http://nopr.niscair.res.in/handle/123456789/5446 Search the Channel search http://nopr.niscair.res.in/simple-search http://nopr.niscair.res.in/handle/123456789/5470 Title: Economical and thermal optimization of possible options to control visible plume from wet cooling towers <br/> <br/>Authors: Tyagi, S K; Park, S R; Tyagi, V V; Anand, S <br/> <br/>Abstract: Economic study has been done for the heat pumps, biogas and solar collectors along with the phase change materials (PCM) storage and the results have been compared for various costs. The different combinations and options for the heating and cooling requirements, the heating capacities and the comparisons of different costs are studied in detail. It has been found that all the costs are much lesser for a solar collector system followed by the biogas plant and the heat pump systems. On the other hand, all the costs are found to be the highest in the case of an air cooled geothermal heat pump system, while it is reverse in case of the water cooled solar collector system. <br/> <br/>Page(s): 597-608 http://nopr.niscair.res.in/handle/123456789/5469 Title: Temperature dependent study of volume and thermal expansivity of solids based on equation of state <br/> <br/>Authors: Kapoor, Kamal; Dass, Narsingh <br/> <br/>Abstract: Five different approaches have been used to obtain simple relations to study the temperature dependent volume and thermal expansivity of the solids. All the relations are found to be identical. The computation has been done on six geological solids and three metals with the help of these relations. All the relations are quite successful in representing the volume and the thermal expansivity as a function of temperature. However, the relation obtained with the help of Tait EOS (Equation of State) is found to be better.    <br/> <br/>Page(s): 592-596 http://nopr.niscair.res.in/handle/123456789/5468 Title: Effect of grinding on the crystal structure of recently excavated dolomite <br/> <br/>Authors: Ramasamy, V; Ponnusamy, V; Sabari, S; Anishia, S R; Gomathi, S S <br/> <br/>Abstract: Transmission FTIR technique was used to identify the minerals in recently excavated dolomites and study the structural changes of dolomite upon grinding at various grinding periods. KBr pressed disk technique was found to be very useful for a routine characterization of minerals, for examination of structural modification of dolomite and formation of new minerals during grinding. These minerals and processes were also determined using XRD and SEM analysis. The minerals which were formed upon grinding dolomite, were aragonite, anorthite, metakaolinite and periclase. <br/> <br/>Page(s): 586-591 http://nopr.niscair.res.in/handle/123456789/5467 Title: Analysis of sound ray theory and FEM for ultrasonic propagation in a finite rod <br/> <br/>Authors: Chen, Youxing; Wang, Zhaoba; Zheng, Jianli; Zhao, Xia; Li, Yuan <br/> <br/>Abstract: The presence of echo presented with ultrasonic propagation in a finite metal rod, the sound ray theory is used to analyse the wave mode conversion of ultrasonic propagation in a finite rod and the impact on echo by it, and the conclusion is drawn that the intervals of the echoes are decided by the rod’s diameter and wave velocity. The process of ultrasonic propagation through a rod and the final ultrasonic echoes are analyzed by the FEM. In the practical application, based on the results of the FEM simulation for ultrasonic propagation in rods and the selectivity of the material and dimension, the characteristic echo and following echoes are identified at time domain, aiming to extract characteristic echo from the ultrasonic signal. <br/> <br/>Page(s): 572-575