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Artigos de revistas sobre o tema "Composites variables et anisotropes"

Autor: Grafiati
Publicado: 14 de setembro de 2024

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1

Ducret, D., R. El Guerjouma, M. Dubuget, and J. C. Baboux. "Caractérisation ultrasonore de l’élasticité et de l’endommagement anisotropes des matériaux composites." Matériaux & Techniques 88, no. 9-10 (2000): 3–7. http://dx.doi.org/10.1051/mattech/200088090003.

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2

Gavarri, J. R., P. Boher та A. W. Hewat. "Monoxyde PbOα(II): Élasticité et vibrations anisotropes; modélisation; constantes élastiques". Journal of Solid State Chemistry 58, № 1 (1985): 87–97. http://dx.doi.org/10.1016/0022-4596(85)90271-3.

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3

Hall, Richard B. "A Thermodynamic Framework for Viscoplasticity Based on Overstress (VBO)." Journal of Engineering Materials and Technology 127, no. 4 (2005): 369–73. http://dx.doi.org/10.1115/1.1924562.

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A thermodynamic framework is presented for the theory of Viscoplasticity Based on Overstress (VBO) developed by Krempl and co-workers (Krempl, E., and Ho, K., 2001, in Lemaitre Handbook of Materials Behavior Models, Academic Press, New York, pp. 336–348; 2000, in Time Dependent and Nonlinear Effects in Polymers and Composites, ASTM STP 1357, Schapery, R. A., and Sun, C. T., eds., ASTM, West Conshohocken, PA, pp. 118–137; Cernocky, E. P., and Krempl, E., 1979, Int. J. Non-Linear Mech., 14, pp. 183–203; Gomaa et al., 2004, Int. J. Solids Struct., 41, pp. 3607–3624), for anisotropic materials and
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Chater, R., J. R. Gavarri, and A. W. Hewat. "Évolution structurale sous pression de NiSb2O4: Compressibilités anisotropes et ordre magnetique." Journal of Solid State Chemistry 67, no. 1 (1987): 98–103. http://dx.doi.org/10.1016/0022-4596(87)90344-6.

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Chater, R., and J. R. Gavarri. "Evolution structure entre 2 et 300 K de l'oxyde MnSb2O4: Proprie´te´se´lastiques et magne´tiques anisotropes." Journal of Solid State Chemistry 59, no. 1 (1985): 123–31. http://dx.doi.org/10.1016/0022-4596(85)90359-7.

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Chater, R., J. R. Gavarri, and 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, no. 1 (1985): 78–86. http://dx.doi.org/10.1016/0022-4596(85)90166-5.

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7

Djibril, Oumar. "Examen de la Dette Extérieure Publique D’un Pays à Revenu Intermédiaire par une Approche D’indicateur de Sutenabilité: le cas de la Côte d’Ivoire." European Scientific Journal, ESJ 18, no. 28 (2022): 94. http://dx.doi.org/10.19044/esj.2022.v18n28p94.

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Cette étude examine la soutenabilité de la dette extérieure de la Côte d’Ivoire, pays à revenu intermédiaire avant et après son élection à l’IPPTE[1] en 2012, date cruciale de son histoire par l’approche de l’Indicateur de Soutenabilité de la Dette (ISD). Les résultats de l’étude montrent que son niveau d’endettement extérieur pose un problème de soutenabilité avant la période de l’atteinte du point d’achèvement mais relativement moins après. Le recours à la mesure de l’ISD fondé sur des variables socioéconomiques composites permet de conclure que la Côte d’Ivoire s’appauvrit empiriquement au
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8

Koadri, Zainate, Azzedine Benyahia, Nadir Deghfel, Kamel Belmokre, Brahim Nouibat, and Ali Redjem. "Étude de l’effet du temps de traitement alcalin de fibres palmier sur le comportement mécanique des matériaux à base d’argile rouge de la région de M’sila." Matériaux & Techniques 107, no. 4 (2019): 404. http://dx.doi.org/10.1051/mattech/2019031.

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Ce travail s’inscrit dans le développement de matériaux locaux, telle que la fibre végétale (fibre de palmier) et l’argile rouge du sud Algérien, largement utilisées dans la préparation des briques, comme matériaux de construction rurale. Les fibres végétales possèdent des propriétés très intéressantes, elles sont : renouvelables, biodégradables et le rapport coût/légèreté faible. Leurs propriétés mécaniques sont très importantes. Cependant, le problème prédominant dans ce type de matériaux composites est la faible adhésion de l’interface matrice-fibre, attribuée probablement, à la nature de l
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9

Shange, Musawenkosi G., Nduduzo L. Khumalo, Samson M. Mohomane, and Tshwafo E. Motaung. "Factors Affecting Silica/Cellulose Nanocomposite Prepared via the Sol–Gel Technique: A Review." Materials 17, no. 9 (2024): 1937. http://dx.doi.org/10.3390/ma17091937.

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Cellulose/silica nanocomposites, synthesised through the sol–gel technique, have garnered significant attention for their unique properties and diverse applications. The distinctive characteristics of these nanocomposites are influenced by a range of factors, including the cellulose-to-silica ratio, precursor concentration, pH, catalysts, solvent selection, temperature, processing techniques, and agitation. These variables play a pivotal role in determining the nanocomposites’ structure, morphology, and mechanical properties, facilitating tailoring for specific applications. Studies by Raabe e
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10

Atallah, Eyad, Lance F. Bosart, and Anantha R. Aiyyer. "Precipitation Distribution Associated with Landfalling Tropical Cyclones over the Eastern United States." Monthly Weather Review 135, no. 6 (2007): 2185–206. http://dx.doi.org/10.1175/mwr3382.1.

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Abstract Tropical cyclones (TCs) making landfall over the United States are examined by separating those associated with precipitation predominantly left of their tracks from those with the same to the right of their tracks. Composites of atmospheric variables for these two TC categories are performed and analyzed using potential vorticity (PV) and quasigeostrophic (QG) frameworks. Dynamical signatures are retrieved from these composites to help understand the evolution of precipitation in these storms. Results indicate that a left of track precipitation distribution (e.g., Floyd 1999) is char
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11

Duveiller, Gregory, Federico Filipponi, Sophia Walther, et al. "A spatially downscaled sun-induced fluorescence global product for enhanced monitoring of vegetation productivity." Earth System Science Data 12, no. 2 (2020): 1101–16. http://dx.doi.org/10.5194/essd-12-1101-2020.

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Abstract. Sun-induced chlorophyll fluorescence (SIF) retrieved from satellite spectrometers can be a highly valuable proxy for photosynthesis. The SIF signal is very small and notoriously difficult to measure, requiring sub-nanometre spectral-resolution measurements, which to date are only available from atmospheric spectrometers sampling at low spatial resolution. For example, the widely used SIF dataset derived from the GOME-2 mission is typically provided in 0.5∘ composites. This paper presents a new SIF dataset based on GOME-2 satellite observations with an enhanced spatial resolution of 0
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12

Tutum, Cem C., Ismet Baran, and Jesper Hattel. "Utilizing Multiple Objectives for the Optimization of the Pultrusion Process Based on a Thermo-Chemical Simulation." Key Engineering Materials 554-557 (June 2013): 2165–74. http://dx.doi.org/10.4028/www.scientific.net/kem.554-557.2165.

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Pultrusion is one of the most effective manufacturing processes for producing composites with constant cross-sectional profiles. This obviously makes it more attractive for both researchers and practitioners to investigate the optimum process parameters, i.e. pulling speed, power and dimensions of the heating platens, length and width of the heating die, design of the resin injection chamber, etc., to provide better understanding of the process, consequently to improve the efficiency of the process as well the product quality. Numerous simulation approaches have been presented until now. Howev
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13

Ayeni, A. O., M. Adegbenro, O. E. Dick, E. S. Oyedokun, I. O. Olasehinde, and J. O. Agbede. "Performance, haemato-biochemical indices and antioxidants status of broiler chickens fed diets supplemented with avocado-bamboo composite leaf mix." Nigerian Journal of Animal Production 49, no. 1 (2022): 293–303. http://dx.doi.org/10.51791/njap.v49i1.3428.

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Phytogenic feed additives have been suggested to augment nutrient utilization in the gastrointestinal tract by enhancing production of digestive secretions and enzymatic activity. Such effects on gastrointestinal morphology have been postulated to increase the nutrient digestibility in poultry. However, research on avocado—bamboo composite mix on broiler chickens are limited, this thus forms the focus of this study.A six week feeding trial was conducted to evaluate the growth, haemato-biochemical indices and antioxidants status of broiler chickens fed varying levels of composite leaf mix (CLM)
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14

Klein, François, Nerilie J. Abram, Mark A. J. Curran, et al. "Assessing the robustness of Antarctic temperature reconstructions over the past 2 millennia using pseudoproxy and data assimilation experiments." Climate of the Past 15, no. 2 (2019): 661–84. http://dx.doi.org/10.5194/cp-15-661-2019.

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Abstract. The Antarctic temperature changes over the past millennia remain more uncertain than in many other continental regions. This has several origins: (1) the number of high-resolution ice cores is small, in particular on the East Antarctic plateau and in some coastal areas in East Antarctica; (2) the short and spatially sparse instrumental records limit the calibration period for reconstructions and the assessment of the methodologies; (3) the link between isotope records from ice cores and local climate is usually complex and dependent on the spatial scales and timescales investigated.
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15

Kenney, Lauren E., Jared Tanner, Samuel J. Crowley, et al. "22 Cognitive Reserve's Relationship to Brain Burden in Parkinson's Disease Without Dementia." Journal of the International Neuropsychological Society 29, s1 (2023): 539–40. http://dx.doi.org/10.1017/s1355617723006938.

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Objective:Individuals with Parkinson's disease (PD) have varying trajectories of cognitive decline. One reason for this heterogeneity may be "cognitive reserve": where higher education/IQ/current mental engagement compensates for increasing brain burden (Stern et al., 2020). With few exceptions, most studies examining cognitive reserve in PD fail to include brain metrics. This study's goal was to examine whether cognitive reserve moderated the relationship between neuroimaging indices of brain burden (diffusion free water fraction and T2-weighted white matter changes) and two commonly impaired
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16

Gowtham, G. K., H. Somashekarappa, and R. Somashekar. "Third-order nonlinearity and functional data analysis of ADP-doped PVA/PVP polymer composites." International Journal of Modern Physics B, June 17, 2023. http://dx.doi.org/10.1142/s021797922450231x.

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The structural dependence of nonlinear optical properties associated with ADP-doped PVA/PVP polymer composites is discussed in this work. Polymer composites are fabricated using the solution casting method. X-ray diffraction (XRD) was used to perform structural analysis on these samples whose average crystallite size increases with an increase in dopant concentration. Results from UV–Vis–NIR spectra show that the samples are transparent in the IR region. The Z-scan technique was established by following the method described by Sheik-Bahae et al. The shape of the open aperture plot suggests tha
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17

R., Ranjith, and S. Nalin Vimalkumar. "Integrated MOORA-ELECTRE approach for solving multi-criteria decision problem." World Journal of Engineering ahead-of-print, ahead-of-print (2021). http://dx.doi.org/10.1108/wje-12-2020-0656.

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Purpose The most difficult tasks in the design and development of products for diverse engineering applications were the selection of suitable materials. Choice of inappropriate process variables leads to poor performance, which increases the cost of the product. The selection of the best option of available alternatives is important to improve the performance and productivity of the manufacturing enterprises. Design/methodology/approach The paper aims to develop Hybrid Multi-Criteria Decision Making (HMCDM) by integrating two potential optimization techniques Elimination Et Choix Traduisant l
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18

Amaral, Rafaela de Oliveira, Armando Lopes Moreno, Wallison Angelim Medeiros, and Guilherme Aris Parsekian. "Residual mechanical resistance of concrete blocks and laying mortars after high temperatures." Fire and Materials, December 13, 2023. http://dx.doi.org/10.1002/fam.3186.

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AbstractThis paper reports an experimental campaign to evaluate the residual mechanical resistance after high temperatures of two structural masonry components: block and mortar. Residual compressive strength and deformation modulus of four different hollow concrete blocks and two different mortar mixes after heating at high temperatures are investigated. The test method used was the one recommended by RILEM TC 200 for mortars and an adaptation of the same method proposed by Medeiros et al. suitable for the geometry of hollow blocks. Despite the sharp drop in the deformation modulus after heat
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19

Nambirajan, J., D. Vinoth Kumar, and D. Chakkravarthy. "MYOCARDIAL PERFORMANCE INDEX AS AN ECHOCARDIOGRAPHIC PREDICTOR OF EARLY HEART FAILURE IN ACUTE ST ELEVATION MYOCARDIAL INFARCTION." INTERNATIONAL JOURNAL OF SCIENTIFIC RESEARCH, September 1, 2022, 65–66. http://dx.doi.org/10.36106/ijsr/1201969.

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Myocardial infarction causes variable degrees of left ventricular (LV) systolic and diastolic dysfunctions. The ejection fraction (EF) and transmitral ow are the frequently used method for evaluating the systolic and diastolic functions respectively with considerable limitations. The MPI is a single independent parameter, capable of estimating both systolic and diastolic performance combined and lacks such limitations. We enrolled 100 patients presented with a rst acute STEMI who have undergone Thrombolysis. Echocardiography was done within 24 h of chest pain with measurement of MPI. The LV
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