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Functions with closed Graph and some other related Properties
Chae, Gyu-Ihn,Singh,V.P.,Misra,D.N. 울산대학교 1986 연구논문집 Vol.17 No.1
P.E. Long은 폐그래프를 갖는 함수를 도입했었다. 우리는 그 함수를 근사 개 함수를 이용하여 그 성질을 연구한다. P.E. Long introduced a function with closed graph. We will investigate the function with closed graph by means of nearly open mappings due to V.P. Singh and study its characterizations.
Vijay Kumar,Ravi Kumar Gundampati,Devendra Kumar Singh,Medicherla V. Jagannadham,Shyam Sundar,Syed Hadi Hasan 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.37 No.-
The current work describes the biosynthesis of stable AgNPs using aqueous extract of Xanthiumstrumarium (AEX) which act as both reducing as well as a stabilizing agent. The biosynthesis wasconfirmed by UV–visible spectroscopy where the presence of SPR band at lmax 436 nm corresponded tothe existence of AgNPs in reaction mixture. The optimum conditions for biosynthesis of AgNPs were30 min of sunlight exposure time, 3.0% (v/v) of AEX inoculum dose and 3.5 mM AgNO3 concentration. The synthesized AgNPs was characterized by HRTEM, SAED, FESEM, EDX, XRD, AFM, and FTIR whichshowed potent antibacterial and antileishmanial activity.
Vibhav K. Saraswat,K. Singh,N.S. Saxena,V. Kishore,T.P. Sharma,P.K. Saraswat 한국물리학회 2006 Current Applied Physics Vol.6 No.1
Measurements ofIV characteristics and DC electrical conductivity of Se85. xTe15Sbx (wherex = 2, 4, 6, 8 and 10) glassy thinpellets, prepared by well established melt quenching technique in bulk (pellets of diameter 12mm and thickness. 1m were pre-pared under a constant load of 5 tons), have been carried out at room temperature using Keithley High Resistance Meter/Electrom-eter 6517A. For the recording ofIV characteristics, this equipment was used in FVMI (Force Voltage Measure Current) mode. It isIV characteristics that the glass containing 4 at. wt.% of Sb has the minimum resistance allowing maximumcurrent through the sample as compared to the other at. wt.% of Sb contents e.g. 2, 6, 8 and 10.At 4 at. wt.% of Sb, conductivityrises to 76% of the value obtained for 2 at. wt.% of Sb. Composition dependence of DC conductivity is discussed in terms of thebond formation between Se and Sb at dierent compositions. The conduction mechanism is discussed qualitatively on the basisof PooleFrenkel conduction mechanism. Also the linear relation between ln (I) and V1/2veries that the conduction mechanismis of PooleFrenkel type for both low and high voltage range. The deviation of ohmic behaviour at lower voltage range towardsthe non-ohmic at higher voltage range is due to the high voltage induced temperature eects in the sample.
Eu2+ and Mn2+ Co-doped BaMgAl10O17 Blue- and Green-Emitting Phosphor: A Luminescence and EPR Study
Singh, V.,Sivaramaiah, G.,Rao, J. L.,Singh, N.,Srivastava, A. K.,Jirimali, H. D.,Li, J.,Gao, H.,Kumaran, R. S.,Singh, P. K. Springer Science + Business Media 2016 Journal of electronic materials Vol.45 No.6
<P>Eu2+ and Mn2+ co-doped BaMgAl10O17 phosphor has been prepared by a solution combustion method. The structural, morphological and compositional analysis of the BaMgAl10O17:Eu2+ and Mn2+ powders have been studied by x-ray diffraction, scanning electron microscopy and energy dispersive x-ray spectroscopy. The electron paramagnetic resonance (EPR) spectrum exhibited resonance signals with the effective g values of g a parts per thousand 4.88 and g a parts per thousand 1.98. The resonance signal with the effective g value of g a parts per thousand 4.88 is characteristic of Eu2+ ions whereas g a parts per thousand 1.98 is due to Mn2+ ions. The number of spins participating in resonance, Gibbs free energy, magnetic susceptibility, Curie constant, effective magnetic moment, zero-field splitting parameter and hyperfine splitting constant have been evaluated. From optical and EPR correlation, it is inferred that Eu2+ and Mn2+ are present in the BaMgAl10O17 matrix.</P>
Cr3+-Doped Yb3Ga5O12 Nanophosphor: Synthesis, Optical, EPR, Studies
Singh, V.,Sivaramaiah, G.,Rao, J. L.,Singh, N.,Pathak, M. S.,Jirimali, H. D.,Singh, P. K.,Srivastava, A. K.,Dhoble, S. J.,Mohapatra, M. Springer Science + Business Media 2016 Journal of electronic materials Vol.45 No.8
<P>Gallium garnets of lanthanides are multifunctional materials especially known for their complicated structure and magnetic properties. In addition, with a suitable transition metal dopant ion, these matrices have been proved to be excellent materials for lasers. In particular, gallium garnet of ytterbium (Yb3Ga5O12) is known to possess excellent properties with regards to these applications. In this connection, Yb3Ga5O12 doped with Cr3+ nanophosphors were synthesized by a solution combustion route. The synthesized material was characterized by powder x-ray diffraction and scanning electron microscopy for phase purity and homogenous morphology. In order to ascertain the oxidation state of the doped ion, diffuse reflectance (DRF), photoluminescence (PL) and electron paramagnetic resonance (EPR) experiments were performed on the sample. The DRF and PL data suggested the stabilisation of the trivalent Cr ion in the matrix. The EPR spectra exhibited two resonance signals with effective g values at g approximate to 7.6 and 4. The EPR data corroborated the DRF and PL results, suggesting the stabilisation of Cr3+ in the matrix at octahedral-type geometries.</P>
Singh, N.,Singh, V.,Sivaramaiah, G.,Rao, J.L.,Singh, P.K.,Pathak, M.S.,Dhoble, S.J.,Mohapatra, M. Elsevier [etc.] 2016 Journal of luminescence Vol.178 No.-
<P>Strong blue-green light emitting MgSrAl10O17:Eu2+,Mn2+ phosphor was synthesized by a low temperature initiated, self-propagating and gas producing combustion process in a very short time (< 5 min). Structural characterization of the luminescent material was studied with X-ray diffraction analysis and energy-dispersive X-ray analysis. The absorption spectrum exhibits bands due to Eu2+ and Mn3+ ions. The excitation spectrum shows a peak at 337 nm. Upon excitation at 337 nm, the emission spectrum exhibits an intense band centered at 462 nm due to transitions from the 4f(6)5d(1) to the 4f(7) configuration of the Eu2+ ions, whereas sharp peak at 513 nm attributed to T-4(1) -> (6)A(1) transition of Mn2+ ions. The X-band EPR spectra of MgSrAl10O17:Eu2+,Mn2+ showed the presence of Eu2+ and Mn2+ ions. (C) 2016 Elsevier B.V. All rights reserved.</P>