Effects of artificial substrate and night-time aeration on the water quality in Macrobrachium amazonicum (Heller 1862) pond culture

The effects of artificial substrate and night-time aeration on the culture of Macrobrachium amazonicum were evaluated in 12 ponds stocked with 45 prawns m-2. A completely randomized design in 2 × 2 factorial scheme with three replicates was used. The combination of factors resulted in four treatments: with substrate and aeration (SA), with substrate and without aeration (SWA), without substrate and with aeration (WSA) and without substrate and aeration (WSWA). The presence of substrate in SA and SWA treatments reduced suspended particles (seston) by ~17.3% and P-orthophosphate by ~50%. The use of aerator (WSA and SA treatments) significantly (P < 0.05) increased the concentration of dissolved oxygen, suspended particles and nutrients in the pond water. These results indicate that the effect of substrate on turbidity and total suspended solids (TSS) values is opposite to the effect of the aerator. The aerators in semi-intensive grow-out M. amazonicum farming lower water quality because they increased the amount of detritus and nutrients in the pond water. On the other hand, the use of artificial substrate reduces turbidity values, chlorophyll a, TSS and P-orthophosphate concentrations. Therefore, the combination of substrate addition and night-time aeration is not interesting because they have opposite effects. © 2013 John Wiley & Sons Ltd.

Quality of performance of the operation of sugarcane mechanized planting in day and night shifts

The sugarcane mechanized planting is becoming increasingly widespread in Brazil due to a higher operability and better working conditions offered to workers compared to other types of planting. Studies related to this topic are insufficient or scarce in Brazil. In this context, the aim of this study was to evaluate the operation quality of sugarcane mechanized planting in two operation shifts, by means of statistical process control. The mechanized planting was held on March 2012 and statistical design was completely randomized with two treatments, totaling 40 replications for the day shift and 40 replications for the night shift. The variables evaluated were: speed, engine rotation, engine oil pressure, water temperature of the engine, effective field capacity and the time consumption hourly and effective fuel. The use of statistical control charts showed that random intrinsic do not cause this process. The tractor alignment error showed outliers in the day and night shifts operations, indicating a possible delay in receiving the signal. The water temperature of the engine and the effective fuel consumption showed lower variability in nighttime operation with average values of 81°C and 22.66 L ha-1, respectively. The hourly fuel consumption had greater variability and consequently lower quality during the night of the operation, with an average consumption of 25.46 L h-1 while the day shift showed 26.86 L h-1.

Restructuring and international competitiveness: the Mexican automobile industry

Includes bibliography

Mudanças na prática docente no ensino de física: espaços, tempos e movimentos de experiências vividas por uma professora

Este trabalho consiste de uma pesquisa narrativa autobiográfica em que realizei uma investigação sobre mudança na minha prática docente, a partir da seguinte questão norteadora: Que contribuições para a mudança na prática docente podem emergir de experiências vividas no contexto da docência de uma professora de Física no Ensino Médio? O estudo foi realizado com base em quatro experiências vividas na atuação docente: no Projeto Pré-Vestibular Solidário (PPVS), em uma escola da rede particular, em duas escolas da rede pública de ensino em Santarém-PA, e na prática pedagógica com o Ensino de Física Através de Temas (EFAT), a qual foi realizada em uma escola da rede estadual de ensino em Ananindeua-PA. Esta última experiência consistiu de um trabalho em cooperação com a professora praticante responsável pela turma de 32 ano noturno, em que foi realizada a prática. Como material de análise fiz uso das memórias de docência das três primeiras experiências e registros construídos a partir da experiência com o EFAT por meio de diários de aula produzidos por mim e pela professora praticante, relatos e depoimentos dos estudantes, além de entrevista com a professora. Interagi com esses materiais de análise no sentido de construir compreensões sobre o processo de mudança em minha prática, na perspectiva dos professores como agentes de mudança educacional, segundo Goodson (2008a, 2008b) e Fullan (2009), e trato de mudanças nas crenças e valores pessoais. Das análises construídas identifiquei como elementos de mudança: rupturas/reconstruções de modelos e concepções de processo ensino-aprendizagem, ser docente, ciência, conhecimento científico e dimensões formativas decorrentes do aprendizado em Física; os desafios referentes a complexidade do cotidiano na sala de aula, as incertezas da prática, a construção de uma relação dialógica com os estudantes, promover a motivação para o processo ensino-aprendizagem em Física, a busca da aprendizagem contínua, reconstrução do papel de professora e estudantes no processo ensino-aprendizagem, desenvolver a prática compartilhada, as dificuldades das condições de produção docente; a interação decorrente das trocas com colegas professores, e estudantes, que propiciaram a construção coletiva e compartilhada da prática, a construção de valores e atitudes como a confiança, receptividade, a flexibilidade; e o movimento interno que diz respeito a inquietação, insatisfação, o conflito relacionados aos modos de condução da prática docente, o olhar constante para si, além das crenças na mudança. Das análises realizadas concluo que a mudança na minha prática docente no ensino de Física tem relação com o modo como enfrentei os conflitos decorrentes dos distanciamentos entre a formação e atuação docente, uma vez que no decurso da formação são construídos modelos e concepções de ciência, docência, processo ensino-aprendizagem, dentre outros que se distanciam do fazer cotidiano nos contextos de atuação e que por vezes necessitam ser reconstruídos. Assim, a mudança na minha prática docente envolveu múltiplas dimensões, aprendizados contínuos, abertura ao diálogo, flexibilidade para construir e reconstruir crenças e valores, modos de ser e agir na docência.

Comparing support vector machines and artificial neural networks in the recognition of steering angle for driving of mobile robots through paths in plantations

The use of mobile robots turns out to be interesting in activities where the action of human specialist is difficult or dangerous. Mobile robots are often used for the exploration in areas of difficult access, such as rescue operations and space missions, to avoid human experts exposition to risky situations. Mobile robots are also used in agriculture for planting tasks as well as for keeping the application of pesticides within minimal amounts to mitigate environmental pollution. In this paper we present the development of a system to control the navigation of an autonomous mobile robot through tracks in plantations. Track images are used to control robot direction by pre-processing them to extract image features. Such features are then submitted to a support vector machine and an artificial neural network in order to find out the most appropriate route. A comparison of the two approaches was performed to ascertain the one presenting the best outcome. The overall goal of the project to which this work is connected is to develop a real time robot control system to be embedded into a hardware platform. In this paper we report the software implementation of a support vector machine and of an artificial neural network, which so far presented respectively around 93% and 90% accuracy in predicting the appropriate route. (C) 2013 The Authors. Published by Elsevier B.V. Selection and peer review under responsibility of the organizers of the 2013 International Conference on Computational Science

Do Circadian Preferences Influence the Sleep Patterns of Night Shift Drivers?

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

STOWING AWAY ON SHIPS THAT PASS IN THE NIGHT: SCLEROBIONT ASSEMBLAGES ON INDIVIDUALLY DATED BIVALVE AND BRACHIOPOD SHELLS FROM A SUBTROPICAL SHELF

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

Comparative analysis between a PEM fuel cell and an internal combustion engine driving an electricity generator: Technical, economical and ecological aspects

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

Stay out (almost) all night: contrasting responses in flight activity among tropical moth assemblages

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

NIGHT FLIGHT ACROSS A BLUE SKY: PROGNOSTICS

The purpose of this presentation is to gain new perspectives on pest control and related phenomena. Some will call it “blue sky.” I would claim it informal futuristics. Systems men call such efforts feedforward; others grandify it with “prognostics.” Some say prognostics is one of the leading challenges of the day. We must anticipate future developments and imagine or invent new alternatives as a background for rational choice. The activity can influence today’s decisions, modify our concepts of risks and probable payoffs, and can help those of us who ask: “What am I really doing; what should I be doing?”

DRIVING AND RESTRICTIVE FACTORS IN THE PROCESS OF KNOWLEDGE CREATION: A COMPARATIVE CASE STUDY IN BRAZILIAN TECHNOLOGY-BASED ENTERPRISES

The article aims to analyze the process of knowledge creation in Brazilian technology-based companies, using as a background the driving and restrictive factors found in this process. As the pillars of discussion, four main modes of knowledge conversion were used, according to the Japanese model: socialization, externalization, combination and internalization. The comparative case method through qualitative research was carried out in nine technology-based enterprises that had been incubated or have recently passed through the stage of incubation (so-called graduated companies) in the Technology Park of Sao Carlos, state of Sao Paulo, Brazil. Among the main results, the combination of knowledge was identified as more conscious and structured in graduated companies, in relation to incubated companies. In contrast, it was noted that incubated companies have an environment with greater opportunities for socialization, internalization and externalization of knowledge.

Weight gain in relation to night work among nurses

Objective: To investigate the relationship between working at night and increased body weight in nursing. In addition, we evaluated the differences in the proportion of variables sociodemographic, work and health, according to the work shift and their association with body mass index. Methods: Based on questionnaires, we obtained data from 446 nursing professionals about aspects of their job, health and lifestyle. We performed linear and logistic regression analysis. Results: Working at night is associated with a weight gain greater than (beta=0.24 kg/m(2)) working during the day (beta=0.15 kg/m(2)), as well as with aging (beta=0.16 kg/m(2)) and duration of working in nursing (beta=0.18 kg/m(2)). Night workers have a higher educational level, have been working for more years in nursing and also in the current shift, do not have diabetes and have reported longer sleep than day workers. There are also a higher number of smokers among the night workers than day workers. Logistic regression analysis also showed the more time to work in nursing and as an assistant was more likely to develop overweight/obesity. Conclusion: Working at the night contributes to more weight gain than the day shift, aging and duration of working in nursing.