Twist, balanced

To use the range of fibers for tire applications, the yarns must be twisted and processed into cords. First, yarn is twisted on itself to give a defined number of turns per inch (i.e., ply twisting). Two or more spools of twisted yam are then twisted into a cord. Generally the direction of twist is opposite that of the yarn this is termed a balanced twist. There are a number of reasons for twist in a tire cord ... 

Balanced twists n. In a plied yarn or cord, an arrangement of twist, which will not cause the yarn or cord to twist on itself of kink when held in an open loop. 

However, there may not be an appreciable improvement in the proximity effect between each section, unless the transpositions are increased infinitely, as in the case of a stranded three-phase cable which has continuously twisted conductors and represents an ideal transposition. In addition, there is no change in the skin effect. This arrangement therefore has the purpose primarily of achieving an inductively balanced system and hence a balanced sharing of load and equal phase voltages at the far end. 

Dreh-. rotatory, rotary, rotating, rotational, revolving, turning, torsional, -achse, /, axis of rotation (or of revolution) knife edge (of a balance) pin, -bank, /, lathe, drehbar, a. capable of being turned or twisted. 

Torsions-faden, m. torsion filament or wire, -festigkeit, /, torsional strength, -kraft, /, torsional force, -spaonung, /, torsional stress, twisting stress, -wa(a)ge,/. torsion balance, winkeh m. angle of torsion. 

Bosch LI, Mahon MF, James TD (2004) The B-N bond controls the balance between locally excited (LE) and twisted internal charge transfer (TICT) states observed for aniline based fluorescent saccharide sensors. Tetrahedron Lett 45(13) 2859-2862... 

Most helicates have linear axes, though a few helicates with circular axes are known - indeed the chiral (D4) molecular squares formed from Zn2+ and 2,5 -bis(2,2 -bipyridin- 6 -yl)pyrazine, 22, may be regarded as circular helicates (450). The formation of circular or linear forms seems to depend on balances between kinetic and thermodynamic control iron(II)-poly-2,2/-diimine systems with their substitutionally-inert metal centers provide useful systems for disentangling thermodynamic and kinetic contributions. The mechanism of formation of circular helicates of this type is believed to entail a kinetically favored triple helicate intermediate (484). Self-assembly of chiral-twisted iron(III)-porphyrin dimers into extended polynuclear species takes place through the intermediacy... 

ISO 3342 1995 Textile glass - Mats - Determination of tensile breaking force ISO 3343 1984 Textile glass - Yarns - Determination of twist balance index ISO 3374 2000 Reinforcement products - Mats and fabrics - Determination of mass per unit area... 

The energetics and dynamics of the triplet surface remain subject to controversy. Saltiel et al. (21) have recently proposed that triplet energy transfer to either t-1 or c-1 yields a common twisted triplet 3p which is more stable than 3t by 2.1 kcal/mole and thus predominates at equilibrium. Other workers have favored a more balanced 3p 3p equilibrium (22,... 

Free pendulums come in two main categories, those where the specimen itself supports an inertia arm and those where the end load is balanced so that there is no tensile stress in the specimen, these are known as inverted torsion pendulums. In either case the sensing of twist is done usually either by an optical system or by an electrical one. 

The photoisomerization of several copolymers was studied, in order to determine the effects of the structure and switching of the chiral side chain on the helicity of the main chain. A delicate balance of parameters was found, including separation and nature of the stereocenters, solvent, and concentration of azobenzene moieties J77 Stereoselectivity was often greatly enhanced if the chiral moieties were closer to each other. Accordingly, it was found that the incorporation of the stereocenter into a short, two-carbon spacer resulted in much more pronounced helical preference, as well as CD effects at lower chiral chromophore concentrations. The greater helical twist and improved thermal stability of the cis form (half-life 40h at RT) are notable features. 771 It was also found that the relationship between the trans-cis... 

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