Výsledky vyhledávání

Distribution of the persistent organic pollutants, polycyclic aromatic hydrocarbons, between water, sediments and biota

Autor: E. Urbas, Uuve Kirso, M. Voll, Natalya Irha, L. Paalme

Publikováno v: Aquatic Ecosystem Health & Management. 4:151-163

Polycyclic aromatic compounds continue to be regarded as a major environmental threat, especially in the aquatic environment. To gather further information on the distribution and levels of these persistent organic compound in natural waters, the cur

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::e799ce41d079100d873b19374735550f
https://doi.org/10.1080/14634980127705

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Improvement of the performance of single-column ion chromatography by computerized detector signal processing and correlation chromatography

Autor: Mihkel Kaljurand, E. Urbas, Ülo Haldna

Publikováno v: Journal of Chromatography A. 660:147-152

The performance of medium-quality ion chromatographic equipment was improved by using pseudo-random sample intoduction correlation chromatography (CC). The importance of the digital preprocessing of the detector signal prior to decorrelation was demo

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b7f87188be11f9f22e7a477949df8118
https://doi.org/10.1016/0021-9673(94)85108-5

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Correlation ion chromatography with indirect UV detection

Autor: Mihkel Kaljurand, E. Urbas, U. Haldna

Publikováno v: Chromatographia. 34:417-420

A binary pseudo-random injection of a sample containing low concentrations of common anions into the anion exchange column was used to enhance the signal-to-noise ratio of indirect UV detection of the ions. The detection limits obtained in our experi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::35aed5a8df7d61358b48e188202665ee
https://doi.org/10.1007/bf02268377

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Boundary regularity for solutions of the equation of prescribed Gauss curvature

Autor: John L. E. Urbas

Publikováno v: Theoretical and Numerical Aspects of Geometric Variational Problems. Gerd Dziuk, Gerhard Huisken, and John Hutchinson, eds. Proceedings of the Centre for Mathematics and its Applications, v. 26. (Canberra AUS: Centre for Mathematics and its Applications, Mathematical Sciences Institute, The Australian National University, 1991)

We study the boundary regularity of convex solutions of the equation of prescribed Gauss curvature in a domain Ω ⊂ ℝn in the case that the gradient of the solution is infinite on some relatively open, uniformly convex portion Γ of ∂Ω. Under

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::31039bb437c776c7fcf389926277c363
https://doi.org/10.1016/s0294-1449(16)30259-1

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Model studies of photochemical oxidation of carcinogenic polyaromatic hydrocarbons

Autor: E. Urbas, L. Paalme, N. Irha, A Tsyban, U. Kirso

Publikováno v: Marine Chemistry. 30:105-111

Twenty-eight different polyaromatic hydrocarbons (PAHs) in water and on thin-layer plates with Al2O3 or SiO2 have been irradiated, using high-pressure mercury-quartz lamps. The degradation rates differ by two orders of magnitude, and the process is m

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::480e4a79a39fba3d873864f7db5b0a24
https://doi.org/10.1016/0304-4203(90)90064-j

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Accumulation of carcinogenic hydrocarbons at the sediment-water interface

Autor: E. Urbas, N. Irha, L. Paalme, M. Voll, U. Kirso

Publikováno v: Marine Chemistry. 30:337-341

Polyaromatic hydrocarbons (PAHs) were determined at different depths, at the sediment-water interface, in sediments and in benthic algae at stations in the Gotland Deep and the Gulf of Finland. Pyrene is the main PAH in the water and the algae, where

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::7d865e08d3c5d728fca9800e7e60f9cc
https://doi.org/10.1016/0304-4203(90)90079-r

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