By Polona Dobnik-Dubrovski
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This publication goals at giving a normal account of the foundations of valency and molecular constitlltion, based on tI1e Rutherforcl-Bohr atom. In dev'eloping the idea of valency there are classes open to the chemist. He may perhaps use symbols ,with no convinced actual connotation to precise the reacti,rity of the atoms in a molecule, and will depart it to the subseqtlent development of technology to find what realities those symbols characterize: or he might undertake the recommendations of atomic physics-electrons, nuclei, and orbits-and attempt to clarify the chemical proof when it comes to those.
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Additional info for Wowen fabric and ultraviolet protection
During the making-up of a garment, the shear deformation is also indispensable for an intended garment shape. Shear rigidity G provides a measure of the resistance to the rotational movement of the warp and weft threads within a fabric when subjected to low levels of shear deformation. The lower the value of G, the more readily the fabric will conform to three-dimensional curvatures. If the shear rigidity is not enough, a fabric distortion will easily occur. So does the skewing or bowing during handling, laying up, and sewing.
Conference STRUTEX, TU of Liberec, pp. 89-92, ISBN 80-7083-891-4 Zheng, J. et all (2008). Measuring technology of the Anisotropy Tensile Properties of Woven Fabrics. Textile Res. , 78, (12), pp. , Amar, S. B. & Dogui, A. (2008). Experimental and numerical analyses of fabric off-axes tensile test. JOTI, Vol. 99, iFirst 2008, 1–11 European standard EN ISO 13934-1. Determination of maximum force and elongation at maximum force using the strip method CSN standard 80 0810 Zistovanie trznej sily a taznosti pletenin (Recognition of breaking stress and strain of knitted fabrics) 2 Mechanical Properties of Fabrics from Cotton and Biodegradable Yarns Bamboo, SPF, PLA in Weft Živa Zupin and Krste Dimitrovski University of Ljubljana, Faculty of Natural Sciences and Engineering, Department of Textiles Slovenia 1.
16. Example of calculated and measured fabric stress at break. 4. Measuring of rupture properties Experiments always mean some scale of unification and simplification in comparison with fabric real loading at the use. To simulate real practical situations is not possible – it would result in too many different experimental methods. ). Nevertheless uniaxial and biaxial stresses are the most important forms of load for investigation of textile fabrics rupture properties. ) seldom result in fabric break.