44 research outputs found
Occurrence of domestic and intrusive triatomines (Hemiptera: Reduviidae)in sylvatic habitats of the temperate Monte Desert ecoregion of Argentina
No full textThe eco-epidemiology of Triatominae and Trypanosoma cruzi transmission has been little studied in the Argentinean Monte ecoregion. Herein, we provide a comprehensive description of domestic and intrusive triatomines to evaluate the risk of reinfestation of rural dwellings. Triatoma infestans, T. patagonica, T. garciabesi and T. eratyrusiformis were collected by active searches or light traps. None were infected with T. cruzi. One T. infestans male was collected at 1.3 km from the nearest infested house. The finding of intrusive and domestic triatomines in sylvatic foci emphasizes the need of implementing an effective vector surveillance system.Fil: Carbajal de la Fuente, Ana Laura. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Ecología, Genética y Evolución; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Ecología, Genética y Evolución de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Ecología, Genética y Evolución de Buenos Aires; ArgentinaFil: Fernández Deagustini, María del Pilar. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Ecología, Genética y Evolución; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Ecología, Genética y Evolución de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Ecología, Genética y Evolución de Buenos Aires; ArgentinaFil: Piccinali, Romina Valeria. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Ecología, Genética y Evolución; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Ecología, Genética y Evolución de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Ecología, Genética y Evolución de Buenos Aires; ArgentinaFil: Rodríguez Planes, Lucía Inés. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Ecología, Genética y Evolución; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Ecología, Genética y Evolución de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Ecología, Genética y Evolución de Buenos Aires; ArgentinaFil: Duarte, Rosemere. Fundación Oswaldo Cruz; BrasilFil: Gurtler, Ricardo Esteban. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Ecología, Genética y Evolución de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Ecología, Genética y Evolución de Buenos Aires; Argentina. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Ecología, Genética y Evolución; Argentin
As percepções dos professores do ensino médio sobre o uso de tecnologias da informação e da comunicação na educação
No full textInvestigates the perceptions of high school teachers from CIEP Brizolão 165 - Brig Sergio Carvalho on the use of information and communication technology. Public policies for High School are presented and the consequent challenges for teachers; ICT integration in teaching and the challenges faced by teachers, also the perceptions of teachers on the use of ICTs in education and their influences on the integration process ; we present the methodological options that have underpinned this study and the results obtained with the questionnaire, from which we obtained indicators that allowed us to make possible deductions and inferences and analysis of these results in order to bring thoughts on the perceptions of these teachers about the use of ICTs.Investiga as percepções dos professores do ensino médio do Ciep Brizolão 165 – Brigadeiro Sérgio Carvalho quanto à utilização das tecnologias da informação e da comunicação. São apresentadas as políticas públicas para o ensino médio e os consequentes desafios colocados aos professores; a integração das TICs no ensino e os desafios enfrentados pelos professores, como também as percepções dos professores sobre o uso de TICs na educação e suas influências no processo de integração; apresenta-se as opções metodológicas que embasaram o presente estudo e os resultados obtidos com o questionário, do qual se obteve indicadores que nos permitiram fazer possíveis deduções e inferências e a análise desses resultados no sentido de trazer reflexões sobre as percepções desses professores sobre o uso das TICs
ENTRE O LITERÁRIO E O EXISTENCIAL, A “ESCREVIVÊNCIA” DE CONCEIÇÃO EVARISTO NA CRIAÇÃO DE UM PROTAGONISMO FEMININO NEGRO NO ROMANCE PONCIÁ VICÊNCIO
No full textResumo: O artigo apresentado discute o romance Ponciá Vicêncio, escrito por Conceição Evaristo, como um texto que se constrói entre o literário e o existencial. A perspectiva de análise da produção literária é filosófica, destacando o questionamento à existência humana negra, através da abordagem criada pela autora, com enfoque nas experiências de afro-brasileiros, mas com particular atenção àquelas que dizem respeito às mulheres negras na sociedade brasileira.
Palavras-chave: existência negra; autoria negra; “escrevivência”; Ponciá Vicêncio.
Abstract: The article presented discusses the novel Ponciá Vicêncio, written by Conceição Evaristo, as a text that is constructed between the literary and the existential. The perspective of analyzing literary production is philosophical, emphasizing the questioning of black human existence, through the approach created by the author, focusing on the experiences of Afro-Brazilians, with particular attention to those that concern black women in Brazilian society .
Keywords: black existence; black authorship; “escrevivência”; Ponciá Vicêncio.
 
ENTRE O LITERÁRIO E O EXISTENCIAL, A “ESCREVIVÊNCIA” DE CONCEIÇÃO EVARISTO NA CRIAÇÃO DE UM PROTAGONISMO FEMININO NEGRO NO ROMANCE PONCIÁ VICÊNCIO
No full textResumo: O artigo apresentado discute o romance Ponciá Vicêncio, escrito por Conceição Evaristo, como um texto que se constrói entre o literário e o existencial. A perspectiva de análise da produção literária é filosófica, destacando o questionamento à existência humana negra, através da abordagem criada pela autora, com enfoque nas experiências de afro-brasileiros, mas com particular atenção àquelas que dizem respeito às mulheres negras na sociedade brasileira.
Palavras-chave: existência negra; autoria negra; “escrevivência”; Ponciá Vicêncio.
Abstract: The article presented discusses the novel Ponciá Vicêncio, written by Conceição Evaristo, as a text that is constructed between the literary and the existential. The perspective of analyzing literary production is philosophical, emphasizing the questioning of black human existence, through the approach created by the author, focusing on the experiences of Afro-Brazilians, with particular attention to those that concern black women in Brazilian society .
Keywords: black existence; black authorship; “escrevivência”; Ponciá Vicêncio.
 
SHORT COMMUNICATION - Comparison between Precipitin and ELISA Tests in the Bloodmeal Detection of Aedes aegypti (Linnaeus) and Aedes fluviatilis (Lutz) Mosquitoes Experimentally Fed on Feline, Canine and Human Hosts
No full textMem Inst Oswaldo Cruz 2001, Volume 96, Number 5, pp. 693-695 SHORT
COMMUNICATION - Comparison between Precipitin and ELISA Tests in the
Bloodmeal Detection of Aedes aegypti (Linnaeus) and Aedes fluviatilis
(Lutz) Mosquitoes Experimentally Fed on Feline, Canine and Human Hosts
Luciana AM Gomes, Rosemere Duarte, Dinair C Lima, Beatriz Sanson Diniz,
Maria Lucia Serrão, Norma Labarthe Code Number: oc01109
ABSTRACT: The identification of arthropod bloodmeals is important in
many epidemiological studies, as, the understanding of the life cycle
of vectors and the patogens they transmit, as well as helping to define
arthropods' control strategies. The precipitin test has been used for
decades, but ELISA is slowly becoming more popular. To compare the two
tests for sensitivity, specificity and accuracy to detect small insect
bloodmeals, Aedes aegypti or Ae. fluviatilis mosquitoes were fed either
on feline, canine or human hosts. Mosquitoes were frozen at 6, 12, 24,
48 or 72 h after feeding. Precipitin test showed better specificity and
accuracy and ELISA test showed higher sensitivity. Better results with
both tests were achieved when mosquitoes were frozen within 48 h from
feeding. KEYWORDS: bloodmeal identification, mosquito, ELISA, canine
blood, feline blood, human blood Copyright 2001 Mem Inst Oswaldo Cru
Correlation between populations of Rhodnius and presence of palm trees as risk factors for the emergence of Chagas disease in Amazon region, Brazil
No full textAmong the states that comprise the legally defined Amazon region of Brazil, Pará has presented the highest occurrences of acute cases of Chagas disease over the last two decades. These cases have been attributed to consumption of fruits from native palm trees. In surveys in rural and wild areas of the municipality of Oriximiná, Pará, triatomine fauna, their main ecotopes and the infection rate due to . Trypanosoma cruzi were identified using active and passive search methods: manual capture and Noireau traps, respectively. A total of 582 ecotopes were surveyed using 1496 Noireau traps. Out of 442 specimens collected, 289 were identified as . Rhodnius robustus and 153 as . Rhodnius pictipes. The infection rate caused by . T. cruzi was 17.4%. The food sources of the triatomines were found to be birds, hemolymph, horses, and rodents. The association between . R. robustus and . inajá palm trees (. Attalea marita), which are abundant in rural areas, was confirmed. On the other hand, . R. pictipes is found in several palm tree species, such as . inajá (. A. marita), . mucajá (. Acrocomia aculeata), . murumuru (. Astrocaryum murumuru) and . patauá (. Oenocarpus bataua), and in bromeliads in wild areas. These occurrences of triatomine species in regions with or without . T. cruzi infection, in the vicinity of the main settlement of the municipality, suggest that there is a need for entomological and epidemiological surveillance in this region.Fil: Ricardo Silva, Alice Helena. Fundación Oswaldo Cruz; BrasilFil: Lopes, Catarina M.. Fundación Oswaldo Cruz; BrasilFil: Ramos, Leandro B.. Fundación Oswaldo Cruz; BrasilFil: Marques, William A.. Fundación Oswaldo Cruz; BrasilFil: Mello, Cícero B.. Universidade Federal Fluminense; BrasilFil: Duarte, Rosemere. Fundación Oswaldo Cruz; BrasilFil: Carbajal de la Fuente, Ana Laura. Fundación Oswaldo Cruz; Brasil. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Toma, Helena K.. Universidade Federal do Rio de Janeiro; BrasilFil: Reboredo Oliveira, Luciana. Fundación Oswaldo Cruz; BrasilFil: Kikuchi, Simone A.. Fundación Oswaldo Cruz; BrasilFil: Baptista, Thaiana F.. Fundación Oswaldo Cruz; BrasilFil: Santos Mallet, Jacenir R.. Fundación Oswaldo Cruz; BrasilFil: Junqueira, Angela Cristina V.. Fundación Oswaldo Cruz; BrasilFil: Gonçalves, Teresa Cristina M.. Fundación Oswaldo Cruz; Brasi
Enhancement of mode I fracture toughness of adhesively bonded secondary joints using different layup patterning of CFRP
No full textDelamination growth in fibre reinforced polymer composites is generally evaluated with experiments that have been standardized for quasi-static load conditions. These tests characterize unidirectional delamination growth in mode I (DCB), mode II (ELS or ENF) of mixed mode conditions (MMB). However, little attention is paid in literature to the applicability of these tests to in-service delamination problems that are generally characterized by planar delamination growth. In this study, the relation between planar delamination growth, induced by transverse quasi-static indentation loading, and these unidirectional delamination tests was investigated. To that aim, prior planar delamination growth tests reported in literature, performed at EPFL, were analysed to identify up to what extent this planar growth could be correlated to the concepts of strain energy release and strain energy density. Once this appeared to successful, an experimental setup was designed to measure the delamination boundary during the transverse indentation loading of planar delamination specimens made of nontransparent carbon fibre reinforced polymer composites. With that set-up, quasi-static and fatigue planar delamination growth experiments were performed, and delamination contours could be successfully captured. While the quasi-static tests revealed limited growth, evaluation with numerical simulations revealed that the indentation force required to extend the delamination quasi-statically would cause damage to the specimen. This is attributed to the increasing length of the delamination contour when delaminations expand, which is not the case with standard unidirectional specimen. With the fatigue tests, however, delamination growth was achieved, but interestingly enough two phases were observed; first the delamination propagated in a planar fashion, while at some point in time work did not exceed an apparent threshold. Instead of no growth, however, the delamination still increased but then in a transverse manner. What makes this study of particular interest, is that the strain energy density as criterion could capture the strain energy offered (work) along the entire delamination contour, while the strain energy release rate described the resistance to delamination growth. This latter observation is in agreement with the original concept employed by Griffith when he formulated the basis of linear elastic fracture mechanics. This presentation present the experiments performed, the analysis of results, and will conclude with a proposal how to relate standard unidirectional tests to planar growth, considering that these standard tests contain little to no information on transverse phenomena with respect to strain energy density (work) and strain energy release (dissipation).Structural Integrity & Composite
How does “listening” help fracture understanding?
No full textUnderstanding the relationship between the sensors’ outputs and the damage evolution within the joints is becoming increasingly crucial to improving structural health monitoring systems and collecting data to improve the joint’s design. Therefore, a study of the acoustic emission method associated with visual fracture evaluation was proposed to give insights into the toughening of composite bonded joints and better understand the relationship between the acoustic emission features and the damage mechanism involved. Thus, two different layups were proposed for the substrates: [0]8 and [0/902/0]S. In addition, a toughened epoxy adhesive with an embedded carrier (AF163-2k) was used to bond the substrates. Five specimens of each stacking sequence were tested under quasi-static mode I loading conditions. A travelling microscope and a regular digital camera were used on the lateral sides of the specimens to track the crack propagation paths. One piezoelectric sensor linked to the AMSY-6 Vallen system was used to assess the acoustic emission features produced within the joints during the tests. Unsupervised machine learning algorithms based on artificial neural networks and the Morlet continuous wavelet transformation were used to pattern recognition of the acoustic emission data. Self-organising maps, together with k-means algorithms, were used for data clustering. Following that, the acoustic emission features of each cluster were associated with the insights obtained from the crack propagation images. Finally, it was observed that the different layups triggered simultaneous toughening mechanisms. The combination of the acoustic emission and the visual evaluation was crucial for a deeper understanding of the underlying phenomena.Structural Integrity & Composite
Uncovering the toughening mechanisms of bonded joints through tailored CFRP layup
No full textAiming to increase damage tolerance of adhesively bonded joints, this work explores the influence of CFRP layup of the adherends on the crack onset and crack propagation of composite bonded joints under mode I loading. Quasi-static Double Cantilever Beam tests were performed using four different CFRP layups bonded with two adhesives. Parallel to the experimental program, finite element analyses were performed to aid in understanding and identifying the various damage mechanisms in each specimen type. The results show that the CFRP layup and adhesive fracture toughness significantly influence the joint fracture phenomena at crack onset and further crack propagation. An enhancement of the joint's mode I fracture toughness values at crack onset was observed in the specimens where a crack competition between the propagation within the bondline and the composite's layers was triggered. During crack propagation, the fracture toughness of the joint increases at crack deflections between the different plies of the CFRP layup until reaching the 0° ply, where sudden delamination occurs. It has been shown that CFRP layup tailoring is a promising toughening method that, when carefully designed, has the potential to increase the maximum effective fracture toughness up to 100% when compared to pure cohesive failure.Structural Integrity & Composite
Comparison between precipitin and ELISA tests in the bloodmeal detection of Aedes aegypti (Linnaeus) and Aedes fluviatilis (Lutz) mosquitoes experimentally fed on feline, canine and human hosts
No full textThe identification of arthropod bloodmeals is important in many epidemiological studies, as, the understanding of the life cycle of vectors and the patogens they transmit, as well as helping to define arthropods' control strategies. The precipitin test has been used for decades, but ELISA is slowly becoming more popular. To compare the two tests for sensitivity, specificity and accuracy to detect small insect bloodmeals, Aedes aegypti or Ae. fluviatilis mosquitoes were fed either on feline, canine or human hosts. Mosquitoes were frozen at 6, 12, 24, 48 or 72 h after feeding. Precipitin test showed better specificity and accuracy and ELISA test showed higher sensitivity. Better results with both tests were achieved when mosquitoes were frozen within 48 h from feeding
