Showing papers by "Thapar University published in 1998"
TL;DR: In this paper, three-dimensional energy and heat conduction equations for fluid and bush temperatures and a one-dimensional equation for journal temperature have been solved and two alternative boundary conditions at the inlet have been examined.
37 citations
TL;DR: In this paper, an inelastic finite element model to simulate the behavior of reinforced concrete frames infilled with masonry panels subjected to static load and earthquake excitation has been presented.
32 citations
TL;DR: In this paper, a short pitch ferroelectric liquid crystal mixture FLC-6430 (Hoffmann-La-Roche) in the SmC* phase aligned with the FLC was used for dielectric measurements in the frequency range 100 Hz to 100 kHz.
Abstract: Dielectric measurements in the frequency range 100 Hz to 100 kHz have been carried out in a short pitch ferroelectric liquid crystal mixture FLC-6430 (Hoffmann-La-Roche) in the SmC* phase aligned i...
13 citations
TL;DR: The ultrasonic parameters of complex renal calculi and gall bladder stones, in vitro are measured using a double-probe contact by pulse-echo technique and are found to vary as a function of density of the specimen used.
Abstract: In this investigation, ultrasonic parameters of complex renal calculi and gall bladder stones, in vitro are measured using a double-probe contact by pulse-echo technique. Due to the variation in the chemical composition of the stones, a large variation in the value of ultrasonic parameters is found. A correlation between ultrasonic parameters and various renal calculi and gall bladder stone pathologies are also discussed. The ultrasonic parameters are found to vary as a function of density of the specimen used.
2 citations
TL;DR: In this article, the applicability of a-model of Marsh, et al. for prediction of the mechanical properties of composite solid propellants was considered. And improved correlations between mechanical properties and network parameters, applicable over a widerange of fonnulations, were arrived at.
Abstract: Forty formulations based on four different grades ofhydroxyl-terminated polybutadiene, HTPB(hydroxyl value 20- 40 mg KOHlg) at r = [NCO] / [OH] values in the range 0.7 -1.0 with varyingamounts of trimethylol propane and butane diol and containing 86 per cent solid loading wereconsidered to test the applicability of a.-model of Marsh, et al. for prediction of the mechanicalproperties of composite solid propellants. Two network parameters, crosslink density (Ve) andeffective chain length (LX), were calculated from the model. Tensile strength and modulus werecorrelated to Ve and elongation at break to LX. Using the correlations obtained from experimental dataat r< 0.8, mechanical properties of the various fonnulations were predicted. Good agreement betweenexperimental and predicted properties was obtained for fonnulations with modulus 10 KSC. Probablereasons for deviation observed at stoichiometric ratio r < 0.8 and low modulus values are discussed.Improved correlations between mechanical properties and network parameters, applicable over a widerange of fonnulations, were arrived at. The standard errors of prediction were found to be close to :+- 1 0-value of the measurement.
2 citations
17 Dec 1998
TL;DR: In this paper, a control system for the tubular reactor-unit has been synthesized, which is a combination of feedforward, feedback and inferential control configurations, and the reactor chosen is fast; transient period for a given disturbance varies between 20 and 100 sec.
Abstract: A control system for the tubular reactor-unit has been synthesized, which is a combination of feedforward, feedback and inferential control configurations. The reactor chosen is fast; transient period for a given disturbance varies between 20 and 100 sec, as found from numerical simulation. Therefore a fast on-line control scheme using heuristic approach has been used in which disturbances, manipulated variables and control variables are correlated based on the steady state model of the reactor. Testing of the control scheme has been conducted for both instantaneous as well as delayed control action by numerical simulation.