Gotowe bibliografie tematyczne / Coton fiber

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  1. Artykuły w czasopismach
  2. Rozprawy doktorskie
  3. Książki
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Gotowa bibliografia na temat „Coton fiber”

Autor: Grafiati
Data publikacji: 4 czerwca 2021
Data aktualizacji: 13 lutego 2022

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Artykuły w czasopismach na temat "Coton fiber"

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Bourgou, Larbouga, Windpouiré Vianney Tarpaga, Sidiki K. Diane i 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, nr 3 (18.06.2020): 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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Alexis, Hougni, Imorou Lucien, Dagoudo Augustin i Zoumarou-Wallis Nouhoun. "Caractérisation Agro-Morphologique De Variétés De Cotonnier (Gossypium Hirsutum) Pour Une Régionalisation Economique Pour La Production Du Coton Au Bénin". European Scientific Journal, ESJ 12, nr 36 (31.12.2016): 210. http://dx.doi.org/10.19044/esj.2016.v12n36p210.

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To take more account of the terroir effect in varietal choice and address the concerns of cotton farmers who disapprove the agricultural policy of single variety, research on varietal regionalization was initiated during four campaigns, by the Agricultural Research Center for Cotton Fibers. This idea is reinforced by the diversity of agro-ecological zones of the country. The nonrenewal of the variety in extension since the 2002-2003 campaign is also an element of justification concerns of industry players. This study aims to exploit the terroir effect to identify the most suitable varieties for each agroecological zone and meet the needs of industry players including producers and ginners. The experiment was conducted in 2011-2012 on Angaradébou sites, Okpara, Savalou and Ketou respectively representing the zones 1 (Alibori / Atakora); 2 (Borgou / Donga); 3 (Hills) and 4 (Zou / Ouemé Plateau / Mono-Couffo). The adopted experimental device is a Fisher block with four replicate and eight treatments or varieties H 279-1 in extension witness. Other varieties include E 944-2; E 956-2; H 769-5; H 782-3; I 875-3; K 768-3 and K 787-2.The measured parameters are the earliness of production, seed cotton yield in the field, the weight of 100 seeds and the fiber ginning outturn. Data analysis revealed significant differences between and inside sites for most measured parameters. The results showed that varieties E 956-2 (1983.85 kg / ha), H 769-5 (1820.49 kg / ha), K 768-3 (1735.42 kg / ha) and H 782-3 (1533.59 kg / ha) in terms of seed cotton yield in the field and compared their performance to shattering were the best respectively in zones 1, 2, 3 and 4.
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Long, Robert L., Christopher D. Delhom i Michael P. Bange. "Effects of cotton genotype, defoliation timing and season on fiber cross-sectional properties and yarn performance". Textile Research Journal 91, nr 17-18 (10.02.2021): 1943–56. http://dx.doi.org/10.1177/0040517521992769.

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Cotton fiber cross-sectional properties influence the performance of ring spun yarns. The spinning performance of two Gossypium hirsutum L. Upland cotton genotypes known to have inherently different fiber fineness properties were compared. Genotypes were grown together in field experiments conducted over two growing seasons, and crops were subjected to early and late defoliation treatments. The aim was to quantify the differences in yarn properties following changes targeting fiber fineness properties in isolation from other fiber properties. For the first time, the percentage difference in yarn properties was captured along with the associated changes made to alternative fiber fineness properties within the base micronaire 3.50 to 4.90 G5 range. As expected the genotype with lower fiber micronaire, linear density, and perimeter, spun yarns that were stronger and more even. Late defoliated cotton plants produced fibers that were higher in micronaire and maturity ratio, and were bigger in perimeter, which demonstrated that the fibers had expanded during the secondary wall thickening phase of development. However, the defoliation treatment effect on fiber fineness properties was smaller compared with the effect of genotype, and no change to any yarn property was detected. In terms of environmental effects, the first season cotton had smaller perimeter finer fibers that spun stronger and more even yarns. In contrast, the second season cotton had bigger perimeter fibers that spun weaker and less even yarns.
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Yu, Chongwen, Weiying Tao i Timothy A. Calamari. "Treatment and Characterization of Kenaf for Nonwoven and Woven Applications". International Nonwovens Journal os-9, nr 4 (grudzień 2000): 1558925000OS—90. http://dx.doi.org/10.1177/1558925000os-900409.

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A kenaf bast fiber is comprised of a bundle of single fibers bound by lignin and pectins. It offers the advantages of being renewable, biodegradable and environmentally safe. However, it is difficult to process kenaf fibers because of the coarseness, stiffness and low cohesion of the fiber bundles. In this research, kenaf fiber bundles have been treated by both alkaline sulfide and a modified chemical degumming methods to improve fiber properties. Tensile properties, fineness, length and softness of the kenaf fiber bundles after the treatments were determined. It was found that both treatments improved the fiber fineness, softness and elongation; however, fiber bundle strength was decreased. The modified chemical degumming method was more effective. Under the optimum modified chemical degumming condition, the fineness of the kenaf fiber bundle was improved more than 50% and the fiber bundle was more than twice as soft as the raw material. These kenaf fiber bundles were much finer and softer and found to be easier to process than those obtained in earlier studies. The treated kenaf fiber bundles can be blended with cotton fibers and easily carded on a cotton card with minimum losses. The carded batts can be further processed for either nonwoven or woven applications.
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Zhang, Wei Hao, Guo Zhong Li i Min Rong Liu. "Properties Research of Cotton Fiber Reinforced Gypsum Based Composites". Advanced Materials Research 194-196 (luty 2011): 1759–62. http://dx.doi.org/10.4028/www.scientific.net/amr.194-196.1759.

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Cotton fibers and gypsum were taken as the raw materials to manufacture cotton fiber reinforced gypsum based composites. Optimum length and dosage of cotton fiber and mixing method were confirmed in the experiments. The effect of cotton fiber on mechanical properties and waterproof properties of composites were studied. The reinforcement mechanism of cotton fibers on composites was discussed.
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Balakrishnan, Subashini, GL Dharmasri Wickramasinghe i UG Samudrika Wijayapala. "Study on dyeing behavior of banana fiber with reactive dyes". Journal of Engineered Fibers and Fabrics 14 (styczeń 2019): 155892501988447. http://dx.doi.org/10.1177/1558925019884478.

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The objective of this research paper is to establish a suitable reactive dyeing process for banana fiber and comparison between dyeing behaviors of banana fibers with cotton fibers. Ambon (Cavendish type) banana variety was selected for this research study. Data accumulation is done by quantitative research methodology and experimental research strategies for this investigation; 5% enzyme and 6% H2O2-, 2% Na2SiO3-, and 3% NaOH-treated banana fibers were dyed with reactive dye. Banana fibers were dyed with three standard colors (red, blue, and yellow) each with four different concentrations (0.25, 1%, 4%, and 6%) of reactive dye. Testing was conducted to assess the color properties between pretreated banana fiber, dyed banana fiber, and cotton fiber. Color measurement was performed by using a Datacolour 600 spectrophotometers. The ΔE* values were used to determine the degree of color deterioration. Results showed that pretreated fibers become brighter (whiteness) than the raw banana fibers. Reflectance curves of dyed banana fibers were found similar to cotton in all the experiments and confirming the dye absorption tendency is more similar to cotton. Further results indicate that the dyeing behavior of banana is similar to cotton. Therefore, cotton dyeing process can be applied for the banana fibers. Dyeing of banana fiber was carried out with a reactive type of dye, which provided better washing fastness properties than cotton fibers.
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Saputra, Ardian Dwi, M. Fahrur Rozy H, Agus Triono i Imam Sholahuddin. "ORIENTASI SUDUT LILITAN BENANG KATUN TERHADAP KEKUATAN TARIK PADA PIPA KOMPOSIT FILAMENT WINDING". ROTOR 10, nr 1 (1.04.2017): 1. http://dx.doi.org/10.19184/rotor.v10i1.5138.

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Cotton fibers currently use in many industries textiles, easy gotten in the market, and a cheap price. Using of fiber would be able to solve the environtment problems, reduce the metal using, particularly in the oil and gas industries. In this study, composite pipes are made by cotton fibers as reinforcement, particles of montmorillonite as filler, and unsaturated polyester as matrix. From that consideration this study was conducted to obtain that analysis of tensile strength composite cotton fibers. With the pattern of variation woven fiber direction angle towards the corner fibers 450, 550, 650, 750, and 850. From the test results the highest tensile strength values is obtained by a composite pipe with fiber direction angle of 850. The test results showed that the tensile strength of the cotton fiber reinforced composite pipe with direction of 450 angle fiber is 3.76 MPa, for direction of 550 angle fiber tensile strength is 1.28 MPa, for direction of 650 angle fiber tensile strength is 10.691 Mpa, for direction of 750 angle fiber tensile strength is 14.465 Mpa, and for direction of 850 angle fiber tensile strength 28.617 MPa. Keywords: Cotton fiber, unsaturated polyester, filament winding method, montmorillonite, Tensile Strength
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Moghassem, A. R. "Study on the Dyed Cotton Fibers Damage in Spinning Processes and its Effect on the Cotton Mélange Yarn Properties". Research Journal of Textile and Apparel 12, nr 1 (1.02.2008): 71–78. http://dx.doi.org/10.1108/rjta-12-01-2008-b009.

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Grey cotton fibers with a mean fiber length and fineness of 29 mm and 4.2 micronair was pretreated, scoured and dyed. Three ring yarns were spun separately from 100% grey cotton (R.R.Y.), 50% dyed and 50% grey cotton blend (M.R.Y.) and 100% dyed cotton (D.R.Y.). The extent of fiber damage was assessed by measuring the length and the mechanical characteristics of cotton fibers after passing the fibers through the lap machine and the draw frame II. Properties of R.R.Y., M.R.Y. and D.R.Y. samples were examined. In terms of tenacity and elongation at break, grey and dyed cotton fibers, which were selected after being processed by the lap machine and the draw frame II, were very similar. The fiber length by number and weight of grey cotton was longer than that of dyed cotton, while the amount of fiber nep and short fiber content of dyed cotton were more than those of grey cotton. The three yarn samples were the same in terms of elongation at break. The tenacity of R.R.Y. was the highest but the yarn sample was the lowest in terms of coefficients of mass variation (Cv%), imperfection and hairiness in comparison with the M.R.Y. and D.R.Y. samples.
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Liyanage, Sumedha, i Noureddine Abidi. "Molecular weight and organization of cellulose at different stages of cotton fiber development". Textile Research Journal 89, nr 5 (23.01.2018): 726–38. http://dx.doi.org/10.1177/0040517517753642.

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There is a continuous change in cell wall composition and organization during cotton fiber development. Cotton fiber strength correlates to the molecular weight (MW) and molecular weight distribution (MWD), and organization of cellulose chains in the secondary cell wall. These parameters change drastically during fiber development. This study reports on the MW, MWD, and organization of cellulose in cotton fibers harvested from two cotton cultivars of Gossypium hirsutum L., (Texas Marker-1 and TX55) at different levels of maturity. Fiber dissolution is necessary to estimate the molecular properties of cellulose. Cellulose in mature cotton fibers is larger in MW and highly crystalline and, therefore, poorly dissolves in common solvent systems. To facilitate the dissolution, fibers were first pretreated with 23% sodium hydroxide and then dissolved in a dimethylacetamide/lithium chloride solvent system. Gel permeation chromatography of dissolved fibers indicated that cellulose in both cultivars reaches its maximum MW around 30 days post anthesis. Fourier transform infrared microspectroscopy imaging in the transmission mode indicates changes in cellulose distribution in cotton fibers with fiber development. The distributions of infrared vibrations of cellulose at 897 (β-linkage of cellulose), 1161 (anti-symmetrical C-O-C stretching of cellulose), and 1429 cm−1 (CH2 scissoring of cellulose) provided information on cellulose deposition in intact cotton fibers.
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Zhogashtiev, N., Y. Tashpolotov i N. Kalmurzaev. "Study of Cotton Fiber Surface After Thermal Processing in the Vacuum Chamber by the Method of Scanning Electron Microscopy". Bulletin of Science and Practice 6, nr 8 (15.08.2020): 34–38. http://dx.doi.org/10.33619/2414-2948/57/03.

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The article presents the results of a study of the surface of cotton fibers before and after thermal processing in a vacuum chamber by scanning electron microscopy. It has been established that various factors affect the structural and physicochemical properties of an ultrathin composite material based on ultra-dispersed carbon fiber. In this work, the microstructures of an ultrathin composite material obtained based on ultrafine cotton fibers were investigated and a chemical analysis of these fibers was carried out. Based on chemical analysis, it was found that the content of heat-treated cotton fiber is 98.62% during heat treatment (from 1000 to 1200 °C). Along with this, the resulting powder had carbon fibers with sizes from 2.42 to 9.18 μm, and thus ultra-thin fibers have high chemical activity. It is shown that heat treatment of the fiber leads to molecular bonding of the outer layer of the cotton fiber.
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Rozprawy doktorskie na temat "Coton fiber"

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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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Kamalha, Edwin. "Resources protection : towards replacement of cotton fiber with polyester". Thesis, Lille 1, 2019. http://www.theses.fr/2019LIL1I024/document.

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La demande annuelle de coton augmente en raison de la croissance démographique mondiale et de l’évolution des comportements d’achat des consommateurs. D'autres options de fibres naturelles telles que la laine, le lin et la soie, entre autres, sont produites dans des proportions très maigres. Le polyester (poly (téréphtalate d’éthylène) (PET) présente des qualités qui pourraient répondre à cette préoccupation pour les vêtements. Malheureusement, les consommateurs hésitent à porter des vêtements 100% polyester, principalement en raison d’un confort sensoriel inférieur, du toucher et parfois de leur apparence. Cette étude visait à améliorer le tissu en PET caractéristiques afin de réduire l'écart entre la perception humaine et la performance hydrophile du coton par rapport au PET Pour déterminer la disparité existant entre le coton et les tissus tissés en PET, une étude multisensorielle a été réalisée à l'aide d'un panel de 12 juges formés sur 11 descripteurs sensoriels. Des algorithmes de Monte Carlo, des algorithmes génétiques et la technique de Borda Count (BK) ont été utilisés pour la fusion de rangs .L'analyse en composantes principales (PCA) et la classification hiérarchique par agglomération (AHC) ont été utilisées pour créer des profils sensoriels. Tissus en PET et en coton (p = 0,05). Il a été déduit que l’aspect visuel et esthétique peut être utilisé pour distinguer le PET du tissus de coton. Pour remplacer le coton par du PET via cette approche sensorielle, la modification de la rigidité des tissus en polyester a été judicieusement réalisée à l'aide de NaOH et d'un adoucissant en silicium, avec une pré-oxydation au plasma atmosphérique. Les tissus en PET traités avec NaOH et l’adoucissant en silicone ont été perçus comme étant doux, lisses, moins nets et moins raides par rapport à certains tissus en coton et en PET non traité. Le profilage des tissus indique que les tissus en PET conventionnels peuvent être distingués des tissus en coton conventionnels en utilisant une évaluation à la fois subjective et objective. Il est également avancé que la perception sensorielle humaine sur textile ne peut être directement représentée par des mesures instrumentales. La dernière partie de l’étude compare le potentiel hydrophile et l’efficacité de deux monomères vinyliques: le poly- (éthylène glycol) diacrylate (PEGDA) et le chlorure de [2- (méthacryloyloxy) éthyl] triméthylammonium (METAC) radicalement photo-greffé sur la surface de Tissu en PET. Une étude de surface utilisant la spectroscopie photoélectronique à rayons X (XPS) et la spectroscopie à dispersion d'énergie (EDS) a confirmé le greffage. Les tests d'humidité indiquent que PEGDA et METAC induisent un mouillage complet du PET à des concentrations de 0,1 à 5% (V: V). Les mesures colorimétriques (K/S et CIELAB/CH) et la stabilité de la couleur sur les tissus teints en PET suggèrent que les deux monomères améliorent considérablement l'efficacité de la teinture du PET. Il est suggéré que PEGDA et METAC génèrent des groupes hydrophiles sur le PET; les macroradicaux sont sous la forme de structures vinyliques qui forment des greffes à chaîne courte et démontrent une fonction hydrophile. Les résultats de cette recherche peuvent jouer un rôle directeur pratique dans la conception des tissus, la conception des propriétés sensorielles et contribuer au développement de tissus en polyester de type coton
There is increasing annual demand for cotton due to world population growth and changes in consumers’ purchasing behavior. Other natural fiber options such as wool, linen and silk among others, are produced in very meager proportions. Polyester (poly(ethylene terephthalate) (PET) has qualities that could address this concern for apparel. Unfortunately, consumers are reluctant to wear 100% polyester clothing mainly due to inferior sensory comfort, touch and sometimes appearance. This study sought to improve PET fabric characteristics in order to decrease the gap between human perception and hydrophilic performance of cotton vs. PET. To determine the disparity between cotton and PET woven fabrics, a multisensory study was undertaken using a panel of 12 trained judges against 11 sensory descriptors. Cross-entropy Monte Carlo algorithms, Genetic algorithms, and the Borda Count (BK) technique were used for rank fusion. Principle component analysis (PCA) and agglomerative hierarchical clustering (AHC) were used to create sensory profiles. The descriptor crisp accounted for the highest variability between PET and cotton fabrics (p˂0.05). It was deduced that visual and aesthetics can be used to distinguish between PET and cotton fabrics. To replace cotton with PET via this sensory approach, the modification of stiffness of polyester fabrics was judiciously carried out using NaOH and a silicon softener, with atmospheric air plasma pre-oxidation. PET fabrics treated with NaOH and the silicon softener were perceived soft, smooth, less crisp, and less stiff compared to some cotton and untreated PET fabrics. The profiling of fabrics indicates that conventional PET fabrics can be distinguished from conventional cotton fabrics using both subjective and objective evaluation. It is also argued that textile human sensory perception cannot be directly represented by instrumental measurements. The final part of the study compares the hydrophilic potential and efficacy of two vinyl monomers: Poly-(ethylene glycol) diacrylate (PEGDA) and [2-(methacryloyloxy) ethyl]-trimethylammonium chloride (METAC) radically photo-grafted on the surface of PET fabric. Surface study using X-ray photoelectron spectroscopy (XPS) and Energy Dispersive Spectroscopy (EDS) confirmed the grafting. Moisture tests indicate that PEGDA and METAC induce complete wetting of PET at concentrations 0.1-5% (V:V). Colorimetric measurements (K/S and CIELAB/CH) and colorfastness on dyed PET fabrics suggest that both monomers greatly improve the dyeing efficiency of PET. It is suggested that PEGDA and METAC generate hydrophilic groups on PET; the macroradicals are in a form of vinyl structures which form short chain grafts and demonstrate hydrophilic function. The results of this research can play a practical guiding role in the design of fabrics, sensory property design and contribute to the development of cotton-like polyester fabrics
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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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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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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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Mujahid, Hana, Ken Pendarvis, Joseph Reddy, Babi Nallamilli, K. Reddy, Bindu Nanduri i Zhaohua Peng. "Comparative Proteomic Analysis of Cotton Fiber Development and Protein Extraction Method Comparison in Late Stage Fibers". MDPI AG, 2016. http://hdl.handle.net/10150/618719.

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The distinct stages of cotton fiber development and maturation serve as a single-celled model for studying the molecular mechanisms of plant cell elongation, cell wall development and cellulose biosynthesis. However, this model system of plant cell development is compromised for proteomic studies due to a lack of an efficient protein extraction method during the later stages of fiber development, because of a recalcitrant cell wall and the presence of abundant phenolic compounds. Here, we compared the quality and quantities of proteins extracted from 25 dpa (days post anthesis) fiber with multiple protein extraction methods and present a comprehensive quantitative proteomic study of fiber development from 10 dpa to 25 dpa. Comparative analysis using a label-free quantification method revealed 287 differentially-expressed proteins in the 10 dpa to 25 dpa fiber developmental period. Proteins involved in cell wall metabolism and regulation, cytoskeleton development and carbohydrate metabolism among other functional categories in four fiber developmental stages were identified. Our studies provide protocols for protein extraction from maturing fiber tissues for mass spectrometry analysis and expand knowledge of the proteomic profile of cotton fiber development.
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Belmasrour, Rachid. "The Distribution of Cotton Fiber Length". ScholarWorks@UNO, 2010. http://scholarworks.uno.edu/td/1216.

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By testing a fiber beard, certain cotton fiber length parameters can be obtained rapidly. This is the method used by the High Volume Instrument (HVI). This study is aimed to explore the approaches and obtain the inference of length distributions of HVI beard sam- ples in order to develop new methods that can help us find the distribution of original fiber lengths and further improve HVI length measurements. At first, the mathematical functions were searched for describing three different types of length distributions related to the beard method as used in HVI: cotton fiber lengths of the original fiber population before picked by the HVI Fibrosampler, fiber lengths picked by HVI Fibrosampler, and fiber beard's pro-jecting portion that is actually scanned by HVI. Eight sets of cotton samples with a wide range of fiber lengths are selected and tested on the Advanced Fiber Information System (AFIS). The measured single fiber length data is used for finding the underlying theoreti-cal length distributions, and thus can be considered as the population distributions of the cotton samples. In addition, fiber length distributions by number and by weight are dis- cussed separately. In both cases a mixture of two Weibull distributions shows a good fit to their fiber length data. To confirm the findings, Kolmogorov-Smirnov goodness-of-fit tests were conducted. Furthermore, various length parameters such as Mean Length (ML) and Upper Half Mean Length (UHML) are compared between the original distribution from the experimental data and the fitted distributions. The results of these obtained fiber length distributions are discussed by using Partial Least Squares (PLS) regression, where the dis-tribution of the original fiber length from the distribution of the projected one is estimated.
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Braden, Chris Alan. "Inheritance of cotton fiber length and distribution". Texas A&M University, 2005. http://hdl.handle.net/1969.1/4355.

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Fiber quality data from five upland cotton (Gossypium hirsutum L.) genotypes, which were grown at College Station, TX during 2001 and 2002, were subjected to diallel and generation means analyses to determine the potential for improvement of fiber length and to determine the inheritance of length distribution data. Four near-long staple (NLS) upland cotton genotypes and one short-staple genotype were crossed in all combinations, excluding reciprocals. Estimates of general (GCA) and specific combining ability (SCA) for fiber length based on Griffing’s diallel Model I, Method 4 were calculated for high volume instrumentation (HVI) upper-half mean (UHM) fiber length and advance fiber information system (AFIS) mean fiber length by weight (FLw), mean fiber length by number (FLn), upper quartile length by weight (Uqlw), fiber length distribution cross entropy (using 3 different standard or check distributions - CEA, CEB, and CEC), fiber length distribution kurtosis (FLwKurt), and fiber length distribution skewness (FLwSkew) for FLw. Across environments, GCA effects were significant for fiber length measurements of UHM, FLw, FLn, Uqlw, and SFCw and distribution measurements of CEA, CEB, FLwKurt, and FLwSkew. On the basis of GCA effects, TAM 94L-25 was the best parent to be used in a cross to improve upland fiber length, while Acala 1517-99 was the parent of choice to improve distribution among the 4 parents tested. The inheritance of AFIS fiber length measurements and distribution data was estimated using parents, F1, F2, and backcross generations. The magnitude and significance of the estimates for non-allelic effects in the parental combinations suggest that epistatic gene effects are present and important in the basic mechanism of AFIS fiber length and length distribution inheritance for the populations studied. Gene effects and variances for all AFIS fiber length and distribution data measurements were inherited differently in different environments and specific parental combination, suggesting environmentally specific mechanisms. Developing genotypes with enhanced fiber length and an optimal fiber length distribution should be a priority to improve spinning performance and product quality of U.S. upland cotton.
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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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Celikbag, Yusuf El Mogahzy Yehia. "Developing methods for detecting cotton fiber identity theft". Auburn, Ala., 2009. http://hdl.handle.net/10415/1768.

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Książki na temat "Coton fiber"

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Fang, David D., red. Cotton Fiber: Physics, Chemistry and Biology. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-030-00871-0.

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1941-, Yafa Stephen H., red. Cotton: The biography of a revolutionary fiber. New York: Penguin Books, 2006.

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Behery, H. M. Short fiber content and uniformity index in cotton. Oxon, UK: CAB International, 1993.

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Seagull, Robert, i Pam Alspaugh. Cotton fiber development and processing: An illustrated overview. Redaktorzy Cotton Incorporated i Texas Tech University. International Textile Center. Lubbock, Tex: International Textile Center, Texas Tech University, 2001.

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

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Columbus, Eugene P. Fiber and yarn properties of smooth- and hairy-leaf cotton. [Bethesda, Md]: U.S. Dept. of Agriculture, Agricultural Research Service, 1988.

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McCarty, J. C. Primitive cotton germplasm: Variability for yield and fiber traits.. Mississippi: Mississippi State University, 1995.

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Storey, Rita. Wool and cotton. North Mankato, Minn: Smart Apple Media, 2008.

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Low, It-Meng, Thamer Alomayri i 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. Wyd. 2. Manchester: International Institute for Cotton, Technical Research Division, 1988.

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Części książek na temat "Coton fiber"

1

Gooch, Jan W. "Cotton Fiber". W 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". W 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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Fadden, Kathleen. "The Ecology of the Colon". W 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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French, Alfred D., i Hee Jin Kim. "Cotton Fiber Structure". W 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, i Z. Jeffrey Chen. "Cotton Fiber Genomics". W 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". W 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 i Hafeezullah Memon. "Cotton Fiber Testing". W 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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Hill, Michael J. "Bile Acids and Colon Cancer: Future Prospectives". W Dietary Fiber, 553–58. Boston, MA: Springer US, 1986. http://dx.doi.org/10.1007/978-1-4613-2111-8_41.

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Klurfeld, David M. "Insoluble Dietary Fiber and Experimental Colon Cancer". W Dietary Fiber, 403–15. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4613-0519-4_30.

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Zieher, Carolyn. "Biochemistry of the Fiber". W 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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Streszczenia konferencji na temat "Coton fiber"

1

Peel, Larry D., i Madhuri Lingala. "Testing and Simulation of Stress-Stiffening Extreme Poisson’s Ratio Twisted Fiber-Reinforced Elastomer Composites". W 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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Kawasaki, Yoshihiro, Eiichi Aoyama, Toshiki Hirogaki, Tetsurou Ise i Eiji Hara. "Strength Criteria for Designing Hybrid-Fiber Reinforced Plastic Gears". W 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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Secareanu, Lucia-Oana, Irina-Mariana Sandulache, Elena-Cornelia Mitran, Mihaela-Cristina Lite, Adrian Alexandru Apostol, Ovidiu Iordache i Elena Perdum. "Protocol for identification and assessment of natural and synthetic textile fibers". W The 8th International Conference on Advanced Materials and Systems. INCDTP - Leather and Footwear Research Institute (ICPI), Bucharest, Romania, 2020. http://dx.doi.org/10.24264/icams-2020.v.12.

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Proper identification of textile materials is essential, as people use textiles for clothing and shelter, dental and medical devices, protective firefighting, or even military clothing. There have been several developments regarding fiber identification using instruments such as Fourier transform infrared spectroscopy, Raman spectroscopy, or electron microscopy. However, the traditional methods are prevalent as they are the cheapest alternative. In the present paperwork, an accelerated weathering test was conducted on two different textile materials – cotton (natural fiber) and polypropylene (synthetic fiber). Alternating cycles of UV exposure, along with humidity and relatively high temperatures were employed for the weathering test. In order to evaluate the degradation degree of the two fibers, the results were compared and investigated using non-destructive and micro-destructive analysis techniques such as Scanning Electron Microscopy (SEM), to evaluate the surface modifications of the fibers, and colorimetry, to quantify the color changes. In addition, Fourier-Transform Infrared Spectroscopy (FT-IR) indicated the modifications of functional groups that occurred after the weathering test. A non-destructive technique – X-Ray Diffraction (XRD) was also performed to obtain information about the crystalline structure. The obtained information will be used for cultural heritage studies.
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Eisenstein, Jessica, Peter Y. Wong i Caroline G. L. Cao. "Development of an Endoscopic Fiber Optic Shape Tracker". W 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 i Binbin Zhang. "The study on friction test between cotton fiber, cotton ,cotton seed and steel surface". W 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 i Christine Morgan. "Harvester-Based Cotton Fiber Quality Sensor". W 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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Divakara, S., A. R. Niranjana, G. N. Siddaraju, R. Somashekar, Alka B. Garg, R. Mittal i R. Mukhopadhyay. "Stacking Faults in Cotton Fibers". W SOLID STATE PHYSICS, PROCEEDINGS OF THE 55TH DAE SOLID STATE PHYSICS SYMPOSIUM 2010. AIP, 2011. http://dx.doi.org/10.1063/1.3605955.

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Gavalis, Robb M., Hua Xing, Peter Y. Wong, Lothar Lilge i Caroline G. L. Cao. "Endoscope Shape-Tracker Based on Embedded Fluorescent Dyes in an Optical Fiber". W 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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Stančić, Mladen, Branka Ružičić, Đorđe Vujčić, Dragana Grujić, Miroslav Dragić i Bojan Janković. "Influence of inkjet print parameters on thermal resistance of printed knitwears". W 10th International Symposium on Graphic Engineering and Design. University of Novi Sad, Faculty of technical sciences, Department of graphic engineering and design,, 2020. http://dx.doi.org/10.24867/grid-2020-p49.

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Textile materials are increasingly being subjected to the process of printing. The printing process with its parameters significantly affects the properties of textile materials and clothes made from these materials. This paper examines the effect of the parameters of inkjet printing on thermal resistance characteristics of printed textile materials. As the essential print parameters were selected tone value and a different number of passes. In this research were used knitted fabric materials of 100% cotton fibers and 100% polyester fibers. Results of the research demonstrated that, in addition to material composition, the inkjet printing process with its parameters have a significant influence on the thermal resistance of printed textile materials. The values of the thermal resistance of the printed samples show that the increase in the number of applications of ink in the printing results in a rise in the value on cotton knitwear, and decrease in thermal resistance value on polyester knitwear.
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Ancelotti, Antonio, Aureliano Ribeiro, Bruna Rennó i Felipe Eloy. "Experimental dynamic evaluation of cotton fiber composite material". W 24th ABCM International Congress of Mechanical Engineering. ABCM, 2017. http://dx.doi.org/10.26678/abcm.cobem2017.cob17-1544.

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