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Amplitude Factorization Method in the Atmospheric Gravity-Wave Equation

Communications in Computational Physics 2007年第5期2卷 993-1006页

作者： Rein Room Marko Zirk Institute of Environmental Physics Tartu UniversityUlikooli 18Tartu 50090Estonia.

A novel amplitude factorization method is applied to solve a discrete buoyancy wave equation with arbitrary wind and temperature height *** solution is given in the form of a cumulative product of complex factors,which are computed by a nonlinear,inhomogeneous,two-member recurrence formula,initiated from a radiative condition on *** of the wave equation due to evanescent winds are eliminated by turbulent *** method provides an estimation of the minimal vertical resolution,required to attain a stable accurate *** areas of application of the developed numerical scheme are high resolution modelling of orographic waves for arbitrary orography in general atmospheric stratification conditions,and testing of adiabatic kernels of numerical weather prediction models.

关键词： Atmospheric gravity waves linear buoyancy wave equation arbitrary stratification numerical solution amplitude factorization method.

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Photochemical degradation of nonylphenol in aqueous solution: The impact of pH and hydroxyl radical promoters

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Journal of Environmental sciences 2013年第7期25卷 1326-1330页

作者： Aleksandr Dulov Niina Dulova Marina Trapido Department of Chemical Engineering Tallinn University of Technology

The degradation of nonylphenol （NP） in aqueous solution with UV, H202/UV, and Fenton/photo-Fenton processes was studied. The efficacy of direct and hydrogen peroxide photolysis proved to be dependent on the pH value. The addition of H202 to UV treatment improved NP degradation. The application of UV photolysis and the H202/UV system at pH 7 resulted in low pseudo first-order rate constants at 104 sec1 . In the experiments at elevated pH values the pseudo-first order rate constants increased to 103 sec1 . The efficacy of the Fenton process was lower in comparison with UV and hydrogen peroxide photolysis. The addition of UV irradiation to the H202/Fe2＋ system substantially improved NP degradation efficacy. In terms of performance, the photo-Fenton process was similar to the H202/UV process. The most favourable process for complete nonylphenol degradation considering both operational cost and treatment efficacy was H202/UV at pH 11 and 250 μmol/L H202 .

关键词： AOPs endocrine disrupting compound photo-Fenton process photolysis UVC radiation

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Spectroscopic properties of Eu^(3+) doped YBO_3 nanophosphors synthesized by modified co-precipitation method

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Journal of Rare Earths 2011年第12期29卷 1142-1146页

作者： A.Szczeszak S.Lis V.Nagirnyi Department of Rare Earths Faculty of ChemistryAdam Mickiewicz University Institute of Physics University of Tartu

Y1-xEuxBO3 nanophosphors were synthesized by a modified co-precipitation method. The structure of the obtained nanocrystals was determined by X-ray diffraction （XRD） and transmission electron microscopy （TEM）. The average crystallite size was calculated from the full-width at half-maximum （FWHM） of the diffraction peaks by the Scherrer equation. The average particles size was 25±10 nm. The spectroscopic properties of the Y1-xEuxBO3 nanoborates were characterized by excitation and emission spectra under UV and VUV excitation. In order to improve colour purity, the chromaticity coordinates were also calculated.

关键词： YBO3:Eu^3+ co-precipitation nanophosphor luminescence VUV rare earths

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