Vivekananda Degree College

Bangalore, India

Vivekananda Degree College

Bangalore, India
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Manjunatha H.C.,Government College for Women | Chandrika B.M.,Shravana and 592 | Seenappa L.,Government College for Women | Hanumantharayappa C.,Vivekananda Degree College
International Journal of Nuclear Energy Science and Technology | Year: 2016

Gamma attenuation parameters such as mass attenuation coefficient, effective atomic numbers, electron density, buildup factor, and specific absorbed fraction of energy of tungsten copper alloys (CuW(50), CuW(55), CuW(60), CuW(65), CuW(70), CuW(75), CuW(80), CuW(85) and CuW(90)) are evaluated. G-P fitting method has been used to compute energy absorption build-up factor for a wide energy range (0.015-15 MeV). The computed absorption build-up factor is used to estimate specific absorbed fraction of energy. The thickness of the medium up to 10mm and with penetration depth up to 40 mean free paths is considered. The dependence of the specific absorbed fraction of energy on incident photon energy, penetration and the thickness of the medium has also been studied. These gamma attenuation parameters change with the energy. For a given alloy's Zeff, buildup factors and specific absorbed fraction of energy values are minimum for CuW(50) and maximum for CuW(90). The mass attenuation coefficients and electron density values for CuW(50) are higher than for CuW(90). The present study is useful in the selection of gamma shielding materials. © Copyright 2016 Inderscience Enterprises Ltd.

Manjunatha H.C.,Government College for Women | Seenappa L.,Government College for Women | Seenappa L.,Bharathiar University | Chandrika B.M.,Shravana and 592 | Hanumantharayappa C.,Vivekananda Degree College
Annals of Nuclear Energy | Year: 2017

We have studied the shielding properties of Barium compounds such as BaF2, BaI2, BaS, Ba3N2, BaSe and BaH2. The photon interaction parameters such as mass attenuation coefficient, linear attenuation coefficient, Half Value Layer (HVL), Tenth Value Layer (TVL), effective atomic number and electron density of different gamma energies such as 170Tm (0.084 MeV), 137Cs (0.662 MeV) and 60Co (1.170, 1.330 MeV) are measured in given barium compounds. The measured values agree well with the theory. The effective atomic numbers (Zeff) and electron density (Ne) of Barium compounds have been computed in the wide energy region 1 keV to 100 GeV. We have also computed energy absorption buildup factors for the same compounds. The mass attenuation coefficient and linear attenuation coefficient for Ba3N2 is higher than the BaF2, BaI2, BaS, BaSe and BaH2. Half Value Layer (HVL), Tenth Value Layer (HVL) and mean free path are lower for same compoung Ba3N2 than the BaF2, BaI2, BaS, BaSe and BaH2. The calculated energy absorption buildup factors also minimum for Ba3N2. Hence, among the studied barium compounds Ba3N2 is best material for X-ray and gamma shielding. © 2017 Elsevier Ltd

Sripathy L.,Vivekananda Degree College | Hariprasad B.N.,Vivekananda Degree College | Vinay G.,Vivekananda Degree College | Vinaykumar C.,Vivekananda Degree College | Venkatesh T.,St Johns Medical College
Rasayan Journal of Chemistry | Year: 2014

Awareness about the toxic effects of non-essential metals are still lacking in developing countries. Lead is one among them, which ranks second in the Agency for Toxic Substances and Disease Registry's top 20 lists of toxic metals.The more widespread environmental emissions of lead have been drastically reduced through the introduction of unleaded petrol. As a result, publicity about this common toxin has considerably diminished. However, there is still a problem from these sources in countries with less developed controls. Furthermore, there is still one source of lead regularly causing poisoning, namely colouring materials in printing and fluxes, on which this paper focuses. Lead poisoning has been known for centuries. Scientific studies of the harmful effects of lead exposure date to the 1700s. Lead concentrations of blood samples from printing industries in Rajajinagar were determined by meta-exchange reagent followed by Anodic Stripping Voltammetry. We have analyzed blood samples from 22 employees working in Flux and Printing press from Rajajinagar, the city of Bangalore to assess the feasibility of using the lead in solvents. Some of the solvents being used even now are known to contain this toxic metal at alarming levels. We have a list of persons who are quite often suffered from headaches and backaches. © 2014 RASĀYAN. All rights reserved.

Nagabhushana H.,Tumkur University | Nagabhushana B.M.,M.S. Ramaiah Institute of Technology | Madesh Kumar M.,Cambridge Institute of Technology | Chikkahanumantharayappa,Vivekananda Degree College | And 4 more authors.
Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy | Year: 2011

CaSiO3:Eu3+ (1-5 mol%) red emitting phosphors have been synthesized by a low-temperature solution combustion method. The phosphors have been well characterized by powder X-ray diffraction (PXRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and optical spectroscopy. PXRD patterns reveal monoclinic CaSiO3 phase can be obtained at 900 °C. The SEM micrographs show the crystallites with irregular shape, mostly angular. Upon 254 nm excitation, the phosphor show characteristic fluorescence 5D0 → 7F J (J = 0, 1, 2, 3, 4) of the Eu3+ ions. The electronic transition located at 614 nm corresponding to 5D0 → 7F2 of Eu3+ ions, which is stronger than the magnetic dipole transition located at 593 nm corresponding to 5D 0 → 7F1 of Eu3+ ions. Different pathways involved in emission process have been studied. Concentration quenching has been observed for Eu3+ concentration > 4 mol%. UV-visible absorption shows an intense band at 240 nm in undoped and 270 nm in Eu3+ doped CaSiO3 which is attributed to oxygen to silicon (O-Si) ligand-to-metal charge-transfer (LMCT) band in the SiO3 2- group. The optical energy band gap is widened with increase of Eu3+ ion dopant. © 2010 Elsevier B.V. All rights reserved.

Dey D.,Indian Institute of Science | Prakash V.,Shirdi Sai Engineering College | Chopra D.,Indian Institute of Science | Vasu,Vivekananda Degree College | Srinivas M.,Biocon
Journal of Chemical Crystallography | Year: 2014

Two nitro substituted ethyl (2E)-2-cyano-3-phenylprop-2-enoate with molecular formula C12H10N2O4 have been synthesized and characterized by single-crystal X-ray diffraction. These two structures assemble via weak C-H···O=C/O (nitro group), C-H···N, and π-π intermolecular interactions which contribute towards the stability of the crystal packing. The lattice energies have been calculated using the PIXEL approach. Furthermore, high level DFT + Disp calculations for comparison with the pairing energies obtained from PIXEL method have been performed. An analysis of Hirshfeld surfaces and fingerprint plots facilitates a comparison of intermolecular interactions, which are the key elements in building different supramolecular architectures. Graphical Abstract: The manuscript highlights the evaluation of molecular conformation and crystal packing in two nitro derivatives of ethyl (2E)-2-cyano-3-phenylprop-2-enoate. 1. Molecular conformation in the solid state and compared with that in the gas phase. 2. Vibrational frequency calculations using TURBOMOLE. 3. Lattice Energy calculations using PIXEL. 4. Hirshfeld surface analysis to investigate intermolecular calculations.[Figure not available: see fulltext.] © 2014 Springer Science+Business Media New York.

Darshan G.,Harvard Degree College | Vasu,Vivekananda Degree College | Chopra D.,Indian Institute of Science | Saravanan J.,JKK Nataraja Dental College and Hospital
Acta Crystallographica Section C: Crystal Structure Communications | Year: 2010

The title isomers, viz. the N-(3-methylphenyl)-, (I), and N-(2-methylphenyl)-, (II), derivatives, both C26H28N 2O4S, adopt an E configuration that places the thio-phene and trimeth-oxy-phenyl groups on opposite sides of the C = N double bond, providing a suitable orientation for formation of an intra-molecular N - H⋯N hydrogen bond. However, while the mol-ecule in (I) is close to being planar, the N-methyl-phenyl group in (II) is twisted significantly from the plane of the remainder of the mol-ecule. Both crystal structures are essentially layered and there are no inter-molecular N - H⋯O hydrogen bonds. Compound (I) has a significantly higher calculated density than (II) (1.340 cf 1.305 Mg m-3), indicating that the mol-ecular packing in the meta isomer is overall more efficient than that in the ortho isomer. © 2010 International Union of Crystallography.

Sharma P.,Jammu University | Anthal S.,Jammu University | Prakash V.,Shirdi Sai Engineering College | Vasu,Vivekananda degree College | And 2 more authors.
X-ray Structure Analysis Online | Year: 2014

The title compound, 2-cyano-N-cyclohexylacetamide, C9H14N20, crystallizes in the monoclinic space group P21/n with the following unit-cell parameters: a = 12.057(2), b = 4.7671(8), c = 16.327(4)å, β = 96.50(2)°, Z = 4. The crystal structure was elucidated by direct methods, and refined to a final R-value of 0.0765 for 1137 observed reflections. The cyclohexane ring adopts the chair conformation. Intermolecular hydrogen bonds of the type N-H.O and C-H.N have been observed. © The Japan Society for Analytical Chemistry.

Nayak S.K.,Indian Institute of Science | Venugopala K.N.,Indian Institute of Science | Chopra D.,Indian Institute of Science | Vasu,Vivekananda Degree College | Row T.N.G.,Indian Institute of Science
CrystEngComm | Year: 2010

The supramolecular structures of eight aryl protected ethyl-6-methyl-4- phenyl-2-thioxo-1,2,3,4-tetrahydropyrimidine-5-carboxylates were analyzed in order to understand the effect of variations in functional groups on molecular geometry, conformation and packing of molecules in the crystalline lattice. It is observed that the existence of a short intra-molecular C-H⋯π interaction between the aromatic hydrogen of the aryl ring with the isolated double bond of the six-membered tetrahydropyrimidine ring is a key feature which imparts additional stability to the molecular conformation in the solid state. The compounds pack via the cooperative involvement of both N-H⋯SZC and N-H⋯OZC intermolecular dimers forming a sheet like structure. In addition, weak C-H⋯O and C-H⋯π intermolecular interactions provide additional stability to the crystal packing. © 2010 The Royal Society of Chemistry.

Sripathy L.,Vivekananda Degree College | Rao P.,Vivekananda Degree College | Ajay Kumar N.M.,Vivekananda Degree College | Yashwanth S.,Vivekananda Degree College | And 2 more authors.
Rasayan Journal of Chemistry | Year: 2015

Contamination of roadside soil and farmland with heavy metals due to traffic activities is an environmental hazard causing pollution, thereby affecting the eco-system. The present study is aimed to determine the impact of vehicular activity on soil and farmlands abetting the National highway 4 from Nelamangala to Dabaspet in the periphery of Bangalore city with contrasting traffic densities. The concentrations of heavy metals Titanium, Manganese, Iron, Zinc, Strontium and Zirconium across the highway were determined and the status of soil health due to traffic activity is presented. © 2015, Rasayan Journal of Chemistry, c/o Dr. Pratima Sharma. All rights reserved.

Vijaya S.,Government First Grade College | Vasu,Vivekananda Degree College | Gowda K.V.A.,Government First Grade College | Narasimhamurthy T.,Indian Institute of Science | Rathore R.S.,University of Hyderabad
Acta Crystallographica Section E: Structure Reports Online | Year: 2011

The title compound, C 18H 16ClN 3S, adopts an extended mol-ecular structure. The thia-zole ring is inclined by 9.2 (1) and 15.3 (1)° with respect to the chloro-phenyl and 4-(Dimethylamino)-phenyl rings, respectively, while the benzene ring planes make an angle of 19.0 (1)°. A weak Intermolecular C - H⋯π contact is observed in the crystal structure.

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