Influência do tamanho na germinação e no vigor de sementes de milheto (Pennisetum americanum (L.) Leeke)

O milheto é uma gramínea anual de sementes pequenas, com grande diversidade de tamanho, e com dificuldade, às vezes, do estabelecimento da população adequada de plantas. Este experimento objetivou verificar a influência do tamanho da semente de milheto sobre sua germinação e vigor. Foram utilizados quatro lotes de sementes (I, II, III e IV), classificados em quatro tamanhos, através de peneiras de malha quadrada, sendo: peneira 1 ≥ 2,00mm, peneira 2: 1,68 a 2,00mm, peneira 3: 1,41 a 1,68mm, peneira 4: 0,71 a 1,41mm e mais uma porção do lote original (testemunha), que constituíram os tamanhos. Foram realizados os testes de: peso de 1000 sementes, germinação inicial e após seis meses de armazenamento (TGI e TGII, respectivamente) e vigor (primeira contagem do teste de germinação e condutividade elétrica das sementes). Utilizou-se o delineamento experimental inteiramente casualizado, com quatro repetições por tratamento. As sementes de peneira 4 apresentaram menores pesos de 1000 sementes para todos os lotes, menores valores de germinação para o TGI, em todos os lotes, e para o TGII nos lotes II e IV. Para o vigor (primeira contagem do teste de germinação) observou-se menor valor para peneira 4, nos lotes I, II e IV; enquanto para a condutividade, a peneira 4 apresentou maior valor para todos os lotes, indicando pior qualidade fisiológica dessas sementes. Concluiu-se que a germinação e o vigor das sementes de milheto são influenciados pelo seu tamanho; sementes maiores são de melhor qualidade do que as menores.

Uso de confiabilidade na rotulação de exemplos em problemas de classificação multirrótulo com aprendizado semissupervisionado

The techniques of Machine Learning are applied in classification tasks to acquire knowledge through a set of data or information. Some learning methods proposed in literature are methods based on semissupervised learning; this is represented by small percentage of labeled data (supervised learning) combined with a quantity of label and non-labeled examples (unsupervised learning) during the training phase, which reduces, therefore, the need for a large quantity of labeled instances when only small dataset of labeled instances is available for training. A commom problem in semi-supervised learning is as random selection of instances, since most of paper use a random selection technique which can cause a negative impact. Much of machine learning methods treat single-label problems, in other words, problems where a given set of data are associated with a single class; however, through the requirement existent to classify data in a lot of domain, or more than one class, this classification as called multi-label classification. This work presents an experimental analysis of the results obtained using semissupervised learning in troubles of multi-label classification using reliability parameter as an aid in the classification data. Thus, the use of techniques of semissupervised learning and besides methods of multi-label classification, were essential to show the results

Percepção de riscos ambientais de populações vulneráveis a inundações e deslizamentos de dunas em Natal-RN

In urban, flooding and landslides are among the troubles that most bring human and material loss. Therefore, this study objected to perform an analysis on the risk perception on the population living in social environmental vulnerable places in order to understand what is the way this population realize the risks they are exposed to and what are the outbrave strategies the develop. The first analyzed area was Complexo Passo da Pátria for the flooding risk problematic and then the Cidade Nova neighborhood threatened by the dunes slides. The areas locate, respectively, in the West and East zones of Natal-RN. Using an interview screenplay adapted from risk perception researches from different brazilian cities, it was collected primarily data on the variables: perception, evaluation and choice, safety threshold, adjustment, decision and participation. Due to the studied areas characteristics the qualitative approach adjusted itself to the difficulties for accessing the areas. The studied places characterize for its insecure situation like selling/using drugs, robbery and murder among others. Due to this situation the interviewed individuals were the ones that could be found more accessibly and available in the moment and the interviews were made in the community leader presence of each area. Through the discourse of the respondents analysis it was able to conclude that the interviewed population is exposed to a high vulnerability grade and risks. However it was identified substantial differences between the perception and risks of Complexo Passo da Pátria and bairro Cidade Nova, because in the first area the intervied ones can recognize the high risk they are exposed to in a more emphatic way to the interviewed ones for the Cidade Nova neighborhood. Furthermore, there is a heavy dissatisfaction for the population of the two places about the city hall positions relating to the present problems in the studied areas. It was also identified the strategy development of acquaintanceship with the risk in the research places beyond a feeling of belonging and affection between the dwellers and the places, yet it was more evident for Complexo Passo da Pátria. Though this analysis it was possible to understand and perceptions and the behavior of the individuals or social groups facing the risks as acceptance and rejection of determined risks beyond adaptation measures of living together with the persistence presence of risks. Therefore, qualitative nature researches emphasizing the perception approach are in the fundamental importance in the studies about risks making it possible to offer aids to the urban planning and management in the implement of effective preventive measures and compatible with the population aims

Análise espectral do sinal eletromiográfico do músculo eretor da espinha obtido do teste de Sorensen

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

A experiência da toxicomania e da reincidência a partir da fala dos toxicômanos

Este estudo teve como objetivo examinar o fenômeno da toxicomania e sua reincidência a partir da fala dos toxicômanos. Foi realizado em instituição especializada no tratamento da dependência química e problemas relacionados ao uso de álcool e outras drogas, contando com dados do acompanhamento de onze sujeitos. Utilizou-se o referencial teórico psicanalítico para a escuta de indivíduos em situação de toxicomania, com o dispositivo das entrevistas preliminares, dentro do referencial da clínica da urgência em psicanálise. Os resultados do trabalho de escuta e da reflexão apontaram uma série de características psicológicas dos indivíduos estudados de clara relevância para o planejamento de estratégias individuais ou coletivas de atenção ao problema. Destacamos a hipótese de duas modalidades de toxicomania relacionadas com as formas particulares da subjetividade em que ocorre. A questão da reincidência na toxicomania aparece como um falso problema para os sujeitos, que demonstraram que a desintoxicação, concomitante à abstinência e provocada pela internação, é somente um momento de privação, simultaneamente necessária e forçada, do gozo propiciado pela droga. Finda a internação segue-se, geralmente, um novo período de uso. A aceitação da abstinência não significa que os sujeitos fazem uma renúncia, correlata, ao desejo pela droga. É apenas uma parada provavelmente ligada à menor tolerância psíquica à modalidade de gozo em ação na toxicomania, um gozo capaz de confrontar o sujeito com a morte. A abstinência forçada, como estratégia da política pública de saúde, presente no tratamento comum da toxicomania, mostrou conseqüências altamente negativas para o resultado do tratamento, parecendo indicar a necessidade de sua revisão urgente. Procurou-se problematizar a questão da abertura à dimensão subjetiva da experiência dos toxicômanos como estratégia capaz de interferir na trajetória dos sujeitos na relação com as drogas a partir do momento em que buscam ajuda.

Monitoramento temporal da pluma de contaminação no aterro de resíduos urbanos de Rio Claro (SP) por meio do método geofísico da eletrorresistividade

Several factors have contributed to the increase the world production of urban solid waste, resulting in difficulties to the correct management and the final environmentally appropriate disposal, in addition to causing serious socio-economic, environmental, and public health troubles. The soil and groundwater contamination by leachate in waste disposal sites is almost always present, leveraging the emergence and/or adaptation of methodologies for environmental assessment of these areas. The geophysical methods, especially the electrical resistivity method, are fast, reliable and low-cost alternative for this purpose. This paper reports the methodology adopted for the temporal monitoring of the plume of contamination of controlled landfill in the municipality of Rio Claro (SP). Electrical resistivity data were obtained in 1999 and 2008, by the resistivity method, using the techniques of vertical electrical sounding and electrical profile. In both years, similar tests were carried out in the same locations within the disposal area. The results indicated that the plume of contamination has resistivity values less than or equal to 50 ohm.m and moves guided by 2 flows: the main, to the southeast, and the secondary, to the west. Relatively to the first series of tests in 1999, the plume of contamination was higher and deeper in 2008, contrary to what was expected for a landfill deactivated for at least 10 years.

Composition and quantification of the anthropogenic and natural fractions of wastes collected from the stormwater drainage system for discussions about the waste management and people behavior

A study was made of the composition of wastes collected from the pipes of the stormwater drainage system of Sorocaba, SP, Brazil (600 thousand inhabitants). A total of 10 samples weighing at least 100 kg each were sorted into 19 items to determine the fraction that can be considered natural (earth/sand, stones, organic matter, and water, the latter determined after oven-drying the samples) and the anthropogenic fraction (the remaining 15 items, especially construction and demolition wastes and packaging). Soil/sand was found to be the main item collected (52.5 % dry weight), followed by the water soaked into the waste (24.3 %), which meant that all the other wastes were saturated in mud, whose contents varied from 6.4 % (glass) to 87.2 % (metalized plastics packaging). In general, 83 % of the collected wastes can be classified as natural, but the remaining 17 % represent 2,000 kg of the most varied types of wastes discarded improperly every day on the streets of the city. This is an alarming amount of wastes that may clog parts of the drainage systems, causing troubles for all the population (like flooding) and must be strongly considered in municipal solid wastes management and in environmental education programs. © 2013 Springer Science+Business Media Dordrecht.

Análise vibracional do α-tocoferol

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Sociedade de Matemática de São Paulo: um estudo histórico-institucional

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Capital flows to Latin America: third quarter 2001

Events in Argentina dominated most of the third quarter of 2001 until September 11, when the terrorist attacks against the United States prompted a sell-off of emerging markets assets, increasing uncertainty and risk aversion against a background of global economic slowdown. Emerging markets' short term prospects to tap international capital markets deteriorated significantly. In the third quarter of 2001, Latin American countries issued US$7.6 billion in bonds, following US$11.2 billion in the second quarter and US$13.2 billion in the first quarter, which had been a jump from only US$2.9 billion in the last quarter of 2000. At first, it seemed that the pace of debt issuance would slow down considerably given Argentina's troubles in July, as Argentina's bond auction at the beginning of the month was poorly received, forcing the government to shorten the maturity of the new debt and to pay rates as high as those during the Russian crisis in 1998. By August, however, emerging markets rebounded strongly on the back of a new US$8 billion IMF assistance package to Argentina, with both Mexico and Brazil successfully launching large issues. International markets displayed considerable flexibility as investors gave Mexico's US$1.5 billion 30- year bond and Brazil's JPY200 billion two-year samurai issue a warm reception. This return to capital markets was interrupted by the events of September 11, which caused debt issuance to fall sharply in September and October. Following the events of September 11, EMBI+ spreads widened above 1,000 basis points for the first time in nearly two years. According to J.P. Morgan there was a 3.7% market decline in September, which brought year-to-date returns for the EMBI+ to only 0.06%. Emerging markets debt, however, fared better than most other fixed income and equity markets in the immediate aftermath of the attacks. U.S. high-yield market suffered its worst month since August 1998, declining by 6.5%, while the S&P 500 and Nasdaq declined by 8.2% and 17%, respectively. Emerging equity markets suffered even greater declines, with losses as severe as 24% in local currency terms and 31% in U.S. dollar terms.

Linguagem dirigida à criança pequena: a argumentação em foco

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Reorganizando o cotidiano da equipe de saúde mental: um trabalho interdisciplinar por meio do apoio matricial

Pós-graduação em Psicologia - FCLAS

Paralelismo de inversores monofásicos, isolados ou em conexão com a rede, com otimização da resposta dinâmica

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Didática de ciências e de biologia na perspectiva da pedagogia histórico-crítica

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Alguns aspectos problemáticos relacionados ao ensino-aprendizagem da álgebra linear

Este trabalho aborda alguns aspectos que considero como possíveis dificuldades ao ensino-aprendizagem da disciplina Álgebra Linear. Trata-se de uma disciplina de grande importância para muitos cursos de graduação da universidade e considero que qualquer estudo que objetive melhorar este ensino é importante. Contém diversas considerações sobre dificuldades que os alunos podem enfrentar no estudo da disciplina, como aquelas relacionadas ao conhecimento que já trazem do curso médio que tanto podem ser usados como auxilio como também podem causar dificuldades de entendimento dos conceitos mais gerais da disciplina, dificuldades com o uso da geometria, dificuldades com termos conhecidos de outras disciplinas, dificuldades lógicas e outras dificuldades.