341. Stabilization of river dredged sediments by means of alkali activation technologyKarmen Fifer Bizjak, Lea Žibret, Mojca Božič, Boštjan Gregorc, Vilma Ducman, 2024, original scientific article Abstract: Purpose
Alkali activation process has been applied to fresh river clay-rich sediments in order to increase their mechanical properties and make them suitable for soil stabilization.
Materials and methods
Dredged sediments were mixed with up to 30 mass percent (ma%) of fly ash (FA) or ladle slag (LS) and after curing for 3 days at 60 °C, the bending and compressive strength have been determined. The mixtures which exhibited the highest strengths were further optimized for being used in soil stabilization. For this purpose, the sediment was stabilized with 4 ma% of quicklime (QL) and after 1 h 30 ma% of FA with alkali activator was added and cured for 1, 7 and 28 days.
Results
The stabilized sediment has a significantely better geomechanical performance in comparison with the sediment alone. Stabilizing the dredged sediment using alkali activation technology provides high enough strengths to eventually make it suitable for anti-flood embankments.
Conclusions
The results confirmed the suitability of the investigated technology for soil stabilization.
Keywords: river sediment, alkali activated materials, ladle slag, fly ash, mechanical strength, soil stabilization
Published in DiRROS: 09.09.2024; Views: 220; Downloads: 4658
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344. UVB radiation as a potential selective factor favoring microcystin producing bloom forming cyanobacteriaYi Ding, Lirong Song, Bojan Sedmak, 2013, original scientific article Abstract: Due to the stratospheric ozone depletion, several organisms will become exposed to increased biologically active UVB (280-320 nm) radiation, not only at polar but also at temperate and tropical latitudes. Bloom forming cyanobacteria are exposed to UVB radiation on a mass scale, particularly during the surface bloom and scum formation that can persist for long periods of time. All buoyant species of cyanobacteria are at least periodically exposed to higher irradiation during their vertical migration to the surface that usually occurs several times a day. The aim of this study is to assess the influence on cyanobacteria of UVB radiation at realistic environmental intensities. The effects of two UVB intensities of 0.5 and 0.99 W/m2 in up to 0.5 cm water depth were studied in vitro on Microcystis aeruginosa strains, two microcystin producing and one non-producing. After UVB exposure their ability to proliferate was estimated by cell counting, while cell fitness and integrity were evaluated using light microscopy, autofluorescence and immunofluorescence. Gene damage was assessed by TUNEL assay and SYBR Green staining of the nucleoide area. We conclude that UVB exposure causes damage tothe genetic material, cytoskeletal elements, higher sedimentation rates and consequent cell death. In contrast to microcystin producers (PCC7806 and FACHB905), the microcystin non-producing strain PCC7005 is more susceptible tothe deleterious effects of radiation, with weak recovery ability. The ecological relevance of the results is discussed using data from eleven yearsʼcontinuous UVB radiation measurements within the area of Ljubljana city (Slovenia, Central Europe). Our results suggest that increased solar radiationin temperate latitudes can have its strongest effect during cyanobacterial bloom formation in spring and early summer. UVB radiation in this period may significantly influence strain composition of cyanobacterial blooms in favor of microcystin producers.
Keywords: microcystin, cyanobacteria
Published in DiRROS: 06.09.2024; Views: 208; Downloads: 84
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345. Report of the JRCʹs Descriptor 1 workshop to support the review of the Commission Decision 2010/477/EU concerning MSFD criteria for assessing Good Environmental Status : JRC technical reportsL. Avellan, Borut Mavrič, Martina Orlando-Bonaca, 2016, final research report Abstract: The MSFD workshop on biodiversity (MSFD D1), held in Ispra JRC (7th-9th of September 2015) aimed to provide clear proposals and conclusions on some of the outstanding issues identified in the D1 review process and included in the review manual (D1 review version, May 2015: https://circabc.europa.eu/w/browse/46d2b7ba-d2fd-4b3c-9eaf-18c7cb702b53) in support to the review of Commission Decision 2010/477/EU. This report is complementing the Commission Decision 2010/477/EU review manual (JRC96521) and presents the result of the scientific and technical review concluding phase 1 of the review of the Commission Decision 2010/477/EU in relation to Descriptor 1. The review has been carried out by the EC JRC together with experts nominated by EU Member States, and has considered contributions from the GES Working Group in accordance with the roadmap set out in the MSFD implementation strategy (agreed on at the 11th CIS MSCG meeting).
Published in DiRROS: 06.09.2024; Views: 166; Downloads: 1331
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346. Environmental Quality in the Adriatic Ionian Region. Threat to Coastal and Marine Biodiversity : overview and Case Study for IPA Adriatic Balmas and Speedy ProjectsBranko Čermelj, Martina Orlando-Bonaca, Ana Rotter, Boris Petelin, 2016, final research report Abstract: The Environmental Quality is the third thematic pillar of the EU Strategy for the Adriatic and Ionian Region (EUSAIR). The coordinators are Slovenia and Bosnia Herzegovina. The specific objectives of this pillar(EC 2014) (EC, 2014) are:
• to ensure a good ecological and environmental status of the coastal and marine environment by 2020 in line with the relevant EU directives (principally Water Framework Directive (WFD) and Marine Strategy Framework Directive (MSFD)) and the ecosystem approach of the Barcelona Convention;
• to contribute to the goal of the EU Biodiversity Strategy to halt the loss of biodiversity and the degradation of ecosystem services in the EU by 2020, and restore them in so far as feasible, by addressing threats to marine and terrestrial biodiversity; and
• to improve waste management by reducing waste flows to the sea, and to reduce nutrient flows and other pollutants to the rivers and the sea.
Published in DiRROS: 06.09.2024; Views: 194; Downloads: 3971
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347. Parenteralna prehrana na domu po onkološkem zdravljenju ginekoloških rakovNada Rotovnik-Kozjek, Mia Majerr, Nizra Palamar, Laura Petrica, Tatjana Slapar, Gregor Vivod, Denis Mlakar-Mastnak, 2024, published scientific conference contribution Keywords: ginekološki raki, parenteralna prehrana, raki rodil
Published in DiRROS: 06.09.2024; Views: 206; Downloads: 78
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