518
20
11858
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https://archives.christuniversity.in/files/original/82d4205648a5d94aed265eb295a46796.pdf
c90bf4dabefdd2acc257dba9382f9e1d
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PhD
PhD Thesis
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Studies on single crystals and thin films on tin sulfide (SnS) for photovoltaic applications
Subject
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Physics
Description
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There is an increasing demand for renewable energy sources due to the limited availability of fossil, risk factor associated with nuclear fuel and due to growing environmental concern. Photovoltaic (PV) energy conversion has the potential to contribute significantly to the electrical energy of the main obstacles preventing production and application on a large scale. Availability of the materials and their processing cost are the two major constraints associated with the presently leading PV technologies. Hence, cost of the electricity produced by these technologies are not yet competitive compared to the electricity produced by conventional sources.
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Hegde, Shyamsunder - 0945204
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CHRIST (Deemed to be University)
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English
Type
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PhD
-
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Title
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Articles
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Studies on sulfur doping and figure of merit in vapor grown Sb2Te3 platelet crystals
Subject
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A1. Characterization; A1. Doping; A2. Growth from vapor; B2. Semiconducting materials
Description
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A series of p-type Sb2Te3-xSx(x=0, 0.1, 0.2, 0.3 and 0.4) samples for each sulfur composition was vapor deposited to explore the crystal growth mechanism of platelet morphology and to understand their potential use for thermoelectric devices. Structural characterization performed by X-ray diffraction exhibited consistent rhombohedral unit cell parameters for all the antimony telluride crystals with D3d5 space group symmetry. Scanning electron microscopy (SEM) and energy dispersive analysis by X-rays (EDAX) were employed for morphological and compositional studies. The Seebeck coefficient S (?c) of Sb2Te3-xSx crystals for sulfur composition, x=0.3 was remarkably improved, yielding a figure of merit (ZT)=0.54, which is ?2.5 fold rise compared to the melt grown Sb2Te3 crystals. The atomic force microscopic (AFM) imprints revealed that, with increasing content of dopant, distribution of etch pits and microhardness increased in sulfur doped crystals. By optimizing sulfur doping, the antisite (AS) defect formation can be suppressed for enhancing ZT and the results obtained enable to design novel thermoelectric materials for application in power generation and refrigeration. 2015 Elsevier B.V. All rights reserved.
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Thankamma G.; Kunjomana A.G.
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Journal of Crystal Growth, Vol-415, pp. 65-71.
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Elsevier
Date
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2015-01-01
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<a href="https://doi.org/10.1016/j.jcrysgro.2014.12.031" target="_blank" rel="noreferrer noopener">https://doi.org/10.1016/j.jcrysgro.2014.12.031</a>
<br /><br /><a href="https://www.scopus.com/inward/record.uri?eid=2-s2.0-84921373795&doi=10.1016%2Fj.jcrysgro.2014.12.031&partnerID=40&md5=45748e4b7e28bf322c2ba9d5b3439095" target="_blank" rel="noreferrer noopener">https://www.scopus.com/inward/record.uri?eid=2-s2.0-84921373795&doi=10.1016%2fj.jcrysgro.2014.12.031&partnerID=40&md5=45748e4b7e28bf322c2ba9d5b3439095</a>
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ISSN: 220248; CODEN: JCRGA
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Online
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English
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Article
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Thankamma G., Crystal Research Centre, Department of Physics, Christ University, Bangalore, 560029, India; Kunjomana A.G., Crystal Research Centre, Department of Physics, Christ University, Bangalore, 560029, India
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https://archives.christuniversity.in/files/original/5ca8421b9dfd1adac244713af8e52038.gif
e22a89ef3d6cbe9beaed771484fb1385
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Title
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Studies on sulfur doping and figure of merit in vapor grown Sb2Te3 platelet crystals /
Subject
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Physics
Description
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Journal Of Crystal Growth, Vol.412, pp.65-71, ISSN No: 0022-0248.
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George, Thankamma., Kunjomana, A G.
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<a href="https://www.sciencedirect.com/science/article/pii/S002202481400846X" target="_blank" title="Studies on sulfur doping and figure of merit in vapor grown Sb2Te3 platelet crystals" rel="noreferrer noopener">https://www.sciencedirect.com/science/article/pii/S002202481400846X</a>
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Elsevier
Date
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2015-02-10
Language
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English
Type
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Journal Article
-
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Title
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Articles
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Title
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Studies on Tensile Properties of Graphene Hydroxyl Reinforced Aluminium 6061 Composites for Vehicle Structures Applications
Subject
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Aluminium; Cohesive strength; Composites; Graphene hydroxyl; Vehicle structures
Description
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Aluminium composite plays a significant role in the mechanical structures. Low tensile strength of the aluminium alloy limits its application in mechanical structures. Graphene hydroxyl (GrOH) is a noble emerging material which is an allotropic form of carbon. It has high cohesive strength, good bonding ability with other materials. Carbon bonds processes high compatibility when it reinforced with other material. Reinforcement of GrOH with aluminium composites enhances the wear strength of composite material. This paper focused on analysis of tensile properties and percentage elongation of aluminium composites reinforced with GrOH with various weight percentage (wt. %). The characteristics of aluminium composites, particularly related to its tensile properties are very much important for its use in vehicle structures applications. 2022. MechAero Foundation for Technical Research & Education Excellence.
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Srinivasa M.R.; Rammohan Y.S.; Sadashiva M.; Yathish M.K.; Ramesha K.; Thomas S.
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International Journal of Vehicle Structures and Systems, Vol-14, No. 2, pp. 223-225.
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MechAero Found. for Techn. Res. and Educ. Excellence
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2022-01-01
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<a href="https://doi.org/10.4273/IJVSS.14.2.16" target="_blank" rel="noreferrer noopener">https://doi.org/10.4273/IJVSS.14.2.16</a>
<br /><br /><a href="https://www.scopus.com/inward/record.uri?eid=2-s2.0-85127979111&doi=10.4273%2FIJVSS.14.2.16&partnerID=40&md5=e1d632bdb5a6b0a79f1c4f29de319dec" target="_blank" rel="noreferrer noopener">https://www.scopus.com/inward/record.uri?eid=2-s2.0-85127979111&doi=10.4273%2fIJVSS.14.2.16&partnerID=40&md5=e1d632bdb5a6b0a79f1c4f29de319dec</a>
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ISSN: 9753060
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Online
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English
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Article
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Srinivasa M.R., Dept. of Mech. Engg., P.E.S. College of Engg, Karnataka, Mandya, India; Rammohan Y.S., Dept. of Industrial and Production Engg., P.E.S. College of Engg, Karnataka, Mandya, India; Sadashiva M., Dept. of Mech. Engg., P.E.S. College of Engg, Karnataka, Mandya, India; Yathish M.K., Dept. of Mech. Engg, B.M.S. College of Engg, Karnataka, Bengaluru, India; Ramesha K., Dept. of Mech. Engg., School of Engg. and Tech, CHRIST (Deemed to be University), Kengeri Campus, Karnataka, India; Thomas S., Dept. of Mech. Engg., School of Engg. and Tech, CHRIST (Deemed to be University), Kengeri Campus, Karnataka, India
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Title
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Articles
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Faculty Publications -Articles
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Studies on the antifungal activity of biotemplated gold nanoparticles over Candida albicans
Subject
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Antifungal activity; Candida albicans; Gold nanoparticles; Green synthesis; Micro dilution assay
Description
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Green synthesis and applications of gold nanoparticles are more fascinating research area due to their unique optical properties and high X-ray attenuation power. In this study, we have synthesized gold nanoparticles of uniform size (5 nm) with spherical shape. UVvis spectroscopy, Transmission Electron Microscopy and Atomic Force Microscopy were employed to characterize the synthesized gold nanoparticles. The biomedical applications of the synthesized gold nanoparticles were carried out against most prevalent human fungal pathogen, Candida albicans. Broth micro dilution assay was used to determine minimum inhibitory concentration (MIC). We observed that 0. 5 mM concentration was effective in inhibiting the growth of fungal cells which was later confirmed by spot assay. 2019 Elsevier Ltd
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M N.; D S.; Hans S.; Varghese A.; Fatima Z.; Hameed S.
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Materials Research Bulletin, Vol-119
Publisher
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Elsevier Ltd
Date
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2019-01-01
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<a href="https://doi.org/10.1016/j.materresbull.2019.110563" target="_blank" rel="noreferrer noopener">https://doi.org/10.1016/j.materresbull.2019.110563</a>
<br /><br /><a href="https://www.scopus.com/inward/record.uri?eid=2-s2.0-85070697782&doi=10.1016%2Fj.materresbull.2019.110563&partnerID=40&md5=6415a076951b1c3cf5d297e4427edab6" target="_blank" rel="noreferrer noopener">https://www.scopus.com/inward/record.uri?eid=2-s2.0-85070697782&doi=10.1016%2fj.materresbull.2019.110563&partnerID=40&md5=6415a076951b1c3cf5d297e4427edab6</a>
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ISSN: 255408; CODEN: MRBUA
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Online
Language
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English
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Article
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M N., Department of Chemistry, CHRIST (Deemed to be University), Bengaluru, 560029, Karnataka, India; D S., Department of Chemistry, Amity School of Applied Sciences, Amity University Haryana Amity Education Valley, Gurgaon, 122413, Haryana, India; Hans S., Amity Institute of Biotechnology, Amity University Haryana, Amity Education Valley, Gurgaon, 122413, Haryana, India; Varghese A., Department of Chemistry, CHRIST (Deemed to be University), Bengaluru, 560029, Karnataka, India; Fatima Z., Amity Institute of Biotechnology, Amity University Haryana, Amity Education Valley, Gurgaon, 122413, Haryana, India; Hameed S., Amity Institute of Biotechnology, Amity University Haryana, Amity Education Valley, Gurgaon, 122413, Haryana, India
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Studies on the characterisation of thiophene substituted 1,3,4-oxadiazole derivative for the highly selective and sensitive detection of picric acid
Subject
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1,3,4-oxadiazole; Binding constant; Fluorescence quenching; Nitrated explosives or nitroaromatic compounds; Picric acid
Description
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A novel thiophene substituted 1,3,4-oxadiazole based chemosensor namely 2-(4-(5-(5-hexylthiophen-2-yl) thiophen-2-yl)phenyl) -5-(5-(5-(5-hexylthiophen-2-yl) thiophen-2-yl)thiophen-2-yl)-1,3,4-oxadiazole [TKO] has been characterised for the efficient detection of picric acid (PA) based on fluorescence quenching mechanism. In this regard, the electronic absorption spectra, fluorescence spectra, and fluorescence lifetime of TKO are recorded in the presence of different nitroaromatic compounds (NACs) in ethanol at room temperature. The absorption studies exhibited a blue shift in the absorption maxima with the increase in the concentration of PA. In the fluorescence titration studies, TKO shows a remarkable fluorescence quenching with picric acid as compared to other nitroaromatic compounds. Using the Benesi-Hildebrand plot, the binding constant value of PA with TKO is determined and is of the order of 6.467 104 M?1. Job's plot analysis confirms the 1:1 binding stoichiometry ratio between TKO and PA and is supported by the 1H NMR studies. The detection limit is determined and is of the order of 10.08 M. The competitive studies revealed that TKO is highly selective for recognizing PA without the interference of other NACs. The theoretical studies were also carried out to understand the binding mechanisms of PA with TKO. The fluorescence quenching of TKO by PA may be attributed to photo induced electron transfer (PET). Overall, the experimental findings suggest that, the novel probe TKO may be used as a highly selective and sensitive chemosensor for the detection of explosives like picric acid. 2022 Elsevier B.V.
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Thippeswamy M.S.; Naik L.; Maridevarmath C.V.; Savanur H.M.; Malimath G.H.
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Journal of Molecular Structure, Vol-1264
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Elsevier B.V.
Date
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2022-01-01
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<a href="https://doi.org/10.1016/j.molstruc.2022.133274" target="_blank" rel="noreferrer noopener">https://doi.org/10.1016/j.molstruc.2022.133274</a>
<br /><br /><a href="https://www.scopus.com/inward/record.uri?eid=2-s2.0-85130194990&doi=10.1016%2Fj.molstruc.2022.133274&partnerID=40&md5=f5c0123e50075c72a50f77b4ffe0e2b8" target="_blank" rel="noreferrer noopener">https://www.scopus.com/inward/record.uri?eid=2-s2.0-85130194990&doi=10.1016%2fj.molstruc.2022.133274&partnerID=40&md5=f5c0123e50075c72a50f77b4ffe0e2b8</a>
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ISSN: 222860; CODEN: JMOSB
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Online
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English
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Article
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Thippeswamy M.S., UG and PG Department of Physics, Karnatak Science College, Karnataka, Dharwad, 580001, India; Naik L., Department of Physics and Electronics, CHRIST (Deemed to be University), Bangalore Central Campus, Karnataka, Bengaluru, 560029, India; Maridevarmath C.V., Department of Physics, Government First Grade College, Karnataka, Hubballi, 580032, India; Savanur H.M., Department of Chemistry, P.C. Jabin, Science College, Karnataka, Hubballi, India; Malimath G.H., UG and PG Department of Physics, Karnatak Science College, Karnataka, Dharwad, 580001, India
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PHD
PhD
PhD Thesis
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61000435
Title
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Studies on the Culture Conditions, Nutritional Value of the Black Soldier Fly, Hermetia illucens (Diptera : Stratiomyid) and its Suitability as Aquaculture Feed
Subject
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Life Sciences
Description
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The Black Soldier Fly (BSF), Hermetia illucens, has emerged as a promising newlinesolution in aquaculture due to its remarkable ability to convert organic waste into newlineprotein-rich biomass. This has garnered interest among aquaculturists seeking costeffective and sustainable alternative ingredients for aqua feed. However, fully newlineharnessing the potential of this insect requires a deeper understanding of its life cycle and nutritional composition. A key challenge in utilising BSF larvae (BSFL) for newlineaquafeed production is the lack of standardized culture systems. This study addresses this gap by establishing a comprehensive culture system using two common organic wastes, fruit waste (FW) and vegetable waste (VW), as rearing substrates. By evaluating the growth performance of BSFL reared on these substrates, the research sheds light on optimal conditions for large-scale BSF production. The study investigated the impact of FW and VW substrates on BSFL growth through a thorough analysis of growth performance, morphometric measurements and newlineScanning Electron Microscopy (SEM). Results showed that BSFL reared on FW exhibited better growth (40 days) than those reared on VW (46 days). Morphometric analysis and SEM identified five larval stages and the prepupa, pupa, and adult stages. Additionally, the study analysed the nutritional composition of BSFL at different newlinedevelopmental stages, such as Instar 3 through instar 5, prepupa and pupa, including newlineprotein, carbohydrate, lipid, amino acids and fatty acids. This provided insights into newlinehow variations in substrate impact the nutritional quality of BSFL at different stages, which is crucial for ensuring that BSFL-derived feed meets the dietary requirements of target aquaculture species. Significant differences were found in the proximate composition of the substrates (FW and VW), resulting in significant variations in BSFL nutrition. BSFL reared on FW exhibited higher nutritional content especially crude newlineprotein (54.160.64%), than those reared on VW, except for crude lipids (2.200.01%).
Creator
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Subhashini, R M
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Author's Submission
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Christ(Deemed to be University)
Date
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2024-01-01
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V, Krishnakumar
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Open Access
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PDF
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English
Type
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PhD
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<a href="http://hdl.handle.net/10603/615084" target="_blank" rel="noreferrer noopener">http://hdl.handle.net/10603/615084</a>
-
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Title
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PHD
PhD
PhD Thesis
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61000207
Title
A name given to the resource
Studies on the Fresh Water Algal Floria in Chimmony Wildlife Sanctuary
Subject
The topic of the resource
Life Sciences
Description
An account of the resource
Algae is a crucial organism in the environment. They help in maintaining the balance among different ecosystems. According to the geography and climatic conditions, newlineKerala has a suitable environment for algal growth. However, the algal biodiversity newlinestudies conducted in Kerala are significantly less. The wildlife sanctuary comprises a newlineconsiderable scope for algal biodiversity. The Chimmony wildlife sanctuary is situated in Mukundapuram taluk of Thrissur district. It spreads over 85.067 km2 with a water spread area of 10.1 km2. Ten different sampling stations were selected across newlinethe wildlife sanctuary, and extensive field visits were conducted to identify and newlinedocument the algae with respect to three seasons (pre-monsoon, monsoon, and post- newlinemonsoon). The physicochemical parameters of water like dissolved oxygen, temperature, pH, alkalinity, total dissolved solids, light intensity, and rainfall amount were estimated seasonally. In this present study, a total of 121 taxa belonging to 60 genera, 38 families, 24 orders, and 5 classes, namely Chlorophyceae, Bacillariophyceae, Euglenineae, Rhodophyceae, and Cyanophyceae, were identified from 10 different stations. The Bacillariophyceae and Chlorophyceae were the most dominant class in the study area. The algal multiplication will be more in the pre monsoon season and it was observed that the Chlorophyceaen members were dominant, while the Bacillariophyceae were dominant during the post-monsoon season. Cyanophyceae was dominant only during the monsoon season because of its sensitivity toward light. The ANOVA (Two-way) analysis showed no significant difference between stations, and there is a considerable difference between seasons for dissolved oxygen, alkalinity, temperature, and total dissolved solids. While pH, showed no significant difference between seasons and stations, light intensity showed a substantial difference between stations and seasons. The temperature and dissolved oxygen showed a negative correlation.
Creator
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Jose, Joel.
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Author's Submission
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Christ(Deemed to be University)
Date
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2022-01-01
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Xavier, Jobi.
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Open Access
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PDF
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English
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PhD
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<a href="http://hdl.handle.net/10603/443994" target="_blank" rel="noreferrer noopener">http://hdl.handle.net/10603/443994</a>
-
https://archives.christuniversity.in/files/original/5708f4cb86536af4d963be45b111e8be.pdf
a88560976b4de7336dfe9dcd75107b6e
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Studies on thermal, structural, electrical and optical properties of Se-Te-Sb chalcogenide glasses /
Subject
The topic of the resource
Physics
Description
An account of the resource
Glasses, an intriguing state of matter, known to mankind since ages, have seen systematically reported investigations only in the 20th century. Of the various kinds of glasses such as silicates, oxides, halides, chalcogenide etc., a large spectrum of commercial and technological applications of chalcogenide glasses(ChG), have made them a subject of great interest and studied for more than four decades now.
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M K, Vanitha - 0945205
Publisher
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CHRIST (Deemed to be University)
Language
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English
Type
The nature or genre of the resource
PhD
-
Dublin Core
The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/.
Title
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PHD
PhD
PhD Thesis
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61000010
Title
A name given to the resource
Studies On Thermal,Structural,Electrical and Optical Properties of Se-Te-Sb Chalcogenide Glasses
Subject
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Physics and Electronics
Description
An account of the resource
NA
Creator
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Vanitha, M K.
Source
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Author's Submission
Publisher
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Christ(Deemed to be University)
Date
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2012-01-01
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Hanumantha Rao, M V.
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Open Access
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PDF
Language
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English
Type
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PhD
Identifier
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<a href="http://hdl.handle.net/10603/365041" target="_blank" rel="noreferrer noopener">http://hdl.handle.net/10603/365041</a>
-
Dublin Core
The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/.
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Articles
Article
Faculty Publications -Articles
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Title
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Studies on Uniaxial Compressive Strength of Laterite Masonry Prisms
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Department of Civil Engineering
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Vol-04, No.02, April ISNN: 0974-5904
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Sujatha Unnikrishnan
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Vol.04, N0.02, April, ISSN: 0974-5904
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International Journal of Earth Science and Engineering
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2011
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English
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Article
-
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Articles
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Study of 1s internal bremsstrahlung spectrum from 57Co
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Coincidence; Electron capture; End-point energy; Internal bremsstrahlung; Transition energy
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The internal bremsstrahlung contribution from the electron capture of 57Co has been measured in coincidence with K-X-ray of the residual atom. The end-point energy (EPE) is extracted from the data using the linearised Jauch plot. The transition energy obtained using the (EPE) is 842.7keV, which is close to the value given by Audi and Wapstra. The measured intensity and shape factor from 300 to 600keV are found to be in good agreement with the Glauber and Martin theory. 2002 Elsevier Science Ltd. All rights reserved.
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Raghavendra M.K.; Azeez S.; Ramaswamy C.R.; Umesh T.K.; Gowda R.
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Radiation Physics and Chemistry, Vol-64, No. 4, pp. 251-255.
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2002-01-01
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<a href="https://doi.org/10.1016/S0969-806X(01)00507-2" target="_blank" rel="noreferrer noopener">https://doi.org/10.1016/S0969-806X(01)00507-2</a>
<br /><br /><a href="https://www.scopus.com/inward/record.uri?eid=2-s2.0-0036238438&doi=10.1016%2FS0969-806X%2801%2900507-2&partnerID=40&md5=c84d691951b77ce0b34850f3047c5a4b" target="_blank" rel="noreferrer noopener">https://www.scopus.com/inward/record.uri?eid=2-s2.0-0036238438&doi=10.1016%2fS0969-806X%2801%2900507-2&partnerID=40&md5=c84d691951b77ce0b34850f3047c5a4b</a>
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ISSN: 0969806X; CODEN: RPCHD
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Online
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English
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Article
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Raghavendra M.K., Department of Physics, Bangalore University, Jnana Bharathi Campus, Bangalore 560 056, India; Azeez S., Department of Physics, Christ College, Bangalore 560 029, India; Ramaswamy C.R., Department of Physics, Bangalore University, Jnana Bharathi Campus, Bangalore 560 056, India; Umesh T.K., Department of Studies in Physics, University of Mysore, Manasagangothri, Mysore 570 006, India; Gowda R., Department of Studies in Physics, University of Mysore, Manasagangothri, Mysore 570 006, India
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Title
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Book Chapter
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Title
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Study of Bard-Marangoni Convection in a Microfluid with Coriolis Force
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Marangoni number; Micropolar fluid; Rayleigh number; Rotation; Taylor number
Description
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The convection of micro-structured fluid particles and the Coriolis force has been investigated in the problem. The eigenvalues are calculated for upper free velocity and adiabatic temperature boundary conditions and lower rigid velocity and isothermal temperature boundary conditions. The analysis is based on solving linear disturbance equations. The impact of different micropolar fluid variables and the Taylor number based on the convection has also been investigated. The study could observe that while the coupling and micropolar heat conduction parameters along with rotational parameters have a stabilizing effect, the couple stress parameter results in a destabilizing effect. The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.
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Baby R.
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Trends in Mathematics, Vol-Part F2357, pp. 367-378.
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Springer Science and Business Media Deutschland GmbH
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2024-01-01
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<a href="https://doi.org/10.1007/978-3-031-41420-6_33" target="_blank" rel="noreferrer noopener">https://doi.org/10.1007/978-3-031-41420-6_33</a>
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ISSN: 22970215
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Online
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English
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Book chapter
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Baby R., Department of Computational Sciences, CHRIST (Deemed to be University), Bangalore, India
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https://archives.christuniversity.in/files/original/64db7942bc0538a68ebeab4980ec7011.pdf
1abbb9bc79fccf2e274e3dd879065293
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Title
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MPHIL
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Mphil Thesis
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STUDY OF BOUND AND CONTINUUM STATE BETA DECAY RATES OF A FEW BARE NUCLEI
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SEKHAR ASWIN
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2010
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Physics
Description
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Beta decay is one of the most widely studied research problems in nuclear physics. There has been a growing interest in understanding the dynamics of beta decay transitions for many decades. Many research groups have invested a lot of time, money and effort in experiments as well as developing the theory for the same.
Lot of work was done using Fermis theory and huge amount of data is available in that domain of nuclear physics. But recently, standard model has gained a lot of attention in the eyes of theoretical nuclear physicists and particle physicists to understand nuclear transitions with more importance to gluons mixing and quark mixing by incorporating CKM matrix and PMNS matrix elements. Subsequently, the standard model theory is applied to beta decay to gain a better insight with the application of standard weak interaction Hamiltonian to compute decay rates. The half life and stability of these nuclei depends on decay rates. Also, it gives us an idea about the kind of transitions which happen and which dont.
Recent interest in comparison of two modes of beta decay namely, continuum and bound state for same mother and daughter set, paved way for a lot of interesting calculations by various research groups. It is exciting to understand as to how their differences are compared.
The aim of this work is to predict continuum and bound state beta decay rates using approach incorporating standard weak theory for some new transitions, which has not been done so far and also compare few decay rates with existing experimental values done by various groups all over the globe.
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Articles
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Faculty Publications -Articles
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Study of BrinkmanBard nanofluid convection with idealistic and realistic boundary conditions and by considering the effects of shape of nanoparticles
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enclosures; idealistic boundary condition; porous medium; realistic boundary condition; shape factor; single-phase model
Description
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This study deals with linear and weakly non-linear stability analyses of BrinkmanBard convection in nanoliquid-saturated porous enclosures. Water with a dilute concentration of molybdenum disulfide nanoparticles with 0.06 volume fraction and 30% glass fiber-reinforced polycarbonate as a porous medium with porosity 0.88 are considered to be a working medium. The analytical solution is obtained in the present study for idealistic and realistic boundary conditions, and their results are compared. An analytically intractable Lorenz model with quadratic nonlinearities is reduced to a tractable GinzburgLandau amplitude equation with cubic nonlinearity using the multiscale method. Nanoparticles with different shapesare considered in the study, and their effects on the onset and heat transfer are discussed in great detail graphically in the presence of other parameters arising in the problem. 2021 Wiley Periodicals LLC
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Siddheshwar P.G.; Veena B.N.
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Heat Transfer, Vol-50, No. 4, pp. 3948-3976.
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John Wiley and Sons Inc
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2021-01-01
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<a href="https://doi.org/10.1002/htj.22059" target="_blank" rel="noreferrer noopener">https://doi.org/10.1002/htj.22059</a>
<br /><br /><a href="https://www.scopus.com/inward/record.uri?eid=2-s2.0-85100007098&doi=10.1002%2Fhtj.22059&partnerID=40&md5=35980c6fb0269d9a90f1df014526d424" target="_blank" rel="noreferrer noopener">https://www.scopus.com/inward/record.uri?eid=2-s2.0-85100007098&doi=10.1002%2fhtj.22059&partnerID=40&md5=35980c6fb0269d9a90f1df014526d424</a>
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ISSN: 26884534
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Online
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English
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Article
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Siddheshwar P.G., Department of Mathematics, CHRIST (Deemed to be University), Bengaluru, Karnataka, India; Veena B.N., Department of Mathematics, M. S. Ramaiah Institute Of Technology, Bengaluru, Karnataka, India
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https://archives.christuniversity.in/files/original/51123b2a6f24b52be94c50cde0ee5409.pdf
2fdcd9a2f6603cba9b68196df7a0a687
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Title
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Thesis
PhD
PhD Thesis
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Title
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Study of buoyancy and surface tension driven convection in nanofluid
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Mathematics
Description
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This thesis presents a detail study of linear and non-linear analysis of buoyancy and surface tension driven convection in nanofluid. The linear Rayleigh-Bernard / Rayleigh-Bernard Marangoni convection in nanofluids in the presence of external constraints like mangnetic feild, rotation and internal heat generation is investigated.
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Bawa, Ritu - 1145301
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CHRIST (Deemed to be University)
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English
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PhD
-
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PHD
PhD
PhD Thesis
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61000036
Title
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Study of buoyancy and surface tension driven convention in nanaofluid
Subject
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Mathematics and Statistics
Description
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This thesis presents a detail study of linear and non-linear analysis of buoyancy and surface tension driven convection in nanofluid. The linear Rayleigh-Bard / Rayleigh- Bard Marangoni convection in nanofluids in the presence of external constraints like magnetic field, rotation and newlineinternal heat generation is investigated. The effect of temperature and volumetric concentration modulation of nanoparticles at the boundary and gravity modulation are studied on the onset of Rayleigh- Bard newlineconvection. The obtained results are discussed qualitatively and presented newlinegraphically. The problem discussed have important applications in the field of oceanography, geophysics, nuclear fuel, astrophysics, geothermal reservoirs, engineering and space situations with g-jitter connected with gravity simulation studies.Given the rising relevance of nanofluid application, we discuss four newlineproblems in this thesis whose detail summary is presented below: (i) LINEAR AND WEAKLY NON-LINEAR ANALYSIS OF GRAVITY MODULATION ON THE ONSET OF RAYLEIGH BARD CONVECTION IN NANOFLUID The effect of modulation of gravity or time-periodic body force on newlinethe onset of Rayleigh-Bard convection in nanofluid is studied using newlinelinear and non-linear analysis. The stability of the fluid layer heated from newlinebelow is analysed by considering time-periodic body acceleration. This newlinehappens generally in the vehicles and satellites associated with studies of newlinemicro gravity simulation. In order to study the effect of gravity modulation newlineon the system stability limit, linear and weakly non-linear analysis is performed. Normal mode technique and perturbation method is applied to study linear stability. The critical Rayleigh number and wave number is newlinecalculated by taking modulation of small amplitude. It is found that the critical thermal Rayleigh number can be increase or decrease by a massive amount depending upon the distribution of nanoparticles.In this thesis we considered bottom heavy distribution of nanoparticles.
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Bawa,Ritu
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Author's Submission
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Christ(Deemed to be University)
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2016-01-01
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Pranesh, S
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Open Access
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PDF
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English
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PhD
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<a href="http://hdl.handle.net/10603/342003" target="_blank" rel="noreferrer noopener">http://hdl.handle.net/10603/342003</a>
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Articles
Article
Faculty Publications -Articles
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Study of Candidate be Stars in the Magellanic Clouds using near-Infrared Photometry and Optical Spectroscopy
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Physics
Description
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Monthly Notices of the Royal Astronomical Society Vol. 421, Issue 4, pp. 3622-3640, ISSN No. 1365-2966
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Paul K T, Subramaniam A., Mathew B., Mennickent R E., and Sabogal B.
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Monthly Notices of the Royal Astronomical Society
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2012
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English
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Articles
Article
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Study of candidate Be stars in the Magellanic Clouds using near-infrared photometry and optical spectroscopy
Subject
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Circumstellar matter; Magellanic Clouds; Stars: emission-line, Be; Techniques: spectroscopic
Description
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Mennickent et al. and Sabogal et al. identified a large number of classical Be (CBe) candidates (?3500) in the Large and Small Magellanic Clouds (LMC and SMC) based on their photometric variability using the OGLEII data base. They classified these stars into four different groups based on the appearance of their variability. In order to refine and understand the nature of this large number of stars, we studied the infrared properties of the sample and the spectroscopic properties of a subsample. We cross-correlated the optical sample with the IRSF-MCPS catalogue to obtain the J, H, K s magnitudes of all the four types of stars (?2500) in the LMC and SMC. Spectra of 120 stars belonging to the types 1, 2 and 3 were analysed to study their spectral properties. Among the four types, the type 4 stars are the dominant group, with ?60 and ?65 per cent of the total sample in the LMC and SMC, respectively. The near-infrared (NIR) colour-colour diagrams suggest that the type 4 stars in the LMC have a subclass, which is not found in our Galaxy or in the SMC. This subclass is ?18 per cent of the type 4 sample. The main type 4 sample which is ?49 per cent of the total sample has NIR properties similar to the Galactic CBe stars and the SMC type 4 stars. Though the new subclass of type 4 stars have high E(B-V) ? 0.75, they are not located close to regions with high reddening. The type 3 stars (?6 per cent and 7.3 per cent in the LMC and SMC) are found to have large H? equivalent width (EW) in the SMC and some are found to have large NIR excess. This small fraction of stars are unlikely to be CBe stars. Three stars among the type 3 stars in the LMC are found to be double periodic variables. The type 2 stars are found in larger fraction in the SMC (?14.5 per cent), when compared to the LMC (?6 per cent). The spectroscopic and the NIR properties suggest that these could be CBe stars. The type 1 stars are relatively more in the LMC (?24 per cent) when compared to the SMC (?13 per cent). The SMC type 1 stars have relatively large H? EW and this class has properties similar to CBe stars. The spectroscopic sample of type 1 stars which show H? in emission and are confirmed as CBe stars are more abundant in the SMC by a factor of 2.6. If the effect of metallicity is to cause more CBe stars in the SMC, when compared to the LMC, then type 1, type 2 and type 4 stars follow this rule, with an enhancement of 2.6, 2.4 and 1.3, respectively. 2012 The Authors Monthly Notices of the Royal Astronomical Society 2012 RAS.
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Paul K.T.; Subramaniam A.; Mathew B.; Mennickent R.E.; Sabogal B.
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Monthly Notices of the Royal Astronomical Society, Vol-421, No. 4, pp. 3622-3640.
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2012-01-01
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<a href="https://doi.org/10.1111/j.1365-2966.2012.20591.x" target="_blank" rel="noreferrer noopener">https://doi.org/10.1111/j.1365-2966.2012.20591.x</a>
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All Open Access; Bronze Open Access; Green Open Access
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ISSN: 13652966; CODEN: MNRAA
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Online
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English
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Article
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Paul K.T., Department of Physics, Christ University, Bangalore 560029, Karnataka, India; Subramaniam A., Indian Institute of Astrophysics, II Block Koramangala, Bangalore 560034, Karnataka, India; Mathew B., Indian Institute of Astrophysics, II Block Koramangala, Bangalore 560034, Karnataka, India, Astronomy and Astrophysics Division, Physical Research Laboratory, Ahmedabad, Gujarat, India; Mennickent R.E., Department of Astronomy, University of Concepcion, Concepcion, Chile; Sabogal B., Departamento de Fica, Universidad de los Andes, Edificio Ip, Bogot Cra. 1 No. 18A-10, Colombia
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Articles
Article
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Study of chaos in the Darcy-Bard convection problem with Robin boundary condition on the upper surface
Description
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Possibility of chaos is studied in Darcy-Bard convection using the Dirichlet and the Robin boundary condition at the lower and upper boundaries, respectively. Comparison is made with the results of Dirichlet (classical-Darcy-Bard convection, CDBC) and Neumann boundary condition (Barletta-Darcy-Bard convection, BDBC). It is found that the cell size at onset is bigger in the case of BDBC compared to the generalized-Darcy-Bard convection (GDBC) and much bigger compared to CDBC. The critical-Darcy-Rayleigh number of BDBC is found to be the least and that of CDBC is the largest. Nonlinear-stability-analysis is performed leading to the scaled-generalized-Vadasz-Lorenz model (SGVLM). In deriving this model, help is sought from a local-nonlinear-stability-analysis that yields the form of the convective-mode. The SGVLM is shown to be dissipative and conservative, with its bounded solution trapped within an ellipsoid. Onset of chaos and its characteristics are studied using the Hopf-Rayleigh-number, the Lorenz-butterfly-diagram, and the plot of the amplitude of the convective-mode vs the control-parameter, R, which is the eigenvalue. Chaos sets in earlier in CDBC and much later in BDBC when compared to that in GDBC. Beyond the onset of chaos is seen a sequence of chaotic and periodic motions, with the latter sometimes being present for an extended period. 2024 Author(s).
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Siddheshwar P.G.; Soibam D.D.; Laroze D.
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Physics of Fluids, Vol-36, No. 1
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American Institute of Physics Inc.
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2024-01-01
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<a href="https://doi.org/10.1063/5.0180488" target="_blank" rel="noreferrer noopener">https://doi.org/10.1063/5.0180488</a>
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All Open Access; Bronze Open Access
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ISSN: 10706631; CODEN: PHFLE
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Online
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English
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Article
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Siddheshwar P.G., Centre for Mathematical Needs, Department of Mathematics, CHRIST (Deemed to be University), Bengaluru, 560029, India; Soibam D.D., Centre for Mathematical Needs, Department of Mathematics, CHRIST (Deemed to be University), Bengaluru, 560029, India; Laroze D., Instituto de Alta Investigaci, Universidad de Tarapac Casilla 7 D, Arica, Chile