NOPR Collection:

Synthesis and characterisation of microcrystalline cellulose powder

1997-02-01T00:00:00Z

Title: Synthesis and characterisation of microcrystalline cellulose powder Authors: Jeevananda, T; Siddaramaiah Abstract: The influence of the reaction parameters like concentration of hydrolyzing agent (hydrochloric acid), duration of hydrolysis, and temperature of reaction on the bulk density and particle size of the microcrystalline cellulose powder (MCCP) has been investigated. Linear variation of bulk density of MCCP with respect to hydrochloric acid concentration, duration of hydrolysis and temperature have been observed. The highest bulk density of 0.3918 has been obtained for 4 N HCl, 2 h reaction and 60 ± 2°C temperature. The bulk density values lie in the range of 0.1265-0.3918 g/cm³. Page(s): 38-40

Transport properties of amorphous CuO-Bi₂O₃ semiconducting pellets

1997-02-01T00:00:00Z

Title: Transport properties of amorphous CuO-Bi₂O₃ semiconducting pellets Authors: Gawande, W J; Pakade, S V; Yawale, S P; Burghate, D K; Motke, S G Abstract: The results of measurement of de-electrical conductivity and activation energy have been reported for four different composition of CuO-Bi₂O₃ glass powder pellets pressed at 50°C in the temperature range of 300 - 493 K. A plot of -log σ versus 1/T shows two different regions of conduction suggesting two types of conduction mechanisms switching from one type to another occurring at Rnee temperature. The de-conductivity increases with increase in temperature of the sample and also with increase of mol% of CuO. Activation energy calculated for both regions (LTR and HTR) is below 1 eV, thus the electrical conduction is electronic. Activation energy decreases with increase of mol% of CuO. Non-adiabatic hopping conduction was observed in the sample. A plot of dielectric constant versus log of frequency shows zig-zag nature. Dielectric constant decreases with increase in mol% of CuO. Page(s): 33-37

Transport properties of zinc-bismuth oxide glasses

1997-02-01T00:00:00Z

Title: Transport properties of zinc-bismuth oxide glasses Authors: Dhote, D S; Pakade, S V; Yawale, S P Abstract: Zinc-bismuth oxide glasses of 10-25 mol% of zinc oxide are prepared having thickness between 0.35-0.42 cm and diameter 0.60-0.95 cm. Physical properties such as density (d), molar volume (V), hopping distance (R), number of ions per cc (N) and polaron radius (r_p) are also reported. Polaron radius is found around 1.85 Å which shows formation of small polarons. Measurements of de electrical conductivity are reported in the temperature range 443-573K. - Log σ versus 1/T and –log µ versus 1/T plots exhibited linearity. Hopping condition given by Holstein was applied. Polaron band-width (J) satisfies the inequality which shows adiabatic hopping conduction. The density of Fermi level and the density of localized states are found to be close to each other. Page(s): 28-32

Software reliability modeling and decision making: An approach*

1997-02-01T00:00:00Z

Title: Software reliability modeling and decision making: An approach* Authors: Goyal, Rajesh Abstract: The aim of this paper is to briefly discuss, the available models for evaluating the reliability of software, along with their assumptions/limitations. This assessment shall finally give a step-by-step procedure for fitting a model to software failure data in order to obtain estimates of performance measures like undetected errors, mean time between failures and software reliability. This approach will help in deciding, whether the system is ready for release, or how much more testing still needs to be done? Page(s): 21-27

NOPR Collection:

Synthesis and characterisation of microcrystalline cellulose powder

Transport properties of amorphous CuO-Bi2O3 semiconducting pellets

Transport properties of zinc-bismuth oxide glasses

Software reliability modeling and decision making: An approach*

Transport properties of amorphous CuO-Bi₂O₃ semiconducting pellets