NOPR Collection:

Liquid transport into polymeric blend of ethylene-propylene random copolymer and isotactic polypropylene in the temperature interval of 25- 70°C

2016-07-20T05:17:51Z

Title: Liquid transport into polymeric blend of ethylene-propylene random copolymer and isotactic polypropylene in the temperature interval of 25- 70°C Authors: Aminabhavi, Tejraj M; Phayde, Hemant T S Abstract: Sorption, desorption and diffusion coefficients have been obtained for benzene, toluene, ethyl benzene, p-xylene, chlorobenzene, bromobenzene, 1,2-dichlorobenzene and mesitylene into thermoplastic blend of ethylene-propylene random copolymer and isotactic polypropylene in the temperature range of 25-70°C. Diffusion coefficients have been correlated with liquid viscosity and follow the expected trend of decrease in diffusivity with increase in liquid viscosity. The concentration dependency of diffusion coefficients has also been studied. Page(s): 184-190

Effect of superimposed square wave alternating current during electro crystallization of copper on copper single crystal planes

2016-07-20T05:16:28Z

Title: Effect of superimposed square wave alternating current during electro crystallization of copper on copper single crystal planes Authors: Shyamsunder, K; Sheshadri, B S Abstract: The morphology of copper electrodeposits on copper single crystal planes is affected by superimposing a square wave alternating current (ac) on a direct current (dc). The effects of 'ac' are discussed from the morphological point of view and from the cathodic polarization studies. In the presence of superimposed 'ac' on the (111) plane, hexagonal and triangular pyramids observed in purified acid copper sulphate bath truncate and change to layers, then to a truncated triangular block and finally to polycrystalline type of deposit. Layer type of deposit observed on (100) plane transforms to truncated square pyramidal blocks and finally to polycrystalline deposit. On the (110) plane, ridges break up and give rise to a polycrystalline deposit. It was found that a superimposed 'ac' has a depolarizing effect. The mechanism of the deposition process is discussed. Page(s): 177-183

Electron microscopy of oxide films on Zircaloy-2

2016-07-20T05:15:36Z

Title: Electron microscopy of oxide films on Zircaloy-2 Authors: Phadnis, S V; Asundi, M K Abstract: Initial oxide films formed on ZircaIoy-2 in steam at 750^oC for periods of 10 and 20 s have been studied using transmission electron microscopy. The initial. Oxide film is seen to be amorphous but rapidly starts crystallizing during examination. The crystallization product is a mixture of tetragonal and monoclinic oxides. The film obtained at 750^oC after 20 s of oxidation is fully crystalline and is in the cubic phase of oxide. Delineation of substrate grains in this case is clearly seen. The formation of metastable phases of the oxide has been explained. The orientation relationship between the metal and the oxide has been determined. Page(s): 172-176

Reduction of nitrogen oxide emissions using nickel-copper alloy catalyst in diesel engines

2016-07-20T05:14:45Z

Title: Reduction of nitrogen oxide emissions using nickel-copper alloy catalyst in diesel engines Authors: Nedunchezhian, N; Balagurunathan, K; Rao, P Srinivasa; Ganesan, V Abstract: Results of experiments conducted for the reduction of NO_xin diesel engine exhaust using nickel copper alloy, marketed under the name Monel, are reported. At temperatures above 600 K, and space velocities up to 40000 h^-1, Monel is found to reduce about 70% of NO_xin diesel engine exhaust. Monel in wire form, have been used for minimized swelling effect and thereby increasing its life, as the catalyst life is limited by physical deteriorations of catalyst, which causes increase in exhaust back pressure. Study on warm up characteristics of the catalyst system show rapid bed warm-up and possible reduction in catalyst mass without affecting the NO_x reduction performance. Page(s): 167-171