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Roy B.,Tripura Institute of Technology | Dasgupta R.,National Institute of Technical Teachers Training and Research | Chaki N.,University of Calcutta
Advances in Intelligent Systems and Computing | Year: 2016

In recent years, despite several risk management models proposed by different researchers, software projects still have a high degree of failures. Improper risk assessment during software development was the major reason behind these unsuccessful projects as risk analysis was done on overall projects. This work attempts in identifying key risk factors and risk types for each of the development phases of SDLC, which would help in identifying the risks at a much early stage of development. © Springer India 2016.

Koch A.,North - Eastern Hill University | Kumar A.,University of the West Indies | De A.K.,Tripura Institute of Technology | Phukan A.,North - Eastern Hill University | Lal R.A.,North - Eastern Hill University
Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy | Year: 2014

Three new homotrinuclear copper(II) complexes [Cu3(slmh)(μ- Cl)2(CH3OH)3]·0.5CH3OH (1), [Cu3(slmh)(NO3)2(CH3OH) 5]·1.5CH3OH (2) and [Cu3(slmh)(μ- ClO4)2(CH3OH)3]·2CH 3OH (3) from disalicylaldehyde malonoyldihydrazone have been synthesized and characterized. The composition of the complexes has been established on the basis of data obtained from analytical and thermoanalytical data. The structure of the complexes has been discussed in the light of molar conductance, electronic, FT-IR and far-IR spectral data, magnetic moment and EPR spectral studies. The molar conductance values for the complexes in DMSO solution indicate that all of them are non-electrolyte. The magnetic moment values for the complexes suggest considerable metal-metal intramolecular interaction between metal ions in the structural unit of the complexes. The EPR spectral features reveal that at RT, the ground state for the complexes is a mixture of the quartet state (S = 3/2) and doublet state (S = ½). At lower temperature, the ground state for the complexes is dx 2-y2 with considerable contribution from dz2 orbital. Dihydrazone ligand is present in enol form in all of the complexes. The complexes have distorted square pyramidal stereochemistry. The electron transfer reactions of the complexes have been investigated by cyclic voltammetry. Hydrogen peroxide mediated oxidation of benzyl alcohol catalyzed by complex 1 has been studied. © 2014 Elsevier B.V. All rights reserved.

Deb T.,Tripura Institute of Technology | Pal S.K.,National Institute of Technology Agartala
Electronic Journal of Geotechnical Engineering | Year: 2012

For assessment of compaction characteristics of local silty clay soil-fly ash mixed samples, correlations have been established in this paper. Local silty-clay soil (collected from Agartala, Tripura, India), fly ash (collected from Kolaghat Thermal Power Plant, West Bengal, India) and soilfly ash mixes (with percentages of fly ash in the mix 10, 15, 20, 25 and 30% on dry weight basis), in total nineteen numbers of samples are considered. Geotechnical parameters like, specific gravity (G), maximum dry density (MDD), optimum moisture content (OMC) and initial void ratio (ei) on soil, fly ash and soil-fly ash mixes are found out based on the laboratory tests conducted. Correlations based on the regression analysis in the form of linear, logarithmic and power curves, linear, exponential, logarithmic and polynomial curves, and linear, logarithmic, polynomial and power curves are established to assess MDD as function of OMC, as function of G, and as function of ei respectively; correlations also established in the form of linear, exponential, logarithmic, polynomial and power curves to assess OMC as function of G. Correlations are validated by data of earlier researchers and verified by present data which were not used for development of these correlations. These empirical relationships would be helpful for preliminary estimation of MDD and OMC of samples. The value of the coefficient of determination (R2) is near about 1.00 for all the equations established. Errors in the 89.90% of predicted values, verified with the data of earlier studies and present data are less than 10% which show the efficiency of the relationships. © 2012 ejge.

Datta J.,Tripura Institute of Technology | Mishra U.,National Institute of Technology Agartala | Chakraborty S.,National Institute of Technology Agartala
Research Journal of Chemistry and Environment | Year: 2014

Adsorption is a surface phenomenon in which one substance is accumulated on the surface of the other. In the recent years adsorption has become a very effective method for the treatment of waste water. For the removal of heavy metals from the water the adsorption technique has proved to be a useful method. In the present study the comparison of adsorption characteristics of removing Cd(II) from wastewater by normal tea factory waste and activated tea factory waste is studied. The experiments were carried out by the batch process and the effect of the agitation rate, adsorbent dose and initial metal ion concentration is studied. The maximum efficiency of cadmium(II) removal attained was 86.2% for normal tea factory waste and 88.4% for activated tea factory waste. The study showed that the both Langmuir and Freundlich isotherm model can be fitted with the experimental results. The results are also described by pseudo first order, pseudo second order and Elovich model. The study showed the possibility of using normal tea factory waste as a low cost adsorbent for heavy metal removal comparing with activated tea waste.

Das S.,Tripura Institute of Technology | Ghoshal D.,National Institute of Technology Agartala
International Journal of Applied Engineering Research | Year: 2016

Fractal based digital image compression is a very specific technique in the field of color image compression. The method is best suited for irregular shape of image like snow bobs, clouds, flame of fire; tree leaves images, depending on the fact that parts of an image often resemble with other parts of the same image. Fractal coding has not been widely used because of its long encoding time and high computational complexity. This image compression has received much attention from the research community because of some desirable properties like resolution independence, fast decoding, and very competitive rate-distortion curves. Despite the advances made, the long computing times in the encoding phase still remain the main disadvantages of this technique. However, many solutions have been proposed for this problem, but there is not yet a standard for fractal coding. In this paper we proposed fractal coding based on equilateral triangle segmentation and apply graph-based image segmentation to fractal image compression, separating the initial image into many logic areas, and then encoding each area with fractal image compression method. Experimental results show that, compared with the typical approaches, proposed approach can accelerate the fractal coding speed on the premise of guaranteeing the decoded images quality. Proposed hybrid scheme incorporating fractal compression and speedup techniques have achieved high compression ratio compared to pure fractal compression. © 2016, Research India Publications.

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