Showing papers by "Jadavpur University published in 2005"
TL;DR: In this paper, a thermophilic anaerobic microorganism is incorporated at different cell concentrations with the mixing water, and a 25% increase in 28 day compressive strength of cement mortar was achieved with the addition of about 105 cell/ml of mixing water.
366 citations
25 Jun 2005
TL;DR: Two new, improved variants of differential evolution are presented, shown to be statistically significantly better on a seven-function test bed for the following performance measures: solution quality, time to find the solution, frequency of finding the solutions, and scalability.
Abstract: Differential evolution (DE) is well known as a simple and efficient scheme for global optimization over continuous spaces. In this paper we present two new, improved variants of DE. Performance comparisons of the two proposed methods are provided against (a) the original DE, (b) the canonical particle swarm optimization (PSO), and (c) two PSO-variants. The new DE-variants are shown to be statistically significantly better on a seven-function test bed for the following performance measures: solution quality, time to find the solution, frequency of finding the solution, and scalability.
365 citations
TL;DR: In this article, the origin of p-type conductivity in transparent oxides is discussed and an up-to-date and comprehensive description of different P-type transparent conducting oxide thin films is presented.
328 citations
TL;DR: A metal-organic honeycomb-like 2D pillared-bilayer open framework has been constructed which shows dynamic sponge-like single-crystal-to-single-Crystal transformation upon dehydration and rehydration.
Abstract: A metal−organic honeycomb-like 2D pillared-bilayer open framework has been constructed which shows dynamic sponge-like single-crystal-to-single-crystal transformation upon dehydration and rehydration. The dehydrated acentric nonporous phase transformed to the porous centric phase with the selective adsorbate concomitant with the structural transformation correlated with the single-crystal structure determination.
305 citations
TL;DR: In this paper, the isolated contribution of silica fume on the tensile strengths of high performance concrete (HPC) is investigated. But the results indicate that the optimum replacement percentage is not a constant one but depends on the water-cementitious material (w/cm) ratio of the mix.
286 citations
TL;DR: Micropolarities in the two proteinous environments have been determined following the polarity sensitivity of the CT emission and addition of urea to the protein-bound systems leads to a reduction in the fluorescence anisotropy indicating the denaturation of the proteins.
Abstract: Interaction of 3-acetyl-4-oxo-6,7-dihydro-12H indolo-[2,3-a] quinolizine (AODIQ), a biologically active molecule, with model transport proteins, bovine serum albumin (BSA) and human serum albumin (HSA) have been studied using steady state and picosecond time-resolved fluorescence and fluorescence anisotropy. The polarity dependent intramolecular charge transfer (ICT) process is responsible for the remarkable sensitivity of this biological fluorophore to the protein environments. The CT fluorescence exhibits appreciable hypsochromic shift along with an enhancement in the fluorescence yield, fluorescence anisotropy (r) and fluorescence lifetime upon binding with the proteins. The reduction in the rate of ICT within the hydrophobic interior of albumins leads to an increase in the fluorescence yield and lifetime. Marked increase in the fluorescence anisotropy indicates that the probe molecule is located in a motionally constrained environment within the proteins. Micropolarities in the two proteinous environments have been determined following the polarity sensitivity of the CT emission. Addition of urea to the protein-bound systems leads to a reduction in the fluorescence anisotropy indicating the denaturation of the proteins. Polarity measurements and fluorescence resonance energy transfer (FRET) studies throw light in assessing the location of the fluorophore within the two proteinous media.
286 citations
TL;DR: The effectiveness of the PBMF index as the optimization criterion along with a genetic fuzzy partitioning technique is demonstrated on a number of artificial and real data sets including a remote sensing image of the city of Kolkata.
199 citations
TL;DR: In this article, a novel multiobjective optimization method for economic emission load dispatch of fixed head hydro plants and thermal plants with nonsmooth fuel cost and emission level functions is presented.
187 citations
TL;DR: Two novel isomorphous porous frameworks of Ln(III) have been synthesized hydrothermally using multifunctional 4,5-imidazoledicarboxylic acid (imidc) as a connector and exhibit selective adsorption properties for H2O over N2, CO2 and MeOH.
179 citations
TL;DR: In this paper, an integrated model combining AHP and QFD has been delineated for the industrial robot selection problem, where seven technical requirement factors have been considered for the case study.
Abstract: Selection of a robot is an important task, as improper selection may adversely affect a firm's production by reducing the quality of the product, thereby reducing productivity as well as profitability. To effectively select a robot for a specified job, several factors have to be considered. The objective of this paper is to explain how, using a combined AHP/QFD model, the authors are able to determine if the deployment of robots in industry helped in performance enhancement from requirement perspective. Incorporating a simple and novel cost factor measure in the proposed integrated AHP/QFD model aids justification of the implementation of a robotic system in a manufacturing firm from an economic point of view also. The proposed integrated approach also identifies technical requirements followed by customer requirements. In this paper, an integrated model combining AHP and QFD has been delineated for the industrial robot selection problem. Seven technical requirement factors have been considered for the case study.
175 citations
TL;DR: The results suggest that methanol extract obtained from Bauhinia racemosa stem bark possess potent anti-inflammatory, analgesic and antipyretic activity.
TL;DR: In this paper, an extensive research study has been carried out with an aim to select the optimum cutting condition with an appropriate wire offset setting in order to get the desired surface finish and dimensional accuracy.
TL;DR: The results have been analyzed in terms of the equations of Clint, Motomura, Rosen, Rubingh, Blankschtein et al. for justification of the experimental cmc, determination of micellar composition parameters, quantification of interaction among the mixed micelle components, and estimation of their activity coefficients.
Abstract: Mixed micelles formed with cetyl pyridinium chloride (CPC), cetyl trimethylammonium bromide (CTAB), and polyoxyethylene (10) cetyl ether (Brij-56) mixed in different combinations in aqueous medium have been studied in detail by tensiometric, conductometric, calorimetric, spectrophotometric, and fluorimetric techniques. Different physicochemical properties such as critical micellar concentration (cmc), micellar dissociation, energetic parameters (free energy, enthalpy, and entropy) of micellization, interfacial adsorption, and micellar aggregation number have been determined. The results have been analyzed in terms of the equations of Clint, Motomura, Rosen, Rubingh, Blankschtein et al., and Rubingh and Holland for justification of the experimental cmc, determination of micellar composition parameters, quantification of interaction among the mixed micelle components, and estimation of their activity coefficients.
TL;DR: In the course of bio‐assay guided fractionation, emodin and physcion were isolated for the first time from the stem‐bark of V. madraspatana and found to be more effective, showing an MIC of 70 µg/mL compared with streptomycin and penicillin G used as standards.
Abstract: The antibacterial activity of the extracts of Ventilago madraspatana stem-bark, Rubia cordifolia root and Lantana camara root-bark, prepared with solvents of different polarity, was evaluated by the agar-well diffusion method. Twelve bacteria, six each of gram-positive and gram-negative strains, were used in this study. Chloroform and ethanol extracts of V. madraspatana showed broad-spectrum activity against most of the bacteria except S. aureus, E. coli and V. cholerae. On the other hand, the activity of the chloroform and methanol extracts of R. cordifolia and L. camara was found to be more specific towards the gram-positive strains, although gram-negative P. aeruginosa was also inhibited by the methanol extracts of both these plants in a dose dependent manner. The water extracts of V. madraspatana and L. camara were found to be inactive, while that of R. cordifolia was significantly active against B. subtilis and S. aureus compared with streptomycin and penicillin G used as standards. In the course of bio-assay guided fractionation, emodin and physcion were isolated for the first time from the stem-bark of V. madraspatana. It was noteworthy to find the MICs of emodin in the range 0.5-2.0 microg/mL against three Bacillus sp. Both the anthraquinonoid compounds inhibited P. aeruginosa, emodin being more effective, showing an MIC of 70 microg/mL.
TL;DR: A good correlation has been found among the photovoltage generation in the systems consisting of some anionic xanthene dyes and TX-100, spectral shift due to complex formation and thermodynamic properties of these complexes.
TL;DR: PVP-EC polymers are better suited than PVP-Eudragit polymers for the development of TDDS of dexamethasone, and in vitro dissolution studies showed that the drug distribution in the matrix was homogeneous.
Journal Article•
25 Feb 2005-Journal of pharmacy & pharmaceutical sciences : a publication of the Canadian Society for Pharmaceutical Sciences
TL;DR: The results point out the possible anti-diarrhoeal effect of the plant extracts and substantiate the use of this herbal remedy as a non-specific treatment for diarrhoea in folk medicine.
Abstract: PURPOSE: Asparagus racemosus Wild root has been used traditionally in Ayurveda for the treat- ment of diarrhoea and dysentery. However, the claims of Ayurveda need to be validated by a suitable experi- mental model. Therefore, the present study was under- taken to evaluate the effect of ethanol and aqueous extracts of Asparagus racemosus for its antidiarrhoeal potential against several experimental models of diar- rhoea in Albino Wistar rats. METHODS: The antidi- arrhoeal activity of ethanol and aqueous extracts of Asparagus racemosus root was evaluated using castor oil-induced diarrhoea model in rats. Further, we evalu- ated the effect of ethanol and aqueous extracts on gas- trointestinal tract motility after charcoal meal administration and PGE 2 induced intestinal fluid accu- mulation (enteropooling). Loperamide was used as pos- itive control. RESULTS: The plant extracts showed significant (P < 0.05) inhibitor activity against castor oil induced diarrhoea and PGE 2 induced enteropooling in rats when tested at 200 mg/kg. Both extracts also showed significant (P < 0.001) reduction in gas- trointestinal motility in charcoal meal test in rats. CONCLUSION: The results point out the possible anti-diarrhoeal effect of the plant extracts and substan- tiate the use of this herbal remedy as a non-specific treatment for diarrhoea in folk medicine.
TL;DR: In this article, the machinability of silicon carbide particulate aluminium metal matrix composite during turning using a rhombic uncoated carbide tool has been investigated, and the influence of machining parameters, e.g. cutting speed, feed, and depth of cut on the cutting force was investigated.
Abstract: The paper presents the result of an experimental investigation on the machinability of silicon carbide particulate aluminium metal matrix composite during turning using a rhombic uncoated carbide tool. The influence of machining parameters, e.g. cutting speed, feed and depth of cut on the cutting force has been investigated. The influence of the length of machining and cutting time on the tool wear and the influence of various machining parameters, e.g. cutting speed, feed, depth of cut on the surface finish criteria has been analyzed through the various graphical representations. The combined effect of cutting speed and feed on the flank wear has also been investigated. The influence of cutting speed, feed and depth of cut on the tool wears and built-up edge is analyzed graphically. The job surface condition and wear of the cutting tool edge for the different sets of experiments have been examined and compared for searching out the suitable cutting condition for effective machining performance during turning of Al/SiC-MMC. Test results show that no built-up edge is formed during machining of Al/SiC-MMC at high speed and low depth of cut. From the test results and different SEM micrographs, suitable range of cutting speed, feed and depth of cut can be selected for proper machining of Al/SiC-MMC.
TL;DR: The results obtained indicate that methanol extract of Bauhinia racemosa (MEBR) can be a potential source of natural antioxidant and antimicrobial agents.
Abstract: The present study was carried out to evaluate the antioxidant and antimicrobial activities of a methanol extract of Bauhinia racemosa (MEBR) (Caesalpiniaceae) stem bark in various systems. 1,1-Diphenyl-2-picryl-hydrazyl (DPPH) radical, superoxide anion radical, nitric oxide radical, and hydroxyl radical scavenging assays were carried out to evaluate the antioxidant potential of the extract. The antioxidant activity of the methanol extract increased in a concentration-dependent manner. About 50, 100, 250, and 500 µg MEBR inhibited the peroxidation of a linoleic acid emulsion by 62.43, 67.21, 71.04, and 76.83%, respectively. Similarly, the effect of MEBR on reducing power increased in a concentration-dependent manner. In DPPH radical scavenging assays the IC50 value of the extract was 152.29 µg/ml. MEBR inhibited the nitric oxide radicals generated from sodium nitroprusside with an IC50 of 78.34 µg/ml, as opposed to 20.4 µg/ml for curcumin. Moreover, MEBR scavenged the superoxide generated by the PMS/NADH-NBT system. MEBR also inhibited the hydroxyl radical generated by Fenton's reaction, with an IC50 value of more than 1000 µg/ml, as compared to 5 µg/ml for catechin. The amounts of total phenolic compounds were also determined and 64.7 µg pyrocatechol phenol equivalents were detected in MEBR (1 mg). The antimicrobial activities of MEBR were determined by disc diffusion with five Gram-positive, four Gram-negative and four fungal species. MEBR showed broad-spectrum antimicrobial activity against all tested microorganisms. The results obtained in the present study indicate that MEBR can be a potential source of natural antioxidant and antimicrobial agents.
TL;DR: In this paper, an attempt has been made to model the white layer depth through response surface methodology (RSM) in a WEDM process comprising a rough cut followed by a trim cut.
Abstract: A white layer is considered a major flaw on a workpiece surface machined with wire-cut electrical discharge machining (WEDM). In this paper, an attempt has been made to model the white layer depth through response surface methodology (RSM) in a WEDM process comprising a rough cut followed by a trim cut. An experimental plan for rotatable central composite design of second order involving four variables with five levels has been employed to carry out the experimental investigation and subsequently to establish the mathematical model correlating the input process parameters with the response. Pulse on time during rough cutting, pulse on time, wire tool offset, and constant cutting speed during trim cutting are considered the dominant input process parameters whilst the white layer depth is the response. An insignificant “lack of fit” term indicated a curve with a good fit. Also, an extensive analysis of the influences of all the individual input parameters on the response has been carried out and presented in this research study.
TL;DR: In this paper, the effect of postdeposition annealing time in excess oxygen on electrical and thermoelectric properties of transparent p-type CuAlO2 thin films was studied in detail.
TL;DR: In this paper, experimental and numerical investigations of magnetically induced localization of ferrofluid and its subsequent dispersion are performed in a forced flow and the results of the analysis provide meaningful information on ferro-fluid transport for various magnetic drug targeting applications.
TL;DR: Acylation of heteroatoms (O, N and S) with acetyl chloride based on the use of a catalytic amount of the moisture stable, inexpensive ZrOCl2·8H2O, proceeds efficiently producing the corresponding acylated products in excellent yields as discussed by the authors.
TL;DR: Drug release from RALG-PEI beads in SIF was considerably prolonged for different periods of time depending upon the conditions of PEI treatment, and Kinetics of the drug release confirmed the formation of physical barrier as anomalous transport type of release associated with.
TL;DR: In this paper, the performance of five different dual-phase (DP) steels with varying morphologies and martensite content has been assessed in comparison to a ferrite-pearlite steel in 3.5% NaCl solution.
TL;DR: Arsenic contaminated aquifers are pervasive within lowland organic rich, clayey deltaic sediments in the Bengal Basin and locally within similar facies in narrow, entrenched river valleys within the Ganga Alluvial Plain this article.
TL;DR: Multisystemic disorders, including dermal effects, neurological complications, and adverse obstetric outcomes, were observed to be associated with chronic arsenic exposure in the study population in Murshidabad, West Bengal.
Abstract: Introduction. To understand the severity of related health effects of chronic arsenic exposure in West Bengal, a detailed 3-year study was carried out in Murshidabad, one of the nine arsenic-affected districts in West Bengal. Methods. We screened 25,274 people from 139 arsenic-affected villages in Murshidabad to identify patients suffering from chronic arsenic toxicity for evidence of multisystemic features and collected biological samples such as head hair, nail, and spot urine from the patients along with the tubewell water they were consuming. Results. Out of 25,274 people screened, 4813 (19%) were registered with arsenical skin lesions. A case series involving arsenical skin lesions resulting in cancer and gangrene were noted during this study. Representative histopathological pictures of skin biopsy of different types of lesions were also presented. Out of 2595 children we examined for arsenical skin lesions, 122 (4%) were registered with arsenical skin lesions, melanosis with or without keratosis. D...
TL;DR: A vast population of the block may have arsenic body burden and cases of Bowen's disease and cancer have been identified among adults who also show arsenical skin lesions and children in this block are also seriously affected.
TL;DR: The Baghmundi block of Purulia district, West Bengal is within the hard rock terrain of Ayodhya hills and Matha Protected forest and the groundwater in this region is confined within the fracture zones and weathered residuum as mentioned in this paper.
Abstract: Groundwater being a valuable resource in today’s world needs proper evaluation and management for overall development within the region for its judicious use. The Baghmundi Block of Purulia district, West Bengal is within the hard rock terrain of Ayodhya hills and Matha Protected forest. The groundwater in this region is confined within the fracture zones and weathered residuum. Hydrogeomorphologically, the entire area is classified into following categories such as - i) Very shallow weathered pediment, ii) Moderately weathered pediment, iii) Valley fills, iv) Erosional gullies, v) Lateritic Upland and vi) Accumulation gullies.
TL;DR: In this article, the influence of various electrochemical micromachining parameters like machining voltage, electrolyte concentration, pulse period and frequency on material removal rate, accuracy and surface finish in microscopic domain is highlighted.