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Tirupati, India

Kiran N.,Sv University
Journal of Molecular Structure | Year: 2014

Sodium-lead borophosphate glasses doped with different concentrations of Eu3+ ion are prepared by using the melt quenching technique to study their physical, XRD FTIR and luminescence properties to understand the lasing potentialities of these glasses. The XRD studies confirm the amorphous nature of the glasses. FTIR spectrum indicates the presence of BO3 and PO 4 structural units. From the emission spectra, Judd-Ofelt (J-O) intensity parameters have been evaluated from the transition 5D 0 → 7FJ (J = 2 and 4). The evaluated (J-O) intensity parameters have been used to calculate the radiative transition probabilities, luminescence branching ratio and radiative decay times. The intensity ratio (R) value due to 5D0 → 7F2/5D0 → 7F 1 transition intensity of Eu3+ ions, increase with increasing concentrations suggesting higher asymmetry and covalent bonding character between rare earth ion and oxygen ligands. The chromaticity coordinates were calculated and analyzed with Commission International deI'Eclairage color diagram. The lifetimes of 5D0 metastable state for the samples with different concentrations were also measured and discussed. The predicted and experimental lifetimes for the 5D0 level in sodium lead borophosphate glasses were compared and discussed in detail. © 2014 Elsevier B.V. All rights reserved. Source


Kahleel Basha S.,Osmania college | Sudarshanam G.,Sv University
International Journal of Phytomedicine | Year: 2010

In India, the use of different parts of several medicinal plants to cure specific ailments has been practiced since ancient times. Ehanobotanical studies were carried out to collect information on the use of medicinal plants by the tribal community (Sugalis) who live in the forests of Yerramalais of Kurnool district, Andhra Pradesh, India. The present paper deals with identification of 40 medicinal plants, with local names used by Sugalis for different diseases. The information about different types of medicinal plants used by them for various diseases recorded orally by interviewing the elders, Vaidyas (doctors) of that tribe by visiting their habitats called Thandas. Collected plants are stored in the Departmental Herbarium of Osmania College, Kurnool. Most of the medicinal plants are taken in as roots, tubers, stem and leaves, are taken orally with or without combination of other plants, external applications like paste, fumigation. Most of plants used by them are Herbs (42%), shrubs (20%), Trees (33%).and Climbers (5%) The most striking feature of tribal life is their simplicity. The forest is able to provide them with everything. Professionally they are peasants, food-gatherers, hunters, small farmers, and, nomads. Sugalis use medicinal plants mainly for viral fevers, skin deceases, snake & scorpion bites and stomach problems. It is observed that the urban educated people are more aware of good effects of herbal medicine over allopathic medicine than the rural people. Due to the degraded forests and depleted resources, they are migrating to urban areas for livelihood. So there is a danger of losing knowledge of medicinal plants for human welfare. Hence there is an urgent need to document and popularize the value of herbal medicine among the rural people through Vana Samrakhak Samithi and other agencies. © arjournals.org, All rights reserved. Source


Sandeep N.,Vellore Institute of Technology | Sugunamma V.,Sv University
Journal of Applied Fluid Mechanics | Year: 2014

We analyse the effects of radiation and rotation on unsteady hydromagnetic free convection flow of a viscous incompressible electrically conducting fluid past an impulsively moving vertical plate in a porous medium by applying inclined magnetic field, Under Boussinesq approximation, assuming that the temperature of the plate has a temporarily ramped profile. An exact solution of the governing equations, in dimensionless form is obtained by Laplace transform technique. To compare the results obtained in this case with that of isothermal plate and exact solution of the governing equations are also obtained for isothermal plate and results are discussed graphically in both ramped temperature and isothermal cases. Source


Gowrisankar M.,Jkc College | Venkateswarlu P.,Sv University | Siva Kumar K.,P.A. College | Sivarambabu S.,Acharya Nagarjuna University
Journal of Industrial and Engineering Chemistry | Year: 2014

Measurement of densities (ρ), ultrasonic sound speeds (u) and viscosities (η) has been carried out for binary mixtures of N,N-dimethylaniline (N,N-DMA) with acetone(AC), methylethylketone (MEK), methylpropylketone (MPK), diethylketone (DEK), methylisobutylketone (MIBK), acetophenone (AP), cyclopentanone (CP), cyclohexanone (CH) and 2-methylcyclohexanone (MeCH) and their pure liquids at (303.15K and 308.15)K over the entire composition range. These experimental data have been used to calculate the excess molar volume (VE), deviation in ultrasonic sound velocity (δu), deviation in isentropic compressibility (δκs) and deviation in viscosity (δη) were evaluated. The variation of these properties with composition of the mixtures suggests dipole-dipole interactions and charge transfer complex formation between N,N-dimethylaniline and ketones. The magnitude of the property is found to depend on the chain length of the ketones molecule. These results have been fitted to the Redlich-Kister polynomial equation. The viscosity data have been correlated using three equations; Grunberg and Nissan, Katti and Chaudhri, Hind et al. for the system studied. © 2013 The Korean Society of Industrial and Engineering Chemistry. Source


Basha D.C.,Sv University | Rani M.U.,Sv University | Devi C.B.,P.A. College | Kumar M.R.,Sv University | Reddy G.R.,Sv University
International Journal of Developmental Neuroscience | Year: 2012

Our earlier studies indicated the role of neurotransmitter systems in lead (Pb) induced behavioral perturbations. In this study, we examined the alterations in synaptosomal acetylcholine (ACh), epinephrine, dopamine, acetylcholinesterase (AChE), and mitochondrial monoamine oxidase (MAO) in the cerebellum and hippocampus of perinatally Pb-exposed rats. Rats (Wistar) were exposed to 0.2% Pb (Pb acetate in drinking water of mother) from gestational day 6 and the pups were exposed lactationally (through mother's milk) to Pb till weaning (postnatal day 21). Studies conducted on different postnatal days (PND 21, 28, 35 and 60) showed significant decreases in synaptosomal AChE and mitochondrial MAO activities, and increases in the levels of ACh, dopamine and epinephrine in the cerebellum and hippocampus of Pb-exposed rats. These alterations were greater at PND 35 and more pronounced in the cholinergic system (ACh and AChE) of hippocampus and the aminergic system (epinephrine, dopamine and MAO) of cerebellum. The total locomotor activity and exploratory behavior were also decreased significantly in Pb-exposed animals corresponding to the alterations observed in cholinergic and aminergic systems. Calcium administration together with Pb, however significantly reversed the Pb-induced alterations in transmitters and enzymes, as well as exploratory and motor behavior suggesting protective effect of calcium in Pb-exposed animals. © 2012 ISDN. Source

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