NOPR Collection:http://nopr.niscpr.res.in/handle/123456789/243222026-10-08T17:59:54Z2026-10-08T17:59:54ZTransport properties of ferroelectric (lead titanate) doped zinc - borate glassesUbale, S KAdgaonkar, C Shttp://nopr.niscpr.res.in/handle/123456789/243702013-12-01T16:43:56Z2001-08-01T00:00:00ZTitle: Transport properties of ferroelectric (lead titanate) doped zinc - borate glasses
Authors: Ubale, S K; Adgaonkar, C S
Abstract: Ferroelectric doped zinc-borate glasses of
the composition (1-x) [40 ZnO-60 B<sub>2</sub>O<sub>3</sub>] + x PbTiO<sub>3</sub>
with <i><img src='/image/spc_char/lembda.gif' border=0></i>= 0,0.05,0.1,0.15 ,0.2 were prepared. Physical properties such as
density (<i>d</i>), molar volume (<i>V</i>), hopping distance (<i>R</i>), number
of zinc ions per cc (<i>N</i>), and polaron radius (<i>r<sub>p</sub></i>)<i> </i>were
reported. DC-conductivity was measured between 443 K to 573 K. From this, two graphs
(a) -log σ versus 1/<i>T </i>and (b)- log μ versus 1/<i>T </i>were plotted. Activation
energy <i>W </i>was determined from the plots. Effect of ferroelectric doping
on the hopping conduction was studied. Polaron bandwidth (<i>J</i>)<i> </i>was
found to satisfy the inequality for all samples thus suggesting adiabatic
hopping conduction mainly governed by the activation energy.
Page(s): 215-2182001-08-01T00:00:00ZEffect of temperature and air feed rate on adiabatic gasification of Okaba sub-bituminous coal in NigeriaAdeyinka, J SojiAkinbode, F Ohttp://nopr.niscpr.res.in/handle/123456789/243672013-11-29T16:46:15Z2001-08-01T00:00:00ZTitle: Effect of temperature and air feed rate on adiabatic gasification of Okaba sub-bituminous coal in Nigeria
Authors: Adeyinka, J Soji; Akinbode, F O
Abstract: The present investigations deal with, gasification
of Okaba sub-bituminous coal (OSB) of Nigeria at varying temperatures and
air feed rates. Analysis of gaseous product showed that the best yield of CO (80%)
was recorded at 90% stoichiometric air feed, while the least CO yield (55%) was
recorded at 110% stoichiometric air demand. It was observed that CO yield followed
a pattern above 850 K thereby stabilising CO and increasing CO<sub>2</sub>
yield at air variation. This study will help in evaluating both thermal efficiency
and product distribution of OSB coal gasification.
Page(s): 239-2422001-08-01T00:00:00ZHydration of rice husk ash blended portland cementSingh, N BSingh, NeelamRai, SaritaSingh, Namwarhttp://nopr.niscpr.res.in/handle/123456789/243662013-12-02T16:43:38Z2001-08-01T00:00:00ZTitle: Hydration of rice husk ash blended portland cement
Authors: Singh, N B; Singh, Neelam; Rai, Sarita; Singh, Namwar
Abstract: Effect of different concentrations of lactic
acid on the hydration of rice husk ash blended portland cement has been studied
by employing different experimental techniques. Lactic acid has been found to
accelerate the hydration of blended cement.
Page(s): 235-2382001-08-01T00:00:00ZEffect of silica fume on the chloride and sulphate attack of sulphate resisting and high alumina cement compositeHelmy, I MEl-Didamony, HAli, A HEl-Sokkary, T Mhttp://nopr.niscpr.res.in/handle/123456789/243652013-11-30T16:43:58Z2001-08-01T00:00:00ZTitle: Effect of silica fume on the chloride and sulphate attack of sulphate resisting and high alumina cement composite
Authors: Helmy, I M; El-Didamony, H; Ali, A H; El-Sokkary, T M
Abstract: The present investigation aims to study the
chloride as well as sulphate attack on the composite of 85% SRC and 15% HAC. The
effect of substitution of HAC with silica fume on the aggressive attack was also
studied. The results indicate that the free lime contents decrease with silica fume
and curing time in sulphate as well as chloride solution. The XRD results are in
a good agreement with the compressive strength and chemical analysis. The substitution
of HAC with SF improves the attack of chloride and sulphate ions on cement pastes.
It can be concluded that superplastecizer must be added to the silica fume blended
cements.
Page(s): 228-2342001-08-01T00:00:00Z