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Search Results: 1 - 10 of 5681 matches for " Sourav Singha Roy "
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A Review on Phylogenetic Analysis: A Journey through Modern Era  [PDF]
Sourav Singha Roy, Rakhi Dasgupta, Angshuman Bagchi
Computational Molecular Bioscience (CMB) , 2014, DOI: 10.4236/cmb.2014.43005
Abstract: Phylogenetic analysis may be considered to be a highly reliable and important bioinformatics tool. The importance of phylogenetic analysis lies in its simple manifestation and easy handling of data. The simple tree representation of the evolution makes the phylogenetic analysis easier to comprehend and represent as well. The varied applications of phylogenetics in different fields of biology make this analysis an absolute necessity. The different aspects of phylogenetic analysis have been described in a comprehensive manner. This review may be useful to those who would like to have a firsthand knowledge of phylogenetics.
International Journal of Engineering Science and Technology , 2011,
Abstract: In this paper a new hardware circuit has been proposed for evaluating value of a term in the form of xi easily,where x is the prime base and i is the exponent. Using greedy algorithm a large integer number can be represented by the multiplication of various prime numbers and each of the prime number may be in the form of xi . Without taking the general approach of multiplication for finding out the result of xi , the new and simple approach has been adopted. Certain pattern has been shown by detail study of the binary form of the prime basesand its exponent. Instead of multiply the prime base x with i times with itself, it can be possible to calculate the xi by performing simple logical shifts, addition or subtraction operations. Those operations are similar in nature. To calculate the exponent part, set of some similar operations have been performed repeatedly. The proposed circuit has been implemented by decoder, shift register, adder-subtractor, lookup table, counter and tri-state buffer. Exponent part of each of the prime base x has been computed by this common circuit by selecting appropriate similar type of operations by the help of the lookup table. Due to the fixed size of shift register and adder-subtractor, finite range of operations of the exponent of the corresponding prime base x has been computed with this proposed hardware circuit.
Quantitative Analysis of Photo-Thermal Stability of CdSe/CdS Core-Shell Nanocrystals
A. Singha,A. Roy
Physics , 2005, DOI: 10.1557/jmr.2006.0170
Abstract: We report here investigations on the instability in luminescence of bare (TOPO-stabilized) and CdS- capped CdSe particles under infrared radiation. During photo-thermal annealing the formation of oxide layers on the surfaces of the particles create defect states. Consequently there is a reduction in particle size. These two effects control the light output from the samples. We make a quantitative comparison of the stability of bare CdSe and core-shell type CdSe-CdS particles under photo-annealing. Using diffusion theory, we show that the volume of the oxide layer, adhered to the crystallites, play a dominant role in controlling the luminosity of the particles.
Nuclear Spins as Quantum Testbeds: Singlet States, Quantum Correlations, and Delayed-choice Experiments
Soumya Singha Roy
Physics , 2012,
Abstract: Nuclear Magnetic Resonance (NMR) forms a natural test-bed to perform quantum information processing (QIP) and has so far proven to be one of the most successful quantum information processors. The nuclear spins in a molecule treated as quantum bits or qubits which are the basic building blocks of a quantum computer. The development of NMR over half a century puts it in a platform where we can utilize its excellent control techniques over an ensemble of spin systems and perform quantum computation in a highly controlled way. Apart from a successful quantum information processor, NMR is also a highly powerful quantum platform where many of the potentially challenging quantum mechanical experiments can be performed.
International Journal of Engineering Science and Technology , 2011,
Abstract: In this paper the implementation and performance of a new unconventional selection operator for Genetic Algorithm have been emphasized. The operator has been tuned specifically to solve the Travelling Salesman Problem. The proposed Selection Operator has been utilized based on Sequential Constructive Crossover. Here the parent’s structure has been chosen as selection criteria of a chromosome to survive for the next generations. Also it is observed that how much the low cost gene sequences of its parent’s structure to optimize the fitness of individuals has been maintained .It has been shown experimentally that the better convergence to optimal andnear optimal solution compared to the traditional TSP with Conventional genetic operators has been achieved.
A spectroscopic study of the interaction of the antioxidant naringin with bovine serum albumin  [PDF]
Atanu Singha Roy, Debi Ranjan Tripathy, Angshuman Chatterjee, Swagata Dasgupta
Journal of Biophysical Chemistry (JBPC) , 2010, DOI: 10.4236/jbpc.2010.13017
Abstract: The interaction of naringin with bovine serum albumin has been performed using fluorescence, circular dichroism and fourier transform infrared spectroscopy in 20 mM phosphate buffer of pH 7.0 as well as molecular docking studies. The changes in enthalpy (ΔH°) and entropy (ΔS°) of the interaction were found to be +18.73 kJ/mol and +143.64 J mol-1 K-1 respectively, indicating that the interaction of naringin with bovine serum albumin occurred mainly through hydrophobic interactions. Negative values of free energy change (ΔG°) at different temperatures point toward the spontaneity of the interaction. Circular dichroism studies reveal that the helical content of bovine serum albumin decreased after interaction with naringin. According to the F?rster non-radiative energy transfer theory the distance between Trp 213 residue and naringin was found to be 3.25 nm. Displacement studies suggest that naringin binds to site 1 (subdomain IIA) of bovine serum albumin (BSA) which was also substantiated by molecular docking studies.
Shock Induced Symmetric Compression in a Spherical Target  [PDF]
Labakanta Mandal, Sourav Roy, Manoranjan Khan, R. Roychoudhury
Journal of Modern Physics (JMP) , 2015, DOI: 10.4236/jmp.2015.613178
Abstract: Shock induced symmetric compression has been studied in a spherical target. The shock induced interfacial radius will shrink and would reach a minimum point during implosion situation. However, after implosion the plasma tries to expand in blow off/explosion situation and as a result the interfacial radius will increase. Effects of plasma parameters like density and temperature have been studied numerically. It is seen that the density increases many times due to the mass conservation in imploding situation of a compressible shell like ICF. However, temperature will change rapidly due to change of inner density and so would be the pressure of compressible fluid following adiabatic law. Our analytical results agree qualitatively with those of simulation results in spherical geometry and also experimental observations conducted in cylindrical container.
International Journal on Computer Science and Engineering , 2012,
Abstract: Identify a human by his face is a very easy job for a human but it is most difficult job for a machine. These papers presenting some approaches for recognize a human face from skull. Then a totallynew conception is introduced here to recognize a person by the help of the lower jaw or mandible of that person. This Technique is developed first time in the field of image processing.
Journal of Applied Sciences in Environmental Sanitation , 2012,
Abstract: Biological diversity intrinsically pedals the functioning and stabilization of an ecosystem. Among faunal diversity herpetofaunal (amphibians and reptiles) checklist serve a major role which provide the information of productivity and community dynamics. The present study was carried out at Durgapur, West Bengal, India from August 2009 to July 2011 with the objective to register the seasonal diversity and abundance of herfetofauna in and around the industrial region with special reference to the anthropogenic interventions. Diverse habitat types were surveyed applying hand capture, opportunistic spotting, road kill analysis, call survey and acquiring information from local people. Present survey revealed the richness of the Durgapur industrial area in its herpetofaunal diversity where 9 species of amphibians and 24 species of reptiles were recorded in the study area with the highest abundance observed during the rainy season. Duttaphrynus melanostictus was the most common amphibian species to register while Mycrohyla ornata was the rarest. So far as the reptilian diversity is concerned only one species of turtle (Melanochelys trijuga), eight species of lizards and fifteen snake species were recorded. An overall negative anthropogenic influence on herpetofaunal diversity, distribution and abundance was evidenced from the present study and needs further investigation.
Multi Agent System Based Scheme for Revised National Tuberculosis Control Program
Shibakali Gupta,Sesa Singha Roy,Indrasish Bannerjee
Journal of Global Research in Computer Science , 2011,
Abstract: The rising prevalence of tuberculosis (TB) has economic repercussions not only for the patient’s family but also for the country. According to the survey conducted by World Health Organization (WHO), the Philippines ranks fourth in the world for the number of cases of tuberculosis and has the highest number of cases per head in Southeast Asia. Almost five million people are infected yearly by tuberculosis in our country. The rise in the occurrence of tuberculosis has been due to the low priority accorded to anti-tuberculosis activities by many countries. The unavailability of anti-TB drugs, insufficient laboratory networking, poor health infrastructures, including a lack of trained health personnel, have also contributed to the rise in the incidence of the disease. We start by reviewing the till date statistics of the tuberculosis effect worldwide as well as in India. Then we discuss about the programs undertaken worldwide for restraining the effect of TB, where we have given brief account of National TB Control Programme as well as the Revised National TB Control Programme (RNTCP) undertaken worldwide as well as in India. The rest of the paper deals with our main research work which deals with the development of an automated, intelligent, easy-to-use computerised system for an easy diagnosis of TB ,which is advantageous over the paper-pen based programmes undertaken. Our system is implemented using Multi Agent System.
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