Deepa H.R.,BNM Institute of Technology |
Thipperudrappa J.,BNM Institute of Technology |
Suresh Kumar H.M.,Siddaganga Institute of Technology
Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy | Year: 2013
The absorption and fluorescence spectra of 6,7,8,9-tetrahydro-6,8,9- trimethyl-4-(trifluoro methyl)-2H-pyrano[2,3-b][1,8]naphthyridin-2-one (LD-489) and 1,2,3,8-tetrahydro-1,2,3,3,8-pentamethyl-5-(trifluoromethyl)-7H-pyrrolo[3,2- g]quinolin-7-one (LD-473) have been recorded at room temperature in different solvents and 1,4-dioxane-acetonitrile solvent mixtures. The UV-Visible absorption spectra are less sensitive to solvent polarity than the corresponding fluorescence spectra in both the dyes which show pronounced solvatochromic effect. The effects of solvents upon the spectral properties are analyzed using Lippert-Mataga polarity function, Richardts microscopic solvent polarity parameter and Catalán's multiple linear regression approach. Both general solute-solvent interactions and specific interactions are operative in these systems. The solvatochromic correlations are used to estimate excited state dipole moments using experimentally determined ground state dipole moments. The excited state dipole moment for both the dyes are found to be larger than their corresponding ground state dipole moment and is interpreted based on their resonance structures. © 2013 Elsevier B.V. All rights reserved.
Grid circuit design using S.A.N.DY for a battery pack: Switching Algorithm and cell DYnamics (S.A.N.DY), a novel approach for optimum discharging/charging of a lithium-polymer battery pack for hybrid/electric vehicles
Mishra J.,Siddaganga Institute of Technology
Electrical Systems for Aircraft, Railway and Ship Propulsion, ESARS | Year: 2015
This paper suggests an Intelligent Control Algorithm for optimizing the charge and discharge of a battery pack used in a hybrid/electric vehicle. With precision control of voltage and current levels in secondary batteries, high performance and greater battery life can be achieved and the problems of overcharging and over discharging in batteries can be avoided. It uses cell isolation system, which controls the number of cells required specifically for an instantaneous load condition, thus reducing the overall internal resistance of battery pack, hence reduces losses due to heating. © 2015 IEEE.
Mishra J.,Siddaganga Institute of Technology
SAE Technical Papers | Year: 2016
This paper suggests an Intelligent Control Algorithm for optimizing the charge and discharge of a battery pack used in a hybrid/electric vehicle. With precision control of voltage and current levels in secondary batteries, high performance and greater battery life can be achieved and the problems of overcharging and over discharging in batteries can be avoided. It uses cell isolation system, which controls the number of cells required specifically for an instantaneous load condition, thus reducing the overall internal resistance of battery pack, hence reduces losses due to heating. Copyright © 2016 SAE International.
Harish K.V.,Clemson University |
Dattatreya J.K.,Siddaganga Institute of Technology |
Neelamegam M.,Anna University
Construction and Building Materials | Year: 2013
In this study, conventional materials were used to prepare ultra-high strength mortars (UHSMs) and their stress-strain (σ-ε) characteristics in compression were investigated both experimentally and analytically. The effect of micro-fiber addition on the peak stress, peak strain, modulus of elasticity and energy absorption were then studied. Test results suggested that heat-treated UHSMs showed significantly higher strengths than non-heat-treated UHSMs. The micro-fiber addition significantly improved all the characteristics of UHSM. Both linear and non-linear correlations existed between the reinforcement indices of fibers and σ-ε characteristics of UHSM. The analytical modeling of the σ-ε curve showed good correlation with the experimental data. © 2013 Elsevier Ltd. All rights reserved.
Mallikarjuna C.,Al Jabal Al Garbhi University |
Shashidhara S.M.,Kalpataru Institute of Technology |
Mallik U.S.,Siddaganga Institute of Technology |
Parashivamurthy K.I.,Siddaganga Institute of Technology
Materials and Design | Year: 2011
A salt base exothermic reaction process has been employed to produce aluminum alloy 2014 matrix-TiB2 composites using an exothermic reaction process at 850°C using K2TiF6 and KBF4 salts. The period of exothermic reaction was varied from a minimum of 15min to a maximum of 45min to investigate the relationship between the degree of reaction and the growth behavior of TiB2 formed. These have been compared with commercially available aluminum alloy 2014 material. Structural and wear properties have been measured. These show that TiB2 is extremely effective in enhancing wear properties in addition to significantly reducing the coefficient of friction. The microstructure and phase composition of the materials obtained were studied using X-ray diffraction and scanning electron microscopy (SEM). Very fine ceramic particles were obtained in the aluminum alloy matrix. © 2011.