Tumkur University was established in 2004 in Tumkur, Karnataka, India. It was carved out of Bangalore University to accommodate the needs of the students from Tumkur district. Established under the Karnataka State Universities Act, 2000, as a multi-faculty university, it has 12 postgraduate departments, 2 constituent colleges and 94 affiliated colleges. It has established 29 research centres to promote advanced multi-disciplinary research and academic collaborations. In 2012, the University was recognized under section 12 of the UGC Act, 1956. In the same year, the National Assessment and Accreditation Council , an inter-university council of the UGC, accredited the University with "B" Grade in the three-grade rating scale. Wikipedia.
Vidya Y.S.,LBSGFGC |
Anantharaju K.S.,East-West Center |
Nagabhushana H.,Tumkur University |
Sharma S.C.,Chhattisgarh Swami Vivekananda Technical University
Journal of Alloys and Compounds | Year: 2014
Eco-friendly, cost effective and bio template route was used for the preparation of cubic Gd2O3:Eu3+ nanophosphors using Euphorbia tirucalli (E. tirucalli) plant latex as fuel. As - formed Gd2O3:Eu3+ (7 mol%, 1-7 ml), calcined Gd2O3:Eu3+ (7 mol%, 1-7 ml) and Gd2O3:Eu3+ (1-11 mol%, 7 ml) samples were characterized using XRD, SEM and UV-Vis absorption spectrophotometer. With increase in latex concentration, the nanophosphor gets transformed from nano plates to rose - like nanoflowers with size varying from 20 to 30 nm. X-ray diffraction pattern of as - formed product shows hexagonal Gd (OH)3: Eu3+ phase and it converts to pure cubic phase of Gd2O3:Eu3+ on calcination at 600 °C for 3 h. Rietveld refinement of Gd2O3:Eu3+ (7 mol%, 7 ml) revealed the presence of cations in the 8b (0.25, 0.25, 0. 25) and 24d positions (-0.0287, 0.00, 0. 25) and the anions in the 48e positions (0.39, 0.15, 0. 37) with space group Ia-3(206). The photoluminescence intensities of transitions between different J levels depend on the symmetry of the local environment of Eu3+ ion activators and the high ratio of intensity of (5D0 → 7F2) and (5D0 → 7F1) provides the conclusion that Eu3+ ion occupies sites with a low symmetry and without an inversion centre. The chromaticity and the CIE coordinates were very close to the standard red color region. The absorption observed in the excitation spectra shows the suitability of the nanophosphor obtained in this study for getting excited in UV, NUV and visible regions for variety of display applications. Further, the Gd2O3:Eu3+ (7 mol%, 1-7 ml) samples were experimented towards the photocatalytic behavior on Congo red (CR) and correlated with emission of PL intensity. The decolorization of dye was found to decreased from 83 to 54% with increase in the plant latex concentration. © 2014 Elsevier B.V. All rights reserved.
Sampath Kumar B.T.,Tumkur University |
Manoj Kumar K.S.,Library and Information Center
Aslib Proceedings: New Information Perspectives | Year: 2012
Purpose: The main purpose of the present study is to examine the availability and persistence of URL citations in two LIS open access journals. It also intended to calculate the half-life period of URL citations cited in journal articles. Design/methodology/approach: A total of 2,890 URL citations cited in 689 research articles published in LIS journals spanning a period of 14 years (1996-2009) were extracted. In order to check the accessibility of URL citations, W3C link checker was used. After the initial check, inactive URL citations were listed. Domains and HTTP errors associated with inactive URL citations were identified for further analysis. The half-life period was calculated using the formula t(h)=[t ln(0.5)]/[ln W(t)-ln W(0)]. Findings: The research findings indicated that 57.61 percent (397 of 689) of articles have URL citations and percentage of URL citations increased from 5.98 percent in 1996 to 27.79 percent in 2009. It was found that 26.08 percent of all citations were not accessible during the time of testing and the majority of errors were due to HTTP 404 error code (not found). The domains.net and.gov were more stable compared to the domains.com/.co,.org, and.edu. The half-life was computed to be approximately 11.5 years, which compares favorably against earlier research works. Originality/value: This is a comprehensive study on the availability and persistence of URL citations cited in LIS journals articles spanning a period of 14 years. The findings of the study will be helpful to authors, publishers and editorial staff to improve existing URL citation conventions and to promote URL use to ensure that URL citations are accessible in future. © Emerald Group Publishing Limited.
Suresh D.,Tumkur University |
Nagabhushana H.,Tumkur University |
Sharma S.C.,Chattisgarh Swami Vivekanand Technical University
Materials Letters | Year: 2015
The study reports a facile green method for the effective reduction of graphene oxide (GO) using Cloves (Syzygium aromaticum) extract by a reflux method at 100°C for 30 min. Formation of a few layered reduced graphene oxide (rGO) was confirmed by XRD, TEM and UV-visible studies. Carcinogenic dye degradation and antioxidant properties of the rGO were evaluated. Methylene blue (MB) and Malachite green (MG) dyes were found to be eliminated completely within 20 min in dark condition in the presence of 20 mg rGO. The prepared rGO was found to have IC50 value of 1337 μg/ml towards quenching of DPPH free radicals. The investigation describes an environment friendly and cost effective method for the green reduction of GO to attain multifunctional rGO. © 2014 Elsevier B.V. All rights reserved.
Shivalingaiah D.,Tumkur University |
Proceedings of 2012 International Conference on Cloud Computing Technologies, Applications and Management, ICCCTAM 2012 | Year: 2012
Universities and Colleges are the core of innovation through their advanced research and development. Higher education libraries of different size and type all over the world suffer from common problems such as shrinking budgets, accommodating resources within the budgetary constraints, Countering increased scope of interdisciplinary and multidisciplinary nature of subjects, flexibility associated with the e-data, diminished levels of efficiency, and huge cost involved in managing the entire IT infrastructure in the modern day academic libraries. Libraries are at the threshold of embracing the concept of cloud computing because of its both technological and economic advantages. Resource sharing, among the academic libraries through Cloud will in principle reduce the overall cost and increase the efficiency. It will also enhance the user experience and will help in making the libraries a lot more scalable. In this paper authors have made an attempt to discuss the types, applications, advantages and disadvantages of implementing cloud computing mainly for resource sharing in an academic library environment. The purpose of this article is to look specifically at how cloud computing can be employed by libraries and what are the potential areas need to be considered before moving into a cloud computing solution implementation. © 2012 IEEE.
Jogaiah S.,University of Mysore |
Jogaiah S.,Yamaguchi University |
Govind S.R.,Tumkur University |
Tran L.-S.P.,Yamaguchi University |
Critical Reviews in Biotechnology | Year: 2013
Economically important crops, such as maize, wheat, rice, barley, and other food crops are affected by even small changes in water potential at important growth stages. Developing a comprehensive understanding of host response to drought requires a global view of the complex mechanisms involved. Research on drought tolerance has generally been conducted using discipline-specific approaches. However, plant stress response is complex and interlinked to a point where discipline-specific approaches do not give a complete global analysis of all the interlinked mechanisms. Systems biology perspective is needed to understand genome-scale networks required for building long-lasting drought resistance. Network maps have been constructed by integrating multiple functional genomics data with both model plants, such as Arabidopsis thaliana, Lotus japonicus, and Medicago truncatula, and various food crops, such as rice and soybean. Useful functional genomics data have been obtained from genome-wide comparative transcriptome and proteome analyses of drought responses from different crops. This integrative approach used by many groups has led to identification of commonly regulated signaling pathways and genes following exposure to drought. Combination of functional genomics and systems biology is very useful for comparative analysis of other food crops and has the ability to develop stable food systems worldwide. In addition, studying desiccation tolerance in resurrection plants will unravel how combination of molecular genetic and metabolic processes interacts to produce a resurrection phenotype. Systems biology-based approaches have helped in understanding how these individual factors and mechanisms (biochemical, molecular, and metabolic) "interact" spatially and temporally. Signaling network maps of such interactions are needed that can be used to design better engineering strategies for improving drought tolerance of important crop species. © 2013 Informa Healthcare USA, Inc.
Ramesh T.N.,Tumkur University
Particuology | Year: 2012
The diffusion of ammonia vapors into a solution of aluminum nitrate or ferric nitrate results in the precipitation of their respective hydroxides and oxyhydroxides. Polymorphic phase formation of aluminum hydroxide is controlled by the rate of crystallization. The PXRD patterns of products obtained via vapor phase diffusion revealed that poorly ordered aluminum hydroxide is formed during the initial stages of crystallization. After 8 days, the formation of the bayerite phase of aluminum hydroxide was observed. Upon prolonged exposure to ammonia vapors, bayerite was transformed into gibbsite. The infrared spectrum of the product confirmed the presence of different polytypic phases of aluminum hydroxide. The results demonstrated that the crystal structure of metal hydroxides is controlled by the rate of crystallization, nature of the metal ion, site selectivity and specificity and preparative conditions. © 2011 Chinese Society of Particuology and Institute of Process Engineering, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.
Saraf R.,Indian Institute of Science |
Shivakumara C.,Indian Institute of Science |
Behera S.,Indian Institute of Science |
Dhananjaya N.,BMS College of Engineering |
Nagabhushana H.,Tumkur University
RSC Advances | Year: 2015
A series of Bi1-xEuxOX (X = F and Br; x = 0, 0.01, 0.03 and 0.05) phosphors were synthesized at relatively low temperature and short duration (500°C, 1 h). Rietveld refinement results verified that all the compounds were crystallized in the tetragonal structure with space group P4/nmm (no. 129). Photoluminescence spectra exhibit characteristic luminescence 5D0 → 7FJ (J = 0-4) intra-4f shell Eu3+ ion transitions. The magnetic dipole (5D0 → 7F1) transition dominates the emission of BiOF:Eu3+, while the electric dipole (5D0 → 7F2) peak was stronger in BiOBr:Eu3+ phosphors. The evaluated CIE color coordinates for Bi0.95Eu0.05OBr (0.632, 0.358) are close to the commercial Y2O3:Eu3+ (0.645, 0.347) and Y2O2S:Eu3+ (0.647, 0.343) red phosphors. Intensity parameters (Ω2, Ω4) and various radiative properties such as transition rates (A), branching ratios (β), stimulated emission cross-section (σe), gain bandwidth (σe × Δλeff) and optical gain (σe × τ) were calculated using the Judd-Ofelt theory. It was observed that BiOBr:Eu3+ phosphors have a long lifetime (τ) and better optical gain (σe × τ) as compared to reported Eu3+ doped materials. Furthermore, these compounds exhibit excellent photocatalytic activity for the degradation of rhodamine B dye under visible light irradiation. The determined radiative properties and photocatalytic results revealed that BiOBr:Eu3+ phosphors have potential applications in energy and environmental remedies, such as to develop red phosphors for white light-emitting diodes, red lasers and to remove toxic organic industrial effluents. © The Royal Society of Chemistry 2015.
Sampath Kumar B.T.,Tumkur University |
Vinay Kumar D.,Kuvempu University
Journal of Informetrics | Year: 2013
Study investigates the availability, persistence and half life of URL citations cited in two Indian LIS journals articles published between 2002 and 2010. This study also investigates how researchers can resurrect lapsed URL citations cited in research articles, using Wayback machine. A total of 1290 URLs cited in 472 research articles published in Indian LIS journals spanning a period of 9 years (2002-2010) were extracted. Study found that only 18.91% (1290 out of 6820) of URLs cited in these journal articles. 39.84% of URL citations were not accessible and remaining 60.15% of URL citations were still accessible. The HTTP 404 error message-" page not found" was the overwhelming message encountered and represented 54.86% of all HTTP error messages. However 51.06% URLs were recovered from HTTP 404 error message. Study also noticed that the half-life of URL citations was increased from 6.33 years to 13.85 years after recovering missing URLs from Wayback machine. © 2012 Elsevier Ltd.
Ramesh T.N.,Tumkur University
Inorganic Chemistry Communications | Year: 2011
Cobalt hydroxysalt exists in Co(OH)(NO 3), Co 2(OH) 3(NO 3), Co 3(OH) 4(NO 3) 2 and Co 7(OH) 12(NO 3) 2 compositions. Co 2(OH) 3(NO 3) has been prepared by varying the experimental conditions. The X-ray powder diffraction patterns of Co 2(OH) 3(NO 3) obtained by different methods exhibit significant changes in their peak positions and the relative intensities. Careful analysis of the X-ray powder diffraction patterns of Co 2(OH) 3(NO 3) samples reveals that it can crystallize in different polytypic modifications. The thermal decomposition studies show that the Co 2(OH) 3(NO 3) of 3R 2 polytype has better structural stability compared to Co 2(OH) 3(NO 3) of 1H polytype. © 2010 Elsevier B.V. All rights reserved.
Vyasanakere J.P.,Tumkur University |
Shenoy V.B.,Indian Institute of Science
Physical Review B - Condensed Matter and Materials Physics | Year: 2015
Fermi gases with generalized Rashba spin-orbit coupling induced by a synthetic gauge field have the potential of realizing many interesting states, such as rashbon condensates and topological phases. Here, we address the key open problem of the fluctuation theory of such systems and demonstrate that beyond-Gaussian effects are essential to capture the finite temperature physics of such systems. We obtain their phase diagram by constructing an approximate non-Gaussian theory. We conclusively establish that spin-orbit coupling can enhance the exponentially small transition temperature (Tc) of a weakly attracting superfluid to the order of the Fermi temperature, paving a pathway towards high Tc superfluids. © 2015 American Physical Society.