Consulta: subjectFacets:"Tests"
Registros recuperados: 10
Data/hora: 16/06/2024 06:19:01

Les essais mécaniques a la DCN, de l'eprouvette aux structures
Provedor de dados: 5
Autores: Hoarau, P.
In order to correctly dimension surface ship hulls made of organic matrix composites, the DCN carries out different kinds of mechanical testing: Quasi-static and dynamic. Sample size varies from small scale (for material selection) to large scale (for the choice of assembling technology between deck and hull). As often as possible, the DCN performs correlation studies between its experiments and existing numerical tools, in order to improve the accuracy of computer modelling.
Tipo: Text
Palavras-chave: Tests; Materials testing; Ship technology; Composite materials; Essai sur tronçon; Essai mécanique; Structure sandwich; Matériau composite.
Ano: 1992
URL: http://archimer.ifremer.fr/doc/1992/acte-1083.pdf

Les travaux du groupement national materiaux composites en technologie navale
Provedor de dados: 5
Autores: Baudin, M.
This communication presents a research programme concerned with the behaviour of composite materials used in marine structures, including properties, calculation methods, fire behaviour, and fabrication. Conclusions from this project will be presented in the form of recommendation cards which will help French manufacturers to obtain gains in productivity, competitiveness and quality.
Tipo: Text
Palavras-chave: Tests; Materials testing; Fire; Methodology; Mathematical models; Ship design; Ship technology; Composite materials.
Ano: 1992
URL: http://archimer.ifremer.fr/doc/1992/acte-1048.pdf

Construction and use of a dialysis chamber for investigating in situ the toxicity of heavy metals on bacteria.
Provedor de dados: 5
Autores: Tan, T.
Teflon dialysis sampling chambers have been employed to study the toxicity of ZnCl sub(2) on a cadmium-sensitive bacterium, Acinetobacter) CS 13, in an aquarium with running seawater. A concentration of 10 mg Zn super(++) l super(-1) did not influence the cell densities in the chambers, but cell densities decreased at zinc concentrations of 15 and 20 mg l super(-1). In seawater with 20 mg Zn super(++) lu-1 the bacteria accumulated zinc from 827 to 2813 mu g g super(-1) cells dry wt after 1 d. After 2 d the zinc concentration increased to 4625 mu g g super(-1) dry wt. Three chambers were filled with Acinetobacter CS 13 cells added to sterile sediment at a concentration of 1 x 10 super(8) cells ml super(-1) wet sediment. To test the security, these chambers...
Tipo: Text
Palavras-chave: Acinetobacter; Bacteria; Laboratory culture; Tests; Zinc; Dialysis; Toxicity; Heavy metals.
Ano: 1984
URL: http://archimer.ifremer.fr/doc/1984/acte-1012.pdf

Étude du comportement non-linéaire d'une colle dans un assemblage
Provedor de dados: 5
Autores: Cognard, Jean-yves; Sohier, Laurent; Davies, Peter; Gineste, Bernard.
The objective of this study is to define a reliable tool for dimensioning of adhesively bonded assemblies, particularly for marine and underwater applications. A modified “Arcan” fixture, suited for the study of the behavior of bonded metal-metal assemblies, was developed in order to focus on the analysis of the behavior of the adhesive in thin films. To analyze the kinematics of the deformation of the adhesive joint non-contact extensometry techniques were employed. Thus various characteristics of the non-linear behavior of the adhesive were observed. The first results obtained for mixed assemblies (steel, aluminium, composite substrates) show similar behaviour of the adhesive using the proposed procedure. Furthermore, quality controls by DSC, and studies...
Tipo: Text
Palavras-chave: Ssemblages collés; Modélisation; Essais; Comportement non-linéaire; Composites; Adhesive bonding; Model; Tests; Non linear behaviour; Composite.
Ano: 2006
URL: https://archimer.ifremer.fr/doc/00480/59156/61785.pdf

Dégradation de matériaux composites dans un environment marin: Nouveaux materiaux et methodes d'essais
Provedor de dados: 5
Autores: Pomies, F; Carlsson, L; Choqueuse, Dominique; Davies, Peter.
The change in composite material properties when these are exposed to a marine environment is of considerable importance to both designers and users of these materials. In this paper new materials are first studied, composites composed of a glass fibre reinforced thermoplastic PPS matrix. It is shown that their poor interfacial resistance to moisture ingress compromises severely the advantage of using a matrix which does not absorb moisture. In the second part of the paper the application of two non-destructive test techniques for following damage development, based on ultrasonic wave propagation and vibration (modal) analysis, are described. These are complemented by first results from a study using fracture mechanics tests to characterise delamination...
Tipo: Text
Palavras-chave: Fractures; Vibration; Epoxy resins; Tests; Materials testing; Mechanical properties; Ultrasonics; Moisture; Ship technology; Composite materials; Mécanique de la rupture; Vibration; Ultrasonique; Thermoplastique; Epoxyde; Humidité.
Ano: 1992
URL: http://archimer.ifremer.fr/doc/1992/acte-1064.pdf

Correlation essais-calcul pour materiaux composites en application marine
Provedor de dados: 5
Autores: Choqueuse, Dominique; Davies, Peter; Bigourdan, Benoit.
The use of finite element calculations is valuable in the design of composite structures, but few examples of correlations between measured behaviour and finite element calculations are currently available. After definition of a representative type of structure (a stiffened sandwich boat hull), and construction of a test set-up allowing the loading of such panels (uniform pressure loading of 1 m by 2 m panels), modelling was performed in four laboratories using different finite element codes. The results obtained (deflections and strains) have been correlated with test results. A satisfactory correlation is obtained for deflections (differences around 20% for the central deflection) but the correlation between measured and calculated strains is less...
Tipo: Text
Palavras-chave: Tests; Materials testing; Ship technology; Ship design; Composite materials; Raidisseur; Mousse PVC; Panneau sandwich; Clément fini; Pression répartie.
Ano: 1992
URL: http://archimer.ifremer.fr/doc/1992/acte-1046.pdf

Materiaux composites courants: Tenue au feu
Provedor de dados: 5
Autores: Croquette, Jean; Baudin, M.
In the national naval composites project, several series of fire tests have been carried out on epoxy glass pipes and different structural materials commonly used in naval construction. This paper describes the materials tested and the procedures chosen to evaluate the fire reaction properties: flammability (M classification), smoke emission (F classification), and the fire resistance (IMO A 517(13)). The conclusions are given for both the testing procedures and the performance of the composite materials.
Tipo: Text
Palavras-chave: Pipes; Fire; Tests; Materials testing; Ship technology; Composite materials; Tuyauteries; Sandwich; Tenue au feu; Matériau composite.
Ano: 1992
URL: http://archimer.ifremer.fr/doc/1992/acte-1047.pdf

Validación y estandarización de una técnica para biopsia ovárica en el  pargo flamenco, Lutjanus guttatus (Steindachner, 1869)
Provedor de dados: 20
Autores: Alvarez-Lajonchère, L.; Ibarra-Zatarain, Z.; Ibarra-Castro, L.
Se estudió la estandarización y validación de una técnica de  biopsia para la evaluación del desarrollo ovárico del pargo  flamenco, Lutjanus guttatus (Steindachner, 1869). Ovocitos en diferentes estadios estaban presentes a lo largo de los ovarios.  Los ovocitos vitelogénicos se distinguen por su opacidad bajo luz trasmitida. Los diámetros deben ser medidos dentro de las  primeras 36 h después de su fijación en una solución de formalina al 1 % en 0,9 % de NaCl, antes de que su citoplasma sea  clareado con solución Serra, para evitar distorsiones. Los ovocitos vitelogénicos mostraron una distribución de frecuencias de  sus diámetros con una sola moda y sus medias no fueron significativamente diferentes entre los ovarios derecho e izquierdo  (P &gt; 0,05),...
Tipo: Journal Contribution
Palavras-chave: Tests; Sampling (biological).
Ano: 2013
URL: http://hdl.handle.net/1834/4927

A simple test for quality evaluation of cultured fry of marine fish
Provedor de dados: 27
Autores: Dhert, P.; Lavens, P.; Sorgeloos, P.
A stress test is proposed for the evaluation of the physiological condition of fish larvae in nutritional studies. The test was used in a study of quantitative (n-3) highly unsaturated fatty acids (HUFA) requirements in larval &lt;i&gt;Lates calcarifer&lt;/i&gt; and &lt;i&gt;Siganus guttatus&lt;/i&gt;. It enabled to suggest fast intervention at reduced larval quality and allowed to prevent mass mortalities. The stress test offered valuable information for the quantification study of fatty acid requirements in marine fish larvae. In &lt;i&gt;Lates&lt;/i&gt; demands for fatty acids were detected in metamorphosis. In &lt;i&gt;Siganus&lt;/i&gt; on the other hand, the sensitivity of the larvae was considerably reduced after short (n-3) HUFA boosting of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aquaculture; Fry; Quality control; Tests.
Ano: 1992
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=2761

Do Men and Women Perform Differently on Different Types of Test Questions?
Provedor de dados: 31
Autores: Thompson,   Alexi S.; Jager,   Abigail L.; Burton,   Robert O., Jr.
Tipo: Presentation
Palavras-chave: Men; Women; Tests; Questions; Gender; Teaching/Communication/Extension/Profession.
Ano: 2012
URL: http://purl.umn.edu/119771