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Amélioration de la résistance des stratifiés pour bateaux ArchiMer
Hildebrand, M.
The material properties of over 50 different laminates made by a group of Finnish boat-yards have been measured in a large test project. Tension, compression, bending, interlaminar shear and impact tests have been carried out for all the laminates. Among others, different polyester resins, different woven and non-woven fabrics, chopped strand mat and unidirectional roving were used as basic ply materials. The effect of various parameters has been determined not only on the maximum failure strength, but also on the strain level at which the first failure occurs. Main differences between the ratio of static and impact test results of the different materials have been determined. The results show that by choosing certain material parameters efficiently,...
Tipo: Text Palavras-chave: Strength; Ship technology; Composite materials; Résistance mécanique; Bateaux; Stratifiés; Matériaux composites.
Ano: 1992 URL: http://archimer.ifremer.fr/doc/1992/acte-1084.pdf
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Características físicas da fibra e do fio dos algodoeiros arbóreo e herbáceo em melhoramento no Nordeste do Brasil. Infoteca-e
SANTANA, J.C.F. de; FREIRE, E.C.; CARVALHO, L.P.; COSTA, J.N. da; GUSMAO, J.L. de; SILVA, J.A. da..
1989
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E) Palavras-chave: Algodao; Fibra; Melhoramento; Caracteristicas fisicas; Fio; Cultivar; Comprimento; Finura; Resistencia; Maturidade; Tenacidade; Alongamento; Arboreo; Moco; Herbaceo; Gossypium hirsutum; Brasil; Nordeste; Pernambuco; Surubim; Caruaru; Paraiba; Sousa; Itaporanga; Patos; Riacho dos Cavalos; Ceara; Iguatu; Piaui; Eliseu Martins; Annual; Perennial; Cotton; Breeding; Upland; Physical; Properties; Yarm; Fiber; Length; Fineness; Strength; Maturation; Breaking; Length; Elongation; Rupture.
Ano: 1989 URL: http://www.infoteca.cnptia.embrapa.br/handle/doc/262827
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Decreased respiratory performance of children and adolescents with myelomeningocele who use a wheelchair – preliminary data BJMBR
Martins,E.J.; Gastaldi,A.C.; Davoli,G.B.Q.; Leonardi-Figueiredo,M.M.; Mattiello-Sverzut,A.C..
Myelomeningocele (MMC) is a neural tube defect that often causes spinal cord injury at the thoracolumbar region, as well as sensory and motor paralysis in the lower limbs. This leads to continuous use of a wheelchair and, consequently, a sedentary lifestyle, predisposition to muscle weakness, cardiovascular and respiratory disorders, obesity, and structural alterations in the spine. We assessed the respiratory function and shoulder strength of MMC participants who were wheelchair-users and had no respiratory complaints and compared them to healthy children and adolescents. MMC (n=10) and healthy (n=25) participants of both genders with a mean age of 12.45 years (SD=2.1) were assessed for weight, height, respiratory performance, and isometric peak for...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Spirometry; Lung function; Non-ambulatory; Strength; Spina bifida.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2019000800608
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Efeito do comprimento do corpo de prova nas propriedades mecânicas do carvão de Eucalyptus PFB - Pesquisa Florestal Brasileira
Veiga, Taís Regina Lima Abreu; Lima, José Tarcísio; Monteiro, Thiago Campos; Rocha, Maria Fernanda Vieira; de Jesus, Márcia Silva; Goulart, Selma Lopes.
As propriedades mecânicas do carvão são indicadoras de qualidade e influenciam no processo siderúrgico. Os ensaios de avaliação (queda e tamboramento), em geral, apresentam resultados variáveis, comprometendo sua confiabilidade. Por isso, é importante desenvolver metodologias que produzam resultados comparáveis. Esse trabalho objetivou analisar a influência do comprimento do corpo de prova na determinação da rigidez e resistência da madeira e do carvão. Foram utilizados clones de Eucalyptus urophylla, dos quais foram produzidos corpos de prova de seção transversal de 25 mm x 25 mm e comprimentos de 50 mm, 75 mm, 100 mm e 125 mm. Dez amostras de cada comprimento foram selecionadas para a realização do ensaio com madeira, e outras dez para os ensaios com...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Engenharia Florestal; Recursos florestais Madeira; Resistência; Qualidade do carvão Wood; Strength; Charcoal quality.
Ano: 2016 URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/1073
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Erosion threshold of sand-mud mixtures ArchiMer
Jacobs, Walter; Le Hir, Pierre; Van Kesteren, Walther; Cann, Philippe.
Results of a large number of erosion tests on artificially generated and relatively dense sand-mud mixtures are presented. Soil sample compositions are varied concerning clay-silt and sand-silt ratio, and clay mineralogy. The experimental set-up consists of a re-circulating small-scale rectangular erosion flume with unidirectional flow conditions. The erosion threshold and erosion rate are studied through step by step increasing the flow rate during a test. Results clearly indicate time-decreasing erosion during which individual flocs are randomly eroded, and time-independent (steady) erosion during which both sand and mud particles are continuously and uniformly eroded. These two erosion types appear to be floc and surface erosion, respectively...
Tipo: Text Palavras-chave: Erosion; Sand-mud mixtures; Clay; Sediment structure; Critical shear stress; Strength.
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00041/15252/12678.pdf
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Fasting: a major limitation for resistance exercise training effects in rodents BJMBR
das Neves,W.; de Oliveira,L.F.; da Silva,R.P.; Alves,C.R.R.; Lancha Jr.,A.H..
Protocols that mimic resistance exercise training (RET) in rodents present several limitations, one of them being the electrical stimulus, which is beyond the physiological context observed in humans. Recently, our group developed a conditioning system device that does not use electric shock to stimulate rats, but includes fasting periods before each RET session. The current study was designed to test whether cumulative fasting periods have some influence on skeletal muscle mass and function. Three sets of male Wistar rats were used in the current study. The first set of rats was submitted to a RET protocol without food restriction. However, rats were not able to perform exercise properly. The second and third sets were then randomly assigned into three...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Strength; Physical activity; Hypertrophy; Atrophy; Skeletal muscle wasting.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2018000100602
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Growth and yield respones of maize (Zea mays L.) to soil water deficits. Ⅱ. Effects of water deficit timing and strength Taiwan Agricultural Research Institute
Chwen-Ming Yang; Ming-Jen Fan; Wei-Min Hsiang; 楊純明; 范明仁; 向為民.
[[abstract]]Water is a major limiting factor on maize production in Taiwan. It is very important, therefore, to study the relations of soil moisture stress and maize (Zea mays L.) yield under local conditions. This field work was conducted on the experimental farm of Taiwan Agricultural Research Insitiute (TART) at Wufeng, Taiwan to evaluate the relative effects of water deficit timing and strength on the growth and yield of maize, cultivar Tainung No. 1. Water stress was imposed by the withholding of irrigation during reproductive growth phase (fall crop 1991) and vegtative growth phase (spring crop 1992), respectively, to cause soil water potentials to the range from − (control) to −10 bars. It was shown that leaf number per plant was not significantly...
Palavras-chave: Growth; Maize; Soil water deficit; Strength; Timing; Yield 生長; 產量; 玉米; 土壤缺水; 缺水時期; 缺水程度 [[classification]]6.
Ano: 1993
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Mechanical and Structural Characteristics of Cement Mortars Blended with Locust Bean Pod Ash CIGR Journal
Akpenpuun, Timothy Denen; Akinyemi, Banjo; Olawale, Olamide; Aladegboye, Oluwasegun Joshua; Adesina, Olalere Israel.
This study looks at the effect of cement replacement with locust bean pod ash (LBPA) as a supplementary cementitious material on compressive strength of mortars. The fresh properties (workability, initial and final setting times), compressive strength at 7, 14, 21 and 28 days and microstructural analysis (SEM, EDS and XRD) were evaluated. LBPA were considered at replacement levels of 0, 10, 15, 20 and 30% of cement mass for preparation of the mortar samples. Workability of the cement mortars reduced as the content of LBPA increases while initial and final setting times increased in relation to increase in LBPA content in the matrix. An increase of about 79% in compressive strength at 7 days, 100% at 14 days, 147% at 21 days and 136% at 28 days were...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Farm Structures and Environment compressive; Strength; Agro-waste; Pod; Ash.
Ano: 2019 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/5525
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Microflambage et rigidite des composites a fibres longues: Theorie et experiences ArchiMer
Ferron, G; Cardin, C; Grandidier, J; Potier, F.
An original flexion-compression device designed for investigating the elastic behaviour in compression is presented, and the effect of the loading mode on the characteristics of failure is then described. Results on glass-epoxy resin unidirectional composites and laminates are discussed. In the literature the failure of laminated in compression is often ascribed to a mechanism of fiber microbuckling. To discuss the quality of these models, a periodic array of stiff and soft layers is analysed by an asymptotic method. The results are compared with those in the literature and with experimental observations.
Tipo: Text Palavras-chave: Compression; Strength; Ship technology; Composite materials; Asymptotique; Développement; Expériences; Microflambage; Compression.
Ano: 1992 URL: http://archimer.ifremer.fr/doc/1992/acte-1044.pdf
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Multicomponent training with different frequencies on body composition and physical fitness in obese children Anais da ABC (AABC)
ALVES,ANA SOFIA R.; VENÂNCIO,TELMA L.; HONÓRIO,SAMUEL ALEXANDRE A.; MARTINS,JÚLIO MANUEL C..
Abstract: Introduction: The aim of the study was to compare the effects of ten-week multicomponent training with different exercise frequencies on body composition (BC) and physical fitness (PF) in overweight and obese young children. Methods: 40 children, aged 12-15 (14.77±1.49), were randomly selected and assigned to experimental groups to train three times/week (EG1) or two times/week (EG2) for 10 weeks and a CG group (no training program). Results: It was shown that experimental groups (EG1 and EG2) improved similarly aerobic capacity (3.8% and 3.5%, respectively), muscular strength (29.7% and 25.2%), flexibility (6.1% and 9.9%), body mass index (5.0% and 4.6%), and body fat (6.4% and 5.6%) from pre- to post-training. CG group showed no significant...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Aerobic; Health; Obesity; Strength; Youth; Program.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700802
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Simulation of tensile tests of hemp fibre using discrete element method CIGR Journal
Chen, Ying; Sadek, Mohammad A.; Guzman, Leno; Lague, Claude; Landry, Hubert.
Abstract: Tensile strength is an important property of hemp fibre, because it determines the mechanical strength of fibre-based products such as biocomposites.  Commercial discrete element software, Particle Flow Code in Three Dimensions (PFC3D), was used to develop a numerical model which simulates tensile tests of hemp fibre.  The model can predict the tensile properties (such as strength and elongation) of a hemp fibre. In the model, a virtual hemp fibre was defined as a string of spherical balls, held together by cylindrical bonds implemented in PFC3D.  To calibrate the model, tensile data was collected for both unretted and retted hemp fibres using a commercial Instron testing system.  The average fibre diameter was 0.34 mm for the unretted fibre and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Bioprocessing; Machinery Hemp; Fibre; PFC3D; Tensile; Strength; Elongation; Simulation.
Ano: 2014 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/2455
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THE USE OF SISAL FIBRE AS REINFORCEMENT IN CEMENT BASED COMPOSITES AGRIAMBI
Tolêdo Filho,Romildo Dias; Joseph,Kuruvilla; Ghavami,Khosrow; England,George Leslie.
ABSTRACT The inclusion of fibre reinforcement in concrete, mortar and cement paste can enhance many of the engineering properties of the basic materials, such as fracture toughness, flexural strength and resistance to fatigue, impact, thermal shock and spalling. In recent years, a great deal of interest has been created worldwide on the potential applications of natural fibre reinforced, cement based composites. Investigations have been carried out in many countries on various mechanical properties, physical performance and durability of cement based matrices reinforced with naturally occurring fibres including sisal, coconut, jute, bamboo and wood fibres. These fibres have always been considered promising as reinforcement of cement based matrices because...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Composite material; Natural fibres; Concrete; Mortar; Strength; Stiffness; Durability.
Ano: 1999 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43661999000200245
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