ophthalmoscopes were distributed to the hospital maternities and primary care units. The Red reflex screening attended cases of altered or doubtful red reflex and established the diagnosis. The Center for treatment of childhood cataract performed the preoperative examination, surgical treatment and follow-up of children with cataracts.Results: After one year the Red reflex screening attended 29 children, 17 males and 12 females, mean age and pattern deviation (PD) of 10.09 +/- 20.35 months (7 days - 98 months old). 16 patients were referred with altered red reflex, with a mean age and pattern deviation of 13.17 +/- 24.14 months (7 days - 98 months old). The alteration was confirmed in all of these cases. 13 children had cataract. In 13 children with doubtful exam, with a mean age and PD of 6.29 +/- 14.46 months (7 days - 54 months old), the alteration was not confirmed in any of these patients. The incidence of negative red reflex found among newborns was 9.2/10,000 and the incidence cataracts in this same group was 7.9/10,000.Conclusion: We described the implantation of the red reflex exam in the Botucatu area, and the creation of a reference Center for eye examination of children with changes in the red reflex, and the creation of a reference Center for treatment of childhood cataract and difficulties.

Espaço geográfico, produção e movimento: uma reflexão sobre o conceito de circuito espacial produtivo

O propósito deste artigo é demonstrar a importância e a operacionalidade dos conceitos de circuito espacial produtivo e círculos de cooperação no espaço, num momento histórico em que as esferas da produção e da troca tornam-se geograficamente mais dispersas, fazendo da circulação uma prioridade e um campo de atuação estratégica de Estados e empresas. Procura-se alcançar esse objetivo em três passos: 1) elaboração de uma discussão teórica com base nos autores que propuseram e procuraram desenvolver os conceitos; 2) proposição de uma distinção entre circuito espacial produtivo e cadeia produtiva; 3) uma breve análise da produção agrícola moderna em áreas de fronteira agrícola no território brasileiro à luz dessa teoria.