NOPR Community:

Modelling of packed column using artificial neural networks

Mon, 01 Nov 2004 00:00:00 GMT

Title: Modelling of packed column using artificial neural networks Authors: Pandharipande, S L; Mandavgane, S A Abstract: Packed column is an established gas liquid contacting device with many industrial applications. Estimation of liquid hold up and pressure drop as a function of gas and liquid flow rates for single as well as two phase flow are of significance from operational as well as design point of view. Various empirical models have been suggested for the same. Artificial Neural Networks (ANN) are gaining importance in modelling of multivariable, non-linear relationship with high accuracy and even in presence of inadequate data. In present work multi layer perceptron (MLP) ANN with GDR based learning have been developed for estimation of liquid hold up and pressure drop for packed column. The ANN models thus developed are observed to be of good accuracy level, both for training and test data set. Page(s): 820-824

Determination of serum and urinary urate with reusable uricase strip

Mon, 01 Nov 2004 00:00:00 GMT

Title: Determination of serum and urinary urate with reusable uricase strip Authors: Sushma; Rekha; Kumar, Vijay; Suman; Pundir, C S Abstract: Commercial uricase has been immobilized covalently onto alkylamine glass beads affixed on a plastic strip with a conjugation yield of 87mg/g and 11.5% retention of initial activity of free enzyme. Maximum activity of immobilized enzyme was attained at pH 8.8, when incubated at 40°C for 20 min. K_m for uric acid and V_max of immobilized enzyme were 0.15mM and 0.68µmoles H₂O₂/min respectively. A method for uric acid determination in serum and urine was developed using the strip bound enzyme. The method is based on the measurement of H₂O₂ generated from uric acid by using a colour reaction consisting of 4-aminophenazone, p-hydroxybenzoic acid and horseradish peroxidase as chromogenic system. The minimum detection limit of the method was 1.68mg/dl and recovery of added uric acid in urine was 90%. The coefficient of variation (CV) were <5 and <2% for within batch and between batch respectively. The immobilized enzyme lost 50% of its initial activity after its regular uses for over 3 weeks, when stored in 0.05M glycine NaOH buffer, pH 8.8 at 4°C. Page(s): 764-768

Studies of metal ion uptake behaviour of formaldehyde condensed resins of phenolic Schiff bases derived from the reaction of 4,4' -diaminodiphenyl and 4, 4' -diaminodiphenylmethane with o-hydroxybenzaldehyde

Wed, 01 Sep 2004 00:00:00 GMT

Title: Studies of metal ion uptake behaviour of formaldehyde condensed resins of phenolic Schiff bases derived from the reaction of 4,4' -diaminodiphenyl and 4, 4' -diaminodiphenylmethane with o-hydroxybenzaldehyde Authors: Dey, R K; Acharya, S; Samal, S; Ra, A R Abstract: The metal ion uptake characteristics of two new chelating resins, o-HB-DDM-HCHO and o-HB-DD-HCHO, were examined towards transition metal ions like Cu²⁺, Ni²⁺ and UO₂²⁺under both competitive and non-competitive conditions. The resin o-HB-DDM-HCHO was found to be more effective in removing metal ions in comparison to resin o-HB-DDHCHO. Preferential adsorption of Cu²⁺ by both the resins was observed from the mixture of salt solution. Elution of the sorbed metal ions using dilute HCI resulted in removal of nearly 30-40% of the loaded Cu²⁺ and 34-45% of loaded UO₂²⁺from the resin column. Page(s): 695-703

Studies of printing inks on starch blended and surface grafted polyethylene film for flexible packaging

Sat, 01 May 2004 00:00:00 GMT

Title: Studies of printing inks on starch blended and surface grafted polyethylene film for flexible packaging Authors: Ghosh, R N; Adhikari, B; Ray, B C Abstract: Grafted vinyl acetate surface of starch blended biodegradable polyethylene film was printed with industry standard printing inks based on polyamide resin and organic solvents. Various print and packaging properties were studied to find suitability of the use of such grafted polyethylene film in comparison to ungrafted starch blended polyethylene film and industry standard corona treated polyethylene film. The use of such grafted film was also comparatively studied in polyethylene laminate packaging. Prints and laminates using industrial standard grade polyethylene, starch blended biodegradable polyethylene and grafted starch blended polyethylene film, were put on soil burial test and studied for biodegradable properties. Page(s): 357-366