Relevant bibliographies by topics / Yarn

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Yarn'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 August 2024

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Journal articles on the topic "Yarn"

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Yanhong, Wei, Xinjin Liu, Xuzhong Su, and Zhao Zhimin. "Effects of spinning process and core yarn contents on yarn shape retention." International Journal of Clothing Science and Technology 32, no. 4 (December 26, 2019): 457–69. http://dx.doi.org/10.1108/ijcst-11-2018-0142.

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Purpose In order to develop high shape retention yarn and investigate the effects of spinning process and core yarn contents on the shape retention of yarn, in this paper, three kinds of yarns, JC/T400 18.5tex (55.6dtex) core-spun yarn, JC/T400 18.5tex (44.4dtex) core-spun yarn and JC18.5tex pure cotton yarn were spun by using the complete condensing Siro-spinning technology. The paper aims to discuss these issues. Design/methodology/approach In this paper, the core-spun yarns were spun by using the complete condensing spinning and Siro-spinning technology. Two key spinning processes, yarn twist factor and core yarn pre-draft ratio, were optimized by using the orthogonal test method first. Then, via the variable control method, the position of the core yarn, the position of the bell mouth and the center distance between two bell mouths were optimized, respectively, and corresponding optimal spinning process of the three yarns was determined. Finally, the yarns were spun under the optimal process, and the performance of the spun yarns was tested and compared. Findings Results show that the yarn twist factor affects yarn strength and hairiness, the position of bell mouth affects the evenness and hairiness of the yarn mainly, and the position of the core yarn affects the coverage and hairiness of the yarn. For the Z-twist spinning, the core yarn enters the front roller from the left side of two strands center, which is beneficial to improve the covering effect of core yarn, and reduce the pilling phenomenon of the yarn. The contents of core yarn affect indicators of the yarn shape retention, such as yarn strength, elastic recovery and abrasion resistance. Originality/value The shape retention of yarns affects the shape retention of fabrics, and the production of yarn with high shape retention is a key step in achieving shape retention of fabrics. At present, there are little studies on the shape retention of yarns, most researchers shave focused on shape retention of fabrics. Using the complete condensing Siro-spinning method to spin the core-spun yarn can improve the quality of the yarn. Compared with traditional ring-spinning yarns, the addition of the core yarn can improve the shape retention of the yarn.
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Sarıoğlu, Esin, Osman Babaarslan, and Münevver Ertek Avcı. "Effect of Filament Fineness on Composite Yarn Residual Torque." Autex Research Journal 18, no. 1 (March 1, 2018): 7–12. http://dx.doi.org/10.1515/aut-2016-0036.

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Abstract Yarn residual torque or twist liveliness occurs when the twist is imparted to spin the fibers during yarn formation. It causes yarn snarling, which is an undesirable property and can lead the problems for further processes such as weaving and knitting. It affects the spirality of knitted fabrics and skewness of woven fabrics. Generally, yarn residual torque depends on yarn twist, yarn linear density, and fiber properties used. Composite yarns are widely produced to exploit two yarns with different properties such on optimum way at the same time and these yarns can be produced by wrapping sheath fibers around filament core fiber with a certain twist. In this study, the effect of filament fineness used as core component of composite yarn on residual torque was analyzed. Thus, the false twist textured polyester filament yarns with different filament fineness were used to produce composite yarns with different yarn count. The variance analysis was performed to determine the significance of twist liveliness of filament yarns and yarn count on yarn twist liveliness. Results showed that there is a statistically significant differences at significance level of α=0.05 between filament fineness and yarn residual torque of composite yarns.
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El-Sayed, Eman Rashwan, and Eman Yehia Abd-Elkawe. "Production of Fine Count Yarns from Some Extra-long Egyptian Cottons on Different Spinning Systems." European Journal of Agriculture and Food Sciences 3, no. 5 (October 8, 2021): 90–96. http://dx.doi.org/10.24018/ejfood.2021.3.5.374.

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The current research was carried out to produce fine count yarns from extra-long Egyptian cotton varieties using compact and ring spinning systems.in addition, to compare between compact yarns and ring yarns in terms of their physical and mechanical properties. Three commercial extra-long staple Egyptian cottons Giza92, Giza93 and Giza 96 were used to produce four linear densities of 80, 100, 120 and 140 at 3.6 twist multiplier. Results obtained showed that Giza 92 was surpassed significantly other extra -long staple varieties. It recorded the highest mean values of yarn strength and yarn evenness While, the same variety recorded the lowest mean values of yarn hairiness and imperfections. Compact yarns were much better than yarns spun on the ring spinning in yarn strength, yarn elongation, evenness, yarn imperfections and yarn hairiness. Yarn count 80,s gave higher single yarn strength (20.89cN/tex), yarn elongation (5.03%) and yarn evenness (17.49%) and lower yarn hairiness (2.04) and imperfections than yarn count 140s. Single yarn strength, yarn elongation and yarn evenness were decreased with increasing yarn count. While the number of neps, hairiness, the number of thin and thick places were increased with increasing yarn count. Concerning, the effect of interaction between cotton varieties × yarn counts × spinning systems on yarn quality properties. Yarn count 80s recorded the highest mean values of yarn strength (23.14, 21.1 and 20.2 cN/tex) and yarn evenness (17.72, 16.53 and 16.79%) for varieties Giza92, Giza93 and Giza96, respectively for compact spinning system. Yarn strength at count 80, 100, 120 and 140 correlated negatively and highly significant with micronaire value and maturity ratio.
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Guo, Ying, and Xiaoming Tao. "Fiber packing density in the cross-section of low torque ring spun yarn." Textile Research Journal 88, no. 2 (November 13, 2016): 191–202. http://dx.doi.org/10.1177/0040517516677225.

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Fiber packing density in the yarn cross-section is one of the major parameters that reflect the yarn internal structure and its final properties. Taking the novel low torque ring spun yarn as the object, this work studied the fiber packing density of low torque ring spun yarns and conventional ring spun yarns under various axial tensions. With the increase of tension, the change of fiber packing state in low torque ring spun yarns and conventional ring spun yarns was compared qualitatively. In this study, fiber distribution in the cross-section of both Tencel yarns and wool yarns was carried out. The results show that, under the same axial tension, the packing density of fibers of low torque ring spun yarn is much higher than that of conventional ring spun yarn. The axial tension has greater influence on the fiber packing density for the conventional ring spun yarn. From the experimental results, in low torque Tencel yarn, the fiber packing density nearly reaches 0.9, which is the maximum value for close-packed yarn. Due to different fiber properties and yarn structure, it is difficult to form a close packing for fibers in low torque ring wool yarns. The current results indicate that low torque ring spun yarn has a more compact structure than conventional ring spun yarn. Compared with conventional ring spun yarns with the same count and twist levels, in low torque ring spun yarns, more fibers contribute to the yarn breaking strength.
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Yang, Rui Hua, Yaya Xu, and Qianqian Deng. "Multisection color-blended wool yarn produced by a new three-channel spinning method." Journal of Engineered Fibers and Fabrics 14 (January 2019): 155892501985897. http://dx.doi.org/10.1177/1558925019858971.

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By dynamically controlling the feeding amount and feeding ratio of the three feeding rollers with program logical control system under the requirements of yarn spinning parameters, it is possible to effectively configure the final yarn density and the blending ratio of three components to produce multisegment gradient yarns, segment-color yarn, and segment-color slub yarn named as multisegment blending yarns. The yarn-spinning new method was proposed. Different kinds of fancy yarns including gradient yarns, segment color yarns, and slub yarns were produced. The fiber blending effects were demonstrated by slices of yarn cross section, and the surface morphology of yarns were figured out by the photo of yarns. Integrally knitting seamless sweater and different type of pattern were designed and knitted by multisegment blending yarns. The free change of colors along the length direction on a single yarn provides an effective method for integrated rapid design and production of sweaters through mutual design of the overall pattern and the structure of the fabric.
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Erdumlu, Nazan, Bulent Ozipek, and William Oxenham. "The structure and properties of carded cotton vortex yarns." Textile Research Journal 82, no. 7 (January 19, 2012): 708–18. http://dx.doi.org/10.1177/0040517511433150.

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The properties and spinning limits of carded cotton vortex spun yarns were investigated through the progressive change in yarn count. The yarns were tested for structural and physical properties. Critical parameters were obtained, including the ratio of wrapper fibers to core fibers, proportion and average length of different structural classes in the yarn. The structural analysis revealed that the wrapper fibers constitute an increasing proportion of the fibers as the yarn becomes finer. Moreover, the proportion and average length of different structural classes in vortex spun yarns change with yarn count. The analysis of the data obtained from yarn testing showed that as the yarn becomes finer, the yarn becomes more uneven and the number of yarn imperfections markedly increase. On the other hand, the tensile properties of vortex spun yarns remain almost unchanged as the yarn gets finer.
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N., Anbumani, C. Rameshkumar, P. Anandkumar, P. Senthilnathan, and R. Jeevitha. "COMPARITIVE STUDIES ON RING ROTOR AND VORTEX YARN KNITTED FABRICS." AUTEX Research Journal 8, no. 4 (December 1, 2008): 100–105. http://dx.doi.org/10.1515/aut-2008-080402.

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Abstract Ring, Rotor and Air vortex spinning systems provide yarn with different structures and properties. Each system has its limitations and advantages in terms of technical feasibility and economic viability. 30's Ne, 100%cotton yarns were produced from the above systems and knitted in single jersey machine .The Rotor Spun yarns found with frequent breakage during knitting. Comparatively good knitting performances have shown by the Ring and Air vortex yarns. Tensile, evenness and hairiness of the yarns and bursting strength, abrasion resistance, pilling, drapability and color matching of the knitted fabrics were studied. The Ring spun yarns have high strength, low imperfection, and good bursting strength. It has high 'S3' value. Abrasion resistance of Rotor and Vortex yarns made fabrics were found higher than the ring spun yarns. Ring yarn knitted fabric has high bursting strength, Air-vortex yarn knitted fabric has poor drape due to stiffer yarn structure and the MVS yarn fabric has poor pilling resistance. Rotor, MVS yarns made fabrics have good abrasion resistance. Drapability of Vortex yarn knitted fabrics was poor than ring and Rotor yarn knitted fabrics. Good and equal depth of dye shade was found with Ring and Air vortex yarn made knitted fabrics. Ring yarn knitted fabric has shown smooth feeling than the other two fabrics.
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Pramanik, P., and Vilas M. Patil. "PHYSICAL CHARACTERISTICS OF COTTON/POLYESTER CORE SPUN YARN MADE USING RING AND AIR-JET SYSTEMS." AUTEX Research Journal 9, no. 1 (March 1, 2009): 14–19. http://dx.doi.org/10.1515/aut-2009-090103.

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Abstract The manufacture of core yarn from polyester-cotton is one of the most important developments in the textile industry. The use of core yarns is mainly aimed at improving the strength, comfort, durability, aesthetics, and other functional properties of the final yarn. This article reports the results of investigation of core spun yarns made from polyester filament as core and cotton as sheath material manufactured using both ring and air-jet spinning systems. Polyester filaments with different proportions were chosen for the core component and cotton was used as the sheath. A total of twelve different core yarns were made on different spinning systems (i.e. six on air-jet and six on ring frame systems) and the yarn properties were compared with those of 100% cotton ringspun yarn. It was observed that core yarns had improved physical properties compared to 100% cotton ringspun yarn in many respects such as yarn strength, elongation, energy to break, and yarn imperfections. Only airjet core yarn showed lower yarn strength than 100% cotton yarn but the same yarn excelled in other properties compared to 100% cotton yarn.
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HAKAN, ÖZDEMİR. "Effects of sizing and yarn structural properties on the physical properties of combed and carded cotton ring yarns." Industria Textila 69, no. 02 (May 1, 2018): 81–86. http://dx.doi.org/10.35530/it.069.02.1329.

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Warp yarns, prepared as warp beam, are exposed to various forces at weaving loom. Warp yarns are bended on the back rest, subjected to friction from drop wires and healds. They are also exposed to friction and impact at reed and thereby abraded. Yarns are sized in order to increase their resistance to these effects. Sizing agents ensure that warp yarns can be weaved with sizing process. On the other hand, yarn count and yarn type (combed or carded yarn) are the significant yarn structural properties that determine and so affect the physical properties of yarn. The main reason and objective this study is to investigate the effects of yarn structural parameters (yarn count and yarn type) and sizing on the physical properties (breaking strength, elongation at break, hairiness, friction coefficient) of 100% cotton carded and combed ring yarns, sized with four different sizing agents, which were not studied in the references. It is observed that sizing process cause to decrease in the hairiness up to 99% and in friction coefficients of combed and carded yarns whereas to increase in the breaking strengths of combed and carded yarns. And also, the combed yarns had better tensile and frictional properties than carded yarns.
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Neckář, B., S. M. Ishtiaque, and L. Švehlová. "Rotor Yarn Structure by Cross-Sectional Microtomy." Textile Research Journal 58, no. 11 (November 1988): 625–32. http://dx.doi.org/10.1177/004051758805801102.

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A mathematical model is suggested for studying the radial packing density of yarn, and the proposed model is used for a comparative study of ring and rotor spun yarns. The results show that rotor spun yarn consists of a smaller number of fibers in the cross section compared to ring spun yarn, which explains the lower strength of rotor yarn. Although the radial packing density of both yarns is non-uniform, that of rotor yarn is nearer the yarn axis and less towards the yarn surface compared to ring spun yarn.
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Dissertations / Theses on the topic "Yarn"

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Goksoy, M. "A study of yarn-on-yarn abrasion." Thesis, University of Manchester, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.382649.

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Chang, Lingli, and mikewood@deakin edu au. "An investigation of yarn hairiness." Deakin University. School of Engineering and Technology, 2002. http://tux.lib.deakin.edu.au./adt-VDU/public/adt-VDU20060823.141926.

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Yarn hairiness affects not only the quality of products, but also the productivity in spinning and weaving. Too much yarn hairiness is undesirable for many end uses as well as the spinning and post spinning processes. The main aims of this project are to examine the hairiness features of various yarns and to reduce yarn hairiness. The thesis covers five related areas – hairiness assessment, factors affecting yarn hairiness, the hairiness of newly developed yarns, yarn hairiness reduction, and effect of yarn hairiness on the energy consumption in ring spinning. The worsted cashmere, pure wool and wool/cashmere blend yarns were employed to investigate the effect of some fibre parameters on the yarn hairiness. A single exponential distribution of the hair-length was confirmed first, using the data from the Zweigle G565 Hairiness Meter. A linear relationship was observed between the blend ratio and the hairiness indexes. In particular, the effect of fibre crimp or curvature on yarn hairiness is examined. The theory of yarn hairiness composition was also developed further. The effect of draft ratio and spindle speed on the hairiness of worsted wool yarn was examined next with a factorial experiment design. Several new hairiness indexes, namely the relative hairiness indexes, have been used to explain the results obtained. In the investigation of the hairiness of newly developed yarns, the hairiness of the Compact Spun and Roller-Jet-Spun yarns was examined first. The composition of the yarn hairiness, the hair-length distribution, and the effect of test speed on yarn hairiness were then studied. An important finding is that for both yarns, the predominant hairiness feature is the looped hairs. A comparison of the hairiness of Solospun yarns and the equivalent ring spun wool yarns was undertaken. The hair-length distribution of the Solospun yarn was examined first. The Solospun yarns used had fewer hairs in most hair-length groups and lower variations in hairiness. In addition, the effect of twist level and spindle speed on the hairiness of Solospun and conventional ring spun yarns has also been discussed. A novel approach of reducing yarn hairiness – spinning with a ‘Diagonal’ yarn path was examined next. Both ‘Left Diagonal’ and ‘Right Diagonal’ yarn arrangements were studied. A new finding is that the ‘Right Diagonal’ yarn path leads to reduced hairiness for the Z-twist yarn, while yarn evenness and tenacity are not as sensitive to the modified yarn path. The mechanism of hairiness reduction with the ‘Diagonal’ yarn path has been discussed. The spinning performance of “Right Diagonal” yarn arrangement has also been evaluated. Finally, the effect of yarn hairiness on the energy consumption in ring spinning has been investigated theoretically and experimentally. A theoretical model has been developed, which represents the first attempt at theoretically investigating the influence of yarn hairiness on energy consumption during the winding stage of ring spinning. The experimental results have generally confirmed predictions of this model. Recommendations for further research in this area have also been made in the concluding chapter of this thesis.
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He, Peng. "Process-structure-property relationships of yarns produced on the card-spinning system." Thesis, Available online, Georgia Institute of Technology, 2004:, 2004. http://etd.gatech.edu/theses/available/etd-06072004-131148/unrestricted/he%5Fpeng%5F200405%5Fms.pdf.

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Daniel, Latson Trudie I. "A GRIOT’S YARN." Kent State University / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=kent1310406150.

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Giannokostas, Vasileios. "Policy-Driven YARN Launcher." Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-204461.

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In recent years, there has been a rising demand for IT solutions that are capable to handle vast amount of data. Hadoop became the de facto software framework for distributed storage and distributed processing of huge datasets with a high pace. YARN is the resource management layer for Hadoop ecosystem which decouples the programming model from the resource management mechanism. Although Hadoop and YARN create a powerful ecosystem which provides scalability and flexibility, launching applications with YARN currently requires intimate knowledge of YARN’s inner workings. This thesis focuses on designing and developing support for a human-friendly YARN application launching environmen twhere the system takes responsibility for allocating resources to applications. This novel idea will simplify the launching process of an application and it will give the opportunity to inexperienced users to run applications over Hadoop.
De senaste åren har haft en ökad efterfrågan på IT-lösningar som är kapabla att hantera stora mängd data. Hadoop är ett av de mest använda ramverken för att lagra och behandla stora datamängder distribuerat och i ett högt tempo. YARN är ett resurshanteringslager för Hadoop som skiljer programmeringsmodellen från resurshanteringsmekanismen. Även fast Hadoop och YARN skapar ett kraftfullt system som ger flexibilitet och skalbarhet så krävs det avancerade kunskaper om YARN för att göra detta. Detta examensarbete fokuserar på design och utveckling av en människovänlig YARN applikationsstartsmiljö där systemet tar ansvar för tilldelning av resurser till program. Denna nya idé förenklar starten av program och ger oerfarna användare möjligheten att köra program över Hadoop.
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Mirfakhrai, Tissaphern. "Carbon nanotube yarn actuators." Thesis, University of British Columbia, 2009. http://hdl.handle.net/2429/17441.

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The first demonstration of electromechanical actuation in carbon nanotubes (CNTs), aligned in the form of a twisted yarn, is presented in this thesis. Sheets of CNTs have been known to actuate when charged electrochemically. When an electric potential is applied between a sheet of CNTs and another electrode, both submersed in an electrolyte, the sheet expands. Actuation loads and stresses are low (< 33 MPa); this is partly due to the random orientation of CNTs in those sheets. When actuated under similar conditions, the yarns show significantly higher stress (2.0±0.4 x 10⁸ Pa) with similar strain (0.6 %). However, unlike the sheets, the yarns contract when the electric potential is applied; this is quite unexpected. The mechanism of this contraction is studied and is related to the insertion of ions in the yarn and the structural changes that take place in the yarn due to its helical twisted structure. A model is presented, relating the actuation strain with yarn geometry (diameter, twist rate, internal packing), electrolyte properties such as ion size, and applied potential. The actuation and mechanical properties of the yarn are studied in various electrolytes. Characterization techniques such as cyclic voltammetry and electrochemical impedance spectroscopy are employed to study the charge storage behaviour of the yarn, showing gravimetric capacitances between 10-60 F/g. It is also shown that the yarns can convert mechanical energy into electrical energy, and are thus capable of measuring mechanical forces. Their behaviour as mechanical force sensors is characterized, showing sensitivities about 2.0±0.6 x 10−⁵ V/MPa. The yarns are superior in work density to piezoelectric actuators when normalized by active material. Creep, can still be an issue, while a tensile modulus of about 16±5 GPa and a tensile strength of about 900 MPa mean that creep is much less than other types of artificial muscles at similar loads. Torsional actuation is also shown to take place if one end of the yarn is free to rotate. Thus, the CNT yarn actuators show the highest achieved stress among polymer artificial muscles and are the first to actuate torsionally, opening a wide range possibilities for applications.
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Sumner, Mark. "Continuous yarn processing systems." Thesis, University of Manchester, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.601466.

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The objective of the Engineering Doctorate project was the development of a continuous yam dyeing system which could meet the needs of a changing textile industry. Through an examination of the changes in the industry, it was found that the system must incorporate waste minimisation principles, be flexible and responsive to the demands of the fashion industry and provide the yam dyer with short lead times. Two yam processing systems were identified and investigated to determine whether they could be used to fulfil the aims of the project. The first system was based on the Fibre 'M' Yam Texturing and Dyeing process previously developed at UMIST. The second was a new development referred to as the Sealed Applicator Device (SAD). It had been shown in the past that the Fibre 'M' based system could simultaneously texture and dye polyester yam to a relatively high standard of fixation and bulk. However, through the process investigation presented here it was found that the system lacked flexibility, ease of use and, in addition, its environmental impact could be considerable. The investigation of the SAD process proved to be more fruitful. It was found that the SAD process could be used to impregnate single ends of yam with liquor to a high degree of accuracy and control. Laboratory trials sho~ed that the SAD system could be used to impregnate worsted yam with dye liquor levelly at yam speeds up to 500 m1min at liquor to goods ratios as low as 0.3 : 1. Also it was shown that the SAD system could be used as a high speed yam washing device as well as a yam drying device. Through a combination of the impregnation, washing and drying capabilities of the SAD process, in conjunction with an autoclave stage, it was demonstrated that the SAD process could be used to continuously dye, wash and dry yams at high speed to commercial standards of penetration, levelness and fastness. The potential savings for a yam dyer through the use of the SAD system were explored. It was also shown, through commercial trials, that the SAD system could be used as an integral part of a simultaneous yam folding, setting, conditioning and lubricating process for worsted yams. Comparable levels of setting, conditioning and lubricating to the industry standard were achieved using the SAD process, with the potential for considerable saving for the spinner.
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Goktepe, Fatma. "The effect of yarn structure on the deformation of the yarn cross-section." Thesis, University of Leeds, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.416091.

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Hasan, M. M. B., M. Offermann, M. Haupt, A. Nocke, and Ch Cherif. "Carbon filament yarn-based hybrid yarn for the heating of textile-reinforced concrete." Sage, 2014. https://tud.qucosa.de/id/qucosa%3A35610.

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In this study, the application of carbon filament yarn (CFY)-based conductive hybrid yarn as the heating element in a textile-reinforced concrete structure is reported. For this purpose, a hybrid yarn having a core-sheath structure (the core is made of carbon filament yarn and the sheath consists of a mixture of short glass and polypropylene fibres) is manufactured by DREF-2000 spinning technique and integrated into textile structure by tailored fibre placement method. Heat can be generated in the concrete structure by passing electric current through the conductive carbon filament yarn core of the hybrid yarn using the principle of resistive heating, where the sheath acts as the protection and isolation layer. From the initial investigations made on a small concrete specimen, important information is gathered and a large concrete slab with integrated conductive hybrid yarn is manufactured. The heat ability and the comfort level of the manufactured concrete slab are measured. The investigations have revealed the potential of using such hybrid yarn for a pointwise heating of the concrete surface for possible appliance in outdoor furniture.
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Kuganesan, Srijeyanthan. "Distributed Resource Management for YARN." Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-187044.

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In the last year, Hadoop YARN has become the defacto standard resource management platform for data-intensive applications, with support for a wide range of data analytics platforms such as Apache Spark, MapReduce V2, MPI, Apache Flink, and Apache Giraph. The ResourceManager fulfills three main functions: it manages the set of active applications (Applications service), it schedules resources (CPU, memory) to applications (the FIFO/Capacity/Fair Scheduler), and it monitors the state of resources in the cluster (ResourceTracker service). Though YARN is more scalable and fault-tolerant than its predecessor, the Job-Tracker in MapReduce, its ResourceManager is still a single point of failure and a performance bottleneck due to its centralized architecture. Single point of failure problem of YARN has been addressed in Hops-YARN that provides multiple ResourceManagers (one active and others on standby), where the ResourceManager’s state is persisted to MYSQL Cluster and can quickly be recovered by a standby ResourceManager in the event of failure of the active ResourceManager. In large YARN clusters, with up to 4000 nodes, the ResourceTracker service handles over one thousand heartbeats per second from the nodes in the cluster (NodeManagers), as such become a scalability bottleneck. Large clusters handle this by reducing the frequency of heartbeats from NodeManagers, but this comes at the cost of reduced interactivity for YARN (slower application startup times), as all communication from the ResourceManager to NodeManagers is sent in response to heartbeat messages. Since Hops-YARN is still using a centralized scheduler for all applications, distributing the ResourceTracker service across multiple nodes will reduce the amount of heartbeat messages that need to be processed per ResourceTracker, thus enabling both larger cluster sizes and lower latency for scheduling containers to applications. In this thesis, we will scale-out the ResourceTracker service, by distributing it over standby ResourceManagers using MySQL NDB Cluster event streaming. As such, the distributed Resource Management for YARN that is designed and developed in this project is a first step towards making the monolithic YARN ResourceManager scalable and more interactive.
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Books on the topic "Yarn"

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Pickavance, Lynne. Grandma's yarn. Reigate: Brainwaves Ltd., 2000.

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Barnett, Mac. Extra yarn. New York: Balzer & Bray, 2011.

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Durant, Judith. Yarn stash wonders: 101 yarn-shop favorites. Newton Abbot: David & Charles, 2007.

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Spinazzi-Lucchesi, Chiara. The Unwound Yarn. Venice: Edizioni Ca' Foscari, 2018. http://dx.doi.org/10.30687/978-88-6969-232-1.

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This book reviews certain of the most important archaeological finds of textile tools, in order to draw a picture of the spinning and weaving technologies adopted in the Levant and Egypt from the Neolithic to the Persian period. A brief description of the objects found at several sites is provided to highlight differences of materials and tool design in order to better understand developments in weaving technology across this region. Textile tools housed in the Museo Egizio di Torino are also examined here for the first time. These include spindles and spindle whorls, bone spatulae and needles, which for the most part originate from Schiaparelli’s excavations at the Workers’ village of Deir el-Medina. A general analysis is provided, which compares these objects to the tools known from other sites in Egypt, as well as a catalogue, which provides further description and exact measurements for each object of the collection.
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Sefton, Maggie. A Deadly Yarn. New York: Penguin Group USA, Inc., 2008.

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Snow, Tamie. Tiny Yarn Animals. New York: Penguin USA, Inc., 2009.

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Yarn, Yarn, Yarn. Skyhorse Publishing Company, Incorporated, 2014.

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Yarn Spinner a Yard of Thought. Halo Publishing International, 2016.

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Thompson, Joyce, and Tamara Marston. Yarn. Audible Studios on Brilliance, 2016.

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Yarn. Bloodaxe Books, 2015.

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Book chapters on the topic "Yarn"

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Weik, Martin H. "yarn." In Computer Science and Communications Dictionary, 1939. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_21293.

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Gooch, Jan W. "Yarn." In Encyclopedic Dictionary of Polymers, 821. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_12945.

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Iredale, John A. "Prelims - Yarn Preparation." In Yarn Preparation, i—viii. Rugby, Warwickshire, United Kingdom: Practical Action Publishing, 1992. http://dx.doi.org/10.3362/9781780443942.000.

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Iredale, John A. "1. Yarn Preparation." In Yarn Preparation, 1–39. Rugby, Warwickshire, United Kingdom: Practical Action Publishing, 1992. http://dx.doi.org/10.3362/9781780443942.001.

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Lehmann, Beata, and Claudia Herzberg. "Yarn Constructions and Yarn Formation Techniques." In Textile Materials for Lightweight Constructions, 103–57. Berlin, Heidelberg: Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-46341-3_4.

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Gooch, Jan W. "Bouclé Yarn." In Encyclopedic Dictionary of Polymers, 91. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_1528.

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Gooch, Jan W. "Bulk Yarn." In Encyclopedic Dictionary of Polymers, 99. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_1672.

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Gooch, Jan W. "Cabled Yarn." In Encyclopedic Dictionary of Polymers, 107. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_1785.

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Gooch, Jan W. "Carded Yarn." In Encyclopedic Dictionary of Polymers, 119. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_1967.

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Gooch, Jan W. "Cockled Yarn." In Encyclopedic Dictionary of Polymers, 151. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_2526.

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Conference papers on the topic "Yarn"

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Dippolito, Mario, Youqi Wang, Ying Ma, Chian-Fong Yen, James Q. Zheng, and Virginia Halls. "Real Scale Simulation of Ballistic Tests for Multi-Layer Fabric Body Armors." In ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-39538.

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The bottle-neck issues to resolve for numerical simulation of real scale ballistic tests of fabric body armors are computer capacity limitation and prohibitive computational cost. It is not realistic to use micro-level computer simulations for an open end design process. Most numerical simulations are only applicable for small scale parametric analyses, which could facilitate apprehension of fabric failure mechanisms during ballistic impact, but not applicable for the design process. In this paper, a sub-yarn model, the digital element approach, is applied to simulate real scale ballistic tests for soft body armors. In this approach, a yarn is discretized into multiple digital fibers and each fiber is discretized into many digital elements. In order to improve efficiency, two hybrid element mesh concepts are investigated: area based hybrid mesh and yarn based hybrid mesh. The area based hybrid mesh procedure is similar to one utilized in the conventional finite element approach. A fine element mesh is adopted in the area near the impact center; a course element mesh in the area far away. However, numerical simulation results show that the stress wave travels along the principal yarns at the speed of sound immediately after ballistic impact. High yarn stress develops quickly from the impact center to a distance along the principal yarn. As such, the area based hybrid mesh approach fails to obtain improved computer efficiency without loss of accuracy. Because the high stress only develops within principal yarns after a ballistic impact, a yarn based hybrid element mesh procedure is adopted. In this procedure, only principal yarns and yarns near principal yarns are discretized into fine digital fibers; other yarns are discretized into coarse digital fibers. Because only a few principal yarns resist load in a typical ballistic impact, the yarn based hybrid technique could improve simulation efficiency up to 90–95% without sacrificing accuracy. A numerical tool is then developed to generate fabric with a yarn based hybrid mesh. Accuracy of the approach is analyzed. The hybrid mesh technique is applied to simulate real scale ballistic tests of ballistic armors made of 4 to 20 piles of 2-D plain woven fabrics. Numerical results are compared to real scale standard ballistic results.
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Buenafe, Susan, Luis Guzman, Namrata Kannan, Kristine Mendoza, Nuno Jardim Nunes, Valentina Nisi, Pedro Campos, Frederica Gonçalves, Miguel Campos, and Paulo Freitas. "Yarn." In NordiCHI '14: The 8th Nordic Conference on Human-Computer Interaction. New York, NY, USA: ACM, 2014. http://dx.doi.org/10.1145/2639189.2670284.

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DYER, W. HENRY, and CHARLES E. BAKIS. "DAMPING BEHAVIOR OF DRY AND EPOXY- IMPREGNATED CARBON NANOTUBE YARN." In Proceedings for the American Society for Composites-Thirty Seventh Technical Conference. Destech Publications, Inc., 2022. http://dx.doi.org/10.12783/asc37/36511.

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Multiwalled carbon nanotubes (CNTs) are believed to add beneficial damping to fiber reinforced polymer composites on account of their weak, reversible inter-wall bonding and CNT/polymer bonding. An effective way to add a large volume fraction of CNTs to a fiber composite is to form the CNTs into condensed yarns and add the yarns to the interlayer regions of composites with the CNTs oriented along the primary loading direction. To address the ongoing need for additional data on the damping provided to fiber composites by CNT yarns, the current investigation focuses on the tensile damping behavior of a commercially available yarn with and without epoxy impregnation. Based on quasi-static tensile tests using cross-sectional areas measured by ethanol immersion testing, dry yarn was observed to have an elastic modulus of 109 GPa and an ultimate tensile strength of 1.30 GPa, while impregnated yarn had a modulus of 62 GPa and a strength of 0.813 GPa. Dry and impregnated yarns exhibited a ratcheting mechanism, where permanent strain is accumulated with repeated load cycling. Through dynamic mechanical analysis, it was shown that both dry and impregnated yarns exhibited high damping, with average initial loss factors of 0.110 and 0.0953, respectively. With continued cycling and increased strain, the storage modulus of impregnated yarns increased by 450%, while the loss modulus increased by 256% and the loss factor decreased by 35%. Dry and impregnated yarns exhibited quasi-static and dynamic properties that were highly sensitive to loading history, although impregnated yarns showed greater degrees of change over larger numbers of loading cycles. It is shown that an established micromechanical model can predict to within 6% the loss factor of a [90]6 hybrid carbon/epoxy laminate containing 10 vol% CNT yarns aligned in the 0° orientation, based on known dynamic properties of the impregnated yarn and the baseline laminate without CNTs.
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Demircan, O¨, A. R. Torun, T. Kosui, A. Nakai, and H. Hamada. "Bending and Impact Properties of Biaxial Weft Knitted Composites." In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-64964.

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In order to improve the mechanical properties of weft knitted fabric, straight yarns both in weft and warp directions can be integrated. These types of reinforcements are called biaxial weft knitted structures. Biaxial weft knitted fabrics include weft and warp yarn layers, which are held together by a stitching yarn system. Reinforcing yarns, e.g. glass or aramid fibers, can be used within all yarn systems. They provide necessary strength and stiffness of the fabric [1]. The present work concentrates on the mechanical properties of biaxial weft knitted composites. Mainly the effect of stitch yarn type such as aramid, glass and nylon and biaxial, warp and weft, yarn type such as aramid and glass were investigated. Six plies composite panels were fabricated by hand lay-up lamination method. Volume fraction (Vf) of all composites were kept constant. After production of composites, bending and impact tests had been conducted. GF-GF-NY composites exhibited superior flexural property than other tested composites. It was found that GF-GF-AR composites have higher impact properties (total energy and maximum load) than other tested composites. Better mechanical properties can be achieved by using aramid stitch yarn with combination glass warp and glass weft yarns. A better interfacial bonding of aramid stitch yarn seemed to be cause of this result. After impact test, fracture aspects of reverse side of weft knitted composites were analyzed. The crack propagation was explained by visual inspection. Moreover, impact damage for tested materials was evaluated by cross-sectional observations. For the better understanding of the fracture behavior, schematic drawings of all kind of specimens were drawn. To analyze the damage behavior of tested specimens, the damage lengths were measured. By this observation, the tendency between impact energy and crack length was showed.
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David, N. V., and M. R. Ahmad. "An Experimental Study on the Effect of Natural Rubber Coating on Tensile Properties of Dyneema® Single Yarn." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-87143.

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The effect of natural rubber (NR) coating on the quasi-static tensile properties of unidirectional Dyneema® SK-76 single yarn is experimentally studied. Single Dyneema® SK-76 yarns are uniformly coated with pre-vulcanized natural rubber latex. Quasi-static tensile tests are performed on plain (uncoated) and NR-coated samples at the strain rates of 0.006 s−1, 0.06 s−1 and 0.6 s−1. The force and strain at peak, and the tenacity of the plain and NR-coated yarns are obtained for each strain rate. The results show that the peak force in the plain samples increases with strain rate to a maximum of 163 N. The tenacity (breaking force per denier) of the uncoated yarns also, in correspondence, increases with strain rate. In contrast, the tenacity of the NR-coated samples remained constant at but a lower value than that of the plain samples. It is observed that peak force sustained by the NR-coated yarns is insensitive to strain rate and up to 560% higher than that supported by the plain yarns. The peak strain of both the plain and NR-coated samples varies with strain rate in a comparable fashion. However, the peak strain values of the NR-coated yarn are greater by an average of 20% than of the plain yarn. The experimental data thus reveal that NR coating has a constructive effect on the peak force and peak strain of the yarn but decreases its tenacity to a constant value. Micrographs of the fractured samples obtained from Field Emission Scanning Electron Microscope are studied to explore the role of NR in the failure mechanism of the coated yarn.
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Uddin, Mohammed Jasim, Tarik J. Dickens, Jin Yan, David O. Olawale, Okenwa I. Okoli, and Federico Cesano. "Solid-State Dye Sensitized Optoelectronic Carbon Nanotube-Wires: An Energy Harvesting Damage Sensor With Nanotechnology Approach." In ASME 2012 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/smasis2012-8200.

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A novel preparation method of solid state photovoltaic carbon nanotubes (CNT) yarns has been successfully developed by depositing and grafting TiO2 thin films on CNT yarn substrates using a simple sol–gel method and designed for use in structural health monitoring (SHM) applications. The interaligned, ultrastrong and flexible CNYs display excellent electrical conductivity, mechanical integrity and their catalytic properties have been successfully used as working and counter electrodes. The TiO2 nanoparticles have been found to form a homogeneous thin film on the yarn surface, which shows efficient photovoltaic properties with remarkable stability when exposed to simulated solar light (AM 1.5). The yarns’ structure is not altered upon sol-gel treatment and light exposure. The TiO2 film is firmly anchored and the photovoltaic performance is retained even after multiple irradiation cycles. This preparation technique can also be applied to CNT yarn reinforced composite for an innovative in-situ and real-time self damage-sensing properties with infused triboluminescent (TL) materials.
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Roy, A. K. "A Three-Dimensional Stress Analysis of Woven Fabric Composites Based on a Mixed Variational Model and Spline Approximation." In ASME 1998 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/imece1998-1180.

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Abstract The stiffness of fabric (woven) composites has been well studied. However, the failure mechanism of this class of composites is not well understood. The prediction of the stiffness of woven composites is relatively simple compared to the prediction of strength, and has been done extensively in the literature. It is known that the yarn crimping in woven fabric composites plays an important role in the failure initiation process. In the vicinity of yarn crimping of two-dimensional fabric (woven) architecture, two perpendicular yarns crimp over and under to each other. Due to the perpendicular yarn crimping, even under the application of simple unidirectional load, the stresses in the vicinity of the yarn crimping are three dimensional. Further, in situ experimental observation of damage initiation in textile composites reveals that the damage initiates in the form of interface cracks in the vicinity of yarn crimping, which is strongly influenced by the interlaminar stresses at the interface region. Thus an accurate prediction of the interlaminar stresses at the interface region is needed to reliably analyze damage and failure in woven composites. Most of the research work in this area, however, is based on two-dimensional stress analysis which does not reliably predict the interlaminar stresses. Further, traditional displacement-based finite-element analysis only predicts stresses accurate at the Gaussian integration points; thus, even three-dimensional finite element analysis does not yield accurate interlaminar stresses at the interface. A mixed three-dimensional variational model has been derived for stress analysis of a representative volume element (RVE) of woven fabric composites, based on the Reissner variational principle. In this model, each yarn is modeled as a homogeneous orthotropic medium, and the matrix regions that exist around the wavy yarns are also represented as separate subregions in the model. The RVE of a two-dimensional woven fabric composite is shown in Figure 1. The representative volume element (RVE) of the model is divided into several subregions; each subregion is occupied by a characteristic fabric yarn (Figure 2). The yarns of characteristic self-similar crimping are lumped together and represented in one subregion, as shown in Figure 2. In order to accurately predict the characteristic damage (crack initiation and its propagation), the equilibrium of stresses is satisfied pointwise everywhere in the model, and the inter-yarn stress compatibility is enforced in the model. The in-plane stresses within a yarn are assumed to vary linearly in the thickness direction, and the expressions for the interlaminar stresses are obtained by satisfying the three-dimensional equilibrium equations. Further, to reduce the computational size of the problem, the thickness integration of the quantity in the variational principle is performed. Due to crimped profile of the yarns (i.e., not being parallel to RVE axes) Leibnitz’s theorem must be used to perform the thickness integration. After performing the thickness integration, the model yields a set of first order partial differential equations. Based on the linear variation of the in-plane stresses in the thickness direction, the principle yields 23 unknown variables for each subregion. The RVE, without any inter-yarn and intra-yarn cracks, contains six subregion. A finite element approach is taken to obtain an approximate solution to the set partial differential equations. For the finite element approximation, an energy norm is defined using the quantities obtained in the set of partial differential equations. A set of overlapping cubic splines is used as the shape functions for the finite element formulation. The Rayleigh-Ritz approximation technique is used to derive the stiffness matrix of the problem and to determine the unknown quantities. Further, the formulation being based on the mixed variational principle, a combination of stress and displacement can prescribed as boundary condition, which cannot be achieved in any displacement-based finite element.
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Xu, Luna, Min Li, and Ali R. Butt. "GERBIL: MPI+YARN." In 2015 15th IEEE/ACM International Symposium on Cluster, Cloud and Grid Computing (CCGrid). IEEE, 2015. http://dx.doi.org/10.1109/ccgrid.2015.137.

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Vavilapalli, Vinod Kumar, Arun C. Murthy, Chris Douglas, Sharad Agarwal, Mahadev Konar, Robert Evans, Thomas Graves, et al. "Apache Hadoop YARN." In SOCC '13: ACM Symposium on Cloud Computing. New York, NY, USA: ACM, 2013. http://dx.doi.org/10.1145/2523616.2523633.

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Al-Attar, Kinan, Aamir Shafi, Hari Subramoni, and Dhabaleswar K. Panda. "MPI4Spark Meets YARN: Enhancing MPI4Spark through YARN support for HPC." In 2023 IEEE International Conference on Big Data (BigData). IEEE, 2023. http://dx.doi.org/10.1109/bigdata59044.2023.10386120.

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Reports on the topic "Yarn"

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Stannard, Casey R., and Kathy K. Mullet. Yarn Design Characteristics Which Influence Crafters. Ames: Iowa State University, Digital Repository, November 2015. http://dx.doi.org/10.31274/itaa_proceedings-180814-9.

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Tallant, D. R., M. J. Garcia, R. L. Simpson, V. L. Behr, L. D. Whinery, and L. W. Peng. Optical Spectroscopic Monitoring of Parachute Yarn Aging. Office of Scientific and Technical Information (OSTI), April 1999. http://dx.doi.org/10.2172/6727.

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Mulkern, Thomas J., and Martin N. Raftenberg. Kevlar KM2 Yarn and Fabric Strength Under Quasi-Static Tension. Fort Belvoir, VA: Defense Technical Information Center, October 2002. http://dx.doi.org/10.21236/ada408883.

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Mehta, Parvez, Mitchell Driggers, and Carole Winterhalter. Development of Flame Resistant Combat Uniform Fabrics Made from Long Staple Wool and Aramid Blend Yarn. Fort Belvoir, VA: Defense Technical Information Center, April 2013. http://dx.doi.org/10.21236/ada578994.

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Kirkwood, John E., Keith M. Kirkwood, Young S. Lee, Ronald G. Egres, Wetzel Jr., and Eric D. Yarn Pull-Out as a Mechanism for Dissipation of Ballistic Impact Energy in Kevlar KM-2 Fabric, Part 2: Prediction of Ballistic Performance. Fort Belvoir, VA: Defense Technical Information Center, May 2004. http://dx.doi.org/10.21236/ada424323.

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Ilgenfritz, Pedro. Guide Me Without Touching My Hand: Reflections on the Dramaturgical Development of the Devised-theatre Show One by One. Unitec ePress, December 2016. http://dx.doi.org/10.34074/ocds.038.

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This essay is a reflection on some aspects of dramaturgy observed during the creation and development of One by One, a silent tragicomedy designed by the Auckland company, LAB Theatre, in 2011 and restaged in 2013. The emphasis of the essay is on pedagogical aspects at the core of the company’s work, as they inform the creative process and lead to the blending of the actor’s function into that of the dramaturg. The following discussion makes apparent the fact that this process of hybridisation, made possible by implementing features of devised theatre, emancipates the actor and brings improvisation to a better use. The play was based on the notion that theatrical action must be ‘suggestive’ rather than ‘descriptive.’ This idea originated in the works of Konstantin Stanislavski (1988) and Jacques Copeau (2000) and was developed by more recent theorists of dramaturgy into a practical framework for theatrical performance in general. The success of One by One depended very much on the implementation of these principles. The achievement was duly noted by reviewer Lexie Matheson (2011), who appreciated that One by One “exists on its own, doesn’t need explanation, doesn’t explain itself; it just unravels with delicacy and tenderness, like a good yarn should.
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Barlow, C. R., K. T. Ziehlke, and W. A. Pryor. Cylinder yard inspections and corrective actions. Office of Scientific and Technical Information (OSTI), July 1990. http://dx.doi.org/10.2172/10138092.

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Barlow, C. R., K. T. Ziehlke, and W. A. Pryor. Cylinder yard inspections and corrective actions. Office of Scientific and Technical Information (OSTI), July 1990. http://dx.doi.org/10.2172/5497149.

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Heintschel, Cliff Lynn. ta 60 heavy equipment yard swppp. Office of Scientific and Technical Information (OSTI), January 2016. http://dx.doi.org/10.2172/1235217.

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Dramm, John Rusty, Robert Govett, Ted Bilek, and Gerry L. Jackson. Log sort yard economics, planning, and feasibility. Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory, 2004. http://dx.doi.org/10.2737/fpl-gtr-146.

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