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Journal articles on the topic 'Indice composite'

Author: Grafiati

Published: 1 June 2024

Last updated: 31 July 2025

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1

Sjahriza, Ahmad, Zainal Alim Mas’ud, and Komar Sutirah. "Mechanical and Barrier Properties of PVP-Carbon Dot Nanocomposite Films." Jurnal Kimia Terapan Indonesia 20, no. 2 (2019): 49–56. http://dx.doi.org/10.14203/jkti.v20i2.392.

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This research reported carbon dot were synthesized form citric acid and urea through a single step microwave process and Poly Vinyl Pirrolidone (PVP) films composited by carbon dot were prepared. The effects of different composition carbon dots on mechanical strength of films and water vapour barrier were evaluated. Highest mechanical yielded composite film were analyzed their thermal stability. Average of carbon dot diameter was found 90.61 nm and polydispersity indice 0.396. Different composition carbon dot exhibit significant improvement in tensile strength and modulus. Water permeablity of

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Lamia, B., L. C. Molano, C. Viacroze, A. Cuvelier, and J. F. Muir. "Pertinence d’un indice composite échocardiographique pour améliorer le dépistage de l’hypertension pulmonaire." Revue des Maladies Respiratoires 31 (January 2014): A26. http://dx.doi.org/10.1016/j.rmr.2013.10.070.

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3

Valayden, Ananda, and Didier Chabaud. "Un nouvel indice composite pour évaluer la performance environnementale des grandes entreprises." Recherches en Sciences de Gestion 164, no. 5 (2024): 293–321. https://doi.org/10.3917/resg.164.0293.

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Gaujoux-Viala, Cécile, Gaël Mouterde, Athan Baillet, et al. "Évaluation de l’activité de la polyarthrite rhumatoïde, quel indice composite faut-il utiliser ?" Revue du Rhumatisme 76 (December 2009): S3—S10. http://dx.doi.org/10.1016/s1169-8330(09)72764-4.

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Bouffard1, Léandre, and Micheline Dubé. "L’inégalité de revenus : un « virus » qui affecte la santé mentale et le bonheur." Mosaïque 38, no. 2 (2014): 215–33. http://dx.doi.org/10.7202/1023997ar.

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L’objectif du présent texte est de démontrer les effets de l’inégalité de revenus sur la santé mentale et le bonheur dans les pays riches. La première section fait état du niveau élevé d’inégalité de revenus aux États-Unis et, à un degré moindre, dans les autres pays riches. Les résultats présentés dans la seconde partie font voir des corrélations positives de l’inégalité de revenus avec la maladie mentale, avec un indice de consommation de drogues et avec un indice composite de 10 problèmes psychosociaux. De plus, il existe une corrélation négative entre l’inégalité de revenus et un indice de

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Jonnaert, Philippe, and Dany Laveault. "Évaluation de la familiarité de la tâche : quelle confiance accorder à la perception de l’élève?" Articles 20, no. 2 (2007): 271–91. http://dx.doi.org/10.7202/031710ar.

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Résumé Notre étude s'inscrit dans le courant des recherches sur la perception de la tâche par rélève. Plus spécifiquement, nous avons cherché à déterminer si les élèves d'une même classe sont capables d'autoévaluer avec fidélité la familiarité d'une tâche qui leur est proposée. Les résultats obtenus confirment que les élèves s'entendent entre eux pour juger de la familiarité d'une situation didactique et que les indicateurs sur lesquels ils se prononcent sont suffisamment homogènes pour permettre le calcul d'un indice composite, le facteur K.

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Guillaumin, Cyriac. "Zones monétaires optimales et (a)symétrie des chocs en Asie." Économie appliquée 61, no. 2 (2008): 121–51. http://dx.doi.org/10.3406/ecoap.2008.1880.

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L’objectif de cette étude est de montrer si l’Asie présente les caractéristiques d’une zone monétaire optimale (ZMO). Pour cela nous procédons de deux manières. (1) Nous construisons un indice composite de ZMO. (2) Nous analysons la volatilité des taux de change réels afin de définir la nature des chocs. Au vu de l’équation estimée, l’Asie remplirait les conditions d’une ZMO. La volatilité des taux de change réels fait, quant à elle, apparaître des chocs asymétriques. Nous montrons aussi que ces deux méthodes sont sujettes à discussion et qu’elles doivent être utilisées avec précaution.

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Lucic, Nicolas, and Jean-François Hoarau. "Le statut politique des petites économies insulaires a-t-il une influence sur leurs performances de développement ?" Mondes en développement 204, no. 4 (2024): 17–34. http://dx.doi.org/10.3917/med.204.0017.

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L’objectif de cet article est de comparer les performances macroéconomiques de développement d’un ensemble de 80 petits territoires insulaires à l’aune de leur statut politique et du degré de souveraineté atteint. Nous construisons quatre profils institutionnels (intégration complète, autonomie, souveraineté limitée et souveraineté totale) à partir d’un indice composite modifié de souveraineté proposé par Alberti et Goujon (2020). Ensuite, nous réalisons des tests de comparaison de moyenne sur 26 critères. Au final, nous trouvons que les dépendances insulaires autonomes sont plus économiquemen

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Wister, Andrew, Theodore Cosco, Barbara Mitchell, Verena Menec, and Ian Fyffe. "Development and Concurrent Validity of a Composite Social Isolation Index for Older Adults Using the CLSA." Canadian Journal on Aging / La Revue canadienne du vieillissement 38, no. 02 (2019): 180–92. http://dx.doi.org/10.1017/s0714980818000612.

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RÉSUMÉL’isolement social a retenu l’attention des chercheurs, en particulier dans la recherche concernant les personnes âgées, étant donné les corrélations établies avec la mortalité et le risque de mauvaise santé physique ou mentale. Toutefois, les mesures utilisées jusqu’à maintenant pour l’isolement social ont grandement varié et manquent souvent de clarté conceptuelle. La présente étude s’appuie sur un cadre conceptuel de classification des mesures d’isolement social et explique l’élaboration et la validation d’un indice composite d’isolement social (ELCV-SII) qui a été créé en utilisant l

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Carbonara, Pierluigi, Teresa Silecchia, Maria Spedicato, Alessandra Acrivulis, and Giuseppe Lembo. "A GEOSTATISTICAL APPROACH TO THE ASSESSMENT OF THE SPATIAL DISTRIBUTION OF PARAPENAEUS LONGIROSTRIS (LUCAS, 1846) IN THE CENTRAL-SOUTHERN TYRRHENIAN SEA." Crustaceana 72, no. 9 (1999): 1093–108. http://dx.doi.org/10.1163/156854099504040.

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AbstractThe spatial distribution of the abundance indices of the deep-water rose shrimp Parapenaeus longirostris was investigated applying geostatistical techniques on data collected in the central southern Tyrrhenian Sea from bottom trawl surveys carried out in the autumn since 1994. Experimental variograms (auto and cross) were constructed on the variable "abundance index", expressed in kg/km2, and those variogram models best describing the spatial continuity were detected and validated by the jackknife technique. The spatial structure of the "abundance index", exhibiting a similar pattern t

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Garnier, P., B. Tran, V. Salomon, and V. Drouvot. "P4-1 - Élaboration d’un indice composite des activités de lutte contre les infections nosocomiales dans les établissements de santé : ICALIN." Revue d'Épidémiologie et de Santé Publique 54 (August 2006): 73. http://dx.doi.org/10.1016/s0398-7620(06)76903-6.

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Noreau, Luc, Patrick Fougeyrollas, Julie Tremblay, Serge Dumont, and Myreille St-Onge. "Les facteurs personnels et environnementaux associés à l’appauvrissement des personnes ayant des incapacités : utilisation d’un indice composite : « revenu x participation sociale »." Santé, Société et Solidarité 4, no. 2 (2005): 165–80. http://dx.doi.org/10.3406/oss.2005.1068.

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Simard, Majella. "La géographie des disparités économiques au sein des localités du Canada atlantique : une étude comparative au cours de la période 1981–2006." Études, no. 27 (December 15, 2016): 83–117. http://dx.doi.org/10.7202/1038349ar.

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En dépit de ses nombreux éléments de similitude liés notamment à la faiblesse de l’armature urbaine, à une économie fortement orientée vers la mise en valeur des ressources et à une démographie qui peine à se renouveler, le Canada atlantique se présente comme un milieu fort hétérogène. Cette diversité entraîne des niveaux différents de développement selon les endroits. Bien que, de façon générale, les disparités économiques aient eu tendance à s’atténuer au cours des 25 dernières années, il n’en demeure pas moins que plusieurs localités sont aux prises avec des problèmes aigus d’emploi et de f

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Sweeney-Magee, Molly, Carolyn Gotay, Mohammad Ehsanul Karim, Jennifer Telford, and Trevor Dummer. "Tendances et déterminants de l’adhésion aux recommandations en matière de prévention primaire et secondaire du cancer colorectal dans le cadre du BC Generations Project." Promotion de la santé et prévention des maladies chroniques au Canada 42, no. 2 (2022): 89–104. http://dx.doi.org/10.24095/hpcdp.42.2.04f.

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Introduction L’adhésion aux recommandations en matière de prévention du cancer peut grandement réduire le risque de cancer colorectal. Cette étude porte sur les tendances et les déterminants de l’adhésion à ces recommandations par les participants (n = 26 074) au début d’une étude de cohorte en Colombie‑Britannique (Canada). Méthodologie Nous avons mesuré l’adhésion à cinq comportements de prévention primaire du cancer colorectal tirés des recommandations émises par la Société canadienne du cancer et le Fonds mondial de recherche contre le cancer (absence de tabagisme, indice de masse corporel

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Guataquí, Juan Carlos, Nohora Forero, and Andrés Felipe García. "¿A quiénes afecta el desempleo? Análisis de la tasa de incidencia en Colombia." Lecturas de Economía, no. 70 (September 11, 2009): 109–36. http://dx.doi.org/10.17533/udea.le.n70a2257.

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La tasa de incidencia representa un indicador compuesto que tiene en cuenta el volumen de desempleados y su persistencia (duración). Su análisis permite caracterizar de forma más completa a quienes tienen una mayor probabilidad de entrar o permanecer en el desempleo. En este estudio encontramos que en Colombia existen diferencias significativas derivadas del análisis de la tasa de desempleo y de la tasa de incidencia; lo cual sugiere que detrás de la duración del desempleo se encuentran importantes elementos que se deben considerar en el análisis de la tipología del desempleo y la formulación

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16

S R, Swamy. "Study of Flexural Strength of Epoxy Composites Reinforced with Opuntia Ficus Indica Fibers." International Journal for Research in Applied Science and Engineering Technology 12, no. 12 (2024): 1414–22. https://doi.org/10.22214/ijraset.2024.66062.

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This study investigates the potential of Opuntia ficus indica (cactus) fiber as a reinforcing material in composite applications, particularly in combination with an epoxy matrix. Despite being a naturally abundant resource, cactus fiber remains underutilized in engineering. The research focuses on evaluating the flexural strength of cactus fiber-reinforced composites, with particular attention to how variations in fiber volume fraction influence bending strength. As a member of the Cactaceae family, which includes over 130 genera and nearly 1,500 species, cactus fiber offers a sustainable and

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Varun K S, Swamy S R, and Mohan Kumar G. "Study of Tensile Strength of Opuntia Ficus Indica Fiber Reinforced Epoxy Composites." International Research Journal on Advanced Engineering and Management (IRJAEM) 2, no. 12 (2024): 3436–41. https://doi.org/10.47392/irjaem.2024.0506.

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In this present study, naturally available opuntia ficus indica (cactus) fiber is used, as reinforcing material. Cactus fiber belongs to the family cactaceae, which is reported to contain about 130 genera and nearly 1500 species. Composite materials are replacing standard Engineering metals and alloys for many applications. Since it is abundantly available in nature and majority of it is getting wasted without being used as reinforcement in engineering applications. In this work the mechanical properties cactus fiber reinforced with epoxy matrix. And also investigated the effect of fiber volum

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Singha, Amar S., Balbir S. Kaith, and Aishwarya J. Khanna. "Synthesis and characterization of Cannabis indica fiber reinforced composites." BioResources 6, no. 2 (2011): 2101–17. http://dx.doi.org/10.15376/biores.6.2.2101-2117.

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This paper reports on the synthesis of Cannabis indica fiber-reinforced composites using Urea-Resorcinol-Formaldehyde (URF) as a novel matrix through compression molding technique. The polycondensation between urea, resorcinol, and formaldehyde in different molar ratios was applied to the synthesis of the URF polymer matrix. A thermosetting matrix based composite, reinforced with lignocellulose from Cannabis indica with different fiber loadings 10, 20, 30, 40, and 50% by weight, was obtained. The mechanical properties of randomly oriented intimately mixed fiber particle reinforced composites w

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Dolbin, Igor V., Gusein M. Magomedov, and Georgii V. Kozlov. "The Influence of Phases Division Surface in Nanocomposites Polymer/2D-Nanofiller on their Reinforcement Degree - The Percolation Model." Key Engineering Materials 869 (October 2020): 516–23. http://dx.doi.org/10.4028/www.scientific.net/kem.869.516.

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The simple percolation model, in which critical indices are defined by the form of a reinforcing component of nanostructured composite structure, was proposed for the description of reinforcement degree for nanostructured composites polymer/2D-nanofiller. The indicated critical indices are close by absolute values to standard percolation indices. The form of reinforcing component controls the type of nanostructured composite. It has been shown that reinforcement degree of these nanomaterials is independent on modulus of elasticity of nanofiller, but is defined by its structure (aggregation lev

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Schmeling, M., A. Meyer-Filho, M. A. C. Andrada, and L. N. Baratieri. "Chromatic Influence of Value Resin Composites." Operative Dentistry 35, no. 1 (2010): 44–49. http://dx.doi.org/10.2341/09-44-l.

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Sosa, Edward D., Erica S. Worthy, and Thomas K. Darlington. "Microwave Assisted Manufacturing and Repair of Carbon Reinforced Nanocomposites." Journal of Composites 2016 (October 13, 2016): 1–9. http://dx.doi.org/10.1155/2016/7058649.

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We report a composite capable of advanced manufacturing and damage repair. Microwave energy is used to induce thermal reversible polymerization of the matrix allowing for microwave assisted composite welding and repair. Composites can be bonded together in just a few minutes through microwave welding. Lap shear testing demonstrates that microwave welded composites exhibit 40% bond strength relative to composites bonded with epoxy resin. Double cantilever beam testing shows 60% recovery in delamination strength after microwave assisted composite repair. The interfacial adhesion and composite re

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Roodman, David. "Composite indices." Journal of Economic Inequality 9, no. 3 (2011): 483–84. http://dx.doi.org/10.1007/s10888-011-9197-9.

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Kouadio Daouda, SOMAN, NDOUNIAMA ONIONGUI Van-Brentano, and HACHEMI Bentahar. "Développement financier : cas des pays de la zone UEMOA (Burkina Faso, Côte d’Ivoire et Mali)." International Journal of Financial Accountability, Economics, Management, and Auditing (IJFAEMA) 3, no. 4 (2021): 489–99. http://dx.doi.org/10.52502/ijfaema.v3i4.117.

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L’objet de ce papier est de connaître quel est le pays qui a le niveau de développement financier le plus élevé sur la période allant de 1975 à 2020. Pour se faire, nous avons utilisé l’analyse en composantes principales (ACP) afin d’avoir l’indice composite de chaque pays. Après comparaison des différents indices composites via l’ACP, les résultats montrent avec évidence que, pour le cas du Mali, la première valeur propre indique que la première composante principale explique plus de 71,509% de l’inertie totale (et plus de 74,564% respectivement 89,234%) pour la Côte d’Ivoire et le Burkina Fa

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Zhang, Peng, Qing-fu Li, Juan Wang, Yan Shi, and Yi-feng Ling. "Effect of PVA fiber on durability of cementitious composite containing nano-SiO2." Nanotechnology Reviews 8, no. 1 (2019): 116–27. http://dx.doi.org/10.1515/ntrev-2019-0011.

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Abstract In the current investigation, the influence of polyvinyl alcohol (PVA) fibers on flowability and durability of cementitious composite containing fly ash and nano-SiO2 was evaluated. PVA fibers were added into the composite at a volume fraction of 0.3%, 0.6%, 0.9%, and 1.2%. The flowability of the fresh cementitious composite was assessed using slump flow. The durability of cementitious composite includes carbonation resistance, permeability resistance, cracking resistance as well as freezing-thawing resistance, which were evaluated by the depth of carbonation, the water permeability h

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Gaurav, Kumar* Dr. Pardeep Gahlot** &. Dr. Rajesh**. "AN OVERVIEW OF COMPOSITE MATERIALS UNDER THERMAL AND IMPACT LOADING: PROPERTIES AND BEHAVIOUR." International Journal of Engineering Research and Modern Education (IJERME) 8, no. 2 (2023): 16–19. https://doi.org/10.5281/zenodo.8217246.

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Composite materials have gained significant attention in various industries due to their exceptional properties and versatility. Understanding the behavior of composite materials under thermal and impact loading is crucial for their effective utilization in real-world applications. Thermal loading involves examining the response of composites to temperature variations. Changes in temperature can induce thermal stress, expansion, and contraction within the material, affecting its mechanical properties and overall structural integrity. By comprehensively studying the thermal behavior of composit

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El Fallahi, Fadwa, Abdelmajid Ibenrissoul, and Youssef Bouazizi. "The effect of a company’s innovation and its leader’s personal characteristics on corporate environmental sustainability within the Moroccan context." Revue Management & Innovation N° 9, no. 3 (2024): 61–80. http://dx.doi.org/10.3917/rmi.209.0061.

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Dans un contexte de préoccupations environnementales croissantes, le lien entre l’innovation et la performance environnementale suscite une attention importante à la fois dans les milieux académiques et commerciaux. Des études récentes mettent en avant le rôle essentiel de l’innovation dans la résolution des défis environnementaux. Cependant, une analyse approfondie des preuves empiriques révèle une relation complexe. Cette étude vise à explorer la connexion entre l’innovation des modèles d’entreprise, la durabilité environnementale des entreprises et les caractéristiques personnelles des diri

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CADWALLADER, JS, Y. RUELLE, and H. VAILLANT. "BREVES DE MEDECINE." EXERCER 36, no. 211 (2025): 143–44. https://doi.org/10.56746/exercer.2025.211.143.

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Inégalités de bien-être et indice de développement humain L’indice de développement humain (IDH) est un indicateur composite évaluant l’espérance de vie, l’éducation et les revenus. Cependant, il ne prend pas en compte les inégalités internes aux pays. Cette étude a adapté l’IDH pour mesurer les disparités individuelles aux États-Unis selon l’origine ethnique, le sexe, l’âge et la localisation géographique. L’IDH individuel a été calculé à partir des années d’éducation, de la consommation des ménages et de l’espérance de vie estimée via des modèles bayésiens appliqués aux certificats de décès.

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Refaat, Eman, and Ali Hadi. "Constructing composite indices." International Journal of Sociology and Social Policy 38, no. 1/2 (2018): 58–86. http://dx.doi.org/10.1108/ijssp-12-2016-0135.

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Purpose The purpose of this paper is to construct, for the first time, composite index for Egypt that measures the economic and social rights fulfillment (ESRF) based on socioeconomic surveys at the household/individual levels. Design/methodology/approach The paper highlights some of the statistical debatable issues about composite indices and focuses mainly on six of them. Those issues are indicators selection, handling missing data, identification of and dealing with outliers, scale of measurement, computing the margin of error, weights assigned for indicators and domains and aggregation met

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Sethuraman, Balu, Sampath Pavayee Subramani, Sathish Kumar Palaniappan, Bhuvaneshwaran Mylsamy, and Karthik Aruchamy. "Experimental investigation on dynamic mechanical and thermal characteristics of Coccinia Indica fiber reinforced polyester composites." Journal of Engineered Fibers and Fabrics 15 (January 2020): 155892502090583. http://dx.doi.org/10.1177/1558925020905831.

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Due to superior material properties of fiber reinforced composites, they are utilized in many structural fabrications. Even though many studies have been reported about various fiber reinforced composites, it is indeed to find more eco-friendly composites for modern applications. So, developing the new fiber reinforced composites and revealing its mechanical properties are vital. In this examination, the natural fiber reinforced polymer matrix composite was prepared by compression molding method. The natural fiber named as Coccinia Indica was used to fabricate the fiber reinforced composites.

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Stelea, Lucia, Ioan Filip, Gabriela Lisa, et al. "Characterisation of Hemp Fibres Reinforced Composites Using Thermoplastic Polymers as Matrices." Polymers 14, no. 3 (2022): 481. http://dx.doi.org/10.3390/polym14030481.

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Hemp fibres used as a reinforcing agent and three polymeric matrices (polypropylene, bicomponent, recycled polyester) were used to obtain composite materials by needle punching and heat pressing. The influence of the hemp/matrix ratio and the nature of the matrix on the properties of the composites were analysed. The obtained composites were characterised by physical–mechanical indices, thermal analysis (thermogravimetry (TG), differential thermogravimetry (DTG) and Differential Scanning Calorimetry (DSC)), Fourier Transform Infrared Spectroscopy (FTIR-ATR) analysis, Scanning Electron Microsco

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Swain, Priyadarshi Tapas Ranjan, and Sandhyarani Biswas. "Influence of fiber surface treatments on physico-mechanical behaviour of jute/epoxy composites impregnated with aluminium oxide filler." Journal of Composite Materials 51, no. 28 (2017): 3909–22. http://dx.doi.org/10.1177/0021998317695420.

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The present paper discovers the effect of ceramic filler inclusion on physico-mechanical and water absorption behaviour of untreated and chemically treated (alkali and benzoyl chloride treated) bi-directional jute natural-fiber-reinforced epoxy composites. In practice, the major drawbacks of using natural fibers are their high degree of moisture absorption and poor dimensional stability. Currently, chemical treatments are able to induce fiber modifications that increase their resistance when utilized in composite products. Jute fibers were subjected to various chemical modifications to improve

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Dorairajan, Mukundan, Vikram Srinivas, Vasanthakumari Raju, and Gayathri Raghavan. "Temperature Dependent Electrical Properties of Green Synthesized Silver Nanoparticles-Polyaniline Composite." Advanced Materials Research 938 (June 2014): 230–35. http://dx.doi.org/10.4028/www.scientific.net/amr.938.230.

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Polyaniline (PANI) Nanocomposites are potential materials for actuators, EMI shielding, Fuel cells and components in non volatile memory. Silver nanoparticles have wide range of applications such as catalysis, microelectronics, biotechnology and silver-oxide batteries. This work reports the effect of thermal alteration [lowhigh temperatur on the electrical conductivity of green synthesized silver (Ag) nanoparticles-polyaniline composite. A simple low cost green synthesis using Azadirachta indica [Neem] extract is employed for synthesis of silver nanoparticles; Polyaniline is prepared by redox

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Alameri, A., I. Gutman, V. R. Kulli, A. Ayache, and M. Alsharafi. "Chemical Applications on General Zagreb Indices of Composite Graphs." international journal of mathematics and computer research 12, no. 03 (2024): 4114–18. http://dx.doi.org/10.47191/ijmcr/v12i3.06.

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A topological index is a quantity computed from the molecular graph, that finds application in chemistry, material science, computer science, and biological application-driven fields. Recently, the general Zagreb indices were studied, and methods for their calculation for composite graphs were established. In the present paper, we provide examples for chemical applications of these methods, computing the first and second general Zagreb indices of several composite molecular species, in particular of biphenyl, naphthalene, biphenylene, and bicoronylene. In this paper, we compute the Nirmala ind

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Mohd Ghazali, Aruan Efendy, and Kim L. Pickering. "The effect of fibre surface treatment and coupling agents to improve the performance of natural fibres in PLA composites." Journal of Polymer Engineering 41, no. 10 (2021): 842–53. http://dx.doi.org/10.1515/polyeng-2021-0120.

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Abstract This paper describes work carried out to assess the effect of fibre treatments and coupling agent on the mechanical performance of PLA composites reinforced with 20 wt% fibre. The chemically-treated harakeke and hemp fibres used to produce fibre mats. Maleic anhydride (MA) grafted PLA (MA-g-PLA) was used as a coupling agent. Composites with fibre treated with silane and dicumyl peroxide (DCP) and composites using MA-g-PLA were characterised by swelling testing, scanning electron microscopy (SEM), tensile testing, dynamic mechanical analysis (DMA) and thermogravimetric analysis (TGA).

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Abdul Khalil, H. P. S., M. M. Marliana, and Turki Alshammari. "Material properties of epoxy-reinforced biocomposites with lignin from empty fruit bunch as curing agent." BioResources 6, no. 4 (2011): 5206–23. http://dx.doi.org/10.15376/biores.6.4.5206-5223.

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Lignin was obtained from black liquor samples from soda-AQ pulping of oil palm empty fruit bunch (EFB) fiber. Oil palm EFB reinforced epoxy composite samples with varying lignin content of 15, 20, 25, and 30% as curing agent were prepared. The chemical structures of lignin were characterized by FT-IR, and CHN analysis. FT-IR and CHN analysis confirmed structural changes of epoxy resin after use of EFB-lignin as curing agent in epoxy resin. Thermal analysis of composites was carried out by thermogravimetric analysis (TGA). The TGA graphs showed that crosslinking of epoxy and lignin as curing ag

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Dougados, Maxime, Julien Lucas, Emilie Desfleurs, et al. "Impact of disease activity outcome measures reporting in the medical records of patients with axial spondyloarthritis on the retention rates of biological treatment: the example of secukinumab use in daily practice in France." RMD Open 8, no. 1 (2022): e002106. http://dx.doi.org/10.1136/rmdopen-2021-002106.

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ObjectivesTo estimate the frequency of reporting composite indices evaluating axial spondyloarthritis (axSpA) disease activity in daily practice and to assess its impact on the secukinumab (SEC) retention rate.MethodsStudy design: Retrospective, multicentre. Data collected: (1) Recommended composite indices: Bath Ankylosing Spondyltitis Disease Activity Index (BASDAI) +C reactive protein or Ankylosing Spondylitis Disease Activity Score (ASDAS) at the time of initiation of SEC and at least once during the first year of follow-up; (2) Drug retention rate: percentage of patients still on SEC over

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Sayyar, Mohammad, Anagi M. Balachandra, and Parviz Soroushian. "Energy absorption capacity of pseudoelastic fiber-reinforced composites." Science and Engineering of Composite Materials 21, no. 2 (2014): 173–79. http://dx.doi.org/10.1515/secm-2013-0021.

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AbstractPseudoelastic fiber-reinforced metal matrix composite with enhanced ductility and energy absorption capacity was developed. This composite system relies on the distributed nature of large pseudoelastic strains to mitigate localization of inelastic deformation and failure, and thus mobilizes a major fraction of volume for effective energy absorption. The pseudoelastic fibers were made of Ni-Ti-Cr alloy used in conjunction with two different matrices, aluminum and copper. Tension and pull-out tests were performed to evaluate the ductility and energy absorption capacity of control and pse

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Shamsuri, Ahmad Adlie, and Siti Nurul Ain Md Jamil. "Application of Quaternary Ammonium Compounds as Compatibilizers for Polymer Blends and Polymer Composites—A Concise Review." Applied Sciences 11, no. 7 (2021): 3167. http://dx.doi.org/10.3390/app11073167.

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A wide variety of quaternary ammonium compounds (QACs) have escalated the attraction of researchers to explore the application of QACs. The compounds have frequently been synthesized through alkylation or quaternization of tertiary amines with alkyl halides. Recently, QACs have been applied to compatibilize polymer blends and polymer composites in improving their thermo-mechanical properties. This concise review concentrates on the application of two types of QACs as compatibilizers for polymer blends and polymer composites. The types of QACs that were effectively applied in the blends and com

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Adams, L. A., E. R. Essien, and E. E. Kaufmann. "Mechanical and bioactivity assessment of wollastonite/PVA composite synthesized from bentonite clay." Cerâmica 65, no. 374 (2019): 246–51. http://dx.doi.org/10.1590/0366-69132019653742584.

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Abstract Glass/polymer composites can mimic the natural structure of bone by possessing a fiber-matrix configuration which provides appropriate physical and biological properties. Wollastonite ceramics are known for their promising bioactivity and biocompatibility when applied in bone regeneration. Polyvinyl alcohol (PVA) has various attractive properties including biocompatibility and degradability which may be exploited as a polymer matrix in composites for biomedical applications. Therefore, a cost-effective method of preparing wollastonite/PVA composites is desirable by starting from bento

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Shcherbakov, A. S., A. Z. Bekeshev, A. S. Mostovoy, S. V. Arzamastsev, B. O. Sarsenbaev, and M. S. Dosekenov. "The effect of a microwave electromagnetic field on the structure and properties of an unsaturated polyester composite filled with carbon nanotubes." Physics and Chemistry of Materials Treatment 3 (2024): 5–12. http://dx.doi.org/10.30791/0015-3214-2024-3-5-12.

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The effect of microwave electromagnetic field on properties of unsaturated polyester composite filled with carbon nanotubes (CNTs) has been studied. The quantity of CNT, at which the best indices of physical and mechanical characteristics are achieved, is chosen. The influence of microwave fields at various stages of formation of three-dimensional cross-linked structure of the composite was studied for the obtained compositions. The structure formation processes, the structure of the obtained composites and thermal stability were considered on the selected compositions.

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Hemdan, Bahaa A., Ahmed Mostafa, Marwa M. Elbatanony, et al. "Bioactive Azadirachta indica and Melia azedarach leaves extracts with anti-SARS-CoV-2 and antibacterial activities." PLOS ONE 18, no. 3 (2023): e0282729. http://dx.doi.org/10.1371/journal.pone.0282729.

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The leaves of Azadirachta indica L. and Melia azedarach L., belonging to Meliaceae family, have been shown to have medicinal benefits and are extensively employed in traditional folk medicine. Herein, HPLC analysis of the ethyl acetate fraction of the total methanolic extract emphasized the enrichment of both A. indica L., and M. azedarach L. leaves extracts with phenolic and flavonoids composites, respectively. Besides, 4 limonoids and 2 flavonoids were isolated using column chromatography. By assessing the in vitro antiviral activities of both total leaves extracts against Severe Acute Respi

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Ci, Shengzong, Baoming Wang, Chengrui Di, Mingyu Wang, Bo Zhu, and Kun Qiao. "Effect of Ultraviolet Aging on Properties of Epoxy Resin and Its Pultruded Fiber-Reinforced Composite." Polymers 17, no. 3 (2025): 294. https://doi.org/10.3390/polym17030294.

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Polymer matrix composites (PMCs) often undergo aging as a result of ultraviolet (UV) radiation, which significantly impacts their performance and durability. This paper investigated the alterations in the microstructure and macroscopic properties of epoxy resin and its composite used in overhead wires during UV aging. Furthermore, the mechanism of UV aging for both resin and composite was revealed. The results showed that UV aging predominantly affected the properties of the surface layer resin. UV aging can induce molecular chain scission, which leads to resin weight change, color deepening,

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Santos, Jaime, Paulo N. B. Reis, Mario Santos, and Ana M. Amaro. "Non-Destructive Evaluation of Impact-Damaged Sandwich Composites: Influence of Fiber Type." Journal of Composites Science 9, no. 2 (2025): 86. https://doi.org/10.3390/jcs9020086.

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This study deals with the evaluation of impact-damaged sandwich composites using different fiber types (carbon, glass, and Kevlar), where the outer layers, or “skins”, were made from the same type of fiber, while the inner layer, or “core”, consisted of a different fiber type, with the aim of improving the damage resistance and tolerance of composite materials. To achieve this goal, the following research question was formulated: can the type of core fiber used in sandwich composites primarily determine their structural response under impact? To obtain a consolidated answer, various configurat

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Kang, Hyoseop, Ki Hoon Kim, Geon Su Kim, Hyeseong Lee, Ji-un Jang, and Seong Yun Kim. "Synergistic enhancement in electrical conductivity of polymer composites simultaneously filled with multi-walled carbon nanotube and pitch-based carbon fiber via one-step solvent-free fabrication." Functional Composites and Structures 4, no. 1 (2022): 015008. http://dx.doi.org/10.1088/2631-6331/ac5d26.

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Abstract Recently, studies have been reported to synergistically improve the electrical conductivity of polymer composites by simultaneously incorporating hybrid fillers, but systematic studies on filler loading and ratio are still scarce. In this study, a one-step process was proposed to induce the incorporation of uniformly dispersed fillers with a high content, and synergistic improvement in the electrical conductivity of polymer composites was studied by applying two types of carbon fillers: nano-sized multi-walled carbon nanotube (MWCNT) and micro-sized pitch-based carbon fiber (PCF). Bas

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Zhao, Jian, Wei Li, Xin Dong, and Jiying Chen. "Material Properties of Strontium Doped Bioactive Glasses/Hydroxyapatite Composite and Its Mechanism of Promoting Bone Repair." Journal of Biomaterials and Tissue Engineering 11, no. 12 (2021): 2313–20. http://dx.doi.org/10.1166/jbt.2021.2853.

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Based on bioactive glasses (BG) of 58S, sol–gel method is used to prepare strontium oxide substituted bioactive glasses (SrO-BG) with different strontium content. SrO-BG and nano hydroxyapatite (HAp) composite materials were synthesized using precipitation method. The phase composition and morphologies of the prepared materials were examined by x-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques. The dissolution and bio-mineralization of SrO-BG and SrO-BG/HAp composites in SBF are investigated by immersion method. The effects of secretion components of macrophages regulat

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Lalunio-Manikan, Marilyn, Aldrin P. Bonto, and Carmelo Miguel H. Ebreo. "Nanosilver Immobilized in Carbonaceous Particles Derived from Hydrothermal Carbonization of Eleusine indica Leaf Extract." Trends in Sciences 18, no. 23 (2021): 681. http://dx.doi.org/10.48048/tis.2021.681.

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In this study, for the first time, hydrothermal treatment of Eleusine indica leaf extract and silver nitrate produced nanosilver immobilized in hydrothermal carbon synthesized at different reaction times (RT) - 6, 12, 24 and 48 h. The surface morphology of nanosilver hydrochar (AgNP@hydrochar) composites was studied using SEM, while their chemical functionalities were investigated using FT-IR, UV-Vis, XRF and EDX spectroscopy. The AgNP@hydrochar were observed to be agglomerated spherical particles with size ranges from 128 to 171 nm. Varying C=O and C=C IR absorption peaks at different RT sugg

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Yan, Hui, Liang Wang, Xiaoming Wang, et al. "Effects of Melt Hydrogenation on the Microstructure Evolution and Hot Deformation Behavior of TiBw/Ti-6Al-4V Composites." Materials 16, no. 6 (2023): 2496. http://dx.doi.org/10.3390/ma16062496.

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In this study, Ti-6Al-4V matrix composites reinforced with TiB ceramic whiskers were in situ synthesized and hydrogenated using the melt hydrogenation technique (MHT). The effects of MHT on the microstructure evolution and hot compression behavior of the composites were investigated by optical microscopy (OM), electron backscatter diffraction (EBSD), and transmission electron microscopy (TEM). Hot compression tests were performed at strain rates of 0.1/s, 0.01/s, and 0.001/s and temperatures of 800 °C, 850 °C, and 900 °C; the hot workability of composites significantly improved after hydrogena

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Sultana, S., HP Nur, T. Saha, and M. Saha. "Fabrication of raw and oxidized saw dust reinforced low density polyethylene (LDPE) composites and investigation of their physico-mechanical properties." Bangladesh Journal of Scientific and Industrial Research 47, no. 4 (2013): 365–72. http://dx.doi.org/10.3329/bjsir.v47i4.14065.

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In this research work, cellulosic waste mango (Mangifera indica) saw dust used as the reinforcing material with low density polyethylene (LDPE). A number of samples of saw dust reinforced low density polyethylene (LDPE) composites were prepared by compression moulding technique. In order to improve the mechanical properties of saw dust-LDPE composites, unbleached raw saw dust fibers were modified by oxidation using sodium hypochlorite. FT-IR spectroscopic and scanning electron micrograph (SEM) analyses were done and the results showed the evidence of positive oxidation reaction. The effects of

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Zhang, Hong Yan, Hai Quan Wang, Lin Tong Wang, and Yi Min Feng. "Electrical Conducting Properties of Unsaturated Polyester/Graphite Nanosheet Composite under Electric Field." Advanced Materials Research 455-456 (January 2012): 520–23. http://dx.doi.org/10.4028/www.scientific.net/amr.455-456.520.

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Unsaturated polyester resin/Graphite nanosheet composites were prepared using in situ polymerization under AC electric field which was applied during composite curing to induce orientation of graphite nanosheets. Scanning electron microscopy (SEM) has been applied to demonstrate the orientation of graphite nanosheets As a result, the percolation threshold was decreased to 0.25 wt% due to the orientation of the graphite nanosheets.

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Liu, Ting-Yu, Peng Zhang, Qing-Fu Li, Shao-Wei Hu, and Yi-Feng Ling. "Durability Assessment of PVA Fiber-Reinforced Cementitious Composite Containing Nano-SiO2 Using Adaptive Neuro-Fuzzy Inference System." Crystals 10, no. 5 (2020): 347. http://dx.doi.org/10.3390/cryst10050347.

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In this study, the durability of polyvinyl alcohol fiber-reinforced cementitious composite containing nano-SiO2 was evaluated using the adaptive neuro-fuzzy inference system (ANFIS). According to the structural characteristics of the cementitious composite material and some related standards, the classification criteria for the evaluation indices of cementitious composite materials were clarified, and a corresponding structural framework of durability assessment was constructed. Based on the hypothesis testing principle, the required test data capacity was determined under a certain degree of

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