http://nopr.niscair.res.in/handle/123456789/287 Search the Channel search http://nopr.niscair.res.in/simple-search http://nopr.niscair.res.in/handle/123456789/436 Title: Complex estimation of woven fabrics bending ability <br/> <br/>Authors: Mihailovic, Tatjana; Asanovic, Koviljka; Mihajlidi, Tatjana <br/> <br/>Abstract: The bending ability of cotton, wool and viscose woven fabrics under the action of their own weight has been examined using the direct indicators by cantilever method, and indirect indicators by disc method. The results obtained by the usage of direct and indirect indicators are found to be sensitive to raw material as well as constructional characteristics of woven fabrics. Values of direct as well as indirect indicators can be used for establishing the complex estimation of fabrics bending ability. It is found that the viscose fabric has the best bending ability and cotton (1) the poorest. <br/> <br/>Page(s): 453-458 Wed, 29 Aug 2007 22:58:59 GMT http://nopr.niscair.res.in/handle/123456789/435 Title: Air flow behaviour in commingling nozzles and their influence on properties of commingled yarns <br/> <br/>Authors: Alagirusamy, R; Ogale, Vinayak; Bhowmick, Manick <br/> <br/>Abstract: Two types of commingling nozzles have been used to study the air flow behaviour inside the nozzle and their effects on commingling performance of glass/nylon yarns. The air flow behaviour has been analysed with computational fluid dynamics software FLUENT 6.1 and actual air flow velocities are calculated using measured air pressure. It is observed that there is a good correlation between the simulation and the measured air flow pattern. The air flow pattern in the Nozzle-1 configuration shows more turbulent zones than that in Nozzle-2. The commingled yarn properties also clearly indicate that the effectiveness of commingling is much better with Nozzle-1 configuration than that with Nozzle-2 configuration. <br/> <br/>Page(s): 414-420 Wed, 28 Nov 2007 22:58:59 GMT http://nopr.niscair.res.in/handle/123456789/431 Title: Microwave absorption properties of carbon fibre containing nonwovens <br/> <br/>Authors: Zhu, Hua <br/> <br/>Abstract: A variety of nonwoven containing different weight percentages of pitch-based carbon fibre has been developed using through-air thermal bonding process or the spray bonding process and studied for its microwave absorbing capacity in the microwave frequency range 8 - 18GHz. Microwave reflectivity of the nonwoven is found closely related to the carbon fibre content. Electromagnetic parameters of the component fibres in the nonwoven have also been studied. Variation in microwave absorbing capacity of the nonwoven with the carbon fibre content is expounded according to the relationship between the electromagnetic parameters and the reflection coefficient of the nonwoven, as well as the relationship between the electromagnetic parameters and the attenuation constant of the nonwoven. The carbon fibre containing nonwoven has great potential in the military application as the radar camouflage material or in the non-defense application as the electromagnetic shielding material. <br/> <br/>Page(s): 391-398 Wed, 28 Nov 2007 22:58:59 GMT http://nopr.niscair.res.in/handle/123456789/423 Title: Theoretical evaluation of warp tension variations during weaving process <br/> <br/>Authors: Sheikhzadeh, M; Hosseini, S A; Darvishzadeh, M <br/> <br/>Abstract: The relationship between the ratio of the applied force on warp yarn by backrest roller to the warp tension, and the radius of backrest roller, the vertical position of backrest roller and the horizontal position of backrest roller with variations in warp beam radius during weaving process has been studied. The optimum values of the parameters have been calculated using a computer programme with the aim to minimize the variation in warp yarn tension during weaving process from full to empty warp beam. The results show that the increase in vertical distance between backrest roller and warp beam radius of backrest roller and horizontal distance between backrest and warp beam towards inner side causes lower variation in the ratio of force applied on warp sheet by backrest roller and warp tension during weaving <br/> <br/>Page(s): 377-380 Wed, 29 Aug 2007 22:58:59 GMT