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Devender Singh,Vijeta Tanwar,Anura Priyajith Samantilleke,Bernabe Mari,Shri Bhagwan,Krishan Chander Singh,Pratap Singh Kadyan,Ishwar Singh 대한금속·재료학회 2017 ELECTRONIC MATERIALS LETTERS Vol.13 No.3
Eu2+ and Eu2++Ln3+ doped SrAl4O7 nanophosphors were synthesized byrapid gel combustion process. The morphology of prepared phosphorswas examined with scanning and transmission electron microscopy. The phase identification and the crystal structures of nanophosphorswere studied using X-ray powder diffraction techniques. Luminescencecharacteristics of the prepared nanophosphors were analyzed on accountof excitation, emission and phosphorescence decay analysis. Theemission spectra demonstrated the broad green emission attributed to4f65d1→ 4f7 transition of the Eu2+ ions. The effect of codoping of sometrivalent lanthanide (Dy3+, Pr3+ and Y3+) ions were investigated forimproving the emission intensity and phosphorescence decay time ofthe basic lattice of SrAl4O7:Eu2+ phosphors. The synthesized materialshad enhanced bright luminescent properties that could suitably beapplied for display as well as photovoltaic applications.
Excess Gibbs free energy of butyl acetate with cyclohexane and aromatic hydrocarbons at 308.15K
Sanjeev Maken,Naveen Verma,Krishan Chander Singh,Ankur Gaur,Ho-Jun Song,박진원 한국화학공학회 2008 Korean Journal of Chemical Engineering Vol.25 No.2
Molar excess Gibbs free energies of mixing (CE) for butyl acetate+cyclohexane or benzene or toluene or o- or m- or p-xylene were calculated by using Barker’s method from the measured vapor pressure data by static method at 308.15±0.01 K over the entire composition range. The GE values for the binary mixtures containing cyclohexane or benzene are positive; while these are negative for toluene, o-, m- and p-xylene system over the whole composition range. The GE values of an equimolar mixture for these systems vary in the order: cyclohexane>benzene>o-xylene> m-xylene>p-xylene>toluene. The GE values for these systems were also calculated by Sanchez and Lacome theory using the previously published excess enthalpy and excess volume data. It is found that while values of GE from Sanchez and Lacombe theory are in reasonably good agreement with those calculated by Barker method for m-xylene and pxylene mixtures, agreement is very poor for other systems although they predict the sign of GE data except in the case of mixtures containing benzene