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Search Results: 1 - 10 of 1139 matches for " Sonja Lojen "
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Ce anomaly at the Permian-Triassic boundary in the Idrijca Valley as evidence of changing redox conditions at the P/Tr transition in the western Tethys (Slovenia)
Tadej Dolenec,Sonja Lojen
Geologija , 2000,
Abstract:
Sulfur Cycling and the Sulfurization of Humic and Fulvic Acids in the Sediments of the rivers Rupel (Belgium) and Authie (northern France)
Sonja Lojen , Branko ermelj , Michel Wartel
Oceanological and Hydrobiological Studies , 2007, DOI: 10.2478/v10009-007-0008-3
Abstract: Sulfur cycling and the sulfurization of humic and fulvic acids were compared in recent sediments from two western European rivers (the heavily polluted River Rupel in Belgium and the pristine River Authie in northern France). The sulfurization of humic and fulvic substrates occurs in both sediments irrespective of organic loading, but the sulfur species added to the organic substrate differ. Some sulphurization of fulvic acid by oxidized S was observed in the strongly reducing sediment of the River Rupel. Humic acids were sulfurized in the sediments of both rivers in these segments with prevailing reducing conditions by reduced S.
The Permian-Triassic boundary in the Idrijca Valley (Western Slovenia): isotopic fraction between carbonate and organic carbon at P/Tr transition
Tadej Dolenec,Sonja Lojen,Matej Dolenec
Geologija , 1999,
Abstract:
The Paleocene-Eocene boundary in a flysch sequence from Gori ka Brda (Western Slovenia): Oxygen and carbon stable isotope variations
Tadej Dolenec,Jernej Pav?i?,Sonja Lojen
Geologija , 2000,
Abstract:
The influence of the microstructure of high noble gold-platinum dental alloys on their corrosion and biocompatibility in vitro
M. Colic,D. Stamenkovic,I. Anzel,G. Lojen,R. Rudolf
Gold Bulletin , 2009, DOI: 10.1007/BF03214904
Abstract: The aim of this work was to compare the microstructures of two high noble experimental Au-Pt alloys with similar composition with their corrosion and biocompatibility in vitro. We showed that Au-Pt II alloy, composed of 87.3 wt.% Au, 9.9 wt.% Pt, 1.7 wt.% Zn and 0.5 wt.% Ir + Rh + In, although possessing better mechanical properties than the Au-Pt I alloy (86.9 wt.% Au, 10.4 wt.% Pt, 1.5 wt.% Zn and 0.5 wt.% Ir + Rh + In), exerted higher adverse effects on the viability of L929 cells and the suppression of rat thymocyte functions, such as proliferation activity, the production of Interleukin-2 (IL-2), expression of IL-2 receptor and activation — induced apoptosis after stimulation of the cells with Concanavalin-A. These results correlated with the higher release of Zn ions in the culture medium. As Zn2+, at the concentrations which were detected in the alloy’s culture media, showed a lesser cytotoxic effect than the Au-Pt conditioning media, we concluded that Zn is probably not the only element responsible for alloy cytotoxicity. Microstructural characterization of the alloys, performed by means of scanning electron microscopy in addition to energy dispersive X-ray and X-ray diffraction analyses, showed that Au-Pt I is a two-phase alloy containing a dominant Au-rich α1 phase and a minor Pt-rich α2 phase. On the other hand, the Au-Pt II alloy additionally contained three minor phases: AuZn3, Pt3Zn and Au1.4Zn0.52. The highest content of Zn was identified in the Pt3Zn phase. After conditioning, the Pt3Zn and AuZn3 phases disappeared, suggesting that they are predominantly responsible for Zn loss, lower corrosion stability and subsequent lower biocompatibility of the Au-Pt II alloy.
Comparison of percentage of wood fracture surface analyzed by computer and by ISO 6238 in determining the quality of adhesive bonds
Alica Lojen,Goran Mihulja,Ivica ?up?i?,Andrija Bogner
Drvna Industrija , 2009,
Abstract: This paper presents the results of measuring and estimating the percentage of wood fracture surface in testing the quality of adhesive bonds by using two methods. The first method is based on ISO 6238. The estimation was carried out by two estimators so as to show the difference in perception. The second method consists of measuring the percentage of wood fracture surface by analyzing digital photography by computer software. The results prove that there is no statistically significant difference between the measurement of the percentage of fracture surface by analyzing digital photography with computer software and the measurement made by standard process. Computer measurement is, however, more reliable and accurate
Inverse Problems for Difference Equations with Quadratic Eigenparameter Dependent Boundary Conditions-II  [PDF]
Sonja Currie, Anne Love
Advances in Pure Mathematics (APM) , 2016, DOI: 10.4236/apm.2016.610051
Abstract: The following inverse problem is solved—given the eigenvalues and the potential b(n) for a difference boundary value problem with quadratic dependence on the eigenparameter, λ, the weights c(n)?can be uniquely reconstructed. The investi-gation is inductive on m where represents the number of unit intervals and the results obtained depend on the specific form of the given boundary conditions. This paper is a sequel to [1] which provided an algorithm for the solution of an analogous inverse problem, where the eigenvalues and weights were given and the potential was uniquely reconstructed. Since the inverse problem considered in this paper contains more unknowns than the inverse problem considered in [1], an additional spectrum is required more often than was the case in [1].
Competition of Intermediaries in a Differentiated Duopoly  [PDF]
Sonja Brangewitz, Jochen Manegold
Theoretical Economics Letters (TEL) , 2016, DOI: 10.4236/tel.2016.66124
Abstract: On an intermediate goods market with asymmetric production technologies as well as vertical and horizontal product differentiation, we analyze the influence of simultaneous competition for resources and customers. The intermediaries face either price or quantity competition on the output market and a monopolistic, strategically acting supplier on the input market. We find that there exist quality and productivity differences such that for quantity competition only one intermediary is willing to procure inputs from the input supplier, while for price competition both intermediaries are willing to purchase inputs. Moreover, the well-known welfare advantage of price competition can in general be no longer confirmed in our model with an endogenous input market and asymmetric intermediaries.
Lorenz Curves, Size Classification, and Dimensions of Bubble Size Distributions
Sonja Sauerbrei
Entropy , 2010, DOI: 10.3390/e12010001
Abstract: Lorenz curves of bubble size distributions and their Gini coefficients characterize demixing processes. Through a systematic size classification, bubble size histograms are generated and investigated concerning their statistical entropy. It turns out that the temporal development of the entropy is preserved although characteristics of the histograms like number of size classes and modality are remarkably reduced. Examinations by Rényi dimensions show that the bubble size distributions are multifractal and provide information about the underlying structures like self-similarity.
A blueprint for democratic citizenship education in South African public schools: African teachers' perceptions of good citizenship
Sonja Schoeman
South African Journal of Education , 2006,
Abstract:
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