Relevant bibliographies by topics / Fibre coton

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Academic literature on the topic 'Fibre coton'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Fibre coton"

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Bourgou, Larbouga, Windpouiré Vianney Tarpaga, Sidiki K. Diane, and Denys Sanfo. "Evaluation et sélection d’une variété de cotonnier (FK64, Gossypium hirsutum L.) au Burkina Faso." International Journal of Biological and Chemical Sciences 14, no. 3 (June 18, 2020): 869–82. http://dx.doi.org/10.4314/ijbcs.v14i3.18.

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Le coton du Burkina Faso est presqu’entièrement exporté ; les variétés cultivées doivent régulièrement répondre aux exigences du marché. Une fratrie de lignées de cotonnier a été comparée à deux variétés, FK37 et Stam 59A, respectivement dans les zones cotonnières humides et sèches de 2006 à 2009, pour mettre en exergue celle qui améliore les performances agronomiques et technologiques de fibre de ces témoins. A l’issue d’évaluations multilocales, FK64 et FK69 ont été identifiées comme de potentielles nouvelles variétés et testées en milieu paysan. Dans les zones humides, FK64 et FK69 n’ont pas apporté d’amélioration significative ; il est inopportun de les y vulgariser. Dans les zones sèches, FK64 a le mieux performé et a été retenue pour y être vulgarisée. Elle apporte un surplus en pourcentage fibre (+ 0,41%) et en seed index (+ 0,35 g). Aussi, elle apparait meilleure que Stam 59A pour la longueur (+ 1,44 mm) et la ténacité (+ 1,90 g/tex), deux caractéristiques déterminantes du marketing de la fibre. Avec la suspension du coton Bt et le retour à la culture conventionnelle, FK64 lancée en culture commerciale a convaincu. Elle pourrait être candidate à la transformation en cas de retour dans la technologie Bt.Mots clés: Evaluations multilocales, tests variétaux, caractéristiques agronomiques, caractéristiques technologiques, Burkina Faso. English Title: Assessment and selection of a cultivar of cotton (FK64, Gossypium hirsutum L.) in Burkina Faso Cotton produced in Burkina Faso is almost entirely exported; so cultivars must be developed following the market demand. A sibling of cotton lines was compared to two varieties, FK37 and Stam 59A, respectively in humid and dry cotton production areas between 2006 and 2009 to highlight which one enhances agronomic and fiber quality performances compared to the local control. After multilocation trials, FK64 and FK69 were highlighted as promising news varieties then evaluated under farmer’s conditions of production. In the humid areas, FK64 as well as FK69 did not bring any significant improvement; it was not recommended to release any of them there. In the dry production areas, FK64 performed better, then it was retained to be possibly popularized. It brings a surplus in terms of ginning out turn (+ 0,41%) and seed index (+ 0,35 g). Moreover, it outperformed Stam 59A in fiber length (+ 1,44 mm) and strength (+ 1,90 g/tex), two major cotton fiber marketing properties. At the morrow of the suspension of the Bt cotton and back to conventional production, FK64 was launched in commercial production and it convinced. It could be aspirant to Bt introgression in case country resumes back to the technology.Keywords: multilocation trials, varietal trials, agronomical characteristics, fiber properties, Burkina Faso.
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Dugué, Patrick, Edmond N. Kohio, and Justin Tiemtoré. "L’agriculture burkinabè face à la crise de la Covid-19 : cas des régions du Yatenga et des Hauts-Bassins." Cahiers Agricultures 30 (2021): 16. http://dx.doi.org/10.1051/cagri/2021002.

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Au début de la crise sanitaire due à la Covid-19, certains observateurs ont alerté les décideurs d’une possible crise alimentaire dans les mois à venir en Afrique de l’Ouest. En vue d’alimenter ce débat, nous avons mené une étude en nous entretenant avec 75 acteurs du secteur agricole dans deux régions du Burkina Faso − le Yatenga et les Hauts-Bassins. Dans les deux situations, les agriculteurs et les éleveurs ont pu continuer leurs activités mais certains ont eu des difficultés de commercialisation. Les maraîchers et les arboriculteurs ont été les plus touchés par cette crise du fait des difficultés à écouler leurs produits périssables sur les marchés ouest-africains. Les éleveurs ont été moins concernés par la baisse des prix mais les commerçants de bétail sur pied ont aussi rencontré des difficultés à exporter vers les pays côtiers. Enfin, les sociétés cotonnières ont dû faire face à une baisse du prix international du coton-fibre et les producteurs de coton ont dû faire face à une baisse du prix d’achat du coton-graine à la fin de 2020. Malgré cette crise, l’agriculture burkinabè a continué à jouer pleinement son rôle nourricier grâce à la mobilisation des agriculteurs, des commerçants et des transporteurs, même si elle montre des fragilités dues à sa forte dépendance aux marchés extérieurs pour entre autres les légumes, le bétail, le coton, les mangues, l’anacarde et les intrants agricoles et d’élevage. Cette crise permet de réfléchir à des axes d’intervention afin de rendre l’agriculture burkinabè moins dépendante des marchés extérieurs et des facteurs de production importés. Cela implique la substitution des produits alimentaires importés par des produits locaux et une transition agroécologique permettant de réduire l’importation d’intrants de synthèse.
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Amonmidé, Isidore, Pierre Bienvenu Irénikatché Akponikpè, and Gustave Dieudonné Dagbénonbakin. "Réponse du cotonnier (Gossypium hirsutum L.) à la fertilisation minérale dans diverses zones agro-écologiques : revue quantitative." BASE, no. 2 (2021): 89–108. http://dx.doi.org/10.25518/1780-4507.19016.

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Description du sujet. La réponse du cotonnier à la fertilisation minérale a été évaluée à travers une revue quantitative. Objectifs. Il s’agissait de (i) faire une synthèse des données disponibles sur la réponse du cotonnier à la fertilisation, (ii) modéliser le rendement en fonction des niveaux de fertilisants appliqués et (iii) identifier les facteurs environnementaux qui influencent la réponse du cotonnier à la fertilisation. Méthode. Une analyse quantitative de 71 publications scientifiques (930 traitements, témoins compris) a été effectuée afin de collecter les données de rendements en coton graine et en coton fibre à travers une recherche documentaire dans les bibliothèques scientifiques en ligne sur les pratiques de fertilisation du cotonnier suivant des critères bien définis. Un modèle linéaire à effet mixte a été utilisé avec le logiciel R.3.6.1 pour la comparaison de la réponse du cotonnier aux diverses doses de fertilisants minéraux. Résultats. Dans 95 % des cas, cette étude a montré une réponse positive du cotonnier à la fertilisation minérale. Les doses de nutriments appliquées ont significativement affecté la réponse du cotonnier et l’efficience agronomique de l’azote (AE-N, p < 0,05). Cependant, le type de sol, la pluviométrie et l’altitude n’ont pas significativement influencé la réponse du cotonnier, mais ont significativement affecté l’AE-N. La combinaison de N, P et K a enregistré les meilleurs ratios de réponse et de l’AE-N comparativement à l’application exclusive de l’azote ou sa combinaison avec le phosphore ou le potassium. Conclusions. Cette étude suggère l’application combinée des éléments majeurs (N, P, K) à des doses modérées afin d’améliorer l’efficience d’utilisation des nutriments en culture cotonnière. Les conditions pédoclimatiques n’ont pas significativement affecté la réponse du cotonnier, mais ont significativement influencé l’AE-N.
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Ortega, Raquel, Mario D. Monzón, Zaida C. Ortega, and Eoin Cunningham. "Study and fire test of banana fibre reinforced composites with flame retardance properties." Open Chemistry 18, no. 1 (April 7, 2020): 275–86. http://dx.doi.org/10.1515/chem-2020-0025.

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AbstractThe interest in natural fibre reinforced composites is growing in industrial applications due to natural fibres being an attractive alternative to synthetic fibres. However, it is necessary to improve the fire behaviour of the material because natural fibres have a high combustibility. The objective of this work is to evaluate the fire resistance of polymer composites reinforced with natural fibre fabric, using magnesium hydroxide as flame retardant for the polymeric matrix and alkali treatment for the fibre. The types of fabric are banana, banana with cotton and linen; and long banana fibre has been used for the formation of a nonwoven. The fire test is carried out based on ISO 9773 standard and the effect of the additive has been studied, chemical treatment, type of fabric and number of layers. Through statistical analysis, it is concluded that the flame propagation speed has a decreasing relation with respect to the percentage, but it decreases the mechanical properties considerably. In addition, the number of layers and type of fabric influence the fire properties. Finally, it is concluded that composites reinforced with linen fabric have the best mechanical properties, but banana nonwoven with 60% additive has the best fire behaviour.
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Masood, Ammara, Hira Mubeen, and Nadia Iqbal. "Sequence Analysis and Expression Study of LTP7 Promoter Isolated from Cotton (Gossypium hirsutum L.)." Biological Sciences - PJSIR 62, no. 3 (December 2, 2019): 148–58. http://dx.doi.org/10.52763/pjsir.biol.sci.62.3.2019.148.158.

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Lipid transfer proteins (LTPs) have role in transfer of phospholipids along biological membranes. A cotton LTP7 promoter was isolated using high throughput genomic sequences (HTGS) data base. Analysis of promoter nucleotide sequence revealed a number of crucial regulatory elements including core promoter elements. A 1.8 kb fragment of LTP7 promoter was isolated from genomic DNA of cotton and finally cloned in plant expression vector to characterize its functionality. Transient GUS assay revealed that promoter showed expression in cotton fibres during the time of elongation and different stages of secondary cell wall synthesis. Deletion analysis at 5' end showed that 1 kb promoter showed strong expression during stage of secondary cell wall synthesis. Whereas, 1.5 kb deletion fragment exhibited less strong expression in cotton fibres. Results of this present study, showed that 1 kb deletion fragment and 1.8 kb LTP7 promoter exhibits fibre specific expression and may be used to express fiber genes in cotton.
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Chakraborty, Shankar, and Siddhartha Bandhopadyay. "Cotton fibre selection and grading – a PROMETHEE-GAIA-based approach." International Journal of Clothing Science and Technology 29, no. 5 (September 4, 2017): 646–60. http://dx.doi.org/10.1108/ijcst-12-2016-0137.

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Purpose In spinning industries, selection of the most appropriate fibre for yarn manufacturing plays an important role for achieving an optimal mix of several yarn characteristics, like maximum tenacity, elasticity and spinning ability; and minimum unevenness and hairiness. Identification of the best suited cotton fibre from a set of available alternatives in presence of different conflicting physical properties is often treated as a multi-criteria decision-making (MCDM) problem. The paper aims to discuss this issue. Design/methodology/approach In this paper, the preference ranking organisation method for enrichment of evaluations (PROMETHEE) and geometrical analysis for interactive aid (GAIA) methods are integrated to solve a cotton fibre selection problem. The PROMETHEE II method ranks the alternative cotton fibres based on their net outranking flows, whereas GAIA acts as a visual aid to strongly support the derived selection decision. The weight stability intervals for all the considered fibre properties (criteria) over which the position of the top-ranked cotton fibre remains unchanged are also determined. Findings The clusters of cotton fibres formed in the developed GAIA plane act as a yard stick for their appropriate grading to aid the blending process. The ranking of 17 cotton fibres as achieved applying the combined PROMETHEE-GAIA approach highly corroborates with the observations of the past researchers which proves its immense potentiality and applicability in solving fibre selection problems. Originality/value Two MCDM methods in the form of PROMETHEE II and GAIA are integrated to provide a holistic approach for cotton fibre grading and selection while taking into consideration all the available cotton fibre properties.
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Masood, Ammara, Nadia Iqbal, and Hira Mubeen. "Review A Short Review of Promoters of Cotton Fibre Genes: Strength and Tissue Specificity." Biological Sciences - PJSIR 63, no. 2 (July 15, 2020): 127–31. http://dx.doi.org/10.52763/pjsir.biol.sci.63.2.2020.127.131.

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Promoters are of great importance for controlling gene expression. There are various regulatory regions within promoters which are crucial for expression specificity. Depending upon mode of expression, promoters can be divided into constitutive, tissue/developmental stage specific or inducible promoters. For expression of certain gene, there is interplay of cis acting element located on promoter and transcription factors. Cotton fibre promoters are of great importance in biotechnology as these may be used to express fibre genes in cotton fibres specifically. Although most of cotton fibre gene promoters show expression in fibres but some of them also exhibit expression in various other organs like trichomes, pedicles and vascular tissues. Due to difficulties in somatic embryogenesis in cotton, these promoters are mostly studied in heterologous systems like Arabidopsis and tobacco. In this article, expression pattern of some cotton fibre genes promoters have been reviewed.
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Aronsson, Julia, and Anders Persson. "Tearing of post-consumer cotton T-shirts and jeans of varying degree of wear." Journal of Engineered Fibers and Fabrics 15 (January 2020): 155892502090132. http://dx.doi.org/10.1177/1558925020901322.

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The demand for textile fibres is growing quickly. However, global cotton production has stabilized around 25 Mton/year. This is a sound development since cotton cultivation causes major sustainable development issues. Even if regenerated cellulose fibre production steadily grows, it is still only from a sixth to a fifth of cotton volumes. Hence, it is essential to find resource-efficient routes to generate alternatives to virgin cotton. There are many promising research initiatives that discover the possibility to utilize waste streams of neat cotton and cotton in fibre blends as raw materials for dissolving pulp for regeneration into, for example, viscose or Lyocell. However, there is a much simpler and energy-efficient route at hand. If fabrics are disintegrated mechanically, the separated fibres can be turned into yarn again. However, since fibre length is a key parameter to accomplish strong and durable textiles, fibre length loss upon tearing should be minimized. This study evaluates how fibre length distribution alters upon tearing of post-consumer cotton waste of two different constructions: denim and single jersey; and different degrees of wear, rendering four different fractions: (1) barely worn denim, (2) rather worn denim, (3) barely worn single-jersey and (4) rather worn single-jersey. Before tearing, the garments were dissembled, their yarns were characterized, fibre length distributions were manually determined for (1)–(4). Length analysis of the recovered fibres after tearing revealed that the length drop was most severe for (a) the finer single-jersey and (b) the barely worn fractions. The findings suggest that significant wear does not exclude from mechanical recycling.
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Günaydin, Gizem Karakan, Ali Serkan Soydan, and Sema Palamutçu. "Evaluation of Cotton Fibre Properties in Compact Yarn Spinning Processes and Investigation of Fibre and Yarn Properties." Fibres and Textiles in Eastern Europe 26, no. 3(129) (June 30, 2018): 23–34. http://dx.doi.org/10.5604/01.3001.0011.7299.

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Fibre properties are influential factors for yarn properties. Cotton, whose physical properties vary depending on the cultivation region, is still a very common fibre used in the textile industry. Properties such as fibre length, fineness, strength and maturity affect yarn tensility, evenness, imperfections and hairiness. Four different 100% cotton blends were used as raw material (American cotton, Aegean cotton, Urfa cotton, Greek cotton) to be converted into 20 tex compact yarns separately. HVI parameters of each blend type starting from the bale until the 2nd drawing passage machine revealed that yarn processing stages and machinery are influential factors for fibre the properties of fibres that are produced on a spinning line. Additionally ANOVA tests supported the idea that the evenness, tensility, yarn imperfections, and hairiness parameter of yarns produced from various cotton blends were statistically different. Principal Component Analyses (PCA) and the Correlation Matrix were also applied in order to analyse the relationship between fibre properties and compact yarn properties of different blends.
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Sumithra, Murugesan, and Gayathri Murugan. "Extraction and characterization of natural fibres form Elettaria Cardamomum." Tekstilna industrija 69, no. 2 (2021): 30–33. http://dx.doi.org/10.5937/tekstind2102030s.

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Natural fibres are one of the good alternative sources for replacing synthetic fibres and reinforcing polymer matrices because of their eco-friendly nature. The present study was undertaken to investigate the fibres extract from Elettaria Cardamomum plant. The extracted Elettaria Cardamomum fibre was treated with NaOH for softening. Natural cellulose fibres extracted from Elettaria Cardamomum stems (ECS) have been characterized for their chemical composition and physical properties.The chemical composition of Elettaria Cardamomumstems (ECS) fi bres is, cellulose 60.44%, lignin 25.25%, wax 0.53%, ash 5.45%. Regarding physical properties of the fibres, single fibre strength was evaluated and the result was compared with cotton fibre and linen fibre.
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Dissertations / Theses on the topic "Fibre coton"

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Rjiba, Narjes. "Fibre de coton : microstructures et propriétés de surface." Mulhouse, 2007. http://www.theses.fr/2007MULH0873.

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Le principal objectif de ce travail était de caractériser d'un point de vue physico-chimique la surface de la fibre de coton. Une fibre brute et une fibre extraite à l'éthanol ont été analysées. Cette caractérisation a été principalement menée par chromatographie gazeuse inverse (IGC), permettant de déterminer l'énergie de surface de ces fibres en fonction de la température ainsi que leur morphologie de surface à une échelle moléculaire, avant et après traitement. Il a été montré que l'énergie de surface de la fibre brute dépend fortement de la présence de cires et de pectines qui recouvrent un tel type de fibre. En particulier, la fusion des cires en surface des fibres est nettement mise en évidence dans une gamme de températures comprises entre 50 et 90°C. La nano-morphologie de la surface de la fibre de coton est aussi très affectée par la présence des cires : une extraction à l'éthanol conduisant à une surface plus homogène d'un point de vue topographique. Dans la de Kième partie de ce travail, pour confirmer les résultats obtenus par IGC, la fibre de coton a été caractérisée par d'autres techniques microscopiques (microscopies électronique et à force atomique) et spectroscopiques (spectroscopie de photoélectrons, spectroscopies vibrationnelles,. . . )
The aim of this work was to characterize the surface of the cotton fibre from a physical and chemical point of view. Raw and ethanol extracted fibres were particularly analysed. This characterization was mainly performed by means of inverse gas chromatography (IGC), which allowed us to determine the surface energy of the fibres as a function of temperature as well as their surface morphology at a molecular scale, before and alter treatment. It was shown that the thermodynamic surface energy of the raw cotton fibre strongly depends on the presence of waxes and pectins which usually cover such a type of fibre. In particular, the melting of waxes on the fibre surface, in a range of temperatures from 50 to 90°C, is clearly pointed out. The nano-morphological aspects of the cotton fibre surface are also greatly affected by the presence of waxes: ethanol extraction leading to a more homogeneous surface from a topographical point of view. To confirm the results obtained by IGC, the characterization of cotton fibres was completed, in the second part of this work, by means of other microscopical (electronic and atomic force microscopies ) and spectroscopie (X-ray photoelectron spectroscopy, vibrational spectroscopies,. . . ) techniques
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Kamenopoulou, Vassiliki. "Proprietes dosimetriques des fibres textiles : application a la dosimetrie par resonance paramagnetique electronique d'un accident d'irradiation gamma." Toulouse 3, 1987. http://www.theses.fr/1987TOU30172.

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Nowrouzieh, Shahram. "Etude des phénomènes de cohésion et friction inter fibre : cas du coton." Mulhouse, 2007. http://www.theses.fr/2007MULH0896.

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Les fibres textiles sont couramment caractérisées par beaucoup de paramètres liés à la longueur, à la finesse, à la maturité, à la ténacité, etc. Cependant peu d'études concernent la caractérisation de l'état de surface de ces fibres ou ses propriétés frictionnelles. Ceci est davantage visible dans les études reliant les propriétés du fil à celles des fibres qui le composent. Dans ce cadre, le but de cette étude était, d'une part, de concevoir un dispositif expérimental simple et fiable pour caractériser le frottement inter-fibre et, d'autre part, d'établir par son intermédiaire des tendances de relations entre les caractéristiques des fibres et des fils. Nous avons commencé par concevoir un appareil simple de mesure de la force nécessaire pour dissocier un ruban sous pression inter-fibre contrôlée. Il est composé de deux chariots identiques, un des chariots est fixe, tandis que l'autre glisse sur un rail et se déplace à vitesse constante. Nous avons testé notre dispositif à différentes charges, vitesses et titres de ruban. Les études ont montré que dans le domaine expérimental utilisé, l'effet de la vitesse était négligeable alors que l'effet de la charge était hautement significatif. Le modèle qui décrit la force de frottement est inspiré par celui de Bowden et Tabor dans lequel la force de frottement et la charge normale sont normalisés par le nombre de fibres dans le ruban. Ce modèle a été validé dans un deuxième temps par une campagne d'essais sur 1 1 cotons différents. Cette deuxième étude a mis en évidence des pistes très intéressantes concernant l'effet du frottement sur les caractéristiques du fil, notamment sur sa ténacité. En effet, la force du frottement n'intervient pas directement sur la ténacité du fil, mais affecte de façon directe les paramètres de régularité du fil et se sont ces derniers qui déterminent en partie la ténacité du fil
The textile fibres are commonly characterized by many parameters related to the length, fineness, maturity, tenacity, and so, on. But few studies related tc, the characterization of the surface properties of these fibres or their frictional properties. This is more clearly seen in the studies relating the yarn and the fibre properties. In this côntext, the purpose of this study was, first, to design a simple and reliable device to characterize the inter-fibre friction and, secondly, to establish, by the means of the inter fibre frictional properties, some trends of relations between the fibre and yarn characteristics. We started by designing a simple device for measuring the force required to break a sliver under controlled inter-fibre pressure. It consists of two identical carriages, one is fixed, while the Cher slides on a rail and is moving at a constant speed. We tested our device at different loads, speeds and sliver count. The results have shown that in our experimental domain, the effect of speed was negligible while the effect of the load was highly significant. The model that describes the friction force is inspired by that of Bowden and Tabor in which the frictional force and the normal charge are normalized by the number of fibres in the sliver. This model was validated in a second stage by a series of tests on 1 1 different cottons. This second study highlighted some very interesting idea on the effect of friction on the yarn characteristics, especially on his tenacity. Really, the friction force does not affect directly the yarn tenacity, but directly affects the regularity parameters of the yarn and these last, which determine party the yarn tenacity
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Aboe, Modeste. "Etude de la variabilité intra-balle des caractéristiques technologiques des fibres de coton produites en Afrique de l'Ouest et du Centre." Phd thesis, Université de Haute Alsace - Mulhouse, 2012. http://tel.archives-ouvertes.fr/tel-00718836.

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Grâce aux développements techniques et technologiques des dernières décennies, le commerce international du coton passe graduellement d'un classement manuel et visuel à un classement à base de résultats de mesures instrumentales. Or adopter une technique requiert d'en étudier ses modalités et ses conditions d'utilisation. Aux USA, des études périodiques de variabilité permettent d'assortir ces résultats d'analyse de tolérances commerciales afin de limiter la fréquence des litiges. Adopter en Afrique les règles et les méthodes de mesure des USA exposerait à un risque de litige accru si les conditions de production déterminent un coton de qualité plus variable. Pour la première fois en Afrique, nous avons mené une étude de la variabilité des caractéristiques technologiques des fibres dans huit pays d'Afrique de l'Ouest et du Centre : Bénin, Burkina-Faso, Cameroun, Côte d'Ivoire, Mali, Sénégal, Tchad et Togo. Pendant deux saisons de production, nous avons réalisé une expérimentation à trois types de prélèvements de fibres : 1) huit échantillons par balle au sein de 215 balles produites dans 27 usines d'égrenage, 2) un échantillon par balle de 4286 balles constituées en séries de 200 balles consécutives en saison 1 et de 100 balles consécutives en saison 2 dans les mêmes usines, 3) deux échantillons par balle (un en haut et un en bas) sur 817 balles constituées en séries de vingt balles consécutives hebdomadairement dans cinq usines au cours de la saison 2. Ensuite, les échantillons des 5318 balles échantillonnées furent analysés sur une Chaîne de Mesures Instrumentales (CMI) dans un laboratoire respectant les recommandations internationales et les conditions d'ambiance contrôlées. L'analyse statistique des données recueillies a permis d'évaluer le niveau de variabilité de chacune des caractéristiques technologiques étudiées, au sein des balles et entre celles-ci. Une méthode d'échantillonnage et de réalisation des analyses sur CMI est proposée pour réaliser le classement des balles de coton d'Afrique de l'Ouest et du Centre à partir de résultats précis et répétables respectant les règles commerciales établies au niveau mondial.
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Hernàndez, Hernàndez Valeria. "Interaction between turgor pressure and plasmodesmata permeability." Thesis, Lyon, 2019. http://www.theses.fr/2019LYSEN076.

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Les cellules végétales sont entourées par une paroi cellulaire rigide, ce qui qui exclut des processus essentiels au développement animal, comme la migration cellulaire et le réarrangement des tissus. Au lieu de cela, le développement des plantes repose sur la division et l'expansion cellulaires. Le paradigme actuel suppose que l’expansion cellulaire dépend des propriétés biomécaniques de la paroi cellulaire et de la génération de la pression de turgescence. Les plasmodesmes sont des canaux membranaires qui relient des cellules voisines et permettent la libre circulation des molécules plus petites que leur diamètre (définissant leur perméabilité). Il est établi que la perméabilité des plasmodesmes change au cours du développement de la plante et que ces modifications peuvent affecter le mouvement des sucres. Pour cette raison, la perméabilité des plasmodesmes semble être un bon candidat pour la régulation de la pression de turgescence lors de l'expansion cellulaire, cependant, son rôle reste largement inexploré. Ainsi, des études antérieures suggèrent que les plasmodesmes peuvent répondre aux changements de pression de turgescence. Dans ce travail, nous avons avancé l'hypothèse selon laquelle la pression de turgescence et la perméabilité des plasmodesmes pourraient s’influence au cours du développement de la plante. Nous avons abordé ce problème en mettant tout d'abord en avant un réseau d'interactions entre différents facteurs cellulaires et moléculaires susceptibles de médier ces rétroactions entre la turgescence et les plasmodesmes. Deuxièmement, nous avons généré un modèle informatique pour explorer une direction de ces interactions: le rôle de la perméabilité des plasmodesmes sur la régulation de la pression de turgescence. Notre modèle utilise les équations de Lockhart décrivant l’expansion cellulaire irréversible, auxquelles sont ajoutées les flux d'eau et de solutés à travers les plasmodesmes. Nous avons utilisé la fibre de coton comme système d’étude car il s’agit d’une cellule unique qui ne se divise pas et qui augmente généralement en longueur. De plus, des études expérimentales antérieures dans ce système ont montré une corrélation entre la fermeture de plasmodesmes et des valeurs maximales de la pression de turgescence. Les résultats de notre modèle suggèrent que la perméabilité des plasmodesmes est en effet un facteur clé dans la régulation de la turgescence et de la croissance de la fibre du coton. De plus, nous suggérons que des changements dynamiques de la perméabilité des plasmodesmes soient nécessaires pour récupérer les comportements de pression de turgescence qui ont été rapportés expérimentalement
Plant cells are surrounded by the rigid cell wall that precludes developmental processes that are central in animal development, like cell migration and tissue rearrangement. Instead, plant development relies on cell division and expansion. The current paradigm assumes that cell expansion depends on the biomechanical properties of the cell wall and on the generation of turgor pressure. Plasmodesmata are membrane-lined channels that connect neighboring cells and allow free movement of molecules that are smaller than their diameter (i.e., permeability). It is known that plasmodesmal permeability changes during plant development and that these modifications can affect movement of sugars. Because of this, plasmodesmal permeability seems to be a good candidate for the regulation of turgor pressure during cell expansion, however, its contribution remains largely unexplored. In turn, previous studies suggest that plasmodesmata may respond to changes in turgor pressure. In this work we put forward the hypothesis that turgor pressure and plasmodesmal permeability may affect each other during plant development. We addressed this problem by, first, putting forward a network of interactions between different cellular and molecular factors that might mediate these feedbacks between turgor and plasmodesmata. Second, we generated a computational model to explore one direction of these interactions: the role of plasmodesmal permeability on turgor pressure regulation. Our model uses Lockhart's equations for irreversible cell expansion with addition of plasmodesmal-dependent fluxes of water and solutes. We used cotton fiber as a study system because it is a single cell without division that mostly increases in length. Furthermore, previous experimental studies in this system have correlated closure of plasmodesmata with peak values of turgor pressure. The results of our model suggest that plasmodesmal permeability is, indeed, a key factor in regulating turgor and cotton fiber growth. Moreover, we suggest that dynamical changes of plasmodesmal permeability are needed in order to recover turgor pressure behaviors that have been experimentally reported. Finally, we explored with our collaborators the potential contribution of plasmodesmal permeability in the evolution of complex multicellular plants using the "Dynamical Patterning Modules" (DPMs) framework. These ideas can be useful in understanding how plant body plans originated
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Zhao, Yifang. "La fixation des colorants réactifs au coton aux moyens du rayonnement infrarouge = Fixation of reactive dyes on cotton using infrared radiation." Sherbrooke : Université de Sherbrooke, 2000.

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Hernandez-Gomez, Mercedes Clara. "Cell walls and cotton fibre development." Thesis, University of Leeds, 2015. http://etheses.whiterose.ac.uk/11458/.

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Bel, Patricia Damian. "Cotton quality - fibre to fabric: fibre properties relationships to fabric quality." University of Southern Queensland, Faculty of Engineering and Surveying, 2004. http://eprints.usq.edu.au/archive/00003193/.

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[Abstract]: The textile industry has a recurrent white speck nep problem in cotton. “White specks” are immature clusters of fibres that are not visible as defects until dyeing, after which they remain white on the surface of a darkly dyed fabric, or appear as non uniform streaks in the fabric. Both results render the fabric unsuitable for commercial fashion fabrics. The white speck potential of cotton is difficult to predict except in extremely immature cottons. Competitive synthetic fibres are uniform in length and strength and never have a maturity problem resulting in dye defects. They are much more predictable in the mill. As a result, cotton faces the risk of being replaced by synthetic fibres. Industry requires a method to predict fabric quality from cotton bale fibre properties to minimize this risk. This research addresses the problem of predicting white specks in dyed cotton fabrics. It is part of a large study, which is supported jointly by US and Australian agencies. The main objective is to predict fabric quality from bale fibre properties given controlled gin and mill processing. Gin and mill processing must be controlled so that field and varietal effects can be seen without the interaction of mechanical processing differences. This results in achieving other objectives, including the provision of baseline data for Australian varieties, ginning effects and comparison of ring and open-end spinning. Initially a reliable method for measuring white specks had to be found. Several systems have been evaluated and are reported here. The systems accuracy was compared using fabrics from the US Extreme Variety Study (EVS), which was grown specifically to have different levels of white specks. The fabrics made from the US (Leading Variety Study 1993 (LVS) and The American Textile Manufacturers Institute (ATMI) Cotton Variety Processing Trials, 2001) and the Australian (1998 & 1999) variety studies were analysed using AutoRate-2-03, the best of the image analysis systems studied. The final release of AutoRate (February 2003) was developed by Dr. Bugao Xu to measure white specks on dark fabrics in conjunction with this research. This final analysis of these studies results in white speck prediction equations from high-speed fibre measurement systems. This information should be immediately useful to as a tool to measure the effects of field and ginning practices on the levels of white specks without having to carry the research out to finished fabrics. Cotton breeders will be able to use the equations in the development of new varieties with low white speck potential, by eliminating varieties with high white speck potential early on. The research will continue on a much larger scale in the US and hopefully a WSP (White Speck Potential) value will be incorporated into the US Cotton Grading System.
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9

Bissou, Billong Julienne. "Fixation thermique par rayonnement infrarouge des colorants réactifs sur les fibres de coton d'un tissu fait de coton/polyester." [S.l. : s.n.], 2003.

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McGinley, Susan. "Keys to Cotton Fiber Strength." College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 1993. http://hdl.handle.net/10150/622333.

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Books on the topic "Fibre coton"

1

Basu, Arindam. Cotton fibre selection and grading. Coimbatore: South India Textile Research Association, 2004.

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Schulte, Elaine L. Daniel Colton Under Fire. Greenville, S.C: BJU Press, 2001.

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Schulte, Elaine L. Daniel Colton under fire. Grand Rapids: Zondervan Pub. House, 1992.

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Sea fire. London: Macdonald, 1986.

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Robards, Karen. Sea fire. New York: Leisure Books, 1991.

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Robards, Karen. Sea fire. London: Futura, 1985.

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Sea Fire. New York City: Leisure Books, 1991.

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Low, It-Meng, Thamer Alomayri, and Hasan Assaedi. Cotton and Flax Fibre-Reinforced Geopolymer Composites. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-2281-6.

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Lord, E. The origin and assessment of cotton fibre maturity. 2nd ed. Manchester: International Institute for Cotton, Technical Research Division, 1988.

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Morris, David. Cotton to 1993: Fighting for the fibre market. London: Economist Intelligence Unit, 1988.

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Book chapters on the topic "Fibre coton"

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Gooch, Jan W. "Cotton Fiber." In Encyclopedic Dictionary of Polymers, 174. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_2978.

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Reddy, Bandaru S. "Colon Cancer: Future Directions." In Dietary Fiber, 543–52. Boston, MA: Springer US, 1986. http://dx.doi.org/10.1007/978-1-4613-2111-8_40.

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French, Alfred D., and Hee Jin Kim. "Cotton Fiber Structure." In Cotton Fiber: Physics, Chemistry and Biology, 13–39. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-030-00871-0_2.

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Guan, Xueying, and Z. Jeffrey Chen. "Cotton Fiber Genomics." In Seed Genomics, 203–16. Oxford, UK: Wiley-Blackwell, 2013. http://dx.doi.org/10.1002/9781118525524.ch11.

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Kim, Hee Jin. "Cotton Fiber Biosynthesis." In Cotton Fiber: Physics, Chemistry and Biology, 133–50. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-030-00871-0_7.

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Siddiqui, Muhammad Qasim, Hua Wang, and Hafeezullah Memon. "Cotton Fiber Testing." In Textile Science and Clothing Technology, 99–119. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-9169-3_6.

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Zieher, Carolyn. "Biochemistry of the Fiber." In Physiology of Cotton, 361–78. Dordrecht: Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-90-481-3195-2_32.

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Fadden, Kathleen. "The Ecology of the Colon." In Dietary Fiber, 101–18. Boston, MA: Springer US, 1986. http://dx.doi.org/10.1007/978-1-4613-2111-8_8.

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Latif, Ayesha, Ammara Ahad, Mukhtar Ahmed, Sidra Akhtar, Aneela Yasmeen, Ahmad Ali Shahid, Abdul Qayyum Rao, Idrees Ahmad Nasir, and Tayyab Husnain. "GM Technology and Fiber Traits." In Cotton Precision Breeding, 281–300. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-64504-5_12.

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Drieling, Axel, and Jean-Paul Gourlot. "Cotton/Worldwide Harmonisation." In Industrial Applications of Natural Fibres, 353–70. Chichester, UK: John Wiley & Sons, Ltd, 2010. http://dx.doi.org/10.1002/9780470660324.ch17.

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Conference papers on the topic "Fibre coton"

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Kawasaki, Yoshihiro, Eiichi Aoyama, Toshiki Hirogaki, Tetsurou Ise, and Eiji Hara. "Strength Criteria for Designing Hybrid-Fiber Reinforced Plastic Gears." In ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-66394.

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In this study, we investigated the bending fracture characteristic of FRP gears as an important design criterion. Gears made from four kinds of laminated materials were tested: cotton reinforced phenolic resin, cotton-carbon (30%:70%), cotton-aramid (70%:30%, 40:60%), aramid, and glass fiber cloth. Cotton-cloth and cotton-aramid cloth are called hybrid-fiber cloth in this paper. Gears were reinforced by setting the fiber cloth in radial and circumferential directions and were manufactured by hobbing. This results in the same bending fracture strength for all the gear teeth. First, we investigated the tensile strength of the laminated materials because this is a fundamental design criterion for metallic gears. Second, we estimated the bending fracture strength of each gear’s teeth because this is a fundamental evaluation index in the design of gears. Theoretically, the bending fracture strength of a gear is in proportion to the tensile strength of the materials from which it is made. However, in our experiments, we found this was not the case. To discover the cause, we looked at the fracture position on each gear tooth. That of the cotton-carbon gear was more towards the tip of the tooth than the in other gears, and that of the glass fiber gear occurred on the compressive pressure side of the tooth root. We then investigated the shearing strength and compressive strength of the materials because these may have influenced the position of the fracture points. The shearing strength of the cotton-carbon laminated material was low compared with its tensile strength, as was the compressive strength of the glass fiber laminated material. We found that if the shearing strength is low compared with the tensile strength, the position of the fracture that occurs is towards the tip of the gear tooth. If the compressive strength is low compared with the tensile strength, a fracture on the compressive side occurs. Our results show that it is necessary to consider the tensile, compressive, and shearing strength of FRP materials when designing gears made from FRP.
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Eisenstein, Jessica, Peter Y. Wong, and Caroline G. L. Cao. "Development of an Endoscopic Fiber Optic Shape Tracker." In ASME 2010 5th Frontiers in Biomedical Devices Conference. American Society of Mechanical Engineers, 2010. http://dx.doi.org/10.1115/biomed2010-32032.

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Colon cancer is estimated to be the third leading cause of cancer-related death in the US [1], with the cost of colorectal cancer treatment reaching $8.4 billion annually [2]. Though colonoscopy is the current standard for colon cancer screening and diagnosis, the procedure has disadvantages due from the near-blind navigation process used. During the procedure, endoscopists frequently lose sight of landmarks in the colon, losing track of their locations within the colon and becoming disoriented.
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Li, Teng, Xianfa Fang, Decheng Wang, Jinkui Feng, and Binbin Zhang. "The study on friction test between cotton fiber, cotton ,cotton seed and steel surface." In 2017 Spokane, Washington July 16 - July 19, 2017. St. Joseph, MI: American Society of Agricultural and Biological Engineers, 2017. http://dx.doi.org/10.13031/aim.201701305.

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Vince P Schielack III, Ruixiu Sui, J A Thomasson, Eric Hequet, and Christine Morgan. "Harvester-Based Cotton Fiber Quality Sensor." In 2009 Reno, Nevada, June 21 - June 24, 2009. St. Joseph, MI: American Society of Agricultural and Biological Engineers, 2009. http://dx.doi.org/10.13031/2013.28043.

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Gavalis, Robb M., Hua Xing, Peter Y. Wong, Lothar Lilge, and Caroline G. L. Cao. "Endoscope Shape-Tracker Based on Embedded Fluorescent Dyes in an Optical Fiber." In ASME 2008 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2008. http://dx.doi.org/10.1115/sbc2008-192809.

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Endoscopes are used in medicine to inspect inside the body without having to perform open surgery on the patient. The current gold standard for screening and diagnosing colorectal cancer and inflammatory bowel disease is the colonoscopy. This procedure uses a flexible endoscope to inspect the wall of the large intestine, from the rectum to the caecum, for cancerous or precancerous lesions. This screening is very important since early detection of colon cancer is 85–95% successfully treated. Unfortunately, there is only a 30% compliance rate for colonoscopies in the United States. This lack of compliance is due largely in part to the uncomfortable nature of the procedure, caused by the fact that the stiff scope is difficult to manipulate in the non-rigid colon, leading to “looping” of the scope (see Fig. 1), and that the clinician is essentially navigating in near blind conditions during the procedure.
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Peel, Larry D., and Madhuri Lingala. "Testing and Simulation of Stress-Stiffening Extreme Poisson’s Ratio Twisted Fiber-Reinforced Elastomer Composites." In ASME 2008 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASMEDC, 2008. http://dx.doi.org/10.1115/smasis2008-526.

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Laminates that exhibit high and negative Poisson’s ratios can be used as solid-state actuators, passive and active vibration dampers, and for morphing aircraft structures. Recently, fiber-reinforced elastomer (FRE) laminates have been fabricated that exhibit extreme (high and negative) Poisson’s ratios [1]. The current research explores twisted fiber bundle elastomeric laminates (both single and double helix) which are being investigated using experimentation, linear and non-linear finite element analysis (FEA). Twisted fiber bundles can be made from carbon fibers, fiberglass, etc, but for simplicity the current work uses twisted cotton string. It is observed that uniaxial fiber-reinforced elastomer laminates, where the fibers are twisted as shown in Figure 1, exhibit stress stiffening. Negative Poisson’s ratios may be produced if the fiber bundles have a double helical path as simulated by a series of laminated tubes. Future auxetic FRE laminates may be developed that do experience extreme shear.
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Li Yujun, Liang Kun, and Bai HuaYu. "Key Technology in Detecting and Eliminating Isomerism Fibre in Cotton." In 2007 8th International Conference on Electronic Measurement and Instruments. IEEE, 2007. http://dx.doi.org/10.1109/icemi.2007.4351246.

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Ancelotti, Antonio, Aureliano Ribeiro, Bruna Rennó, and Felipe Eloy. "Experimental dynamic evaluation of cotton fiber composite material." In 24th ABCM International Congress of Mechanical Engineering. ABCM, 2017. http://dx.doi.org/10.26678/abcm.cobem2017.cob17-1544.

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Rahman, Md Rezaur, Md Mizanur Rahman, Sinin Hamdan, Md Faruk Hossen, Josephine Chang Hui Lai, and Fui Kiew Liew. "A Rapid Synthesis of Cotton from Tossa Jute Fiber and Comparative Study with Original Cotton." In Proceedings of the International Engineering Conference. Singapore: Research Publishing Services, 2014. http://dx.doi.org/10.3850/978-981-09-4587-9_p27.

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Zhong, Chen, Rijiang Wang, and Hongjun Ding. "Smoke-based video fire detectors sensitivity tests using smouldering cotton fire." In 2016 3rd International Conference on Systems and Informatics (ICSAI). IEEE, 2016. http://dx.doi.org/10.1109/icsai.2016.7811095.

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Reports on the topic "Fibre coton"

1

Cooper, Michelle H., and Maurice Roy. Evaluation of Fire Retardant Treated 100% Cotton Open-End Denims. Fort Belvoir, VA: Defense Technical Information Center, September 1990. http://dx.doi.org/10.21236/ada244006.

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