http://nopr.niscair.res.in/handle/123456789/8203 Search the Channel search http://nopr.niscair.res.in/simple-search http://nopr.niscair.res.in/handle/123456789/8309 Title: Dielectric studies of H-bonded complexes of benzamide and nicotinamide with alcohols <br/> <br/>Authors: Sankar, U; Jeevaraj, A Kingson Solomon; Thenappan, T <br/> <br/>Abstract: The hydrogen-bonded complexes formed by benzamide and nicotinamide with alcohols in 1, 4-dioxan were studied at 303 K. The following alcohols were used: 2-butoxy ethanol, 2-ethyl hexanol, hexan-1-ol and isopropanol. The dipole moments of the complexes were determined using Huyskens method. The excess dipole moments of the complexes were obtained from bond angle data. The results show the domination of polarization effects and the non-feasibility of higher order complexations. <br/> <br/>Page(s): 339-334 http://nopr.niscair.res.in/handle/123456789/8308 Title: Microwave study of hydration of cement with different waters <br/> <br/>Authors: Barathan, S; Govindarajan, D; Sivakumar, G; Raghu, K <br/> <br/>Abstract: The dielectric constant and electrical conductivity of laboratory prepared cement paste, using X-band microwave technique in the frequency range 8.5-11.5 GHz have been studied. The cement was mixed with different waters, in a water to cement ratio (<i style="">w/c</i>) of 0.3, 0.4 and 0.5. With the help of dielectric constant and electrical conductivity, the hydration reactions of the cement pastes have been studied. <br/> <br/>Page(s): 334-338 http://nopr.niscair.res.in/handle/123456789/8307 Title: Achieving high signal-to-noise ratio in transient reflectivity measurements <br/> <br/>Authors: Vijayaragavan, A R; Chari, R; Oak, S M <br/> <br/>Abstract: Transient reflectivity measurements using ultrashort pulse pump-probe techniques can provide very useful information on fast carrier dynamics in semiconductors. Several non-trivial problems encountered in measuring reflectivity changes have been described. These changes can be very small (<img src='/image/spc_char/delta.gif' border=0><i>R</i>/<i>R</i> ~10^-3 or less) and hence measuring these small changes is not straightforward. The possible solutions in overcoming such problems have been described. Some preliminary results on a GaAs thin film have also been presented. <br/> <br/>Page(s): 330-333 http://nopr.niscair.res.in/handle/123456789/8306 Title: Synthesis, XRD and ⁵⁷Fe Mössbauer studies of the pseudo-binary Fe₁_-xMn_xSb₂ alloys<b style=""></b> <br/> <br/>Authors: Sharma, R K; Sharma, Y K <br/> <br/>Abstract: The synthesis of the polycrystalline Fe₁_-xMn_xSb₂ alloys for 0.0 ≤ <i style="">x </i>≤ 0.2 has been investigated. X-ray powder diffraction (XRD) patterns of three specimens revealed the formation of single phase orthorhombic crystal structure. Lattice parameters and unit cell volume increase with the increase in Mn concentration. ⁵⁷Fe Mössbauer spectra measured for all the three specimens at 300K were analyzed in terms of a single quadrupole split doublet revealing paramagnetic character at this temperature. <br/> <br/>Page(s): 325-329