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EPR of irradiation induced Centers in Some VitreousMatrices Containing Copper

Journal of Materials Science & Technology 1995年第4期11卷 299-303页

作者： M.Peteanu l.cociu and i.ardelean (Faculty of Physics, Babes-Bolyai University, 3400 Cluj-Napoca, Romania) Babes-Bolyai Univ Cluj-Napoca Romania

Boro-germanate glasses containing copper, i.e., xCuO(1-x)[GeO2·B2O3] subjected to gamma irradiation, were studied by means of EPR. Comparisons were made with the xCuO·(1-x)[Na2B4O7] system. irradiation induced centers were detected. These are: electron trapped at a hydrogen compensated germanium ion centers; boron oxygen hole centers and electron trapped at an oxygen vacancy centers. Strong dependence of the paramagnetic irradiation-induced centers concentration on the CuO content of the sample was evidenced.

关键词： EPR of irradiation induced Centers in Some VitreousMatrices Containing Copper

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EPR Study of Borax-glasses with Addition of Fe^(3+) ions

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Journal of Materials Science & Technology 1994年第2期10卷 97-106页

作者： M.Peteanu l. cociu and i. ardelean (Dept. of Physics, University of Cluj-Napoca, Str. M.Kogalniceanu No. 1, 3400 Cluj-Napoca, Romania)(To whom correspondence should be addressed) Univ of Cluj-Napoca Cluj-Napoca Romania

Glasses of xFe2O3 (l-x) Na2B4O7 for 0.3≤x≤5 mol% have been studied by means of EPR. The distribution of Fe3+ ions in the vitreous network. as isolated and connected in clusters. depends on the impurity contents in the glass. A thermal treatment inducing the Fe3+ -rich phase separation ends at the sample crystallization, when performed at about 550℃, Weathering of glasses causes a Superficial alteration of their optical properties. it enters the bulk of the glass for powdered samples. As a result of gamma irradiation pararnagnetic hole centers were detected:the BOHC. the peroxy radical and the iron hole centers

关键词： Fe ions EPR Study of Borax-glasses with Addition of Fe

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The influence of antropic pollution on aquatic ecosystems in the main hydrographic pools from the western part of Romania

The influence of antropic pollution on aquatic ecosystems in...

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第三世界生态高峰会

作者： A.ardelean V.Turcus l.Floca i.Stana C.Sandu J.Bloesch “Vasile Goldis” Western University.Arad Romania “Vasile Goldis” Western University.Arad Romania “Vasile Goldis” Western University.Arad Romania “Vasile Goldis” Western University.Arad Romania National Biology institute Bucharest.Romania. iAD Austria

*** river has a length of 766 kin,gathering water from an area of 29767 km and traverses the land of two countries （Romania and Hungary）.During time some populated places have developed,come of these becoming important industrial centers. Ecologic conditions of this river have an economic importance and its value is significant if we consider all potential natural *** the fact that it bonds two neighbouring countries the environmental problems of this river become not only national but also international. *** purpose of this study was to investigate the degree of pollution of Mures river and it's affluents and some investigations on aquatic *** this study it was chosed a sector of Mutes' inferior course,between km 586 and *** order to include the pollutants of the affluents and the impact of a city with numerous population,the prelevation points were selected from upstream and downstream of *** and *** sites along the downstream part of River Mures,Romania,were investigated by limnochemistry and community analysis(microorganisms,plankton,

关键词： The influence of antropic pollution on aquatic ecosystems in the main hydrographic pools from the western part of Romania western

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