Controlled defects in ZnO by low energy Ar irradiation (2009)
Chattopadhyay, Soubhik, Dutta, Sreetama, Jana, D., Chattopadhyay, S., Sarkar, A., Kumar, P., ...
We report interesting observations in 1.2 MeV Ar8+ ion irradiated ZnO which, to the best of our knowledge, have not been published earlier and will be useful for the scientific community engaged in...
Effective dimensionality of the Portevin - Le Chatelier effect (2009)
Chatterjee, A., Gayathri, N., Sarkar, A., Mukherjee, P., Barat, P.
Tensile tests have been carried out by deforming polycrystalline samples of substitutional Al-2.5%Mg alloy at room temperature at a range of strain rates. The Portevin - Le Chatelier (PLC) effect was...
A. Sarkar, L. Nataraj, B. S. Manjunath, U. Madhow
Our recently introduced JPEG steganographic method called Yet Another Steganographic Scheme (YASS) can resist blind steganalysis by embedding data in the discrete cosine transform (DCT) domain in...
Synthesis and characterization of single phase Mn doped ZnO (2009)
Chattopadhyay, Soubhik, Dutta, S., Banerjee, Aritra, Jana, D., Bandyopadhyay, S., Chattopadhyay, Sanjay, ...
Different samples of Zn1-xMnxO series have been prepared by conventional solid state sintering method. It has been identified, up to what extent of doping enable us to synthesize single-phase...
USING LIKELIHOOD L-STATISTICS TO MEASURE CONFIDENCE IN AUDIO-VISUAL SPEECH RECOGNITION (2008)
Arpita Ghosh, Ashish Verma, A Sarkar
Abstract- This paper describes recent work on decision fusion in audiovisual speech recognition. In this work, a novel approach is proposed to combine audio and video channel information in...
Robust Nonparametric Relevance Feedback for Image Retrieval (2008)
Ashwin T. V, S. Ghosal, A. Sarkar, N. Jain, S. Sarkar
Most interactive, “query-by-example ” based image retrieval systems employ relevance feedback technique for bridging the gap between the user-defined high-level concept and the low-level image...
Determination of urinary peptides in patients with proteinuria (2008)
Prakash, M, Shetty, JK, Dash, S, Barik, BK, Sarkar, A, Prabhu, R
Effect of Meditation on Scaling Behavior and Complexity of Human Heart Rate Variability (2008)
The heart beat data recorded from samples before and during meditation are analyzed using two different scaling analysis methods. These analyses revealed that meditation severely affects the long...
A. Sarkar, N. Banerjee, P. Nair, A. Banerjee, S. Brahma, B. Kartikeyan, ...
Abstract. A technique has been suggested for multisensor data fusion to obtain landcover classification. It takes care of feature level fusion with Dempster-Shafer rule and data level fusion with...
Chatterjee, A., Sarkar, A., Barat, P., Mukherjee, P., Gayathri, N.
The Portevin-Le Chatelier(PLC) effect has been investigated by deforming Al-2.5%Mg alloy in the strain rate regime where simultaneously two types (type B and type A) of serrations appear in the...
Clustering Algorithms for Wireless Ad Hoc Networks (2008)
Lakshmi Ramach, Manika Kapoor, A Sarkar, Alok Aggarwal
Efficient clustering algorithms play a very important role in the fast connection establishment of ad hoc networks. In this paper, we describe a communication model that is derived directly from that...
Markov Property of Continuous Dislocation Band Propagation (2008)
Chatterjee, A., Sarkar, A., Bhattacharya, Sourav, Mukherjee, P., Gayathri, N., Barat, P.
Tensile tests were carried out by deforming polycrystalline samples of substitutional Al-2.5%Mg alloy at room temperature for a range of strain rates. The Portevin-Le Chatelier (PLC) effect was...
Sarkar, A., Gaitonde, D.C.S., Sarkar, Amit, Vashistha, D., DeSilva, C., Dalal, S.G.
The measurement of the impairment of DNA in marine gastropod (Cronia contracta) provides an insight into the genotoxic effects of contaminants on marine organisms along the Goa coast. The impact of...
Specific Glial Populations Regulate Hippocampal Morphogenesis (2008)
Barry, G., Piper, M., Lindwall, C., Moldrich, R., Mason, S., Little, E., ...
The hippocampus plays an integral role in spatial navigation, learning and memory, and is a major site for adult neurogenesis. Critical to these functions is the proper organization of the...
DOI 10.1140/ep je/i2002-10113-2 Eur. Phys. J. E 10, 249--263 (2003) (2007)
The European Phy, S. Cocco, J. F. Marko, R. Monasson, A. Sarkar, J. Yan
The elasticresp onse of flexiblep olymers made of elements which can be either folded or unfolded, having di#erent lengths in these two states, is discussed. These situations are common forbiop...
Recurrence analysis of the Portevin-Le Chatelier effect (2007)
Sarkar, A., Webber Jr., Charles L., Barat, P., Mukherjee, P.
Tensile tests were carried out by deforming polycrystalline samples of Al-2.5%Mg alloy at room temperature in a wide range of strain rates where the Portevin-Le Chatelier (PLC) effect was observed....
Molecular dynamics simulation of rapid solidification of Aluminum under pressure (2007)
Sarkar, A., Barat, P., Mukherjee, P.
Molecular dynamics simulation study based on the EAM potential is carried out to investigate the effect of pressure on the rapid solidification of Aluminum. The radial distribution function is used...
Sarkar, A., Mukherjee, P., Barat, P.
The anisotropic broadening of ZrSiO4 sample is modelled using the Stephens's phenomenological model for anisotropic line broadening and the three dimensional strain distribution in the sample is...
Characterization of irradiated microstructure by X-ray diffraction line profile analysis (2007)
Sarkar, A., Mukherjee, P., Barat, P.
Zirconium based alloys have been irradiated with 11 and 15 MeV proton and 116 MeV oxygen ions at different doses. The changes in the microstructure have been studied for the ion irradiated alloys as...
Sarkar, A., Mukherjee, P., Barat, P.
The diffraction peaks of Zircaloy-2 and Zr-2.5%Nb alloys at various deformations are found to be asymmetric in nature. In order to characterize the microstructure from these asymmetric peaks of these...
Comparison of wind data from QuikSCAT and buoys in the Indian Ocean (2007)
Satheesan, K., Sarkar, A., Parekh, A., RameshKumar, M.R., Kuroda, Y.
The performance of QuikSCAT-derived wind vectors is evaluated using in-situ data from moored buoys over the Indian Ocean. The results show that the mean differences for wind speed and wind direction...
A. Sarkar, K. Solanki, U. Madhow, S. Ch, B. S. Manjunath
We present practical approaches for steganography that can provide improved security by closely matching the second-order statistics of the host rather than just the marginal distribution. The...
The Portevin-Le Chatelier effect in the Continuous Time Random Walk framework (2006)
We present a continuous time random walk model for the Portevin-Le Chatelier (PLC) effect. From our result it is shown that the dynamics of the PLC band can be explained in terms of the Levy Walk.
Effect of meditation on scaling behavior and complexity of human heart rate variability (2006)
The heart beat data recorded from samples before and during meditation are analyzed using two different scaling analysis methods. These analyses revealed that mediation severely affects the long...
Development of RP-HPLC for analysis of human insulin (2006)
Rajan, DS, Gowda, KV, Mandal, U, Ganesan, M, Bose, A, Sarkar, A, ...
Scaling Behaviour and Complexity of the Portevin-Le Chatelier Effect (2006)
The plastic deformation of dilute alloys is often accompanied by plastic instabilities due to dynamic strain aging and dislocation interaction. The repeated breakaway of dislocations from and their...
Sarkar, A., Mukherjee, P., Barat, P.
Different techniques of the X-ray Diffraction Line Profile Analysis (XRDLPA) have been used to assess the microstructure of the irradiated Zr-1.0%Nb-1.0%Sn-0.1%Fe alloy. The domain size, microstrain,...
Lattice Misfit Measurement in Inconel 625 by X-Ray Diffraction Technique (2006)
Mukherjee, P., Sarkar, A., Barat, P., Jayakumar, T., Mahadevan, S., Rai, Sanjay K.
Determination of lattice misfit and microstructural parameters of the coherent precipitates in Ni based alloy Inconel-625 is a challenging problem as their peaks are completely overlapping among...
Multiscale Entropy Analysis of the Portevin-Le Chatelier Effect in an Al-2.5%Mg Alloy (2006)
Sarkar, A., Barat, P., Mukherjee, P.
The complexity of the Portevin-Le Chatelier effect in Al-2.5%Mg polycrystalline samples subjected to uniaxial tensile tests is quantified. Multiscale entropy analysis is carried out on the stress...
Multiscale Entropy Analysis: A New Method to Detect Determinism in a Time Series (2006)
In this letter we show that the Multiscale Entropy (MSE) analysis can detect the determinism in a time series.
Sarkar, A., Chatterjee, A., Barat, P., Mukherjee, P.
Tensile tests were carried out by deforming polycrystalline samples of an interstitial alloy, low carbon steel at room temperature in a wide range of strain rates where the Portevin-Le Chatelier...
Scaling Behavior of Portevin-Le Chatelier Effect (2006)
Sarkar, A., Barat, P., Mukherjee, P., Bandyopadhyay, S. K.
The scaling behavior of the Portevin-Le Chatelier (PLC) effect is studied by deforming a substitutional alloy, Al-2.5%Mg and an interstitial alloy, low carbon steel (0.15%C, 0.33%Mn, 0.04%P, 0.05%S,...
Portevin-Le Chatelier Effect: a Poisson Process (2006)
Barat, P., Sarkar, A., Barat, Arnab
The Portevin-Le Chatelier (PLC) effect is a kind of plastic instability observed in many dilute alloys when deformed at certain ranges of strain rate and temperature. In this letter we establish that...
Shirodkar, P.V., Xiao, Y.K., Sarkar, A., Dalal, S.G., Chivas, A.R.
The behaviors of chlorine isotopes in relation to air-sea flux variables have been investigated through multivariate statistical analyses (MSA). The MSA technique provides an approach to reduce the...
De, J., Ramaiah, N., Sarkar, A.
Hitherto, aerobic degradation of polychlorinated biphenyls (PCBs) has been reported to be limited to the less chlorinated biphenyls. A marine mercury-resistant bacterium, Pseudomonas CH07 (NRRL...
Wave modelling for the North Indian Ocean using MSMR analysed winds (2006)
Vethamony, P., Sudheesh, K., Rupali, S.P., Babu, M.T., Jayakumar, S., Saran, A.K., ...
NCMRWF (National Centre for Medium Range Weather Forecast) winds assimilated with MSMR (Multi-channel Scanning Microwave Radiometer) winds are used as input to MIKE21 Offshore Spectral Wave model...
Bioremediation of toxic substances by mercury resistant marine bacteria (2006)
De, J., Sarkar, A., Ramaiah, N.
Bioremediation of toxic substances includes microbe-mediated enzymatic transformation of toxicants to non-toxic, often assimilable, forms. Mercury-resistant marine bacteria are found to be very...
Gaitonde, D., Sarkar, A., Kaisary, S., DeSilva, C., Dias, C.F.M., ...
The measurement of acetylcholinesterase (AChE) activity is used worldwide as a biomarker of environmental contamination due to neurotoxic substances. In the present study the AChE activities was...
Molecular Biomarkers: Their significance and application in marine pollution monitoring (2006)
Sarkar, A., Ray, D., Shrivastava, A.N., Sarkar, S.
This paper presents an overview of the significance of the use of molecular biomarkers as diagnostic and prognostic tools for marine pollution monitoring. In order to assess the impact of highly...
Mukherjee, P., Sarkar, A., Barat, P., Raj, Baldev, Mudali, U. Kamachi
The microstructural parameters like the average domain size, effective domain size at a particular crystallographic direction and microstrain within the domains of titanium and Ti-5%Ta-2%Nb,...
Analysis of Rainfall records in India: Self Organized Criticality and Scaling (2005)
The time series data of the monthly rainfall records (for the time period 1871-2002) in All India and different regions of India are analyzed. It is found that the distributions of the rainfall...
Effect of transient change in strain rate on plastic flow behavior of low carbon steel (2005)
Ray, A., Barat, P., Mukherjee, P., Sarkar, A., Bandyopadhyay, S. K.
Plastic flow behavior of low carbon steel has been studied at room temperature during tensile deformation by varying the initial strain rate of 3.3x10e-4 1/sec to the final strain rate ranging from...
Studies on Neon irradiated amorphous carbon using X-ray Diffraction technique (2005)
Sarkar, A., Dasgupta, K., Barat, P., Mukherjee, P., Sathiyamoorthy, D.
Two sets of amorphous carbon materials prepared at different routes are irradiated with swift (145 MeV) heavy ion (Ne6+). The structural parameters like the size of ordered grains along c and a axis...
Scaling Analysis on Indian Foreign Exchange Market (2005)
In this paper we investigate the scaling behavior of the average daily exchange rate returns of the Indian Rupee against four foreign currencies namely US Dollar, Euro, Great Britain Pound and...
This chapter presents an overview of various techniques of detection of different types of pollutants such as organochlorine pesticides (e.g. DDT, HCHs, aldrin, dieldrin, endrin, Hepox, heptaclor),...
Scaling Behavior of the Portevin-Le Chatelier Effect in an Al-2.5%Mg Alloy (2004)
Barat, P., Sarkar, A., Mukherjee, P., Bandyopadhyay, S. K.
The scaling behavior of the Portevin-Le Chatelier (PLC) effect was studied by deforming Al-2.5%Mg alloy for a wide range of strain rates. To reveal the exact scaling nature, the time series data of...
Chanda, M, Sarkar, A, Chen, ZW
A fabric made of 100% acrylic fiber "Cashmilon" was partially hydrolyzed to convert a fraction of its nitrile (-CN) groups to carboxylic acid (-COOH) groups and then gel-coated with polyethyleneimine...
Chanda, M, Sarkar, A, Chen, ZW
A fabric made of 100% acrylic fiber "Cashmilon" was partially hydrolyzed to convert a fraction of its nitrile (-CN) groups to carboxylic acid (-COOH) groups and then gel-coated with polyethyleneimine...
Chakrabarti, Mahuya, Sarkar, A., Chattapadhayay, S., Sanyal, D., Pradhan, A. K., Bhattacharya, R., ...
The temperature dependent (30 K to 300 K) Doppler broadening of the positron annihilated g-radiation (DBPAR) measurement has been carried out on single crystalline Bi-2212 high Tc superconducting...
Utilisation of deep venous thrombosis prophylaxis in medical / surgical intensive care units (2003)
Todi, S, Sinha, S, Chakraborty, A, Sarkar, A, Gupta, S, Das, T, ...
Dielectric Studies of Laser Ablated Ca Doped $BaTiO_3$ Thin Films (2003)
Victor, P, Ranjith, R, Sarkar, A, Vinayak, R, Saha, S, Krupanidhi, SB
Recently, there has been growing interest in Ca modified $BaTiO_3$ structures due to their larger electro-optic coefficients for their use in optical storage of information over conventional...
Dielectric Studies of Laser Ablated Ca Doped $BaTiO_3$ Thin Films (2002)
Victor, P, Ranjith, R, Sarkar, A, Vinayak, R, Saha, S, Krupanidhi, SB
Recently, there has been growing interest in Ca modified $BaTiO_3$ structures due to their larger electro-optic coefficients for their use in optical storage of information over conventional...
Marine toxins and their toxicological significance: An overview (2002)
This article presents an overview of various types of marine toxins and their toxicological significance in the context of biotechnological research and development. The characteristics and toxic...
Ocean energy conversion - A reality (2002)
This chapter presents an overview of ocean energy conversion in respect of its significance as the renewable energy resources. It deals with the thermodynamic principles relating to ocean thermal...
Medmesh summarizer: text mining for gene clusters (2002)
P. Kankar, S. Adak, A. Sarkar, K. Murari, G. Sharma, Gene Expression
Gene Expression is the process by which a gene’s coded information is translated into the proteins present and operating in the cell. Changes in gene expression are associated with many important...
Thermoplastic composites from cyanoethylated wood and high density polyethylene (2001)
Sarkar, A, Pillay, SA, Sailaja, RRN, Chanda, M
Cyanoethylated cellulose samples of different degrees of substitution (or nitrogen content) have been prepared and intrinsic viscosity has been measured which shows that cellulose undergoes no...
Thermoplastic composites from cyanoethylated wood and high density polyethylene (2001)
Sarkar, A, Pillay, SA, Sailaja, RRN, Chanda, M
Cyanoethylated cellulose samples of different degrees of substitution (or nitrogen content) have been prepared and intrinsic viscosity has been measured which shows that cellulose undergoes no...
Wave climatology of the Indian Ocean derived from altimetry and wave model (2000)
Vethamony, P., Rao, L.V.G., Kumar, R., Sarkar, A., Mohan, M., Sudheesh, K., ...
GEOSAT altimeter data for the period 1986-1989 have been utilised to derive wave climatology for the Indian Ocean region bounded by 20 degrees S to 25 degrees N and 40 degrees E to 110 degrees E. The...
Current trends of some organochlorinated pesticides in Yamuna River sediments around Delhi (1999)
Sethi, P.K., Bhattacharyya, A.K., Sarkar, A.
Organochlorinated pesticides viz. DDTs, HCHs, and Cyclodiene compounds have been detected in the sediment samples of Yamuna River around Delhi, India during the three seasons namely pre-monsoon,...
CRITICAL SEISMIC VECTOR RANDOM EXCITATIONS FOR MULTIPLY SUPPORTED STRUCTURES (1998)
A method for determining critical power spectral density matrix models for earthquake excitations which maximize steady response variance of linear multiply supported extended structures and which...
The changed flow pattern of pulsatile blood flow in a catheterized stenosed artery has been studied through a mathematical model. The study takes into account the effect the movement of the flexible...
Riverine input of chlorinated hydrocarbons in the coastal pollution (1998)
This chapter presents an overview of the contamination of the coastal ecosystem of the North Sea, Arabian Sea, Bay of Bengal, East China Sea, Atlantic Sea, Aegean Sea, East Java Sea, Australian coast...
Backbends in directed percolation (1997)
Roy, R., Sarkar, A., White, D.G.
When directed percolation in a bond percolation process does not occur any path to innity on the open bonds will zigzag back and forth through the lattice Backbends are the portions of the zigzags...
Sarkar, A., Nagarajan, R., Chaphadkar, S., Pal, S., Singbal, S.Y.S.
The levels of contamination of various organochlorine pesticides in HCHs, DDTs aldrine dieldrin and endrin were determined in marine and estuarine sediments along the west coast of India. The...
The highest response of multi-supported structures subjected to partially specified multi-component earthquake support motions is considered. The seismic inputs are modelled as incompletely specified...
The highest response of multi-supported structures subjected to partially specified multi-component earthquake support motions is considered. The seismic inputs are modelled as incompletely specified...
Vethamony, P., Vaithiyanathan, R., Almeida, A.M., Santanam, K., Rao, L.V.G., Sarkar, A., ...
Geosat altimeter data for the period November 1986-October 1987 over the north Indian Ocean have been processed to retrieve wind speeds and significant wave heights. Smoothed Brown algorithm is used...
The interrelationship between mean proloculus size (MPS), delta super(18) O and delta super(13) C vatiations in benthic foraminiferal species Rotalidium annectens and their relation with temperature...
On chlorinated hydrocarbons in the Indian Ocean (1992)
The data available on the distribution of organochlorine compounds such as DDT and its metabolites, aldrin, dieldrin, endrin, isomers of HCH and the PCBs in the sediments, water, zooplankton, fish...
Organochlorine pesticide residues in the northern Indian Ocean (1992)
The coastal waters of India receive about 4.4Km sup(3) of domestic sewage and 0.44 Km sup(3) of industrial wastes, annually. A concerted effort is being made for about a decade now to assess the...
Evaluation of the toxicity of organic matter in marine sediments (1992)
The inhibitory effects of the organics from the sediment along the east coast of India on acetylcholinesterase (AChE) in-vitro were evaluated. Sediment samples collected from the surface layers at...
Sarkar, A., Rajkumar, R., Gairola, R.M., Gohil, B.S., Vethamony, P., Rao, L.V.G.
With the aim of retrieving, validating and mapping ocean surface winds and waves in the north Indian Ocean, GEOSAT altimeter data for the period November 1986 to October 1987 and available sea truth...
An attempt has been made to determine the concentration of different organochlorine pesticides in the seawater off the central West Coast of India using an in-situ-sampler. The Seastar in-situ...
Evaluation of the toxicity of organic matter in marine sediments (1991)
The inhibitory effects of the organics from the sediment along the east coast of India on acetylcholinesterase (AChE) in-vitro were evaluated. Sediment samples collected from the surface layers at...
Pesticide residues in sediments from the west coast of India (1991)
An average of 55,000 t of pesticides (including or organochlorine compounds) are used every year in India for agricultural purposes. The cumulative effects of these pesticides on the coastal...
SenGupta, R., Sarkar, A., Kureishy, T.W.
A study on the biodegradation of methyl isocyanate (MIC) and its anticholinesterase activities in different tissues of various species of fishes from the lakes of Bhopal was carried out over a period...
Gurusiddaiah, S, Weller, D M, Sarkar, A, Cook, R J
The production, isolation, and characterization of an antibiotic substance from cultures of Pseudomonas fluorescens 2-79 (NRRL B-15132) is described. P. fluorescens 2-79 originally was isolated from...
Antifungal macrodiolide from Streptomyces sp.
Jois, H R, Sarkar, A, Gurusiddaiah, S
Aerobic fermentation cultures of Streptomyces sp. produced an antifungal macrodiolide. This new antibiotic consists of two units of homononactic acid linked to form a cyclic diester. An unknown...
Chakraborty, Debashis, Nagarajan, Shantha, Aggarwal, Pramila, Gupta, V.K., Tomar, R.K., Garg, R.N., ...
Mulching is one of the important agronomic practices in conserving the soil moisture and modifying the soil physical environment. Wheat, the second most important cereal crop in India, is sensitive...
Intervention analysis with nonlinear dependent noise variation
Investigations of nonlinear fittings in combination with interventions have not been found in the literature so far. Because of the complexities of the procedures and intractability of the model...
Scaling Analysis on Indian Foreign Exchange Market
In this paper we investigate the scaling behavior of the average daily exchange rate returns of the Indian Rupee against four foreign currencies namely US Dollar, Euro, Great Britain Pound and...
Sarkar, A., Basak, R., Bishayee, A., Basak, J., Chatterjee, M.
Beta-carotene (BC) has recently been found to possess potent anti-tumour activity in chemically induced rat liver carcinogenesis. In the present study, attempts have been made to understand the basic...