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Articoli di riviste sul tema "Structures hybrides et composites"

Autore: Grafiati

Pubblicato: 5 ottobre 2024

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1

Laurin, Frédéric, Cédric Huchette, Nicolas Carrère e Jean-François Maire. "Approche hybride d’endommagement et de rupture pour la prévision de la tenue de structures composites". Revue des composites et des matériaux avancés 22, n. 3 (31 dicembre 2012): 367–81. http://dx.doi.org/10.3166/rcma.22.367-381.

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2

Valadeau, Céline. "Pharmacopées hybrides et corps composites chez les Yanesha du piémont péruvien". Cahiers d'anthropologie sociale N° 14, n. 1 (2017): 135. http://dx.doi.org/10.3917/cas.014.0135.

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3

Soltani, Feyrouz. "Jeux et enjeux du métissage linguistique et culturel dans 'Verre Cassé' d’Alain Mabanckou". HYBRIDA, n. 3 (31 dicembre 2021): 187. http://dx.doi.org/10.7203/hybrida.3.20656.

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Scruter la production littéraire des écrivains africains de la Migritude amène, immédiatement, à une notion-clé à savoir l’hybridité. En effet, la narration africaine contemporaine renverse toutes les normes de l’écriture traditionnelle et stipule le plurilinguisme et le pluriculturalisme. C’est dans cette perspective que la présente contribution propose de mettre en lumière les modalités et les en (jeux) de l’hybridité dans Verre Cassé d’Alain Mabanckou. Il sera question, en premier lieu, de déceler les indices de la rupture esthétique et culturelle. En deuxième lieu, nous viserons à démontrer que l’hybridité dans ce récit, considéré comme un puzzle intertextuel, véhicule une revendication identitaire grâce à l’emploi des structures lexicales, grammaticales et sémantiques hybrides.

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4

Kerboua, B., E. A. Adda Bedia, A. Tounsi e S. Benyoucef. "Solution théorique améliorée pour étudier les interfaces des structures hybrides déformables, renforcées par composites FRP". Matériaux & Techniques 96, n. 1-2 (2008): 49–63. http://dx.doi.org/10.1051/mattech:2008023.

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5

Nduwayo, Pierre. "De l’ex-colonie à l’ex-métropole : vers l’éclatement identitaire dans les romans de Marie NDiaye". HYBRIDA, n. 6 (29 giugno 2023): 33. http://dx.doi.org/10.7203/hybrida.6.26117.

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Depuis la nuit des temps, le monde était un ensemble subdivisé en plusieurs communautés distinctes dont les frontières étaient soit naturelles, soit artificielles. Cependant, les mouvements migratoires de la deuxième moitié du XXe siècle ont renversé cet ordre des valeurs en donnant naissance à des communautés hybrides et multiculturelles. Ces mutations n’ont pas épargné la littérature qui, elle aussi, connaît actuellement des productions artistiques hétérogènes, l’hybrides et métisses. Dans cette dynamique et à la lumière de la théorie postcoloniale, cet article se propose de démontrer que dans la production romanesque de Marie NDiaye, le concept de « limite » ou de « frontière », au sens traditionnel, n’est plus opérant. Ce changement s’observe au niveau thématique d’une part et, d’autre part, au niveau formel. À ce deuxième niveau, la notion de genre littéraire est déconstruite et on assiste à la production des romans qui renferment en leurs structures d’autres genres. Notre raisonnement s’appuie sur un corpus principal de deux romans En famille (1991) et Mon cœur à l’étroit (2007).

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6

Albugues, F. "Essais non destructifs et structures composites hautes performances". Matériaux & Techniques 76, n. 9-10 (1988): 23–26. http://dx.doi.org/10.1051/mattech/198876090023.

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7

Henrotin, Joseph. "Les structures de force et les stratégies des moyens des modes de combat hybrides, vecteurs de sobriété stratégique ?" Stratégique N° 104, n. 3 (2013): 29. http://dx.doi.org/10.3917/strat.104.0029.

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8

Françoise, Kodjo Noëlle, Akpro Lathro Anselme, Saraka Didier Martial, Konan Jean Louis e Niamké Ahonzo Sebastien L. "Caractéristiques Physico-chimiques de L’eau de Coco Immature de Six Descendances Hybrides F1 NJM x GVT". European Scientific Journal, ESJ 18, n. 30 (30 settembre 2022): 60. http://dx.doi.org/10.19044/esj.2022.v18n30p60.

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L'hybride F1 NJM x GVT est un cocotier créé pour lutter contre la maladie du jaunissement mortel du cocotier. Cet hybride a été montré tolérant à la maladie du jaunissement mortel du Ghana. Cependant, planté dans les conditions agro-climatiques de la Côte d'Ivoire, il a été peu étudié au plan biochimique. L'objectif de cette étude est donc d'évaluer les caractéristiques physico-chimiques de l'eau des noix immatures de cocotier issues des descendances d2, d3, d6, d7, d11 et d15 de l’hybride F1 NJM x GVT. Ainsi, ont été déterminés, la masse de l’eau des noix et ses teneurs en matière sèche, cendres, degré Brix, sucres totaux, sucres réducteurs, protéines et composés phénoliques à l’aide de méthodes standards. Les résultats obtenus montrent que les masses de l’eau et le degré Brix ont des valeurs plus importantes pour les descendance d2, d6 et d7. Quant aux eaux des descendances d3, d11 et d15, elles présentent des taux élevés de sucres totaux et de composés phénoliques. Cette hétérogénéité des paramètres physico-chimique de l’eau, offre un large éventail de choix de transformation au plan industriel (boisson, sirop, etc.). Mots clés : eau de coco, descendances, hybride NJM x GVT, caractéristiques physico-chimiques, jaunissement mortel, Côte d’Ivoire. The F1 NJM x GVT hybrid is a coconut palm tree created to lethal yellowing disease. This hybrid has been shown to be tolerant of lethal yellowing disease of Ghana. However, planted under the agro-climatic conditions of the Ivory Coast, it has been little biochemical studied. The present study aims to characterize nutritive composites of immature coconut water from progeny d2, d3, d6, d7, d11 and d15 of F1 NJM x GVT hybrid. Thus, the contents of dry matter, ash, Brix degree, total sugars, reducing sugars, proteins, phenolic compounds and coconut water weight, were determined by standard analysis methods. The results obtained show higher values of coconut water weight and Brix degree in the group of progeny d2, d6 and d7. As for progeny d3, d11 and d15 the have high levels of total sugars and phenolic compounds. This heterogeneity of the nutritive parameters, offers a lot off choices in coconut transformation (drink, syrup, etc.).

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9

Hoarau, Philippe-André. "Réparation et entretien des structures navigantes en matériaux composites". Revue des composites et des matériaux avancés 14, n. 2 (23 agosto 2004): 203–13. http://dx.doi.org/10.3166/rcma.14.203-213.

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10

Barthelmebs-Raguin, Hélène. "Mixed Identities Conquest: Bodily and Textual Hybridations in Malika Mokeddem’s L’Interdite and N’Zid". IRIS, n. 38 (30 giugno 2017): 105–19. http://dx.doi.org/10.35562/iris.1110.

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Le présent article propose d’étudier le métissage culturel, social et linguistique qui compose les identités féminines dans les œuvres de Malika Mokeddem, auteure algérienne de langue française. Cette écrivaine, engagée dans la dénonciation des inégalités entre femmes et hommes, y interroge la notion d’identité à travers l’exploration de différentes images hybrides des corps — l’altérité y tenant une place prépondérante. Refuser le clivage identitaire apparaît dans ses productions romanesques comme un acte fécond, car cela permet d’échapper à l’enfermement dans les clichés et les stéréotypes, en amenant à la création d’identités nomades et plurielles. Dès lors, on ne saurait parler du corps féminin, au singulier, mais bien des corps féminins. Les nombreuses hybridations construisent la réflexion sur les corps des femmes : la singularité d’une identité essentialisante est réfutée au profit d’un corps-texte, se faisant le support des identités plurielles des femmes.

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Barthelmebs-Raguin, Hélène. "Mixed Identities Conquest: Bodily and Textual Hybridations in Malika Mokeddem’s L’Interdite and N’Zid". IRIS, n. 38 (30 giugno 2017): 105–19. http://dx.doi.org/10.35562/iris.1110.

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Abstract (sommario):

Le présent article propose d’étudier le métissage culturel, social et linguistique qui compose les identités féminines dans les œuvres de Malika Mokeddem, auteure algérienne de langue française. Cette écrivaine, engagée dans la dénonciation des inégalités entre femmes et hommes, y interroge la notion d’identité à travers l’exploration de différentes images hybrides des corps — l’altérité y tenant une place prépondérante. Refuser le clivage identitaire apparaît dans ses productions romanesques comme un acte fécond, car cela permet d’échapper à l’enfermement dans les clichés et les stéréotypes, en amenant à la création d’identités nomades et plurielles. Dès lors, on ne saurait parler du corps féminin, au singulier, mais bien des corps féminins. Les nombreuses hybridations construisent la réflexion sur les corps des femmes : la singularité d’une identité essentialisante est réfutée au profit d’un corps-texte, se faisant le support des identités plurielles des femmes.

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12

Jouan, Jean-Alain. "Conception et réalisation de structures de multicoques en matériaux composites". Matériaux & Techniques 75, n. 5-6 (1987): 215–20. http://dx.doi.org/10.1051/mattech/198775050215.

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13

Lataillade, Jean-Luc, Francis Collombet e Jean Pouyet. "Vitesses de sollicitation : effet sur les matériaux et structures composites". Matériaux & Techniques 77, n. 4-5 (1989): 43–49. http://dx.doi.org/10.1051/mattech/198977040043.

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14

Gallicher, G., J. Galy, M.-F. Grenier, F. Méchin, B. Bloch, P. Dublineau, J. P. Pascault e J. F. Stohr. "Les “résines” cyanate pour des structures composites aéronautiques et spatiales". Matériaux & Techniques 84, n. 7-8 (1996): 31–50. http://dx.doi.org/10.1051/mattech/199684070031.

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15

Thévenet, Pascal, Nicolas Pechnik e Didier Guédra-Degeorges. "Modélisation en dynamique rapide des structures composites aéronautiques. Bilan et perspectives". Revue des composites et des matériaux avancés 14, n. 1 (23 aprile 2004): 107–26. http://dx.doi.org/10.3166/rcma.14.107-126.

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16

Temgoua-Noumissing, Alice Mezop. "Les mégalithes à structures composites du Faro (Cameroun) : typologie et fonctions". Afrique : Archeologie et Arts, n. 19 (30 novembre 2023): 35–66. http://dx.doi.org/10.4000/aaa.4901.

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17

Bassetti, D., Y. Bréchet, G. Heiberg, I. Lingorski, A. Jantzen, P. Pechambert e L. Salvo. "Logique floue et algorithmes génétiques appliqués à la sélection de multimatériaux, composites et structures sandwich". Matériaux & Techniques 86, n. 5-6 (1998): 31–37. http://dx.doi.org/10.1051/mattech/199886050031.

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18

Chevallier, Gaël, e Ayech Benjeddou. "Couplage électromécanique effectif dans les structures piézoélectriques composites. Caractérisations expérimentale et numérique". Revue des composites et des matériaux avancés 19, n. 3 (31 dicembre 2009): 339–64. http://dx.doi.org/10.3166/rcma.19.339-364.

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19

Kerboua, B., E. Adda Bedia e A. Tounsi. "Contraintes interfaciales des structures renforcées par composites : effets thermiques et shear lag". Matériaux & Techniques 95, n. 3 (2007): 205–14. http://dx.doi.org/10.1051/mattech:2008005.

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20

Vinet, Alain. "Prise en compte de l’humidité sur structures composites. Modèle, méthode et certification". Revue des composites et des matériaux avancés 23, n. 1 (aprile 2013): 11–17. http://dx.doi.org/10.3166/rcma.23.11-17.

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21

de Bournonville, M. B., D. Bizot, J. Chassaing e M. Quarton. "Structures et propriétés magnétiques de Li2NbF6 et Na2NbF6". Journal of Solid State Chemistry 62, n. 2 (aprile 1986): 212–19. http://dx.doi.org/10.1016/0022-4596(86)90234-3.

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22

Gornet, Laurent, Romain Hamonou, Frédéric Jacquemin, Stéphane Auger e Pierre Chalandon. "Détermination de la souplesse hors plan d’un assemblage de composites boulonnés à l’aide d’une démarche d’homogénéisation". Matériaux & Techniques 106, n. 3 (2018): 302. http://dx.doi.org/10.1051/mattech/2018052.

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Dans de nombreux secteurs industriels, les matériaux composites tissés à fibres de carbone et matrices thermoplastiques semblent être une alternative prometteuse aux matériaux métalliques pour alléger les structures. Les matrices composites thermoplastiques ont un coût plus adapté à la fabrication de pièces composites avec de grandes cadences. Les assemblages de structures peuvent être des jonctions mécaniques à base de rivets, de vis ou de boulons. Dans cette étude, nous proposons de développer une approche expérimentale et numérique pour identifier les souplesses hors plan des constituants élémentaires d’un assemblage boulonné. Il n’y a actuellement aucune règle de conception pour prédire la rupture des liaisons boulonnées constituées de substrats composites thermoplastiques. Par conséquent, une étude expérimentale d’une liaison boulonnée utilisant la technique de corrélation d’images est présentée. Simultanément, des modèles éléments finis tridimensionnels d’assemblages associés à une approche d’équivalence en énergie ont été développés afin de déterminer la souplesse des éléments de l’assemblage. Ces modèles éléments finis ont ensuite été comparés avec succès à des résultats expérimentaux.

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23

Bachmann, Sascha-Dominik, e Gerhard Kemp. "AGGRESSION AS “ORGANIZED HYPOCRISY?” – HOW THE WAR ON TERRORISM AND HYBRID THREATS CHALLENGE THE NUREMBERG LEGACY". Windsor Yearbook of Access to Justice 30, n. 1 (1 febbraio 2012): 233. http://dx.doi.org/10.22329/wyaj.v30i1.4365.

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Modern threats to international peace and security from so called “Hybrid Threats”, multimodal threats such as cyber war, low intensity asymmetric conflict scenarios, global terrorism etc. which involve a diverse and broad community of affected stakeholders involving both regional and international organisations/structures, also pose further questions for the existing legacy of Nuremberg. The (perhaps unsettling) question arises of whether our present concept of “war and peace”, with its legal pillars of the United Nations Charter’s Articles 2(4), 51, and the notion of the criminality of waging aggressive war based on the “legacy” of Nuremberg has now become outdated to respond to new threats arising in the 21st century. This article also serves to warn that one should not use the definition of aggression, adopted at the ICC Review Conference in Kampala in 2010, to repeat the most fundamental flaw of Nuremberg: ex post facto criminalisation of the (unlawful) use of force. A proper understanding of the “legacy of Nuremberg” and a cautious reading of the text of the ICC definition of aggression provide some markers for purposes of the debate on the impact of new threats to peace and security and the use of force in international law and politics.Les menaces modernes à la paix et à la sécurité internationales, par exemple les menaces dites « hybrides », les menaces multimodales comme la cyberguerre, les conflits asymétriques de faible intensité et le terrorisme mondial, qui impliquent un groupe vaste et diversifié d’intervenants provenant de structures et d’organismes régionaux ou internationaux, remettent en cause l’héritage du procès de Nuremberg. Se pose également la question (peut-être troublante) de savoir si la notion actuelle de « guerre et paix » ancrée juridiquement dans le paragraphe 2(4) et l’article 51 de la Charte des Nations Unies et la criminalisation de la guerre d’agression fondée sur l’« héritage » du procès de Nuremberg demeure encore pertinente en ce qui concerne la réponse aux menaces du 21e siècle. Le présent article sert également à prévenir qu’il ne faut pas utiliser la définition du terme « crime d’agression » adoptée à la Conférence de révision du Statut de Rome (ayant instauré la Cour pénale internationale (CPI)), qui a eu lieu à Kampala en 2010, pour reproduire la lacune la plus fondamentale du procès de Nuremberg : la criminalisation a posteriori du recours (illégal) à la force. Une compréhension adéquate de l’héritage du procès de Nuremberg et une lecture prudente de la définition du terme « crime d’agression » de la CPI fournissent des balises au débat sur l’incidence des nouvelles menaces à la paix et à la sécurité, ainsi qu’à l’utilisation de la force en politique et en droit internationaux.

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24

Calvert, Paul. "Biomimetic Ceramics and Composites". MRS Bulletin 17, n. 10 (ottobre 1992): 37–40. http://dx.doi.org/10.1557/s0883769400046467.

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An obvious parallel of structure and function exists between a rhinoceros and a tank, and between a beetle shell and the skin of an aircraft. We can also draw comparisons at the microstructural level between these biological and synthetic materials. Significant differences also exist, however, and the rigid biological materials such as bone and shell have much to teach us. In particular, they are distinctly composite structures. Although they bear loads in much the same way as synthetic composites or ceramics, they have far more complex architectures.The goal in considering the group of mineralized biological materials as described, for example, in the article by Fink et al. in this issue, and in devising modifications of them, which is the focus of this article and of Mann's, is to learn to devise arrangements of synthetic materials that work more efficiently than the homogeneous substances of simple composites that we use now. In addition to designing better microstructural arrangements we may also learn, again by analogy to the biological materials, how best to process these structures and how to recycle them after use.Biological structural materials are optimized for their high strength- or stiffness-to-weight ratio. Achieving this in synthetic materials for nonbiological application, for example in cars and airplanes, would be of obvious value. Our own interest here has focused on cuticle and bone as models for our synthetic work. Another property of biomineralized materials, for example biological ceramics, is their increased toughness. In this case we will discuss tooth enamel mimicking.

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Grail, Gaël, Martin Hirsekorn, Nicolas Carrère, Gilles Hivet e Ridha Hambli. "Chaîne multimodèle : lien entre paramètres matériaux/procédés et performances de structures composites à renfort tissé". Revue des composites et des matériaux avancés 21, n. 1 (aprile 2011): 79–91. http://dx.doi.org/10.3166/rcma.21.79-91.

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Chan, Helen M., Martin P. Harmer e Gary A. Miller. "Application of SEM to the study of multi-phase ceramic composites". Proceedings, annual meeting, Electron Microscopy Society of America 51 (1 agosto 1993): 946–47. http://dx.doi.org/10.1017/s0424820100150563.

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Recent on-going research at Lehigh has focussed on the tailoring of multi-phase ceramic composite structures for enhanced mechanical behavior. Results have shown that by suitable control of the morphology and nature of the phases present, improvements may be obtained in properties such as microstructural stability, flaw tolerance, and strength. What follows is a brief discussion of examples illustrating applications of scanning electron microscopy (SEM) to this type of study for several specific systems.Work by French et al. revealed that relative to single phase materials, duplex structures (which consist of ∼ 50:50 vol.% mixtures of mutually insoluble phases) show significantly enhanced resistance to grain coarsening. It was postulated that the slower grain growth rate in the duplex material resulted from the necessity for long-range diffusion. To test this hypothesis, the grain growth behavior of two duplex Al2O3:ZrO2 materials was compared, the difference being that a grain boundary glassy phase was deliberately incorporated into one of the structures.

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Djoudi, Tarek, Mabrouk Hecini, Daniel Scida, Youcef Djebloun e Belhi Guerira. "Caractérisation physique et mécanique du bois et des fibres issus d’une palme mûre de palmier dattier". Matériaux & Techniques 106, n. 4 (2018): 403. http://dx.doi.org/10.1051/mattech/2018056.

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La disponibilité en quantité importante des sous-produits renouvelable des palmiers dattiers laisse envisager leur utilisation comme renfort dans les matériaux composites et les structures d’isolation. Ceci nécessite la caractérisation physico-mécanique des différentes composantes du palmier. Dans ce contexte, cette étude a été entamée pour la caractérisation d’une composante importante du palmier qui est la palme mûre. La palme étant décomposée essentiellement en deux parties, le Pétiole et le Rachis, la caractérisation a été portée alors sur le bois fibreux et les fibres de ces deux parties. La caractérisation physique concernera la masse volumique des fibres et de la matrice végétale (lignine) ainsi que le taux d’humidité dans les différentes parties de la palme. Les essais mécaniques ont permis de déterminer les caractéristiques mécaniques du bois fibreux et des fibres extraites des deux parties de la palme après le séchage. À l’issue de cette étude, les résultats obtenus montrent l’influence de la position de l’échantillon testé sur les propriétés physico-mécaniques. Ils ont permis également de situer ce type de bois fibreux et ces fibres parmi d’autres résultats de la littérature scientifique et d’envisager de les utiliser dans la mise en œuvre des matériaux composites et dans des éléments d’isolation.

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BARIM, Esra. "Synthesis, Characterization, Optical and Thermal Properties of P(NVC-co-BZMA) Copolymer and Its ZnO Composites". Gazi University Journal of Science Part A: Engineering and Innovation 9, n. 4 (31 dicembre 2022): 526–36. http://dx.doi.org/10.54287/gujsa.1199767.

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Recent studies have paid particular attention to polymer-nanoparticle composite materials considering they have a number of interesting properties, which include optical, thermal, electrical, and others (Reyna-Gonzalez et al., 2009; Yakuphanoglu et al., 2010). In this study, a free radical polymerization process was used to create a copolymer of N-vinylcarbazole (NVC) and benzyl methacrylate (BZMA) at 25–75 mol% each. The procedure was conducted at 70°C with azobisisobutyronitrile (AIBN) acting as the initiator. Nano zinc oxide powders were then added to composites at three different ratios of 5%, 10%, and 15% weight of the copolymer. In order to better understand the structures of the P(NVC-co-BZMA) and its composites, FT-IR, 1H NMR, and UV spectroscopic techniques were also implemented. The optical characteristics of both the pure copolymer and its composites were examined. In the visible region, the composite containing 15% nano ZnO had the highest optical absorbance value. Additionally, the thermal behaviours of the composites and copolymers were analysed.

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Chatel, Sylvain, Stéphane Guinard e Serge Maison-Le Poëc. "Intégration de la simulation des procédés de fabrication : Besoins R et D liés aux structures composites EADS". Revue des composites et des matériaux avancés 15, n. 3 (23 dicembre 2005): 289–96. http://dx.doi.org/10.3166/rcma.15.289-296.

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Taillade, Frédéric. "Shearographie et thermographie appliquées à l’évaluation non destructive de renforts composites collés sur les structures en béton". Revue des composites et des matériaux avancés 22, n. 2 (31 agosto 2012): 237–65. http://dx.doi.org/10.3166/rcma.22.237-265.

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Passilly, Bruno, Benjamin Lamboul e Jean-Michel Roche. "Indentation haute fréquence : vers le contrôle non-destructif des structures". Matériaux & Techniques 105, n. 1 (2017): 110. http://dx.doi.org/10.1051/mattech/2017026.

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La nanoindentation est couramment utilisée pour déterminer les propriétés mécaniques locales des matériaux. La matière est sollicitée de façon quasi statique en appliquant un indenteur sur la surface à analyser. À partir de la courbe représentant la charge appliquée par l’indenteur sur le matériau en fonction du déplacement de l’indenteur, les modèles classiques permettent de déterminer le module d’Young local en tout point de test [Oliver & Pharr, AIP Conference proceedings 7 (1992) 1564-1583; Doerner & Nix, J. Mater. Res. 1 (1986) 601-609; Loubet et al., Vickers indentation curves of elastoplastic materials, in American Society for Testing and Materials STP 889, Microindentation Techniques in Materials Science and Engineering, Blau & Lawn eds, 1986, pp. 72-89]. Cet essai est surtout utilisé sur de petites surfaces de matière (<1 cm2), qui doivent présenter un état de surface poli et plan afin de ne pas fausser la mesure, mais n’est pas adapté sur des pièces de structure de type tôle ou sandwich composite (>1000 cm2). Par extension de la méthode CSM (Continuous Stiffness Measurement) [Asif et al., Rev. Sci. Instrum. 70 (1999) 2408-2413], l’indenteur peut servir de générateur de vibrations. Pour cela l’indenteur est positionné sur un empilement de céramiques piézoélectriques et est appliqué sur la surface à analyser à une charge fixe de 1000 mN. L’indenteur est soumis à une oscillation à une fréquence de 5 kHz, alimenté à 10 V. Les ondes ultrasonores ainsi générées, dites «ondes de Lamb», induisent un déplacement nanométrique de la surface, détectable par un vibromètre laser. Il est alors possible de suivre la propagation du front d’onde et de détecter ses interactions avec d’éventuels défauts de la structure inspectée [Boro Djordjevic, Quantitative ultrasonic guided wave testing of composites, The 39th Annual Review of Progress, 2013]. Il en résulte une cartographie complète de la surface. L’indenteur peut aussi être utilisé comme récepteur de l’onde générée. Le positionnement d’indenteurs récepteurs en plusieurs endroits de la structure permet de mesurer le temps de vol de l’onde entre l’indenteur émetteur et l’indenteur récepteur. La connaissance précise de la distance entre les points d’émission et de réception de l’onde permet de mesurer les vitesses en fonction de l’anisotropie du matériau, ce qui, à terme, peut permettre de remonter à ses constantes d’élasticité.

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Gnacadja, Claude, Armel Mouketou, Ephrem Nzangue, Chamfort Biroungou e Jacques François Mavoungou. "Analyse de Quelques Caractéristiques de la Filière Maraichage dans Trois Provinces du Gabon". European Scientific Journal, ESJ 18, n. 27 (31 agosto 2022): 296. http://dx.doi.org/10.19044/esj.2022.v18n27p296.

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La filière des cultures légumières est une composante importante de l'agriculture urbaine qui peut contribuer efficacement à la sécurité alimentaire. Cette étude vise à faire l’état des lieux de la filière maraichère au Gabon afin d’identifier les facteurs d’amélioration et de relance du secteur. Une enquête a été réalisée dans trois provinces (Estuaire, Ngounié et Wolleu Ntem) selon la méthode probabiliste aléatoire sur la base d’un questionnaire regroupant un ensemble de questions pour la collecte des informations. L’analyse des données a montré que l’activité maraichère est majoritairement pratiquée par les expatriés (87,87%) sur des sites de moins de 1 ha ; la plupart (53%) ayant une expérience de plus de 10 ans et des pratiques totalement manuelles. Soixante-cinq pour cent (65%) des producteurs enquêtés ont un âge compris entre 30 et 50 ans. Le maraichage non seulement constitue pour 79,61% des producteurs interviewés une source de revenus pour la famille, mais aussi contribue à 100% aux charges et dépenses de leur famille. Environ neuf pour cent (8,7%) seulement des acteurs sont membre d’une coopérative et 4% sont propriétaires terriens. Les semences utilisées proviennent des structures commerciales et le système d’association et de rotation de cultures est utilisé pour la gestion des cycles. Soixante-huit pour cent (68,44%) de ces producteurs ont pu installer des abris pour leur activité. Et 85,92% exercent leur activité sur financement propre. Concernant la production de tomate, les variétés utilisées généralement par les producteurs enquêtés sont des variétés hybrides F1 à croissance déterminé avec la variété Lindo retrouvée sur presque tous les sites de tomates. Les traitements (engrais ou produits phytosanitaires) diffèrent d’un producteur à un autre. La filière tomate ne possède aucun circuit organisé de gestion et transformation post récolte. Les tomates fraiches récoltées sont vendues sur place ou amenées vers le marché de proximité pour la vente. The vegetable crop sector is an important component of urban agriculture that can effectively contribute to food security. This study aims to take stock of the market gardening sector in Gabon in order to identify the factors for improving and reviving the sector. A survey was carried out in three provinces (Estuaire, Ngounié and Wolleu Ntem) according to the random probabilistic method on the basis of a questionnaire comprising a set of questions for the collection of information. Data analysis showed that market gardening is mainly practiced by expatriates (87.87%) on sites of less than 1 ha ; most (53%) having an experience of more than 10 years and totally manual practices. 65% of the producers surveyed are between 30 and 50 years old. Market gardening, not only constitutes (for 79.61% of the producers interviewed) their source of income for the family, but also contributes 100% to the expenses and expenses of the family. Only 8.7% of the producers are in a cooperative and 4% are installed on their personal (or family) domain. The seeds used come from commercial structures and the crop association and rotation system is used for cycle management. 68.44% of these producers were able to install shelters (greenhouses) for their activity. And 85.92% carry out their activity with own financing. Regarding tomato production, the varieties generally used by the producers surveyed are F1 hybrid varieties (with determined growth) with the Lindo variety found on almost all tomato sites. The treatments (fertilizers or phytosanitary products) differ from one producer to another. The tomato sector has no organized post-harvest management and processing circuit. The fresh tomatoes harvested are sold on site or transported to the local market for sale.

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Toure, Abdoulaye Abba, Gabrielle Kra, Rose Eholie, Josette Olivier-Fourcade e Jean-Claude Jumas. "Mise au point sur le système binaire TlTe et affinement des structures de TlTe et Tl5Te3". Journal of Solid State Chemistry 87, n. 1 (luglio 1990): 229–36. http://dx.doi.org/10.1016/0022-4596(90)90087-e.

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Berek, Harry, Christos G. Aneziris, Manuel Hasterok, Horst Biermann, Steffen Wolf e Lutz Krüger. "Stress Induced Phase Transformations in TRIP-Steel / Mg-PSZ Composites". Solid State Phenomena 172-174 (giugno 2011): 709–14. http://dx.doi.org/10.4028/www.scientific.net/ssp.172-174.709.

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Composite materials and micro- and macrostructure designs have been the focus of numerous scientific studies over the past few years according to their crashworthiness [1-3]. Crashworthiness is concerned with the absorption of energy through controlled failure mechanisms and modes that enable a defined load profile during energy absorption [4]. Cellular materials, such as metal foams, are materials which display a unique combination of physical and mechanical properties, e.g. for crash box applications. The defining characteristic of metal foams is a very high porosity, typically in the range of 70 to 90 vol. %. In principle, cellular metals can be manufactured from gas, liquid or solid phases and currently the most advanced methods involve melt-metallurgical processes [5]. Several groups have produced foam structures by using hollow spheres to form the cells of the material [5, 6]. These materials exhibited plateau stresses of 5 MPa and 23 MPa respectively, with volume specific energy absorptions SEA of 2 MJ/m3and 10 MJ/m3respectively, up to 50 % strain [6, 7]. By combining ceramics with ductile metals, failure-tolerant metal matrix composites (MMCs) can be created. With regard to application of the MMCs as wear resistant materials in metal forming tools a prolongation of the life time and the resultant reduced equipment downtimes have been achieved by active steel infiltrating of porous zirconia structures with the aid of Ti as activator [8]. A very promising approach concerning zirconia/steel - composite materials with superior mechanical properties has been demonstrated by Guo et al. using a low-alloyed TRIP steel in combination with an Y-PSZ – ceramic [9, 10]. In a previous study honeycomb structures were formed from composites of high-alloyed austenitic stainless TRIP-steel AISI 304 with Mg-PSZ with different mixing proportions due to ceramic extrusion at room temperature and sintering at 1350 °C for 2 h in an 99.9 % Argon atmosphere [11]. One of the most promising manufacturing route to produce open cell composite foams is based on the patent of Schwartzwalder [12] by the replication method using polyurethane sponge as a template. The polymer foam is impregnated in a powder slurry (this first coating contributes as an adhesive porous layer for further coating processes), the ceramic slurry is squeezed out of the functional pores and cold spray coatings are applied in order to eliminate defects out of the squeezing process and reach the critical wall thickness for acceptable mechanical properties. In [13] the authors reported about foams with 90 Vol% high alloyed TRIP-steel and 10 Vol% Mg-PSZ. Up to 50 % compressive strain a remarkable enhancement of the SEA was observed in comparison to comparable structures with TRIP-steel only.

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Vaidya, U. K., A. N. Palazotto e L. N. B. Gummadi. "Low Velocity Impact and Compression-After-Impact Response of Z-Pin Reinforced Core Sandwich Composites". Journal of Engineering Materials and Technology 122, n. 4 (21 aprile 2000): 434–42. http://dx.doi.org/10.1115/1.1289141.

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In the current work, sandwich composite structures with innovative constructions referred to as Z-pins, or truss core pins, are investigated. The Z-pin core sandwich construction offers enhanced transverse stiffness, high damage resistance, and multi-functional benefits. The present study deals with analysis of low-velocity impact (LVI) of Z-pin sandwich plate, and experimental studies of compression-after-impact characterization. Experimental studies on LVI of Z-pin sandwich plate considered in the analysis have been reported in Vaidya, et al., 1999, “Low Velocity Impact Response of Laminated Sandwich Composites with Hollow and Foam-Filled Z-Pin Reinforced Core,” Journal of Composites Technology and Research, JCTRER, 21, No. 2, Apr., pp. 84–97, where the samples were subjected to 11, 20, 28, 33, and 40 J of impact energy. The LVI analysis is developed with regards to Z-pin buckling as a primary failure mode (and based on experimental observations). A finite element model accounting for buckling of the pins has been developed and analyzed using ABAQUS. This paper also presents experimental results on compression-after-impact (CAI) studies which were performed on the sandwich composites with Z-pin reinforced core “with” and “without” foam. The experimental LVI tests were performed in Vaidya, et al., 1999, “Low Velocity Impact Response of Laminated Sandwich Composites with Hollow and Foam-Filled Z-Pin Reinforced Core,” Journal of Composites Technology and Research, JCTRER, 21, No. 2, Apr., pp. 84–97. The results indicate that selective use of Z-pin core is a viable idea in utilizing space within the core for sandwich composites in structural applications. [S0094-4289(00)02904-2]

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Putic, Slavisa, Marina Stamenovic, Branislav Bajceta, Predrag Stajcic e Srdjan Bosnjak. "Low-temperature tension properties of glass-epoxy composite materials". Acta Periodica Technologica, n. 36 (2005): 123–34. http://dx.doi.org/10.2298/apt0536123p.

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The aim of this paper was to present the determination of tensile strength Rm and modulus of elasticity Et of glass-epoxy composites at two different temperatures (at room temperature t=20?C, and at t =?50?C). Standard mechanical testing was carried out on glass woven-epoxy composite material with different structures (two specific weights of reinforcement, 210 g/m2 and 550 g/m2) and orientations (0?/90? and ?45?). Micromechanical analysis of failure was performed on a stereo microscope and SEM in order to determine real models and mechanisms of crack.

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Perrier, Antoine. "Décrire la pauvreté au Maghreb, des enquêtes de la période coloniale à la sociologie de l’indépendance (années 1930-1970)". Le Mouvement Social N° 283, n. 2 (5 dicembre 2023): 45–66. http://dx.doi.org/10.3917/lms1.283.0045.

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Cet article propose de décrire l’évolution des méthodes et des fonctions des enquêtes sociales au Maroc, en Algérie et en Tunisie des années 1930 aux années 1970, en se fondant sur un corpus de travaux publiés en français et en arabe. La mesure de la pauvreté au Maghreb évolue, du constat de sociétés traditionnelles où le bas niveau de vie est expliqué par l’immobilité des structures sociales vers une critique du sous-développement. Dès les années 1930, plusieurs facteurs expliquent ce changement de perception des écarts de revenu : le développement d’un savoir social en partie autonome de l’administration, l’élaboration d’outils de l’enquête directe, la nationalisation par la sociologie des enquêtes après les indépendances. Pour autant, la mesure de la pauvreté reste partielle et le champ des savoirs sur la société éclaté en différents domaines, notamment linguistiques. Ils ne convergent pas vers des tableaux plus synthétiques de « sociétés composites » théorisées par Paul Pascon dans les années 1960, mais montrent les nombreuses nuances au sein de ces sociétés, entre villes et campagnes ou entre chacun des trois pays.

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Chater, R., J. R. Gavarri e A. Hewat. "Structures isomorphes MeX2O4—Evolution structurale entre 2 K et 300 K de l'antimonite FeSb2O4: Elasticité et ordre magnétique anisotropes". Journal of Solid State Chemistry 60, n. 1 (novembre 1985): 78–86. http://dx.doi.org/10.1016/0022-4596(85)90166-5.

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Patel, Deepak K., e Anthony M. Waas. "Damage and failure modelling of hybrid three-dimensional textile composites: a mesh objective multi-scale approach". Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 374, n. 2071 (13 luglio 2016): 20160036. http://dx.doi.org/10.1098/rsta.2016.0036.

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This paper is concerned with predicting the progressive damage and failure of multi-layered hybrid textile composites subjected to uniaxial tensile loading, using a novel two-scale computational mechanics framework. These composites include three-dimensional woven textile composites (3DWTCs) with glass, carbon and Kevlar fibre tows. Progressive damage and failure of 3DWTCs at different length scales are captured in the present model by using a macroscale finite-element (FE) analysis at the representative unit cell (RUC) level, while a closed-form micromechanics analysis is implemented simultaneously at the subscale level using material properties of the constituents (fibre and matrix) as input. The N -layers concentric cylinder (NCYL) model (Zhang and Waas 2014 Acta Mech. 225 , 1391–1417; Patel et al. submitted Acta Mech. ) to compute local stress, srain and displacement fields in the fibre and matrix is used at the subscale. The 2-CYL fibre–matrix concentric cylinder model is extended to fibre and ( N −1) matrix layers, keeping the volume fraction constant, and hence is called the NCYL model where the matrix damage can be captured locally within each discrete layer of the matrix volume. The influence of matrix microdamage at the subscale causes progressive degradation of fibre tow stiffness and matrix stiffness at the macroscale. The global RUC stiffness matrix remains positive definite, until the strain softening response resulting from different failure modes (such as fibre tow breakage, tow splitting in the transverse direction due to matrix cracking inside tow and surrounding matrix tensile failure outside of fibre tows) are initiated. At this stage, the macroscopic post-peak softening response is modelled using the mesh objective smeared crack approach (Rots et al. 1985 HERON 30 , 1–48; Heinrich and Waas 2012 53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference, Honolulu, HI, 23–26 April 2012 . AIAA 2012-1537). Manufacturing-induced geometric imperfections are included in the simulation, where the FE mesh of the unit cell is generated directly from micro-computed tomography (MCT) real data using a code S impleware . Results from multi-scale analysis for both an idealized perfect geometry and one that includes geometric imperfections are compared with experimental results (Pankow et al. 2012 53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference, Honolulu, HI, 23–26 April 2012 . AIAA 2012-1572). This article is part of the themed issue ‘Multiscale modelling of the structural integrity of composite materials’.

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Poudereux, David, Manuel Cano-García, Domenico Alj, Roberto Caputo, Cesare Umeton, Morten Andreas Geday, José Manuel Otón e Xabier Quintana. "Recording Policryps structures in photonic crystal fibers". Photonics Letters of Poland 9, n. 1 (31 marzo 2017): 5. http://dx.doi.org/10.4302/plp.v9i1.700.

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Policryps structures of photo-curable adhesive NOA61 and nematic liquid crystal mixture E7 have been created inside selected microchannels of photonic crystal fibers (PCF). The PCF was selectively infiltrated with the photopolymer-liquid crystal mixture for the writing of a holographic tunable grating inside specific holes of the photonic fiber. A 2um pitch grating was successfully recorded in the PCF inner holes with and without collapsing the fiber cladding. The liquid crystal is properly aligned in both cases. Full Text: PDF ReferencesQ. Liu, et al., "Tunable Fiber Polarization Filter by Filling Different Index Liquids and Gold Wire Into Photonic Crystal Fiber", J. Lightwave Technol. 34(10), 2484 (2016). CrossRef L. Velázquez-Ibarra, A. Díez, E. Silvestre, M.V. Andrés, "Wideband tuning of four-wave mixing in solid-core liquid-filled photonic crystal fibers", Opt. Lett. 41(11), 2600 (2016). CrossRef T. Larsen, A. Bjarklev, D. Hermann, J. Broeng, "Optical devices based on liquid crystal photonic bandgap fibres", Opt. Express 11(20), 2589 (2003). CrossRef H.Y. Choi, M.J. Kim, B.H. Lee, "All-fiber Mach-Zehnder type interferometers formed in photonic crystal fiber", Opt. Express 15(9), 5711 (2007). CrossRef D. Poudereux, P. Corredera, E. Otón, J.M. Otón, X.Q. Arregui, "Photonic liquid crystal fiber intermodal interferometer" Opt. Pura Apl. 46(4), 321 (2013). CrossRef T.R. Woliński, et al., "Tunable Optofluidic Polymer Photonic Liquid Crystal Fibers", Mol. Cryst. Liq. Cryst. 619(1), 2 (2015). CrossRef D. Budaszewski, T.R. Woliński, M.A. Geday, J.M. Otón, "Photonic Crystal Fibers infiltrated with Ferroelectric Liquid Crystals", Phot. Lett. Poland, 2(3), 110 (2010). CrossRef D. Alj, S. Paladugu, G. Volpe, R. Caputo, C. Umeton, "Polar POLICRYPS diffractive structures generate cylindrical vector beams", Appl. Phys. Lett., 107(20), 201101 (2015). CrossRef A. Veltri, R. Caputo, C. Umeton, A.V. Sukhov, "Model for the photoinduced formation of diffraction gratings in liquid-crystalline composite materials", Appl. Phys. Lett. 84(18), 3492 (2004). CrossRef T.J. Bunning, L.V. Natarajan, V.P. Tondiglia, R.L. Sutherland, "Holographic Polymer-Dispersed Liquid Crystals (H-PDLCs)", Annu. Rev. Mater. Sci. 30(1), 83 (2000). CrossRef R. Caputo, L. De Sio, A.V. Sukhov, A. Veltri, C. Umeton, "Development of a new kind of switchable holographic grating made of liquid-crystal films separated by slices of polymeric material", Opt. Lett., 29, 1261 (2004). CrossRef A. Marino, F. Vita, V. Tkachenko, R. Caputo, C. Umeton, A. Veltri, G. Abbate, "Dynamical behaviour of holographic gratings with a nematic film --Polymer slice sequence structure", Euro. Phys. J. E 15, 47 (2004). CrossRef G. Abbate, F. Vita, A. Marino, V. Tkachenko, S. Slussarenko, O. Sakhno, J. Stumpe, "New Generation of Holographic Gratings Based on Polymer-LC Composites: POLICRYPS and POLIPHEM", Mol. Cryst. Liq. Cryst. 453(1), 1 (2006). CrossRef G. Zito, S. Pissadakis, "Holographic polymer-dispersed liquid crystal Bragg grating integrated inside a solid core photonic crystal fiber", Opt. Lett. 38(17), 3253 (2013). CrossRef B. Sun, et al., "Unique Temperature Dependence of Selectively Liquid-Crystal-Filled Photonic Crystal Fibers", IEEE Phot. Technol. Lett. 28(12), 1282 (2016). CrossRef R. Caputo, et al., "POLICRYPS: a liquid crystal composed nano/microstructure with a wide range of optical and electro-optical applications", J. Opt. A: Pure Appl. Opt. 11(2), 024017 (2009). CrossRef J. Li, S.-T. Wu, S. Brugioni, R. Meucci, S. Faetti, "Infrared refractive indices of liquid crystals", J. Appl. Phys. 97(7), 073501 (2005). CrossRef

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Shen, Ming-Yuan, Chen-Feng Kuan, Hsu-Chiang Kuan, Chia-Hsun Chen, Jia-Hong Wang, Ming-Chuen Yip e Chin-Lung Chiang. "Preparation, Characterization, Thermal, and Flame-Retardant Properties of Green Silicon-Containing Epoxy/Functionalized Graphene Nanosheets Composites". Journal of Nanomaterials 2013 (2013): 1–10. http://dx.doi.org/10.1155/2013/747963.

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In this investigation, silane was grafted onto the surface of graphene nanosheets (GNSs) through free radical reactions, to form Si-O-Et functional groups that can undergo the sol-gel reaction. To improve the compatibility between the polymer matrix and the fillers, epoxy monomer was modified using a silane coupling agent; then, the functionalized GNSs were added to the modified epoxy to improve the thermal stability and strengthen the flame-retardant character of the composites. High-resolution X-ray photoelectron spectrometry reveals that when the double bonds in VTES are grafted to the surfaces of GNSs. Solid-state 29Si nuclear magnetic resonance presents that the distribution of the signal associated with the T3structure is wide and significant, indicating that the functionalization reaction of the silicone in the modified epoxy and VTES-GNSs increases the network-like character of the structures. Thermal gravimetric analysis, the integral procedure decomposition temperature, and limiting oxygen index demonstrate that the GNSs composites that contained silicon had a higher thermal stability and stronger flame-retardant character than pure epoxy. The dynamic storage modulus of all of the m-GNSs containing composites was significantly higher than that of the control epoxy, and the modulus of the composites increased with the concentration of m-GNSs.

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Louër, Michèle, e Daniel Louër. "Synthèse et structures cristallines de Cs3MI4NO3 (M = Zn, Co, Cd): Un exemple de substitution sélective". Journal of Solid State Chemistry 65, n. 2 (novembre 1986): 272–79. http://dx.doi.org/10.1016/0022-4596(86)90063-0.

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43

Kelly, Richard. "Retraction: Tri-s-triazine (s-heptazine), a novel electron-deficient core for soft self-assembled supramolecular structures". Chemical Communications 56, n. 35 (2020): 4856. http://dx.doi.org/10.1039/d0cc90167a.

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Ran, Jingyu, Lihua Xiao, Wei Wang, Shaoyi Jia e Jihua Zhang. "Correction: ZIF-8@polyoxometalate derived Si-doped ZnWO4@ZnO nanocapsules with open-shaped structures for efficient visible light photocatalysis". Chemical Communications 54, n. 98 (2018): 13869. http://dx.doi.org/10.1039/c8cc90513d.

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Correction for ‘ZIF-8@polyoxometalate derived Si-doped ZnWO₄@ZnO nanocapsules with open-shaped structures for efficient visible light photocatalysis’ by Jingyu Ran et al., Chem. Commun., 2018, DOI: 10.1039/c8cc06077k.

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Barbes, H., G. Mascherpa, R. Fourcade e B. Ducourant. "Corrélations conductivité protonique—Structures dans le difluorure et le pentafluoroantimonate III d'hydrazinium: Structure cristalline de N2H6SbF5". Journal of Solid State Chemistry 60, n. 1 (novembre 1985): 95–100. http://dx.doi.org/10.1016/0022-4596(85)90168-9.

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Vilfayeau, Jerome, David Crépin, François Boussu, Damien Soulat e Philippe Boisse. "Numerical Modelling of the Weaving Process for Textile Composite". Key Engineering Materials 554-557 (giugno 2013): 472–77. http://dx.doi.org/10.4028/www.scientific.net/kem.554-557.472.

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Due to advancements made in 3D weaving process [1] and, in order to develop 3D textile structure as reinforcement of composite material for aeronautic application, a good prediction of the geometry and the mechanical properties of the 3D woven unit cell is required. Due to the complexity of these textile architectures, realistic geometric representations [2] of fabrics are often difficult to obtain especially for 3D woven fabrics, but these descriptions are necessary to define meshes for finite element computation [3]. At present, existing tools which model and define, early at a mesoscopic scale [4], the architecture of 3D fabrics don’t take into account the influence of the manufacturing process on the shape modification of the textile structure. Some numerical model exists for the braiding process [5] and the knitting process [6], but not yet for the weaving process. During the manufacturing process, fibres are subjected to significant deformations due to loads from the component of the loom or from the friction with the others fibres. These significant deformations lead to mechanical strength losses of the fabric. A numerical model of the different steps of the weaving process could predict these significant deformations and their influence on the geometry of the textile architecture. Thus, the objective of the NUMTISS project is to develop a numerical model of the deformation of the yarn during the weaving process. For the numerical modelling of the weaving process developed in finite element method, we considered all loom elements like rigid solid, and we will make the assumption that yarns are transverse isotropic elastic materials. Simulations of the process for a plain weave, a twill 2-2 and a satin 8 fabric have already been performed, as well as the simulation of orthogonal warp interlock structures. Then, to understand the kinematic motions of weaving process, the tracking of some strategic elements on the industrial weaving loom (reed, heddles, rapier,..) have been carried out. The tracking obtained from the video of the high speed camera will help us to define the numerical model of the weaving kinematic closer to reality. Correlations between numerical results and specific structures in glass fibres produced on the loom will be presented. The influence of each step of the manufacturing process on the characteristics of the textile structure could be analyzed [1]X. Chen, L. W. Taylor, L. J.Tsai. ”An overview on fabrication of three-dimensional woven textile preforms for composites”. Textile Research Journal, 2011, 81(9) 932–944 [2] SV Lomov, G Perie, DS Ivanov, I Verpoest and D Marsal. “Modeling three-dimensional fabrics and three-dimensional reinforced composites: challenges and solutions”. Textile Research Journal, 2011, 81(1) 28–41 [3] E. De Luycker, F. Morestin, P. Boisse, D. Marsal. « Simulation of 3D interlock composite performing”. Composite Structures, Volume 88, Issue 4, May 2009, Pages 615-623. [4] M. Ansar, W. Xinwei, Z. Chouwei. “Modeling strategies of 3D woven composites: A review”. Composite Structures 93 (2011) 1947–1963. [5] A. K. Pickett, J. Sirtautas, et A. Erber. « Braiding simulation and prediction of mechanical properties”. Applied Composite Materials, 2009. [6] M. Duhovic, D. Bhattacharyya. “Simulating the deformation mechanisms of knitted fabric composites”. Composites Part A : Applied Science and Manufacturing, 2006.

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Wang, Zhuguang, M. Daniela Morales-Acosta, Shanghao Li, Wei Liu, Tapan Kanai, Yuting Liu, Ya-Na Chen et al. "Correction: A narrow amide I vibrational band observed by sum frequency generation spectroscopy reveals highly ordered structures of a biofilm protein at the air/water interface". Chemical Communications 52, n. 68 (2016): 10440–41. http://dx.doi.org/10.1039/c6cc90360f.

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Abstract (sommario):

Correction for ‘A narrow amide I vibrational band observed by sum frequency generation spectroscopy reveals highly ordered structures of a biofilm protein at the air/water interface’ by Zhuguang Wang et al., Chem. Commun., 2016, 52, 2956–2959.

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Mahieddine, Ali, e Mohammed Ouali. "Analysis of Delaminated Composite Plates". Advanced Materials Research 686 (aprile 2013): 104–8. http://dx.doi.org/10.4028/www.scientific.net/amr.686.104.

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A mathematical model for plates with partially delaminated layers is presented to investigate their behavior. In this formulation account is taken of lateral strains. The principal advantage of the element is that it allows the modeling of delamination anywhere in the structure. The region without delamination is modeled to carry constant peel and shear stresses; while the region with delamination is modeled by assuming that there is no peel and shear stress transfer between the top and bottom layers. Numerical results of the present model are presented and its performance is evaluated for static problems. Laminated beams and plates are often used as primary load-carrying structures. However, the mechanical properties of composite materials may degrade severely in the presence of damage. One of the common types of damage modes in laminated composites is delamination. The presence of delamination is one of the most prevalent life-limiting failure modes in laminated composite structures. Many researchers had been studying the effect of delamination. Wee and Boay [1] developed an analytical model to predict the critical load of a delaminated composite laminated beam. Lee et al. [2] investigated the buckling behavior of the beam plate with multiple delaminations under compression. Kapania and Wolfe [3] examined the buckling behavior of a beam plate with two delaminations of equal length. Wang et al. [4] improved the analytical solution by including the coupling between the flexural and axial vibrations of the delaminated sub-laminates. Lee et al. [5] studied a composite beam with arbitrary lateral and longitudinal multiple delamination. Finite-element methods have been developed using the layerwise theory by Kim et al. [6]. Tan and Tong [7] developed a dynamic analytical model for the identification of delamination embedded in a laminated composite beam. To investigate the effects of delamination of a plate layers, a finite-element model is developed. Both displacement continuity and force equilibrium conditions are imposed between the regions with and without delamination. The accuracy of the approach is verified by comparing results with previously published data.

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Goiffon, Aline, Jean-Claude Jumas, Maurice Maurin e Etienne Philippot. "Etude comparée à diverses températures (173, 293 et 373°K) des structures de type quartz α des phases MIIIXVO4 (MIII = Al, Ga et XV = P, As)". Journal of Solid State Chemistry 61, n. 3 (marzo 1986): 384–96. http://dx.doi.org/10.1016/0022-4596(86)90047-2.

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50

KOMONHIRUN, Seekharin, Sujittra TANGPRAKOB, Sorawit CHANAPHAN, Awika JAROENSRI, Thanasak NILSONTHI e Thammaporn THUBLAOR. "Eddy current evaluation for thickness loss estimation of aluminum alloys used in aircraft structures". Journal of Metals, Materials and Minerals 33, n. 3 (8 agosto 2023): 1581. http://dx.doi.org/10.55713/jmmm.v33i3.1581.

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Aluminum alloys are commonly used in the aircraft industry but it tends to corrode and needs to be inspected properly. Eddy current testing is the widely used non-destructive testing (NDT) for aircraft metals. This research studied estimating the thickness loss due to corrosion in an aircraft aluminum sheet metal. The Al1100, Al2024, and Al7075 were 2 mm thick. Aluminum sheet metals were used to create artificial damage in hydrochloric acid. The thickness loss due to corrosion was inspected with eddy current testing (ET) and compared with the measurement from the coordinate measurement machine (CMM). The results showed that the thickness loss due to corrosion could be estimated using the eddy current skin depth frequencies. However, in the practical application, the skin depth could be guessed from the corrosion rate which could reduce the inspection time. In this research, the corrosion rate was measured by using potentiodynamic measurement. It can be used for estimating the thickness loss for an appropriate inspection interval.

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