Electrically, Chemically, and Photonically Powered Torsional and Tensile Actuation of Hybrid Carbon Nanotube Yarn Muscles

Artificial muscles are of practical interest, but few types have been commercially exploited. Typical problems include slow response, low strain and force generation, short cycle life, use of electrolytes, and low energy efficiency. We have designed guest-filled, twist-spun carbon nanotube yarns as electrolyte-free muscles that provide fast, high-force, large-stroke torsional and tensile actuation. More than a million torsional and tensile actuation cycles are demonstrated, wherein a muscle spins a rotor at an average 11,500 revolutions/minute or delivers 3% tensile contraction at 1200 cycles/minute. Electrical, chemical, or photonic excitation of hybrid yarns changes guest dimensions and generates torsional rotation and contraction of the yarn host. Demonstrations include torsional motors, contractile muscles, and sensors that capture the energy of the sensing process to mechanically actuate.

Liberdades possíveis em espaços periféricos: escravidão e alforria no termo da vila de Arez (séculos xviii e xix)

This paper discusses aspects of the slavery and emancipations in the village of Arez between the last quarter of the eighteenth century and the first decades of the nineteenth century. It seeks to identify the profile of the slaves and the emancipation possibilities in a peripheral region with few commercial activities, given that the most of the approaches about manumission consider towns and cities where the economic dynamics ware more pronounced, as places of higher possibilities of slaves working in diverse activities that allowed them to accumulate a reserve fund and thus buy their freedom. Therefore it was necessary to raise evidences of slavery in the case study, which was based on surveys of the eighteenth century, and the first decades of the nineteenth century and some population maps and civil records related to the early nineteenth century. The information about the manumission acts were analyzed based on writs of freedom registered in the village of Arez between 1774 and 1827 due to the absence of other documents about it. The registry books include all the documents of the Arez community; so, it was possible to observe what happened in rural localities, in the town, in the headquarters of the district and in the village of Goianinha. Based on information from the documents, it was possible to address some aspects of slavery like the predominant types of groups, the possible activities in which slaves were inserted and the profile of the freed slaves, the emancipation modes and, therefore, discuss the possible relations ship between the colonial space and manumissions and between masters and slaves

Doadores de sangue: qualidade de vida e atendimento em hemocentro de Natal / RN

The context of blood donation in Brazil faces problems since the start of its operations in the 1940, in the beginning the biggest obstacle was obtain safe and qualified blood, and then, established criteria for donations, the barrier is the low number of suitable candidates for donation. This suitability is associated with the good health of those who goes to the services of blood banks and the return of the donor is often conditioned by the way care is given and perceived by the user. The quality of life, defined as a perception that a person has of her/his position in the world, can influence the health and emerges as a way to focus on the subjectivity in a context dominated by objective and practical exams; listen to the views about the received services increases the focus on the user and provides feedback to the institution, guiding and planning its future actions. The purpose of this study was to verify the quality of life in blood donors and their perceptions of care in a blood center in Natal/RN. This is a descriptive cross sectional study conducted with blood donors from Dalton Cunha Barbosa blood center. The used protocols were: a structures questionnaire with questions on sociodemographic and services perception data, and SF-36 quality of life instrument. The sociodemographic and SF-36 data ware analyzed using descriptive and inferential statistics, using the statistical package PASW 18.0; those related to treatment were submitted to thematic content analysis. The results revealed a sample mainly composed by men, married people, who attended high school and had already made previous donations, with the first two groups returning more often for donations. The scores of the SF-36 confirm the certificated of good health of the screens, beind high in all areas and featuring a healthy population; statistically significant differences were denoted between sexes, levels of education and marital status. The speeches about the service were mostly positive and had as main focus acess, agility, technical aspects and subjective feelings. The data regarding the Rio Grande do Norte blood donors profile confirmed some characteristics of the Brazilian ones, those data of the SF-36 were similar to those found in studies with healthy groups and the impressions about the care received show similarities with national and international studies about the attendance at blood banks

O circuito espacial da indústria de cerâmica vermelha no seridó potiguar

This research has as an empirical universe, the productive territory of red ware in the Seridó region of Rio Grande do Norte. In the last years this territory has gone through a process of appropriation that has been substantially changing the environmental and social dynamism of the place. However, the industry of red ware has been focusing in some areas, mainly, in the county of Parelhas and Carnaúba dos Dantas. From this point of view, the aim of this work consists in analyze the use of these areas by the red ware industry and the transformations occurred with the expansion of the number of industries and the productivity raise, that requires bigger amounts of earthenware and wood, resources that are low in referred territory. As the result of this process, the suitable alternative has been to acquire inputs in other Rio Grande do Norte counties, as well as in Paraíba counties. To reach the proposed objective, the methodology of this work was consisted of bibliographic and empirical research, regarding the occupation that this activity covers in the Seridó region. From the information obtained during the research, it can be stated that the inputs to the production execution in the red ware industry are acquired in the geographic nearby lands. The analysis of the stages of the production(acquisition of raw material, production and commercialization) showed that the activity acts in a continuous area, having as principal consumer market other northeastern states and the state of Pará. The present study revealed that the pottery activity is set as untenable, because of non-stopping use of the argil and wood, resources that are vanishing from the area, which consume causes a many problems such as deforestation and erosion. Besides, the sale of productive lands for the red ware industries makes harder its good use by the familiar agriculturists in the development of agriculture and cattle raising activity, which for many times is the main economic activity of the place. The precariousness reveals in the constant accidents at work, that most of them are neglected by the local authorities, without any penalty to the industries. Therefore, the industry of red ware in Seridó uses the territory as a resource, leaving its environmental problems that my compromise the quality of life of the actual and future generations

Prevalência de más oclusões na primeira infância e sua relação com as formas de aleitamento e hábitos infantis

OBJETIVO: identificar a prevalência e os tipos de má oclusão encontrados em crianças dentro da faixa etária de 2 a 4 anos; e correlacionar a presença de más oclusões com a forma de aleitamento e com os hábitos bucais infantis. METODOLOGIA: foram avaliadas por meio de exame clínico 226 crianças de 2 a 4 anos, sendo 100 delas inseridas no programa de prevenção do Centro de Pesquisa e Atendimento a Pacientes Especiais (Cepae) - FOP UNICAMP, e 126 pertencentes a creches municipais da cidade de Piracicaba. Foi também aplicado um questionário dirigido aos responsáveis a respeito dos hábitos infantis e formas de aleitamento, sendo os dados submetidos à análise estatística de Fischer (p < 0,05). RESULTADOS E CONCLUSÕES: observou-se alta prevalência de más oclusões (superior a 50% da amostra avaliada) e verificou-se uma correlação positiva entre a falta de amamentação natural e hábitos bucais inadequados em relação à presença de más oclusões na amostra analisada. A chupeta revelou-se a variável mais significativa na contribuição para a instalação de más oclusões.

Electromyographic fatigue threshold of the biceps brachii: The effect of endurance time

Muscle fatigue can be a limiting factor to determine index as the electromyographic fatigue threshold (EMGFT) due the alterations in motivation and disconfots. This way, the purpose of this study was to identify the right biceps brachii and left biceps brachii obtained from repetitive elbow flexions at each 10% of total time. Nine healthy subjects performed the exercise named biceps curl until exhaustion with 25%, 35%, and 45% of one repetition maximum, in three different days. EMG amplitude (root mean square - RMS) was obtained for concentric contractions during these load levels and correlated with time to determine the slope values for each load and them detemine the EMGFT. The EMGFT was obtained within of each 10% of total time and they were compared by analysis of variance. The results showed a progressive increase in RMS with time, for both muscles in all loads, characterizing the muscle fatigue process, and for the EMGFT values ware not found predominantly significant differences between the execution time, as well as between muscles (right biceps × left biceps). This protocol allowed to identify the EMGFT to both muscles during the biceps curl, which was similar at different percentage of total time, indicating the possibility to reduce the length of the contraction test without the need to maintain the contraction until exhaustion. Further studies are needed to evaluate the applicability of this method to determining the effects on performance.

Períodos de interferência de uma comunidade infestante na cultura do milho em primeira e segunda safras

Pós-graduação em Agronomia (Agricultura) - FCA

Metabolismo energético do camarão da amazonia, Macrobrachium amazonicum

Pós-graduação em Biologia Geral e Aplicada - IBB

Carta geoambiental (1:50.000) e trilhas interpretativas da zona turística do Vale do Pati, Chapada Diamantina-BA

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Modelagem matemática e análise dinâmica da torre de um pulverizador de pomares

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Detecção eletroquímica de furfural e hidroximetilfurfural em bagaço de cana-de-açúcar utilizando cromatografia líquida de alta eficiência

Pós-graduação em Química - IQ

Avaliação do lodo de curtume como fonte de nutrientes para o crescimento inicial de eucalipto

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Heterose e capacidade combinatória em melão rendilhado

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Os custos socioeconômicos e ambientais dos impactos da urbanização de Imperatriz nos mananciais urbanos: um estudo de caso na micro-bacia do Riacho Bacuri

A análise tem como linha de pesquisa urbanização, cidades da Amazônia e meio ambiente. Foi realizado um levantamento histórico do potencial hidrográfico da região, onde está localizada atualmente a cidade de Imperatriz-MA, identificando geograficamente todas as nascentes, mananciais e afluentes do rio Tocantins. De posse desses dados e informações, foi possível traçar o perfil quantitativo e qualitativo dos riachos que cortam o perímetro urbano do município. O estudo faz uma abordagem também dos custos dos impactos provocados pelo processo da urbanização do município de Imperatriz-MA, contra a micro-bacia do riacho Bacuri. Análise do fato está focada na problemática da poluição do riacho, e as manifestações negativas adventícia do processo de degradação. Faz-se um levantamento sistematizado intertemporal dos elementos da fauna e da flora aquática que existiam e os que, ainda remanesce na localidade próxima a esse manancial, expondo os impactos socioeconômicos e ambientais, ocorrido ao longo dos anos, contra o homem e a natureza.

Avaliação de germoplasma de quiabeiro (Abelmoschus esculentus) quanto à resistência ao oídio (Erysiphe cichoracearum)

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)