Torque Detorque Zero-Twist Low Torque Yarns Reasonable design

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  • Torque, Detorque, Zero-Twist, Low Torque Yarns ...

    Torque, Detorque, Zero-Twist, Low Torque Yarns. Udo Schweizer’s Texturing Pages. The high amount of real twist that was thermoset in a false twisting process creates torque as the yarn is untwisted below the friction unit. Because of the “memory effect”, inherent to any thermoplastic material, the yarn wants to return to the twisted state.

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  • Education - PolySpinTex, Inc.

    Torque, Detorque, Zero-Twist, Low Torque Yarns Category : Texturing Pages Udo Schweizer’s Texturing Pages The high amount of real twist that was thermoset in a false twisting process creates torque...

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  • Texturing Pages - PolySpinTex, Inc.

    Tangling, entangling, intermingling stands all for one and... Air Texturing and Fabrics. Category : Texturing Pages. Udo Schweizer’s Texturing Pages The air texturing process was developed about 50 years ago. However, it took nearly 30 years... Torque, Detorque, Zero-Twist, Low Torque Yarns. Category : Texturing Pages.

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  • Production, properties and structures of short staple low ...

    As a low twist level (25-40% lower than for normal ring spun yarns) is adopted in the low torque yarn spinning, [1][2][3] [4] in the present investigation, samples of low torque yarns with a twist ...

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  • (PDF) Direct Objective Measurement of Yarn-torque Level

    In this paper, a direct and objective method for the measurement of yarn torque, using yarns wound into a bank, is described. Torque levels in some false-twist-textured nylon hosiery yarns are ...

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  • Self-Twist Spinning - an overview

    1.10.2 Self-twist spun yarns. In self-twist spun yarns, two fibrous strands are separately false twisted by alternating an S and Z twist along their length. They are then plied together by an untwisting torque of single to alternating Z and S twists to create a two-fold yarn. These yarns are spun in the medium to coarse count range (20–100 tex).

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  • Characterisation of torsional actuation in highly twisted ...

    1. Introduction. Giant torsional actuation from highly twisted fibres and yarns has been recently discovered , , , , , , with potential applications in microfluidic mixing and digital displays .Volume expansion induced thermally, chemically, photonically or electrochemically causes partial untwisting of highly twisted carbon nanotube, graphene or oriented polymer fibres and yarns , .

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  • Research on Sirospun yarn torque using airflow false ...

    Design/methodology/approach In the paper, the properties of the yakwool fiber were tested first, especially the melanin granules in the fiber. ... a low yarn twist results in low average fiber ...

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  • Mathematical Modeling of Yarn Dynamics in a Generalized ...

    The twist efficiency of the moving surface shows a mild descending trend from 10.66% to 9.25% when the yarn twist doubles, while the trapping and congestion coefficients maintain around 0.9 for ...

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  • Twist buckling and the foldable cylinder: An exercise in ...

    Ichiro Hagiwara. In this paper, a novel vibration isolator based on a foldable cylinder with a torsional buckling pattern, which is also called Kresling's pattern, is proposed, and the performance ...

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  • Mechanics of Latent Crimp in False Twist Textured Yarn

    ments and zero twist. The yarn was textured on a Barmag spindle false-twisting machine at a heater temperature of 230'C, heater contact period of 0.55 see, twist level of 80 tpi and underfeed in the texturing zone of 3 %. No second heater was used. The as-textured yarn had very low crimp retraction, viz. in the region of 5%. The crimp was ...

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  • Mathematical Modeling of Yarn Dynamics in a Generalized ...

    The twist efficiency of the moving surface shows a mild descending trend from 10.66% to 9.25% when the yarn twist doubles, while the trapping and congestion coefficients maintain around 0.9 for ...

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  • Self-Twist Spinning - an overview

    1.10.2 Self-twist spun yarns. In self-twist spun yarns, two fibrous strands are separately false twisted by alternating an S and Z twist along their length. They are then plied together by an untwisting torque of single to alternating Z and S twists to create a two-fold yarn. These yarns are spun in the medium to coarse count range (20–100 tex).

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  • Characterisation of torsional actuation in highly twisted ...

    1. Introduction. Giant torsional actuation from highly twisted fibres and yarns has been recently discovered , , , , , , with potential applications in microfluidic mixing and digital displays .Volume expansion induced thermally, chemically, photonically or electrochemically causes partial untwisting of highly twisted carbon nanotube, graphene or oriented polymer fibres and yarns , .

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  • Dynamic Loads - an overview

    This low tension has a tendency to reduce yarn strength because of the low fibre migration and torque required to twist the fibres. In principle, rotor spun yarns need more fibres per cross-section than comparable ring-spun yarns due to the insufficient torque at the point of yarn formation.

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  • Theoretical Analysis of the Twist Structure of Friction Yarns

    cifically, the resultant overall twist is zero, theoretically. Keywor ds: fiber arrangement, torque, twist distributi on, friction zone, take-up zone, resultant twists 222 임정호 · 김종성 ...

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  • Modelling and simulation of fibrous yarn materials ...

    An idealised model of twisted yarn geometry is shown in Fig. 5.1(a).It consists of concentric helices with constant twist period h and has yarn lengths in one turn of twist, l and L, at an intermediate radius r and the external radius R.By opening out the cylinders into flat rectangles, as shown in Fig. 5.1(b) and (c), the relations between helix angles θ and α and the other quantities can ...

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  • Staple Length - an overview

    As the strands untwist, the length of the zero twist zone increases. The strength of the zero twist zone varies with staple length in the manner shown in Fig. 10.11(c). It will be seen that it is necessary to use a staple length of several inches (unless the weak points are strengthened by some means) to get a reasonable strength.

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  • A Bio-mechanical Model for Elbow Isokinetic and Isotonic ...

    A new bio-mechanical model for elbow flexions is proposed to quantify the elbow torque generated as a function of the upper-arm circumferential strain and influencing factors of elbow angle and ...

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  • Semi-analytical Model for Superelastic Behavior of Twisted ...

    Manufacturing improvements have enabled the integration of shape memory alloys (SMA) into novel form factors to offer tailored solutions to engineering applications. Of these form factors, multifunctional twisted SMA microfilament yarns …

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  • Forward and inverse problems in the mechanics of soft ...

    1. Introduction. Quasi one-dimensional objects …

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  • Self-twist spinning - ScienceDirect

    Due to the zero-twist zones at every twist changeover, ST yarns contain points of weakness along the length. In the case of an in-phase yarn (see Fig. 14.25(a)), if the length of zero-twist zones is equal to or greater than the length of bridging fibres, then the force required to break the yarn is low. This confirms the importance of fibre ...

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  • Deployable‐Structure‐Based Artificial Muscles Generating ...

    Guest-filled carbon nanotube yarns based on a sheathed twisted or coiled core were proposed for the design of inexpensive high-performance artificial muscles. SMA-based actuators with a twisted yarn of NiTi alloy fibers were proposed for the generation of fast torsional actuation [ 3 ] and highly twisted fibers were proposed for the ...

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  • On the dynamics and control of mechanical properties of ...

    The design of multifunctional materials entails a clear understanding of their underlying physics. Mechanical metamaterials which exhibit a negative Poisson’s ratios (auxetics) 1,2,3,4,5,6,7,8,9 ...

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  • Exporters of Yarn from Surat, Gujarat by Kayavlon Impex ...

    In this type, the Spandex Yarn is first covered with Polyester or Nylon DTY in a spiral wave with S twist & then on top of it, the yarn is again covered with Polyester or Nylon DTY in a spiral wave with Z twist. One is outer covering, and the other is inner covering. So the Spandex is double covered with yarn and final yarn has zero torque.

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  • Inelastic Behavior in Repeated Shearing of Bovine White Matter

    This is reasonable in light of observations that brain tissue stiffens with straining (Miller, 2002), meaning that the regions of highest strain could be expected to dominate the secant modulus. Second, the variations in specimen dimensions were negligible when comparing torque-vs.-peak strain plots from different specimens.

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  • Mathematical Modeling of Yarn Dynamics in a Generalized ...

    Twisting efficiency, twist trapping and twist congestion in a generalized twisting system. As shown in Fig. 2, the twisting system is composed of delivery rollers at point A, a translationally moving rigid cylinder, which contacts with the yarn in zone BC and a twister at point D.Hence, there are two twisters in the system: one is the real-twister at point D; another is the false-twister which ...

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  • (PDF) Process control and yarn quality in spinning ...

    Academia.edu is a platform for academics to share research papers.

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  • R&D Archivi - Page 3 of 4 - Electric Motor Engineering

    6. reasonable cost. Since the EV operates over a wide torque-speed range in various driving conditions, the motor design should be aimed to achieve overall energy saving over a driving-cycle of the vehicle (e.g. WLTP, NEDC, UDDS). There are many demands for developing propulsion systems with high power density, high efficiency and low cost.

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  • Weaving With Unsized Yarn

    most desirable attributes* for size-less weaving (* viz., low hairiness, high abrasion resistance, and excellent uniformity and consistency of other characteristics) Development of a method to set (stabilize) twist. torque/liveliness of the yarn and prepare a loom beam for weaving without the traditional sizing.

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  • DEVELOPMENT 'OF COTTON AND NYLON, KNITTED CLOTH ELASTIC ...

    twist, and onto a takeup package. If, as in this case, a torque-free yarn is de-sired, yarn from two banks of spindles or from two separate machines are combined, S and Z together, to form a 2-ply yarn with zero torque. The selection of the ARCT was intended to present the highest degree of uniformity

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  • Carbon nanotube and graphene fiber artificial muscles ...

    Carbon nanotube and graphene fiber artificial muscles J. Foroughi and G. Spinks, Nanoscale Adv., 2019, 1, 4592 DOI: 10.1039/C9NA00038K This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

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  • Optimising fibre alignment in twisted The Author(s) 2013 ...

    model of twisted yarns is the coaxial helix structure proposed by Ge´gauff in 1907,5 which is shown in Figure 1(a). The model has been widely adopted with only minor modifications in modern yarn structural mechanics analysis.6 In conventional staple fibre yarns, twist has a pro-found influence on the yarn strength. At low twist

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  • Forward and inverse problems in the mechanics of soft ...

    1. Introduction. Quasi one-dimensional objects …

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  • An improved torsion pendulum based on image processing for ...

    An improved torsion pendulum technique based on image processing is developed, which allows the measurement of the torsional oscillation of individual fibers. The torsion pendulum is composed of a length of fiber specimen and a ring-shaped mass attached to one of its ends. The oscillation motion of the mass is recorded with a video camera overhead.

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  • (PDF) Pump-Handbook.pdf

    Academia.edu is a platform for academics to share …

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  • Weaving With Unsized Yarn

    most desirable attributes* for size-less weaving (* viz., low hairiness, high abrasion resistance, and excellent uniformity and consistency of other characteristics) Development of a method to set (stabilize) twist. torque/liveliness of the yarn and prepare a loom beam for weaving without the traditional sizing.

    Get Price
  • Semi-analytical Model for Superelastic Behavior of Twisted ...

    Manufacturing improvements have enabled the integration of shape memory alloys (SMA) into novel form factors to offer tailored solutions to engineering applications. Of these form factors, multifunctional twisted SMA microfilament yarns …

    Get Price
  • Tensile Properties of Dyneema SK76 Single Fibers at ...

    Previous low rate studies on UHMWPE single fibers bonded directly to cardboard using epoxies show low success rates as low as 10 % on 27.5 µm diameter fibers. Prior to the present study using direct gripping, our attempts to study Dyneema …

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  • Filament yarn and process to prepare same - Hoechst ...

    The present invention concerns a process for preparing essentially smooth filament yarns having several loose filament ends stick out, wherein at least a portion of the used filaments has a flex abrasion resistance of below abt. 1 500 revol. and wherein a filament bonding is imparted in known manner to the filament yarns subject to this treatment and wherein same are then submitted to a ...

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  • Carbon nanotube and graphene fiber artificial muscles

    using carbon nanotube (CNT) yarns and/or graphene (G) fibers as novel artificial muscles that have the ability to be driven by the electrochemical charging of helically wound multiwall carbon nanotubes or graphene fibers as well as elements in the ambient environment such as moisture to generate such rotational action.

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  • Information Bulletin from van Wees

    the yarns push onto the tension sensor is constant. The yarns pass only non-rotating parts, making sure there is no risk of fiber wrap. The brake torque on the spool is generated with a spring loaded brake belt, as mentioned earlier. Each spool holder belt is equipped with a linear actuator which increases or releases the spring tension.

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  • Stretchable artificial muscles from coiled polymer fibers ...

    Reference Yip and Niemeyer 15 As introduced by Baughman and co-workers, coiled polymer fiber artificial muscles are made by a simple twist insertion process using low …

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  • Stretchable artificial muscles from coiled polymer fibers ...

    The recently described spring-like polymer coil artificial muscles14 are highly stretchable and compliant and are of particular interest for use in robotic garments and soft robotic devices.15 As introduced by Baughman and co-workers, coiled polymer fiber artificial muscles are made by a simple twist insertion process using low-cost polymer textile fibers.

    Get Price
  • Comparative study of robotic artificial actuators and ...

    Tensile CNT actuators could be constructed by twisted spun yarns or coiled yarns, and the output strains could be improved. 130,175 However, torsional CNT actuators could be formed by twist spun yarns, with two ends tethered. 176,177 Typically, the stress output of single-walled CNTs (SWNTs) is approximately 0.75 MPa, and the maximum observed ...

    Get Price
  • Liquid crystals in micron-scale droplets, shells and ...

    3.2. How to make liquid crystal shells and droplets using microfluidics. A typical way of producing LC droplets is preparing emulsions by dispersing liquid crystals in an immiscible liquid. Among numerous methods for the emulsion preparation, stirring or vortexing constitute quick and low-cost approaches.

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  • TEXTILE INSTRUMENTS – Vijaytrade Syndicate

    The TM-5000/5010 series is a hand-held Non-Contact/Contact Tachometer. It measures rotational and linear speeds of upto 99,999.9 rpm and measured value can be converted instantly to different units of measurements (RPM, RPS, m/min, cm/s, inch/s, ft/min and yd/min).

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  • Composite flexible blanket insulation - The United States ...

    A thread twist between 28 and 122 TPM thus is optimal for strength, but the twist of 28 TPM can be eliminated because the low twist results in a loose, irregular thread with tow-like behavior that is unsuitable for sewing. FIG. 15 shows the influence of temperature on SiC threads prepared at the six twist levels.

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  • building on wheels ?The Secret Plans

    Using a low, wide shrub next to a tall, narrow tree will accentuate the features of each plant. ... you don''t crazy fast and torque is as great as with some servo motors used in industrial CNC machines. But there is still a fast spinning spindle and danger of crushing your fingers. ... you end up with a gap between the material and the zero ...

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  • Liquid crystals in micron-scale droplets, shells and ...

    3.2. How to make liquid crystal shells and droplets using microfluidics. A typical way of producing LC droplets is preparing emulsions by dispersing liquid crystals in an immiscible liquid. Among numerous methods for the emulsion preparation, stirring or vortexing constitute quick and low-cost approaches.

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  • Peer Reviewed Journal - IJERA

    Design of Aware Flip-Flop with Low Power Variations by P-Spice Abstract: Excessive power dissipation causes overheating, which can lead multiple impacts like, packaging cost, reliability & functionality of IC and other soft errors.

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  • The challenge of changing from empirical craft to ...

    FRM followed the modelling of twisted continuous filament yarns, which had given good predictions for large-strain, non-linear, load-extension properties, but was extended in several ways. First, it was necessary to consider the multiple twist levels in rope structures. Secondly, the modelling covered the tension-torque-length-twist relations.

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  • pcbn inserts in solid cbn and tipped cbn for hard turning ...

    PCBN inserts for turning cast iron and hardened steel: pcbn is the second hardest material in the world, and cbn related high precision cutting tools are introduced to industry, achieved high productivity and cost reductions. pcbn is the short name of polycrystalline cubic boron nitride, and pcbn inserts are mainly for the hard metal turning to replace the conventional machining way of grinding.

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  • Proceedings

    The material offers several advantages such as the design of low-weight, slender structures. However, one of the main drawbacks of this composite material is the time consuming manufacturing process using two dimensional fibre textiles.

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  • Seminar Archive 2011 - 2015

    At zero-thrust conditions, convected turbulent structures pass through the disk plane with little distortion and noise can be predicted with reasonable accuracy knowing the inflow turbulence correlation function. When thrusting, the approach flow turbulence distorts as it is accelerated and, at high thrust, is stretched into long, thin filaments.

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  • Handbook of Weaving - SILO.PUB

    The ring spun yarns are characterized by high level and relatively uniform twist. In open end spun yarns, there is a distinct core of fibers with relatively low twist; other fibers are wrapped around the core. The structure of air-jet yarns is in between the open end and ring spun yarns.

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  • building on wheels ?The Secret Plans

    371,257|A lot of people may say that it''t help a lot, of course, there''s better to print them with PETG cost of PETG is almost the same and both of them are easy to print but PETG is a little bit more flexible so it''t have to print parts labeled as OLD, those are old versions of some files that I shared in case someone wants to use them.|Be careful while post-processing those parts, it''s ...

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  • gardenchairswooden ?Cherry Tree Toys

    |Junk removal costs 236 on average with a typical range between 134 and 360.A full truckload runs 400 to 800.The minimum for a single item costs between 60 and 150.Each additional item runs 20 to 40 each. Removing construction debris, gravel or dirt runs 100 to 600 per truckload.Dumpster rentals range from 300 to 600 per week.|It’ll cost anywhere from 60 to 800 to haul away junk.

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  • COMPARISON OF FATIGUE DATA FOR POLYESTER AND WIRE ROPES ...

    Low-twist fibre ropes, which are used for deepwater moorings in order to optimise tensile strength, need tough braided or plastic jackets in order to avoid sensitivity to external abrasion. However, provided unduly careless handling is avoided, external damage should not be a problem. In a properly designed mooring, tensile overload should not ...

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  • Carbon nanotube and graphene fiber artificial muscles

    using carbon nanotube (CNT) yarns and/or graphene (G) fibers as novel artificial muscles that have the ability to be driven by the electrochemical charging of helically wound multiwall carbon nanotubes or graphene fibers as well as elements in the ambient environment such as moisture to generate such rotational action.

    Get Price
  • Models for shear properties/behavior of dry fibrous ...

    During forming operations of dry fibrous materials in order to get the composite preforms, the deformation mode is substantially determined by the occurring shear strains. Consideration of the material shear response namely from the theoretical point of view has gained high importance because multi-scale nature and anisotropy of fibrous materials complicates their experimental investigation ...

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  • Comparative study of robotic artificial actuators and ...

    Tensile CNT actuators could be constructed by twisted spun yarns or coiled yarns, and the output strains could be improved. 130,175 However, torsional CNT actuators could be formed by twist spun yarns, with two ends tethered. 176,177 Typically, the stress output of single-walled CNTs (SWNTs) is approximately 0.75 MPa, and the maximum observed ...

    Get Price
  • New Fishing Tackle for 2022

    It's ICAST time again. We've spent the last two months …

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  • A Bio-mechanical Model for Elbow Isokinetic and Isotonic ...

    Hypothesis and modeling. As shown in Fig. 1(a), the elbow joint is treated as a bio-mechanical system comprising two antagonistic muscles, biceps brachii (dominant elbow flexor) and triceps brachii (dominant elbow extensor), as well as two skeleton bones, humerus and ulna.The elbow angle θ is the angle between humerus and short end of ulna, ˙ θ θ ˙ denotes the angular velocity of flexion ...

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  • The challenge of changing from empirical craft to ...

    FRM followed the modelling of twisted continuous filament yarns, which had given good predictions for large-strain, non-linear, load-extension properties, but was extended in several ways. First, it was necessary to consider the multiple twist levels in rope structures. Secondly, the modelling covered the tension-torque-length-twist relations.

    Get Price
  • Materials Research Express, Volume 6, Number 2, February ...

    Low-cost microwave assisted technique has been applied to produce La-doped CdS nanoparticles and their structural, morphological, optical, Raman, dielectric and electrical studies were carried out. Broad XRD peaks revealed the growth of low-dimension La-doped CdS nanoparticles with wurtzite structure.

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  • Handbook of Weaving - SILO.PUB

    The ring spun yarns are characterized by high level and relatively uniform twist. In open end spun yarns, there is a distinct core of fibers with relatively low twist; other fibers are wrapped around the core. The structure of air-jet yarns is in between the open end and ring spun yarns.

    Get Price
  • Liquid crystals in micron-scale droplets, shells and ...

    3.2. How to make liquid crystal shells and droplets using microfluidics. A typical way of producing LC droplets is preparing emulsions by dispersing liquid crystals in an immiscible liquid. Among numerous methods for the emulsion preparation, stirring or vortexing constitute quick and low-cost approaches.

    Get Price
  • Stretchable artificial muscles from coiled polymer fibers ...

    The recently described spring-like polymer coil artificial muscles14 are highly stretchable and compliant and are of particular interest for use in robotic garments and soft robotic devices.15 As introduced by Baughman and co-workers, coiled polymer fiber artificial muscles are made by a simple twist insertion process using low-cost polymer textile fibers.

    Get Price
  • The challenge of changing from empirical craft to ...

    FRM followed the modelling of twisted continuous filament yarns, which had given good predictions for large-strain, non-linear, load-extension properties, but was extended in several ways. First, it was necessary to consider the multiple twist levels in rope structures. Secondly, the modelling covered the tension-torque-length-twist relations.

    Get Price
  • The Project Gutenberg eBook of The Woman And The Car, by ...

    Torque. —The twisting effort of rotation. Universal Joint. —A flexible joint which permits the transmission of power from one shaft to another in any direction. Volt. —The unit of measure of electrical pressure. It is the measure of the quality of the flow as compared with ampere which is the measure of quantity.

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  • The Number of the Beast (full text) by Robert Heinlein

    This is the full text of a very long full length novel by Robert Heinlein. It is about a 'mad scientist' that builds a machine that can enter and leave different world-lines at will. The scientist meets up with a girl and they both go out exploring all the very many different world lines at their leasure. As they fiddle with the controls they start to enter some very strange world-lines.

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  • On the mechanics of twist insertion (book 1965)

    The embedding of the twist triangle was intended to illustrate and observe the twisted form of a 6-component yarn, the formation of the slack and the effect of migration on the horizontal location of the twist …

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  • Stretchable artificial muscles from coiled polymer fibers ...

    The recently described spring-like polymer coil artificial …

    Get Price
  • bardreclaimedplans ?WoodStore.Net

    The tables are available in both a 35-inch diameter option and a 55-inch one. They come with a strong base, a low profile design, and a large open shelf below for magazines and other stuff.|The low round stone top coffee table is a captivating combination of a solid base with walnut wood and attractive design.

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